JP2010049913A - Manufacturing method of sealed battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a sealed battery capable of performing with ease a plurality of times sealing operations and at least one seal-opening operation for a battery case at its manufacturing stage. <P>SOLUTION: The manufacturing method of the sealed battery 1 equipped with the battery case 10 with its communication opening H and a power generation element 60 housed in the battery case includes: a first sealing process of sealing the case body portion and a first case side cylindrical portion 42 as the battery case provided with a case body portion 31 and a communicating cylindrical portion 41 made of a metallic foil compound resin film LF, cylindrical shaped and extended from the case body portion forms a first sealing portion S1; a first communication process of letting an inside of the case body portion communicate with an outside by opening an opening portion 41T; a second sealing process of sealing the case body portion and a second case side cylindrical portion 43 by forming a second sealing portion S2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a sealed battery.

In recent years, with the spread of portable electronic devices such as mobile phones, notebook computers, and video camcorders and vehicles such as hybrid electric vehicles, the demand for batteries used for these driving power sources is increasing.
Among such batteries, there is a sealed battery provided with a communication hole in a battery case through which an electrolyte can be injected from the outside to the inside. For example, Patent Document 1 includes a liquid injection member made of resin and having a liquid injection hole (communication hole) and a sealing member made of metal, and the resin of the liquid injection member is welded to the sealing member. There is a sealed battery formed by closing the communication hole.

JP 2007-193969 A

In manufacturing the sealed battery, for example, in this battery case, a plurality of times of sealing and at least one time of opening may be performed. That is, a power generation element is disposed (accommodated) in a battery case, an electrolyte solution is injected through the communication hole, the battery case is temporarily sealed, and a predetermined initial charge / discharge is performed on the battery. After that, the temporary sealing is released (opened), the gas generated in the battery case is released to the outside of the battery case, the battery case is sealed again (main sealing), and the sealed battery is completed. Let In this way, unnecessary gas generated by the initial charge / discharge can be eliminated from the inside of the battery case, and in the completed sealed battery, an increase in internal pressure due to the gas can be prevented.
However, in the sealed battery described in Patent Document 1, it is necessary to take out the sealing member after removing the resin of the liquid injection member welded to the sealing member when unsealing (opening) the sealing. It is difficult to seal the liquid injection member of the battery case a plurality of times because the sealing member is deformed or scratched.

  The present invention has been made in view of such a problem, and provides a manufacturing method of a sealed battery that can easily perform a plurality of times of sealing and at least one time of opening in a battery case during manufacturing. The purpose is to do.

  The solution is a method for manufacturing a sealed battery comprising: a battery case having a communication hole that communicates the inside and the outside of the battery itself; and a power generation element housed in the battery case. The case includes a case main body portion that houses the power generation element, and a communication cylinder portion that is formed of a resin film or a metal foil composite resin film and that forms at least a part of the communication hole and extends from the case main body portion. A first sealing portion is formed by thermally welding a part of the communication tube portion, and the case main body side and the first sealing portion of the communication tube portion are closer to the case main body side. 1st sealing process which seals 1 case side cylinder part, and it opens by the opening part by the side of the above-mentioned case body part rather than the above-mentioned 1st sealing part among the above-mentioned communicating cylinder parts, A first communication step of communicating, and the above-mentioned communication tube portion of the above A part of the case body part side of the sealing part is thermally welded to form a second sealing part, and the case body part side of the case body part and the second sealing part of the communication tube part. And a second sealing step for sealing the second case side tube portion.

In the method for manufacturing a sealed battery according to the present invention, since the communication tube portion made of the resin film or the metal foil composite resin film is used, the first sealing portion and the second sealing portion which are different from each other are thermally welded. The case main body and the first case side cylinder, or the case main body and the second case side cylinder can be sealed. Therefore, sealing at least twice (multiple times) can be performed easily and reliably.
Moreover, in the 1st sealing process and the 2nd sealing process, since the continuous cylinder part which consists of a resin film or a metal foil composite resin film is heat-welded, it seals between resin films or metal foil composite resin films And can be easily sealed as compared with Patent Document 1 in which resin is welded to another member. Furthermore, in the first communication step, since the unsealed portion of the communicating tube portion is opened, the resin film or the metal foil composite resin film may be perforated, cut, etc., and welded at the unsealed portion. As compared with Patent Document 1, which is opened by eliminating the above, it can be opened easily.
Thus, in the production of a sealed battery, the battery case can be easily sealed and opened multiple times.

  In addition, as described above, the case main body can be easily sealed or opened in the first sealing step, the second sealing step, and the first communication step. Alternatively, it is easy to seal or open a plurality at a time.

In addition, as a communication cylinder part, it is the cylinder shape which consists of a resin film or a metal foil composite resin film, and it can be sealed by heat welding by the 1st sealing part and the 2nd sealing part. Specifically, at least the first sealing portion and the second sealing portion include those whose inner side surfaces are formed of a heat-weldable resin such as polypropylene and polyethylene. Note that the entire inner side surface of the communication tube portion may be formed of a heat-weldable resin.
Moreover, as a method of opening in the opening part of a communication cylinder part, the opening by cutting | disconnecting a communication cylinder part in an opening part, or punching is mentioned.
Further, after the second sealing step, the opening and sealing may be repeated in the communication member. The battery case can be easily sealed or opened multiple times.

  Furthermore, the above-described sealed battery manufacturing method includes a liquid injection step of injecting an electrolytic solution into the battery case through the communication hole of the communication cylinder portion prior to the first sealing step. A sealed battery manufacturing method is preferable.

  In the sealed battery manufacturing method of the present invention, since the communication hole can be used for injecting the electrolyte, it is not necessary to separately form the injection hole, and the injection hole is sealed separately. There is no need.

  Furthermore, in any one of the above-described sealed battery manufacturing methods, the case main body portion and the communication tube portion may be a manufacturing method of a sealed battery made of a metal foil composite resin film.

  In the method for manufacturing a sealed battery according to the present invention, the case main body and the communication cylinder are made of a metal foil composite resin film, so that the gas (( It is possible to effectively prevent leakage of hydrogen gas or the like, or intrusion of moisture (water vapor) into the communicating tube portion and the battery case.

  Alternatively, in any one of the above-described sealed battery manufacturing methods, the battery case includes a case main body member that forms the case main body portion and the communication cylinder portion, and directly or indirectly to the case main body member. And it is good to set it as the manufacturing method of the sealed battery which has the communicating cylinder member formed by airtight connection.

  In the sealed battery manufacturing method of the present invention, since the case body member and the communicating cylinder member are separate members, for example, a metal case body member can be adopted, and the material of the case body member is selected. The degree of freedom is high, and an appropriate case body member can be used according to the application, shape, heat dissipation and the like.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
The battery 1 according to the first embodiment will be described. 1A is a perspective view of a sealed battery (hereinafter also simply referred to as a battery) 1, FIG. 1B is a cross-sectional view of the battery 1, FIG. 2 is a cross-sectional view of a laminate film, and FIG. It is a top view. This battery 1 is a sealed lithium ion secondary battery including a positive electrode tab 80 and a negative electrode tab 90 in addition to a battery case 10 made of a laminate film LF and a power generation element 60 accommodated in the battery case 10 (FIG. 1 (a)).

Among these, the power generation element 60 has a plurality of positive electrode plates 61, negative electrode plates 62, and separators 63, all of which are rectangular foil shapes (see FIGS. 1A and 1B). In the power generation element 60, the separator 63 is interposed between the positive electrode plate 61 and the negative electrode plate 62, and these are stacked in the stacking direction DL (see FIG. 1B). The power generation element 60 is impregnated with an electrolytic solution 70 obtained by adding LiPF ₆ to a mixed organic solvent of EC (ethylene carbonate) and DEC (diethyl carbonate).
Further, as shown in FIG. 3, the positive electrode tab 80 having a rectangular plate shape and made of aluminum is joined to the plurality of positive electrode plates 61 described above in the battery case 10, and among the end portions of the battery case 10. , Extending from one long side end portion 10K forming the long side to the outside.
Similarly to the positive electrode tab 80, the negative electrode tab 90 having a rectangular plate shape and made of copper is joined to the plurality of negative electrode plates 62 in the battery case 10, and is extended to the outside from the long side end portion 10 </ b> K of the battery case 10. It is extended.

In addition, the battery case 10 formed by overlapping the periphery of the two laminated films LF and LF having a concave portion to become the case main body 31 includes the case main body 31 for housing the above-described power generation element 60, and the case. From the main body portion 31, it has a communication cylinder portion 41 that constitutes a communication hole H that extends in the left front direction in FIG. In addition, a peripheral portion 15 in which two laminate films LF and LF are joined is provided on the periphery of the case main body portion 31 and the communication tube portion 41.
As shown in a sectional view of FIG. 2, the laminate film LF constituting the battery case 10 includes an aluminum foil LM and a resin layer LP made of polypropylene and coated on both sides of the aluminum foil LM. The peripheral portion 15 of the battery case 10 is formed by fusing the resin layers LP facing each other at the peripheral portions of the two laminate films LF and LF, and then solidifying and integrating them by heat welding. Thus, at the peripheral edge 15, these two laminate films LF and LF are joined in an airtight manner.

  For this reason, the above-mentioned electric power generation element 60 accommodated in the case main-body part 31 is sealed airtight. On the other hand, the cylindrical communication tube portion 41 forms a communication hole H that connects the inside and the outside of the battery case 10, specifically, the case main body portion 31 (see FIG. 3). In addition, this communication cylinder part 41 has 1st sealing part S1 sealed by heat welding in the front-end | tip part on the opposite side to the case main-body part 31 among these, and the 1st sealing part S1 and case In the vicinity of the middle of the main body 31, a second sealing portion S2 sealed by heat welding is provided. Among these, 2nd sealing part S2 seals the 2nd case side cylinder part 43 of the case main body part 31 side rather than this 2nd sealing part S2 among the case main body part 31 and the communication cylinder part 41. It becomes.

  Further, in the communication cylinder portion 41, the side surface of the distal end side cylinder portion 44 between the first sealing portion S1 and the second sealing portion S2 is opened through the communication hole H and the outside of the battery case 10. It has the opening part 41T in which the hole T was drilled. The opening T in the opening 41T is used to release the gas generated inside the case body 31 to the outside of the battery case 10 during the manufacturing process of the battery 1 to be described later.

Next, a method for manufacturing the battery 1 according to the first embodiment will be described with reference to FIGS.
FIG. 4 shows an exploded perspective view of the unwelded case member 10B before heat welding and the power generation element 60 in which the positive electrode tab 80 and the negative electrode tab 90 are joined, which constitute the battery case 10 of the battery 1. FIG.
Among them, the power generating element 60 includes a plurality of the positive electrode plates 61, the negative electrode plates 62, and the separators 63 that are previously stacked in the stacking direction DL, and the plurality of positive electrode plates 61 that are connected to the positive electrode tab 80 and a plurality of negative electrodes. The electrode plates 62 are joined to the negative electrode tab 90, respectively. The power generation element 60 is not impregnated with the electrolytic solution 70.

Further, the unwelded case member 10B made of the integral laminate film LF is previously formed as follows. That is, an unwelded case main body 31B having a rectangular concave shape that is recessed to a size that can accommodate about half of the power generating element 60 in the stacking direction DL is provided near the center of the unwelded case member 10B. Moreover, it has the unwelded communicating cylinder part 41B extended from this unwelded case main-body part 31B to the left front direction in FIG. That is, the non-welded communication tubular portion 41B extends from the long side end portion 10K of the non-welded case member 10B to the outside of the non-welded case member 10B. In addition, a U-shaped groove portion 41BG connected to the non-welded case main body portion 31B is formed in the non-welded communication tube portion 41B.
Furthermore, as shown in FIG. 4, a flat unwelded peripheral edge 15B is located at the periphery of the unwelded case main body 31B and the unwelded communicating cylinder 41B.

First, as shown in FIG. 4, the power generation element 60 is surrounded by the unwelded case body portions 31B and 31B of the two unwelded case members 10B and 10B, and the unwelded case members 10B and 10B are Overlapping. At this time, the positive electrode tab 80 and the negative electrode tab 90 joined to the power generation element 60 are arranged so as to protrude to the outside from the long side end portion 10K of the unwelded case member 10B.
Thereafter, using two heating plates (not shown), the unwelded peripheral portions 15B and 15B of the two unwelded case members 10B and 10B are sandwiched and thermally welded. As a result, the battery case 10X having the cylindrical communication cylinder portion 41 forming the communication hole H communicating from the case main body portion 31 side to the tip end side and the case main body 31 is completed (see FIG. 5).

Next, a liquid injection process for injecting the above-described electrolytic solution 70 into the battery case 10X will be described with reference to FIG.
The battery case 10X is disposed so that the communication hole H formed by the communication tube portion 41 extends in the gravity direction, and the electrolyte solution 70 is placed from the distal end side of the communication tube portion 41 using the syringe NC. Quantify and inject. In this way, the electrolytic solution 70 is impregnated into the power generation element 60 accommodated in the battery case 10 </ b> X through the communication hole H.

  Next, in the first sealing step, the communication tube portion 41 (communication hole H) of the battery case 10X after the electrolyte solution 70 is injected is temporarily sealed. Specifically, using two press jigs PL and PL whose tips are heated in a flat plate shape, a portion of the communicating tube portion 41 on the side opposite to the case main body portion 31 (FIG. 7A). In the middle, a first sealing portion PS1) surrounded by a one-dot chain line is sandwiched and thermally welded to each other to form the first sealing portion S1 in the communication cylinder portion 41 (see FIG. 7A). Thereby, the 1st case side cylinder part 42 and the case main body part 31 which are located in the case main body part 31 side rather than 1st sealing part S1 of the communication cylinder part 41 are sealed. This type of battery case is referred to as a battery case 10Y (see FIG. 7B).

After the sealing by the first sealing step, the power generation element 60 is initially charged / discharged through the positive electrode tab 80 and the negative electrode tab 90 in the form of the battery case 10Y described above. Specifically, the battery 1 is initially charged and then discharged, and charging and discharging are performed a plurality of times.
Then, during this time, gas GS is generated in the battery case 10Y due to the initial charge / discharge, but since this gas GS is unnecessary for the battery 1, it must be discharged from the inside of the battery case 10Y.

Therefore, in the next first communication step, the first case side cylindrical portion 42 of the battery case 10Y is opened, and the inside and the outside of the case main body 31 are again communicated. Specifically, in the side surface of the first case side cylindrical portion 42, a punching jig ND having a sharp tip is pierced into a portion close to the first sealing portion S1, and an opening hole T is punched to open the portion. A portion 41T is used (see FIG. 8A).
Thereby, the gas GS inside the case main body 31 and the first case side cylinder portion 42 is released to the outside through the opening hole T in the opening portion 41T (see FIG. 8B).

  Next, in the second sealing step, after releasing the gas GS, the first case side cylindrical portion 42 is sealed. Specifically, in the same manner as in the first sealing step, the opening portion 41T (opening hole) of the first case side cylindrical portion 42 is used by using two press jigs PL and PL whose tips are heated in a flat plate shape. The first case side tube portion 42 (communication tube portion 41) is sandwiched between the portions (T2) in FIG. 9 that are closer to the case main body portion 31 than the T) and are thermally welded to each other. ) To form a second sealing portion S2 (see FIG. 9). Thereby, the 2nd case side cylinder part 43 and the case main-body part 31 which are located in the case main-body part 31 side rather than 2nd sealing part S2 are sealed. Thus, the battery 1 including the battery case 10 described above is completed (see FIGS. 1 and 3).

Thus, in the manufacturing method of the battery 1 according to the first embodiment, the communication tube portion 41 made of the laminate film LF is used. For this reason, it heat-welds in the 1st sealing part S1 and 2nd sealing part S2 from which a site | part mutually differs, and seals the case main-body part 31 and the 1st case side cylinder part 42, respectively, or a case main body Since the part 31 and the second case side cylinder part 43 are sealed, at least two times of sealing can be easily and reliably performed.
Further, in the first sealing step and the second sealing step described above, since the communicating cylinder portion 41 made of the two laminate films LF and LF is thermally welded and sealed, the laminate films LF and LF are overlapped with each other. And can be easily sealed as compared with Patent Document 1 described above.
Furthermore, in the first communication step, since the opening hole T is punched in the communication tube portion 41 and the opening portion 41T is opened, the opening can be easily performed as compared with the above-described Patent Document 1.
Thus, in the production of the battery 1, the battery case 10 can be easily sealed and opened a plurality of times as necessary.

  As described above, the case main body 31 can be easily sealed or opened in the first sealing step, the second sealing step, and the first communication step. Alternatively, it is easy to seal or open a plurality at a time.

  Moreover, in the manufacturing method of the battery 1 according to the first embodiment, the communication hole H formed by the communication cylinder portion 41 is used for the injection of the electrolytic solution 70 prior to the first sealing step. It is not necessary to form the liquid injection hole, and it is not necessary to separately seal such a liquid injection hole.

  Moreover, in the manufacturing method of the battery 1 according to the first embodiment, the case main body portion 31 and the communication tubular portion 41 are made of the laminate film LF that is a metal foil composite resin film, so that compared to the case where a resin film is used, It is possible to effectively prevent gas (hydrogen gas or the like) from leaking through the communication tube portion 41 or moisture (water vapor) from entering the communication tube portion 41 and the battery case 10. .

(Modification 1)
Next, modification 1 of the present invention will be described with reference to FIGS.
In the battery 101 according to the first modification, the communication tube portion of the battery case is different from that of the first embodiment, and the other portions are the same.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified. In addition, about the same part, the same effect is produced. In addition, the same contents are described with the same numbers.

  A battery 101 according to the first modification includes a sealed lithium ion battery provided with a positive electrode tab 80 and a negative electrode tab 90 in addition to a battery case 110 made of a laminate film LF and a power generation element 60 accommodated in the battery case 110. The secondary battery (see FIG. 10).

Among these, the battery case 110 has a communication cylinder part 141 that extends to the outside from one long side end part 110 </ b> K that forms a long side among the end parts, and forms a communication hole H. However, this communication cylinder part 141 has only the 2nd sealing part S2 sealed by thermal welding in the front-end | tip on the opposite side to the case main-body part 31 among these, and is the 1st sealing part in Embodiment 1. The difference from Embodiment 1 is that S1 is not left. Further, as shown in FIG. 10, the communicating cylinder portion 141 has an extension dimension R1 extending from the long side end portion 110K smaller than that of the first embodiment (R2).
For this reason, in the battery 101 according to the first modification, the extension dimension R1 of the communication cylinder portion 141 is smaller than that of the first embodiment. For example, when the battery 101 is used as a battery pack, the communication cylinder portion is used. Since the extended dimension R1 of 141 is reduced, the case volume for the assembled battery can be reduced.

Next, a method for manufacturing the battery 101 according to the first modification will be described with reference to FIGS.
In addition, since it is the same as that of the above-mentioned Embodiment 1 until the 1st communication process, description is abbreviate | omitted.

In the first communication step of the first modification, the first case side cylindrical portion 42 of the battery case 10Y shown in FIG. 7B is opened, and the inside and the outside of the case main body 31 are communicated again. Specifically, the communicating cylinder portion 141 is cut along the cutting line CP by using a cutter CU (a disk shape in the first modification 1) that can cut the laminate film LF (see FIG. 11A).
Accordingly, an opening 141T of the communication hole H is formed at the tip of the communication cylinder portion 141 opposite to the case main body portion 31, and the gas GS inside the case main body portion 31 is transferred to the communication hole H. It is discharged to the outside of the case body 31 through the opening 141T (see FIG. 11B).

  Next, in the second sealing step, after releasing the gas GS, the second case-side cylinder portion 143 is sealed. Specifically, similarly to the first sealing step, a portion on the tip side of the second case side cylinder portion 143 (in FIG. 12) using two press jigs PL and PL whose tips are heated in a flat plate shape. The second sealing portion PS2) surrounded by the alternate long and short dash line is sandwiched and thermally welded together to form the second sealing portion S2 (see FIG. 12). Thereby, the 2nd case side cylinder part 143 and the case main-body part 31 are sealed similarly to Embodiment 1. FIG. Thus, the battery 101 including the battery case 110 is completed (see FIG. 10).

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIGS.
The battery 201 according to the second embodiment is different from the first embodiment in that the battery case is composed of a separate case main body member and a communicating cylinder member, and the rest is the same.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified. In addition, about the same part, the same effect is produced. In addition, the same contents are described with the same numbers.

A battery 201 according to the second embodiment includes a battery case 210 having a rectangular box-shaped case main body 231 and a communication cylinder 241 extending from the case main body 231, and a power generation element housed in the case main body member 230. 260 is a wound lithium ion secondary battery (see FIG. 13).
Among these, the power generation element 260 is formed by winding a belt-like positive electrode plate 261 and a negative electrode plate 262 into a flat shape via a belt-like separator 263 made of polyethylene. The power generation element 260 is also impregnated with the same electrolyte solution 70 as in the first embodiment.

  Further, as shown in FIGS. 13 and 14, the positive electrode plate 261 and the negative electrode plate 262 of the power generation element 260 are joined to a plate-like positive current collector 280 or negative current collector 290 bent in a crank shape, respectively. (See FIG. 14A). Note that both the positive electrode current collecting member 280 and the negative electrode current collecting member 290 pass through the lid portion 232 of the case main body member 230 forming the case main body portion 231 described below upward in FIG. Furthermore, of the positive electrode current collecting member 280, a positive electrode terminal portion 280A located on the tip side opposite to the joined power generation element 260 protrudes outside the case main body member 230 (lid portion 232). Further, the negative electrode terminal portion 290 </ b> A of the negative electrode current collecting member 290 also protrudes outside the case main body member 230 (lid portion 232), like the positive electrode current collecting member 280.

  The case main body member 230 includes both an aluminum accommodating portion 233 and a lid portion 232, thereby forming a case main body portion 231 that accommodates the power generation element 260. Among these, the accommodating part 233 is a bottomed rectangular box shape, and the insulating film (not shown) which consists of resin is stuck on the whole inner surface.

  The lid portion 232 has a rectangular plate shape, and closes the opening 233A of the housing portion 233 and is welded to the housing portion 233. The lid portion 232 has an insulating member 275 made of resin interposed between the positive electrode terminal portion 280A and the negative electrode terminal portion 290A, respectively, and is insulated from these. In addition to the rectangular plate-shaped safety valve 277 sealed on the upward outer surface 232a in FIG. 13, the lid portion 232 includes a cylindrical cylindrical wall portion 221 protruding upward from the outer surface 232a. Have. The cylindrical wall portion 221 forms a part of a communication hole H that communicates the inside and the outside of the battery case 210 (see FIG. 14B).

Moreover, the cylindrical communication cylinder member 240 which consists of a laminate film LF is joined to the above-mentioned cylindrical wall part 221, and is extended upwards in the figure from the outer surface 232a (refer FIG. 13). This communication cylinder member 240 deforms one flat laminate film LF into a cylindrical shape, and air-bonds the resin layers LP and LP that are in contact with each other at the ends that overlap after deformation by heat welding. It becomes.
The communication tube member 240 forms a cylindrical communication tube portion 241 and is positioned closer to the lid 232 (case body member 230) than the communication tube portion 241 and is hermetically sealed to the cylindrical wall portion 221 by heat welding. And a joint portion 248 joined to each other.

  Among these, the communication cylinder part 241 forms the communication hole H together with the above-described cylindrical wall part 221. In addition, the communication cylinder portion 241 includes a first sealing portion S1 sealed by thermal welding at a tip opposite to the lid portion 232 (case main body portion 231), and the first sealing portion S1. A second sealing portion S2 sealed by heat welding is provided in the vicinity of the middle of the lid portion 232 (case main body portion 231). Among these, 2nd sealing part S2 is 2nd of the cover part 232 (case main-body part 231) side from this 2nd sealing part S2 among the cover part 232 (case main-body part 231) and the communication cylinder part 241. 2 case side cylinder part 243 is sealed.

  In addition, in the communication cylinder part 241, an opening part 241T having an opening hole T penetrating therethrough is provided in the tip side cylinder part 244 between the first sealing part S1 and the second sealing part S2. Have.

Next, a method for manufacturing the battery 201 according to the second embodiment will be described with reference to FIGS.
FIG. 15 is an exploded perspective view of a case main body member 230 that houses a battery case 210 and a power generation element 260 before joining, which constitute the battery case 210 of the battery 201.
First, the positive electrode current collecting member 280 and the negative electrode current collecting member 290 are welded to the power generation element 260 in which the positive electrode plate 261 and the negative electrode plate 262 are wound through the separator 263 in advance, and then inserted into the lid portion 232. The power generation element 260 and the lid portion 232 are integrated with each other by fixing with the insulating member 275. This is inserted into the accommodating portion 233, and the opening 233 A of the accommodating portion 233 is sealed with the lid portion 232. Thereafter, the housing portion 233 and the lid portion 232 are welded.
In addition, it protrudes upward in FIG. 15 from the outer surface 232a of the cover part 232. The cylindrical wall portion 221 is coated with polypropylene, which is the same as the resin layer LP of the laminate film LF.

  Further, the communication tubular member 240 has a cylindrical shape obtained by deforming one flat laminate film LF in advance and joining the overlapping end portions. Specifically, the cylindrical communication tube portion 241 that forms the communication hole H described above, and the cylindrical connection tube portion 241 that is also cylindrical and covers the cylindrical wall portion 221 of the case main body member 230 (lid portion 232) and is joined thereto. 248B (see FIG. 15).

First, as shown in FIG. 15, the outer peripheral side of the cylindrical wall portion 221 is covered so as to surround the above-described joint portion 248 </ b> B.
Thereafter, while the planned joining portion 248B is held by a heated pressing jig (not shown), the periphery thereof is made to make one turn, and the joining planned portion 248B (communication tubular member 240) is thermally welded to the cylindrical wall portion 221. Thereby, the communication cylinder part 241 which airtightly communicated with the case main body member 230 is completed (refer FIG. 16).

  Thus, in the manufacturing method of the battery 201 according to the second embodiment, since the case main body member 230 and the communication cylinder member 240 are separate members, unlike the case main body portion 30 of the first embodiment made of the laminate film LF, A highly rigid aluminum case body member 230 can be employed. That is, the material of the case main body member 230 has a high degree of freedom in selection, and an appropriate case main body member 230 can be used according to the application, shape, heat dissipation and the like.

  In addition, since the subsequent liquid injection process, the 1st sealing process, the 1st communication process, and the 2nd sealing process are all the same as that of battery 1 concerning Embodiment 1, detailed explanation is omitted ( 6-9).

In the above, the present invention has been described with reference to the first and second embodiments and the first modified embodiment, but the present invention is not limited to the above-described embodiments, and can be appropriately modified and applied without departing from the gist thereof. Needless to say, you can.
For example, in Embodiment 1 and the like, the communication tube portion (communication tube member) is made of a metal foil composite resin film (laminate film), but is sealed by heat welding at the first sealing portion and the second sealing portion. For example, it may be made of a resin film. Moreover, although the resin layer of the metal foil composite resin film is made of polypropylene, a resin capable of heat welding such as polyethylene may be used. Further, the metal foil composite resin film having a resin layer coated on both sides of the aluminum foil is used. However, the resin layer may be coated at least on the bonded surface side to be joined by thermal welding.

Moreover, in Embodiment 1 etc., although the 1st sealing process, the 1st communication process, and the 2nd sealing process were performed, for example, after a 2nd sealing process, further, a communication cylinder part (communication cylinder member) ), Opening and sealing may be repeated. Further, in the first communication step, the step of cutting the communication tube portion of one battery has been shown. After arranging a plurality of batteries in a row and arranging the communication tube portions of the plurality of batteries, for example, a cutter You may cut | disconnect simultaneously with cutting devices, such as. In this case, the productivity of the battery manufacturing process can be improved.
In the second embodiment, the communication cylinder member is directly connected to the case main body member. However, for example, another member different from the communication cylinder member and the case main body member is interposed between them to indirectly connect them. You may do it.

It is explanatory drawing of the battery concerning Embodiment 1, (a) is a perspective view, (b) is sectional drawing (AA part). It is sectional drawing of a laminate film among the batteries concerning Embodiment 1. FIG. 1 is a top view of a battery according to Embodiment 1. FIG. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 1 and Modification 1. FIG. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 1 and Modification 1. FIG. FIG. 6 is an explanatory diagram of a battery injection process according to the first embodiment, the first modification, and the second embodiment. FIG. 10 is an explanatory diagram of a first sealing step for a battery according to Embodiment 1, Modification 1 and Embodiment 2. FIG. 6 is an explanatory diagram of a first communication step of a battery according to Embodiments 1 and 2. It is explanatory drawing of the 2nd sealing process of the battery concerning Embodiment 1 and Embodiment 2. FIG. 6 is a top view of a battery according to a first modification. FIG. 6 is an explanatory diagram of a first communication step of a battery according to modification 1. FIG. 12 is an explanatory diagram of a second sealing step of a battery according to modification 1. FIG. 6 is a perspective view of a battery according to Embodiment 2. FIG. FIG. 4 is a partially broken cross-sectional view of a battery according to a second embodiment. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 2. FIG. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 2. FIG.

Explanation of symbols

1,101,201 battery (sealed battery)
10, 110, 210 Battery case 31, 231 Case main body portion 41, 141, 241 Communication tube portion 41T, 241T Unsealed portion 42 First case side tube portion 43, 143, 243 Second case side tube portion 60, 260 Power generation element 70 Electrolyte 141T Opening (opening part)
230 Case body member 240 Communication tube member H Communication hole LF Laminate film (metal foil composite resin film)
S1 1st sealing part S2 2nd sealing part

Claims (4)

A battery case having a communication hole for communicating between the inside and the outside of the device;
A power generation element housed in the battery case, and a manufacturing method of a sealed battery comprising:
The battery case is
A case body for housing the power generation element;
A resin film or a metal foil composite resin film, in a cylindrical shape forming at least a part of the communication hole, and having a communication cylinder portion extending from the case main body,
A first sealing part is formed by thermally welding a part of the communication cylinder part, and the first case side closer to the case body part than the first sealing part of the case main body part and the communication cylinder part A first sealing step for sealing the tube portion;
A first communication step in which the inside of the case main body is communicated with the outside by opening the unsealed portion on the case main body side of the first sealing portion among the communication cylinder portions;
A part of the communication tube portion closer to the case main body than the opening portion is thermally welded to form a second sealing portion, and the case main body portion and the second sealing portion of the communication tube portion And a second sealing step of sealing the second case-side cylinder portion on the case body side. It is a manufacturing method of the sealed battery according to claim 1,
Prior to the first sealing step, a sealed battery manufacturing method including a liquid injection step of injecting an electrolytic solution into the battery case through the communication hole of the communication cylinder portion. A method of manufacturing a sealed battery according to claim 1 or 2,
The case main body part and the communication cylinder part are a manufacturing method of a sealed battery made of a metal foil composite resin film. A method of manufacturing a sealed battery according to claim 1 or 2,
The battery case is
A case main body member forming the case main body,
A method for manufacturing a sealed battery, comprising: a communicating cylinder member that is connected to the case body member directly or indirectly and in an airtight manner.

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