JP2007141774A - Manufacturing method of storage element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a power storage element having excellent characteristics and reliability of storage element by exhausting to the outside the gas generated in a housing container in manufacturing process, without discharging the electrolytic solution to the outside. <P>SOLUTION: The manufacturing method of the power storage element has a degassing process in which the gas in a housing case 110 is exhausted to the outside after applying a prescribed treating process to a temporary sealed battery 102 (temporary sealed storage element). The degassing process comprises an opening process in which the temporary sealed battery 102 is opened in the state that the atmospheric pressure (internal pressure in the chamber 10) around the battery 102 is made the atmospheric pressure wherein the electrolytic liquid is not discharged to the outside from the housing case 110 by the differential pressure with the battery 102 when the battery 102 is opened, and a gas exhaust process in which, after the temporary sealed battery 102 is opened, the gas in the housing case 110 is exhausted to the outside by gradually lowering the atmospheric pressure (internal pressure in the chamber 10) around the battery (storage element). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a power storage element, and more particularly, to a method for manufacturing a power storage element including a degassing step for discharging gas generated in a storage case during the manufacturing process to the outside of the storage case.

Conventionally, various methods for manufacturing a power storage element have been proposed. Recently, a method for manufacturing a power storage element including a degassing process for discharging the gas generated in the storage case during the manufacturing process to the outside of the storage case has been proposed. (For example, see Patent Documents 1 and 2).
JP 2001-283923 A JP 2003-187855 A

  In Patent Document 1, after the initial charging step and after the aging step, all or a part of the sealing portion of the housing case is opened, and the gas accumulated in the housing case is discharged to the outside. Thereafter, the inside of the storage case is evacuated and decompressed, and then the storage case is sealed again. Accordingly, it is described that the gas generated in the electricity storage element (battery) can be sufficiently discharged to the outside, and the electricity storage element having excellent characteristics and reliability of the electricity storage element (battery) can be manufactured. . Specifically, in the examples, a lithium ion secondary battery is manufactured by the above method.

  In Patent Document 2, winding is performed with a separator interposed between a cathode plate and an anode plate, and a jelly roll electrode assembly (a wound body including a cathode plate, an anode plate, and a separator) is manufactured. . Thereafter, the electrode assembly (rolled body) is initially charged without being housed in the housing case, and the gas generated during the charging is released. According to this, it is described that gas can be released simultaneously with initial charging, so that it is not necessary to separately provide a gas discharge step, the manufacturing process can be simplified, and productivity can be improved.

  By the way, in the method of Patent Document 1, there is no particular explanation about the method of opening the storage case when the gas accumulated in the storage case is discharged to the outside. Therefore, the storage case is opened at atmospheric pressure. It is thought that. However, since the internal pressure of the power storage element (battery) after initial charging and aging has greatly increased due to the generation of gas, when the storage case is opened under atmospheric pressure, the electrolyte is ejected to the outside together with the gas ( Leaked). For this reason, the trouble which wipes off the electrolyte solution adhering to a storage case arises, and there existed a possibility that sealing failure might arise under the influence of the electrolyte solution adhering to a sealing part.

  In Patent Document 2, although not described in detail, the electrode assembly (rolled body) is initially charged without being housed in the housing case. There is a possibility that the characteristics of the (battery) are greatly deteriorated. In particular, in the case of manufacturing a power storage element using a non-aqueous electrolyte (for example, a lithium ion secondary battery), the characteristics of the power storage element are greatly deteriorated due to moisture in the atmosphere, and thus cannot be applied. .

  The present invention has been made in view of the current situation, and without discharging the electrolyte solution to the outside, the gas generated in the housing case during the manufacturing process is discharged to the outside, and the characteristics and reliability of the storage element An object of the present invention is to provide a method capable of producing a power storage element having a good resistance.

  The solution includes a temporary sealing step of temporarily sealing a housing case containing an electrode body and an electrolytic solution to form a temporary sealed energy storage device, and a predetermined treatment step for the temporary sealed energy storage device. Then, the temporary sealing electricity storage element is opened, and a degassing step of discharging the gas in the housing case to the outside, the method of manufacturing the electricity storage element, wherein the degassing step includes the temporary sealing When the external pressure around the power storage element is opened, the electrolytic solution is released from the inside of the housing case due to a pressure difference from the internal pressure of the temporary sealed power storage element. An opening step of opening the temporarily sealed electricity storage element in a state where there is no external pressure, and after opening the temporarily sealed electricity storage element, gradually reducing the external air pressure around the electricity storage element, and And a gas discharge process for discharging the gas inside to the outside It is a method for producing a child.

  In the manufacturing method of the present invention, in the opening process, the external pressure around the temporarily sealed electricity storage element is determined by the pressure difference from the internal pressure of the temporarily sealed electricity storage element when the temporarily sealed electricity storage element is opened. The temporary sealing of the temporarily sealed power storage element is opened in a state where the external pressure is maintained so that the electrolytic solution is not released from the inside. Thereby, when the temporarily sealed power storage element is opened, it is possible to prevent a problem that the electrolytic solution is discharged from the inside of the housing case (specifically, the electrolytic solution is ejected or leaked). .

  Further, in the manufacturing method of the present invention, after the temporarily sealed power storage element is opened, in the gas discharge step, the external air pressure around the power storage element is gradually reduced to discharge the gas in the housing case to the outside. In this manner, by gradually reducing the external air pressure around the power storage element, the electrolyte in the storage case can be appropriately discharged to the outside without discharging the electrolyte from the storage case. .

  Therefore, according to the manufacturing method of the present invention, the gas generated in the housing case during the manufacturing process can be discharged to the outside without discharging the electrolyte solution to the outside. Can be manufactured.

  In addition, as a predetermined process process after a temporary sealing process and before a degassing process, a conditioning process, an aging process, etc. can be mentioned, for example. However, when the degassing process (first degassing process) is performed after the conditioning process and the degassing process (second degassing process) is performed after the aging process, the first degassing process is performed. After that, the housing case is temporarily sealed again.

In addition, the conditioning step refers to a step of performing a process for stabilizing the initial performance of the power storage element, and specifically, a step of performing a process such as repeated initial charging and charging / discharging.
Further, when the temporarily sealed electricity storage element is opened, the external pressure at which the electrolytic solution is not released to the outside due to the pressure difference from the internal pressure of the temporarily sealed electricity storage element is specifically, The external pressure is about the same as or higher than the internal pressure of the temporarily sealed power storage element.

  Note that the relationship between the internal pressure of the temporarily sealed energy storage element and the external pressure around the temporarily sealed energy storage element can be confirmed at the moment when the temporarily sealed energy storage element is opened. That is, when the housing case expands at the moment when the temporarily sealed energy storage element is opened, it is considered that the external pressure around the temporarily sealed energy storage element is higher than the internal pressure of the temporarily sealed energy storage element. Further, when the housing case is not deformed at the moment of opening the temporarily sealed electricity storage element, it is considered that the external pressure around the temporarily sealed electricity storage element is approximately the same as the internal pressure of the temporarily sealed electricity storage element. It is done.

The power storage element includes both a battery (for example, a lithium ion secondary battery and a nickel hydride secondary battery) and a capacitor (for example, an electric double layer capacitor).
Moreover, as an electrode body, when manufacturing a battery as an electrical storage element, the electrode body which consists of a positive electrode, a negative electrode, and a separator can be mentioned, for example. Moreover, when manufacturing a capacitor as an electrical storage element, the electrode body which consists of a 1st electrode, a 2nd electrode, and a separator can be illustrated.
Further, as the storage case, a storage case made of any material such as a laminate film, a metal, or a resin may be used.

  Furthermore, in the method for manufacturing the electricity storage device, in the opening step, the temporary sealed electricity storage device in a state where the external pressure around the temporarily sealed electricity storage device is equal to or higher than the internal pressure of the temporarily sealed electricity storage device. A method for manufacturing a power storage element in which the element is opened is preferable.

  By increasing the external air pressure around the temporarily sealed electricity storage element to be equal to or higher than the internal pressure of the temporarily sealed electricity storage element, the electrolyte is discharged from the storage case to the outside when the temporarily sealed electricity storage element is opened. Defects can be reliably prevented.

  Furthermore, in any of the above-described methods for manufacturing a power storage device, the predetermined treatment step includes a conditioning process for conditioning the temporary sealed power storage device, and the temporary sealed power storage device at a high temperature over a predetermined period. An aging step that is placed in an atmosphere, and the degassing step may be a method for manufacturing a power storage element that is performed after at least one of the conditioning step and the aging step.

  A large amount of gas is generated in the housing case particularly in the conditioning process and the aging process in the manufacturing process of the electric storage element. For this reason, the gas in a storage case can be discharged | emitted effectively by venting after at least any one of a conditioning process and an aging process like the manufacturing method of this invention.

  Furthermore, in any of the above-described methods for manufacturing a power storage element, the power storage element may be a method for manufacturing a lithium ion secondary battery that is a lithium ion secondary battery.

  Conventionally, in the production of lithium ion secondary batteries, there has been a problem that the electrolyte solution is ejected (leaked) together with the gas when degassing. On the other hand, according to the manufacturing method of the present invention, as described above, the gas generated in the housing case during the manufacturing process can be discharged to the outside without releasing the electrolyte solution to the outside. This makes it possible to manufacture a lithium ion secondary battery with good battery characteristics and reliability.

Next, Embodiments 1 and 2 of the present invention will be described with reference to the drawings.
Example 1
FIG. 1 is a plan view of the battery 100 (specifically, a lithium ion secondary battery) according to the first embodiment. As shown in FIG. 1, the battery 100 according to the first embodiment includes a storage case 110 having a rectangular shape in plan view, a positive electrode terminal 120 extending from the inside of the storage case 110 to the outside, and from the inside of the storage case 110 to the outside. And a negative electrode terminal 130 extending.

  Further, as shown in FIG. 2, an electrode body 150 is accommodated inside the accommodation case 110. The electrode body 150 is an oblong cross-section, and is a flat wound body formed by winding a belt-like positive electrode 155, a negative electrode 156, and a separator 157. Among these, the positive electrode 155 is not shown, but in the positive electrode connection portion 155b located at one end thereof (the uncoated portion where the positive electrode mixture containing the positive electrode active material is not applied, the left end portion in FIG. 2). The positive electrode terminal 120 is welded. The negative electrode 156 is welded to the negative electrode terminal 130 at a negative electrode connection portion 156b located at one end thereof (an uncoated portion where the negative electrode mixture containing the negative electrode active material is not applied, the right end portion in FIG. 2). ing.

  The storage case 110 includes an inner resin film 111 positioned on the innermost side of the storage case 110, a metal film 112 positioned adjacent to the outer side of the inner resin film 111, and an outer side positioned adjacent to the outer side of the metal film 112. It is formed of a laminate film 101 in which a resin film 113 is laminated. As shown in FIG. 2, the storage case 110 is formed by laminating the laminate film 101 in which the electrode body 150 is disposed in the storage portion 119 at a turn-back position 110g. As shown in FIG. The stop part 115 (peripheral part of the housing case 110) is sealed by heat welding and formed into a rectangular shape in plan view.

Next, a method for manufacturing the battery 100 of the first embodiment will be described.
First, an electrode mixture containing a different active material (a positive electrode mixture and a negative electrode mixture) is applied to two types of metal sheets to produce strip-shaped positive electrodes 155 and negative electrodes 156. Next, a positive electrode 155, a negative electrode 156, and a separator 157 are stacked and wound to form a flat wound electrode body 150. When the positive electrode 155, the negative electrode 156, and the separator 157 are stacked, the positive electrode 155 has an uncoated portion that is not coated with the positive electrode mixture, protruding from one end portion of the electrode body 150. 155 is arranged. Furthermore, the negative electrode 156 is disposed so that an uncoated portion of the negative electrode 156 that is not coated with the negative electrode mixture protrudes from the side opposite to the uncoated portion of the positive electrode 155. Thereby, as shown in FIG. 2, the electrode body 150 having the positive electrode connecting portion 155b and the negative electrode connecting portion 156b is formed.

  Next, the positive electrode connection part 155b of the electrode body 150 and the positive electrode terminal 120 are connected. Specifically, for example, the positive electrode connection portion 155b and the positive electrode terminal 120 are connected by welding (for example, ultrasonic welding, spot welding) in a state where the positive electrode connection portion 155b and the positive electrode terminal 120 are pressure-bonded. Similarly, the negative electrode connection part 156b of the electrode body 150 and the negative electrode terminal 130 are connected. Specifically, for example, the negative electrode connection portion 156b and the negative electrode terminal 130 are connected by welding (for example, ultrasonic welding or spot welding) in a state where the negative electrode connection portion 156b and the negative electrode terminal 130 are pressure-bonded.

  Separately, a laminate film 101 is prepared. Specifically, after laminating the inner resin film 111, the metal film 112, and the outer resin film 113, this is press-molded to obtain a laminate film 101 in which the housing portion 119 is recessed (see FIG. 2). Next, as illustrated in FIG. 2, the electrode body 150 in which the positive electrode terminal 120 and the negative electrode terminal 130 are welded is disposed in the accommodating portion 119 of the laminate film 101. Next, the laminate film 101 is folded at the folding position 110g, and the electrode body 150 is accommodated therein (see FIG. 3).

  Next, as shown in FIG. 3, a portion of the welded sealing portion 115 excluding the inlet 116 into which the electrolytic solution is to be injected later (the portion marked with a dot in FIG. 3) is heated while being pressurized in the thickness direction. Then, the inner resin films 111 are thermally welded together. Thereby, the electrode body 150 can be accommodated inside the positive electrode terminal 120 and the negative electrode terminal 130 while extending from the inside of the housing case 110 to the outside. Next, an electrolytic solution is injected into the housing case 110 through the liquid injection port 116.

Next, the process proceeds to the first temporary sealing step, and as shown in FIG. 4, the temporary sealing member 117 made of polypropylene is thermally welded to the upper side portion 118 b of the protruding portion 118 of the housing case 110, thereby injecting the liquid inlet. 116 is closed. Accordingly, the temporarily sealed battery 102 can be formed by temporarily sealing the housing case 110 containing the electrode body 150 and the electrolytic solution.
Next, the process proceeds to a conditioning process, and a process for stabilizing the initial performance of the battery 100 is performed. Specifically, the temporarily sealed battery 102 was initially charged, and charging / discharging was repeated a predetermined number of times.

Next, it progressed to the 1st degassing process, the temporary sealing battery 102 was opened, and the gas in the storage case 110 was discharged | emitted outside.
Specifically, first, as shown in FIG. 5, the temporarily sealed battery 102 is disposed in the chamber 10 having the gas introduction path 11 and the gas discharge path 12. Next, in a state where the gas discharge path 12 is closed, a dry gas is introduced into the chamber 10 through the gas introduction path 11 by using a pressure pump (not shown), whereby the internal pressure of the chamber 10 (that is, the temporarily sealed battery 102 Increase ambient ambient pressure). Then, in the state where the internal pressure of the chamber 10 (the external pressure around the temporary sealing battery 102) is equal to or higher than the internal pressure of the temporary sealing battery 102, the introduction of the dry gas into the chamber 10 is stopped, and the gas introduction path 11 is closed.

  Next, the process proceeds to an opening step, and as shown in FIG. 6, the temporarily sealed battery is maintained in a state in which the internal pressure of the chamber 10 (the external pressure around the temporarily sealed battery 102) is kept higher than the internal pressure of the temporarily sealed battery 102. 102 was opened. Specifically, the temporary sealing member 117 was cut out together with the upper portion 118 b of the protruding portion 118 of the housing case 110.

  In the opening process of Example 1, at the moment when the temporarily sealed battery 102 was opened, the storage case 110 was slightly expanded, and neither gas ejection nor electrolyte discharge occurred from the storage case 110. . Thereby, when opening the temporary sealing battery 102, the internal pressure of the chamber 10 (the external pressure around the temporary sealing battery 102) is higher than the internal pressure of the temporary sealing battery 102 (specifically, the temporary sealing battery 102). It was confirmed that the pressure was slightly higher than the internal pressure of 102).

  As described above, in Example 1, the external pressure around the temporary sealing battery 102 is set to be equal to or higher than the internal pressure of the temporary sealing battery 102 (specifically, the external atmospheric pressure around the temporary sealing battery 102 is The temporarily sealed battery 102 is opened in a state slightly higher than the internal pressure of the temporarily sealed battery 102. Thereby, when the temporary sealing battery 102 was opened, the malfunction that electrolyte solution was discharged | emitted from the inside of the storage case 110 was able to be prevented.

Next, the process proceeds to a gas discharge step, and as shown in FIG. 7, the dry gas in the chamber 10 is gradually discharged to the outside through the gas discharge path 12, so that the internal pressure of the chamber 10 (that is, the temporary sealing battery 102 The ambient external pressure is gradually reduced to atmospheric pressure. As a result, the gas in the storage case 110 could be appropriately discharged to the outside through the liquid injection port 116 without the electrolyte solution being discharged from the storage case 110 to the outside.
In addition, in the 1st degassing process (opening process and gas discharge process) of Example 1, since discharge | release to the exterior of electrolyte solution was prevented, electrolyte solution does not adhere to the outer surface of the storage case 110. It was. For this reason, the trouble of wiping off the electrolytic solution could be saved.

  Next, the process proceeds to the second temporary sealing step, and the temporary sealing member 117 made of polypropylene is thermally welded to the lower side portion 118c of the protruding portion 118 of the housing case 110 in the same manner as the first temporary sealing step described above. As a result, the liquid injection port 116 was closed to form the temporarily sealed battery 102 (see FIG. 4). Next, proceeding to an aging process, the temporarily sealed battery 102 was placed in a temperature-controlled room maintained at a high temperature atmosphere of about 50 ° C. for a predetermined period.

Next, the process proceeds to the second degassing step, and after the temporary sealing battery 102 is opened in the unsealing step in the same manner as the first degassing step, the gas in the housing case 110 is discharged to the outside in the gas discharging step. (See FIGS. 5 to 7). Next, the container case 110 is sealed by closing the liquid injection port 116 by thermal welding, and then a predetermined process is performed, whereby the battery 100 shown in FIG. 1 is completed.
In the second degassing step (opening step and gas discharge step) of the first embodiment, it was possible to prevent the electrolyte from being discharged to the outside, so that the electrolyte was supplied to the outer surface of the housing case 110 and the liquid inlet 116. Can be prevented. For this reason, the trouble of wiping off the electrolytic solution can be saved, and the sealing failure of the liquid injection port 116 by the electrolytic solution can be prevented.

(Example 2)
Next, the capacitor 200 according to the second embodiment and the manufacturing method thereof will be described. The capacitor 200 according to the second embodiment is different from the battery 100 according to the first embodiment in the electrode body and the electrolytic solution, and is otherwise substantially the same. Therefore, here, the description will focus on the points different from the first embodiment, and the description of the same points will be omitted or simplified.

  As shown in FIG. 8, the capacitor 200 (specifically, an electric double layer capacitor) of the second embodiment includes a storage case 110 similar to that of the first embodiment, and a first extension extending from the inside of the storage case 110 to the outside. A first electrode terminal 220 and a second electrode terminal 230 are provided.

  Furthermore, as shown in FIG. 9, an electrode body 250 is accommodated in the accommodation case 110. This electrode body 250 is an oblong cross-section, and is a flat wound body formed by winding a first electrode 255, a second electrode 256, and a separator 257 having a strip shape. Among these, the 1st electrode 255 is welded to the 1st electrode terminal 220 in the 1st electrode connection part 255b located in the one end part (left end part in FIG. 9). Further, the second electrode 256 is welded to the second electrode terminal 230 at the second electrode connection portion 256b located at one end portion thereof (the right end portion in FIG. 9).

Such a capacitor 200 of the second embodiment is manufactured as follows.
First, in the same manner as in the first embodiment, the strip-shaped first electrode 255, the second electrode 256, and the separator 257 are stacked and wound to form a flat wound electrode body 250. Next, in the same manner as in the first embodiment, the first electrode terminal 220 is welded to the first electrode connection portion 255b of the electrode body 250, and the second electrode terminal 230 is welded to the second electrode connection portion 256b.

  Next, as shown in FIG. 9, the electrode body 250 is housed in the housing portion 119 of the laminate film 101 in the same manner as in the first embodiment. Thereafter, as shown in FIG. 3, in the same manner as in Example 1, a portion of the welded sealing portion 115 excluding the injection port 116 for injecting an electrolyte later (a portion indicated by hatching in FIG. 3) has its thickness. The inner resin films 111 are heat-welded by heating while pressing in the direction. Next, an electrolytic solution is injected into the housing case 110 through the liquid injection port 116.

Next, the process proceeds to the temporary sealing step, and as shown in FIG. 4, the temporary sealing member 117 made of polypropylene is thermally welded to the protruding portion 118 of the housing case 110 in the same manner as in the first embodiment. The liquid port 116 is closed. Accordingly, the temporary sealing capacitor 202 can be formed by temporarily sealing the housing case 110 containing the electrode body 250 and the electrolytic solution.
Next, the process proceeds to a conditioning process, and a process for stabilizing the initial performance of the capacitor 200 is performed. Specifically, the temporary sealing capacitor 202 was repeatedly charged and discharged a predetermined number of times.

  Next, the process proceeds to a degassing process, and after opening the temporary sealing capacitor 202 in the opening process in the same manner as in Example 1, the gas in the housing case 110 is discharged to the outside in the gas discharging process (FIGS. 5 to 5). 7). Even in the opening process of the second embodiment, as in the first embodiment, the temporary atmospheric pressure around the temporary sealing capacitor 202 (the internal pressure of the chamber 10) is set to be equal to or higher than the internal pressure of the temporary sealing capacitor 202. Since the sealed capacitor 202 was opened, it was possible to prevent a problem that the electrolytic solution was discharged from the housing case 110 to the outside when the temporarily sealed capacitor 202 was opened. Further, in the gas discharge process of the second embodiment, as in the first embodiment, the internal pressure of the chamber 10 (that is, the external pressure around the temporary sealing battery 102) was gradually reduced to the atmospheric pressure. The electrolyte in the storage case 110 could be appropriately discharged to the outside through the liquid injection port 116 without the electrolytic solution being discharged from the storage case 110 to the outside.

Next, the container case 110 is sealed by closing the liquid injection port 116 by thermal welding, and then a predetermined process is performed, whereby the capacitor 200 shown in FIG. 8 is completed.
In the manufacture of the capacitor 200 of the second embodiment, when the aging process is performed, it is preferable to provide a degassing process (second degassing process) after the aging process as in the first embodiment. This is because the gas generated in the housing case 110 in the aging process can be appropriately discharged to the outside.

In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the above-described embodiments, and it can be applied as appropriate without departing from the scope of the present invention. Nor.
For example, in Example 1, the degassing process (first degassing process) was performed after the conditioning process, and the degassing process (second degassing process) was performed after the aging process. However, the degassing process may be performed only after the conditioning process or only after the aging process.

  In the battery 100 of Example 1, a wound electrode body 150 formed by winding a strip-like positive electrode 155, a negative electrode 156, and a separator 157 was used as the electrode body. Similarly, in the capacitor 200 of Example 2, the wound electrode body 250 formed by winding the strip-shaped first electrode 255, the second electrode 256, and the separator 257 was used as the electrode body. However, the structure of the electrode body is not limited to the wound type, and may be any structure such as a laminated type in which a plate-like positive electrode (first electrode), a negative electrode (second electrode), and a separator are laminated.

  In Examples 1 and 2, a storage element (battery, capacitor) was manufactured using a storage case 110 made of a laminate film. However, a storage case made of any material such as metal or resin may be used. good. Regardless of the storage case made of any material, according to the manufacturing method (gas venting process) of the present invention, the gas generated in the storage case during the manufacturing process is discharged to the outside without releasing the electrolyte. can do. Therefore, a power storage element with favorable characteristics and reliability of the power storage element can be manufactured.

1 is a plan view of a battery 100 according to Example 1. FIG. It is a top view which shows the mode before laminating | stacking the laminate film 101 concerning Example 1. FIG. It is a top view which shows a mode when the laminate film 101 is piled up. 3 is a plan view of a temporary sealing battery 102 and a temporary sealing capacitor 202. FIG. It is explanatory drawing explaining a degassing process. It is explanatory drawing explaining a degassing process (opening process). It is explanatory drawing explaining a degassing process (gas discharge process). 6 is a plan view of a capacitor 200 according to Example 2. FIG. It is a top view which shows the mode before laminating | stacking the laminate film 101 concerning Example 2. FIG.

Explanation of symbols

100 battery (storage element)
200 Capacitor (storage element)
102 Temporary sealing battery (temporary sealing storage element)
202 Temporary sealing capacitor (temporary sealing storage element)
101 Laminated film 110 Housing case 150, 250 Electrode body

Claims (4)

Temporary sealing step of temporarily sealing the housing case containing the electrode body and the electrolytic solution to form a temporarily sealed energy storage device;
A degassing step of opening the temporary sealed electricity storage element after the predetermined treatment step is performed on the temporarily sealed electricity storage element and discharging the gas in the housing case to the outside;
A method of manufacturing a storage element comprising:
The degassing step is
When the external pressure around the temporarily sealed electricity storage element is opened, the electrolytic solution is discharged from the inside of the housing case due to a pressure difference from the internal pressure of the temporarily sealed electricity storage element. An unsealing step for unsealing the temporarily sealed power storage element in a state where the external pressure is not applied,
A gas discharge step of, after opening the temporarily sealed power storage element, gradually reducing the external air pressure around the power storage element and discharging the gas in the housing case to the outside. It is a manufacturing method of the electrical storage element according to claim 1,
In the opening step,
A method for manufacturing a power storage element, wherein the temporarily sealed power storage element is opened in a state where an external pressure around the temporarily sealed power storage element is equal to or higher than an internal pressure of the temporary sealed power storage element. It is a manufacturing method of the electrical storage element according to claim 1 or 2,
As the predetermined processing step,
A conditioning process for conditioning the temporarily sealed electricity storage element;
An aging step of placing the temporarily sealed electricity storage element in a high temperature atmosphere for a predetermined period,
The degassing step includes
A method for manufacturing a power storage element that is performed after at least one of the conditioning process and the aging process. It is a manufacturing method of the electrical storage element according to any one of claims 1 to 3,
The said electrical storage element is a manufacturing method of the lithium ion secondary battery which is a lithium ion secondary battery.

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