JP2017045657A - Current cutoff device and power storage device employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disclose a technology for facilitating management of a fastening force in fixing an electrification plate and a holder, while simplifying a structure.SOLUTION: A current cutoff device 10 of a power storage device 100 comprises an electrification plate 20, a first deformable plate 30, a holder 80 and a fastening member 84. On the electrification plate 20, a first through-hole 21a is formed which penetrates from one surface at a side of the holder to the other surface at an opposite side of the holder. In the holder 80, at a position corresponding to the first through-hole 21a, a second through-hole 80a is formed which penetrates from one surface at a side of the electrification plate to the other surface at an opposite side of the electrification plate. The fastening member 84 includes: an insulative bolt 90 which is disposed within the first through-hole and the second through-hole and of which the head is disposed at one of the electrification plate side and the holder side; and an insulative nut 91 which is disposed at the other of the electrification plate side and the holder side and threaded to the bolt 90.SELECTED DRAWING: Figure 2

Description

  The technology disclosed in this specification relates to a current interrupt device and a power storage device using the current interrupt device.

  The power storage device disclosed in Patent Document 1 includes a current interrupt device that interrupts the energization path when the pressure in the case increases. The current interrupting device includes a current collector that is electrically connected to a power generation element in a case, a pressure-sensitive member that electrically connects the current collector and the electrode terminal, and a holder that supports the current collector. Have. When the pressure in the case increases, the pressure-sensitive member is deformed and disconnected from the current collector, and the electrical connection between the electrode terminal and the power generation element is interrupted. In this power storage device, a plurality of through holes are formed in the outer peripheral portion of the current collector. The holder has a plurality of bosses corresponding to the positions of the plurality of through holes of the current collector. When fixing the current collector to the holder, first, the plurality of bosses of the holder are inserted into the through holes of the current collector, and then the tip of the boss penetrating the current collector is subjected to a heat caulking process. As a result, the current collector is fixed to the holder.

JP 2013-225500 A

  In the power storage device of Patent Document 1, since the current collector is fixed to the holder by thermal caulking processing, a member for fixing the current collector to the holder becomes unnecessary, and the configuration can be simplified. However, in the power storage device of Patent Document 1, it is difficult to manage the fastening force between the current collector and the holder to a desired value because the current collector is fixed to the holder by heat caulking the tip of the boss. It is also difficult to readjust the fastening force when looseness occurs between the two. The present specification discloses a current interrupting device that facilitates management of a fastening force when fixing a holder and a current collector while having a simple structure, and a power storage device using the current interrupting device.

  The power storage device disclosed in this specification is housed in a case, and is electrically disconnected from a conductive state in which an electrode assembly housed in the case and an electrode terminal provided in the case are electrically connected. Switch to non-conducting state. The current interrupting device is disposed between the energizing plate electrically connected to the electrode assembly, the first deforming plate electrically connected to the electrode terminal, the energizing plate and the case, and supports the energizing plate. And a fastening member for fixing the energizing plate and the holder. The first deforming plate is in contact with and electrically connected to the current-carrying plate in the conductive state, while being separated from the current-carrying plate and electrically disconnected from the current-carrying plate in the non-conductive state. The energization plate is formed with a first through hole penetrating from one surface on the holder side to the other surface on the opposite side of the holder. The holder has a second through hole penetrating from one surface on the energizing plate side to the other surface on the opposite side of the energizing plate at a position corresponding to the first through hole. The fastening member is disposed in the first through hole and the second through hole, and is disposed on the other of the energizing plate side and the holder side with an insulating bolt having a head disposed on one of the energizing plate side and the holder side. And an insulating nut screwed onto the bolt.

  In said electrical storage apparatus, the electricity supply board and the holder are being fixed by the fastening member (bolt and nut) inserted in the 1st through-hole and 2nd through-hole which were formed in each. For this reason, compared with the fixing by the conventional heat caulking process, the fastening force at the time of fixing an electricity supply board and a holder can be managed by managing the fastening torque of a volt | bolt and a nut. Even if loosening occurs between the energizing plate and the holder, the fastening force can be readjusted by tightening the bolts and nuts.

  Moreover, this specification discloses an electrical storage apparatus provided with said electric current interruption apparatus.

1 is a cross-sectional view of a power storage device according to a first embodiment. The enlarged view of the broken-line part 200a of FIG. The principal part enlarged view of the electrical storage apparatus of Example 2 (equivalent to the broken line part 200a of FIG. 1). The principal part enlarged view of the electrical storage apparatus of Example 3 (equivalent to the broken line part 200a of FIG. 1). The principal part enlarged view of the electrical storage apparatus of the modification 1 (equivalent to the broken line part 400a of FIG. 4). The figure which shows the example which deform | transformed the electrical storage apparatus of Example 1 (equivalent to the broken-line part 200a of FIG. 1).

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Characteristic 1) In the current interrupt device disclosed in the present specification, the head of the bolt is in contact with the surface of the energizing plate opposite to the holder, and the nut is the surface of the holder opposite to the energizing plate. You may contact | abut.

(Feature 2) In the current interrupting device disclosed in the present specification, a recess having a shape following the shape of the nut is formed around the second through hole on the surface opposite to the energizing plate of the holder, The nut may be accommodated in the recess. According to such a configuration, since the nut is held by the recess, it is easy to screw the bolt onto the nut.

(Characteristic 3) In the current interrupting device disclosed in the present specification, the energization plate has a first through hole penetrating from one surface on the holder side to the other surface on the opposite side of the holder. An insertion hole may be formed at a position corresponding to the first through hole on the surface on the current-carrying plate side. A female screw groove may be formed on the inner peripheral surface of the insertion hole, and a male screw groove corresponding to the female screw groove may be formed on the outer peripheral surface of the bolt. Then, the bolt is disposed in the first through hole of the energization plate in a state of being screwed into the female thread groove, and the head of the bolt is disposed on the side opposite to the holder of the energization plate. The plate and the holder may be fixed.

(Characteristic 4) In the current interrupting device disclosed in the present specification, at least a part of the head of the bolt may protrude to the outer peripheral side from the outer peripheral end of the energizing plate. According to such a structure, the deformation | transformation and damage by an electricity supply plate contacting other members are suppressed by the head part (specifically, the part which protruded to the outer peripheral side rather than the outer periphery end of the electricity supply plate). Can do.

(Characteristic 5) The current interrupting device disclosed in the present specification is disposed on the opposite side of the energization plate from the first deformation plate, and is provided with a protrusion that projects toward the center of the energization plate. The second deformation plate may be further provided. The second deformable plate includes a first state in which the protrusion is positioned at the first position and the energizing plate and the first deformable plate are in contact with each other when the electrode assembly and the electrode terminal are in conduction. In a state where the terminal and the terminal are non-conductive, the projection may be switched from the first position to the second position on the current-carrying plate side to be switched to the second state in which the current-carrying plate and the first deformation plate are separated.

(Characteristic 6) The positional relationship in the direction in which the first deformation plate and the second deformation plate are stacked is such that the position of the head of the bolt is more distant from the current plate of the second deformation plate in the first state. You may leave | separate from an electricity supply board. According to such a configuration, since the head of the bolt protrudes from the second deformation plate in the stacking direction, deformation and damage due to the second deformation plate coming into contact with another member can be suppressed.

  Hereinafter, the power storage device 100 according to the first embodiment will be described. As shown in FIG. 1, the power storage device 100 includes a case 1, an electrode assembly 3 accommodated in the case 1, and terminals 5 and 7 as electrode terminals fixed to the case 1. The electrode assembly 3 and the terminals 5 and 7 are electrically connected. The power storage device 100 also includes a current interrupt device 10 disposed between the electrode assembly 3 and the terminal 7. An electrolyte is injected into the case 1, and the electrode assembly 3 is immersed in the electrolyte.

  The case 1 is made of metal and is a substantially rectangular parallelepiped box-shaped member. The case 1 includes a main body 111 and a lid portion 112 fixed to the main body 111. The lid part 112 covers the upper part of the main body 111. Openings 81 and 82 are formed in the lid portion 112 of the case 1. The terminal 5 communicates with the inside and outside of the case 1 through the opening 81, and the terminal 7 communicates with the inside and outside of the case 1 through the opening 82.

  The electrode assembly 3 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The electrode assembly 3 is configured by laminating a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a plurality of separators. The positive electrode sheet and the negative electrode sheet include a current collecting member and an active material layer formed on the current collecting member. As the current collecting member, one used for the positive electrode sheet is, for example, an aluminum foil, and one used for the negative electrode sheet is, for example, a copper foil. The electrode assembly 3 includes a positive current collecting tab 41 and a negative current collecting tab 42. The positive electrode current collecting tab 41 is formed on the upper end portion of the positive electrode sheet. The negative electrode current collecting tab 42 is formed on the upper end portion of the negative electrode sheet. The positive electrode current collecting tab 41 and the negative electrode current collecting tab 42 protrude above the electrode assembly 3. The positive electrode current collecting tab 41 is fixed to the positive electrode lead 43. The negative electrode current collecting tab 42 is fixed to the negative electrode lead 44.

  The positive electrode lead 43 is connected to the positive electrode current collecting tab 41 and the terminal 5. The positive electrode current collecting tab 41 and the terminal 5 are electrically connected via the positive electrode lead 43. An insulating member 72 is disposed between the positive electrode lead 43 and the case 1. The insulating member 72 insulates the positive electrode lead 43 from the lid portion 112 of the case 1.

  The negative electrode lead 44 is connected to the negative electrode current collecting tab 42 and the connection terminal 46. The connection terminal 46 is electrically connected to the terminal 7 via the current interrupt device 10. Therefore, the negative electrode current collecting tab 42 and the terminal 7 are electrically connected via the negative electrode lead 44, the connection terminal 46, and the current interrupt device 10. Thereby, an energization path for connecting the electrode assembly 3 and the terminal 7 is formed. The current interrupt device 10 can interrupt this energization path. The configuration of the current interrupt device 10 will be described later. An insulating member 73 is disposed between the negative electrode lead 44 and the case 1. The insulating member 73 insulates the negative electrode lead 44 from the case 1.

  Resin gaskets 62 and 63 are disposed on the upper surface of the lid portion 112. An external terminal 60 is disposed on the upper surface of the gasket 62. A through hole 60 a is formed in the external terminal 60. The through hole 60 a is larger in size on the lower surface side than the upper surface side of the external terminal 60. The gasket 62 insulates the lid portion 112 from the external terminal 60. The bolt 64 passes through the through hole 60a. Specifically, the head of the bolt 64 is accommodated in the through hole 60a. Further, the shaft portion of the bolt 64 protrudes above the external terminal 60 through the through hole 60a. The terminal 5, the external terminal 60, and the bolt 64 are electrically connected to each other and constitute a positive terminal. The configuration of the gasket 63, the external terminal 61, and the bolt 65 is the same as the configuration of the gasket 62, the external terminal 60, and the bolt 64 described above. The terminal 7, the external terminal 61, and the bolt 65 are electrically connected to each other and constitute a negative terminal.

  Here, the terminal 7 will be described with reference to FIG. As shown in FIG. 2, the terminal 7 is caulked and fixed to the case 1. The terminal 7 includes a cylindrical portion 94, a base portion 95, and a fixing portion 96. The cylindrical portion 94 is inserted into the opening 82. A through hole 97 is formed in the cylindrical portion 94. The base portion 95 is formed in an annular shape. The base portion 95 is fixed to the lower end portion of the cylindrical portion 94. The base portion 95 is disposed inside the case 1. A recess 98 is formed in the base portion 95. The recess 98 communicates with the through hole 97, and the inside of the recess 98 is maintained at atmospheric pressure. The fixed portion 96 is formed in an annular shape and is disposed at the upper end portion of the cylindrical portion 94. The fixing part 96 is disposed outside the case 1. The terminal 7 is fixed to the lid portion 112 of the case 1 by a fixing portion 96.

  Next, with reference to FIG. 2, the member arrange | positioned between the terminal 7 and the cover part 112 of case 1 is demonstrated. An annular insulating seal member 86 is disposed between the terminal 7 and the lid portion 112. The seal member 86 makes a round around the cylindrical portion 94. The seal member 86 is made of a fluorine resin such as perfluoroalkoxyalkane (PFA). The seal member 86 is in contact with the lid portion 112, the base portion 95, and the cylindrical portion 94 in the seal portion S1 indicated by a thick line in FIG. Thereby, the seal member 86 seals between the lid portion 112 and the base portion 95 and between the lid portion 112 and the cylindrical portion 94. A thin portion 86 a having a small thickness in the vertical direction is formed at an end portion between the lower surface of the lid portion 112 and the upper surface of the base portion 95 of the seal member 86. The thin portion 86a has an upper surface in contact with the lid portion 112, and a lower surface in contact with a holder 80 described later. Since the seal member 86 is formed of an insulating material, the insulation between the terminal 7 and the lid portion 112 is maintained. The material of the sealing member 86 is not limited to the above, and any material having sealing properties, insulating properties, and electrolytic solution resistance may be used.

  Next, the current interrupt device 10 will be described. As shown in FIG. 2, the current interrupt device 10 includes an energization plate 20, a first deformation plate 30, a holder 80, and a fastening member 84. The first deformation plate 30 is a circular conductive diaphragm, and protrudes downward. The first deformation plate 30 has a central portion 32 and an outer peripheral portion 31. A central portion 32 of the first deformation plate 30 is connected to the energization plate 20. The outer peripheral portion 31 of the first deformation plate 30 is connected to the outer peripheral portion of the lower surface of the base portion 95. When the first deformation plate 30 is connected to the lower surface of the base portion 95, the outer peripheral surface of the first deformation plate 30 comes into contact with the inner wall surface of the holder 80. Thereby, the connection position with respect to the base part 95 (namely, terminal 7) of the 1st deformation board 30 can be stabilized. The lower end of the recess 98 of the base portion 95 is covered with the first deformation plate 30. Since the inside of the recess 98 is maintained at atmospheric pressure, atmospheric pressure acts on the upper surface of the first deformation plate 30. The energization plate 20 is a metal member and has electrical conductivity. The energization plate 20 is formed in a circular shape in plan view, and is disposed below the first deformation plate 30. A connection terminal 46 is connected to the energization plate 20. The energizing plate 20 has a central portion 22 and an outer peripheral portion 21. A groove portion 20 a is formed on the lower surface of the energization plate 20. The groove portion 20a is formed around the central portion 22, and the energizing plate 20 and the central portion 32 of the first deformation plate 30 are connected inside the groove portion 20a. The mechanical strength of the energizing plate 20 at the position where the groove 20a is formed is lower than the mechanical strength of the energizing plate 20 at a position other than the groove 20a.

  The holder 80 is formed in an annular shape, and accommodates and holds the base portion 95 of the terminal 7, the first deformation plate 30, and the seal member 75 therein. The energization plate 20 is fixed to the lower end of the holder 80, and the energization plate 20 is supported by the holder 80. The holder 80 is made of an insulating material having elasticity. For the holder 80, for example, polyphenyl sulfide (PPS) is used. The material of the holder 80 is not limited to the above-described PPS, and may be any material (for example, polypropylene (PP) or the like) that has insulating properties and electrolytic solution resistance and higher compressive strength than the seal member 86.

  The holder 80 has an upper end portion 79 and a central portion 78. The upper end portion 79 is disposed between the lower surface of the lid portion 112 of the case 1 and the upper surface of the base portion 95 of the terminal 7. A thin portion 79 a having a small vertical thickness is formed at the end of the upper end 79. The thin portion 79a and the thin portion 86a of the seal member 86 described above overlap each other by a predetermined length in the radial direction in plan view. On the outer peripheral side of the thin portion 79a of the upper end portion 79, a thick portion 79b having a large vertical thickness is formed. The thick portion 79 b has an upper surface in contact with the lower surface of the lid portion 112, and a lower surface in contact with the upper surface of the base portion 95.

  The central portion 78 extends downward from the outer peripheral edge of the upper end portion 79. The central portion 78 accommodates the base portion 95 and the first deformation plate 30 therein. A concave portion 77 is formed in an annular shape on the lower surface of the central portion 78 (the surface on the current-carrying plate 20 side). The shape of the longitudinal section of the recess 77 is formed in a rectangular shape. The lower end of the recess 77 is closed by the energizing plate 20. That is, the holder 80 is in contact with the current-carrying plate 20 on both the inside and the outside of the recess 77. However, the holder 80 and the current-carrying plate 20 are merely in contact with each other, and both are not sealed at the contact portion.

  A seal member 75 is disposed between the upper surface of the energization plate 20 and the lower surface of the recess 77. The seal member 75 seals between the energizing plate 20 and the holder 80. That is, the seal member 75 is accommodated in the recess 77 in a state compressed in the vertical direction, and seals between the upper surface of the energizing plate 20 and the lower surface of the holder 80 (the bottom surface of the recess 77). The seal member 75 is disposed in the recess 77 and goes around the first deformation plate 30. The seal member 75 is an O-ring made of ethylene-propylene rubber (EPM) such as ethylene propylene diene rubber (EPDM). The sealing member 75 is not limited to the above, and a material having sealing properties, insulating properties, electrolytic solution resistance, and elasticity may be used.

  A plurality of first through holes 21 a are formed in the outer peripheral portion 21 of the energization plate 20. The first through hole 21 a extends from the upper surface to the lower surface of the energization plate 20 and penetrates the energization plate 20. The first through hole 21a is formed at a position on the outer peripheral side from the seal member 75 when viewed in plan. The plurality of first through holes 21 a are arranged along the outer peripheral portion 21 of the energizing plate 20 at regular intervals (for example, four locations at 90 ° intervals) with a gap in the circumferential direction. The shape of the cross section of the first through hole 21a is circular, and the diameter of the cross section is constant. In addition, the holder 80 (central portion 78) has a second through hole 80a that penetrates from one surface on the energizing plate side to the other surface on the opposite side of the energizing plate 20 at a position corresponding to the first through hole 21a. Is formed. The shape of the cross section of the second through hole 80a is the same as that of the first through hole 21a, and the diameter of the cross section is equal to that of the first through hole 21a.

  The fastening member 84 includes an insulating bolt 90 and an insulating nut 91. The energizing plate 20 and the holder 80 are fastened by bolts 90 and nuts 91. That is, the bolt 90 is inserted into each of the first through hole 21a and the second through hole 80a from the lower surface side (the first through hole 21a side) of the energizing plate 20. The bolt 90 has a head portion 90a and a shaft portion 90b. The shaft portion 90b is formed in a shape corresponding to the first through hole 21a and the second through hole 80a. The axial length of the shaft portion 90b is longer than the combined length of the first through hole 21a and the second through hole 80a in the axial direction, and the diameter of the shaft portion 90b is the first through hole 21a and the second through hole 21a. The diameter is slightly smaller than the diameter of the through hole 80a. A male thread groove is formed on the outer peripheral surface of the shaft portion 90b. The shaft portion 90 b is inserted to the upper surface side (second through-hole 80 a side) of the holder 80, and an insulating nut 91 is screwed into the shaft portion 90 b on the upper surface of the central portion 78 of the holder 80. The energization plate 20 is fixed to the holder 80 by screwing the nut 91 into the bolt 90. A recess 80b having a shape following the shape of the nut 91 is formed around the second through hole 80a on the surface of the holder 80 opposite to the current-carrying plate 20. The diameter of the recess 80 b is slightly larger than the diameter of the nut 91, and the depth of the recess 80 b (the length of the recess 80 b in the axial direction of the second through hole 80 a) is slightly larger than the height of the nut 91. Has been. For this reason, the nut 91 is accommodated in the recess 80b in a state of being screwed with the bolt 90. The diameter of the head 90a of the bolt 90 and the diameter of the nut 91 are both larger than the diameters of the first through hole 21a and the second through hole 80a. For this reason, the head 90a of the bolt 90 contacts the lower surface of the energizing plate 20, and the nut 91 contacts the surface of the holder 80 opposite to the energizing plate 20, whereby the energizing plate 20 and the holder 80 are clamped. ing. As is clear from the above description, in this embodiment, the distance from the head 90a of the bolt 90 to the nut 91 is constant. Specifically, the distance from the head 90 a of the bolt 90 to the nut 91 is a length obtained by adding the thickness of the current-carrying plate 20 and the thickness of the holder 80. For this reason, the lower surface of the holder 80 is in contact with the upper surface of the energizing plate 20, the head 90 a of the bolt 90 is in contact with the lower surface of the energizing plate 20, and the nut 91 is on the opposite side of the energizing plate 20 of the holder 80. When the nut 91 is fastened to the bolt 90 so as to contact the surface, the compression allowance (crush allowance) of the seal member 75 becomes constant. As a result, the fastening force for fixing the energization plate 20 and the holder 80 becomes constant, and the fastening force can be easily managed.

  As is clear from the above description, the current interrupt device 10 has an energization path that connects the connection terminal 46, the energization plate 20, the first deformation plate 30, and the terminal 7 in series. For this reason, the electrode assembly 3 and the terminal 7 are electrically connected via the energization path of the current interrupt device 10.

  Here, the interruption | blocking operation | movement of the electric current interruption apparatus 10 is demonstrated. In the power storage device 100 described above, the terminal 5 and the terminal 7 are used in a conductive state in which current can be passed through an external device (for example, a generator or a motor). When the pressure in the case 1 increases due to overcharging of the power storage device 100 or the like, the pressure that acts on the lower surface of the energization plate 20 increases. On the other hand, atmospheric pressure acts on the upper surface of the first deformation plate 30. For this reason, when the internal pressure of the case 1 rises and reaches a predetermined value, the energizing plate 20 connected to the central portion 32 of the first deformable plate 30 breaks starting from the mechanically fragile groove 20a. Then, the first deformation plate 30 is inverted and changes to a convex state upward. As a result, the energization path connecting the energization plate 20 and the first deformation plate 30 is interrupted, and the electrode assembly 3 and the terminal 7 are brought out of electrical conduction. At this time, the first deformation plate 30 is insulated from the connection terminal 46, and the energization plate 20 is insulated from the terminal 7.

  The effect of the electrical storage apparatus 100 of Example 1 is demonstrated. In the power storage device 100, the energizing plate 20 and the holder 80 are fixed by insulating bolts 90 and nuts 91. Therefore, compared with the case where the current-carrying plate and the holder are fixed by heat caulking as in the prior art, management of the fastening force is facilitated. That is, by allowing the head 90 a of the bolt 90 to abut against the energization plate 20 and the nut 91 to abut against the holder 80, the compression allowance (crushing allowance) of the seal member 75 can be managed. Management of the fastening force with the holder 80 becomes easy. Further, since the compression allowance (crushing allowance) of the seal member 75 is constant, the gap between the current-carrying plate 20 and the holder 80 can be suitably sealed. In addition, since the energizing plate 20 and the holder 80 are fixed by the bolt 90 and the nut 91, even if the fastening of both is loosened, the energizing plate 20 and the holder 80 are re-fastened by retightening the bolt 90. can do.

  Further, unlike the conventional power storage device, since heat is not required when assembling the energization plate 20 and the holder 80, the characteristic change of the current interrupt device 10 (for example, a reduction in operating accuracy) and the seal member 75 Deterioration and damage can be prevented.

  Next, a power storage device of Example 2 will be described with reference to FIG. Hereinafter, only differences from the first embodiment will be described, and detailed description of the same configurations as those of the first embodiment will be omitted. The same applies to other embodiments.

  As shown in FIG. 3, an insertion hole 88 a is formed in a position corresponding to the first through hole 21 a of the energization plate 20 on the lower surface (surface on the energization plate 20 side) of the holder 88. The total length of the insertion hole 88a in the axial direction and the thickness of the current-carrying plate is slightly longer than the length of a shaft portion 92b of a bolt 92 described later. A female screw groove is formed in the inner peripheral surface of the insertion hole 88a. The diameter of the cross section of the insertion hole 88a (the diameter of the valley of the female thread groove) is made equal to that of the first through hole 21a.

  Insulating bolts 92 are inserted into the insertion holes 88a of the holder 88 from the surface opposite to the holder 88 through the first through hole 21a. The bolt 92 has a head portion 92a and a shaft portion 92b. A male thread groove corresponding to the female thread groove of the insertion hole 88a is formed on the outer peripheral surface of the shaft portion 92b of the bolt 92. The diameter of the head portion 92a of the bolt 92 is larger than the diameter of the first through hole 21a, and the bolt 92 is screwed while the female screw groove of the insertion hole 88a and the screw groove of the shaft portion 92b of the bolt 92 are screwed together. By bringing the head portion 92 a into contact with the lower surface of the energizing plate 20, the energizing plate 20 and the holder 88 are fixed.

  In the power storage device according to the second embodiment, the insertion plate 88a formed in the holder 88 and having a thread groove and the male thread groove formed in the shaft portion 92b of the bolt 92 are screwed together, whereby the energization plate 20 and the holder 88 are Is fixed. For this reason, when assembling the energization plate 20 and the holder 88, a member for fixing the bolt 92 becomes unnecessary, and the configuration can be simplified. Also, in the power storage device of the second embodiment, since the current-carrying plate 20 and the holder 88 are fixed by the insulating bolt 92, the same operational effects as those of the power storage device 100 of the first embodiment can be achieved. That is, also in the power storage device of the second embodiment, the bolts 92 are inserted into the holder 88 until the lower surface of the holder 88 contacts the upper surface of the energizing plate 20 and the head 92a of the bolt 92 contacts the lower surface of the energizing plate 20. By screwing into the hole 88a, the compression allowance (crush allowance) of the seal member 75 becomes constant. As a result, the fastening force for fixing the energization plate 20 and the holder 88 becomes constant, and the fastening force can be easily managed. Further, since the compression allowance (crushing allowance) of the seal member 75 is constant, the gap between the current-carrying plate 20 and the holder 88 can be suitably sealed. Furthermore, even if a slack (gap) is generated between the energizing plate 20 and the holder 88, the bolt 92 can be tightened to eliminate the slack (gap).

  Next, a power storage device of Example 3 will be described with reference to FIG. In the power storage device of the present embodiment, the configuration of the current interrupt device is different from that of the first embodiment, and other configurations are the same as those of the first embodiment.

  As shown in FIG. 4, the current interrupt device 10 a includes an energization plate 20, a first deformation plate 30, and a metal second deformation plate 40.

  The second deformation plate 40 has a central portion 47 and an outer peripheral portion 48. The second deformation plate 40 is disposed below the energization plate 20, and a central portion 47 projects downward. The upper surface of the outer peripheral part 48 of the 2nd deformation board 40 and the lower surface of the outer peripheral part 21 of the electricity supply board 20 are being fixed by welding. A projecting portion 40 a that projects upward is provided at the center of the upper surface of the second deformable plate 40. A central portion 22 of the energizing plate 20 is located above the protruding portion 40a. The pressure in the case 1 acts on the lower surface of the second deformation plate 40.

  The energization plate 20 is disposed between the second deformation plate 40 and the first deformation plate 30, and the energization plate 20 is formed with a vent hole 20 b. A space 120 between the second deformable plate 40 and the energizing plate 20 communicates with a space 122 between the first deformable plate 30 and the energized plate 20 through the vent hole 20b. The first deformation plate 30 is disposed above the energization plate 20. A space 124 is formed on the upper surface of the first deformation plate 30, and the space 124 is maintained at atmospheric pressure.

  The current interrupt device 10a has an energization path that connects the connection terminal 46, the energization plate 20, the first deformation plate 30, and the terminal 7 in series. For this reason, the electrode assembly 3 and the terminal 7 are electrically connected through the energization path of the current interrupt device 10a.

  Here, the interruption | blocking operation | movement of the electric current interruption apparatus 10a is demonstrated. In the power storage device described above, when the internal pressure of the case 1 increases, the pressure acting on the lower surface of the second deformation plate 40 increases. On the other hand, the pressure of the space 120 sealed from the space in the case 1 acts on the upper surface of the second deformation plate 40. For this reason, if the pressure in case 1 exceeds a predetermined value, the 2nd deformation board 40 will reverse and it will change from a convex state of the lower part to a convex state of the upper part. At this time, the air in the space 120 moves to the space 122 through the vent hole 20b, and the pressure in the space 122 increases. Further, when the second deformable plate 40 changes from the downwardly convex state to the upwardly convex state, the protruding portion 40a of the second deformable plate 40 moves from the first position to the second position, and the central portion of the energizing plate 20 22 and the current-carrying plate 20 is broken at the groove 20a. Thereby, the 1st deformation board 30 reverses and the center part 22 of the 1st deformation board 30 and the electricity supply board 20 displaces upwards. For this reason, the electricity supply path which connects the electricity supply plate 20 and the 1st deformation plate 30 is interrupted | blocked, and it will be in the non-conduction state by which the conduction | electrical_connection between the electrode assembly 3 and the terminal 7 is interrupted | blocked. At this time, the first deformation plate 30 is insulated from the connection terminal 46, and the energization plate 20 is insulated from the terminal 7. Also in the power storage device of the third embodiment, since the current-carrying plate 20 and the holder 80 are fixed by the bolts 90 and the nuts 91, the same operational effects as the power storage device 100 of the first embodiment can be achieved. In addition, said electric current interruption apparatus 10a may be attached to the electrical storage apparatus of Example 2. FIG.

(Modification 1) Next, Modification 1 will be described with reference to FIG. Hereinafter, only differences from the third embodiment will be described, and detailed description of the same configurations as those of the third embodiment will be omitted.

  In the power storage device of Modification 1, in the first state (the state shown in FIG. 5) in which the protruding portion 40a of the second deformation plate 40 is located at the first position, the stacking direction of the first deformation plate 30 and the second deformation plate 40 The position of the lower end of the head portion 90a of the bolt 90 in the axial direction of the shaft portion 90b of the bolt 90 is the lower end of the second deformable plate 40 (the position farthest from the energizing plate 20 of the second deformable plate 40 (center portion). It is located at a position farther from the energizing plate 20 than position 47).

  In the power storage device of Modification 1, the head 90 a of the bolt 90 is located below the lower end of the second deformation plate 40. For this reason, the 2nd deformation board 40 is protected by the head 90a of the volt | bolt 90, and can suppress the deformation | transformation and damage by an external factor (contact with another member etc.).

  As mentioned above, although the Example of the technique which this specification discloses was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  For example, as illustrated in FIG. 6, in the power storage device 100 according to the first embodiment, at least a part of the head 90 a of the bolt 90 may protrude outward from the outer peripheral end of the energization plate 20. By configuring in this way, the current-carrying plate 20 is protected by the head 90a of the bolt 90 (specifically, the portion protruding to the outer peripheral side from the outer peripheral end of the current-carrying plate 20), and external factors (other members) Deformation and damage due to contact with the like. In addition, the same structure may be provided also in another Example and modification.

  Moreover, in Example 1, the structure which the position of the volt | bolt 90 and the nut 91 interchanged may be sufficient. In other words, the head 90 a of the bolt 90 abuts against the surface of the holder 80 opposite to the energizing plate 20, and the nut 91 abuts against the surface of the energizing plate to sandwich the energizing plate 20 and the holder 80. Also good.

  Further, the current interrupt device 10 may be provided on the terminal 5 side, or may be provided on both the terminal 5 and the terminal 7. When the current interrupt device 10 is provided on the terminal 5 side, an insulating member can be disposed between the terminal 5 and the lid portion 112 in the same manner as the configuration of the above-described embodiment. Further, in the above embodiment, the first deformation plate 30 is reversed, so that the conduction with the energization plate 20 is interrupted. However, the deformation mode of the first deformation plate 30 is not limited to inversion. For example, when the central portion 32 of the first deformable plate 30 is bent upward, the energizing plate 20 is broken starting from the groove portion 20a, and the conduction between the first deformable plate 30 and the energizing plate 20 is interrupted. Also good. The first deformable plate 30 may be deformed in any way as long as conduction between the first deformable plate 30 and the energizing plate 20 is interrupted. The same applies to the second deformation plate 40.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

1: Case 3: Electrode assembly 5, 7: Terminal 10: Current interrupting device 20: Current supply plate 21: Outer peripheral portion 21a: First through hole 22: Central portion 30: First deformation plate 40: Second deformation plate 40a: Projection 41: Positive electrode current collecting tab 42: Negative electrode current collecting tab 43: Positive electrode lead 44: Negative electrode lead 46: Connection terminal 75: Sealing member 77: Recessed portion 78: Center portion 79: Upper end portion 79a: Thin portion 79b: Thick portion 80: Holder 80a: Second through hole 80b: Recess 84: Fastening member 86: Seal member 86a: Thin portion 90: Bolt 90a: Head portion 90b: Shaft portion 91: Nut 100: Power storage device 111: Main body 112: Lid portion

Claims (8)

Current interruption accommodated in the case and switched between a conductive state in which the electrode assembly accommodated in the case and the electrode terminal provided in the case are electrically connected and a non-conductive state in which the electrode assembly is electrically disconnected A device,
An energization plate electrically connected to the electrode assembly;
A first deformation plate electrically connected to the electrode terminal;
An insulating holder disposed between the energization plate and the case and supporting the energization plate;
A fastening member for fixing the energization plate and the holder;
The first deforming plate is in contact with and electrically connected to the energizing plate in the conductive state, while being separated from the energizing plate and electrically non-conductive with the energizing plate in the non-conductive state. Connected,
A first through hole penetrating from one surface on the holder side to the other surface on the side opposite to the holder is formed in the energization plate,
In the holder, a second through hole penetrating from one surface on the energizing plate side to the other surface on the opposite side of the energizing plate is formed at a position corresponding to the first through hole,
The fastening member is disposed in the first through hole and the second through hole, an insulating bolt having a head disposed on one of the energizing plate side and the holder side, the energizing plate side, and the A current interrupting device comprising: an insulating nut disposed on the other side of the holder and screwed into the bolt. The bolt head is in contact with the surface of the energizing plate opposite to the holder,
The current interrupt device according to claim 1, wherein the nut is in contact with a surface of the holder opposite to the energizing plate. Around the second through hole on the surface of the holder opposite to the current-carrying plate, a recess having a shape following the shape of the nut is formed.
The current interrupt device according to claim 2, wherein the nut is accommodated in the recess. Current interruption accommodated in the case and switched between a conductive state in which the electrode assembly accommodated in the case and the electrode terminal provided in the case are electrically connected and a non-conductive state in which the electrode assembly is electrically disconnected A device,
An energization plate electrically connected to the electrode assembly;
A first deformation plate electrically connected to the electrode terminal;
An insulating holder disposed between the energization plate and the case and supporting the energization plate;
A bolt for fixing the energizing plate and the holder;
The first deforming plate is in contact with and electrically connected to the energizing plate in the conductive state, while being separated from the energizing plate and electrically non-conductive with the energizing plate in the non-conductive state. Connected,
A first through hole penetrating from one surface on the holder side to the other surface on the side opposite to the holder is formed in the energization plate,
An insertion hole is formed at a position corresponding to the first through hole on the surface on the current-carrying plate side of the holder,
A female screw groove is formed on the inner peripheral surface of the insertion hole,
A male thread groove corresponding to the female thread groove is formed on the outer peripheral surface of the bolt,
The bolt is disposed in the first through hole of the energization plate in a state of being screwed into the female thread groove, and the head of the bolt is disposed on the opposite side of the energization plate from the holder. The electric current interruption apparatus with which the said electricity supply board and the said holder are being fixed by this.   The current interrupting device according to any one of claims 1 to 4, wherein at least a part of a head portion of the bolt protrudes toward an outer peripheral side with respect to an outer peripheral end of the energization plate. A second deformation plate that is disposed on the opposite side to the first deformation plate with respect to the current supply plate, and is provided with a protrusion protruding toward the center of the current supply plate;
In the second deformable plate, in a state where the electrode assembly and the electrode terminal are electrically connected, the first protrusion is located at the first position, and the energizing plate and the first deformable plate are in contact with each other. In a state where the electrode assembly and the electrode terminal are non-conductive, the protrusion moves from the first position to the second position on the current-carrying plate side to separate the current-carrying plate and the first deformation plate. The current interrupting device according to any one of claims 2 to 5, wherein the current interrupting device is switched to a second state.   The positional relationship in the direction in which the first deformable plate and the second deformable plate are stacked is such that the position of the head of the bolt is the farthest position from the energizing plate of the second deformable plate in the first state. The current interrupting device according to claim 6, wherein the current interrupting device is further away from the energizing plate.   An electrical storage apparatus provided with the electric current interruption apparatus as described in any one of Claims 1-7.

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