JP2016031812A - Device and method for manufacturing power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for manufacturing a power storage device capable of easily making the PN ratio closer to a desired value while reducing the waste.SOLUTION: An electrode assembly are arranged in layers in a state where a positive electrode having an active material layer for the positive electrode formed in a metal foil and a negative electrode having the active material layer for the negative layer formed in the metal foil are arranged with a separator between them. When a unit weight of the positive electrode after applying a coating agent 52 onto the metal foil 51 of the positive electrode is measured and the coating agent 62 is applied onto the metal foil 61 of the negative electrode, the measured unit weight of the positive electrode is reflected to the unit weight of the negative electrode.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a power storage device having an electrode assembly and a device for manufacturing the power storage device.

  A power storage device such as a lithium ion secondary battery has an electrode assembly, and the electrode assembly is arranged in layers with a positive electrode and a negative electrode interposed between separators. In the positive electrode, a positive electrode active material layer is formed on a current collector. In the negative electrode, a negative electrode active material layer is formed on a current collector. The active material layer is formed by applying a coating agent having an active material to the current collector, and taking into consideration the basis weight of the positive electrode and the basis weight of the negative electrode when manufacturing the power storage device. (For example, Patent Document 1).

JP-A-9-283117

  By the way, in order to prevent lithium (Li) from depositing even when a lithium ion secondary battery as a power storage device is overcharged due to inconvenience of a charger, the negative electrode receiving capacity is made larger than the positive electrode taking capacity. Designing. Further, since the cell capacity becomes smaller as the PN ratio (ratio between the positive electrode capacity P and the negative electrode capacity N) becomes larger (the negative electrode capacity is larger), it causes a decrease in the energy density of the battery. Furthermore, it is necessary to design the PN ratio in consideration of manufacturing variations (tolerances), and the target PN ratio must be set large (negative electrode capacity increased) due to the tolerance of the basis weight. Specifically, the variation in the PN ratio is the variation in the basis weight when the coating agent is applied to the positive electrode current collector, the variation in the basis weight when the coating agent is applied to the negative electrode current collector, and the coating agent. This is due to variations in the mixing ratio in the slurry. In particular, the weight per unit area will vary by about ± 3%, so if you consider the worst specifications for positive and negative pole variations (one pole is + 3% and the other pole is -3%), add about 6%. Is required.

  An object of the present invention is to provide a method for manufacturing a power storage device and a device for manufacturing a power storage device that can easily bring the PN ratio close to a desired value while reducing waste.

  In the first aspect of the present invention, the positive electrode in which the positive electrode active material layer is formed on the current collector and the negative electrode in which the negative electrode active material layer is formed on the current collector are arranged in layers with a separator interposed therebetween. A method of manufacturing a power storage device having an electrode assembly, wherein the weight of the one electrode after applying a coating agent having an active material to a current collector of one of the positive electrode and the negative electrode When measuring the amount and applying the coating agent having the active material to the current collector of the other of the positive electrode and the negative electrode, the measured weight of the one electrode The gist is that it is reflected in the basis weight.

  According to the first aspect of the present invention, when the weight per unit area of the positive electrode and the negative electrode is measured and the coating agent is applied to the current collector of the other electrode, the measured one electrode By reflecting the weight per unit area in the weight per unit area of the other electrode, it is only necessary to consider the variation in the weight per unit area of the variation in the per unit area of the positive electrode and the per unit area of the negative electrode. As a result, it is possible to easily bring the PN ratio close to a desired value while reducing waste.

As described in claim 2, in the method of manufacturing the power storage device according to claim 1, the one electrode is preferably a positive electrode.
According to a third aspect of the present invention, in the method for manufacturing the power storage device according to the second aspect, the weight per unit area is measured after the coating agent is applied to one side of the positive electrode current collector, and the positive electrode current collector is also measured. It is preferable to measure the basis weight even after applying the coating agent on one side of the film.

  The power storage device manufacturing method according to any one of claims 1 to 3, wherein a current collecting amount is reflected when the basis weight of the one electrode is reflected in the basis weight of the other electrode. It is good to adjust the discharge amount of the coating agent to the body.

  In the invention according to claim 5, the positive electrode in which the active material layer for positive electrode is formed on the current collector and the negative electrode in which the active material layer for negative electrode is formed on the current collector are arranged in layers with a separator interposed therebetween. A power storage device manufacturing apparatus having an electrode assembly, wherein the first coating machine applies a coating agent having an active material to a current collector of one of the positive electrode and the negative electrode; A second coating machine that applies a coating agent having an active material to a current collector of the other of the positive electrode and the negative electrode, and a current collector of one pole using the first coating machine The basis weight measuring means for measuring the basis weight after applying the coating agent to the body, and the basis weight when applying the coating agent to the current collector of the other electrode using the second coating machine. Feedback means for reflecting the basis weight of one pole measured by the quantity measuring means on the basis weight of the other pole The gist.

  According to the invention described in claim 5, in the basis weight measuring means, the basis weight after the coating agent is applied to the current collector of one electrode using the first coating machine is measured. In the feedback means, when the coating agent is applied to the current collector of the other electrode using the second coating machine, the basis weight of the one pole measured by the basis weight measuring means is equal to that of the other pole. It is reflected in the basis weight. Therefore, it is only necessary to consider the variation in the basis weight of the positive electrode and the variation in the basis weight of the negative electrode, and the PN ratio can be easily brought close to the desired value while reducing waste.

  According to the present invention, it is possible to easily bring the PN ratio close to a desired value while reducing waste.

The disassembled perspective view which shows typically the electrode assembly in embodiment. The schematic block diagram which shows an electrode manufacturing apparatus. Explanatory drawing which shows the manufacturing process of an electrode assembly. Explanatory drawing which shows the manufacturing process of the electrode assembly of another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a lithium ion secondary battery as a power storage device mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle) has an electrode assembly 10. The electrode assembly 10 is disposed in the case.

  The electrode assembly 10 is laminated in a state where the positive electrode 20 and the negative electrode 30 are interposed with the separator 40 therebetween. The positive electrode 20 includes a rectangular metal foil 21. The positive electrode 20 has positive electrode active material layers 22 formed on both surfaces of a metal foil 21 as a current collector. The negative electrode 30 includes a rectangular metal foil 31. The negative electrode 30 has a negative electrode active material layer 32 formed on both surfaces of a metal foil 31 as a current collector. The metal foil 21 of the positive electrode 20 is made of, for example, aluminum, and the metal foil 31 of the negative electrode 30 is made of, for example, copper.

  In addition, a positive electrode lead 20a having a rectangular shape (substantially rectangular shape) is formed on the metal foil 21 of each positive electrode 20 so as to extend upward. A negative electrode lead 30a having a rectangular shape (substantially rectangular shape) is formed on the metal foil 31 of each negative electrode 30 so as to extend upward. An active material layer is not formed on the surfaces of the leads 20a and 30a. The separator 40 has a bag shape. The positive electrode 20 is housed in a bag-like separator 40 with the positive electrode lead 20a positioned outside.

  As shown in FIG. 2, the lithium ion secondary battery electrode manufacturing apparatus includes a first coating machine 50 and a second coating machine 60. The 1st coating machine 50 is for apply | coating the coating agent 52 which has an active material to the strip | belt-shaped metal foil 51 which is a precursor of a positive electrode. The 2nd coating machine 60 is for apply | coating the coating agent 62 which has an active material to the strip | belt-shaped metal foil 61 which is a precursor of a negative electrode.

  The first coating machine 50 includes a die head 53, a pump 54, and a tank 55. The tank 55 contains a positive electrode coating agent 52. The coating agent 52 is a slurry obtained by kneading and diluting a positive electrode active material made of lithium metal oxide, a conductive additive, a binder, a solvent, and the like. The coating agent 52 in the tank 55 is pumped to the die head 53 by the pump 54. The coating agent 52 pumped by the pump 54 is discharged through the die head 53. A backup roll 56 is disposed at a position separated from the discharge port of the die head 53 by a predetermined distance. The band-shaped metal foil 51 is wound around the outer periphery of the backup roll 56, and the backup roll 56 supports the band-shaped metal foil 51 so that it can be continuously conveyed by rotating itself. In the coating process, the strip-shaped metal foil 51 is held in a roll shape wound around a cylindrical core. One end is drawn out from this state, and the coating agent 52 discharged from the die head 53 is applied to the strip-shaped metal foil 51 supported by the backup roll 56. After application of the coating agent 52, the strip-shaped metal foil 51 passes through the dryer, removes the solvent, and is wound up again.

  The second coating machine 60 includes a die head 63, a pump 64, and a tank 65. The tank 65 contains a negative electrode coating agent 62. The coating agent 62 is a slurry obtained by kneading and diluting a negative electrode active material made of graphite, a conductive additive, a binder, a solvent, and the like. The coating agent 62 in the tank 65 is pumped to the die head 63 by the pump 64. The coating agent pumped by the pump 64 is discharged through the die head 63. A backup roll 66 is disposed at a position separated from the discharge port of the die head 63 by a predetermined distance. A band-shaped metal foil 61 is wound around the outer periphery of the backup roll 66, and the backup roll 66 supports the band-shaped metal foil 61 so that it can be continuously conveyed by rotating itself. In the coating process, the strip-shaped metal foil 61 is held in a roll shape wound around a cylindrical core. From this state, one end is extended, and the coating agent 62 discharged from the die head 63 is applied to the strip-shaped metal foil 61 supported by the backup roll 66. After application of the coating agent 62, the strip-shaped metal foil 61 passes through the dryer, removes the solvent, and is wound up again.

  Further, the second coating machine 60 is provided with a discharge amount adjuster 68. The discharge amount adjusting device 68 can adjust the pressure of the coating agent to the die head 63 in the pump 64, and the adjustment allows the discharge amount of the coating agent 62 in the die head 63 to be adjusted.

Next, the operation will be described.
FIG. 3 shows from the coating process (front surface coating and back surface coating in FIG. 3) to the laminating process during the process involved in the production of the electrode assembly of the lithium ion secondary battery. The entire battery manufacturing process includes a kneading process for manufacturing and adjusting the coating agent before the coating process, a sealing process for storing the electrode assembly in the cell case after the lamination process, etc. Details are omitted.

  In FIG. 3, a positive electrode, a negative electrode, and a separator are respectively manufactured, and the separator is wrapped with the positive electrode after cutting, and the separator and the negative electrode wrapped with the positive electrode are laminated. At this time, a coating agent (slurry) is prepared in a kneading process in advance, and the coating agent is accommodated in the tanks 55 and 65 to manufacture a positive electrode and a negative electrode. In the present embodiment, the same roll body is used as the positive or negative electrode strip metal foil, which is applied with a coating agent produced by one kneading, that is, one lot of the strip metal foil without changing the coating conditions. To do.

This will be described in detail below.
First, a positive electrode is manufactured. In the manufacturing process of the positive electrode, one end is fed out from the roll body of the strip-shaped metal foil 51 of the positive electrode using the first coating machine 50, and the coating agent 52 having an active material is applied to the surface which is one surface, Then, after removing most of the solvent by passing it through a dryer, it is wound up. Further, the first coating machine 50 is used to apply a coating agent 52 having an active material to the back surface, which is the other surface of the strip-shaped metal foil 51 of the positive electrode, and similarly dry, and then wind it. Thereafter, an appearance inspection is performed to inspect the presence / absence of an abnormality in the coated part to which the coating agent is applied, according to the surface state. Furthermore, after passing through processes such as a roll press for increasing the density of the active material layer and drying under reduced pressure, punching is performed to form individual positive electrodes 20 having a rectangular shape. The positive electrode 20 after being punched is sandwiched between two sheet-like separators, and the periphery of the separator is welded. As a result, the positive electrode 20 is wrapped by the separator except for the lead 20a.

  On the other hand, after the positive electrode is manufactured, the negative electrode 30 which is a pair in the same electrode assembly is manufactured. In the manufacturing process of the negative electrode 30, one end is fed out from the roll body of the strip-shaped metal foil 61 of the negative electrode using the second coating machine 60, and a coating agent 62 having an active material is applied to the surface which is one surface. Then, after passing through a dryer to remove most of the solvent, it is wound up. Further, the second coating machine 60 is used to apply a coating agent 62 having an active material to the back surface, which is the other surface of the strip-shaped metal foil 61 of the negative electrode, and similarly dry, and then wind it. Thereafter, an appearance inspection is performed. Furthermore, after passing through processes such as roll pressing and vacuum drying, punching is performed to form individual negative electrodes 30 having a rectangular shape. The negative electrode after punching and the separator surrounding the positive electrode are laminated.

  In this embodiment, the coating weight 52 is applied to the strip-shaped metal foil 51 of the positive electrode in the positive electrode manufacturing process and dried, and then the basis weight is measured as shown in FIG. Since the basis weight is proportional to the thickness, the thickness is measured and the basis weight is calculated. As a specific example, when the coating agent is applied to the strip-shaped metal foil 51, uncoated portions where the metal foil is exposed remain on both side ends thereof. By using a laser displacement meter between the uncoated part and the coated part, the thickness of the coated part can be measured, and the basis weight can be calculated from the thickness of the coated part. The thickness itself may be used as an alternative value for the basis weight. Note that the basis weight of the strip-shaped metal foil 51 of the positive electrode needs to be measured individually for the front surface and the back surface.

  When the coating agent 62 is applied to the metal foil 61 of the negative electrode 30 using the second coating machine 60, the measured basis weight of the positive electrode is fed back to each of the front and back surfaces, and the basis weight of the negative electrode 30 To reflect. Specifically, the discharge amount adjuster 68 is operated to adjust the discharge amount of the coating agent 62 onto the metal foil 61. In the stacking step, the stacking is performed so that the surface of the positive electrode 20 and the surface of the negative electrode 30 and the back surface of the positive electrode 20 and the back surface of the negative electrode 30 corresponding to the basis weight correspond to each other by the feedback described above.

  As the variation in the basis weight, there are variations in lots and variations in lots. Variations among lots are caused by variations in dilution by the solvent of the coating agents 52 and 62 in the kneading process, adjustment of coating conditions at the start of equipment operation, and the like. Variations in lots include variations in the film thickness of the coating film due to roll expansion due to temperature rise during operation. The variation for each lot is larger than the variation in the lot, and this embodiment corrects the variation for each lot having a large variation.

In this embodiment, the negative electrode coating is performed by feeding back (reflecting) the actual weight (actually measured value) of the positive electrode, which is one pole, to the target value of the negative electrode, which is the other electrode.
Therefore, conventionally, since the variation in the basis weight is, for example, about ± 3%, about 6% in consideration of the worst specification of the variation of both poles (one pole is + 3% and the other pole is −3%). An extra minute was required. As described above, the coating weight of the positive electrode and the negative electrode is usually determined by applying a standard in consideration of variation (manufacturing error).

  In this embodiment, the coating amount of the negative electrode coating agent can be reduced by changing the basis of the basis weight of the negative electrode based on the basis weight of the positive electrode. That is, it is possible to reduce the additional amount of the basis weight variation to about half of 3%. Thereby, the energy density of the battery can be improved by reducing the PN ratio (decreasing the negative electrode capacity). Moreover, the usage-amount (application amount) of the coating agent in a negative electrode can be reduced, and cost reduction can be aimed at.

  Specifically, if there is not a negative electrode that can sufficiently receive the lithium ions released by the positive electrode, excess lithium is likely to precipitate. The amount of the active material is larger than that of the positive electrode so that the negative electrode can sufficiently receive lithium ions, and has a safety margin. At this time, the coating agent can be reduced if there is no variation in coating. However, the weight per unit area of the positive and negative electrodes varies by, for example, ± 3% on the positive electrode side and the negative electrode side due to variations in the film thickness of the coating film at the time of coating. Here, in the case of the positive electrode side reference which is an electrode on one side of the positive electrode and the negative electrode, the margin on the negative electrode side to be set is only ± 3%, and waste can be reduced.

According to the above embodiment, the following effects can be obtained.
(1) As a method for manufacturing a power storage device, the basis weight of the positive electrode 20 after the coating agent 52 having an active material is applied to the metal foil 51 of the positive electrode 20 that is one of the positive electrode 20 and the negative electrode 30 is measured. Then, when the coating agent 62 having an active material is applied to the metal foil 61 of the negative electrode 30 which is the other of the positive electrode 20 and the negative electrode 30, the measured amount of the positive electrode 20 is the measured amount of the negative electrode 30. It was made to reflect in. Therefore, when the basis weight of the positive electrode 20 is measured and the coating agent 62 is applied to the metal foil 61 of the negative electrode 30, the measured basis weight of the positive electrode 20 is reflected in the basis weight of the negative electrode 30. Only one of the variation in the basis weight of the negative electrode 30 and the variation in the basis weight of the negative electrode 30, that is, the variation in the basis weight of the negative electrode 30 may be considered. That is, when the negative electrode receiving capacity (N) is made larger than the positive electrode extracting capacity (P), the variation can be reduced to about half. As a result, it is possible to easily bring the PN ratio close to a desired value while reducing waste. In addition, compared with the case where the PN ratio is made closer to a desired value by reducing the variation in the basis weight by using a highly accurate manufacturing apparatus, the present embodiment can easily reduce the waste even if the accuracy of the manufacturing apparatus is not high. The PN ratio can be brought close to a desired value.

  (2) In particular, one of the positive electrode and the negative electrode is the positive electrode 20, and the other electrode is the negative electrode 30. Therefore, since the positive electrode 20 is an element that determines the cell capacity, the following effects can be obtained. The basis weight of the negative electrode 30 when the coating agent 62 having the active material is applied to the metal foil 61 of the negative electrode 30 is the same as the basis weight after the coating agent 52 having the active material is applied to the metal foil 51 of the positive electrode 20. By reflecting, it is the capacity of the positive electrode that determines the capacity of the cell, and if the pole to be applied first is the positive electrode, the capacity of the cell can be made uniform.

  (3) When reflecting the basis weight of the positive electrode 20 on the basis weight of the negative electrode 30, the discharge amount of the coating agent 62 onto the metal foil 61 is adjusted. Therefore, it is preferable to adjust the discharge amount when finely adjusting the basis weight.

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the above embodiment, an example of lithium metal oxide as the positive electrode active material and graphite as the negative electrode active material has been described, but the present invention is not particularly limited thereto. As the positive electrode active material and the negative electrode active material, other known combinations can be used.

  ・ Measurement of the basis weight (actual measurement) was performed after coating on both sides of the positive electrode, and the basis weight on the front and the basis weight on the back were measured respectively, and reflected in the basis weight on both sides of the negative electrode. Instead, as shown in FIG. 4, after each drying of the front surface and the back surface, measurement may be performed each time to reflect the weight per unit area of the front and back surfaces of the negative electrode.

  As described above, the weight per unit area is measured after the coating agent 52 is applied to one side of the metal foil 51 of the positive electrode 20 and the basis weight is also measured after the coating agent 52 is applied to the other side of the metal foil 51 of the positive electrode 20. By measuring, the weight per unit area of the positive and negative electrodes facing each other can be controlled more accurately.

  In the above-described embodiment, the basis weight of the positive electrode is replaced with the film thickness of the coated part, but the basis weight may be directly measured. Specifically, after applying the coating agent 52 on the surface of the strip-shaped metal foil 51 of the positive electrode in the manufacturing process of the positive electrode and drying it, a part of the positive electrode, for example, a circular small piece is punched out, and the weight of this small piece (sampled piece) Is measured, and the weight per unit area (the weight of the coating film) is calculated by subtracting the weight of the metal foil in the small piece. Similarly, the coating weight 52 (weight of the coating film) can be calculated by punching out small pieces and measuring the weight after coating the coating agent 52 on the back surface and drying. In the case of the back surface, the basis weight of the front surface is subtracted from the measured weight in addition to the weight of the metal foil.

  -A person measured the basis weight of the positive electrode and the person adjusted the basis weight of the negative electrode, but this is not restrictive. That is, as a power storage device manufacturing apparatus having an electrode assembly, as shown by an imaginary line 100 in FIG. 2, a basis weight measuring device as a basis weight measuring means (for example, measuring the thickness of a coating film with a sensor, Measuring the weight of the minute) and installing a feedback control device as feedback means as shown by the phantom line 110 may be automated.

  That is, as a configuration of the power storage device manufacturing apparatus, the first coating is performed by applying the coating agent 52 having an active material to the metal foil 51 as the current collector of the positive electrode 20 that is one of the positive electrode and the negative electrode. Machine 50. Moreover, it has the 2nd coating machine 60 which apply | coats the coating agent 62 which has an active material to the metal foil 61 as a collector of the negative electrode 30 which is the other pole of a positive electrode and a negative electrode. Furthermore, it has a basis weight measuring instrument 100 that measures the basis weight after applying the coating agent 52 to the metal foil 51 of the positive electrode 20 using the first coating machine 50. Furthermore, when the coating agent 62 is applied to the metal foil 61 of the negative electrode 30 using the second coating machine 60, the basis weight of the positive electrode 20 measured by the basis weight measuring device 100 is changed to the basis weight of the negative electrode 30. It has a feedback control device 110 to reflect.

  Thereby, only the variation in the basis weight of one of the variation in the basis weight of the positive electrode and the variation in the basis weight of the negative electrode need be considered. That is, it is sufficient to add only the variation in the basis weight of one of the variation in the basis weight of the positive electrode and the variation in the basis weight of the negative electrode. As a result, it is possible to easily bring the PN ratio close to a desired value while reducing waste.

  The amount of coating agent 62 discharged onto the metal foil 61 is adjusted when reflecting the basis weight of one pole on the basis weight of the other pole (at the time of feedback), but is not limited to this. For example, the feeding amount of the metal foil 61 may be adjusted.

-Although the measurement of the basis weight (actual measurement) was performed after coating and drying, it may be performed before drying.
The weight per unit area after applying the coating agent 52 to the metal foil 51 of the positive electrode 20 was reflected in the amount per unit area of the negative electrode 30 when the coating agent 62 was applied to the metal foil 61 of the negative electrode 30. The basis weight after applying the coating agent 62 to the metal foil 61 of the negative electrode 30 may be reflected in the basis weight of the positive electrode 20 when the coating agent 52 is applied to the metal foil 51 of the positive electrode 20.

The first coating machine and the second coating machine may be different types of coating machines.
-With the same coating machine, you may perform positive electrode coating (application | coating of the coating agent to metal foil) and negative electrode coating (application | coating of the coating agent to metal foil).

  The electrode assembly in the power storage device is applied to a stacked type, that is, a structure in which several tens of electrodes are stacked. However, the electrode assembly may be applied to a wound type, that is, a banded electrode. The point is that the positive electrode in which the positive electrode active material layer is formed on the current collector and the negative electrode in which the negative electrode active material layer is formed on the current collector are arranged in layers with a separator interposed therebetween.

  -You may apply as an electrical storage apparatus other than a lithium ion secondary battery. For example, the present invention may be applied to a nickel hydrogen secondary battery.

  DESCRIPTION OF SYMBOLS 10 ... Electrode assembly, 20 ... Positive electrode, 21 ... Metal foil, 22 ... Active material layer for positive electrodes, 30 ... Negative electrode, 31 ... Metal foil, 32 ... Active material layer for negative electrodes, 40 ... Separator, 50 ... 1st coating 51: metal foil, 52 ... coating agent, 60 ... second coating machine, 61 ... metal foil, 62 ... coating agent, 100 ... basis weight measuring instrument, 110 ... feedback control device.

Claims (5)

A power storage device having an electrode assembly in which a positive electrode in which a positive electrode active material layer is formed on a current collector and a negative electrode in which a negative electrode active material layer is formed on the current collector are arranged in layers with a separator interposed therebetween A manufacturing method of
Measure the basis weight of one of the positive electrode and the negative electrode after applying a coating agent having an active material to the current collector of one of the positive electrode and the negative electrode, When applying a coating agent having an active material to a current collector of an electrode, the measured weight per unit area of the one electrode is reflected in the measured per unit area of the other electrode. Production method.   The method for manufacturing a power storage device according to claim 1, wherein the one electrode is a positive electrode.   The basis weight is measured after applying the coating agent on one side of the current collector of the positive electrode, and the basis weight is also measured after applying the coating agent on the other side of the current collector of the positive electrode. Item 3. A method for manufacturing a power storage device according to Item 2.   The discharge amount of the coating agent to the current collector is adjusted when reflecting the basis weight of the one pole on the basis weight of the other pole. The manufacturing method of the electrical storage apparatus as described in any one of. A power storage device having an electrode assembly in which a positive electrode in which a positive electrode active material layer is formed on a current collector and a negative electrode in which a negative electrode active material layer is formed on the current collector are arranged in layers with a separator interposed therebetween Manufacturing equipment,
A first coating machine for applying a coating agent having an active material to a current collector of one of the positive electrode and the negative electrode;
A second coating machine for applying a coating agent having an active material to the current collector of the other of the positive electrode and the negative electrode;
A basis weight measuring means for measuring a basis weight after applying a coating agent to the current collector of one pole using the first coating machine;
When applying the coating agent to the current collector of the other pole using the second coating machine, the basis weight of one pole measured by the basis weight measuring means is changed to the basis weight of the other pole. Feedback means to reflect,
An apparatus for manufacturing a power storage device, comprising: