JP2010212227A - Method of manufacturing battery or capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a battery or a capacitor, wherein electrolytic solution can be impregnated in an electrode plate group in a short time. <P>SOLUTION: Before filling the electrolytic solution, a case into which the electrode plate group is inserted is pressurized with a prescribed pressure P [MPa] in a pressurization process S2, and thereafter, in an atmosphere opening process S3, the inside of the case is atmosphere-opened for a time t [sec] becoming "P/t≥0.5 [MPa/s]". Accordingly, the electrolyte solution is impregnated into the electrode plate group in a filling and impregnation process S4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery in which a separator is interposed between a positive electrode plate and a negative electrode plate, and the electrode plate group formed by winding in a stacked state or a stacked state is inserted into a battery case and injected with a predetermined amount of electrolyte, or between electrode plates The present invention relates to a method for manufacturing a capacitor in which an electrode plate group formed by interposing a separator and winding in a laminated state or a laminated state is inserted into an outer case and an electrolytic solution is injected.

In general, a battery is manufactured through a process in which an electrode group is accommodated in a battery case, and then an electrolytic solution is injected to seal an opening and / or an injection port of the battery case.
Here, the electrode plate group is formed by interposing a separator between the positive electrode plate and the negative electrode plate, and is densely laminated or spirally wound in a laminated state. In the electrolyte injection process, the electrode plate group is small. It was difficult for the electrolytic solution to penetrate into the gap, and it took a long time to impregnate the electrode group with a predetermined amount of the electrolytic solution.

  As a method of impregnating the electrode group into the electrode plate group, conventionally, a vacuum pump is connected to the opening of the battery case into which the electrolyte solution has been injected, and the air present in the gap between the electrode plate group is reduced by reducing the pressure inside the battery case. A method is used in which bubbles are floated on the liquid surface of the electrolytic solution.

  However, in this manufacturing method, since the bubbles generated in the gaps between the electrode plate groups adhere to the surface of the electrode plate group and do not quickly float on the surface of the electrolyte solution, the time until the electrolyte plate group is impregnated with the electrolyte solution. The shortening is not enough.

Therefore, various production methods have been proposed in order to further reduce the impregnation time.
In Patent Document 1, for example, an electrolytic solution is injected by repeatedly injecting an electrolytic solution under normal pressure and then impregnating the electrolytic solution under reduced pressure a plurality of times. Specifically, the battery case into which the electrolytic solution is injected is placed in a decompression booth, the first decompression process using the first vacuum pressure is performed on the battery case, and then the decompression release process is performed. After performing the 2nd pressure reduction process by the 2nd vacuum pressure whose vacuum degree is higher than the vacuum degree of the said 1st vacuum pressure, it has the process of giving the pressure reduction cancellation | release process.

  In this manufacturing method, by setting the vacuum degree of the second vacuum pressure higher than the first vacuum pressure, the electrolyte injected into the battery case is prevented from overflowing from the upper part of the battery case, Compared with the impregnation treatment under normal pressure, the impregnation time is shortened.

  In Patent Document 2, etc., the inside of the battery case containing the electrode plate group is depressurized, the electrolyte solution is injected while maintaining the depressurized state, and then the atmosphere is released or pressurized to bring the electrolyte solution into the electrode plate group. A method of complete impregnation is disclosed.

FIG. 14 shows an apparatus for realizing the manufacturing method described in Patent Document 2.
The battery includes a battery case 101 and an electrode plate group 102.
First, the battery is placed in the decompression / pressure tank 103 and the header 104 is attached.

  Next, after the inside of the decompression / pressurization tank 103 is evacuated to about 5 to 6 torr, a predetermined amount of electrolytic solution is injected into the header 104 and the battery through the header 104 from the injection port 105. At this time, an electrolytic solution surface 106 is formed in the header 104, and at least a part of the electrolytic solution is held in the header 104 so as to be in a liquid-sealed state.

Thereafter, a gas such as N 2 or dry air having a pressure equal to or higher than the atmospheric pressure is introduced into the decompression / pressurization tank 103 and the pressure is increased to a pressure equal to or higher than the atmospheric pressure. A pressure of about 1 to 3 kg / cm ² is usually sufficient.

  The electrolyte surface 106 in the header 104 decreases as the electrolyte is absorbed by the electrode plate group 102 and eventually reaches the inside of the battery case 101, and the electrode plate group 102 absorbs a predetermined amount of electrolyte and impregnates. finish.

  After the impregnation, the inside of the decompression / pressurization tank 103 is set to atmospheric pressure, the battery is removed from the header 104, taken out, and sent to the next process.

JP 11-339770 A JP-A-2-172158

However, in recent years, as the capacity of the battery is increased, the electrode plate group is wound at a high density, so that there are the following problems.
In the manufacturing method of Patent Document 1, when the battery case is subjected to a decompression treatment after injecting the electrolytic solution, the air present in the electrode plate group does not easily escape, and the electrolyte solution impregnates the electrode plate group. Therefore, there is a problem that it takes a long time to impregnate a predetermined amount of the electrolyte.

  In the manufacturing method of Patent Document 2, when the inside of the decompression / pressurization tank 103 is evacuated / exhausted, the air in the electrode plate group 102 is not completely removed, and the electrolyte does not easily enter or enters the electrode plate group 102. However, when the pressure in the decompression / pressurization tank 103 is changed to atmospheric pressure, the air compressed in the electrode plate group 102 pushes back the electrolyte solution, and as a result, the electrode plate group 102 absorbs a predetermined amount of the electrolyte solution. It has a problem that it cannot be done.

  In addition, there is a similar problem in the manufacture of a capacitor in which a separator is interposed between electrode plates and the electrode plate group formed by laminating or winding in a laminated state is inserted into an outer case to inject an electrolyte. .

  The present invention solves the above-mentioned conventional problems, and even in an electrode plate group wound at high density, the electrolyte solution can easily enter the electrode plate group and can be impregnated with the electrolyte solution in a short time. An object of the present invention is to provide a method for manufacturing a battery or a capacitor that can be used.

  In the battery manufacturing method of the present invention, a separator is interposed between a positive electrode plate and a negative electrode plate, and an electrode plate group formed by laminating or winding in a laminated state is inserted into a battery case, and then a predetermined amount of electrolyte is injected. When the battery is manufactured, before the electrolyte is injected, the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and then the time t [sec] required for opening to the atmosphere. Is opened to the atmosphere so that P / t ≧ 0.5 [MPa / s]. Preferably, the pressurization and release to the atmosphere are repeated a plurality of times. In addition, the process from the pressurization to the atmosphere release is performed in a plurality of times, or is performed by changing the atmosphere release speed in the middle.

  In the battery manufacturing method of the present invention, a separator is interposed between a positive electrode plate and a negative electrode plate, and an electrode plate group formed by laminating or winding in a laminated state is inserted into a battery case, and then a predetermined amount of electrolyte is injected. When manufacturing the battery, before injecting the electrolyte, the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and then released to a pressure lower than the atmospheric pressure. The required time t [sec] is opened so that P / t ≧ 0.5 [MPa / s]. Preferably, the process of releasing the pressure from the pressure to a pressure lower than the atmospheric pressure is performed in a plurality of times, or is performed by changing the opening speed in the middle.

The battery manufacturing method of the present invention is characterized in that the period during which the inside of the battery case into which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa] is 0.05 [sec] or more.
According to the method of manufacturing a capacitor of the present invention, a separator is interposed between electrode plates, and an electrode plate group formed by laminating or winding in a laminated state is inserted into an outer case, and then a predetermined amount of electrolytic solution is injected into the capacitor. When the electrolyte is injected, the inside of the outer case into which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and then the time t [sec] required for opening to the atmosphere is set to P It is characterized by opening to the atmosphere so that /t≧0.5 [MPa / s]. Preferably, the pressurization and release to the atmosphere are repeated a plurality of times. In addition, the process from the pressurization to the atmosphere release is performed in a plurality of times, or is performed by changing the atmosphere release speed in the middle.

  According to the method of manufacturing a capacitor of the present invention, a separator is interposed between electrode plates, and an electrode plate group formed by laminating or winding in a laminated state is inserted into an outer case, and then a predetermined amount of electrolytic solution is injected into the capacitor. When injecting the electrolyte, before injecting the electrolyte solution, the inside of the outer case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and the time t [sec required for opening to a pressure lower than the atmospheric pressure is obtained. ] Is released so that P / t ≧ 0.5 [MPa / s]. Preferably, the process of releasing the pressure from the pressure to a pressure lower than the atmospheric pressure is performed in a plurality of times, or is performed by changing the opening speed in the middle.

  The method for manufacturing a capacitor according to the present invention is characterized in that a period during which the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa] is 0.05 [sec] or more.

  According to this configuration, it is possible to immediately impregnate the electrolyte in the electrode plate group of the battery or capacitor. As a result, the amount of the electrolytic solution volatilized can be reduced.

Flow chart of battery manufacturing method according to Embodiment 1 of the present invention Schematic perspective view of the pressure device used in the experiment conducted in the same embodiment Results and graph of battery impregnation evaluation test against pressure holding time Results and graphs of battery impregnation evaluation test for applied pressure Results and graphs of battery impregnation evaluation tests for air release rate. Results and graphs of battery impregnation evaluation tests for air release rate. Results and graph of battery impregnation evaluation test against number of pressurization Schematic of pressure profile in experiment conducted in the same embodiment Schematic of another pressure profile when the atmosphere is released in the same embodiment List of results of battery impregnation evaluation test for pressurization holding time of battery manufacturing method according to Embodiment 2 of the present invention, results of battery impregnation evaluation experiment for pressurization holding time, and graph thereof Schematic perspective view of the pressure device used in the experiment conducted in the same embodiment List of results and graphs of battery impregnation evaluation tests for short pressure holding times List of results and graph of impregnation evaluation test of battery against number of pressurizations of same embodiment Schematic of the manufacturing apparatus described in Patent Document 2

Hereinafter, the manufacturing method of this invention is demonstrated based on the specific example shown in FIGS.
(Embodiment 1)
FIG. 1 shows a flow chart of a battery manufacturing method according to Embodiment 1 of the present invention.

In the case insertion step S1, an electrode plate group formed by interposing a separator between a positive electrode plate and a negative electrode plate and winding in a laminated state or a laminated state is inserted into a battery case.
In the pressurizing step S2, the inside of the battery case in which the electrode plate group is inserted is pressurized to a pressure P [MPa].

In the air release step S3, the pressurized battery case is returned to atmospheric pressure.
In the liquid injection / impregnation step S4, a predetermined amount of electrolytic solution is impregnated in the electrode plate group after the air release step S3.

In the air release step S3 in this manufacturing process, the time t [sec] required for air release is set to “P / t ≧ 0.5 [MPa / s]”.
Here, in order to confirm the effect, the following experiment was conducted.

FIG. 2 shows a state where the tank of the pressurizing apparatus used in this experiment is opened.
The pressurization tank 1 is provided with an air supply port 2 and an exhaust port 3. After the battery 4 is stored, the pressurization tank 1 is closed and high-pressure air is blown from the air supply port 2. The inside and the battery 4 are pressurized to a predetermined pressure, and then can be opened to the atmosphere from the exhaust port 3. The exhaust port 3 is provided with a valve (not shown) so that the speed of pressure change when the atmosphere is released can be adjusted. As the battery 4, a cylindrical lithium ion secondary battery having an outer diameter of 18 mm and a length of 65 mm was used.

The impregnation evaluation was performed as follows in order to make a quantitative comparison.
First, 1.25 cc of an electrolyte was injected into the battery under atmospheric pressure, and evacuation was performed to extract air remaining in the battery. This operation is repeated a total of 3 times. After the last vacuuming, it is allowed to stand at atmospheric pressure, and the electrolyte remaining on the electrode plate group is impregnated in the electrode plate group, so that the liquid level can be confirmed visually. The time to disappear was measured and defined as the impregnation time.

Furthermore, based on the impregnation time of a battery not carrying out the present invention, the ratio of the impregnation time that could be shortened was calculated as the improvement rate. The calculation formula is as follows.
Improvement rate = [(impregnation time of unpressurized battery)-(impregnation time of pressurized battery)] / (impregnation time of unpressurized battery)
First, an experiment was performed using a battery in which the pressure in the pressurizing tank 1 was 0.8 MPa, and the time for maintaining the pressurized state (pressurization holding time) was changed. The experiment was performed in four patterns of pressurizing and holding times of 1 second, 5 seconds, 10 seconds, and 20 seconds.

An experimental result is shown to Fig.3 (a) (b).
FIG. 3A is a list of detailed experimental conditions and results, and FIG. 3B is a graph in which the horizontal axis represents the pressure holding time and the vertical axis represents the improvement rate.

  The air release time is a time measured after the exhaust port 3 is released until the pressure in the pressurized tank 1 returns to atmospheric pressure. From this result, it can be seen that the impregnation is not affected even if the pressurized state is maintained for a long time.

  Next, an experiment was performed using a battery in which the pressure during pressurization was changed. The experiment was conducted with six pressure patterns of 0.4 MPa, 0.6 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, and 1.4 MPa. Here, after reaching each pressure, the experiment was conducted with the time for maintaining the pressurized state (pressurized holding time) fixed to 1 second.

4 (a) and 4 (b) show the experimental results.
4A is a list of detailed experimental conditions and results, and FIG. 4B is a graph in which the horizontal axis represents pressure and the vertical axis represents the improvement rate.

Here, since the valve of the exhaust port 3 is fully opened when the atmosphere is released, the larger the pressure is, the longer the atmosphere release time is. The air release speed is calculated by dividing the pressure by the air release time. The calculation formula is the air release speed = (pressure in the pressurized tank) / (air release time)
It is.

From the graph of FIG. 4B, the higher the applied pressure, the better the impregnation property. However, when the pressure was 0.8 MPa or more, it was seen that there was no significant difference in the improvement rate.
Therefore, in order to see the correlation between the impregnation property and the air release rate, a plot was made with the air release rate on the horizontal axis and the improvement rate on the vertical axis. The graph is shown in FIG.

From this result, it can be predicted that the improvement rate tends to increase as the air release speed increases.
Therefore, in order to obtain confirmation, an experiment was conducted with a battery in which the pressure was set to 0.8 MPa, the opening ratio of the valve of the exhaust port 3 was adjusted, and the open time to the atmosphere was changed.

6 (a) and 6 (b) show the experimental results.
FIG. 6A is a list of detailed experimental conditions and results, and FIG. 6B is a graph obtained by adding the data of FIG. 6A to the graph of FIG.

From this result, it can be seen that the higher the air release speed, the higher the improvement rate tends to be, and in addition, the impregnation property deteriorates below a certain air release speed.
Therefore, considering that the impregnation property varies depending on the winding state of the electrode plate group and the state of the electrode plate, in order to improve the impregnation property in all the batteries, the atmosphere is released from FIG. 6 (b). It can be seen that the speed needs to be 0.5 MPa / s or more.

Finally, the operation of pressurization and release to the atmosphere was repeated, and the correlation between the number of times and the impregnation property was examined.
FIG. 7A is a list of detailed experimental conditions and results, and FIG. 7B is a graph in which the horizontal axis represents the number of pressurizations and the vertical axis represents the improvement rate.

From this result, it is understood that the impregnation property can be further improved by repeating the operations of pressurization and release to the atmosphere.
From the above experimental results, it is possible to improve the impregnation property by pressurizing the battery to a predetermined pressure and then releasing the atmosphere so that the atmospheric release speed is 0.5 MPa / s or more.

Further, by repeating the operations of pressurization and release to the atmosphere, further improvement in impregnation can be expected, and by adjusting the number of times in consideration of the improvement rate, productivity can be improved.
In the above experiment, since the operation for releasing the atmosphere is returned to the atmospheric pressure once, the pressure profile is as shown in FIG.

Here, since the open time to the atmosphere is defined by the time required to return from the predetermined pressure to the atmospheric pressure, it becomes the portion shown in FIG.
However, the effect of the present invention is manifested when the pressure is suddenly changing. If a sudden pressure change has occurred, the air release operation may be divided into multiple times. The air release speed may be changed.

  As an example, FIG. 9 (a) shows the pressure profile when the air release operation is divided into a plurality of times, and FIG. 9 (b) shows the pressure profile when the air is released suddenly after the pressure is gradually released. FIG. 9 (c) shows a pressure profile when the pressure is released suddenly and then gradually released into the atmosphere.

  When the release operation is divided into multiple times, the total time during which the pressure change has occurred is defined as the release time, and when the release rate is changed halfway, the portion with the maximum pressure change gradient is The opening speed.

In this embodiment, the atmosphere is opened to the atmosphere, but the vacuum may be drawn at once, and the present invention is not limited to atmospheric pressure.
(Embodiment 2)
10 to 13 show an embodiment of the present invention.

  In the first embodiment, before injecting the electrolytic solution, the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and then the time t [sec] required for opening to the atmosphere is examined. However, in the second embodiment, the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa] in the pressurizing step S2 in FIG. Are considering.

  In Embodiment 1, first, the pressure in the pressurizing tank 1 was set to 6 conditions of 0.4 MPa, 0.6 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, and 1.4 MPa, and each pressure was reached. Thereafter, the experiment was conducted with the time for maintaining the pressurized state (pressurization holding time) fixed to 1 second. In the second embodiment, the pressure in the pressurizing tank 1 was set to 0.8 MPa, and the pressure was increased. Experiments were performed using batteries with different pressure holding times. The experiment was conducted under four holding conditions of 1 second, 5 seconds, 10 seconds, and 20 seconds. The dimensions of the battery and the pressure device are the same as in the first embodiment.

  FIG. 10A is a list of detailed experimental conditions and results, and FIG. 10B is a graph in which the horizontal axis represents the pressure holding time and the vertical axis represents the improvement rate. The air release time is a time measured after the exhaust port 3 is released until the pressure in the pressurized tank 1 returns to atmospheric pressure. From this result, it can be seen that the impregnation is not affected even if the pressurized state is maintained for 1 second or more.

  Accordingly, the pressure tank having a smaller volume than the pressure tank 1 can be processed one by one as shown in FIG. 11 so that the pressure in the pressure tank 1 can be changed in a shorter time. 5 was made and experimented.

  The pressurization tank 5 is also provided with an air supply port 2 and an exhaust port 3, and after storing the battery 4, high pressure air is blown from the air supply port 2 so that the inside of the pressurization tank 5 and the battery 4 are kept in a predetermined state. The pressure is increased, and then the atmosphere can be released from the exhaust port 3. The exhaust port 3 is provided with a valve (not shown) so that the speed of pressure change when the atmosphere is released can be adjusted.

  For the measurement of the impregnation time, a 1.25 cc electrolyte solution was injected, pressure treatment was performed, the electrolyte solution was pushed in, the above operation was repeated three times, and after the last electrolyte solution injection, the pressure treatment was started. Then, the time until the liquid level of the electrolytic solution was impregnated in the electrode plate group and the liquid level could not be visually confirmed was measured.

  In the evaluation, the evaluation is performed with the improvement rate as before, but it has been confirmed that a measurement error of ± 5% is generated in this method. In the experiment, in order to change the pressure in a short time, the pressure was set to 0.5 MPa.

  FIG. 12A is a list of detailed experimental conditions and results, and FIG. 12B is a graph in which the horizontal axis represents the pressure holding time and the vertical axis represents the improvement rate. In the experiment, the time from the start of pressurization to the start of air release is set, and the pressurization holding time uses a value actually read from a pressure profile measured by a data logger.

  From this result, it can be seen that the impregnation property can be reliably improved when the pressure holding time is 0.05 sec or more. In addition, since the variation of about ± 5% is recognized in the improvement rate from the data of FIG. 12A, considering the variation, the improvement rate of 5% or more can be confirmed. When focusing on .70% and considering the graph of FIG. 12 (b) together, it is expected that even when the period is less than 0.05 sec, the one with the improvement rate of 0 is also generated. From the above, the limit value is set to 0.05 sec.

  In addition, it can be seen from FIG. 12B that the quantification rate becomes flat when the pressure holding time is 0.85 sec or more. From this, it can be said that it is desirable to set the pressure holding time to 0.85 sec in order to improve the impregnation property more efficiently. However, this experiment uses a cylindrical lithium ion secondary battery having an outer diameter of 18 mm and a length of 65 mm. If the battery has a larger size, the pressure inside the electrode plate group is sufficiently increased. It is necessary to provide a long pressure holding time.

  Finally, in the case of manufacturing by repeating the operation of pressurization and release to the atmosphere, the pressurization pressure is maintained for the pressurization holding time t0 from the pressurization step S2 in FIG. The impregnation property can be further improved by repeatedly performing the maintenance and starting the opening to the atmosphere.

  In the case of the second embodiment, as well as the case of the first embodiment, not only the pressure profile shown in FIG. 8 but any one of FIG. 9A, FIG. 9B, and FIG. It can also be implemented with a pressure profile. In this embodiment, the atmosphere is opened to the atmosphere, but the vacuum may be drawn at once, and the present invention is not limited to atmospheric pressure.

(Embodiment 3)
In each of the above embodiments, the method for manufacturing a battery has been described as an example, but the same effect can be obtained in a method for manufacturing a capacitor.

  Specifically, when a separator is interposed between electrode plates and the electrode plate group formed by laminating or winding in a laminated state is inserted into an outer case, a predetermined amount of electrolyte is injected to manufacture a capacitor. Before injecting the electrolytic solution, the inside of the outer case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and the time t [sec] required for opening to the atmosphere is expressed as “P / t ≧ 0. 5 [MPa / s] "by opening to the atmosphere so that the electrolyte solution can be immediately impregnated into the electrode plate group, and as a result, the gap between the electrode plate group wound at high density is widened, When injecting the electrolytic solution, the electrolytic solution can be immediately impregnated into the electrode plate group, and the amount of the electrolytic solution volatilized can be reduced. Preferably, the pressurization and release to the atmosphere are repeated a plurality of times. Further, as in the second embodiment, the impregnation property can be reliably improved when the pressure holding time t0 is 0.05 sec or more.

  The production method of the present invention can contribute to shortening the production time of a battery or a capacitor, and can contribute to the improvement of production efficiency in mass production.

S1 Case insertion process S2 Pressurization process S3 Atmospheric release process S4 Injection / impregnation process t0 Pressurization holding time t Time required for atmospheric release P Predetermined pressure

Claims (12)

When a battery is manufactured by injecting a predetermined amount of electrolyte after inserting an electrode plate group formed by interposing a separator between a positive electrode plate and a negative electrode plate and laminating or winding in a laminated state into a battery case,
Before injecting the electrolytic solution, the inside of the battery case in which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa], and then the time t [sec] required for opening to the atmosphere is
P / t ≧ 0.5 [MPa / s]
A method for manufacturing a battery that is opened to the atmosphere so that The method of manufacturing a battery according to claim 1, wherein the pressurization and release to the atmosphere are repeated a plurality of times. The method for manufacturing a battery according to claim 1, wherein the process from the pressurization to the air release is performed in a plurality of times, or the air release speed is changed during the process. When a battery is manufactured by injecting a predetermined amount of electrolyte after inserting an electrode plate group formed by interposing a separator between a positive electrode plate and a negative electrode plate and laminating or winding in a laminated state into a battery case,
Before injecting the electrolytic solution, pressurize the battery case in which the electrode plate group is inserted at a predetermined pressure P [MPa], and then set a time t [sec] required for opening to a pressure lower than the atmospheric pressure,
P / t ≧ 0.5 [MPa / s]
The manufacturing method of the battery open | released so that it may become. The method for manufacturing a battery according to claim 4, wherein the process of releasing the pressure from the pressure to a pressure lower than the atmospheric pressure is performed in a plurality of times or by changing the opening speed in the middle. The battery manufacturing method according to any one of claims 1 to 5, wherein a period during which the inside of the battery case into which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa] is 0.05 [sec] or more. . When manufacturing a capacitor by injecting a predetermined amount of electrolytic solution after inserting an electrode plate group formed by interposing a separator between electrode plates and laminating or winding in a laminated state into an outer case,
Before injecting the electrolytic solution, the inside of the outer case into which the electrode plate group has been inserted is pressurized at a predetermined pressure P [MPa], and then a time t [sec] required for opening to the atmosphere is
P / t ≧ 0.5 [MPa / s]
A capacitor manufacturing method that opens to the atmosphere so that The method for manufacturing a capacitor according to claim 7, wherein the pressurization and release to the atmosphere are repeated a plurality of times. The method for manufacturing a capacitor according to claim 7, wherein the process from the pressurization to the air release is performed in a plurality of times, or the air release speed is changed during the process. When manufacturing a capacitor by injecting a predetermined amount of electrolytic solution after inserting an electrode plate group formed by interposing a separator between electrode plates and laminating or winding in a laminated state into an outer case,
Before injecting the electrolytic solution, pressurize the inside of the outer case into which the electrode plate group is inserted at a predetermined pressure P [MPa], and set a time t [sec] required for opening to a pressure lower than atmospheric pressure.
P / t ≧ 0.5 [MPa / s]
A capacitor manufacturing method that opens so that The method for manufacturing a capacitor according to claim 10, wherein the process of releasing the pressure from the pressure to a pressure lower than the atmospheric pressure is performed in a plurality of times or by changing the opening speed in the middle. The method for manufacturing a capacitor according to any one of claims 7 to 11, wherein a period during which the inside of the outer case into which the electrode plate group is inserted is pressurized at a predetermined pressure P [MPa] is 0.05 [sec] or more. .

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