JP2016189316A - Power storage device module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device module that can protect a current cutoff part.SOLUTION: A secondary battery module 100 which includes a plurality of secondary batteries 10, a bus bar 110 for electrically connecting the plurality of secondary batteries 10, and a bolt 120 for connecting the bus bar 110 and the secondary batteries 10 includes an O ring 121b for sealing a portion between a bolt head portion 121 and the bus bar 110 in the bolt 120, and an O ring 72b for sealing a portion between the bus bar 110 and a first portion 16c of a negative electrode terminal portion 16.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power storage device module.

  Conventionally, secondary batteries such as lithium ion secondary batteries have been installed in vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) as power storage devices for storing electric power used in electrical components. Yes. The secondary battery includes a case, an electrode assembly housed in the case, and two terminals that protrude outside the case and have different polarities.

  For example, Patent Document 1 includes a current interrupting unit that interrupts a current in response to a rise in pressure inside the case between the energization paths that electrically connect the terminal and the electrode assembly. It is disclosed. In the sealed battery disclosed in Patent Document 1, a through hole that is connected to a space on the side corresponding to the battery outside of the current interrupting portion is formed inside the terminal. This through hole is firmly sealed by a terminal plug. For this reason, it is suppressed that a foreign material penetrate | invades into a through-hole, and the electric current interruption part is protected.

JP 2010-212034 A

  By the way, for the purpose of facilitating handling, a power storage device module having a plurality of secondary batteries may be configured. In the power storage device module, the plurality of secondary batteries are electrically connected by a bus bar. The bus bar is connected to the terminals by connecting members such as bolts and nuts. And in such a power storage device module, it is expected that foreign matter can be prevented from entering the through hole by a mechanism different from that disclosed in Patent Document 1, thereby protecting the current interrupting portion. Yes.

  The present invention has been made paying attention to such problems existing in the prior art, and an object thereof is to provide a power storage device module capable of protecting a current interrupting unit.

  A power storage device module that solves the above problem is a power storage device module including a power storage unit, wherein the power storage unit includes a plurality of power storage devices, and the plurality of power storage devices are accommodated in a case and the case. The electrode assembly, the first terminal portion electrically connected to the electrode assembly, and the second terminal electrically connected to the electrode assembly are different in polarity from the first terminal portion. A first portion that protrudes to the outside of the case, a second portion that protrudes to the inside of the case, the first portion, and the second portion. Each of the through-holes that are open and disposed inside the case, and when the pressure inside the case reaches a predetermined pressure, electrically connects the electrode assembly and the first part. Current interrupter that interrupts the current in the current path The power storage unit includes a bus bar that electrically connects the plurality of power storage devices, and a connection member that connects the first portion and the bus bar, and the connection The member covers the opening of the through hole in the first part, and has a sandwiching part that sandwiches the bus bar between itself and the first part. The gist is provided with a first sealing member that seals between the sandwiching portion and the bus bar, and a second sealing member that seals between the bus bar and the first portion.

  According to this, the gap between the sandwiching portion that covers the opening of the through hole in the first portion and the bus bar is sealed by the first sealing member, and the gap between the bus bar and the first portion is the second seal. Sealed by a stop member. Therefore, intrusion of foreign matter into the through hole is suppressed at the connecting portion between the bus bar and the first portion using the connecting member, and thus the current interrupting portion can be protected.

  Regarding the power storage device module, the first sealing member and the second sealing member are annular members arranged so as to surround the axis of the through hole when viewed from the axial direction of the through hole. It is preferable that

According to this, invasion of foreign matter into the through hole is further suppressed at the connecting portion between the bus bar and the first portion using the connecting member, and the current interrupting portion can be more reliably protected.
About the said electrical storage apparatus module, it is preferable that the said electrical storage apparatus is a secondary battery. According to this, a current interrupting part can be protected as a power storage device module including a plurality of secondary batteries.

  According to the present invention, the current interrupting part can be protected.

The perspective view which shows a secondary battery module typically. The perspective view which shows typically the secondary battery fractured | ruptured partially. The perspective view which shows typically the secondary battery disassembled partially. 4-4 sectional view shown in FIG. Sectional drawing of the secondary battery in another embodiment.

Hereinafter, the secondary battery module of this embodiment will be described.
As shown in FIG. 1, a secondary battery module 100 as a power storage device module includes a power storage unit 130 to which secondary batteries 10 as a plurality of power storage devices are electrically connected. The power storage unit 130 connects the secondary battery 10 as a plurality of power storage devices, the plurality of bus bars 110 that electrically connect the plurality of secondary batteries 10 to each other, and the bus bar 110 and the secondary battery 10. And a plurality of bolts 120 as connecting members. The secondary battery module 100 includes a restraining mechanism that restrains a plurality of secondary batteries 10 by applying a load from a predetermined direction, a connection terminal portion for electrically connecting the secondary battery module 100 and the outside, and the like. May be provided.

  As shown in FIGS. 2 and 3, the secondary battery 10 of this embodiment is a square lithium ion secondary battery. The secondary battery 10 includes a flat square box-shaped case 11. The case 11 includes a rectangular box-shaped case main body 12 having an opening 12 a and a flat lid 13 that closes the opening 12 a of the case main body 12. The case body 12 and the lid 13 are made of metal (for example, aluminum). The case body 12 and the lid 13 are welded. The lid 13 has two through holes 13b penetrating in the thickness direction.

  The secondary battery 10 includes an electrolyte solution (not shown) accommodated in the case 11. The secondary battery 10 includes a negative electrode terminal portion 16 as a first terminal portion and a positive electrode terminal portion 15 as a second terminal portion having a polarity different from that of the negative electrode terminal portion 16. The positive terminal portion 15 and the negative terminal portion 16 are fixed to a lid 13 that is one of the walls of the case 11. Further, the positive electrode terminal portion 15 and the negative electrode terminal portion 16 are partially protruded inside the case 11 and partially protruded outside the case 11. The positive terminal portion 15 and the negative terminal portion 16 will be described in detail later.

  The secondary battery 10 includes a rectangular parallelepiped electrode assembly 14 accommodated in a case 11. The electrode assembly 14 has a structure in which the positive electrodes 21 and the negative electrodes 22 are alternately stacked with the separators 23 interposed therebetween, so that they are layered. The positive electrode 21 and the negative electrode 22 are insulated by a separator 23. In the following description, the direction in which the positive electrode 21 and the negative electrode 22 are stacked is simply referred to as a stacking direction D1.

  The positive electrode 21 has a rectangular positive metal foil (for example, aluminum foil) and a positive electrode active material layer on both surfaces of the positive metal foil. The positive electrode 21 has a positive electrode tab 31 protruding from the end of the positive electrode 21. The negative electrode 22 has a rectangular negative metal foil (for example, copper foil) and negative electrode active material layers on both sides of the negative metal foil. The negative electrode 22 has a negative electrode tab 32 protruding from the end of the negative electrode 22.

  The electrode assembly 14 includes a positive electrode tab group 31a and a negative electrode tab group 32a. The positive electrode tab group 31 a and the negative electrode tab group 32 a protrude from the end surface 14 a facing the lid 13. In the positive electrode tab group 31a, a plurality of positive electrode tabs 31 are stacked in layers. Similarly, in the negative electrode tab group 32a, a plurality of negative electrode tabs 32 are layered.

  As shown in FIGS. 3 and 4, the positive electrode terminal portion 15 includes a positive electrode conductive member 40. The positive electrode conductive member 40 is composed of a single metal plate (in this embodiment, an aluminum plate). The positive electrode conductive member 40 is located between the lid 13 and the electrode assembly 14.

  The positive electrode conductive member 40 includes a first joint 41 disposed relatively closer to the lid 13, a second joint 42 disposed closer to the electrode assembly 14 than the first joint 41, and a first A curved third joint 43 that connects the joint 41 and the second joint 42. In the first joint portion 41, a positive electrode tab group 31 a is welded to a surface (lower surface) facing the end surface 14 a of the electrode assembly 14. Thereby, the 1st junction part 41 and the positive electrode tab group 31a are electrically connected.

  The positive electrode terminal portion 15 includes a prismatic positive electrode head portion 51 and a positive electrode shaft portion 52 protruding from the seating surface 51 a of the positive electrode head portion 51. The positive electrode shaft portion 52 has a thread groove on the outer peripheral surface. The positive electrode shaft portion 52 protrudes outside the case 11 through the through hole 13 b of the lid 13. In this embodiment, the positive electrode head portion 51 and the positive electrode shaft portion 52 constitute a pole column portion 15 a partially protruding from the case 11. The pole portion 15a has a screw hole 15b extending along the axis.

  The positive terminal portion 15 has an insulating O-ring 53 inserted through the positive electrode shaft portion 52. Further, the positive terminal portion 15 has an insulating flanged ring 54 inserted through the positive electrode shaft portion 52. The flanged ring 54 is a cylindrical member fitted into the through hole 13b.

  The positive electrode terminal portion 15 has a nut 55 that is screwed onto the positive electrode shaft portion 52 from above the flanged ring 54. The positive electrode terminal portion 15 and the lid 13 are unitized by a nut 55 screwed onto the positive electrode shaft portion 52. The flanged ring 54 is interposed between the positive electrode shaft portion 52 and the peripheral edge portion of the through hole 13 b of the lid 13, and between the nut 55 and the lid 13.

  The positive electrode head 51 is disposed inside the case 11. A second joint portion 42 of the positive electrode conductive member 40 is welded to the surface of the positive electrode head portion 51 on the electrode assembly 14 side. Thereby, the positive terminal portion 15 is electrically connected to the electrode assembly 14. Then, the pole portion 15a and the positive electrode conductive member 40 are electrically connected, and the positive electrode conductive member 40 is electrically connected to the positive electrode tab group 31a, whereby the electrode assembly 14 and the bus bar 110 are connected. An energization path between the connecting portions is configured.

  The positive terminal portion 15 includes an insulating first positive electrode insulating member 57 that covers a part of the positive electrode head portion 51, and an insulating second positive electrode insulating member 58 that is interposed between the positive electrode conductive member 40 and the electrode assembly 14. And have. The first positive electrode insulating member 57 regulates contact between the lid 13 and the positive electrode head 51. The first positive electrode insulating member 57 is attached to the positive electrode head portion 51 from the lid 13 side. The first positive electrode insulating member 57 covers the seating surface 51 a of the positive electrode head portion 51 and a part of the outer peripheral surface. The second positive electrode insulating member 58 regulates contact between the positive electrode conductive member 40 and the electrode assembly 14.

  The negative electrode terminal portion 16 has a negative electrode conductive member 60 as a conductive member. The negative electrode conductive member 60 is composed of a single metal plate (a copper plate in the present embodiment). The negative electrode conductive member 60 is located between the lid 13 of the case 11 and the electrode assembly 14.

  The negative electrode conductive member 60 includes a first joint 61 disposed relatively closer to the lid 13, a second joint 62 disposed closer to the electrode assembly 14 than the first joint 61, and a first A curved third joining portion 63 that connects the joining portion 61 and the second joining portion 62; In the 1st junction part 61, the negative electrode tab group 32a is welded to the surface (lower surface) facing the end surface 14a of the electrode assembly 14, whereby the first junction part 61 and the negative electrode tab group 32a are electrically connected. It is connected.

  The negative electrode terminal portion 16 has a prismatic negative electrode head portion 71 and a negative electrode shaft portion 72 protruding from the seating surface 71 a of the negative electrode head portion 71. The negative electrode shaft portion 72 has a thread groove on the outer peripheral surface. The negative electrode shaft portion 72 protrudes outside the case 11 through the through hole 13 b of the lid 13. In this embodiment, the negative electrode head portion 71 and the negative electrode shaft portion 72 constitute a pole column portion 16 a partially protruding outside the case 11.

  The negative electrode terminal portion 16 includes an insulating O-ring 73 inserted through the negative electrode shaft portion 72 and an insulating flanged ring 74. The flanged ring 74 is a cylindrical member fitted into the through hole 13b. The negative terminal portion 16 has a nut 75 screwed onto the negative electrode shaft portion 72 from above the flanged ring 74. The negative electrode terminal portion 16 and the lid 13 are unitized by a nut 75 screwed onto the negative electrode shaft portion 72. The flanged ring 74 is interposed between the negative electrode shaft portion 72 and the peripheral edge portion of the through hole 13 b of the lid 13 and between the nut 75 and the lid 13.

  As shown in FIG. 4, the negative electrode head 71 is disposed inside the case 11. A surface 71 b of the negative electrode head 71 on the electrode assembly 14 side has a terminal recess 71 c that is recessed in a mortar shape from the electrode assembly 14 toward the lid 13. The pole portion 16a has a through hole 16b. The through hole 16b penetrates the pole column portion 16a in the axial direction. The terminal recess 71c communicates with the outside of the case 11 through the through hole 16b. The pole part 16a has a thread groove as a first thread part on the inner peripheral surface of the through hole 16b.

  The negative electrode shaft portion 72 has an annular concave portion 72a and an O-ring 72b as a second sealing member fitted in the concave portion 72a on the tip surface of the portion protruding to the outside of the case 11. The O-ring 72b is an annular member that surrounds the axial center of the through hole 16b when viewed from the axial direction of the through hole 16b, that is, the axial center direction of the polar column portion 16a. The O-ring 72b is made of a material having rubber elasticity (for example, silicon rubber). The O-ring has a circular cross section when cut along a plane including the center line.

  Moreover, the negative electrode terminal part 16 is arrange | positioned inside the case 11, and will electrically connect the electrode assembly 14 and the connection part of the bus-bar 110, if the pressure inside the case 11 reaches a predetermined pressure. A current interrupting unit 80 serving as a current interrupting unit that interrupts the current in the current-carrying path. The current interrupting part 80 is located between the pole column part 16 a of the negative electrode terminal part 16 and the negative electrode conductive member 60. In this embodiment, the pole column portion 16a is electrically connected to the negative electrode conductive member 60 via the current interrupting portion 80, and the negative electrode conductive member 60 is electrically connected to the negative electrode tab group 32a, whereby the electrode An energization path between the assembly 14 and a connection portion between the bus bar 110 is formed.

  When the current interrupting unit 80 is activated by the gas generated inside the case 11, the current interrupting unit 80 interrupts the electrical connection between the pole column 16 a of the negative electrode terminal 16 and the negative electrode conductive member 60. That is, the current interrupting unit 80 constitutes a part of the energization path when not operating, and interrupts the energization path when operated under the pressure of the gas generated in the case 11. The current interrupting part 80 is provided integrally with the second joining part 62 of the negative electrode conductive member 60. In this embodiment, the current interruption part 80 is integrated with the negative electrode terminal part 16 which is an electrode terminal part of one polarity.

  The current interrupting part 80 has a contact plate 81 joined to the second joining part 62 and the negative electrode head 71. The contact plate 81 is made of a conductive material, has a disk shape, and covers the terminal recess 71c from the electrode assembly 14 side. The outer peripheral portion of the contact plate 81 that protrudes from the terminal concave portion 71c and the peripheral edge portion of the terminal concave portion 71c in the negative electrode head portion 71 are fixed by spot welding.

  A portion of the contact plate 81 facing the terminal recess 71c is convex toward the electrode assembly 14 (downward) in a normal state, and the protruding end of the convex portion and the second joint portion 62 are welded. Conductivity for conducting the negative electrode welded portion P (the portion indicated by dot hatching in FIG. 4) that is a welded portion of the contact plate 81 and the second joint portion 62 between the polar column portion 16 a of the negative electrode terminal portion 16 and the negative electrode conductive member 60. Part. Therefore, the negative electrode conductive member 60 and the pole column portion 16 a of the negative electrode terminal portion 16 are electrically connected via the contact plate 81.

  The current interrupting unit 80 has an insulating ring 82. The insulating ring 82 is disposed between the outer peripheral portion of the contact plate 81 and the second joint portion 62. The insulating ring 82 causes the negative electrode head portion 71 and the second joint portion 62 to be spaced apart from each other. Further, a seal member 83 is disposed outside the insulating ring 82 and between the negative electrode head 71 and the second joint 62.

  The 2nd junction part 62 has the interruption | blocking recessed part 60c in the surface at the side of the electrode assembly 14. FIG. The blocking recess 60 c is recessed in a mortar shape from the electrode assembly 14 toward the lid 13. The negative electrode weld portion P is located on the bottom surface of the blocking recess 60c. The 2nd junction part 62 has the fracture | rupture groove | channel 84 in the site | part used as the bottom face of the interruption | blocking recessed part 60c. The fracture groove 84 has an annular shape surrounding the negative electrode weld portion P. In addition, the second joint portion 62 includes a thin portion 84 a corresponding to the fracture groove 84. The thin portion 84 a is a portion where the thickness is made thinner than the portion other than the thin portion 84 a in the second joint portion 62 by forming the fracture groove 84 in the second joint portion 62. Therefore, the thin-walled portion 84 a is the same as the fracture groove 84 and has an annular shape provided around the negative electrode welded portion P.

  The current interrupting unit 80 includes a deforming plate 85 that receives and deforms the pressure inside the case 11. The deformation plate 85 is a diaphragm made of an elastic material, for example, a metal plate, and is disposed at a position closer to the electrode assembly 14 than the second joint portion 62. The deformation plate 85 has a disk shape and covers the blocking recess 60c from the electrode assembly 14 side. The outer peripheral portion of the deformable plate 85 and the second joint portion 62 are fixed by welding over the entire outer periphery of the deformable plate 85. The deformation plate 85 seals the inside of the case 11 from the outside of the case 11.

  The deformation plate 85 protrudes from the lid 13 side toward the electrode assembly 14 side (downward) in the normal state, and protrudes toward the lid 13 at a portion facing the negative electrode welded portion P in the convex portion. A protrusion 85a. The protrusion 85 a is made of an insulating material and faces the negative electrode welded portion P surrounded by the fracture groove 84. The deformation plate 85 is configured to be deformed by pressure and project toward the lid 13 when a pressure larger than the set pressure is applied from the electrode assembly 14 side toward the lid 13 side.

  The current interrupting unit 80 includes a protection member 86 installed at a position closer to the electrode assembly 14 than the deformation plate 85. The protection member 86 is disposed between the deformation plate 85 and the electrode assembly 14. The protective member 86 prevents the deformation plate 85 from being deformed before the set pressure is reached due to an impact applied to the deformation plate 85. The protection member 86 has a disk shape, and a support recess 86 a that is recessed along the deformation plate 85 that is convex toward the electrode assembly 14 exists on the upper surface of the protection member 86. There is a gas hole 86b penetrating in the vertical direction on the bottom surface of the support recess 86a.

  In the secondary battery 10, the pressure outside the case 11 (substantially atmospheric pressure) acts on one surface (the surface on the lid 13 side) of the deformable plate 85 via the through hole 16 b. Further, the pressure inside the case 11 acts on the other surface of the deformation plate 85 (the surface on the electrode assembly 14 side) via the gas hole 86b.

  The negative electrode terminal portion 16 includes an insulating negative electrode insulating member 87 that covers the seating surface 71a and the outer peripheral surface of the negative electrode head portion 71, the negative electrode head portion 71, the contact plate 81, the insulating ring 82, the seal member 83, and the negative electrode conductive member. The crimping member 88 which unitizes the member 60 (2nd junction part 62), the deformation | transformation board 85, and the protection member 86 is provided.

  In the secondary battery 10 of this embodiment, the positive terminal portion 15 and the negative terminal portion 16 are fixed to the lid 13. For this reason, in the positive electrode terminal portion 15, a part of the pole column portion 15 a and the nut 55 become a portion 15 c that protrudes outside the case 11. A portion 15 c of the positive terminal portion 15 that protrudes outside the case 11 is a connection portion with the bus bar 110. On the other hand, in the positive electrode terminal portion 15, the other portions of the pole column portion 15 a and the entire positive electrode conductive member 40 become a portion 15 d that protrudes into the case 11.

  Further, in the negative electrode terminal portion 16, a part of the pole column portion 16 a and the nut 75 serve as a first portion 16 c that protrudes outside the case 11. Of the negative electrode terminal portion 16, the first portion 16 c protruding to the outside of the case 11 is a connection portion with the bus bar 110. On the other hand, in the negative electrode terminal portion 16, the other portions of the pole column portion 16 a, the current interrupting portion 80, and the negative electrode conductive member 60 serve as a second portion 16 d that protrudes into the case 11. And the through-hole 16b is each opened to the 1st site | part 16c and the 2nd site | part 16d in the negative electrode terminal part 16. FIG. Further, the current interrupting portion 80 is adjacent to the through hole 16b immediately below the opening of the through hole 16b in the second portion 16d.

  As shown in FIGS. 1 and 4, in the power storage unit 130, a plurality of secondary batteries 10 are arranged in parallel. In the power storage unit 130, the juxtaposed direction D2 of the plurality of secondary batteries 10 and the stacking direction D1 of each of the plurality of secondary batteries 10 are matched. In the secondary battery module 100, each of the plurality of secondary batteries 10 is arranged such that its own positive electrode terminal portion 15 is adjacent to the negative electrode terminal portion 16 of another adjacent secondary battery 10.

  The plurality of bolts 120 are made of metal. The bolt 120 includes a bolt head 121 having a polygonal (for example, hexagonal) plate shape, and a bolt shaft portion 122 extending from the bolt head 121. The bolt shaft portion 122 has a thread groove as a second threaded portion on the outer peripheral surface thereof.

  The bolt head 121 has an annular recess 121a and an O-ring 121b as a first sealing member fitted in the recess 121a on the surface on the lid 13 side. The O-ring 121 b is an annular member that surrounds the bolt shaft portion 122 when viewed from the axial center direction of the bolt shaft portion 122.

  The plurality of bus bars 110 are rectangular metal plates (for example, aluminum plates) that extend along the parallel direction D2. Each of the plurality of bus bars 110 includes a first connection portion 115 connected to the positive electrode terminal portion 15 and a second connection portion 116 connected to the negative electrode terminal portion 16. The first connecting part 115 has a first insertion hole 115a through which the bolt shaft part 122 is inserted. The second connecting portion 116 has a second insertion hole 116a through which the bolt shaft portion 122 is inserted.

  The bolt shaft portion 122 of the bolt 120 is screwed into the screw hole 15 b of the positive electrode terminal portion 15 in a state where the bolt shaft portion 122 is inserted into the first insertion hole 115 a of the first connecting portion 115. In this state, the first connecting portion 115 of the bus bar 110 is sandwiched between the bolt head 121 of the bolt 120 and the front end surface of the portion of the positive electrode shaft portion 52 that protrudes outside the case 11. Thereby, the bus bar 110 and the positive electrode terminal part 15 are mutually connected and are electrically connected.

  Further, the bolt shaft portion 122 of the bolt 120 is screwed into the thread groove of the through hole 16 b in the negative electrode terminal portion 16 with the bolt shaft portion 122 inserted into the second insertion hole 116 a of the second connecting portion 116. Has been. In this state, the bolt head 121 of the bolt 120 covers the opening of the through hole 16b in the first portion 16c. The second connecting portion 116 of the bus bar 110 is sandwiched between the bolt head 121 of the bolt 120 and the distal end surface of the portion of the negative electrode shaft portion 72 that protrudes outside the case 11. Thereby, the bus bar 110 and the negative electrode terminal part 16 are mutually connected and electrically connected. That is, the bolt head 121 of the bolt 120 sandwiches the second connecting portion 116 of the bus bar 110 between itself and the tip surface of the portion of the negative electrode shaft portion 72 that protrudes outside the case 11. It becomes a clamping part.

  And between the bolt head 121 and the 2nd connection part 116 of the bus-bar 110 is sealed with the O-ring 121b. The O-ring 121b seals the periphery of the bolt shaft portion 122 and the second insertion hole 116a over the entire circumference.

  The second connecting portion 116 of the bus bar 110 and the tip end surface of the negative electrode shaft portion 72 that protrudes outside the case 11 are sealed by an O-ring 72b. The O-ring 72b seals the periphery of the bolt shaft portion 122 and the through hole 16b over the entire circumference. That is, the O-ring 72b and the O-ring 121b are annular members that are disposed so as to surround the axis of the through hole 16b when viewed from the axial direction of the through hole 16b.

Next, the operation of the secondary battery module 100 will be described.
As shown in FIG. 4, the space between the bolt head 121 and the bus bar 110 covering the opening of the through hole 16b in the first portion 16c is sealed with an O-ring 121b, and the bus bar 110 and the first portion 16c are sealed. Is sealed by an O-ring 72b. Therefore, intrusion of foreign matter into the through-hole 16b is suppressed at a connection portion between the bus bar 110 using the bolt 120 and the first portion 16c.

  In particular, the O-ring 121b seals the periphery of the bolt shaft portion 122 and the second insertion hole 116a over the entire circumference. The O-ring 72b seals the periphery of the bolt shaft portion 122 and the through hole 16b over the entire circumference. Therefore, intrusion of foreign matter into the through hole 16b is further suppressed at the connection portion between the negative electrode terminal portion 16 and the bus bar 110. If foreign matter enters the through-hole 16b and adheres to the current interrupting portion 80, the operation of the current interrupting portion 80 may be affected, for example, the deformation of the contact plate 81 may be hindered.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) O-rings 72b and 121b prevent foreign matter from entering the through-hole 16b at the connection portion between the bus bar 110 using the bolt 120 and the first portion 16c. Therefore, the current interrupting unit 80 can be protected.

  (2) The O-rings 72b and 121b are annular members arranged so as to surround the axis of the through hole 16b when viewed from the axis direction of the through hole 16b. Therefore, intrusion of foreign matter into the through-hole 16b is further suppressed at the connecting portion between the bus bar 110 using the bolt 120 and the first portion 16c.

In addition, you may change this embodiment as follows.
As shown in FIG. 5, the bus bar 110 and the negative terminal portion 16 may be connected by a mechanism different from that of the above embodiment. More specifically, the bolt 120 has a cylindrical bolt shaft portion 123 extending from the bolt head 121. The bolt shaft portion 123 has a thread groove on the inner peripheral surface. The bolt shaft portion 123 serving as the clamping portion has an annular recess 123a and an O-ring 123b as a first sealing member fitted in the recess 123a on the front end surface on the lid 13 side. On the other hand, the nut 75 has an annular recess 75a and an O-ring 75b as a second sealing member fitted in the recess 75a on the surface on the bolt 120 side. Even if it is such a structure, the penetration | invasion to the through-hole 16b of a foreign material is suppressed.

The bus bar 110 and the negative terminal portion 16 may be connected by fitting or rivets.
○ Instead of some or all of the O-rings 72b, 75b, 121b, and 123b, packing having a square cross-sectional shape may be provided. When the packing is provided, the concave portion for accommodating the O-ring can be omitted. Further, a gasket may be provided in place of some or all of the O-rings 72b, 75b, 121b, and 123b.

O The recessed part for accommodating O-rings 72b, 75b, 121b, 123b may be provided in the bus bar 110.
In the negative electrode terminal portion 16, the through hole 16b may be curved or bent in a crank shape.

  The configuration may be interchanged between the positive terminal portion 15 and the negative terminal portion 16. That is, the positive terminal portion 15 may have a current interrupting portion 80. In this case, the first connection portion 115 of the bus bar 110 is connected to the negative electrode terminal portion 16, while the second connection portion 116 is connected to the positive electrode terminal portion 15.

  In addition, the specific configuration of the current interrupting unit 80 may be changed. For example, the fracture groove 84 may not be annular, but may be a recess provided on the outside of the negative electrode welded portion P with a gap. Alternatively, the deformation plate 85 may be eliminated, and the gas generated in the case 11 may be received by the negative electrode welded portion P and directly broken.

  The specific configuration of the electrode assembly 14 may be changed. For example, the shapes of the positive electrode 21, the negative electrode 22, and the separator 23 may be changed. For example, a square in front view may be used. Furthermore, the electrode assembly 14 may be a wound electrode assembly in which a strip-shaped positive electrode and a strip-shaped negative electrode are wound with a separator interposed therebetween.

  O You may attach the insulation cover which covers the 1st junction part 61 of the negative electrode conductive member 60, and the 1st junction part 41 of the positive electrode conductive member 40. FIG. The insulating cover is located inside the case 11 and between the upper surfaces of the first joint portion 61 and the first joint portion 41 and the back surface of the lid 13.

The embodiment can be applied to a power storage device other than the secondary battery such as a capacitor.
The secondary battery 10 is not limited to being mounted on a vehicle, but may be a stationary battery used in a house or the like.
The technical idea shown below can be grasped from the above embodiment and other examples.

(A) The first sealing member and the second sealing member are annular sealing members, and are preferably made of a material having rubber elasticity.
(B) The first sealing member and the second sealing member preferably have a circular cross-sectional shape when cut along a plane including a center line.

(C) It is preferable that at least one of the sandwiching portion and the bus bar has a recess that accommodates the first sealing member.
(D) It is preferable that at least one of the bus bar and the first portion has a recess that accommodates the second sealing member.

  (E) It is preferable that the first terminal portion has a first screw portion, and the connecting member has a second screw portion screwed with the first screw portion.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery (electric storage apparatus) 11 ... Case, 12 ... Case main body, 13 ... Cover, 14 ... Electrode assembly, 15 ... Positive electrode terminal part, 16 ... Negative electrode terminal part, 16b ... Through-hole, 16c ... 1st Part, 16d ... second part, 72b ... O-ring (second sealing member), 80 ... current interrupting part, 100 ... secondary battery module (power storage device module), 110 ... bus bar, 120 ... bolt (coupling member), 121 ... Bolt head (clamping part), 121b ... O-ring (first sealing member), 130 ... Power storage part.

Claims (3)

A power storage device module including a power storage unit,
The power storage unit includes a plurality of power storage devices, and the plurality of power storage devices include:
Case and
An electrode assembly housed in the case;
A first terminal portion electrically connected to the electrode assembly;
A second terminal portion having a polarity different from that of the first terminal portion and electrically connected to the electrode assembly,
The first terminal portion is
A first portion protruding outside the case;
A second portion protruding into the case;
A through hole opening in each of the first part and the second part;
A current that is arranged inside the case and that cuts off a current in a current-carrying path that electrically connects the electrode assembly and the first part when the pressure inside the case reaches a predetermined pressure. And a blocking part,
The power storage unit
A bus bar electrically connecting the plurality of power storage devices;
A connecting member connecting the first part and the bus bar,
The connecting member covers the opening of the through hole in the first part, and has a holding part that holds the bus bar between itself and the first part,
The power storage unit
A first sealing member that seals between the sandwiching portion and the bus bar;
A power storage device module including a second sealing member that seals between the bus bar and the first part.   The said 1st sealing member and the said 2nd sealing member are the cyclic | annular members arrange | positioned so that it may surround the axial center of this through-hole, when it sees from the axial center direction of the said through-hole. The power storage device module described.   The power storage device module according to claim 1, wherein the power storage device is a secondary battery.