JP2017139125A - Power storage device manufacturing method and temporary sealing stopper for liquid injection port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device manufacturing method and a temporary sealing stopper for a liquid injection port that are capable of improving the sealing quality of a main sealing member.SOLUTION: A shaft portion 40 of a temporary sealing stopper 30 is inserted into a liquid injection port 18 to seal the inner surface of the liquid injection port with an outer peripheral surface of a diameter-reduced portion 41 of the shaft portion 40 of the temporary sealing stopper 30. Temporary sealing is performed by sealing the inner surface of the liquid injection port with the outer peripheral surface of a diameter-increased portion 42 of the shaft portion 40 of the temporary sealing stopper 30. Thereafter, the temporary sealing stopper 30 is pushed into the liquid injection port 18 to seal the inner surface of the liquid injection port with the outer peripheral surface of the diameter-increased portion 42, gas is discharged through intercommunication holes 60 and 61 while a sealing-scheduled portion P10 of a main sealing member around the liquid injection port 18 in the case 11 is covered with a flange portion 50, the temporary sealing stopper 30 is removed from the liquid injection port 18, and the main sealing member is sealed to the case 11 by the sealing-scheduled portion P10 to perform full sealing.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a power storage device in which an electrode assembly and an electrolytic solution are accommodated in a case having a liquid injection port, and a temporary sealing plug for the liquid injection port.

  In the temporary sealing jig and the method of manufacturing the power storage device disclosed in Patent Document 1, as shown in FIG. 9A, after the power generation element is accommodated in the sealed outer casing 100, the outer casing 100 is sealed. The electrolyte is injected from the liquid injection hole 102 provided in the stop seat 101, the liquid injection hole 102 is temporarily sealed with the resin films 103 and 104, and the battery is adjusted. Then, after forming the through holes 103a and 104a and releasing the temporary sealing, the liquid injection hole 102 is fully sealed with a cap material 110 as shown in FIG. 9B. Here, the temporary sealing is performed by sequentially sealing the resin films 103 and 104 around the liquid injection hole 102 at the sealing positions P1 and P2, and the main sealing is performed by sealing the resin films 103 and 104. The sealing is performed by sealing the cap material 110 around the liquid injection hole 102 at the sealing position P3 outside the positions P1 and P2 that are attached.

JP 2007-323882 A

  Incidentally, there is a demand for further improvement in sealing quality of the sealing member. Specifically, when the gas is vented as shown in FIG. If it adheres, there is a possibility that the quality of the sealing will be lowered when the cap material 110 shown in FIG. 9B is sealed.

  An object of the present invention is to provide a method of manufacturing a power storage device capable of improving the sealing quality of the sealing member, and a temporary sealing plug of a liquid inlet.

  The invention according to claim 1 is a method of manufacturing a power storage device in which an electrode assembly and an electrolytic solution are accommodated in a case having a liquid injection port, wherein the shaft portion of the temporary sealing plug is placed in the liquid injection port. And sealing the inner surface of the liquid inlet with at least the outer peripheral surface of the reduced diameter portion of the shaft portion of the temporary sealing plug in a state where the flange portion of the temporary sealing plug is separated from the outer surface of the case. Temporary sealing step for temporarily sealing the liquid injection port, and after the temporary sealing step, the temporary sealing plug is pushed into the liquid injection port and the outer peripheral surface of the enlarged diameter portion of the shaft portion of the temporary sealing plug The inner surface of the liquid injection port is sealed, and the flange portion covers the planned sealing portion of the main sealing member around the liquid injection port in the case, and the case is formed through the communication hole formed in the temporary sealing plug. A degassing step of communicating the inside and outside of the case to discharge the gas in the case out of the case, and the degassing process Later, the temporary sealing plug is removed from the liquid injection port, and the main sealing step is performed to seal the liquid injection port by sealing the sealing member to the case at the sealing scheduled portion. It is summarized as having.

  According to the first aspect of the present invention, in the temporary sealing step, the inner surface of the liquid injection port is sealed with at least the outer peripheral surface of the reduced diameter portion of the shaft portion of the temporary sealing plug, and in the degassing step, the temporary sealing plug is sealed. The inner surface of the liquid injection port is sealed with the outer peripheral surface of the enlarged diameter portion of the shaft portion, and the flange portion is formed on the temporary sealing plug in a state where the sealing portion of the main sealing member around the liquid injection port in the case is covered. Gas is extracted through the formed communication hole. Therefore, it is possible to prevent the electrolytic solution from adhering to the planned sealing portion of the main sealing member when degassing, and to improve the sealing quality of the main sealing member.

  According to a second aspect of the present invention, there is provided a temporary sealing plug for an injection port of a power storage device in which an electrode assembly and an electrolyte solution are accommodated in a case having an injection port for an electrolyte solution, A shaft portion that is inserted movably and has an outer peripheral surface serving as a seal portion with the inner surface of the liquid injection port, and a flange portion provided on the shaft portion outside the case, the shaft portion having a reduced diameter In the state where the flange portion is spaced from the outer surface of the case, at least the outer peripheral surface of the reduced diameter portion is sealed from the inner surface of the liquid injection port, and the outer peripheral surface of the reduced diameter portion The communication hole has a communication hole extending in the axial direction of the shaft portion and opening at the upper surface. The communication hole seals the outer peripheral surface of the enlarged diameter portion with the inner surface of the liquid injection port, and the flange portion is the liquid injection port in the case. The inside and outside of the case communicate with each other in a state of covering the planned sealing portion of the main sealing member around The gist of the door.

  According to the second aspect of the present invention, at least the outer peripheral surface of the reduced diameter portion can be temporarily sealed with the inner surface of the liquid injection port. The outer peripheral surface of the enlarged diameter portion is sealed from the inner surface of the liquid injection port, and the inside and outside of the case is communicated through the communication hole with the flange portion covering the planned sealing portion around the liquid injection port in the case. Can degas. Therefore, it is possible to prevent the electrolytic solution from adhering to the planned sealing portion of the main sealing member when degassing, and to improve the sealing quality of the main sealing member.

  According to the present invention, it is possible to improve the sealing quality of the sealing member.

The perspective view which shows the secondary battery in embodiment. The manufacturing process figure of a secondary battery. (A), (b) is a perspective view of a temporary sealing stopper. (A) is a top view of a temporary sealing stopper, (b) is sectional drawing in the AA of (a). The partial cross section figure of the secondary battery for demonstrating a temporary sealing process. The partial cross section figure of the secondary battery for demonstrating a degassing process. The partial cross section figure of the secondary battery for demonstrating this sealing process. (A) is a partial top view of the secondary battery for demonstrating this sealing process, (b) is a partial sectional view of the secondary battery for demonstrating this sealing process. (A), (b) is a partial cross section figure of the secondary battery for demonstrating background art and a subject.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a secondary battery 10 as a power storage device includes a case 11 made of metal (aluminum in the present embodiment), and an electrode assembly 12 and an electrolytic solution (not shown) are accommodated in the case 11. Has been. The case 11 includes a bottomed square cylindrical case body 13 and a rectangular flat plate-like lid body 14 that closes an opening for inserting the electrode assembly 12 into the case body 13. Therefore, the secondary battery 10 of the present embodiment is a prismatic battery whose appearance is square. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.

  The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator that insulates the positive electrode and the negative electrode. The positive electrode is configured by applying a positive electrode active material to both surfaces of a positive metal foil (aluminum foil). The negative electrode is configured by applying a negative electrode active material to both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 12 has a laminated structure in which a plurality of positive electrodes and a plurality of negative electrodes are alternately laminated, and a separator is interposed between the positive electrode and the negative electrode.

  A positive electrode terminal 15 and a negative electrode terminal 16 are electrically connected to the electrode assembly 12. Each part of the positive electrode terminal 15 and the negative electrode terminal 16 is exposed to the outside of the case 11 from the lid body 14. Further, ring-shaped insulating members 17 for insulating from the case 11 are attached to the positive electrode terminal 15 and the negative electrode terminal 16, respectively.

  The lid 14 of the case 11 is provided with a liquid injection port 18 for injecting an electrolytic solution into the case 11 (case main body 13). The liquid injection port 18 is closed by a sealing member 19. Yes. The liquid injection port 18 has a circular shape.

Next, the manufacturing process of the secondary battery 10 will be described.
As shown in FIG. 2, after the process of housing the electrode assembly 12 in the case 11 is completed, an electrolytic solution is injected into the case 11 from the liquid injection port 18 (liquid injection process). Thereafter, the liquid injection port 18 is temporarily sealed with a temporary sealing member (temporary sealing step). And after electrolyte solution osmose | permeates the active material of each electrode, case 11 is restrained and initial charge is performed (initial charge process). Subsequently, the secondary battery 10 is left for a predetermined time in a state where the temperature is raised to the aging temperature (aging process). Thereafter, the gas generated in the case 11 in the aging process is discharged from the liquid injection port 18 to the outside of the case 11 (gas venting process). And the liquid injection port 18 is sealed with this sealing member (main sealing process). Further, the secondary battery 10 is self-discharged (self-discharge process). Thereby, the secondary battery 10 is completed.

The temporary sealing plug will be described with reference to FIGS. 3 (a) and 3 (b) and FIGS. 4 (a) and 4 (b).
As shown in FIG. 5, a circular counterbore 18 a is provided around the liquid injection port 18 on the outer surface (upper surface) of the lid 14 of the case 11.

  The temporary sealing plug 30 has a shaft portion 40 and a flange portion 50. The temporary sealing plug 30 is made of an elastic member, specifically a rubber material. Specifically, for example, EPDM (ethylene propylene diene rubber) can be used.

  The shaft portion 40 has a cylindrical shape. The shaft portion 40 is slidably inserted into the liquid injection port 18. The outer peripheral surface of the shaft portion 40 serves as a seal portion with the inner surface of the liquid injection port. The shaft portion 40 has a lower diameter reducing portion 41 and an upper diameter increasing portion 42. The outer peripheral surface of the reduced diameter portion 41 can slide with the liquid injection port 18 in a sealed state. At this time, the outer peripheral portion of the enlarged diameter portion 42 can slide in a sealed state with the counterbore 18a of the lid body 14 (see FIG. 5).

  The flange portion 50 has a disk shape and is provided at the upper end of the enlarged diameter portion 42 so as to protrude outward. The diameter of the flange portion 50 is larger than the diameter of the spot facing 18a of the lid body 14 (see FIG. 5). The flange portion 50 is provided on the shaft portion 40 outside the case 11. In a state where the flange portion 50 is separated from the outer surface 11a of the case 11, the outer peripheral surface of the reduced diameter portion 41 is sealed with the inner surface of the liquid inlet, and the outer peripheral surface of the enlarged diameter portion 42 is sealed with the inner surface of the liquid inlet ( (See FIG. 5).

  The temporary sealing plug 30 has communication holes 60 and 61 that extend from the outer peripheral surface of the reduced diameter portion 41 in the axial direction of the shaft portion 40 and open at the upper surface. One end side of the communication hole 60 is linearly cut in the outer peripheral surface of the reduced diameter portion 41 in the axial direction, and the other end side extends linearly in the axial direction inside the enlarged diameter portion 42. The communication hole 61 is provided at a position shifted by 180 degrees with respect to the communication hole 60. One end side of the communication hole 61 is linearly cut in the outer peripheral surface of the reduced diameter portion 41 in the axial direction, and the other end side extends linearly in the axial direction inside the enlarged diameter portion 42. In the communication holes 60 and 61, the outer peripheral surface of the enlarged diameter portion 42 is sealed with the inner surface of the liquid injection port, and the flange portion 50 covers the sealing scheduled portion P 10 of the main sealing member around the liquid injection port 18 in the case 11. In this state, the inside and outside of the case 11 are communicated (see FIG. 6).

Next, the effect | action of this embodiment is demonstrated, explaining a temporary sealing process, a degassing process, and a main sealing process in detail.
As shown in FIG. 5, in the temporary sealing step, the shaft portion 40 of the temporary sealing plug 30 is inserted into the liquid injection port 18. And while the flange part 50 of the temporary sealing plug 30 is separated from the outer surface 11a of the case 11, the inner surface of the liquid injection port is sealed by the outer peripheral surface of the reduced diameter part 41 of the shaft part 40 of the temporary sealing plug 30. The inner surface of the liquid injection port is sealed with the outer peripheral surface of the enlarged diameter portion 42 of the shaft portion 40 of the temporary sealing plug 30. Thereby, the liquid injection port 18 is temporarily sealed.

It should be noted that the diameter-enlarged portion 42 does not have to be sealed at the time of temporary sealing. In short, the temporary sealing only needs to be sealed at the outer peripheral surface of the reduced-diameter portion 41.
As shown in FIG. 6, in the gas venting process, the temporary sealing plug 30 is pushed into the liquid injection port 18. Thus, the inner surface of the liquid injection port is sealed with the outer peripheral surface of the enlarged diameter portion 42 of the shaft portion 40 of the temporary sealing plug 30. Further, the sealing portion P10 of the main sealing member around the liquid injection port 18 in the case 11 is covered with the flange portion 50. In this state, the inside and outside of the case 11 are communicated through the communication holes 60 and 61 formed in the temporary sealing plug 30. That is, in FIG. 5, the lower ends of the communication holes 60 and 61 are located in the liquid injection port 18, but in FIG. 6, the lower ends of the communication holes 60 and 61 are located in the case 11. The inside and outside of the case 11 communicate with each other. Thereby, the gas in the case 11 is discharged out of the case 11.

  If the seal on the outer peripheral surface of the reduced diameter portion 41 is released when the temporary sealing plug 30 is pushed in when shifting from temporary sealing to degassing, the outer peripheral surface of the enlarged diameter portion 42 is sealed. Good. The point is that at the time of temporary sealing, at least the outer peripheral surface of the reduced diameter portion 41 is sealed, and at the time of degassing, the seal on the outer peripheral surface of the enlarged diameter portion 42 is released and the seal on the outer peripheral surface of the reduced diameter portion 41 is released. Good.

  In the main sealing step, the temporary sealing plug 30 is removed from the liquid inlet 18 as shown in FIG. Thereafter, as shown in FIGS. 8A and 8B, the main sealing member 70 is sealed by welding it to the case 11 at the planned sealing portion P10 by laser beam irradiation or the like. The main sealing member 70 is a circular flat plate made of metal, for example, aluminum, and is welded at a sealing scheduled portion P10. Thus, the liquid injection port 18 is fully sealed.

  In this way, the temporary sealing plug 30 in which the electrolytic solution does not adhere to the sealing scheduled portion P10 of the main sealing member on the surface 11a to be main sealed at the time of degassing is used. It pushes in part and temporarily seals, and at the time of degassing after that, the temporary sealing plug 30 is pushed to the end and degassed. Thereafter, the temporary sealing plug 30 is removed. Thereby, the sealing defect of this sealing is prevented and the sealing quality of this sealing improves.

The main sealing member 70 in FIG. 8B corresponds to the sealing member 19 in FIG.
According to the above embodiment, the following effects can be obtained.
(1) As a manufacturing method of the secondary battery 10 as a power storage device in which the electrode assembly 12 and the electrolytic solution are accommodated in the case 11 having the electrolyte injection hole 18, a temporary sealing step, a degassing step, and a main seal A stopping step. In the temporary sealing step, at least the temporary sealing plug is inserted in a state where the shaft portion 40 of the temporary sealing plug 30 is inserted into the liquid injection port 18 and the flange portion 50 of the temporary sealing plug 30 is separated from the outer surface 11a of the case 11. The liquid injection port 18 is temporarily sealed by sealing the inner surface of the liquid injection port with the outer peripheral surface of the reduced diameter portion 41 of the 30 shaft portions 40. In the degassing step, after the temporary sealing step, the temporary sealing plug 30 is pushed into the liquid injection port 18 to seal the inner surface of the liquid injection port with the outer peripheral surface of the enlarged diameter portion 42 of the shaft portion 40 of the temporary sealing plug 30. The inside and outside of the case 11 communicate with each other through the communication holes 60 and 61 formed in the temporary sealing plug 30 with the flange portion 50 covering the sealing scheduled portion P10 of the main sealing member around the liquid injection port 18 in the case 11. Then, the gas in the case 11 is discharged out of the case 11. In the main sealing step, after the gas venting step, the temporary sealing plug 30 is removed from the liquid injection port 18 and the main injection member 18 is sealed by sealing the main sealing member 70 to the case 11 with the planned sealing portion P10. Seal.

  Thus, in the temporary sealing step, the inner surface of the liquid inlet is sealed with at least the outer peripheral surface of the reduced diameter portion 41 of the shaft portion 40 of the temporary sealing plug 30, and in the gas venting step, the shaft portion 40 of the temporary sealing plug 30 is sealed. The inner surface of the liquid injection port is sealed by the outer peripheral surface of the enlarged diameter portion 42 and the sealing portion P10 of the main sealing member around the liquid injection port 18 in the case 11 is covered with the flange portion 50 in a state where the temporary sealing plug is covered. Gas is extracted through the communication holes 60, 61 formed in 30. Therefore, it is possible to prevent the electrolytic solution from adhering to the planned sealing portion P10 of the main sealing member at the time of degassing, and the sealing quality of the main sealing member 70 can be improved. That is, it is possible to prevent poor sealing of the main sealing member 70 and improve the sealing quality of the main sealing member 70.

  (2) As a configuration of the temporary sealing plug 30 of the injection port of the secondary battery 10 as the power storage device in which the electrode assembly 12 and the electrolyte solution are accommodated in the case 11 having the injection port 18 of the electrolyte, The shaft portion 40 is slidably inserted into the mouth 18 and has an outer peripheral surface serving as a seal portion with the inner surface of the liquid injection port, and a flange portion 50 provided on the shaft portion 40 outside the case 11. The shaft portion 40 has a reduced diameter portion 41 and an enlarged diameter portion 42. When the flange portion 50 is separated from the outer surface 11a of the case 11, at least the outer peripheral surface of the reduced diameter portion 41 is sealed with the inner surface of the liquid injection port. The In addition, communication holes 60 and 61 extending from the outer peripheral surface of the reduced diameter portion 41 in the axial direction of the shaft portion 40 and opening at the upper surface are provided, and the outer peripheral surface of the enlarged diameter portion 42 is the inner surface of the liquid injection port. And the flange portion 50 communicates the inside and outside of the case 11 with the sealing portion P10 of the main sealing member around the liquid injection port 18 in the case 11 covered.

  Thereby, at least the outer peripheral surface of the reduced diameter portion 41 can be temporarily sealed with the inner surface of the liquid injection port. The outer peripheral surface of the enlarged-diameter portion 42 is sealed from the inner surface of the liquid injection port, and the communication hole 60, 61 in a state where the flange portion 50 covers the sealing portion P10 of the main sealing member around the liquid injection port 18 in the case 11. The case 11 can be vented by allowing the inside and outside of the case 11 to communicate with each other. Therefore, it is possible to prevent the electrolytic solution from adhering to the planned sealing portion P10 of the main sealing member at the time of degassing, and the sealing quality of the main sealing member 70 can be improved. That is, it is possible to prevent poor sealing of the main sealing member 70 and improve the sealing quality of the main sealing member 70.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The temporary sealing plug 30 has two communication holes 60 and 61, but the number of communication holes is not limited. That is, the number of communication holes may be one, or three or more.

The case 11 may be made of a metal other than aluminum, for example, stainless steel.
The positive electrode and the negative electrode may have a structure in which an active material is present on one side of the metal foil.

The electrode assembly 12 is not limited to the laminated type, and may be a wound type obtained by winding a belt-like positive electrode and a belt-like negative electrode to form a layer.
The secondary battery 10 may not be a square battery but may be a cylindrical battery.

The secondary battery 10 may be another secondary battery. In short, any ion may be used as long as ions move between the active material for the positive electrode and the active material for the negative electrode and charge is transferred.
-You may apply to the capacitor as an electrical storage apparatus.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11 ... Case, 11a ... Outer surface, 12 ... Electrode assembly, 18 ... Injection hole, 30 ... Temporary sealing plug, 40 ... Shaft part, 41 ... Reduced diameter part, 42 ... Expanded diameter part 50 ... Flange, 60 ... Communication hole, 61 ... Communication hole, 70 ... This sealing member, P10 ... Sealing planned part.

Claims (2)

A method of manufacturing a power storage device in which an electrode assembly and an electrolytic solution are housed in a case having a liquid injection port,
The shaft portion of the temporary sealing plug is inserted into the liquid injection port, and the outer periphery of at least the reduced diameter portion of the shaft portion of the temporary sealing plug in a state where the flange portion of the temporary sealing plug is separated from the outer surface of the case A temporary sealing step of temporarily sealing the liquid injection port by sealing the liquid injection port inner surface with a surface;
After the temporary sealing step, the temporary sealing plug is pushed into the liquid injection port, and the inner surface of the liquid injection port is sealed with the outer peripheral surface of the enlarged diameter portion of the shaft portion of the temporary sealing plug, and the flange portion is used as the case. The inside and outside of the case are communicated with each other through the communication hole formed in the temporary sealing plug in a state in which the planned sealing portion of the main sealing member around the liquid injection port is covered. A degassing process to be discharged;
After the degassing step, the temporary sealing plug is removed from the liquid injection port, and the main injection member is sealed by sealing the main sealing member to the case with the planned sealing portion. Process,
A method for manufacturing a power storage device, comprising: A temporary sealing plug of a liquid injection port of a power storage device in which an electrode assembly and an electrolytic solution are accommodated in a case having a liquid injection port,
A shaft portion that is slidably inserted into the liquid injection port and whose outer peripheral surface serves as a seal portion with the liquid injection port inner surface,
A flange portion provided on the shaft portion outside the case;
Have
The shaft portion has a reduced diameter portion and an enlarged diameter portion, and in a state where the flange portion is separated from the outer surface of the case, at least the outer peripheral surface of the reduced diameter portion is sealed with the inner surface of the liquid injection port,
The communication hole has a communication hole extending from the outer peripheral surface of the reduced diameter portion in the axial direction of the shaft portion and opening at the upper surface. The communication hole seals the outer peripheral surface of the enlarged diameter portion with the inner surface of the liquid injection port and the flange. A temporary sealing plug for an injection port, wherein the inside and outside of the case communicate with each other in a state in which the portion covers a sealing scheduled portion of the main sealing member around the injection port in the case.

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