JP6090571B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage equipment comprising an injection hole in the electrode terminal.

  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 an electrode assembly and an electrolytic solution are accommodated in the case, and an electrode terminal for taking out electricity from the electrode assembly is provided in the electrode assembly. It is connected. The secondary battery is manufactured by housing the electrode assembly in the main body member of the case, welding the lid member of the case to the main body member, forming the case, and then supplying the electrolytic solution from the injection hole of the lid member into the case. And the injection hole is sealed.

  By the way, it is desired to seal the liquid injection hole without welding the sealing member to the lid member. For example, Patent Document 1 discloses a sealing method other than welding. As shown in FIG. 9, in the secondary battery, a liquid injection hole 80 is formed in a rivet (electrode terminal) 81, and the liquid injection hole 80 is a screw hole. By inserting a member 82, the liquid injection hole 80 is sealed by a method other than welding.

  Further, when the secondary battery is mounted on an EV or the like, the secondary battery is used as a battery pack in which a plurality of secondary batteries are connected by a conductive member. As a method for fixing the conductive member to the electrode terminal, it is conceivable to insert the screw 82 into a through hole formed in the conductive member and sandwich the conductive member between the screw 82 and the rivet 81. In this case, the liquid injection hole can be sealed while fixing the conducting member to the electrode terminal with the screw 82 as a fixing member.

JP 11-339769 A

  By the way, in a secondary battery or capacitor using a non-aqueous electrolyte, the operations from the injection of the electrolyte to the sealing of the injection hole are performed in a dry room to prevent moisture from entering the case from the injection hole. It is done in such a special place. For this reason, if the fixing member also serves to seal the liquid injection hole, the conductive member must be fixed simultaneously with the sealing of the liquid injection hole, and the conductive member is also fixed in a place such as a dry room. It must be made.

The present invention provides a power storage device capable of separately sealing a liquid injection hole and fixing a conductive member while using the female thread portion of the liquid injection hole for sealing the liquid injection hole and fixing the conductive member. Is to provide a place.

In order to solve the above-described problem, the power storage device according to claim 1, wherein an electrode assembly and an electrolytic solution are accommodated in a case, the electrode assembly includes a pole column portion protruding from a wall portion of the case. An electrode terminal electrically connected to the electrode terminal and having a liquid injection hole penetrating the electrode terminal in the axial direction of the pole column part, wherein the liquid injection hole is a screw hole having a female screw part. A sealing member that is screwed into the female screw portion and seals the liquid injection hole, and is screwed into the female screw portion outside the sealing member, and the pole column portion outside the case the conductive member which conducts to be secured to the pole portion have a fixed member, together with the sealing member has external threads for sealing, the fixing member has a fixing male screw portion, the sealing The male screw portion for fixing and the male screw portion for fixing are arranged in the axial direction of the pole column portion. And summarized in that screwed into the female screw portion which is the same diameter I.

  According to this, the female screw part of the liquid injection hole is used for sealing the liquid injection hole and fixing the conductive member, but for sealing the liquid injection hole, the sealing member is screwed onto the female screw part. The conducting member is fixed by screwing the fixing member into the female screw portion. Therefore, sealing of the injection hole and fixing of the conducting member can be performed separately using different members, and there is no need to fix the conducting member simultaneously with sealing of the injection hole. There is no need to fix it in a special place such as a dry room.

  According to this, when the liquid injection hole is formed in the electrode terminal, it is not necessary to change the hole diameter of the female screw part in accordance with the male screw part for sealing and the male screw part for fixing, so the liquid injection hole can be easily formed. it can.

  Further, in the power storage device, the electrode terminal includes a restricting portion that reduces a diameter toward a central axis of the liquid injection hole and restricts the movement of the sealing member toward the inside of the case. A seal member that seals between the liquid injection hole and the sealing member may be supported.

  According to this, when the sealing member is screwed into the female screw portion with the sealing member supported by the restricting portion, the sealing member is crushed as the sealing member is screwed, and the sealing member is sealed. Close to the member and the regulating part. Therefore, the liquid injection hole can be reliably sealed simultaneously with the screwing of the sealing member.

  Further, in the power storage device, the sealing member has a sealing male screw portion, and has a shaft portion that is smaller in diameter than the sealing male screw portion and closer to the inside of the case than the sealing male screw portion. The liquid injection hole has a smaller diameter than the female screw portion and an insertion hole through which the shaft portion is inserted closer to the inside of the case than the female screw portion, and the shaft portion has a space between the insertion hole. A sealing member for sealing may be attached.

  According to this, the liquid injection hole is sealed by the sealing member closer to the inside of the case than the sealing male screw portion. For this reason, even if the screwed state of the male screw part for sealing and the female screw part is loosened, the state where the liquid injection hole is sealed by the seal member can be maintained.

The power storage device is a secondary battery .

  According to the present invention, the liquid injection hole can be sealed and the conduction member can be fixed separately while the female thread portion of the liquid injection hole is used for sealing the liquid injection hole and fixing the conduction member. .

The disassembled perspective view which shows the secondary battery of embodiment. The perspective view which shows the external appearance of the secondary battery of embodiment. Sectional drawing which shows the state which screwed the sealing member and the fixing member in the liquid injection hole of the positive electrode terminal. The perspective view which shows a battery pack. Sectional drawing which shows an injection process. Sectional drawing which shows the state which sealed the liquid injection hole with the sealing member. Sectional drawing which shows another example of a liquid injection hole and a sealing member. Sectional drawing which shows another example of a liquid injection hole and a sealing member. The figure which shows background art.

Hereinafter, a first embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
As shown in FIGS. 1 to 3, in the secondary battery 10, an electrode assembly 20 and an electrolytic solution 18 are accommodated in a metal case 12. The case 12 includes a rectangular parallelepiped case main body 13 having an opening 13 d and a rectangular flat plate-shaped lid 14 that closes the opening 13 d of the case main body 13. The case body 13 and the lid 14 are both made of metal (for example, stainless steel or aluminum), and the case body 13 and the lid 14 are joined by laser welding. Further, the secondary battery 10 of the present embodiment is a square battery whose outer periphery forms a square shape, and is a lithium ion battery that uses a non-aqueous electrolyte as the electrolyte 18.

  The electrode assembly 20 includes a positive electrode 21, a negative electrode 22, and a separator that insulates the positive electrode from the negative electrode. The positive electrode 21 includes a positive electrode active material on both surfaces of a positive metal foil (aluminum foil). The negative electrode 22 includes a negative electrode active material on both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 20 has a laminated structure in which a plurality of positive electrodes 21 and a plurality of negative electrodes 22 are alternately laminated, and a separator is interposed between the two electrodes.

  The positive electrode 21 has a positive current collecting tab 31 on a part of one side (long side), and the negative electrode 22 has a negative current collecting tab 32 on a part of one side (long side). The plurality of positive electrodes 21 are stacked such that the respective positive electrode current collecting tabs 31 are arranged in a line along the stacking direction. Similarly, the plurality of negative electrode electrodes 22 are stacked such that the respective negative electrode current collecting tabs 32 are arranged in a row along the stacking direction so as not to overlap the positive electrode current collecting tabs 31. The electrode assembly 20 includes a positive electrode tab group 45 formed by collecting positive electrode current collecting tabs 31. At least the outermost positive electrode current collecting tab 31 of the positive electrode tab group 45 is welded to the positive electrode conductive member 33. The electrode assembly 20 includes a negative electrode tab group 46 formed by collecting the negative electrode current collecting tabs 32. At least the outermost negative electrode current collecting tab 32 of the negative electrode tab group 46 is welded to the negative electrode conductive member 37.

  A positive electrode terminal 41 as an electrode terminal is welded to the positive electrode conductive member 33, and a negative electrode terminal 42 as an electrode terminal is welded to the negative electrode conductive member 37. The positive electrode terminal 41 and the negative electrode terminal 42 exchange electricity with the electrode assembly 20. Each of the positive electrode terminal 41 and the negative electrode terminal 42 has a base portion 43 having a square plate shape. A cylindrical pole post 44 is erected from the center of the base 43 and has an external thread 44 a on the outer peripheral surface of the pole post 44. In the base portion 43, a surface facing the inner surface 14 a of the lid 14 is a seat surface 43 a, and a surface opposite to the seat surface 43 a in the thickness direction of the base portion 43 is an assembly side end surface 43 b.

  As shown in FIGS. 1 and 3, a resin terminal cover 50 is attached to the base 43. The terminal cover 50 includes a lid-side insulating plate 51 disposed between the seating surface 43 a of the base portion 43 and the inner surface 14 a of the lid 14. The lid-side insulating plate 51 has a U-shaped insertion part 51a in a plan view into which the pole part 44 is inserted. The lid-side insulating plate 51 includes a case-side insulating plate 52 at an end opposite to the opening edge of the insertion portion 51a, and the case-side insulating plate 52 extends in a direction away from the lid. The case side insulating plate 52 has a rectangular plate shape and extends perpendicularly to the lid side insulating plate 51. In the case-side insulating plate 52, an assembly-side insulating plate 53 extends in the same direction as the lid-side insulating plate 51 and along the assembly-side end surface 43 b at the distal end on the side away from the lid 14. The case side insulating plate 52 is formed in a rectangular plate shape.

  The pole column portion 44 is inserted into the insertion portion 51 a of the lid side insulating plate 51, and the lid side insulating plate 51 surrounds almost the entire circumference of the pole column portion 44. The lid-side insulating plate 51 is supported on the seating surface 43 a of the base 43. An O-ring 56 is provided on the seating surface 43 a of the base portion 43 so as to surround the pole column portion 44. The assembly-side insulating plate 53 is disposed closer to the electrode assembly 20 than the assembly-side end surface 43b of the base portion 43, and extends along the assembly-side end surface 43b. The assembly-side insulating plate 53 is interposed between the base portion 43 and the electrode assembly 20.

  The lid 14, the positive terminal 41, and the negative terminal 42 are electrically insulated by the lid-side insulating plate 51 in the terminal cover 50. In addition, the case main body 13 is electrically insulated from the positive terminal 41 and the negative terminal 42 by the case-side insulating plate 52. Further, the assembly side insulating plate 53 electrically insulates the electrode assembly 20 from the positive terminal 41 and the negative terminal 42.

  The pole portion 44 penetrates through the through hole 14 b of the lid 14 and protrudes (exposes) outside the case 12. Therefore, in this embodiment, the lid 14 constitutes the wall portion of the case 12. The inner peripheral surface of the through-hole 14 b of the lid 14 and the outer peripheral surface of the pole post 44 are insulated by the insulating member 19. The insulating member 19 includes a tubular portion 24 and a flange portion 25 provided at one end edge in the axial direction of the tubular portion 24. The cylindrical portion 24 is interposed between the inner peripheral surface of the through hole 14 b and the outer peripheral surface of the pole column portion 44. The flange portion 25 is locked around the through hole 14 b on the outer surface 14 c of the lid 14.

  A nut 55 is screwed into the male screw portion 44 a of the pole column portion 44. The flange portion 25 of the insulating member 19 is clamped between the outer surface 14 c of the lid 14 and the nut 55, and the nut 55 and the lid 14 are insulated by the flange portion 25. Further, between the nut 55 and the base portion 43, the flange portion 25, the lid 14, the O-ring 56, and the lid-side insulating plate 51 are narrowed, and the positive terminal 41 and the negative terminal 42 are fixed to the lid 14. In this fixed state, the O-ring 56 is in close contact with the inner surface 14a of the lid 14 and the seating surface 43a of the base portion 43 in a compressed state, and seals the periphery of the through hole 14b.

Next, the liquid injection hole 47 of the positive electrode terminal 41 will be described in detail.
As shown in FIG. 3, the positive electrode terminal 41 includes a liquid injection hole 47 that penetrates the positive electrode terminal 41 along the axial direction of the pole column portion 44. Further, the positive electrode terminal 41 includes an annular regulating portion 49 on the assembly side end face 43 b side of the base portion 43. The restricting portion 49 reduces the diameter of the liquid injection hole 47 toward the central axis L of the liquid injection hole 47. Further, an O-ring 40 as a seal member is attached to the restricting portion 49.

  The liquid injection hole 47 is a screw hole having a female screw portion 47a in the entire portion of the inner peripheral surface excluding the restricting portion 49. Further, in the liquid injection hole 47, the female screw portion 47 a is formed with the same diameter along the axial direction of the pole column portion 44. The liquid injection hole 47 is sealed by a cylindrical sealing member 48.

  As shown in FIG. 1, the sealing member 48 has a male screw portion 48 a for sealing which is screwed into the female screw portion 47 a on the outer peripheral surface. The sealing member 48 has a tool locking groove 48b on one end surface in the axial direction. As shown in FIG. 3, the other end surface of the liquid injection hole 47 in the axial direction is in close contact with the O-ring 40, and the space between the restricting portion 49 and the liquid injection hole 47 is sealed by the O-ring 40.

  As shown in FIG. 4, each secondary battery 10 has a conductive member 60 on the negative electrode terminal 42 of the secondary battery 10 adjacent to the positive electrode terminal 41 and on the positive electrode terminal 41 of the secondary battery 10 adjacent to the negative electrode terminal 42. A battery pack 71 as a power storage module is configured by the plurality of connected secondary batteries 10.

  As shown in FIG. 1, the conductive member 60 that electrically connects the secondary batteries 10 is a rectangular plate shape and includes a pair of insertion portions 60 a. In the liquid injection hole 47 of the positive electrode terminal 41, the fixing member 61 is screwed into the female screw portion 47 a outside the sealing member 48, and the conduction member 60 is fixed to the pole column portion 44 by the fixing member 61. Yes. The fixing member 61 includes a fixing male screw portion 61a that is screwed into the female screw portion 47a, and a head portion 61b at one end in the axial direction of the fixing male screw portion 61a.

  The negative electrode terminal 42 is fixed to the conductive member 60 in the same manner as the positive electrode terminal 41, but the liquid injection hole 47 is not formed. For this reason, in the negative electrode terminal 42, the lower part of the internal thread part 47a is obstruct | occluded, and the sealing member 48 is not arrange | positioned.

Next, the manufacturing method of the secondary battery 10 will be described together with the operation.
The method for manufacturing the secondary battery 10 includes a step of injecting the electrolytic solution 18, a step of temporarily sealing the injection hole 47, an aging step, and a step of releasing the gas generated in the aging step out of the case 12. All steps are performed in a dry room in order to prevent moisture from entering the case 12.

As shown in FIG. 5, the step of injecting the electrolytic solution 18 from the liquid injection hole 47 into the case 12 is performed with the liquid injection hole 47 opened.
Thereafter, as shown in FIG. 6, the sealing member 48 is inserted into the liquid injection hole 47, a tool (not shown) is locked in the tool locking groove 48b, and the tool is operated to seal the male screw. The portion 48a is screwed into the female screw portion 47a. The sealing member 48 is screwed until the other end surface in the axial direction of the sealing member 48 is in close contact with the O-ring 40 on the restricting portion 49, and the screwing of the sealing member 48 is restricted by the restricting portion 49. Then, the liquid injection hole 47 is temporarily sealed by the sealing member 48, and the step of temporarily sealing the liquid injection hole 47 is completed.

  In the temporarily sealed state, the space between the liquid injection hole 47 and the sealing member 48 is sealed by the O-ring 40. And the aging process of the secondary battery 10 is performed in a temporary sealing state. Then, gas is generated by the reaction between the electrolytic solution 18 and each active material in the electrode assembly 20. At this time, since the liquid injection hole 47 is sealed by the sealing member 48, the gas is prevented from leaking out of the case 12 from the liquid injection hole 47.

  Next, a tool (not shown) is locked in the tool locking groove 48 b, and the tool is operated to screw the sealing male screw portion 48 a of the sealing member 48 from the female screw portion 47 a of the liquid injection hole 47. The sealing member 48 is extracted from the liquid injection hole 47 and the liquid injection hole 47 is opened. Then, the gas generated in the aging process is released from the liquid injection hole 47 to the outside of the case 12.

  After the step of releasing the gas, a tool (not shown) is locked in the tool locking groove 48b, and the tool is operated so that the sealing male thread portion 48a of the sealing member 48 is replaced with the female thread of the liquid injection hole 47. Screw again into the portion 47a. The sealing member 48 is screwed until the other end surface in the axial direction of the sealing member 48 is in close contact with the O-ring 40 on the restricting portion 49, and the screwing of the sealing member 48 is restricted by the restricting portion 49.

Then, as shown in FIG. 6, the liquid injection hole 47 is fully sealed by the sealing member 48, and the step of fully sealing the liquid injection hole 47 is completed. As a result, the secondary battery 10 is manufactured.
Next, the manufacturing method of the battery pack 71 will be described together with the operation.

  As shown in FIG. 4, a plurality of secondary batteries 10 are connected by a conductive member 60 to manufacture a battery pack 71. It is not necessary to manufacture the battery pack 71 in a dry room. Among the adjacent secondary batteries 10, the conduction member 60 is supported on the distal end surface of the positive electrode terminal 41 of one secondary battery 10, and the same conduction member 60 is disposed on the distal end surface of the negative electrode terminal 42 of the other secondary battery 10. To support.

  Then, as shown in FIG. 3, the fixing male screw portion 61 a of the fixing member 61 is screwed into the female screw portion 47 a outside the sealing member 48, and the conduction member 60 is connected to the pole column portion 44 by the head portion 61 b. And pressing the periphery of the insertion portion 60 a against the tip surface of the polar column portion 44. Then, the conductive member 60 is fixed to the positive electrode terminal 41 and the negative electrode terminal 42 by the fixing member 61, and the process of fixing the conductive member 60 to the polar column portion 44 is completed.

As a result, the secondary batteries 10 are electrically connected to each other by the conductive member 60, and the battery pack 71 is manufactured.
According to the above embodiment, the following effects can be obtained.

  (1) The positive electrode terminal 41 includes a liquid injection hole 47 penetrating in the axial direction, and the liquid injection hole 47 has a female screw portion 47a. The female screw portion 47 a of the liquid injection hole 47 is used for sealing the liquid injection hole 47 and fixing the conduction member 60. However, the injection hole 47 can be sealed with the sealing member 48, and the conduction member 60 can be fixed with the fixing member 61. The series of sealing of the injection hole 47 and the fixation of the conduction member 60 can be performed. Can be done separately. Therefore, it is not necessary to fix the conducting member 60 at the same time as sealing the liquid injection hole 47, and there is no trouble as in the case where the conducting member 60 is fixed, in other words, the battery pack 71 is assembled in a dry room.

  (2) Sealing of the liquid injection hole 47 is performed by screwing the sealing member 48. For this reason, the electrode assembly 20 does not receive the influence of the welding failure which arises when welding a sealing member to a lid | cover, and the heat of welding.

  (3) A liquid injection hole 47 was formed in the positive terminal 41. The positive electrode terminal 41 is a member that electrically connects the electrode assembly 20 in the case 12 and the conductive member 60 outside the case 12, and the length of the positive electrode terminal 41 along the axial direction of the pole column portion 44 is It is longer than the thickness of the lid 14. Therefore, the screwing distance of the sealing member 48 can be secured longer than in the case of forming the screw hole liquid injection hole in the lid 14, and the liquid injection hole 47 can be reliably sealed. Further, the thickness of the lid 14 is not increased in order to secure the screwing distance.

  (4) The female thread portion 47 a of the liquid injection hole 47 has the same diameter along the axial direction of the pole column portion 44. For this reason, when the liquid injection hole 47 is formed in the positive electrode terminal 41, it is not necessary to change the hole diameter of the female screw part 47a in accordance with the sealing male screw part 48a and the fixing male screw part 61a. Can be formed.

  (5) The liquid injection hole 47 includes a restricting portion 49, and an O-ring 40 is attached to the restricting portion 49. For this reason, when the sealing member 48 is screwed into the female screw portion 47 a, the O-ring 40 can be crushed at the other axial end surface of the sealing member 48. Accordingly, the O-ring 40 can be brought into close contact with the sealing member 48 and the restricting portion 49, and the space between the liquid injection hole 47 and the sealing member 48 can be easily and reliably sealed by the O-ring 40.

In addition, you may change the said embodiment as follows.
As shown in FIG. 7, the sealing member 48 may include a shaft portion 48d that is smaller in diameter than the sealing male screw portion 48a and that is disposed closer to the inside of the case 12 than the sealing male screw portion 48a. Good. In this case, a seal member 48f is attached to the outer peripheral surface of the shaft portion 48d. The liquid injection hole 47 includes an insertion hole 47b through which the shaft portion 48d is inserted with a smaller diameter than the female screw portion 47a and closer to the inside of the case 12 than the female screw portion 47a.

  According to this, the sealing male screw portion 48a is screwed into the female screw portion 47a in a state where the shaft portion 48d is inserted through the insertion hole 47b, and the sealing member 48 is sealed by the sealing member 48. At this time, the seal member 48f is in close contact with the outer peripheral surface of the shaft portion 48d and the inner peripheral surface of the insertion hole 47b, and seals the liquid injection hole 47 closer to the inside of the case 12 than the male screw portion 48a for sealing.

  For this reason, even if the male screw part 48a for sealing and the female screw part 47a are loosened, the liquid injection hole 47 can be kept sealed by the seal member 48f. Further, the seal member 48f is in close contact with the outer peripheral surface of the shaft portion 48d and the inner peripheral surface of the insertion hole 47b while being crushed in the radial direction. For this reason, the sealing member 48 is less likely to move in the axial direction due to the force of returning to the state before the seal member 48f is crushed, and the sealing male screw portion 48a is unlikely to be screwed off from the female screw portion 47a. The state in which the liquid injection hole 47 is sealed by the sealing member 48 can be maintained.

The seal member 48f may be attached to the inner peripheral surface of the insertion hole 47b.
As shown in FIG. 8, the liquid injection hole 47 has a first female screw portion 57 a penetrating the base 43 on the assembly side end surface 43 b side in the axial direction of the pole column portion 44, and a first female screw portion 57 a. It may have the 2nd internal thread part 57b which penetrates pole pole part 44 outside outside. That is, the liquid injection hole 47 may have a female thread portion having a different diameter in the axial direction of the pole column portion 44.

  The liquid injection hole 47 includes a restriction portion 57c at the boundary between the first female screw portion 57a and the second female screw portion 57b, and a seal member 58 is supported by the restriction portion 57c. The sealing member 48 has a bolt shape, and has a male screw portion 48a for sealing on the outer peripheral surface of the rod-shaped portion 48h, and a head 48g having a diameter larger than that of the rod-shaped portion 48h and smaller than that of the second female screw portion 57b. Have. The sealing member 48 has the head 48g in close contact with the sealing member 58 on the restricting portion 57c, and the sealing male screw portion 48a is the first until the screwing of the sealing member 48 is restricted by the restricting portion 57c. Are screwed into the female thread portion 57a.

  When configured in this manner, when the sealing male screw portion 48a of the sealing member 48 is screwed into the first female screw portion 57a, the sealing member 48 is inserted into the second female screw portion 57b. At this time, the sealing male screw portion 48a can be inserted up to the first female screw portion 57a without being screwed into the second female screw portion 57b. Therefore, as compared with the case where the sealing member 48 is screwed up to the first female screw portion 57a, the sealing member 48 can be positioned earlier to the first female screw portion 57a.

  In the embodiment, the liquid injection hole 47 is provided in the positive electrode terminal 41, but the liquid injection hole 47 may be provided only in the negative electrode terminal 42. Further, the liquid injection hole 47 may be provided in both the positive electrode terminal 41 and the negative electrode terminal 42. In this case, parts can be shared on the positive electrode side and the negative electrode side.

The conductive member 60 may be a cable instead of a plate.
○ After the main sealing step, the fixing member 61 may be screwed into the liquid injection hole 47 without fixing the conducting member 60.

In the step of temporarily sealing, in addition to the sealing member 48, the fixing member 61 may be screwed into the female screw portion 47a.
In the embodiment, the liquid injection hole 47 is provided in the lid 14 as the wall portion of the case 12, but the wall portion may be the side wall of the case main body 13 and the liquid injection hole may be provided in the side wall of the case main body 13.

The electrode assembly 20 may be a wound type wound with a separator interposed between the positive electrode 21 and the negative electrode 22.
The secondary battery 10 is a lithium ion secondary battery, but is not limited thereto, and may be a secondary battery or a capacitor using another nonaqueous electrolyte. In short, any power storage device that requires work in a dry room has the same effect as the above embodiment.

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

  L ... center axis, 10 ... secondary battery as power storage device, 12 ... case, 14 ... lid as wall, 18 ... electrolyte, 20 ... electrode assembly, 40 ... O-ring as seal member, 41 ... electrode Positive terminal as terminal, 42 ... Negative electrode terminal as electrode terminal, 44 ... Polar column part, 47 ... Injection hole, 47a ... Female screw part, 47b ... Insertion hole, 48 ... Sealing member, 48a ... Male screw part for sealing , 48d ... shaft portion, 48f, 58 ... sealing member, 49, 57c ... regulating portion, 60 ... conducting member, 61 ... fixing member, 61a ... male screw portion for fixing, 71 ... battery pack as a power storage module.

Claims (4)

The electrode assembly and the electrolyte are accommodated in the case,
An electrical storage device having an electrode terminal protruding from a wall of the case and having an electrode terminal electrically connected to the electrode assembly, the electrode terminal having a liquid injection hole penetrating in the axial direction of the pole column A device,
The liquid injection hole is a screw hole having a female screw part,
It has a sealing member that is screwed into the female screw portion and seals the liquid injection hole, is screwed into the female screw portion outside the sealing member, and is attached to the pole column portion outside the case. A fixing member capable of fixing a conductive member capable of conduction to the pole portion;
The sealing member has a male screw part for sealing, the fixing member has a male screw part for fixing, and the male screw part for sealing and the male screw part for fixing are along the axial direction of the pole column part. A power storage device , wherein the power storage device is screwed into the female screw portion having the same diameter. The electrode terminal includes a restricting portion that reduces the diameter toward the central axis of the liquid injection hole and restricts the movement of the sealing member toward the inside of the case, and the liquid injection hole and the restriction member are provided in the restriction portion The power storage device according to claim 1 , wherein a sealing member that seals between the sealing member and the sealing member is supported. The sealing member has a male screw part for sealing, and includes a shaft part that is smaller in diameter than the male screw part for sealing and closer to the inside of the case than the male screw part for sealing, and the liquid injection hole Is provided with an insertion hole through which the shaft portion is inserted with a smaller diameter than the female screw portion and closer to the inside of the case than the female screw portion, and a seal member that seals between the insertion hole is attached to the shaft portion The power storage device according to claim 1 . The power storage device according to any one of claims 1 to 3 , wherein the power storage device is a secondary battery.