JP2014229487A - Battery case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of seal performance.SOLUTION: A battery case C includes a seal member 27 adhering to the inner surface of a cover plate 11, an insulation spacer 31 abutting against the outer surface of the cover plate 11, a pressure receiving part 21 formed in an electrode terminal 16 and holding the seal member 27 between the cover plate 11 and itself, a pressing part 26 arranged to hold the insulation spacer 31 between the cover plate 11 and itself, and for compression-deforming the seal member 27 by approaching the pressure receiving part 21, and a cylinder 33 formed in the insulation spacer 31 so as to be housed in a central hole 28 of the seal member 27 and a through hole 14, and abutting against the pressure receiving part 21.

Description

  The present invention relates to a battery case.

  Patent Document 1 discloses a sealed battery in which a through hole is formed in a lid plate of a case that accommodates an electrode group and an electrolytic solution, and a headed rivet-shaped electrode terminal is passed through the through hole. In this sealed battery, an insulating plate is provided as an insulating means between a washer attached to the electrode terminal and the inner surface of the lid plate. A ring-shaped sealing member is provided between the head of the electrode terminal and the outer surface of the lid plate. The inner end portion of the electrode terminal is plastically deformed by caulking to press the washer toward the head side, and the electrode terminal is fixed to the lid plate by clamping between the washer and the head portion. And a sealing member is compressed by pinching with a washer and a head, and functions as a sealing means for preventing leakage of electrolyte solution.

JP 2009-087729 A

In the above sealed battery, the compression rate of the sealing member is not stable because it depends on the caulking amount of the electrode terminal. The fact that the compression rate of the sealing member is not stable is a concern in terms of the reliability of the sealing performance.
The present invention has been completed based on the above circumstances, and an object thereof is to improve the reliability of sealing performance.

The battery case of the present invention is
The electrode group and the electrolytic solution are accommodated to constitute a sealed battery,
A lid plate;
A through hole formed in the lid plate and penetrating the electrode terminal;
A ring-shaped seal member that is in close contact with one of the inner surface and the outer surface of the lid plate;
A ring-shaped insulating spacer that abuts against the other of the inner and outer surfaces of the lid plate;
A pressure receiving portion that is formed on the electrode terminal and sandwiches one of the sealing member and the insulating spacer with the lid plate;
A pressing portion that is arranged so as to sandwich the other of the sealing member and the insulating spacer between the lid plate and compresses and deforms the sealing member by approaching the pressure receiving portion;
The insulating spacer is formed so as to be accommodated in the center hole and the through hole of the seal member, and includes a pressure receiving portion and a cylindrical portion that contacts the side of the pressing portion that contacts the seal member. However, it has characteristics.

  Since the seal member is compressed and deformed when the pressing portion and the pressure receiving portion are brought close to each other, the compression rate of the seal member is defined by the interval between the pressure receiving portion and the pressing portion. When the cylindrical portion is stretched between the pressure receiving portion and the pressing portion, the approaching operation between the pressure receiving portion and the pressing portion is restricted, and the interval between the pressure receiving portion and the pressing portion is minimized. Since the minimum distance between the pressure receiving portion and the pressing portion is fixed depending on the dimensions of the cylindrical portion, the compression rate of the seal member is stabilized, and the reliability of the sealing performance by the seal member is improved.

Sectional drawing of the battery case of Example 1 Sectional view showing a state where electrode terminals, sealing members, and insulating spacers are temporarily assembled on the lid plate Sectional view showing the state in which the electrode terminal, seal member, and insulating spacer are fixed by tightening the fixing nut Sectional view showing the lid plate, electrode terminal, seal member, insulating spacer, and fixing nut separated Plan view of electrode terminals Top view of seal member Top view of insulating spacer

(1) The battery case of the present invention is
The seal member is arranged so as to be in close contact with the pressure receiving portion,
The cylindrical portion is arranged so as to contact the pressure receiving portion,
By positioning the electrode terminal and the seal member to each other, a positioning part that regulates relative displacement in the radial direction intersecting the penetration direction of the through hole is formed,
The cylindrical portion may be externally fitted to the electrode terminal in a state in which relative displacement in a radial direction intersecting the through direction of the through hole is restricted.
According to this configuration, when the cylindrical portion is assembled between the center hole of the sealing member and the outer periphery of the electrode terminal in a state where the sealing member is attached to the electrode terminal and the electrode terminal is inserted through the through hole, the cylindrical portion is There is no risk of interference with the edge of the center hole of the seal member.

(2) The battery case of the present invention is
In the above (1),
In a state before the seal member is compressed and deformed, an escape space may be provided between the inner periphery of the center hole of the seal member and the outer periphery of the cylindrical portion.
According to this configuration, even when the hole edge portion of the center hole bulges toward the inner peripheral side in the process of compressing and deforming the seal member, the bulge portion remains inside the escape space. There is no risk of being caught between.

(3) The battery case of the present invention is
The pressing portion is separate from the electrode terminal, and is formed on a fixing nut that is screwed into the male screw portion of the electrode terminal,
The inner periphery of the through hole and the outer periphery of the cylindrical portion are formed in a non-circular shape that can be fitted in a relative rotation restricted state,
The inner periphery of the cylindrical part and the outer periphery of the electrode terminal may be formed in a non-circular shape that can be fitted in a relative rotation restricted state.
According to this configuration, when the fixing nut is screwed into the male screw portion of the electrode terminal, the electrode terminal does not rotate, so that the fixing nut can be securely tightened.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. The battery case C according to the first embodiment is configured by assembling a case main body 10 having a bottomed cylindrical shape (box shape) with an open upper surface and a lid plate 11 that closes an opening on the upper surface of the case main body 10. The As shown in FIG. 1, the sealed battery B is configured by housing the electrode group 12 and the electrolytic solution 13 in the battery case C and assembling the pair of electrode terminals 16 to the lid plate 11. The battery case C includes a fixing nut 25 for fixing the electrode terminal 16 to the lid plate 11, a seal member 27 for preventing the electrolyte solution 13 in the battery case C from leaking, and a fixing nut. 25 and an insulating spacer 31 for electrically insulating the electrode terminal 16 and the lid plate 11 from each other.

<Lid plate 11>
The lid plate 11 is made of aluminum or an aluminum alloy and has a flat plate shape. The lid plate 11 is formed with a pair of through-holes 14 having a square shape (that is, a non-circular shape) in a planar shape (a shape viewed from above at right angles to an axis of a shaft-like portion 17 described later). A region (hole edge) surrounding the through hole 14 in the lower surface (inner surface) of the lid plate 11 is a seal surface 15.

<Electrode terminal 16 and fixing nut 25>
As shown in FIGS. 1, 3, and 5, the electrode terminal 16 includes a shaft-shaped portion 17 whose axis is directed coaxially with the through-hole 14 (up and down direction), and a base portion integrally formed at the lower end of the shaft-shaped portion 17. 20. The shaft-like portion 17 is penetrated into the through hole 14 from below (inside the lid plate 11). A male screw portion 18 is formed on the outer periphery of the region excluding the lower end portion of the shaft-like portion 17. As shown in FIG. 5, the lower end portion of the shaft-shaped portion 17 is a rotation restricting portion 19 having a square planar shape. The length dimension of one side of the rotation restricting portion 19 is the same as the outer diameter dimension (diameter) of the male screw portion 18 and is smaller than the length dimension of one side of the through hole 14.

  As shown in FIGS. 1 to 3, the base portion 20 has a substantially flat plate shape that is perpendicular to the axis of the shaft-like portion 17. As shown in FIG. 5, the planar shape of the base part 20 is substantially square. The length of one side of the outer peripheral edge of the base portion 20 is set to a dimension that is sufficiently larger than the length of one side of the through hole 14. The base portion 20 is disposed below the lid plate 11 (inside the battery case C). The upper surface of the base portion 20 is a pressure receiving portion 21 that is parallel to the lid plate 11. The pressure receiving portion 21 is formed with a positioning step portion 22 (positioning portion described in claims) having a square shape (that is, similar to the rotation restricting portion 19) so as to surround the rotation restricting portion 19. Yes. An inner region surrounded by the positioning step portion 22 in the pressure receiving portion 21 is an upper pressure receiving surface 23, and a region outside the positioning step portion 22 in the pressure receiving portion 21 is higher than the upper pressure receiving surface 23. The lower pressure receiving surface 24 is low.

<Fixing nut 25>
As shown in FIGS. 1 and 3, a fixing nut 25 for fixing the electrode terminal 16 to the lid plate 11 is screwed into the male screw portion 18. The lower surface of the fixing nut 25 is a pressing portion 26. The pressing portion 26 is configured to sandwich an insulating spacer 31 (to be described later) with the lid plate 11. Further, the pressing portion 26 is configured to compress and deform the seal member 27 by being brought close to the pressure receiving portion 21 of the electrode terminal 16.

<Seal member 27>
As shown in FIGS. 1 and 3, the seal member 27 is formed on the seal surface 15 of the lid plate 11 to prevent the electrolyte solution 13 in the battery case C from leaking outside through the through hole 14. The electrode terminal 16 is disposed between the pressure receiving portion 21 and the electrode terminal 16. The seal member 27 is made of an insulating rubber material. As shown in FIG. 6, the planar shape of the outer peripheral edge of the seal member 27 is a square. A square center hole 28 is formed in the seal member 27 so as to penetrate in the vertical direction. Each side constituting the outer peripheral edge of the seal member 27 and each side constituting the inner peripheral edge of the center hole 28 are parallel to each other. In a state where the seal member 27 is not elastically deformed, the length dimension of one side of the center hole 28 is slightly smaller than the length of one side of the through hole 14.

  As shown in FIGS. 2 and 6, the lower surface 27 </ b> S (the surface facing the pressure receiving portion 21) of the seal member 27 has a notch 29 having a shape in which the hole edge of the center hole 28 is recessed in a square shape on the entire circumference. It is formed continuously over. The bottom surface shape of the cutout portion 29 (the shape viewed from below at right angles to the axis of the shaft-shaped portion 17) is a square like the center hole 28. Each side of the notch 29 is parallel to each side of the center hole 28. In a state where the seal member 27 is not elastically deformed, the length dimension of one side of the notch portion 29 is smaller than the length of one side of the positioning step portion 22.

  On the lower surface 27S of the seal member 27, a positioning projection 30 (a positioning portion according to the claims) in a form protruding downward along the outer peripheral edge of the seal member 27 is continuously formed over the entire circumference. Has been. As shown in FIG. 6, the bottom shape of the inner peripheral edge of the positioning protrusion 30 is a square as is the outer peripheral edge of the seal member 27. Each side of the inner peripheral edge of the positioning protrusion 30 is parallel to each side of the outer peripheral edge of the seal member 27. In a state where the seal member 27 is not elastically deformed, the length dimension of one side of the inner peripheral edge of the positioning step portion 22 is the same length as one side of the positioning step portion 22 of the electrode terminal 16.

<Insulating spacer 31>
The insulating spacer 31 is made of an insulating synthetic resin material. As shown in FIGS. 2 and 7, the insulating spacer 31 includes a main body portion 32 that has a flat plate shape perpendicular to the axis of the shaft-like portion 17, and a cylindrical portion 33 that protrudes downward from the lower surface of the central portion of the lower surface of the main body portion 32. It is formed integrally. The planar shape of the outer peripheral edge of the main body 32 is a true circle. At the center of the insulating spacer 31, a fitting hole 34 is formed so as to penetrate vertically from the upper surface of the main body portion 32 to the lower surface of the cylindrical portion 33 (parallel to the axis of the shaft-like portion 17). The lower end side region of the inner peripheral surface of the fitting hole 34 constitutes the inner peripheral surface of the cylindrical portion 33.

  The planar shape of the fitting hole 34 and the planar shape of the inner peripheral surface of the cylindrical portion 33 are square. The length of one side of the fitting hole 34 is set to be the same as or slightly larger than the one side of the rotation restricting portion 19. The bottom shape of the outer periphery of the cylindrical portion 33 is a square, like the fitting hole 34. Each side of the outer periphery of the cylindrical portion 33 is parallel to each side of the inner periphery of the fitting hole 34 and the cylindrical portion 33. The length dimension of one side of the outer peripheral surface of the cylindrical portion 33 is set to be the same as or slightly smaller than the length of one side of the through hole 14. The length dimension of one side of the outer peripheral surface of the cylindrical portion 33 is a dimension smaller than the length of one side of the center hole 28 in a state where the seal member 27 is not elastically deformed.

  The insulating spacer 31 has a main body 32 interposed between the upper surface (outer surface) of the lid plate 11 and the lower surface of the fixing nut 25, and the inner periphery of the through hole 14 and the center hole 28 and the outer periphery of the shaft-shaped portion 17. It is assembled to the lid plate 11 and the electrode terminal 16 with the cylindrical portion 33 interposed therebetween. As shown in FIG. 2, the projecting dimension P of the cylindrical part 33 from the lower surface of the main body part 32 is the plate thickness dimension Da of the lid plate 11 and the thickness of the seal member 27 in a state where the seal member 27 is not elastically deformed. The dimension is set to be smaller than the dimension combined with the dimension Db.

<Assembly process>
Next, the assembly process of each member in the lid plate 11 will be described. When assembling, first, the sealing member 27 is externally fitted to the shaft-like portion 17 from above, and the positioning projection 30 is fitted to the positioning step portion 22 while being aligned in the circumferential direction. Is placed in a state of contact with the pressure receiving portion 21. Thereby, the seal member 27 is positioned with respect to the electrode terminal 16 in the horizontal direction (a direction perpendicular to the axis of the shaft-like portion 17). In the state where the seal member 27 is positioned on the electrode terminal 16, as shown in FIG. 2, the lower surface of the positioning protrusion 30 is placed on the lower pressure receiving surface 24 in a state of contact with the surface, and positioning is performed on the lower surface 27 </ b> S of the seal member 27. A region inside the protrusion 30 and outside the notch 29 is placed on the upper pressure-receiving surface 23 in a surface-contact state. Further, the notch 29 of the seal member 27 faces the upper pressure receiving surface 23 directly at the hole edge of the center hole 28.

  The electrode terminal 16 to which the seal member 27 is assembled as described above is assembled to the lid plate 11 from below (see FIG. 2). At this time, the upper surface of the seal member 27 is brought into contact with the lower surface (seal surface 15) of the lid plate 11 with the shaft portion 17 penetrating the through hole 14 from below and the electrode terminal 16 supported from below. At this time, the seal member 27 is not elastically deformed. Further, the rotation restricting portion 19 and the through hole 14 are aligned by rotating the electrode terminal 16 in the circumferential direction.

  Thereafter, the insulating spacer 31 is assembled. At this time, the cylindrical portion 33 is fitted into the shaft-shaped portion 17 from above, and the fitting hole 34 is fitted to the rotation restricting portion 19 while the insulating spacer 31 is aligned in the circumferential direction, and the cylindrical portion 33 is Fit into the through hole 14. Since the fitting hole 34, the rotation restricting portion 19, the through-hole 14, and the cylindrical portion 33 are all non-circular (square) in plan shape, the electrode terminal 16, the sealing member 27, and the insulating spacer with respect to the lid plate 11 are used. 31 is positioned in a state in which relative rotation around the shaft-like portion 17 is restricted. Further, the electrode terminal 16 and the insulating spacer 31 are restricted from relative displacement in the front-rear direction and the left-right direction, and the seal member 27 and the insulating spacer 31 are also restricted from relative displacement in the front-rear direction and the left-right direction.

  In a state where the insulating spacer 31 is assembled to the lid plate 11, the main body portion 32 is placed on the upper surface of the lid plate 11 in a surface contact state. At this time, the lower end of the cylindrical portion 33 is located higher than the lower surface 27S of the seal member 27, and is in a state of floating from the upper pressure receiving surface 23. The height difference (vertical interval) between the lower end surface of the cylindrical portion 33 and the upper pressure receiving surface 23 (pressure receiving portion 21) becomes a crushing allowance for compressing and deforming the seal member 27 in the axial direction of the shaft-like portion 17. Further, an escape space 35 is formed between the outer periphery of the cylindrical portion 33 and the inner periphery of the center hole 28 of the seal member 27 by forming the notch portion 29. The escape space 35 extends over the entire region from the upper end to the lower end of the center hole 28 and is open to the lower surface of the seal member 27 and the lower surface of the cylindrical portion 33.

  After the insulating spacer 31 is temporarily assembled to the lid plate 11 and the electrode terminal 16 as described above, the fixing nut 25 is screwed into the male screw portion 18, and the pressing portion 26 is brought into contact with the upper surface of the main body portion 32 of the insulating spacer 31. Tighten in the state of letting. As the fixing nut 25 is tightened, the electrode terminal 16 is displaced relatively upward with respect to the lid plate 11, the pressure receiving portion 21 and the pressing portion 26 approach, and the pressure receiving portion 21 of the electrode terminal 16 and the lid plate are moved. The vertical distance from the eleven seal surfaces 15 decreases. As the interval is narrowed, the seal member 27 is compressed and deformed up and down. As shown in FIG. 3, the upper surface and the lower surface 27S of the seal member 27 are respectively connected to the seal surface 15 and the pressure receiving portion 21 (upper pressure receiving surface 23). And the lower pressure-receiving surface 24) elastically adheres.

  When the lower end surface of the cylindrical portion 33 comes into contact with the upper pressure receiving surface 23, the fastening of the fixing nut 25 is completed. As described above, the electrode terminal 16, the seal member 27, and the insulating spacer 31 are fixed to the lid plate 11, and the sealing performance by the seal member 27 is exhibited. After the electrode terminal 16, the seal member 27, and the insulating spacer 31 are assembled and fixed to the lid plate 11, as shown in FIG. 1, a bus bar 36 for connecting the sealed battery B and an external conductive path (not shown). Is fitted on the shaft-like portion 17 of the electrode terminal 16 and placed on the upper surface of the fixing nut 25, and is connected to the electrode terminal 16 so as to be conductive by tightening the connection nut 37.

<Effect of Example 1>
The battery case C of this embodiment includes a lid plate 11, a through hole 14 formed in the lid plate 11 and penetrating the electrode terminal 16, a ring-shaped seal member 27 that is in close contact with the inner surface of the lid plate 11, and a lid And a ring-shaped insulating spacer 31 that contacts the outer surface of the plate 11. The electrode terminal 16 is formed with a pressure receiving portion 21 that sandwiches the seal member 27 with the lid plate 11. The fixing nut 25 for fixing the electrode terminal 16 to the lid plate 11 is formed with a pressing portion 26 arranged so as to sandwich the insulating spacer 31 between the lid plate 11 and the pressing portion 26 is a pressure receiving portion 21. The seal member 27 is compressed and deformed by approaching to. The insulating spacer 31 is formed with a cylindrical portion 33 that is accommodated in the center hole 28 and the through hole 14 of the seal member 27 and contacts the pressure receiving portion 21.

  In the battery case C of the present embodiment, the seal member 27 is compressed and deformed as the pressing portion 26 and the pressure receiving portion 21 are brought close to each other. Therefore, the compression rate of the seal member 27 is the distance between the pressure receiving portion 21 and the pressing portion 26. It is prescribed by. When the cylindrical portion 33 is stretched between the pressure receiving portion 21 and the pressing portion 26, the approaching operation of the pressure receiving portion 21 and the pressing portion 26 (that is, the tightening operation of the fixing nut 25) is restricted, and the pressure receiving portion 21 and the pressing portion. The interval of 26 is minimized. Since the minimum distance between the pressure receiving portion 21 and the pressing portion 26 is fixed depending on the dimensions of the cylindrical portion 33, the compression rate of the seal member 27 is stabilized, and the reliability of the sealing performance by the seal member 27 is improved.

  Further, the battery case C of the present embodiment is arranged so that the seal member 27 is in close contact with the pressure receiving portion 21, and the cylinder portion 33 is arranged so as to contact the pressure receiving portion 21, and the electrode terminal 16 and the seal member 27 are arranged. Are locked together to form a positioning portion (positioning step portion 22 and positioning protrusion 30) that restricts relative displacement in the radial direction (horizontal direction) intersecting the penetrating direction of the through hole 14, and the cylindrical portion. 33 is externally fitted to the electrode terminal 16 in a state in which the relative displacement in the radial direction (horizontal direction) intersecting the penetration direction of the through hole 14 is restricted. According to this configuration, with the seal member 27 attached to the electrode terminal 16 and the electrode terminal 16 inserted through the through hole 14, the cylindrical portion 33 is interposed between the center hole 28 of the seal member 27 and the outer periphery of the electrode terminal 16. When assembled, there is no possibility that the cylindrical portion 33 interferes with the hole edge portion of the center hole 28 of the seal member 27.

  Further, since the sealing member 27 is compressed up and down until the fixing nut 25 is tightened and the lower end surface of the cylindrical portion 33 contacts the upper pressure receiving surface 23, the inner peripheral surface of the center hole 28 bulges inward. It will be. At this time, if the bulged portion is caught between the lower end surface of the cylindrical portion 33 and the upper pressure receiving surface 23, the compression rate of the seal member 27 becomes lower than the prescribed compression rate. When the compression rate of the sealing member 27 is lowered, there is a concern that the sealing performance is deteriorated. Therefore, in the present embodiment, the electrode terminal 16 and the seal member 27 are positioned in the radial direction, and the cylindrical portion 33 is positioned with respect to the electrode terminal 16, and further, in a state before the seal member 27 is compressed and deformed. An escape space 35 is formed between the inner periphery of the center hole 28 of the seal member 27 and the outer periphery of the cylindrical portion 33. According to this configuration, even if the hole edge portion of the center hole 28 bulges toward the inner peripheral side in the process of compressing and deforming the seal member 27, the bulge portion remains inside the escape space 35. There is no possibility of being sandwiched between 33 and the pressure receiving portion 21.

  Further, in the battery case C of this embodiment, the pressing portion 26 is formed on the fixing nut 25 separate from the electrode terminal 16, and the inner periphery of the through hole 14 and the outer periphery of the tube portion 33 are relatively rotated. It is formed in a square (that is, non-circular) that can be fitted in a restricted state, and the inner periphery of the cylindrical portion 33 and the outer periphery of the electrode terminal 16 are also formed in a square (non-circular) that can be fitted in a relative rotation restricted state. Yes. According to this configuration, when the fixing nut 25 is screwed into the male screw portion 18 of the electrode terminal 16, the electrode terminal 16 does not rotate, so that the fixing nut 25 can be securely tightened.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the electrode terminal and the seal member are engaged with each other to form the positioning portion that restricts the relative displacement in the radial direction intersecting the through direction of the through hole. The member may be in a form that does not form such a positioning portion.
(2) In the above embodiment, the cylindrical portion is externally fitted to the electrode terminal in a state where relative displacement in the radial direction intersecting the through direction of the through hole is restricted. The terminal may be externally fitted in a state in which the terminal can be relatively displaced in the radial direction.
(3) In the above-described embodiment, the escape space is provided between the inner periphery of the center hole of the seal member and the outer periphery of the tube portion before the seal member is compressed and deformed. It does not have to be provided.
(4) In the above embodiment, the sealing member is brought into intimate contact with the inner surface of the lid plate and the insulating spacer is brought into contact with the outer surface of the lid plate. However, the sealing member is brought into intimate contact with the outer surface of the lid plate, You may contact | abut to an inner surface.
(5) In the above embodiment, the positioning portion (positioning step portion) of the electrode terminal is formed on the upper surface of the pressure receiving portion (the surface facing the lid plate), but the positioning portion of the electrode terminal is formed on the outer peripheral edge of the pressure receiving portion. May be.
(6) In the above embodiment, the sealing member is sandwiched between the pressure receiving portion of the electrode terminal and the lid plate, and the insulating spacer is sandwiched between the pressing portion of the fixing nut and the lid plate. The sealing member may be sandwiched between the pressing portion of the fixing nut and the lid plate.
(7) In the above-described embodiment, the pressing portion is formed on a fixed nut that is separate from the electrode terminal. However, the pressing portion is integrated with the electrode terminal and is brought close to the pressure receiving portion by caulking. It may be.

B ... Sealed battery C ... Battery case 11 ... Lid plate 12 ... Electrode group 13 ... Electrolyte solution 14 ... Through hole 16 ... Electrode terminal 18 ... Male screw part 21 ... Pressure receiving part 22 ... Positioning protrusion (positioning part)
25 ... Fixing nut 26 ... Pressing part 27 ... Sealing member 28 ... Center hole 30 ... Positioning step part (positioning part)
31 ... Insulating spacer 33 ... Cylinder part 35 ... Relief space

Claims (4)

The electrode group and the electrolytic solution are accommodated to constitute a sealed battery,
A lid plate;
A through hole formed in the lid plate and penetrating the electrode terminal;
A ring-shaped seal member that is in close contact with one of the inner surface and the outer surface of the lid plate;
A ring-shaped insulating spacer that abuts against the other of the inner and outer surfaces of the lid plate;
A pressure receiving portion that is formed on the electrode terminal and sandwiches one of the sealing member and the insulating spacer with the lid plate;
A pressing portion that is arranged so as to sandwich the other of the sealing member and the insulating spacer between the lid plate and compresses and deforms the sealing member by approaching the pressure receiving portion;
The insulating spacer is formed so as to be accommodated in the center hole and the through hole of the seal member, and includes a pressure receiving portion and a cylindrical portion that contacts the side of the pressing portion that contacts the seal member. A battery case characterized by the above. The seal member is arranged so as to be in close contact with the pressure receiving portion,
The cylindrical portion is arranged so as to contact the pressure receiving portion,
By positioning the electrode terminal and the seal member to each other, a positioning part that regulates relative displacement in the radial direction intersecting the penetration direction of the through hole is formed,
The said cylinder part is made into the form fitted on the said electrode terminal in the state by which the relative displacement to the radial direction which cross | intersects the penetration direction of the said through-hole was controlled. Battery case.   The escape space is provided between the inner periphery of the center hole of the seal member and the outer periphery of the cylindrical portion in a state before the seal member is compressed and deformed. Battery case. The pressing portion is separate from the electrode terminal, and is formed on a fixing nut that is screwed into the male screw portion of the electrode terminal,
The inner periphery of the through hole and the outer periphery of the cylindrical portion are formed in a non-circular shape that can be fitted in a relative rotation restricted state,
The inner periphery of the said cylinder part and the outer periphery of the said electrode terminal are formed in the non-circle which can be fitted in a relative rotation control state, The one of Claim 1 thru | or 3 characterized by the above-mentioned. Battery case.

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