JP2013084480A - Method of manufacturing battery - Google Patents

Abstract

To provide a battery manufacturing method capable of easily and reliably inspecting airtightness between an outer sealing member and a battery case in a battery including an outer sealing member that hermetically seals a through hole.
A method of manufacturing a battery includes a temporary sealing step in which a rubber plug member is press-fitted into a through-hole and temporarily sealed in an airtight manner, and then the rubber plug member is sealed by an outer sealing member. The main sealing step of fixing the outer sealing member 180x to the hole peripheral portion 113m of the battery case 110 in an airtight and annular manner while covering from the outside, and then pressing and deforming the outer sealing member 180x from the outside to deform the rubber plug A temporary sealing release step of releasing the temporary sealing by the member 190 and allowing the gas to flow through the through hole 170.
[Selection] Figure 5

Description

  The present invention includes a battery case having a through-hole communicating with the inside and outside of the battery case, an electrode body housed in the battery case, and a sealing member formed by sealing the through-hole of the battery case from the outside. The present invention relates to a battery manufacturing method.

Conventionally, a battery case having a through hole such as a liquid injection hole for injecting an electrolytic solution, an electrode body accommodated in the battery case, and a sealing in which the through hole of the battery case is hermetically sealed from the outside A battery including a member is known. As the sealing member, for example, there is a member in which a rubber plug member made of a rubber-like elastic body is joined to a metal lid member made of metal. Among these, the rubber plug member is press-fitted into the through hole of the battery case from the outside, and the through hole is hermetically sealed (tightly plugged). On the other hand, the metal lid member is bonded to the battery case in a state where the rubber plug member is pressed toward the inside of the battery case while covering the rubber plug member from the outside of the battery case. By doing in this way, the airtight sealing of the through-hole by a rubber plug member can be made more reliable.
In addition, as a battery of the form which sealed the through-hole with the sealing member which has such a metal lid member and a rubber plug member, the battery disclosed by patent document 1 is mentioned, for example.

JP 2009-87659 A

  In the conventional battery, as described above, it was considered that the hermetic sealing of the through hole should be performed by the rubber plug member. Therefore, strictly speaking, the airtightness between the metal lid member and the battery case is strictly required. There wasn't. However, since the rubber plug member made of a rubber-like elastic material deteriorates with time, the airtightness between the rubber plug member and the through hole also decreases with time. In particular, in-vehicle batteries such as hybrid vehicles and electric vehicles are used for a long period of time, for example, 10 years or more, and there is a concern that the airtightness may decrease due to the deterioration with time.

  When the rubber plug member deteriorates and the airtightness between the rubber plug member and the through hole is reduced, the electrolyte contained in the battery case enters between the rubber plug member and the through hole, and further, the metal When the airtightness between the lid member and the battery case is low, the electrolyte may leak to the outside of the battery through between the metal lid member and the battery case. As a result, the electrolyte in the battery case is insufficient, and the battery characteristics may deteriorate. Conversely, moisture in the atmosphere may enter the battery case between the metal lid member and the battery case, and between the rubber plug member and the through hole, and the battery characteristics may deteriorate.

In order to solve this problem, even if the rubber plug member deteriorates and the airtightness between the rubber plug member and the through hole is reduced, the metal lid member and the battery case are prevented from communicating with each other. It is conceivable to ensure airtight and annular bonding between the two.
However, in such a battery, the rubber plug member has not yet deteriorated immediately after manufacture, and the gap between the rubber plug member and the through hole is hermetically sealed. That is, this battery is double-sealed by the close contact between the rubber plug member and the through hole and the joining of the metal lid member and the battery case. For this reason, even if a sealing failure occurs due to a failure in joining the metal lid member and the battery case, it is difficult to determine the battery in which the sealing failure has occurred by inspection.

  The present invention has been made in view of such a situation, and covers the through hole of the battery case from the outside, and is airtightly and annularly fixed around the hole of the battery case, and the through hole is hermetically sealed. An object of the present invention is to provide a battery manufacturing method capable of easily and reliably inspecting airtightness between an outer sealing member and a battery case in a battery including the outer sealing member.

  One aspect of the present invention for solving the above problem is that a battery case having a through hole communicating inside and outside of the battery, an electrode body accommodated in the battery case, and the through hole from the outside of the battery case. A battery manufacturing method comprising: an outer sealing member that covers and seals the through hole in an airtight and annularly fixed manner around the annular hole surrounding the through hole in the battery case. A temporary sealing step in which a rubber plug member made of a rubber-like elastic body is press-fitted into the through hole from the outside of the battery case, and the through hole is temporarily sealed with the rubber plug member; After the temporary sealing step, the outer sealing member is covered with the outer sealing member from the outside, and the outer sealing member is hermetically and annularly fixed to the hole peripheral portion of the battery case. And after the main sealing step, the outer sealing member Temporary sealing release that allows the gas to flow through the through hole by pressing and deforming from the outside, deforming or moving the rubber plug member directly or indirectly with the outer sealing member, releasing the temporary sealing. And a process for producing a battery.

  In this battery manufacturing method, in the temporary sealing step, the through hole is temporarily sealed airtight with a rubber plug member. For this reason, it is possible to prevent the electrolyte contained in the battery case from leaking to the outside of the battery case (such as around the hole) through the through-hole before the main sealing step. Therefore, during the main sealing step, it is possible to prevent the electrolyte leaking from the through hole from entering between the outer sealing member and the hole peripheral portion of the battery case, resulting in a sealing failure. The member and the hole periphery can be securely fixed.

  Furthermore, in this battery manufacturing method, in the temporary sealing release step, the temporary sealing by the rubber plug member is canceled to allow gas to flow through the through hole. For this reason, in the battery after this temporary sealing release process, the airtightness between the outer sealing member and the battery case (the peripheral part of the hole) can be easily and reliably inspected. That is, by inspecting whether the gas in the battery case does not leak out of the battery, the airtightness between the outer sealing member and the battery case can be easily and reliably inspected. And the battery in which the sealing defect has arisen among these can be excluded reliably.

In the “temporary seal releasing step”, as a specific method for releasing the temporary seal, for example, a portion such as a needle-like protrusion or an extension that extends toward the through hole is provided on the outer sealing member. There is a method of releasing the temporary sealing by providing the outer sealing member from the outside and deforming or moving the rubber plug member directly at this portion in the temporary sealing releasing step.
Further, for example, the rubber plug member is provided with a portion such as an extending portion extending toward the outer sealing member, and the outer sealing member is pressed and deformed from the outside in the temporary sealing release step, and the outer sealing member The method of releasing this temporary seal | sticker by pushing this site | part and moving a rubber plug member is mentioned.

Further, for example, the outer sealing member is provided with an extending portion or the like extending toward the through hole, and the rubber plug member is provided with an extending portion or the like extending toward the outer sealing member. In this method, the outer sealing member is pressed and deformed from the outside, the extension portion of the rubber plug member is pushed by the extension portion of the outer sealing member, the rubber plug member is moved, and the temporary sealing is released. Is mentioned.
Further, for example, between the outer sealing member and the rubber plug member, another member (intermediate member) which is a member different from these is disposed before the main sealing, and the temporary sealing release step In the method, the outer sealing member is pressed and deformed from the outside, the intermediate member is pushed by the outer sealing member, the rubber plug member is deformed or moved by the intermediate member, and the temporary sealing is released.

  Furthermore, it is good to set it as the manufacturing method of said battery, Comprising: The said manufacturing method of a battery provided with the cancellation | release confirmation process which confirms that the said temporary sealing is cancelled | released about the through-hole after the said temporary sealing cancellation | release process. .

In this battery manufacturing method, the release confirmation step is performed to confirm that the temporary sealing by the rubber plug member is released, so that the airtightness inspection between the outer sealing member and the battery case is more reliably performed. Can be done.
In addition, as a specific method for confirming the release of the temporary seal, for example, through the X-ray fluoroscopic inspection such as the X-ray CT inspection, it is confirmed through the inside of the battery that the temporary seal is released. A method is mentioned. For example, when the rubber plug member is dropped into the battery case in the temporary sealing release process, the battery is swung in the release confirmation process, and the rubber plug member is caused to collide with the battery case or the like to generate a collision sound. Accordingly, it is possible to confirm the release of the temporary sealing.

Furthermore, in the battery manufacturing method, the battery manufacturing method includes an airtight inspection step of inspecting an airtightness between the outer sealing member and the hole peripheral portion of the battery case after the release confirmation step. It would be better to do it.
Or it is a manufacturing method of the said battery, Comprising: The battery provided with the airtight test process which test | inspects the airtightness between the said outer side sealing member and the said hole surrounding part of the said battery case after the said temporary sealing cancellation | release process. It is good to use this manufacturing method.

  In these battery manufacturing methods, since the airtightness between the outer sealing member and the periphery of the hole of the battery case is inspected in the airtightness inspection step, it is possible to reliably protect the battery in which a sealing failure has occurred between them. Can be eliminated. Therefore, a battery in which the airtightness between the outer sealing member and the battery case is easily and reliably inspected can be manufactured.

  Furthermore, in the method for manufacturing a battery according to any one of the above, the outer sealing member has a needle-like protrusion that extends toward the through-hole and has a pointed tip, and the temporary sealing member In the sealing release step, the needle-like protrusion is moved toward the through hole in accordance with the pressure deformation of the outer sealing member, and the inside and outside of the battery case is moved to the rubber plug member by the needle-like protrusion. A method for manufacturing a battery, which is a step of forming a communication hole that communicates, is preferable.

  In this battery manufacturing method, a needle-like protrusion is provided on the outer sealing member, and a communication hole is formed in the rubber plug member by this needle-like protrusion, so that the temporary sealing can be easily and reliably released. it can. Therefore, the airtightness test between the outer sealing member and the battery case can be reliably performed.

  Furthermore, in the method for manufacturing a battery according to any one of the above, the outer sealing member has an extending portion extending toward the through hole, and the temporary sealing release step includes the outer sealing member. When the battery manufacturing method is a step of moving the extension part toward the through hole in accordance with the pressing deformation of the sealing member and dropping the rubber plug member into the battery case at the extension part. good.

  In this battery manufacturing method, an extending portion is provided in the outer sealing member, and the rubber plug member is dropped into the battery case at the extending portion, so that the temporary sealing can be easily and reliably released. it can. Therefore, the airtightness test between the outer sealing member and the battery case can be reliably performed.

  Furthermore, in the battery manufacturing method according to any one of the above, the temporary sealing step is performed under reduced pressure, and the main sealing step is preferably a battery manufacturing method performed under atmospheric pressure. .

  By performing the temporary sealing step under reduced pressure, the inside of the battery case after the temporary sealing can be brought into a reduced pressure state (negative pressure). For this reason, in the conditioning process (initial charge) performed after the main sealing process or in the subsequent use, even if gas is generated in the battery case, it is possible to prevent the internal pressure of the battery case from increasing early. On the other hand, since the main sealing step for performing welding or the like is performed under atmospheric pressure, the main sealing step can be easily performed as compared with the case where the main sealing step is performed under reduced pressure.

1 is a longitudinal sectional view showing a lithium ion secondary battery according to Embodiment 1. FIG. 1 is a perspective view showing an electrode body according to Embodiment 1. FIG. FIG. 3 is a partial plan view illustrating a state in which the positive electrode plate and the negative electrode plate are overlapped with each other via a separator according to the first embodiment. FIG. 3 is an exploded perspective view illustrating a case lid member, a positive electrode terminal, a negative electrode terminal, and the like according to the first embodiment. FIG. 4 is a partially enlarged longitudinal sectional view showing the vicinity of a liquid injection hole and an outer sealing member according to the first embodiment. It is explanatory drawing which shows a mode that the liquid injection hole is airtightly temporarily sealed with a rubber stopper member in the temporary sealing process regarding the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1. FIG. It is explanatory drawing which shows a mode that an outer side sealing member is airtightly welded cyclically | annularly to the hole surrounding part of a battery case in this sealing process regarding the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1. FIG. FIG. 6 is a partially enlarged longitudinal sectional view showing the vicinity of a liquid injection hole and an outer sealing member according to the second embodiment. It is explanatory drawing which shows a mode that the liquid injection hole is airtightly sealed with a rubber plug member in a temporary sealing process regarding the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 2. FIG. It is explanatory drawing which shows a mode that an outer side sealing member is airtightly welded cyclically | annularly to the hole surrounding part of a battery case in this sealing process regarding the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 2. FIG. It is explanatory drawing which shows a mode that a temporary sealing process is performed about the manufacturing method of the lithium ion secondary battery which concerns on the modification 1, and a main sealing process is performed after that, and an outer side sealing member is welded to a battery case. FIG. 6 is an explanatory view showing a state of releasing temporary sealing by a rubber plug member by pressing and deforming the outer sealing member from the outside in a temporary sealing release step, with respect to the method for manufacturing a lithium ion secondary battery according to Modification 1; It is. It is explanatory drawing which shows a mode that the temporary sealing process is performed about the manufacturing method of the lithium ion secondary battery which concerns on the modification 2, and this sealing process is performed after that, and an outer side sealing member is welded to a battery case. FIG. 7 is an explanatory view showing a state of releasing temporary sealing by a rubber plug member by pressing and deforming an outer sealing member from the outside in a temporary sealing release step, with respect to a method for manufacturing a lithium ion secondary battery according to Modification 2; It is. With respect to the method for manufacturing a lithium ion secondary battery according to Modification 3, after the temporary sealing step, an intermediate member is disposed on the rubber plug member, and then the main sealing step is performed, so that the outer sealing member is used as the battery case. It is explanatory drawing which shows a mode that it welds. FIG. 7 is an explanatory view showing a state of releasing temporary sealing by a rubber plug member by pressing and deforming the outer sealing member from the outside in a temporary sealing release step, with regard to the method for manufacturing a lithium ion secondary battery according to Modification 3; It is. Regarding the method for manufacturing a lithium ion secondary battery according to the modified embodiment 4, after the temporary sealing step, an intermediate member is disposed on the rubber plug member, and then the main sealing step is performed, so that the outer sealing member is used as the battery case. It is explanatory drawing which shows a mode that it welds. FIG. 7 is an explanatory view showing a state of releasing the temporary sealing by the rubber plug member by pressing and deforming the outer sealing member from the outside in the temporary sealing releasing step with respect to the method for manufacturing the lithium ion secondary battery according to the modified embodiment 4; It is.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a lithium ion secondary battery (battery) 100 (hereinafter also simply referred to as battery 100) according to the first embodiment. 2 and 3 show a wound electrode body 120 constituting the battery 100 and a state in which the electrode body 120 is developed. FIG. 4 shows details of the case lid member 113, the positive terminal 150, the negative terminal 160, and the like. FIG. 5 shows a configuration in the vicinity of the liquid injection hole (through hole) 170 and the outer sealing member 180. 1, 4, and 5, the upper side is the upper side of battery 100, and the lower side is the lower side of battery 100.

  The battery 100 is a square battery that is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, or a battery-powered device such as a hammer drill. The battery 100 includes a rectangular parallelepiped battery case 110, a wound electrode body 120 accommodated in the battery case 110, a positive electrode terminal 150 and a negative electrode terminal 160 supported by the battery case 110 ( (See FIG. 1). In addition, a non-aqueous electrolyte solution 117 is held in the battery case 110.

  Of these, the battery case 110 is made of metal (aluminum in the first embodiment). The battery case 110 includes a box-shaped case main body member 111 that is open only on the upper side, and a case lid member 113 that is welded so as to close the opening 111h of the case main body member 111 (see FIG. 1 and FIG. 1). (See FIG. 4). The case lid member 113 has a rectangular plate shape having an inner surface 113 c that is a main surface facing the inside of the battery case 110 and an outer surface 113 d that is a main surface facing the outside of the battery case 110.

  The case lid member 113 is provided with a non-returnable safety valve 115 that breaks when the internal pressure of the battery case 110 reaches a predetermined pressure near the center in the longitudinal direction. Further, near the safety valve 115, a liquid injection hole (through hole) 170, which will be described later, is provided through the case lid member 113 and communicating between the inside and outside of the battery case 110. The liquid injection hole 170 is hermetically sealed with an outer sealing member 180 described later in a state where the inside of the battery case 110 is depressurized from the atmospheric pressure (negative pressure state). Further, the case lid member 113 includes a positive electrode terminal 150 and a negative electrode terminal 160 that are each configured to extend from the inside of the battery case 110 to the outside, and bolts 153 and 153 that are insulating members made of resin. 155 and 155 (see FIGS. 1 and 4).

  Moreover, the electrode body 120 is accommodated in the insulating film enclosure 119 which formed the insulating film in the bag shape which only the upper side opened, and is accommodated in the battery case 110 in the state of lying down (refer FIG. 1). The electrode body 120 includes a strip-like positive electrode plate 121 in which positive electrode active material layers 123 and 123 are formed on both main surfaces of the positive electrode current collector foil 122, and a negative electrode active material layer 133 on both main surfaces of the negative electrode current collector foil 132. The strip-shaped negative electrode plate 131 formed with 133 is overlapped with each other via strip-shaped separators 141 and 141 made of a porous film (see FIG. 3), wound around the axis AX, and compressed into a flat shape. Yes (see FIG. 2). A part of the positive electrode plate 121 in the width direction protrudes in a spiral shape from the separator 141 to one side AC in the axis AX direction (see FIG. 2), and is connected to the positive electrode terminal 150 (see FIG. 1). ). Further, a part of the negative electrode plate 131 in the width direction protrudes from the separator 141 to the other side AD in the axis AX direction in a spiral shape (see FIG. 2), and is connected to the negative electrode terminal 160 (see FIG. 2). 1).

Next, the recessed part 175, the injection hole 170, the outer side sealing member 180, and the rubber stopper member 190 are demonstrated (refer FIG. 5).
The recess 175 is a circular recess in plan view that is recessed from the outer surface 113 d of the case lid member 113 toward the inner surface 113 c (downward in FIG. 5). The recess 175 includes a cylindrical recess side surface 175f1 and a recess bottom surface 175f2 forming a plane extending in parallel with the inner surface 113c.

  The liquid injection hole 170 is used for injecting the electrolytic solution 117 into the battery case 110 and penetrates between the concave bottom surface 175f2 of the concave portion 75 and the inner surface 113c of the case lid member 113, and is formed at the center of the concave bottom surface 175f2. The circular hole is provided to communicate the inside and outside of the battery case 110. The liquid injection hole 170 includes a cylindrical hole side surface 170f.

The outer sealing member 180 is made of the same material as that of the battery case 110, specifically, aluminum, and includes a cap portion 181 and a needle-like protrusion 183.
Of these, the cap portion 181 is made of a metal plate (aluminum plate) having an inner surface 181c which is a main surface located on the liquid injection hole 170 and the concave portion 175 side and an outer surface 181d which is a main surface located on the battery outer side. It has a form bent in a complicated manner by pressing deformation (buckling) described later.

  In addition, the undeformed cap part 181x (see FIG. 7) of the undeformed outer sealing member 180x before the pressure deformation includes a disk part 181i, a taper part 181j, and a peripheral part 181m. The disc part 181i is parallel to the case lid member 113 and has a disc shape. Further, the peripheral edge portion 181m is located closer to the case lid member 113 (lower side in FIG. 7) than the disc portion 181i, and forms an annular shape parallel to the case lid member 113. The tapered portion 181j has a tapered shape (conical frustum shape) connecting the disc portion 181i and the peripheral portion 181m.

  The cap part 181 (undeformed cap part 181x) covers the liquid injection hole 170 and a rubber plug member 190, which will be described later, from the outside of the battery case 110, and covers the entire recess 175, so that the battery case 110 (the case lid member) 113). Specifically, the annular peripheral portion 181m of the cap portion 181 (undeformed cap portion 181x) is welded to the annular peripheral portion 113m surrounding the liquid injection hole 170 in the case lid member 113 over the entire circumference. Thus, an annular welded portion 181y is formed in plan view. Accordingly, the outer sealing member 180 (the peripheral portion 181m of the cap portion 181) and the hole peripheral portion 113m of the battery case 110 are airtightly joined.

  The needle-like protrusion 183 has a conical shape with a sharp tip 183s, and is joined (welded) to the center of the inner surface 181c of the disk portion 181i in the cap portion 181 (undeformed cap portion 181x). , Extending toward the liquid injection hole 170. This needle-like protrusion 183 passes through a rubber plug member 190 described later. For this reason, a communication hole 190 h having a very small gap is formed between the needle-like protrusion 183 and the rubber plug member 190, and the inside and outside of the battery case 110 are communicated. Thus, the gas in the battery case 110 can flow through the communication hole 190h.

The rubber plug member 190 is made of a rubber-like elastic body, which is ethylene propylene diene rubber (EPDM) in the first embodiment, and includes an insertion portion 191 and a flange portion 193.
Of these, the insertion portion 191 has a truncated cone shape having a small-diameter top surface 191c, a large-diameter bottom surface 191d, and a side surface 191f connecting them. Among these, the top surface 191 c is smaller in diameter than the inner diameter of the liquid injection hole 170. On the other hand, the bottom surface 191 d is larger in diameter than the top surface 191 c and larger in diameter than the inner diameter of the liquid injection hole 170. In addition, a truncated cone-shaped recess 191k that is recessed toward the top surface 191c is formed at the center of the bottom surface 191d of the insertion portion 191. In the recess 191k, the needle-like protrusion 183 of the outer sealing member 180 is inserted.

  The insertion portion 191 is disposed coaxially with the liquid injection hole 170 and the outer sealing member 180, and is inserted into the liquid injection hole 170. Specifically, the insertion portion 191 is press-fitted into the liquid injection hole 170, and due to its own elasticity, the side surface 191f is a corner portion formed by the hole side surface 170f of the liquid injection hole 170 and the concave bottom surface 175f2 of the concave portion 175. 170fa is hermetically pressed. However, as described above, a communication hole 190h that communicates the inside and outside of the battery case 110 is formed between the rubber plug member 190 (insertion portion 191) and the needle-like projection portion 183. The liquid hole 170 is not hermetically sealed and is in a state in which gas can flow.

  On the other hand, the flange portion 193 has an annular shape in plan view with a substantially rectangular cross section and an outer diameter smaller than the inner diameter of the recess 175 (the outer diameter of the recess bottom surface 175f2). The flange portion 193 is connected to the insertion portion 191 and integrated with the insertion portion 191 in a form surrounding the insertion portion 191. The flange portion 193 is in contact with the recess bottom surface 175f2 of the recess 175.

Next, a method for manufacturing the battery 100 will be described.
First, an undeformed outer sealing member 180x composed of an undeformed cap portion 181x and a needle-like protrusion 183 is formed (see FIG. 7). Specifically, the undeformed cap portion 181x and the needle-like projection portion 183 are separately formed, and the needle-like projection portion 183 is welded to the center of the inner surface 181c of the undeformed cap portion 181x, so that the undeformed outer seal is formed. A stop member 180x is formed. A rubber plug member 190 is also prepared.

In addition, a case lid member 113 formed with a safety valve 115 and a liquid injection hole 170, energizing terminal members 151 and 151, and bolts 153 and 153 are prepared, and these are set in an injection mold. Then, the insulating members 155 and 155 are integrally formed by injection molding, and the positive electrode terminal 150 and the negative electrode terminal 160 are fixed to the case lid member 113 (see FIG. 4).
Next, the positive electrode terminal 150 and the negative electrode terminal 160 are connected (welded) to the separately formed electrode body 120. Thereafter, a case main body member 111 and an insulating film enclosure 119 are prepared, the electrode body 120 is accommodated in the case main body member 111 via the insulating film enclosure 119, and an opening 111 h of the case main body member 111 is formed in the case lid member 113. Close with. Then, the battery case 110 is formed by welding the case body member 111 and the case lid member 113 by laser welding (see FIG. 1).

  Next, the airtightness of the battery case 110 and the like is inspected (battery case airtightness inspection step). Specifically, the battery 100 is placed in a chamber, the chamber is filled with helium gas, and a suction nozzle is attached to the liquid injection hole 170 of the case lid member 113 in an airtight manner. The pressure is reduced. For example, a joined portion of the battery case 110 (welded portion between the case main body member 111 and the case lid member 113) or a fixed portion between the battery case 110 and the positive electrode terminal 150 or the negative electrode terminal 160 (the case lid member 113 and the insulating member 155). When there is a sealing failure between the insulating member 155 and the energizing terminal member 151), helium gas outside the battery case 110 enters the battery case 110. Therefore, the airtightness of the battery case 110 and the like can be inspected by detecting the helium gas that has entered the battery case 110.

  Next, the battery 100 is placed in a vacuum chamber and the vacuum chamber is depressurized. Then, a liquid injection nozzle is inserted into the liquid injection hole 170, and the electrolytic solution 117 is injected into the battery case 110 from the liquid injection nozzle. Thereafter, the periphery of the liquid injection hole 170 (including the hole peripheral portion 113m) is cleaned with a nonwoven fabric. When the electrolytic solution 117 is injected, the electrolytic solution 117 may adhere to the periphery of the liquid injection hole 170. This cleaning can clean the periphery of the liquid injection hole 170.

  Next, a temporary sealing step is performed under this reduced pressure (see FIG. 6). That is, the rubber plug member 190 is press-fitted into the liquid injection hole 170 to temporarily seal the liquid injection hole 170 in an airtight manner. Specifically, the insertion part 191 of the rubber plug member 190 is press-fitted into the liquid injection hole 170 from the outside of the battery case 110, and the side surface 191f of the insertion part 191 is press-contacted with the corner part 170fa of the liquid injection hole 170 to be inserted. The liquid injection hole 170 is temporarily hermetically sealed (sealed) with the portion 191. At that time, since the insertion portion 191 also serves as a positioning guide, the rubber plug member 190 can be accurately positioned with respect to the liquid injection hole 170.

After the temporary sealing, the inside of the vacuum chamber is returned to the atmospheric pressure, and the battery 100 is taken out from the vacuum chamber. Since the battery case 110 is hermetically sealed by the rubber plug member 190 in the temporary sealing step, the reduced pressure state is maintained in the battery case 110 even when the battery 100 is returned to atmospheric pressure.
By the way, when the liquid injection hole 170 is not sealed, the electrolyte solution 117 accommodated in the battery case 110 may leak out of the battery or adhere to the hole peripheral portion 113m of the battery case 110. . However, in the first embodiment, the liquid injection hole 170 is temporarily hermetically sealed with the rubber plug member 190 (its insertion portion 191) in the temporary sealing step described above. Therefore, it is possible to reliably prevent the electrolyte solution 117 from leaking outside the battery. Further, the main sealing step described below can also be performed under atmospheric pressure while the inside of the battery case 110 is kept in a reduced pressure state.

  Next, the main sealing step is performed under this atmospheric pressure (see FIG. 7). That is, while the rubber plug member 190 is covered from the outside with the undeformed outer sealing member 180x, the undeformed outer sealing member 180x is airtightly and annularly fixed to the hole peripheral portion 113m of the battery case 110 (case cover member 113). . Specifically, the tip 183s of the needle-like protrusion 183 of the undeformed outer sealing member 180x faces the rubber plug member 190, and the rubber plug member 190 is covered from the outside, while the undeformed outer sealing member 180x is not deformed. The peripheral part 181m of the cap part 181x is brought into contact with the hole peripheral part 113m of the case lid member 113. In this state, laser welding is performed, and the peripheral portion 181m of the undeformed cap portion 181x and the hole peripheral portion 113m of the battery case 110 are welded over the entire circumference to form an annular welded portion 181y. Thus, the space between the outer sealing member 180 (the peripheral portion 181m of the undeformed cap portion 181x) and the hole peripheral portion 113m of the battery case 110 (the case lid member 113) is hermetically sealed.

  Next, a temporary sealing release process is performed (see FIG. 5). That is, the undeformed outer sealing member 180x is pressed and deformed from the outside, the rubber plug member 190 is deformed by the deformed outer sealing member 180, the temporary sealing is released, and the gas can flow through the injection hole 170. And Specifically, the center of the outer surface 181d of the cap part 181 in the undeformed outer sealing member 180x is pressed from the outside of the battery into the battery (downward in the figure) to deform the cap part 181. At the same time, the needle-like protrusion 183 of the outer sealing member 180 is moved toward the liquid injection hole 170, and the needle-like protrusion 183 is passed through the rubber plug member 190, so that the rubber plug member 190 is inserted into the inside and outside of the battery case 110. The communication hole 190h which connects is opened. Thereby, the gas in the battery case 110 can flow through the communication hole 190h.

  Next, a release confirmation step is performed. That is, it is confirmed that the temporary sealing of the liquid injection hole 170 by the rubber plug member 190 is released. Specifically, the X-ray CT inspection shows that the vicinity of the liquid injection hole 170 in the battery 100 is seen through, and the needle-like protrusion 183 penetrates the rubber plug member 190 to form the communication hole 190h. Check. This release confirmation step can be omitted.

  Next, in the conditioning process, the battery 100 is initially charged. At that time, gas such as hydrogen gas is generated in the battery case 110.

  Next, an airtight inspection process is performed on the battery 100. That is, the airtightness between the peripheral portion 181m of the outer sealing member 180 (its cap portion 181) and the hole peripheral portion 113m of the battery case 110 (its case lid member 113) (welded portion 181y) is inspected. Specifically, the battery 100 is placed in a vacuum chamber, and the inside of the vacuum chamber is decompressed. Then, a hydrogen gas detector (Hydrogen Leak Detector H2000: manufactured by Sensister Co., Ltd.) is installed in the vicinity of the outer sealing member 180, and hydrogen gas is detected for 120 seconds.

  As described above, the hydrogen gas generated during the initial charging exists in the battery case 110. The hydrogen gas passes between the outer sealing member 180 and the case lid member 113 through the liquid injection hole 170 (specifically, the communication hole 190h on the inside) through which the gas can flow. It reaches to the space. Therefore, when a sealing failure occurs between the peripheral edge portion 181m of the outer sealing member 180 and the hole peripheral portion 113m of the battery case 110, the peripheral edge portion 181m of the outer sealing member 180 and the hole of the battery case 110. Hydrogen gas leaks out of the battery case 110 through a portion with poor sealing in the space between the peripheral portion 113m (welded portion 181y). Thus, if hydrogen gas can be detected by the hydrogen gas detector, it can be seen that a sealing failure has occurred between the peripheral portion 181m of the outer sealing member 180 and the hole peripheral portion 113m of the battery case 110. Therefore, the batteries with poor sealing are excluded, and only good batteries 100 without defective sealing are selected. Thus, the battery 100 is completed.

  As described above, in the method for manufacturing the battery 100, the liquid injection hole 170 is temporarily sealed airtight with the rubber plug member 190 in the temporary sealing step. Therefore, it is possible to prevent the electrolytic solution 117 accommodated in the battery case 110 from leaking to the outside of the battery case 110 (such as the hole surrounding portion 113m) through the liquid injection hole 170 before the main sealing step. . Therefore, during the main sealing step, the electrolyte solution 117 leaked from the liquid injection hole 170 enters between the outer sealing member 180 (undeformed outer sealing member 180x) and the hole peripheral portion 113m of the battery case 110. Thus, it is possible to prevent a sealing failure from occurring, and the outer sealing member 180 (undeformed outer sealing member 180x) and the hole surrounding portion 113m can be reliably fixed.

  Furthermore, in the temporary sealing release step, the temporary sealing of the liquid injection hole 170 by the rubber plug member 190 is canceled, and gas can flow through the liquid injection hole 170. For this reason, in the battery 100 after the temporary sealing release step, the airtightness between the outer sealing member 180 and the battery case 110 (its peripheral portion 113m) can be easily and reliably inspected. That is, it is possible to easily and reliably inspect the airtightness between the outer sealing member 180 and the battery case 110 by inspecting whether or not the gas in the battery case 110 leaks outside the battery. And the battery in which the sealing defect has arisen among these can be excluded reliably.

  Furthermore, the first embodiment includes a release confirmation step for confirming that the temporary sealing is released for the liquid injection hole 170 after the temporary seal release step. Thereby, since it can confirm that temporary sealing is cancelled | released, the test | inspection of the airtightness between the outer side sealing member 180 and the battery case 110 can be performed more reliably.

  Further, the first embodiment includes an airtight inspection process for inspecting the airtightness between the outer sealing member 180 and the hole surrounding portion 113m of the battery case 110. Thereby, the battery in which the sealing failure has arisen between the outer side sealing member 180 and the battery case 110 can be excluded reliably. Therefore, the battery 100 in which the airtightness between the outer sealing member 180 and the battery case 110 is easily and reliably inspected can be manufactured.

  In the first embodiment, the outer sealing member 180 (undeformed outer sealing member 180x) has a needle-like protrusion 183 that extends toward the liquid injection hole 170 and has a sharp tip 183s. In the sealing release process, the acicular protrusion 183 is moved toward the liquid injection hole 170 in accordance with the pressing deformation of the outer sealing member 180, and the rubber plug member 190 is moved inside and outside the battery case 110 by the acicular protrusion 183. Is a step of opening a communication hole 190h that communicates with each other. Thus, since the needle-like protrusion 183 is provided in the outer sealing member 180 (undeformed outer sealing member 180x), and the communication hole 190h is opened in the rubber plug member 190 by the needle-like protrusion 183, the temporary sealing is performed. The release of the stop can be easily and reliably performed. Therefore, an airtight inspection between the outer sealing member 180 and the battery case 110 can be reliably performed.

  Moreover, in this Embodiment 1, a temporary sealing process is performed under pressure reduction and this sealing process is performed under atmospheric pressure. By performing the temporary sealing step under reduced pressure, the inside of the battery case 110 after temporary sealing can be brought into a reduced pressure state (negative pressure). For this reason, it is possible to prevent the internal pressure of the battery case 110 from becoming high at an early stage even if gas is generated in the battery case 110 during the conditioning process (initial charging) performed after the main sealing process or during subsequent use. On the other hand, since the main sealing step for performing welding or the like is performed under atmospheric pressure, the main sealing step can be easily performed as compared with the case where the main sealing step is performed under reduced pressure.

(Embodiment 2)
Next, a second embodiment will be described. In the lithium ion secondary battery (battery) 200 according to the second embodiment, the outer sealing member 280 and the rubber plug member 290 (see FIGS. 8 to 10) are sealed outside the battery 100 according to the first embodiment. It differs from the form (FIGS. 5-7) of the member 280 and the rubber plug member 290. Accordingly, the manufacturing method of the battery 200 is also different from the manufacturing method of the battery 100 according to the first embodiment. Other than that, the second embodiment is the same as the first embodiment, and the description of the same parts as the first embodiment is omitted or simplified.

  The outer side sealing member 280 which concerns on this Embodiment 2 is comprised from the cap part 181 and the extension part 283 (refer FIG.8 and FIG.10). Among these, the shapes of the cap portion 181 and the undeformed cap portion 181x are the same as the shapes of the cap portion 181 and the undeformed cap portion 181x of the first embodiment. On the other hand, the extending portion 283 has a cylindrical shape, is joined to the center of the inner surface 181 c of the disc portion 181 i of the cap portion 181, and extends toward the liquid injection hole 170. Although this extending portion 283 passes through the liquid injection hole 170, a large gap is formed between the extending portion 283 and the liquid injection hole 170, so that the gas in the battery case 110 is injected into the liquid injection hole. The hole 170 can be circulated.

  On the other hand, the rubber plug member 290 according to the second embodiment includes an insertion portion 291 (see FIGS. 9 and 10). The insertion portion 291 has a truncated cone shape having a small-diameter top surface 291c, a large-diameter bottom surface 291d, and a side surface 291f connecting them. In addition, a truncated cone-shaped recess 291k that is recessed toward the top surface 291c is formed at the center of the bottom surface 291d of the insertion portion 291. However, in the second embodiment, in the completed battery 200, the rubber plug member 290 is not locked to the liquid injection hole 170 like the rubber plug member 190 of the first embodiment, and is not inside the battery case 110. Has been placed.

Next, a method for manufacturing the battery 200 according to Embodiment 2 will be described.
The outer sealing member 280 (see FIG. 10) is formed by separately forming the undeformed cap portion 181x and the extending portion 283, and welding the extending portion 283 to the center of the inner surface 181c of the undeformed cap portion 181x. To form. A rubber plug member 290 is also prepared.
Then, in the same manner as in the first embodiment, the positive electrode terminal 150 and the negative electrode terminal 160 are fixed to the case lid member 113 (see FIG. 4), the electrode body 120 is connected to them, and the electrode body 120 is connected to the case body member 111. The case body member 111 and the case lid member 113 are welded together (see FIG. 1). Thereafter, an airtight inspection process of the battery case 110 is performed, and then an injection of the electrolytic solution 117 or the like is performed.

Next, a temporary sealing step is performed under reduced pressure (see FIG. 9). That is, as in the first embodiment, the rubber plug member 290 (insertion portion 291) is press-fitted into the liquid injection hole 170, and the liquid injection hole 170 is temporarily sealed (sealed). After temporary sealing, the inside of the vacuum chamber is returned to atmospheric pressure.
Next, the main sealing step is performed under atmospheric pressure (see FIG. 10). That is, as in the first embodiment, the rubber plug member 290 is covered from the outside, and the undeformed outer sealing member 280x (the peripheral portion 181m of the undeformed cap portion 181x) is replaced with the battery case 110 (the case lid member 113). It is hermetically and annularly fixed to the hole periphery 113m by welding.

  Next, a temporary sealing release process is performed (see FIG. 8). That is, the undeformed outer sealing member 280x is pressed and deformed from the outside, the rubber plug member 290 is moved by the outer sealing member 280, the temporary sealing is released, and the gas can flow through the liquid injection hole 170. . Specifically, the center of the outer surface 181d of the undeformed cap portion 181x of the undeformed outer sealing member 280x is pressed downward from the outside of the battery to the inside of the battery to deform the undeformed cap portion 181x. . At the same time, the extending portion 283 of the outer sealing member 280 is moved toward the liquid injection hole 170, and the rubber plug member 290 is pushed by the extending portion 283 and dropped into the battery case 110. Thereby, the gas in the battery case 110 can flow through the liquid injection hole 170.

  Next, a release confirmation step is performed. That is, it is confirmed that the temporary sealing of the liquid injection hole 170 is released. Specifically, as in the first embodiment, the vicinity of the liquid injection hole 170 in the battery 100 is seen through by X-ray CT inspection. Then, it is confirmed that the rubber plug member 290 is not locked to the liquid injection hole 170.

In addition, this confirmation cancellation | release process can also be performed as follows. That is, in the second embodiment, since the rubber plug member 290 is present inside the battery case 110, the rubber plug member 290 is caused to collide with the battery case 110 and the like by swinging the battery 100 to generate a collision sound. Can be generated. Therefore, the release of the temporary sealing can be confirmed by detecting the collision sound.
After the confirmation cancellation process, the conditioning process is performed in the same manner as in the first embodiment, and then the airtightness inspection process is performed. Thus, the battery 200 is completed. Note that the release confirmation step can be omitted.

  The manufacturing method of the battery 200 also includes a temporary sealing step and a main sealing step. Therefore, during the main sealing step, the electrolyte solution 117 leaked from the liquid injection hole 170 enters between the outer sealing member 280 (undeformed outer sealing member 280x) and the hole peripheral portion 113m of the battery case 110. Therefore, it is possible to prevent a sealing failure from occurring, and the outer sealing member 280 (undeformed outer sealing member 280x) and the hole surrounding portion 113m can be securely fixed. Further, in the temporary sealing release step, the temporary sealing of the liquid injection hole 170 by the rubber plug member 290 is canceled, and gas can flow through the liquid injection hole 170. For this reason, in the battery 200 after the temporary sealing release step, the airtightness between the outer sealing member 280 and the battery case 110 (its peripheral portion 113m) can be easily and reliably inspected.

  Furthermore, in the second embodiment, the outer sealing member 280 (undeformed outer sealing member 280x) has an extending portion 283 extending toward the liquid injection hole 170, and the temporary sealing release step is performed by the outer sealing. In this process, the extension 283 is moved toward the liquid injection hole 170 in accordance with the pressing deformation of the member 280, and the rubber plug member 290 is moved by the extension 283 and dropped into the battery case 110. As described above, the extension part 283 is provided in the outer sealing member 280 (undeformed outer sealing member 280x), and the rubber plug member 290 is moved by the extension part 283 and dropped into the battery case 110. The sealing can be released easily and reliably. Therefore, the airtightness test between the outer sealing member 280 and the battery case 110 can be reliably performed. In addition, the same parts as those of the method for manufacturing the battery 100 according to the first embodiment have the same functions and effects as those of the first embodiment.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first and second embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof. Yes.

For example, in the first embodiment, the communication hole 190h is opened in the rubber plug member 190 by the needle-like protrusion 183 of the outer sealing member 180, and the temporary sealing of the liquid injection hole 170 by the rubber plug member 190 is released. In the second embodiment, the rubber plug member 290 is dropped into the battery case 110 by the extending portion 283 of the outer sealing member 280, and the temporary sealing of the liquid injection hole 170 by the rubber plug member 290 is released. However, the method for releasing the temporary sealing in the temporary sealing releasing step is not limited to these.
For example, as a first modification, as shown in FIG. 11, the rubber plug member 390 is provided with an extending portion 393 extending from the insertion portion 391 toward the outer sealing member 380 (undeformed outer sealing member 380x). In the temporary sealing release step, the undeformed outer sealing member 380x is pressed and deformed from the outside, the outer sealing member 380 pushes the extending portion 393 of the rubber plug member 390, and the rubber plug member 390 is moved to the battery case. It may be dropped into 110 to release the temporary sealing (see FIG. 12). Also in this battery 300, since gas can flow through the liquid injection hole 170, the airtightness between the outer sealing member 380 and the battery case 110 can be easily and reliably inspected.

  Further, for example, as a second modified example, as shown in FIG. 13, the outer sealing member 480 (undeformed outer sealing member 480 x) is provided with an extending portion 483 extending toward the liquid injection hole 170, and the rubber plug member 490. In addition, an extension part 493 extending from the insertion part 491 toward the extension part 483 of the outer sealing member 480 (undeformed outer sealing member 480x) is provided. Then, in the temporary sealing release step, the undeformed outer sealing member 480x is pressed and deformed from the outside, and the extending portion 493 of the rubber plug member 490 is pushed by the extending portion 483 of the outer sealing member 480. The temporary sealing may be released by dropping 490 into the battery case 110 (see FIG. 14). The battery 400 can also inspect the airtightness between the outer sealing member 480 and the battery case 110 easily and reliably because the gas can flow through the liquid injection hole 170.

  Further, for example, as a third modification, as shown in FIG. 15, an intermediate member 595, which is a separate member, is provided between the outer sealing member 380 (undeformed outer sealing member 380 x) and the rubber plug member 590. It arrange | positions before performing this sealing. In the intermediate member 595, a needle-like protrusion 598 extending toward the liquid injection hole 170 is joined to a disc-shaped base 596. In the temporary sealing release step, the undeformed outer sealing member 380x is pressed and deformed from the outside, the base 596 of the intermediate member 595 is pressed by the outer sealing member 380, and the needle-like protrusions 598 of the intermediate member 595 are pressed. The rubber plug member 590 may be provided with a communication hole 590h that communicates the inside and outside of the battery case 110 to release the temporary sealing (see FIG. 16). This battery 500 can also inspect the airtightness between the outer sealing member 380 and the battery case 110 easily and reliably because the gas can flow through the liquid injection hole 170.

  Further, for example, as a fourth modification, as shown in FIG. 17, an intermediate member 695, which is a separate member, is provided between the outer sealing member 380 (undeformed outer sealing member 380 x) and the rubber plug member 690. It arrange | positions before performing this sealing. In the intermediate member 695, an extension portion 698 extending toward the liquid injection hole 170 is joined to a disc-shaped base portion 696. In the temporary sealing release step, the undeformed outer sealing member 380x is pressed and deformed from the outside, the base 696 of the intermediate member 695 is pushed by the outer sealing member 380, and the rubber plug is pushed by the extending portion 698 of the intermediate member 695. The member 690 may be moved and dropped into the battery case 110 to release the temporary sealing (see FIG. 18). This battery 500 can also inspect the airtightness between the outer sealing member 380 and the battery case 110 easily and reliably because the gas can flow through the liquid injection hole 170.

  In the first and second embodiments and the first to fourth modifications, the injection hole 170 for injecting the electrolytic solution 117 is exemplified as the “through hole” that communicates the inside and outside of the battery case. Not limited to holes. Examples of the through hole include a vent hole for venting gas from the battery case. In the first and second embodiments, the “through hole” is provided in the case lid member 113 of the battery case 110, but the formation position of the through hole is not limited thereto. For example, the through hole may be provided on a side surface or a bottom surface of the case main body member 111. In the first and second embodiments, the form of the “through hole” is a circular hole, but the form of the through hole can be changed as appropriate.

  In the first and second embodiments, as the “electrode body”, a wound-type electrode body 120 formed by winding a positive electrode plate 121 and a negative electrode plate 131 each having a band shape on each other via separators 141 and 141 is used. Although illustrated, the form of the electrode body is not limited to this. For example, the electrode body may be a stacked type in which a plurality of positive and negative electrode plates each having a predetermined shape (for example, a rectangular shape) are alternately stacked via a separator.

  In the first and second embodiments, rubber plug members 190, 290, 390, 490, 590, and 690 made of ethylene propylene diene rubber (EPDM) are exemplified as “rubber plug members”. The material of the rubber-like elastic body forming the above is not limited to this. Examples of the rubber-like elastic material include acrylic rubber (ACM), nitrile rubber (NBR), isoprene rubber (IR), urethane rubber (U), chlorosulfonated polyethylene (CSM), epichlorohydrin rubber (CO, ECO), Examples include chloroprene rubber (CR), silicone rubber (Q), styrene-butadiene rubber (SBR), butadiene rubber (BR), fluorine rubber (FKM), and butyl rubber (IIR). Further, the shape of the rubber plug member is not limited to the rubber plug members 190, 290 and the like in the first and second embodiments, and can be appropriately changed.

  In Embodiments 1 and 2 and the like, the cap portion 181 formed by pressing and deforming the undeformed cap portion 181x is exemplified as the “cap portion” of the outer sealing member. However, the material and shape of the undeformed cap portion are as follows. It can be changed as appropriate. Further, the material and shape of the “needle protrusion” provided on the outer sealing member are not limited to the needle protrusion 183 of the first embodiment, and can be appropriately changed. Further, the material and shape of the “extension part” provided in the outer sealing member are not limited to the extension part 283 of the second embodiment and the extension part 483 of the second modification, and can be changed as appropriate.

  In the first and second embodiments, the outer sealing members 180, 280, 380, and 480 are fixed to the hole peripheral portion 113m of the battery case 110 by welding, but the fixing method is not limited thereto. For example, the outer sealing member may be fixed to the hole peripheral portion of the battery case by using brazing material, solder, adhesive, or the like, or by caulking or winding.

  In the first and second embodiments, as the “air tightness inspection process”, the batteries 100, 200, 300, 400, 500, 600 are placed under reduced pressure, and gas leaks from the battery case 110 using a gas detector. However, the method of the airtight inspection is not limited to this. For example, the battery 100 or the like may be immersed in a liquid such as water, and gas leakage (bubbles) from the inside of the battery case 110 may be confirmed visually.

100, 200, 300, 400, 500, 600 Lithium ion secondary battery (battery)
110 Battery Case 111 Case Body Member 113 Case Cover Member 113m Hole Perimeter 117 Electrolyte 120 Electrode Body 150 Positive Terminal 160 Negative Terminal 170 Injection Hole (Through Hole)
175 Recesses 180, 280, 380, 480 Outer sealing members 180x, 280x, 380x, 480x Undeformed outer sealing member 181 (Outside sealing member) Cap portion 181x (Undeformed outer sealing member) Undeformed cap portion 181m Peripheral part 181y Welding part 183 Needle-like projection part 183s (of outer sealing member) Tip 283,483 (outside sealing member) Extension part 190, 290, 390, 490, 590, 690 Rubber plug members 190h, 590h Communicating holes 191, 291, 391, 491 Insertion parts 393, 493 Extension parts 595, 695 (for rubber plug members) Intermediate members 596, 696 Base parts 598 (for intermediate members) Needle-like protrusion 698 (intermediate member extension)

Claims (7)

A battery case having a through-hole communicating with the inside and outside of itself;
An electrode body housed in the battery case;
An outer seal that covers the through hole from the outside of the battery case, and is hermetically and annularly fixed around the annular hole surrounding the through hole in the battery case, and the through hole is hermetically sealed. A battery manufacturing method comprising: a member;
A temporary sealing step in which a rubber plug member made of a rubber-like elastic body is press-fitted into the through hole from the outside of the battery case, and the through hole is temporarily sealed in the rubber plug member;
After the temporary sealing step, the outer sealing member is covered with the outer sealing member from the outside, and the outer sealing member is hermetically and annularly fixed to the hole peripheral portion of the battery case. When,
After the main sealing step, the outer sealing member is pressed and deformed from the outside, and the rubber plug member is deformed or moved directly or indirectly by the outer sealing member to release the temporary sealing. And a temporary sealing release step for allowing gas to flow through the through hole. A battery manufacturing method according to claim 1, comprising:
A battery manufacturing method comprising a release confirmation step for confirming that the temporary seal has been released for the through hole after the temporary seal release step. A method of manufacturing a battery according to claim 2,
A battery manufacturing method comprising an airtight inspection step of inspecting an airtightness between the outer sealing member and the hole peripheral portion of the battery case after the release confirmation step. A battery manufacturing method according to claim 1, comprising:
A battery manufacturing method comprising an airtight inspection step of inspecting an airtightness between the outer sealing member and the hole peripheral portion of the battery case after the temporary sealing release step. It is a manufacturing method of the battery as described in any one of Claims 1-4, Comprising:
The outer sealing member is
Extending toward the through-hole and having a needle-like protrusion with a pointed tip,
The temporary sealing release step includes
As the outer sealing member is pressed and deformed, the needle-like protrusion is moved toward the through hole, and the needle-like protrusion opens a communication hole for communicating the inside and outside of the battery case with the rubber plug member. A method for producing a battery as a process. It is a manufacturing method of the battery as described in any one of Claims 1-4, Comprising:
The outer sealing member is
An extending portion extending toward the through hole;
The temporary sealing release step includes
The battery manufacturing method is a step of moving the extension part toward the through hole in accordance with the pressing deformation of the outer sealing member and dropping the rubber plug member into the battery case at the extension part. . It is a manufacturing method of the battery as described in any one of Claims 1-6, Comprising:
The temporary sealing step is performed under reduced pressure,
The main sealing step is a battery manufacturing method performed under atmospheric pressure.

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