JP2015122211A - Method for manufacturing power storage device, and power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a power storage device and a power storage device, capable of discharging a gas to the outside of a case.SOLUTION: A method for manufacturing a secondary battery 10 includes the steps of: injecting an electrolytic solution into a case 11 from a liquid injection port 13d; temporarily sealing the liquid injection port 13d with a sealing member; removing the sealing member from the liquid injection port 13d and discharging a gas in the case 11 from the liquid injection port 13d; and regularly sealing the liquid injection port 13d after discharging the gas. The sealing member includes a resin trunk part 45 and a flange 46 extending from the trunk part 45. The gas discharging step cuts the sealing member and opens the liquid injection port 13d by dropping the trunk part 45 from the bottom 45a side into the case 11.

Description

    The present invention relates to a method for manufacturing a power storage device including a case, an electrode assembly, an electrolytic solution, and an injection port for the electrolytic solution, and the power storage device.

  Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. Generally, a secondary battery (power storage device) having a large capacity includes a case, and the case includes a case main body having an opening and a lid that closes the opening of the case main body. An electrode assembly and an electrolytic solution are accommodated in the case. In assembling the secondary battery, after the electrode assembly is accommodated in the case body, the opening of the case body is closed with a lid. Then, after pouring electrolyte solution into the case from the liquid inlet of the lid, the liquid inlet is sealed.

  Patent document 1 is mentioned as a sealing structure of a liquid injection port, for example. As shown in FIG. 8, the lithium ion battery 80 includes a battery container including a battery can (not shown) and a battery lid 81. An electrode group and a non-aqueous electrolyte are accommodated inside the battery container. The battery lid 81 includes a non-aqueous electrolyte injection port 82 and a safety valve 83 that seals the injection port 82. The safety valve 83 includes a valve body 85 and a sleeve 86.

  The valve body 85 before sealing the liquid injection port 82 has a cylindrical member 87 and a cored bar 88. The cylindrical member 87 is a metal bottomed cylindrical shape having a flange portion 87a. The cored bar 88 has a large-diameter portion 88a whose diameter is enlarged at one end portion (tip portion), and has a fragile portion 88b in the vicinity thereof.

  In order to seal the liquid injection port 82 with the safety valve 83, first, a nonaqueous electrolyte is injected into the battery container from the liquid injection port 82, and then the sleeve 86 and the valve body 85 are inserted into the liquid injection port 82. Next, the flange 87a of the cylindrical member 87 is pressed toward the battery lid 81 side by a jig (not shown). In this state, when the other end portion (exposed portion) of the cored bar 88 is sandwiched and pulled out by a gripper (not shown), the cylindrical member 87 having a hardness lower than that of the cored bar 88 becomes the large-diameter portion 88a of the cored bar 88. The inner diameter and the outer diameter are expanded as the valve moves upward.

  At this time, the cylindrical portion 86 a of the sleeve 86 is compressed, the tubular member 87 and the battery lid 81 are brought into close contact with each other, a safety valve 83 is formed, and the liquid injection port 82 is sealed by the safety valve 83. Thereafter, the fragile portion 88 b is broken, and the other portion is separated while leaving the large diameter portion 88 a in the cylindrical member 87.

JP 2010-15867 A

  By the way, when the non-aqueous electrolyte is injected into the battery container, gas may be generated due to the reaction between the non-aqueous electrolyte and the active material of the electrode group. In the battery container, the internal pressure rises due to the gas and the battery container may expand. Therefore, it is necessary to remove the gas from the battery container. However, in Patent Document 1, the safety valve 83 can be removed from the liquid injection port 82. The gas cannot be released out of the battery container.

  An object of the present invention is to provide a method of manufacturing a power storage device and a power storage device that can release gas to the outside of the case.

  A method for manufacturing a power storage device for solving the above problems includes a case, an electrode assembly and an electrolytic solution housed in the case, and a liquid injection port for the electrolytic solution provided on a wall of the case. A step of injecting the electrolytic solution into the case from the liquid injection port, a step of temporarily sealing the liquid injection port with a sealing member, and the sealing member A step of releasing the gas in the case from the liquid injection port, and a step of finally sealing the liquid injection port after the gas has been released. The stopper member includes a body portion made of a non-conductive material and a flange extending from the body portion, and in the step of temporarily sealing the liquid injection port with a sealing member, the sealing member is: The flange portion is inserted into the liquid injection port in a state where the bottom portion is located in the case, and the flange The liquid injection port is temporarily sealed in a state of being locked to the outer wall surface of the wall portion, and in the step of releasing the gas, the sealing member is cut, and the body portion is inserted into the case from the bottom side. The gist is to drop and open the liquid injection port.

  According to this, after the liquid injection port is temporarily sealed with the sealing member, when the electrolyte reacts with the active material included in the electrode assembly and gas is generated, the gas is generated from the liquid injection port by the sealing member. Leaks out of the case. When releasing the generated gas to the outside of the case, the sealing member is cut to form a cut piece on the bottom side, and the cut piece is shaped to pass through the liquid injection port. Since this cut piece has a shell made of a non-conductive material forming an outer shell, even if the cut piece is mixed in the case, the power storage device is not affected. Therefore, by simply dropping the cut piece into the case as it is, the sealing member can be removed from the liquid injection port, and the gas can be discharged out of the case. For example, gas can be easily released as compared with the case where the cut piece is cut while being held so as not to fall into the case, or the cut piece is extracted from the liquid injection port to release the gas.

  Further, in the method of manufacturing the power storage device, the step of temporarily sealing the liquid injection port with a sealing member is such that a portion of the body portion located on the bottom side and in the case is larger than the liquid injection port. It is preferable that the caulking portion is formed by expanding the diameter from the inside until the diameter is reached.

  According to this, by forming the caulking portion in the body portion located in the case, the wall portion can be sandwiched between the flange and the caulking portion, and the liquid injection port can be suitably sealed. The caulking portion is enlarged in diameter within the case, and is neither locked nor fitted into the liquid injection port. For this reason, if a sealing member is cut | disconnected, a trunk | drum can be dropped in a case with dead weight as it is, and gas discharge | release can be performed easily.

In the method of manufacturing the power storage device, in the step of main sealing the liquid injection port, the liquid injection port is fully sealed with a sealing member different from the sealing member temporarily sealing the liquid injection port. May be.
According to this, the sealing member used in the temporary sealing step and the sealing member used in the main sealing step can be shared. Therefore, the production equipment used for sealing the liquid injection port with the sealing member can be shared.

  A power storage device for solving the above problems includes a case, an electrode assembly and an electrolytic solution accommodated in the case, and an injection port for the electrolytic solution provided on a wall portion of the case. The electrolyte is injected into the case from the liquid injection port, the liquid injection port is temporarily sealed with a sealing member, and then the sealing member is removed from the liquid injection port. After the gas in the case is released from the main body, the liquid injection port is finally sealed, and the sealing member is made of a non-conductive material and has a bottomed cylindrical shape. A case, and a cut piece generated by cutting the body portion in order to remove the sealing member from the liquid injection port. This is the gist.

  According to this, after the liquid injection port is temporarily sealed with the sealing member, when the electrolyte reacts with the active material included in the electrode assembly and gas is generated, the gas is generated from the liquid injection port by the sealing member. Leaks out of the case. When releasing the generated gas to the outside of the case, the sealing member is cut to form a cut piece on the bottom side, and the cut piece is shaped to pass through the liquid injection port. Since this cut piece has a shell made of a non-conductive material forming an outer shell, even if the cut piece is mixed in the case, the power storage device is not affected.

  Regarding the power storage device, the power storage device is a secondary battery.

  According to the present invention, gas can be discharged out of the case.

The perspective view which shows the secondary battery of embodiment. The fragmentary sectional view which shows the inside of a secondary battery. The perspective view which shows a sealing member and a mandrel. Sectional drawing which shows the state which inserted the sealing member in the liquid injection port. Sectional drawing which shows the state which temporarily sealed the liquid injection port with the sealing member. Sectional drawing which expands and shows a sealing member. Sectional drawing which shows the state which cut | disconnected the sealing member and opened the liquid injection port. The figure which shows background art.

A power storage device manufacturing method, and an embodiment in which the power storage device is embodied as a secondary battery and a secondary battery will be described with reference to FIGS.
As shown in FIG. 1, the secondary battery 10 includes a case 11 in which an electrode assembly 14 and an electrolytic solution (not shown) are accommodated. The case 11 includes a bottomed square cylindrical case main body 12 and a rectangular flat lid 13 that closes an opening 12 a for inserting the electrode assembly 14 into the case main body 12. In the present embodiment, the lid body 13 corresponds to a wall portion constituting the case 11. Both the case main body 12 and the lid body 13 are made of metal (for example, made of stainless steel or aluminum). The secondary battery 10 is a square battery. The secondary battery 10 is a lithium ion battery.

  The electrode assembly 14 is configured by alternately laminating a plurality of positive electrodes 21 as electrodes and a plurality of negative electrodes 24 as electrodes via resin separators. The positive electrode 21 includes a positive electrode active material on both surfaces of a positive metal foil (aluminum foil). The negative electrode 24 includes a negative electrode active material on both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 14 has a laminated structure in which a plurality of positive electrodes 21 and a plurality of negative electrodes 24 are alternately laminated, and a separator is interposed therebetween. The positive electrode 21 has a positive current collecting tab 31 protruding from a part of the first side 21a, and the negative electrode 24 is a negative current collecting tab protruding from a part of the first side 24a. It has a tab 32.

  The positive electrode 21 and the negative electrode 24 are arranged such that the positive electrode current collecting tabs 31 are arranged in a line along the stacking direction, and the negative electrode current collecting tabs 32 are not overlapped with the positive electrode current collecting tabs 31. They are stacked so as to be arranged in a row along the stacking direction. The positive electrode current collecting tabs 31 are bent in a state of being collected (bundled) within a range from one end to the other end in the stacking direction of the electrode assembly 14. All the positive electrode current collecting tabs 31 are electrically connected by welding the portions where the positive electrode current collecting tabs 31 overlap, and the positive electrode current collecting tabs 31 have a rectangular plate shape. A positive electrode conductive member 15a is connected. A positive electrode terminal 15 is connected to the positive electrode conductive member 15a.

  All the negative electrode current collecting tabs 32 are electrically connected by welding the portions where the negative electrode current collecting tabs 32 are overlapped, and the negative electrode current collecting tabs 32 have a rectangular plate shape. The negative electrode conductive member 16a is connected. A negative electrode terminal 16 is connected to the negative electrode conductive member 16a. The positive electrode terminal 15 and the negative electrode terminal 16 protrude out of the case 11 through the through hole 13 a of the lid 13, and the positive electrode terminal 15 and the negative electrode terminal 16 have a ring-shaped insulating ring 17 for insulation from the case 11. Are attached to each.

  The secondary battery 10 includes a conductive member cover that insulates the inner wall surface 13b of the lid 13 from the positive electrode conductive member 15a and the negative electrode conductive member 16a, and insulates the inner surface of the case body 12 from the positive electrode conductive member 15a and the negative electrode conductive member 16a. 33. The conductive member cover 33 is made of an insulating resin and has a plate-like shape with a U-shaped cross section as a whole.

  The conductive member cover 33 includes a rectangular main body portion 34, and the main body portion 34 is stretched over a part of the positive electrode conductive member 15 a and a part of the negative electrode conductive member 16 a along the longitudinal direction thereof. In addition, the conductive member cover 33 includes side wall portions 35 on each of the pair of long side edges of the main body portion 34. Each of the side wall portions 35 has a rectangular shape that is orthogonal to the main body portion 34 and protrudes toward the electrode assembly 14 in the case 11. Each side wall 35 is disposed between the inner surface of the case body 12, the long side edges of the positive electrode conductive member 15 a and the negative electrode conductive member 16 a, and the current collecting tabs 31 and 32.

  As shown in FIG. 2, in the lid 13, a surface facing the inside of the case 11 is an inner wall surface 13 b and a surface facing the outside of the case 11 is an outer wall surface 13 c. The lid body 13 includes a liquid injection port 13d. The liquid injection port 13d allows the inner wall surface 13b and the outer wall surface 13c to communicate with each other and penetrates the lid body 13 in the thickness direction.

  Next, the sealing member 44 that temporarily seals or fully seals the liquid injection port 13d will be described. The temporary sealing means a step of temporarily sealing the secondary battery 10 by sealing the injection port 13d with the sealing member 44 in the manufacturing stage of the secondary battery (power storage device) 10. Initial sealing, aging, etc. are performed after sealing. On the other hand, the main sealing means that the secondary battery 10 in which the initial charging, aging, and the like have been completed is performed by removing the sealing member 44 that is temporarily sealed from the liquid injection port 13d. In this step, after the sealed state is released and the gas in the secondary battery 10 is removed, the liquid injection port 13d is sealed again with the sealing member 44. The secondary battery 10 with the main sealing is then completed as a product through self-discharge and shipping inspection. In addition, conditioning may be performed to stabilize the secondary battery 10 in a temporarily sealed state or a fully sealed state.

  As shown in FIGS. 3 and 4, the sealing member 44 includes a bottomed cylindrical body 45, a hexagonal annular flange 46 provided at the opening edge of the body 45, and the interior of the body 45. And a mandrel 40 to be accommodated. The body 45 and the flange 46 are made of resin as a non-conductive material, and the body 45 and the flange 46 are integrally formed. The body 45 has a bottom 45a at the end opposite to the end provided with the flange 46 in the axial direction. The body portion 45 has an accommodating portion 45b whose inner diameter is larger than that of the large diameter portion 41 of the mandrel 40, close to the bottom portion 45a. Further, the body portion 45 has a communication portion 45 c whose inner diameter is tapered toward the flange 46 and smaller in diameter than the large diameter portion 41 (reduced in diameter) and connected to the housing portion 45 b. The trunk portion 45 includes an insertion portion 45f whose inner diameter is larger than that of the communication portion 45c, closer to the opening edge than the communication portion 45c.

  The mandrel 40 is made of metal, and the mandrel 40 is provided at a rod-like operation part 42, a large diameter part 41 having a larger diameter than the operation part 42, and a boundary between the operation part 42 and the large diameter part 41. And a fragile portion 43 having a smaller diameter. In the mandrel 40, the large-diameter portion 41 is accommodated in the accommodating portion 45b, and the fragile portion 43 is accommodated in the communicating portion 45c. The operation part 42 is accommodated in the insertion part 45 f of the body part 45, and the distal end of the operation part 42 protrudes from the body part 45. Note that the hardness of the mandrel 40 is greater than the hardness of the body 45.

In the secondary battery 10, the liquid injection port 13 d is finally sealed by the sealing member 44, and leakage of gas and electrolyte from the case 11 is prevented.
As shown in FIGS. 2 and 6, the sealing member 44 in which the liquid injection port 13 d is fully sealed is such that the bottom 45 a of the body 45 is located inside the case 11 and the flange 46 is located outside the case 11. Thus, the lid body 13 is locked via the seal member 25. The large diameter part 41 of the mandrel 40 is press-fitted into the body part 45 to expand the diameter of the body part 45 to form a caulking part 48. Therefore, the outer peripheral surface of the caulking portion 48 is in close contact with the periphery of the liquid injection port 13d on the inner wall surface 13b of the lid 13 and seals the liquid injection port 13d.

  The sealing member 44 is fastened to the lid body 13 by the caulking portion 48 and the flange 46, and the annular seal member 25 is sandwiched between the flange 46 and the lid body 13. The seal member 25 is made of a resin, for example, in consideration of resistance to electrolytic solution and repellent properties, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), polypropylene (PP) , Polyphenylene sulfide (PPS), tetrafluoroethylene-ethylene copolymer (ETFE), ethylene-propylene rubber (EPDM), and the like.

  In the sealing member 25, a surface that contacts the flange 46 is referred to as a flange-side end surface 25a, and a surface that contacts the outer wall surface 13c of the lid body 13 is referred to as a lid-side end surface 25b. Further, a surface of the flange 46 that contacts the flange-side end surface 25a of the seal member 25 is referred to as a contact surface 46a. The flange-side end surface 25 a of the seal member 25 is in close contact with the contact surface 46 a of the flange 46, and the lid-side end surface 25 b is in close contact with the outer wall surface 13 c of the lid body 13. Therefore, the liquid injection port 13 d is sealed by the seal member 25 outside the case 11.

  As shown in FIG. 2, the cut piece 50 of the sealing member 44 is on the main body 34 of the conductive member cover 33 in the case 11. The cutting piece 50 cuts the sealing member 44 at the boundary between the body portion 45 and the flange 46 along a direction orthogonal to the axial direction of the body portion 45, so that a portion of the body portion 45 on the bottom 45 a side is cut. It is formed. The cut piece 50 includes a barrel portion 45 having a caulking portion 48 and a large-diameter portion 41 accommodated in the accommodating portion 45b of the trunk portion 45. Further, the cut piece 50 is opened at the cut portion, but the large-diameter portion 41 is located closer to the bottom 45a than the opening of the body 45, and does not protrude from the body 45 to the outside.

Next, a method for manufacturing the secondary battery 10 using the sealing member 44 will be described.
First, a step of injecting an electrolytic solution into the case 11 from the liquid inlet 13d of the case 11 is performed.
Thereafter, as shown in FIG. 4, the seal member 25 is disposed around the liquid injection port 13 d on the outer wall surface 13 c of the lid 13. And while inserting the trunk | drum 45 of the sealing member 44 into the inside of the sealing member 25 from the bottom part 45a side, the trunk | drum 45 is inserted in the liquid injection port 13d. Further, the contact surface 46 a of the flange 46 is placed on the flange-side end surface 25 a of the seal member 25, and the flange 46 is locked to the lid body 13 through the seal member 25.

  Next, in the state where the flange 46 of the body 45 is pressed to the lid 13 side by a jig (not shown), the protruding portion from the body 45 of the operation part 42 of the mandrel 40 is gripper (not shown). ) And pull from the body 45. Then, the large diameter portion 41 is pulled up, and the communicating portion 45 c of the body portion 45 is expanded from the inside by the large diameter portion 41.

  As a result, as shown in FIGS. 5 and 6, the communicating portion 45c is expanded in diameter while being plastically deformed to form a caulking portion 48, and the caulking portion 48 has an inner peripheral surface around the liquid injection port 13d. Close to the wall surface 13b. And as a result of the diameter expansion of the communication part 45c in the trunk | drum 45 being controlled by the internal peripheral surface of the injection hole 13d, the further movement of the large diameter part 41 is controlled. At the position where the movement of the large-diameter portion 41 is restricted, the fragile portion 43 is located in the vicinity of the liquid injection port 13 d and is located behind the opening edge of the trunk portion 45. Then, the operation portion 42 is broken from the fragile portion 43, and only the large diameter portion 41 remains in the body portion 45, and the operation portion 42 is separated from the large diameter portion 41.

  As a result, the sealing member 44 is fastened to the lid 13 by the flange 46 and the caulking portion 48, the liquid injection port 13d is sealed by the caulking portion 48 and the sealing member 25, and the liquid injection port 13d is temporarily sealed. The That is, the step of temporarily sealing the liquid injection port 13d is completed. Then, initial charging and aging of the secondary battery 10 are performed in the temporarily sealed state. Then, gas is generated by the reaction between the electrolytic solution and each active material in the electrode assembly 14. At this time, since the liquid injection port 13d is temporarily sealed by the sealing member 44, the gas is prevented from leaking out of the case 11 from the liquid injection port 13d. In the temporarily sealed state, the internal pressure of the case 11 does not increase excessively, the sealing member 44 does not come off from the liquid injection port 13d due to the internal pressure, and the fastening strength of the sealing member 44 is not excessively necessary.

  Next, a blade portion of a cutting tool (not shown) is inserted between the flange-side end surface 25a of the seal member 25 and the contact surface 46a of the flange 46, and the sealing member 44 is connected to the flange 46 and the body portion 45 by the cutting tool. Cut from near the boundary.

  Then, as shown in FIG. 7, the bottom portion 45 a side from the cut portion falls from the liquid injection port 13 d, and the entire body portion 45 side from the cut portion falls into the case 11. As a result, the cut piece 50 is formed and the cut piece 50 is supported on the upper surface of the main body 34 of the conductive member cover 33. Further, the sealing member 25 and the flange 46 are removed from the lid body 13, and the entire sealing member 44 is removed from the liquid injection port 13d. As a result, the liquid injection port 13d is opened, and the gas generated by initial charging, aging, or the like is released from the liquid injection port 13d to the outside of the case 11.

  After the step of releasing the gas, another sealing member 44 is prepared, and the same procedure as when the liquid injection port 13d is temporarily sealed is performed, and the liquid injection port 13d is fully sealed with another sealing member 44. . As a result, as shown in FIG. 2, the sealing member 44 is fastened to the lid 13 by the flange 46 and the caulking portion 48, and the liquid injection port 13 d is sealed by the caulking portion 48 and the sealing member 25, The mouth 13d is finally sealed. That is, the step of fully sealing the liquid injection port 13d is completed.

According to the above embodiment, the following effects can be obtained.
(1) The sealing member 44 includes a resin body 45. For this reason, even if the sealing member 44 is cut and the cut piece 50 is formed, the outer shell of the cut piece 50 is formed by the body 45. Therefore, even if the cut piece 50 falls into the case 11, the cut piece 50 does not affect the electrode assembly 14 or the electrolytic solution in the case 11. Therefore, it is possible to remove the sealing member 44 from the liquid injection port 13d by simply cutting the sealing member 44 that temporarily seals the liquid injection port 13d and dropping the cut piece 50 into the case 11, and to the outside of the case 11. Gas can be released. Therefore, after cutting the sealing member 44, there is no need to hold the cut piece 50 so as not to fall into the case 11, or to remove the cut piece 50 from the liquid injection port 13d, and the liquid injection port 13d for gas release. It is possible to easily perform the work of opening the door.

  (2) The body 45 of the sealing member 44 is made of resin. For this reason, when cutting the sealing member 44, no metallic foreign matter is generated from the cut portion, and no metallic foreign matter is mixed into the case 11. Therefore, even if the sealing member 44 is cut, the secondary battery 10 is not affected.

  (3) Temporary sealing of the liquid injection port 13 d by the sealing member 44 is performed by forming a caulking portion 48 in the body portion 45 and sandwiching the lid body 13 by the caulking portion 48 and the flange 46. At this time, the body portion 45 does not expand in diameter in the liquid injection port 13 d and is expanded in diameter on the electrode assembly 14 side than the inner wall surface 13 b of the lid body 13. For this reason, if the trunk | drum 45 is cut | disconnected, the cut piece 50 will fall in the case 11 with dead weight, and the liquid injection opening 13d can be open | released simultaneously with the cutting | disconnection of the trunk | drum 45. FIG.

  (4) The body 45 of the sealing member 44 is made of resin. Therefore, in the state where the liquid injection port 13d is temporarily sealed with the sealing member 44 or the liquid injection port 13d is fully sealed with another sealing member 44, the body portion 45 and the conductive member cover 33 are caused by vibration or the like. Even if they come into contact with each other, no metal foreign matter is generated from the body 45, and even if the body 45 and the electrode assembly 14 come into contact with each other, the electrode assembly 14 can be prevented from being damaged. .

  (5) The sealing member 44 having the same configuration was used for the temporary sealing and the main sealing of the liquid injection port 13d. For this reason, in the manufacturing process of the secondary battery 10, the sealing member 44 used in the step of temporarily sealing the liquid injection port 13d and the step of main sealing the liquid injection port 13d can be shared. Therefore, the production equipment for inserting and sealing the sealing member 44 into the liquid injection port 13d can be made common, productivity can be improved, and capital investment in the production equipment can be suppressed.

  (6) The seal member 25 is sandwiched between the flange 46 of the sealing member 44 and the outer wall surface 13 c of the lid body 13. For this reason, the liquid injection port 13d can be effectively sealed by using the sealing member 44 together with the sealing of the liquid injection port 13d by the sealing member 44.

  (7) The mandrel 40 includes a fragile portion 43 at the boundary between the large diameter portion 41 and the operation portion 42. When the large diameter portion 41 expands the communication portion 45 c to form the caulking portion 48, and the movement of the large diameter portion 41 is restricted, the fragile portion 43 is located behind the opening edge of the trunk portion 45. ing. For this reason, even if the operation part 42 and the large diameter part 41 are broken from the fragile part 43, the large diameter part 41 can be positioned behind the opening edge of the body part 45, and the large diameter part 41 is cut into the cut piece 50. Protruding to the outer surface of the can be suppressed.

In addition, you may change the said embodiment as follows.
The shapes of the body 45 and the flange 46 in the sealing member 44 may be arbitrarily changed.
The sealing member 44 may be made of resin only in the body 45 and the flange 46 may be made of metal.

In the mandrel 40, if the hardness of the large diameter part 41 is larger than the hardness of the trunk part 45, the large diameter part 41 and the other parts (the operation part 42 and the fragile part 43) may be manufactured using different materials.
The mandrel 40 may be made of resin or ceramic having a hardness higher than that of the body portion 45.

O When cutting the sealing member 44, the flange 46 may be cut off to form a cut piece 50 that can pass through the liquid injection port 13d.
In the embodiment, the outer peripheral surface of the caulking portion 48 is in close contact with the inner wall surface 13b around the liquid injection port 13d to seal the liquid injection port 13d, but this is not a limitation. The outer diameter of the body portion 45 of the sealing member 44 may be the same as or slightly larger than the diameter of the liquid injection port 13d, and the liquid injection port 13d may be sealed by fitting the body portion 45 to the liquid injection port 13d. In this case, the mandrel 40 is not necessary.

Then, after the cut piece 50 is formed, the cut piece 50 is pushed into the case 11 to drop the cut piece 50 into the case 11.
If the contact surface 46a of the flange 46 and the outer wall surface 13c of the lid 13 are in close contact and the periphery of the liquid injection port 13d can be sealed, the sealing member 25 may be omitted.

The seal member 25 may be made of rubber or O-ring other than resin.
In the embodiment, the liquid injection port 13d is provided in the lid 13 as the wall portion of the case 11, but the wall portion is used as the side wall of the case main body 12, and the liquid injection port and the sealing member 44 are provided in the side wall of the case main body 12. May be.

In the sealing member 44, the flange 46 may be an annular shape instead of a hexagonal shape.
The secondary battery 10 is a lithium ion secondary battery, but is not limited thereto, and may be another secondary battery. In short, any material may be used as long as ions move between the positive electrode active material and the negative electrode active material and transfer charge.

  The power storage device may be embodied as an electric double layer capacitor or the like.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery as an electrical storage device, 11 ... Case, 13 ... Lid as a wall part, 13c ... Outer wall surface, 13d ... Liquid injection port, 14 ... Electrode assembly, 44 ... Sealing member, 45 ... Trunk part 45a ... bottom, 46 ... flange, 48 ... caulking part, 50 ... cut piece.

Claims (5)

Case and
An electrode assembly and an electrolyte contained in the case;
A method of manufacturing a power storage device having a liquid injection port for the electrolytic solution provided on a wall of the case,
Injecting the electrolytic solution into the case from the liquid injection port;
Temporarily sealing the liquid injection port with a sealing member;
Removing the sealing member from the liquid inlet and releasing the gas in the case from the liquid inlet;
Sealing the liquid injection port after releasing the gas, and
The sealing member is a body made of a non-conductive material;
A flange extending from the body,
In the step of temporarily sealing the liquid injection port with a sealing member, the sealing member is inserted into the liquid injection port in a state where the bottom portion of the body portion is located in the case, and the flange is The liquid injection port is temporarily sealed in a state of being locked to the outer wall surface of the wall,
In the step of releasing the gas, the method for manufacturing a power storage device in which the sealing member is cut and the barrel portion is dropped into the case from the bottom side to open the liquid injection port.   The step of temporarily sealing the liquid injection port with a sealing member is to increase the diameter of the portion located on the bottom side of the body portion and in the case from the inside until the diameter becomes larger than the liquid injection port. The method for manufacturing a power storage device according to claim 1, wherein the method is performed by forming a caulking portion.   3. The main sealing of the liquid injection port according to claim 1, wherein the liquid injection port is fully sealed with a sealing member different from the sealing member temporarily sealing the liquid injection port in the step of main sealing the liquid injection port. Manufacturing method of power storage device. Case and
An electrode assembly and an electrolyte contained in the case;
An inlet for the electrolyte provided in the wall of the case;
The electrolyte is injected into the case from the liquid injection port, and after temporarily sealing the liquid injection port with a sealing member, the sealing member is removed from the liquid injection port, and the liquid injection port After discharging the gas in the case, a power storage device formed by sealing the liquid injection port,
The sealing member is made of a non-conductive material and has a cylindrical body with a bottom;
A flange extending from the body,
The electrical storage apparatus which has the cut piece produced by cut | disconnecting the said trunk | drum in order to remove the said sealing member from the said liquid injection port in the said case.   The power storage device according to claim 4, wherein the power storage device is a secondary battery.