JP2020047359A - Manufacturing method for electrode body - Google Patents

Abstract

To suppress occurrence of positional displacement from cutting a separator material on which an electrode is mounted to conveying the separator material to a position to pick it up.SOLUTION: A manufacturing method of an electrode body includes the steps of: bonding a cathode 12 to a long first separator material 11A; incising the first separator material 11A in a state where a region to be a first separator material 11 for one element to which the cathode 12 is bonded is enclosed while partially leaving a non-cut portion, at a first working position T1; conveying the first separator material 11A in such a manner that the region to be the first separator 11 to which the cathode 12 is bonded is located at a second working position T2; picking up the region to be the first separator 11 at the second working position T2, cutting the non-cut portion, and separating the first separator 11 to which the cathode 12 is bonded; and conveying the first separator 11 to which the cathode 12 is bonded to a lamination stage 25. The steps are performed on a second separator material and an anode 14 as well.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing an electrode body of a battery.

  BACKGROUND ART As a battery electrode body, an electrode body having a structure in which a plurality of positive electrodes and negative electrodes are alternately stacked with a separator interposed therebetween is known.

  As a method for manufacturing such an electrode body, Patent Literature 1 discloses that a long separator material, a long positive electrode material, a long separator material and a long negative electrode material are sequentially laminated, A method is described in which an electrode body is manufactured by cutting a plurality of unit structures obtained by cutting into a shape having the shape shown in FIG.

JP-T-2015-528629A

  However, in the method for manufacturing an electrode body described in Patent Document 1, in order to obtain a unit structure, a long separator material, a long positive electrode material, a long separator material, and a long Since the step of cutting the shaped negative electrode material and the step of picking up the cut unit structure to be conveyed to the stacking position are performed at different positions, the cut unit structure is conveyed to the pickup position. In some cases, misalignment may occur. When the unit structure is misaligned, the misalignment occurs even when the unit structures are stacked.

  The present invention has been made to solve the above-described problems, and is intended to provide an electrode body capable of suppressing a displacement from occurring after cutting a separator material on which an electrode is placed and before transporting the separator material to a pickup position. It is intended to provide a manufacturing method.

The method for producing an electrode body according to the present invention includes:
A method of manufacturing an electrode body including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
Bonding the positive electrode to a long first separator material;
In the first working position, based on the position of the positive electrode, while leaving an uncut portion in a part, surrounding the region serving as a first separator for one element to which the positive electrode is adhered, A step of making a cut in the separator material,
Cut the first separator material so that a region serving as the first separator for one element to which the positive electrode is adhered is located at a second work position different from the first work position. Transporting,
In the second working position, a region serving as the first separator for one element to which the positive electrode was bonded was picked up, the uncut portion was cut, and the positive electrode was bonded from the first separator material. Separating the first separator for one element;
Transporting the separated first separator for one element to which the positive electrode is adhered to a stacking stage;
Adhering the negative electrode to a long second separator material;
In the third working position, based on the position of the negative electrode, while leaving an uncut portion in a part, surrounding the region serving as a second separator for one element to which the negative electrode is adhered, A step of making a cut in the separator material,
The cut second separator material is cut such that a region serving as the second separator for one element to which the negative electrode is attached is located at a fourth work position different from the third work position. Transporting,
In the fourth working position, a region serving as the second separator for one element to which the negative electrode was bonded was picked up, the uncut portion was cut, and the negative electrode was bonded from the second separator material. Separating the second separator for one element;
Transporting the separated second separator for one element to which the negative electrode is adhered to the stacking stage;
Stacking the first separator for one element to which the positive electrode is attached, and the second separator for one element to which the negative electrode is attached, in the stacking stage;
It is characterized by having.

The notch of the first separator material, when transporting the notched first separator material, no displacement occurs in the region serving as the first separator for one element to which the positive electrode is adhered, And, when picking up a region serving as the first separator for one element to which the positive electrode is adhered, the uncut portion is cut in a manner to be cut,
The notch of the second separator material, when transporting the cut second separator material, no displacement occurs in the region serving as the second separator for one element to which the negative electrode is adhered, In addition, when picking up a region serving as the second separator for one element to which the negative electrode is bonded, the uncut portion can be cut off.

  The shape of the positive electrode and the shape of the negative electrode may be non-rectangular.

  According to the present invention, in the first working position, a cut is made in the first separator material while leaving an uncut part in a part, and the cut is transported to the second working position. Since the region serving as the first separator for the bonded one element is picked up and the uncut portion is cut, a displacement occurs when the region serving as the first separator for the one element to which the positive electrode is bonded is transported. Can be suppressed. Also, at the third working position, a cut was made in the second separator material while leaving an uncut portion at a part, and the cut was conveyed to the fourth working position. At the fourth working position, the negative electrode was bonded. Since the region serving as the second separator for the element is picked up and the uncut portion is cut, the occurrence of displacement when the region serving as the second separator for the one element to which the negative electrode is adhered is transported is suppressed. be able to. Thereby, it is possible to manufacture an electrode body in which the displacement between the positive electrode and the negative electrode is suppressed.

It is sectional drawing which shows the structure of an electrode body. It is a side view for explaining each process in a manufacturing method of an electrode object in a 1st embodiment. It is a top view for explaining the method of making a cut in the 1st separator material. It is a figure for explaining the method of adhering the whole of the 1st separator, the cathode, the 2nd separator, and the anode which were laminated.

  Hereinafter, embodiments of the present invention will be described, and features of the present invention will be described more specifically.

  First, the structure of the electrode body will be briefly described, and then a method of manufacturing the electrode body will be described.

  As shown in FIG. 1, the electrode body 10 has a structure in which a first separator 11, a positive electrode 12, a second separator 13, and a negative electrode 14 are laminated in order, and is used for a battery such as a lithium ion battery. .

  The positive electrode 12 includes a positive electrode current collector made of a metal foil such as aluminum, and a positive electrode active material formed on both surfaces of the positive electrode current collector. However, when the positive electrode exists on the outermost side in the stacking direction of the electrode body 10, the outermost positive electrode may have a configuration in which the positive electrode active material is formed only on one surface of the positive electrode current collector.

  The negative electrode 14 includes a negative electrode current collector made of a metal foil such as copper, and negative electrode active materials formed on both surfaces of the negative electrode current collector. However, when the negative electrode exists at the outermost side in the stacking direction of the electrode body 10, the outermost negative electrode may have a configuration in which the negative electrode active material is formed only on one surface of the negative electrode current collector.

  The first separator 11 and the second separator 13 can be made of the same material, and can be made of, for example, a microporous thin film made of polypropylene having excellent insulating properties.

  FIG. 2 is a side view for explaining each step in the method for manufacturing the electrode body 10 according to the first embodiment.

  In addition, in this specification, 11A is attached | subjected to the long 1st separator material before cutting | disconnection, and 11th code | symbol is attached | subjected to the 1st separator after cutting | disconnection, and it demonstrates.

  The long first separator material 11A is wound in a roll shape at the separator unwinding part 21, is unwound from the separator unwinding part 21, and is sent out in one direction. For example, the first separator material 11A is conveyed in one direction by stacking the long first separator material 11A on the long PET film and conveying the long PET film in one direction. I do.

  First, the positive electrode 12 is placed on the long first separator material 11A, and the positive electrode 12 is bonded to the first separator material 11A.

  Specifically, the positive electrode 12 prepared in advance is placed at a position at a predetermined distance H from one end S in the width direction of the long first separator material 11A. In this embodiment, one end S in the width direction of the first separator material 11A is an end on the side from which the positive electrode tab 12A protrudes when the positive electrode 12 is bonded, as shown in FIG.

  Then, the positive electrode 12 is sandwiched between the upper side and the lower side of the positive electrode 12 placed on the first separator material 11A by the bonding portion 22 having a built-in heater, and the positive electrode 12 is subjected to the first pressing by heating and pressing while heating. Adhere to the separator material 11A. In the present embodiment, as shown in FIG. 3, in a state where the positive electrode 12 is bonded to the first separator material 11A, the positive electrode tab 12A protrudes outside one end S of the first separator material 11A.

  In addition, the method of bonding the positive electrode 12 to the first separator material 11A is not limited to thermocompression bonding, and may be bonded by a method other than thermocompression bonding.

  Subsequently, at the first working position T1, the cutting mechanism 23 cuts the first separator material 11A based on the position of the positive electrode 12 while leaving an uncut portion.

  Specifically, the cutting mechanism unit 23 includes a camera (not shown). The camera captures an image of the first separator material 11A including the positive electrode 12, and based on the captured image, according to the position of the positive electrode 12, A cut 31 is made in the first separator material 11A by the cutting blade 23a.

  In this embodiment, as shown in FIG. 3, cuts 31 are made in the first separator material 11A at positions along the sides of the outer periphery of the positive electrode 12 other than the side where the positive electrode tab 12A is provided. . At this time, as described above, the cut 31 is made so that the uncut portion 35 which is an uncut portion remains so that the entire periphery of the positive electrode 12 is not cut off. That is, the cut 31 is a cut portion for the uncut portion 35 described above. FIG. 3 shows an example in which three uncut portions 35 are formed.

  Here, when the notch 31 is transported in a later step by the first separator material 11A with the notch 31, no displacement occurs between the region surrounded by the notch 31 and another region. In addition, when the region enclosed by the cuts 31 is picked up by the later-described positive electrode transfer head 24, the uncut portion 35 is cut, and the first separator 11 for one element is separated from the first separator material 11A. It is formed in such a manner that it can be reliably separated.

  The cutting blade 23a provided in the cutting mechanism 23 has a shape corresponding to the cut 31 which is the cut portion in FIG. 3 in plan view. By pressing the cutting blade 23a from above the first separator material 11A, the notch 31 can be made while leaving the uncut portion 35 as shown in FIG.

  The number of uncut portions 35 may be less than three, or may be four or more. It is preferable that the number of the uncut portions 35 is small so that the uncut portions 35 can be easily cut when separating or separating the uncut portions 35 in a later step. It is preferable that the length of 35 is short. However, when the number of the uncut portions 35 is reduced and when the length of the uncut portions 35 is shortened, the first separator 11A having the cuts 31 is conveyed later when the first separator 11A is transferred. May be displaced in the region where For this reason, the number and length of the uncut portions 35 are appropriately set in consideration of the ease of cutting and the prevention of misalignment at the time of transport of the first separator material 11A with the cuts 31. There is a need.

  The shape of the positive electrode 12 is not limited to the shape as shown in FIG. The shape of the positive electrode 12 may be a non-rectangular shape or a rectangular shape.

  The first separator material 11A is transported in the direction of arrow Y1 in FIG. That is, the portion of the first separator material 11A where the notch 31 is formed at the first working position T1, that is, the region serving as the first separator 11 for one element to which the positive electrode 12 is adhered is the first working material. It is transported to a second work position T2 different from the position T1.

  Subsequently, at the second working position T2, the positive electrode transport head 24 picks up an area serving as the first separator 11 for one element to which the positive electrode 12 is adhered, and cuts the uncut portion 35. That is, the non-cut portion 35 is cut off by adsorbing the region serving as the first separator 11 for one element to which the positive electrode 12 is adhered by the positive electrode transport head 24 and raising the positive electrode transport head 24. Then, the first separator 11 for one element to which the positive electrode 12 is adhered is separated from the first separator material 11A. Thereby, the first separator 11 to which the positive electrode 12 is adhered, that is, the first separator 11 for one element is obtained.

  Subsequently, the first separator 11 to which the positive electrode 12 is adhered is picked up and transferred to the stacking stage 25 by the positive electrode transfer head 24, the positive electrode 12 is recognized by a camera (not shown), the position and orientation are corrected, and the stacking is performed. It is placed on the stage 25. The first separator 11 and the positive electrode 12 placed on the stacking stage 25 are necessary until the second separator 13 for one element to which the negative electrode 14 is adhered is stacked thereon in the next step. Accordingly, it is pressed from above by the stacking claws 27.

  In FIG. 3, the first separator material 11 </ b> A in a state where the first separator 11 for one element to which the positive electrode 12 is adhered is picked up and separated by the positive electrode transport head 24 at the second work position T <b> 2. Is shown.

  As described above, in the method for manufacturing the electrode body 10 according to the present embodiment, at the first working position T1, based on the position of the positive electrode 12, the first separator material 11A is cut while leaving the uncut portion 35 partially. Then, the first separator material 11A having the cuts 31 formed therein is conveyed from the first work position T1 to the second work position T2. Then, at the second working position T2, an area serving as the first separator 11 for one element to which the positive electrode 12 is bonded is picked up, and the uncut portion 35 is cut by raising the positive electrode transport head 24, The first separator 11 for one element is separated from the first separator material 11A. After that, the separated first separators 11 for one element are transported to the stacking stage 25. As described above, when cutting the first separator material 11A based on the position of the positive electrode 12, the notch 31 is formed while leaving the uncut portion 35, so that the first separator material having the cut 31 is formed. When transporting 11A from the first working position T1 to the second working position T2, it is possible to suppress the displacement of the region that becomes the first separator 11 after cutting.

  For example, in the case of a positive electrode in which a positive electrode active material is formed only on one surface of a positive electrode current collector, warpage may occur. The warped positive electrode has a reduced warpage when bonded to the first separator material 11A. However, when the first separator material 11A is cut, the positive electrode 12A remains uncut. When the periphery is cut, the restrained warpage returns, and a displacement easily occurs when the sheet is transported from the first work position T1 to the second work position T2.

  However, according to the present embodiment, as described above, when the cut 31 is made in the first separator material 11A, the uncut portion 35 is left, so that the region that becomes the first separator 11 after cutting is not cut. Since it is connected to the first separator material 11A via the cut portion 35, it is possible to suppress the occurrence of displacement.

  In particular, the notch 31 of the first separator material 11A causes a positional shift of a region serving as the first separator 11 for one element to which the positive electrode 12 is adhered when the cut first separator material 11A is transported. This is performed in such a manner that the uncut portion 35 is cut off when picking up a region to be the first separator 11 for one element to which the positive electrode 12 is adhered and the first electrode 11 for one element is cut after cutting. Of the region serving as the separator 11 can be effectively suppressed.

  Further, as shown in FIG. 3, the shape of the positive electrode 12 in the present embodiment is a non-rectangular shape. However, even in this case, it is possible to suppress the occurrence of displacement of the region serving as the first separator 11 after cutting. Can be.

  Further, a step of making a cut 31 in the first separator material 11A, and a step of picking up a region to be the first separator 11 for one element to which the positive electrode 12 is adhered and separating it from the first separator material 11A, Since it is performed at another position, the efficiency of the manufacturing process can be improved.

  That is, the step of making the cut 31 in the first separator material 11A and the step of picking up the first separator 11 for one element to which the positive electrode 12 is adhered and separating it from the first separator material 11A are performed at the same position. In this case, the cutting mechanism 23 and the positive electrode transport head 24 work at the same position, and the work efficiency is reduced. However, according to the present embodiment, the cutting mechanism 23 performs a cutting operation at the first operation position T1, and the positive electrode transport head 24 cuts the uncut portion 35 at the second operation position T2. Since the operation of picking up the first separator 11 for one element is performed, the operation efficiency can be improved.

  After the first separator 11 to which the positive electrode 12 is adhered is picked up by the positive-electrode transfer head 24, the first separator material 11A is collected.

  The steps described above are also performed on the negative electrode 14. That is, first, the negative electrode 14 is placed on a long second separator material (not shown), and the negative electrode 14 is bonded to the second separator material. Similarly to the case where the positive electrode 12 is bonded to the first separator material 11A, the negative electrode 14 is bonded to the second separator material at a position at a predetermined distance from one end in the width direction. The one end in the width direction of the second separator material is the end on the side where the negative electrode tab projects when the negative electrode 14 is bonded.

  Subsequently, at the third working position, a cut is made in the second separator material based on the position of the negative electrode 14 while leaving an uncut portion in a part. The method of making a cut in the second separator material is the same as the method of making a cut in the first separator material.

  The second separator material is also transported in one direction. The portion of the second separator material cut at the third working position, that is, the region serving as the second separator 13 for one element to which the negative electrode 14 is adhered is the fourth working material different from the third working position. Conveyed to the work position.

  Subsequently, at the fourth working position, the region serving as the second separator 13 for one element to which the negative electrode 14 is adhered is picked up by the negative electrode transport head 26 and the uncut portion is cut. In other words, the non-cut portion is cut off by adsorbing the region serving as the second separator 13 for one element to which the negative electrode 14 is bonded by the negative electrode transport head 26 and raising the negative electrode transport head 26, The second separator 13 for one element to which the negative electrode 14 is adhered is separated from the second separator material. Thereby, the second separator 13 to which the negative electrode 14 is adhered, that is, the second separator 13 for one element is obtained.

  Subsequently, the second separator 13 to which the negative electrode 14 is adhered is transported to the stacking stage 25 by the negative electrode transport head 26, and the second separator 13 is moved while aligning the position between the positive electrode 12 and the negative electrode 14. Is laminated on the first separator 11, more specifically, on the positive electrode 12 adhered on the first separator 11. The alignment between the positive electrode 12 and the negative electrode 14 is performed, for example, by detecting the position of the positive electrode 12 on the stacking stage 25 and making the detected position of the positive electrode 12 coincide with the position of the negative electrode 14 after lamination.

  The laminated second separator 13 and negative electrode 14 are pressed from above by the laminating claws 27 as necessary until the first separator 11 to which the positive electrode 12 is adhered is laminated thereon in the next step.

  Also in this case, when the second separator material is cut based on the position of the negative electrode 14, a cut is made while leaving the uncut portion, so that the cut second separator material is replaced with the third cut. When the sheet is conveyed from the work position to the fourth work position, it is possible to suppress the displacement of the region serving as the second separator 13 after cutting.

  In particular, the cut of the second separator material does not cause displacement of a region to be the second separator 13 for one element to which the negative electrode 14 is adhered when the cut second separator material is transported, In addition, since an uncut portion is cut when a region serving as the second separator 13 for one element to which the negative electrode 14 is bonded is picked up, the second separator 13 for one element is cut after cutting. It is possible to effectively suppress the occurrence of positional deviation of the region.

  Further, the step of making a cut in the second separator material and the step of picking up a region to be the second separator 13 for one element to which the negative electrode 14 is adhered and separating it from the second separator material are performed at different positions. Therefore, the efficiency of the manufacturing process can be improved.

  As described above, in the method for manufacturing the electrode body 10 according to the present embodiment, when the cut first separator material 11A is transferred from the first working position T1 to the second working position T2, the cutting is performed. , The displacement of the first separator 11 for one element to which the positive electrode 12 is adhered can be suppressed. Further, when the cut second separator material is transported from the third working position to the fourth working position, the second separator 13 for one element to which the negative electrode 14 is adhered is obtained by cutting. Can be suppressed from occurring. Furthermore, before laminating the first separator 11 for one element to which the positive electrode 12 is bonded and the second separator 13 for one element to which the negative electrode 14 is bonded, alignment between the positive electrode 12 and the negative electrode 14 is performed. As a result, the displacement between the positive electrode 12 and the negative electrode 14 of the manufactured electrode body 10 can be more effectively suppressed.

  Thereafter, the subsequently obtained first separator 11 to which the positive electrode 12 is adhered is transported to the stacking stage 25 by the positive electrode transport head 24, and the first separator 11 is aligned with the first electrode 11 while the position between the positive electrode 12 and the negative electrode 14 is adjusted. The separator 11 is laminated on the second separator 13, more specifically, on the negative electrode 14 adhered on the second separator 13. The stacked first separator 11 and the positive electrode 12 are pressed from above by the stacking claws 27 as necessary until the second separator 13 to which the negative electrode 14 is adhered is stacked thereon in the next step.

  Thereafter, the lamination of the second separator 13 to which the negative electrode 14 adheres and the first separator 11 to which the positive electrode 12 adheres are repeated until the number of laminated positive electrodes 12 and negative electrodes 14 reaches a predetermined number.

  Finally, the whole of the stacked first separator 11, the positive electrode 12, the second separator 13, and the negative electrode 14 is bonded. For example, as shown in FIG. 4, by pressing a thermocompression bonding head 40 having a built-in heater from above a laminate in which the first separator 11, the positive electrode 12, the second separator 13, and the negative electrode 14 are laminated. The whole of the first separator 11, the positive electrode 12, the second separator 13 and the negative electrode 14 is thermocompression-bonded.

  The heater may be incorporated not only in the thermocompression bonding head 40 but also in the lamination stage 25, or may be built in only the lamination stage 25 without being built in the thermocompression bonding head 40.

  Through the above steps, the electrode body 10 is manufactured.

  The present invention is not limited to the above embodiments, and various applications and modifications can be made within the scope of the present invention.

  For example, in the method of manufacturing an electrode body according to the above embodiment, the entirety of the first separator 11, the positive electrode 12, the second separator 13, and the negative electrode 14, which constitute the electrode body 10, is laminated and then bonded. However, each time the first separator 11 and the second separator 13 are laminated, the laminated first separator 11, positive electrode 12, second separator 13 and negative electrode 14 may be bonded together. .

  For example, a heater may be built in the transport head 24 for the positive electrode, and when the first separator 11 to which the positive electrode 12 is adhered is laminated, thermocompression bonding may be performed by the transport head 24 for the positive electrode. Similarly, a heater may be built in the negative electrode transport head 26, and when the second separator 13 to which the negative electrode 14 is adhered is laminated, thermocompression bonding may be performed by the negative electrode transport head 26. With such a configuration, the thermocompression bonding head 40 described above can be omitted.

  The manufactured electrode body 10 may have a structure including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and may have any shape. For example, the shapes of all the stacked positive electrodes may not be the same, and the shapes of all the stacked negative electrodes may not be the same. For example, the shape of the positive electrode and the negative electrode located in the upper layer may be smaller than that of the positive electrode and the negative electrode located in the lower layer in the laminating direction, and may have a step in the laminating direction.

Reference Signs List 10 electrode body 11 first separator 11A first separator material 12 positive electrode 12A positive electrode tab 13 second separator 14 negative electrode 21 separator unwinding section 22 bonding section 23 cutting mechanism section 23a cutting blade 24 positive transfer head 25 stacking stage 26 Negative transfer head 27 Stacking claw 31 Cut 35 Uncut portion 40 Thermocompression bonding head T1 First working position T2 Second working position

Claims (3)

A method of manufacturing an electrode body including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
Bonding the positive electrode to a long first separator material;
In the first working position, based on the position of the positive electrode, while leaving an uncut portion in a part, surrounding the region serving as a first separator for one element to which the positive electrode is adhered, A step of making a cut in the separator material,
Cut the first separator material so that a region serving as the first separator for one element to which the positive electrode is adhered is located at a second work position different from the first work position. Transporting,
In the second working position, a region serving as the first separator for one element to which the positive electrode was bonded was picked up, the uncut portion was cut, and the positive electrode was bonded from the first separator material. Separating the first separator for one element;
Transporting the separated first separator for one element to which the positive electrode is adhered to a stacking stage;
Adhering the negative electrode to a long second separator material;
In the third working position, based on the position of the negative electrode, while leaving an uncut portion in a part, surrounding the region serving as a second separator for one element to which the negative electrode is adhered, A step of making a cut in the separator material,
The cut second separator material is cut such that a region serving as the second separator for one element to which the negative electrode is attached is located at a fourth work position different from the third work position. Transporting,
In the fourth working position, a region serving as the second separator for one element to which the negative electrode was bonded was picked up, the uncut portion was cut, and the negative electrode was bonded from the second separator material. Separating the second separator for one element;
Transporting the separated second separator for one element to which the negative electrode is adhered to the stacking stage;
Stacking the first separator for one element to which the positive electrode is attached, and the second separator for one element to which the negative electrode is attached, in the stacking stage;
A method for producing an electrode body, comprising: The notch of the first separator material, when transporting the notched first separator material, no displacement occurs in the region serving as the first separator for one element to which the positive electrode is adhered, And, when picking up a region serving as the first separator for one element to which the positive electrode is adhered, the uncut portion is cut in a manner to be cut,
The notch of the second separator material, when transporting the cut second separator material, no displacement occurs in the region serving as the second separator for one element to which the negative electrode is adhered, And a method of manufacturing an electrode body, wherein the uncut portion is cut when a region serving as the second separator for one element to which the negative electrode is adhered is picked up.   3. The method according to claim 1, wherein the shape of the positive electrode and the shape of the negative electrode are non-rectangular.

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