JP2017183058A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of suppressing deformation of a hole engaged with a positioning projection.SOLUTION: An outside insulation member 57 of a secondary battery 10 has a positioning projection 58 projected toward a terminal connection member 44. The terminal connection member 44 has: a first hole 47 into which a bolt head 67 of an external connection terminal 66 is press-fitted; an insertion hole 48 into which a lead-out terminal 60 is inserted; and a second hole 45 engaged with the positioning projection 58. The first hole 47 and the second hole 45 are juxtaposed in a longitudinal direction of the terminal connection member 44. The terminal connection member 44 has a third hole 46 at a position sandwiched between the first hole 47 and the second hole 45 in the longitudinal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage device including an external connection terminal and an outer insulating member.

  Conventionally, vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) have been mounted with lithium-ion secondary batteries or nickel-hydrogen secondary batteries as power storage devices that store power supplied to electric motors and the like. . Generally, a secondary battery includes an electrode assembly in which a positive electrode and a negative electrode having an active material layer are stacked in layers, and a case for housing the electrode assembly. A terminal structure is connected to the positive electrode and the negative electrode through a conductive member.

  For example, the battery terminal structure disclosed in Patent Document 1 includes a rivet terminal 81 that penetrates the cover plate 80 and protrudes to the outside, as shown in FIG. The terminal structure includes an upper insulating sealing plate 82 disposed on the lid plate 80. The lower insulating crimping portion 81 a of the rivet terminal 81 passes through the upper insulating sealing plate 82.

  The terminal structure includes a terminal connection rod 83 disposed on the upper insulating sealing plate 82. The terminal connection rod 83 includes a fitting hole 83a, and the upper end caulking portion 81b of the rivet terminal 81 is fitted into the fitting hole 83a.

  The lid plate 80, the upper insulating sealing plate 82, and the terminal connection rod 83 are sandwiched between the lower end crimping portion 81 a and the upper end crimping portion 81 b of the rivet terminal 81. Further, the rivet terminal 81 and the terminal connection rod 83 are electrically connected by caulking.

The terminal structure includes terminal bolts 84. The terminal bolt 84 includes a bolt portion 84a. The bolt part 84 a is fitted in the through hole 83 b of the terminal connection rod 83.
In the terminal structure of Patent Document 1, a rivet terminal 81 is provided with a protrusion 81 c that serves as a positioning protrusion. The protrusion 81c is fitted into the sub-fitting hole 83c of the terminal connection rod 83, and the protrusion 81c is engaged with the inner surface of the sub-fitting hole 83c. By fitting the protrusion 81c into the sub-fitting hole 83c, the rotation of the terminal connection rod 83 around the caulking portions 81a and 81b is suppressed.

JP 2003-92103 A

  By the way, in the terminal structure of patent document 1, in order to improve the assembling property, the terminal bolt 84 is previously fitted and integrated with the through hole 83b of the terminal connection rod 83, and then the fitting hole 83a of the terminal connection rod 83 is obtained. In some cases, the upper end caulking portion 81b of the rivet terminal 81 is passed through. However, when the terminal bolt 84 is fitted to the terminal connection rod 83, the terminal connection rod 83 may be deformed by the fitting. Then, due to the deformation of the terminal connection rod 83, the opening width of the sub-fitting hole 83c is deformed so that the protrusion 81c cannot be fitted into the sub-fitting hole 83c. As a result, the rotation of the terminal connection rod 83 due to the engagement between the protrusion 81c and the sub-fitting hole 83c cannot be suppressed.

  The present invention has been made paying attention to the problems existing in the above-described prior art, and an object thereof is to provide a power storage device capable of suppressing deformation of a hole with which a positioning protrusion engages. .

  A power storage device for solving the above-described problems is provided with an electrode assembly in which electrodes having different polarities are insulated and stacked, a case housing the electrode assembly, and an outer side of a wall portion of the case An external connection terminal, an extraction terminal that is electrically connected to the electrode assembly, protrudes outside through the wall, and is disposed outside the wall, and the extraction terminal and the external A terminal connection member connected to the connection terminal, the external connection terminal and the wall portion are insulated from the outside of the wall portion, and the extraction terminal penetrates along a protruding direction of the extraction terminal from the wall portion. An outer insulating member, and the outer insulating member has a positioning protrusion protruding toward the terminal connecting member, and the terminal connecting member includes an insertion hole through which the lead terminal is inserted, A first hole into which the external connection terminal is press-fitted; A power storage device having a second hole engaged with the positioning protrusion, wherein the first hole and the second hole are arranged in parallel in the surface direction of the terminal connection member, The gist of the terminal connecting member is that a third hole is provided at a position sandwiched between the first hole and the second hole in the surface direction.

  According to this, when the external connection terminal is press-fitted into the first hole, the periphery of the first hole in the terminal connection member is deformed in a direction of expanding the first hole along the surface direction of the terminal connection member. . The deformation of the terminal connection member is absorbed when the opening width of the third hole is narrowed. For this reason, it is suppressed that a deformation | transformation of a terminal connection member reaches a 2nd hole. Therefore, even if the external connection terminal is press-fitted into the first hole, the positioning protrusion can be inserted into the second hole and the positioning protrusion can be engaged with the inner surface of the second hole. As a result, the rotation of the terminal connection member can be suppressed on the surface of the outer insulating member by the engagement of the positioning protrusion with the inner surface of the second hole.

  In the power storage device, the terminal connection member has a rectangular shape, the surface direction is a longitudinal direction of the terminal connection member, and the third hole has a length extending in a short direction of the terminal connection member. It may be a hole.

  According to this, even if any position in the short direction of the terminal connection member is deformed toward the second hole in a state where the external connection terminal is press-fitted into the first hole, the deformation is not changed to the third hole. Can be absorbed.

  The power storage device is a secondary battery.

  According to the present invention, deformation of the hole with which the positioning protrusion is engaged can be suppressed.

The disassembled perspective view which shows the secondary battery of embodiment. The perspective view which shows the external appearance of the secondary battery of embodiment. Sectional drawing which shows a terminal structure. (A) is a top view which shows a terminal connection member, (b) is a top view which shows the state which press-fitted the external connection terminal in the 1st hole. The figure which shows background art.

Hereinafter, an embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
As shown in FIG. 1 or FIG. 2, the secondary battery 10 as the power storage device includes a case 11. The secondary battery 10 includes an electrode assembly 12 accommodated in a case 11 and an electrolytic solution (not shown). The case 11 includes a rectangular box-shaped case member 14 and a rectangular flat plate-shaped lid member 15 that closes the opening 14 a of the case member 14. The lid member 15 constitutes a wall portion of the case 11. The secondary battery 10 of the present embodiment is a lithium ion battery.

  The electrode assembly 12 includes a plurality of sheet-like positive electrodes 21 and a plurality of sheet-like negative electrodes 31. The positive electrode 21 and the negative electrode 31 are electrodes having different polarities. Although not shown in detail, the positive electrode 21 has a positive metal foil (in this embodiment, an aluminum foil) and a positive electrode active material layer present on both surfaces of the positive metal foil. The negative electrode 31 has a negative electrode metal foil (copper foil in this embodiment) and a negative electrode active material layer present on both surfaces of the negative electrode metal foil. The electrode assembly 12 is a laminated type in which a plurality of positive electrodes 21 and a plurality of negative electrodes 31 are interposed between separators 24 to insulate them.

  The positive electrode 21 has a tab 25 having a shape protruding from a part of one side of the positive electrode 21. The negative electrode 31 has a tab 35 having a shape protruding from a part of one side of the negative electrode 31. The plurality of positive electrode tabs 25 and the plurality of negative electrode tabs 35 are respectively provided at positions where the positive electrode tab 25 and the negative electrode tab 35 do not overlap with each other in a state where the positive electrode 21 and the negative electrode 31 are stacked. . The electrode assembly 12 has a tab-side end face 12b from which the tabs 25 and 35 protrude.

  The secondary battery 10 includes a positive electrode tab group 36 protruding from the tab-side end surface 12b. The positive electrode tab group 36 is configured by collecting and stacking all the positive electrode tabs 25 on one end side in the stacking direction of the electrode assembly 12. The secondary battery 10 includes a negative electrode tab group 36 protruding from the tab-side end surface 12b. The negative electrode tab group 36 is configured by collecting and stacking all the negative electrode tabs 35 on one end side in the stacking direction of the electrode assembly 12.

  A positive electrode conductive member 51 is joined to the positive electrode tab group 36. A positive electrode tab group 36 is joined to one end in the longitudinal direction of the positive electrode conductive member 51. A positive lead terminal 60 is joined to the other longitudinal end of the positive electrode conductive member 51.

  A negative electrode conductive member 51 is joined to the negative electrode tab group 36. A negative electrode tab group 36 is joined to one end in the longitudinal direction of the negative electrode conductive member 51. A negative electrode lead terminal 60 is joined to the other end in the longitudinal direction of the negative electrode conductive member 51. Each conductive member 51 is disposed between the inner surface 15 d of the lid member 15 and the tab-side end surface 12 b of the electrode assembly 12.

  Next, the positive terminal structure 16 and the negative terminal structure 17 will be described. Since the positive electrode terminal structure 16 and the negative electrode terminal structure 17 have substantially the same configuration, common members will be described using the same member numbers. FIG. 3 shows only the positive electrode terminal structure 16.

  As shown in FIG. 1 or FIG. 3, the lid member 15 has an outer surface 15 c that faces the outer side of the case 11 and an inner surface 15 d that faces the inner side of the case 11. In the lid member 15, the direction connecting the outer surface 15c and the inner surface 15d with the shortest distance is defined as the thickness direction.

  The lid member 15 includes locking protrusions 18 on both sides in the longitudinal direction. Each locking projection 18 has a shape protruding from the outer surface 15c along the thickness direction. When the lid member 15 is viewed from the outer surface 15 c, the locking projection 18 has a ridge shape that extends in the longitudinal direction of the lid member 15. Each locking projection 18 is located at the center in the short direction of the lid member 15. The lid member 15 includes an insertion hole 15e on the outer side of each locking projection 18 in the longitudinal direction.

  The positive terminal structure 16 and the negative terminal structure 17 include an outer insulating member 57 disposed on the outer surface 15 c of the lid member 15. In the positive electrode terminal structure 16, the outer insulating member 57 insulates the positive external connection terminal 66 and the extraction terminal 60 from the lid member 15. In the negative electrode terminal structure 17, the outer insulating member 57 insulates the negative external connection terminal 66 and the lead terminal 60 from the lid member 15.

  The outer insulating member 57 is made of synthetic resin. The outer insulating member 57 has a rectangular shape when viewed from the outer surface 15 c of the lid member 15. The longitudinal direction of the outer insulating member 57 is along the longitudinal direction of the lid member 15, and the lateral direction of the outer insulating member 57 is along the lateral direction of the lid member 15. The outer insulating member 57 has a back surface 57a that faces the outer surface 15c of the lid member 15, and a front surface 57c that is parallel to the back surface 57a. In the outer insulating member 57, the direction connecting the back surface 57a and the front surface 57c is the thickness direction.

  The outer insulating member 57 includes a positioning protrusion 58 near one end in the longitudinal direction. The positioning protrusion 58 has a shape protruding in the thickness direction from the surface 57c. The positioning protrusion 58 has an elongated shape that extends in the short direction of the outer insulating member 57.

  The outer insulating member 57 includes a rotation stopper recess 59 that is recessed from the back surface 57a in the thickness direction near one end in the longitudinal direction. The anti-rotation recess 59 has an elongated shape extending in the longitudinal direction of the outer insulating member 57. The opening shape of the rotation preventing recess 59 is similar to the outer shape of the locking projection 18 when the lid member 15 is viewed from the outer surface 15 c, and is slightly smaller than the outer shape of the locking projection 18.

  The outer insulating member 57 is installed on the outer surface 15 c of the lid member 15 in a state where the locking protrusion 18 is inserted into the rotation stopper recess 59. The inner side surface of the rotation stopper recess 59 is in contact with the outer surface of the locking projection 18. Here, the lid member 15 is fixed to the case member 14. For this reason, movement of the outer insulating member 57 in the direction along the outer surface 15c of the lid member 15 is restricted by the contact of the inner surface of the anti-rotation recess 59 with the outer surface of the locking projection 18, and in particular, on the outer surface 15c. Rotation at is restricted.

The outer insulating member 57 includes an insertion hole 57d near the other end in the longitudinal direction. The insertion hole 57d is at a position that coincides with the insertion hole 15e of the lid member 15.
The positive terminal structure 16 and the negative terminal structure 17 include an external connection terminal 66 disposed outside the lid member 15. The external connection terminal 66 can fix the bus bar that electrically connects the secondary batteries 10 to the outside of the lid member 15. The external connection terminal 66 is made of metal.

  The external connection terminal 66 includes a disk-shaped bolt head 67 and a shaft portion 68 having a shape protruding from one end surface of the bolt head 67 along the axial direction of the external connection terminal 66. A nut for fastening a bus bar can be screwed onto the shaft portion 68. The bolt head 67 has a larger diameter than the shaft portion 68.

  The positive terminal structure 16 and the negative terminal structure 17 include a lead terminal 60. The lead terminal 60 is electrically connected to the tab group 36 via the conductive member 51. Therefore, the lead terminal 60 is electrically connected to the electrode assembly 12. The lead terminal 60 includes a connecting shaft portion 60 a that is electrically connected to a terminal connecting member 44 described later and a base portion 60 b that is electrically connected to the conductive member 51 in the axial direction. The lead terminal 60 is integrated with the conductive member 51 by joining the base 60 b to the conductive member 51.

  The positive terminal structure 16 and the negative terminal structure 17 include a terminal connection member 44. The terminal connection member 44 has a rectangular plate shape. The longitudinal direction of the terminal connecting member 44 is along the longitudinal direction of the lid member 15, and the short side direction of the terminal connecting member 44 is along the short side direction of the lid member 15. The terminal connection member 44 has a back surface 44 a that faces the outer insulating member 57 and a front surface 44 b that faces the outside of the case 11. In the terminal connection member 44, the direction connecting the back surface 44a and the front surface 44b with the shortest distance is defined as the thickness direction.

  As shown in FIG. 3 or FIG. 4A, the terminal connection member 44 includes a first hole 47 on one end side in the longitudinal direction. The first hole 47 is circular. The diameter of the first hole 47 is slightly larger than the diameter of the shaft portion 68 before the external connection terminal 66 is press-fitted. In the terminal connection member 44, the external connection terminal 66 is inserted into the first hole 47 and the bolt head 67 is press-fitted so that the diameter of the back surface 44 a is increased. An engagement surface 44c is formed in which the end surface of the portion 67 is engaged. The external connection terminal 66 is integrated with the terminal connection member 44 in a state of being prevented from rotating by press-fitting the bolt head 67 into the first hole 47.

  The terminal connection member 44 includes a second hole 45 near one end in the longitudinal direction that is the surface direction of the terminal connection member 44. The second hole 45 is adjacent to the first hole 47 in the longitudinal direction of the terminal connection member 44. The second hole 45 penetrates the terminal connection member 44 in the thickness direction. The second hole 45 has an elongated long hole shape extending in the short direction of the terminal connection member 44.

  A positioning protrusion 58 of the outer insulating member 57 is inserted into the second hole 45. The outer surface of the positioning protrusion 58 is in contact with the inner surface of the second hole 45. By this contact, the terminal connection member 44 is restricted from moving in any direction along the surface 57c of the outer insulating member 57, and the rotation on the surface 57c is restricted.

  The terminal connection member 44 includes a third hole 46 at a position adjacent to the second hole 45 along the longitudinal direction. The third hole 46 penetrates the terminal connection member 44 in the thickness direction. The third hole 46 has an elongated long hole shape extending in the short direction of the terminal connection member 44. The opening width of the third hole 46 along the longitudinal direction of the terminal connection member 44 is W. The third hole 46 is adjacent to the first hole 47 along the longitudinal direction of the terminal connection member 44. The third hole 46 is located closer to the second hole 45 than the first hole 47. The dimension L1 of the third hole 46 along the short direction of the terminal connection member 44 is longer than the dimension L2 of the first hole 47 along the short direction of the terminal connection member 44.

  The opening width W of the third hole 46 is wider than the deformation amount in the longitudinal direction of the terminal connection member 44 when the bolt head 67 of the external connection terminal 66 is press-fitted into the first hole 47. Therefore, when the external connection terminal 66 is press-fitted into the first hole 47 and the terminal connection member 44 is deformed in the longitudinal direction, the third hole 46 is not closed in the longitudinal direction of the terminal connection member 44 but is opened. Can be maintained.

  The terminal connection member 44 includes an insertion hole 48 near the other end in the longitudinal direction. The insertion hole 48 penetrates the terminal connection member 44 in the thickness direction. The insertion hole 48 is circular. The connecting shaft portion 60 a of the lead terminal 60 is inserted through the insertion hole 48.

  The positive terminal structure 16 and the negative terminal structure 17 have a seal ring 73. A shaft portion 60 a for connection of the lead terminal 60 is inserted through the seal ring 73. The seal ring 73 is supported by the base portion 60 b of the lead terminal 60. Moreover, the positive electrode terminal structure 16 and the negative electrode terminal structure 17 have the inner side insulation member 40 by which the connection axial part 60a was penetrated. The inner insulating member 40 has a square plate shape.

  A seal ring 73 is disposed inside the inner insulating member 40. The inner insulating member 40 covers the base portion 60 b of the lead terminal 60. The inner insulating member 40 regulates contact between the lid member 15 and the extraction terminal 60 and insulates the lid member 15 and the extraction terminal 60 from each other.

  The tip end portion of the connecting shaft portion 60a penetrating the insertion hole 48 of the terminal connecting member 44 is caulked in the axial direction, whereby the inner insulating member 40, the lid member 15, and the outer insulating member are connected by the connecting shaft portion 60a and the base portion 60b. 57 and the terminal connection member 44 are clamped. By this clamping, the lead terminal 60 is fixed to the lid member 15. The seal ring 73 is in close contact with the periphery of the insertion hole 15 e in the inner surface 15 d of the lid member 15 and seals the insertion hole 15 e of the lid member 15.

  The leading end of the connecting shaft portion 60a of the lead terminal 60 is locked to the surface of the terminal connecting member 44, and the lead terminal 60 and the terminal connecting member 44 are electrically connected by this locking. The base 60b of the lead terminal 60 contacts the conductive member 51, and the lead terminal 60 and the conductive member 51 are electrically connected by this contact.

Next, the operation of the secondary battery 10 will be described together with the assembling method.
First, the outer insulating member 57 is disposed on the outer surface 15 c of the lid member 15 in a state where the respective locking convex portions 18 of the lid member 15 are inserted into the rotation-preventing concave portions 59 of the outer insulating member 57.

  Next, as shown in FIG. 4B, the bolt head 67 of the external connection terminal 66 is press-fitted into the first hole 47 of the terminal connection member 44, and the terminal connection member 44 and the external connection terminal 66 are integrated. . At this time, the periphery of the first hole 47 in the terminal connection member 44 is deformed in a direction in which the first hole 47 is expanded along the surface direction of the terminal connection member 44. The deformation of the terminal connection member 44 is absorbed by deformation so as to narrow the opening width W of the third hole 46 along the longitudinal direction of the terminal connection member 44. At this time, the third hole 46 is not closed in the longitudinal direction of the terminal connection member 44 and is kept open.

  Next, the positioning protrusion 58 of the outer insulating member 57 is inserted into the second hole 45 of the terminal connecting member 44, and the terminal connecting member 44 is disposed on the surface 57 c of the outer insulating member 57. Next, the connecting shaft portion 60 a of the lead terminal 60 is inserted into the insertion hole 40 a and the seal ring 73 of the inner insulating member 40, and the connecting shaft portion 60 a is further inserted into the insertion hole 15 e of the lid member 15 and the outer insulating member 57. The insertion hole 57d and the terminal connection member 44 are inserted into the insertion holes 48. Then, by caulking the connecting shaft portion 60a of the lead terminal 60, the inner insulating member 40, the seal ring 73, the lid member 15, the outer insulating member 57, and the like between the base portion 60b and the distal end portion of the connecting shaft portion 60a, and The terminal connection member 44 is integrated.

  Next, the conductive member 51 is joined to the base portion 60 b of each extraction terminal 60. Then, the positive terminal structure 16 and the negative terminal structure 17 are formed on the lid member 15. Then, the tab group 36 having the same polarity is joined to each conductive member 51.

  The electrode assembly 12 is inserted into the case member 14 from the opening 14 a of the case member 14. After the electrode assembly 12 is inserted into the case member 14, the secondary battery 10 is assembled when the lid member 15 is joined to the open end of the case member 14.

According to the above embodiment, the following effects can be obtained.
(1) The terminal connection member 44 includes a third hole 46 adjacent to the first hole 47, and the third hole 46 is located between the first hole 47 and the second hole 45. For this reason, deformation of the terminal connection member 44 when the bolt head 67 of the external connection terminal 66 is press-fitted into the first hole 47 can be absorbed by deforming the third hole 46. Therefore, it is possible to suppress the deformation of the second hole 45 provided in parallel with the first hole 47 due to the press-fitting of the external connection terminal 66 into the first hole 47. As a result, the positioning protrusion 58 of the outer insulating member 57 can be inserted into the second hole 45 and the positioning protrusion 58 can be engaged with the second hole 45. Therefore, even when the external connection terminal 66 is press-fitted into the terminal connection member 44, the terminal connection member 44 can be kept from rotating with respect to the outer insulating member 57.

  (2) The third hole 46 has a long hole shape extending in the short direction of the terminal connection member 44. For this reason, when the external connection terminal 66 is press-fitted into the first hole 47, even if any position in the short direction of the terminal connection member 44 is deformed, the deformation can be absorbed by the third hole 46. .

  (3) In the longitudinal direction of the terminal connection member 44, the third hole 46 is located closer to the second hole 45 than the first hole 47. Therefore, it can be avoided that the third hole 46 is too close to the first hole 47 to completely absorb the deformation of the terminal connection member 44 and deform to the second hole 45.

  (4) The dimension L1 of the third hole 46 is longer than the dimension L2 of the first hole 47. For this reason, even if the deformation of the terminal connection member 44 occurs at any position along the short direction, the deformation of the third hole 46 can cope with the deformation.

  (5) Only one third hole 46 is provided in the terminal connection member 44 and has an elongated shape. For this reason, it is possible to avoid the conductive path of the terminal connection member 44 being reduced by the third hole 46 while providing the third hole 46 as a configuration for suppressing the deformation of the second hole 45.

In addition, you may change the said embodiment as follows.
The third hole 46 may be a circular hole shape instead of a long hole shape, or may be an elliptical hole shape whose length extends in the short direction of the terminal connection member 44. In short, as long as the deformation of the terminal connection member 44 can be absorbed by the third hole 46, the shape of the third hole 46 may be changed as appropriate.

A plurality of third holes 46 may be provided along the longitudinal direction of the terminal connection member 44.
A plurality of third holes 46 may be provided along the short direction of the terminal connection member 44, and a plurality of third holes 46 arranged in the short direction are arranged in the longitudinal direction of the terminal connection member 44. There may be more than one.

In the longitudinal direction of the terminal connecting member 44, the third hole 46 may be located between the second hole 45 and the first hole 47, or may be located closer to the first hole 47. Good.
○ The locking convex portion 18 may not be a ridge shape, but may be a square shape, a rectangular shape, an elliptical shape, or a round shape as viewed from the outer surface 15c of the lid member 15, A square shape, a rectangular shape, an elliptical shape, or a round shape may be used when viewed from the outer surface 15 c of the lid member 15.

The wall portion may be the side wall of the case member 14 instead of the lid member 15.
The electrode assembly may be a wound type instead of a laminated type.
The lead terminal 60 may be directly connected to the tab group 36 without passing through the conductive member 51.

The power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors.
The positive electrode 21 and the negative electrode 31 may have a structure in which an active material layer is present on one side of a metal foil.

  The secondary battery 10 may be a lithium ion secondary battery or another secondary battery. In short, any ion may be used as long as ions move between the active material for the positive electrode and the active material for the negative electrode and charge is transferred.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) The power storage device, wherein the third hole is located closer to the second hole than the first hole in the surface direction of the terminal connection member.

  (2) The terminal connection member has a rectangular plate shape, and the second hole, the third hole, and the first hole are juxtaposed in the longitudinal direction of the terminal connection member. The size of the third hole along the hand direction is a power storage device that is longer than the size of the first hole along the short direction of the terminal connecting member.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11 ... Case, 12 ... Electrode assembly, 15 ... Lid member as wall part, 15d ... Inner surface, 21 ... Positive electrode as electrode, 31 ... Negative electrode as electrode, 44 ... Terminal connection member 45 ... second hole, 46 ... third hole, 47 ... first hole, 48 ... insertion hole, 51 ... conductive member, 57 ... outer insulating member, 58 ... positioning protrusion, 60 ... lead terminal, 66 ... External connection terminal.

Claims (3)

An electrode assembly in which electrodes of different polarities are laminated and insulated from each other;
A case containing the electrode assembly;
An external connection terminal arranged outside the wall of the case;
A lead terminal electrically connected to the electrode assembly and projecting outside through the wall;
A terminal connecting member disposed outside the wall portion and connecting the lead terminal and the external connection terminal;
An outer insulating member that insulates the external connection terminal and the wall portion outside the wall portion, and through which the lead terminal penetrates along a protruding direction of the lead terminal from the wall portion,
The outer insulating member has a positioning protrusion having a shape protruding toward the terminal connection member,
The terminal connecting member is
An insertion hole through which the extraction terminal is inserted;
A first hole into which the external connection terminal is press-fitted;
A second hole engaged with the positioning protrusion,
The power storage device in which the first hole and the second hole are juxtaposed in the surface direction of the terminal connection member,
The power storage device, wherein the terminal connection member includes a third hole at a position sandwiched between the first hole and the second hole in the surface direction.   The terminal connection member has a rectangular shape, the surface direction is a longitudinal direction of the terminal connection member, and the third hole is a long hole extending in the short direction of the terminal connection member. The power storage device according to 1.   The power storage device according to claim 1, wherein the power storage device is a secondary battery.

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