JP2018206758A - Power storage device and manufacturing method of power storage device - Google Patents

Abstract

To provide a power storage device capable of insulating a tab group and a case, and to provide a manufacturing method of power storage device.SOLUTION: A secondary battery 10 includes an electrode assembly 12 where a positive electrode and a negative electrode are laminated, and having a positive electrode tab group 25a laminating positive electrode tabs 25 projecting from the tab side edge of the positive electrode, and a case 11 having a case body 13 for housing the electrode assembly 12. The secondary battery 10 includes a first insulation 61b for insulating the base end side bent part 29a of the positive electrode tab group 25a and the case body 13, a second insulation 62b for insulating the base end side bent part 29c of the positive electrode tab group 25a and the case body 13, a coupling part 63b for coupling the first insulation 61b and second insulation 62b in the lamination direction of the positive electrode and the negative electrode, and a second insulation cover 60b having a space S60b sandwiched by the facing surfaces C61b, C62b of the first and second insulations 61b, 62b. Assuming the direction along the tab side edge is the width direction, the space S60b is open on one side in the width direction.SELECTED DRAWING: Figure 1

Description

  The present invention includes an electrode assembly in which positive and negative electrodes are stacked and having a tab group, and a case for housing the electrode assembly, and at least one of one end and the other end of the tab group in the electrode stacking direction. Relates to a power storage device configured by bending and a method of manufacturing the power storage device.

  Conventionally, vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) have been mounted with lithium-ion secondary batteries, nickel-hydrogen secondary batteries, etc. as power storage devices that store the power supplied to the motor for travel. Yes. Generally, a secondary battery includes an electrode assembly that is laminated in a state where positive and negative electrodes are insulated, and a case that houses the electrode assembly. The electrode assembly has a tab group in which tabs protruding from a part of one side of the electrode are gathered together with the same polarity. The secondary battery disclosed in Patent Document 1 includes a spacer disposed between the tab group and the inner surface of the case in the stacking direction. The spacer has a configuration in which a first spacer portion covering the tab group from one end side in the stacking direction and a second spacer portion covering the tab group from the other end side in the stacking direction are assembled in the stacking direction. The spacer suppresses contact between the tab group and the inner surface of the case.

JP 2011-070918 A

  By the way, in order to reduce the dead space by the tab group along the protruding direction of the tab in the case, the tab group may not be protruded but may be bent from one end side to the other end side in the stacking direction. The bent tab group may be deformed so as to increase the dimension in the stacking direction due to the force of returning from the bent state to the original shape. At this time, when the tab group comes into contact with the spacer, the assembled state of the first spacer portion and the second spacer portion is released, and the insulation between the tab group and the case may not be ensured.

  SUMMARY An advantage of some aspects of the invention is that it provides a power storage device that can insulate a tab group from a case and a method for manufacturing the power storage device.

  A power storage device for solving the above-described problem includes a tab group in which a plurality of positive and negative electrodes are stacked in an insulated state, and tabs protruding from a part of one side of the electrodes are stacked with the same polarity. An electrode assembly, a case main body that accommodates the electrode assembly, and a case having a lid that closes an opening of the case main body, and one end and the other end of the tab group in the stacking direction of the electrodes At least one of the parts is a power storage device configured to be bent, and is disposed between one end of the tab group and the inner surface of the case body, and the one end of the tab group and the inner surface of the case body And a second insulation that is disposed between the other end of the tab group and the inner surface of the case body, and insulates the other end of the tab group and the inner surface of the case body. Part, the first insulating part and the second part An insulating member having a connecting portion that connects an edge portion in the stacking direction, and a space sandwiched between opposing surfaces of the first insulating portion and the second insulating portion in the stacking direction, and one side of the electrode When the direction along the direction is the width direction, the gist is that the space is open to at least one side of the width direction.

  According to this, even if the bent tab group is deformed so as to increase the dimension in the stacking direction by the force of returning to the original shape, even if it contacts the first insulating part or the second insulating part, it is connected. The portion suppresses displacement of the first and second insulating portions in the stacking direction. Therefore, the tab group and the case can be insulated by the insulating member. In addition, since the insulating member has a space opened in the width direction, even after the electrode assembly and the lid are assembled, the insulating member is slid in the width direction so that the first insulating portion of the tab group is The first insulating portion can be disposed between the one end portion and the case main body, and the second insulating portion can be disposed between the other end portion of the tab group and the case main body.

  Further, the power storage device is joined to the tab group having the same polarity, and is disposed between the lid and a tab-side end surface of the electrode assembly facing the inner surface of the lid and having the tab group. Preferably, the connecting portion is positioned between the conductive member and the tab side end surface of the electrode assembly, and insulates the conductive member and the electrode assembly.

Accordingly, the conductive member and the electrode assembly can be insulated by the connecting portion that connects the first insulating portion and the second insulating portion.
Further, in the power storage device, one end of the tab group is a base end side bent portion where a base end side portion of the tab group is bent, and the other end portion of the tab group is a tip end of the tab group. The tab group includes a surplus portion extending from the distal-end-side bent portion toward the proximal-end-side bent portion, and the insulating member extends from the connecting portion. It is preferable to have an extension part extending toward the tab group along the width direction, and the extension part covers an excess part of the tab group from the electrode assembly side.

  The surplus portion of the tab group may rotate toward the tab side end surface of the electrode assembly about the distal end side bent portion as the distal end side bent portion tries to return to the original shape. The surplus part of the tab group is covered from the electrode assembly side by the extending part. Therefore, even if the surplus portion rotates to the electrode assembly side, the surplus portion does not contact the tab side end surface of the electrode assembly due to the extending portion. Therefore, the tab group and the electrode assembly can be insulated.

  In the power storage device, the insulating member is erected on the lid side from an edge of the connecting portion, and is disposed between the conductive member and the inner surface of the case body, and the conductive member and the case It is preferable to have an insulating wall portion that insulates the inner surface of the main body.

According to this, the conductive member and the case main body can be insulated by the insulating wall portion.
Further, in the power storage device, the extending portion includes an intersection portion formed by intersecting a side surface and an upper surface facing the tab group at an edge portion along the width direction and an edge portion along the stacking direction. Have
It is preferable that at least one of the intersecting portion positioned at the edge portion along the width direction and the intersecting portion positioned at the edge portion along the stacking direction has a rounded shape.

  When attaching the insulating member to the conductive member, the intersecting portion of the extending portion and the tab group may come into contact with each other, but since the intersecting portion of the extending portion has a chamfered shape, The damage of the tab by contact with a tab group can be suppressed.

  In the power storage device, the insulating wall portion includes a first wall portion disposed between one end portion of the conductive member in the stacking direction and an inner surface of the case body, and the conductive member in the stacking direction. A second wall portion disposed between the other end portion and the inner surface of the case body, the first wall portion including a protrusion protruding toward the second wall portion, It is preferable that the two wall portions have a protrusion protruding toward the first wall portion, and the protrusion is supported by the conductive member.

According to this, an insulating member is assembled | attached to a conductive member because a protrusion is supported by a conductive member. Therefore, it can control that an insulating member moves to the electrode assembly side.
In the power storage device, the conductive member includes a recess at one end and the other end in the stacking direction, and the recess has a pair of inner surfaces facing in the width direction, and the first wall portion Preferably, the protrusion is housed in a recess at one end of the conductive member in the stacking direction, and the protrusion of the second wall is housed in a recess at the other end of the conductive member in the stacking direction.

According to this, when the insulating member tries to move in the width direction, the protrusion comes into contact with the inner surface of the recess. Therefore, the movement of the insulating member in the width direction can be restricted.
Moreover, about the said electrical storage apparatus, it is preferable that the said insulating member is located between the said electrically-conductive member and the inner surface of the said lid | cover, and is provided with the lid side insulating part which insulates the said electrically-conductive member and the said lid | cover.

According to this, the conductive member and the lid can be insulated by the lid side insulating portion.
Further, the power storage device is joined to the tab group having the same polarity, and is disposed between the lid and a tab-side end surface of the electrode assembly facing the inner surface of the lid and having the tab group. Preferably, the connecting portion is positioned between the conductive member and the inner surface of the lid, and insulates the conductive member and the lid.

According to this, the conductive member and the lid can be insulated by the connecting portion that connects the first insulating portion and the second insulating portion.
In a method for manufacturing a power storage device for solving the above-described problem, a plurality of positive and negative electrodes are stacked in an insulated state, and tabs protruding from a part of one side of the electrodes are stacked with the same polarity. An electrode assembly having a tab group, a case main body for housing the electrode assembly, and a case having a lid for closing an opening of the case main body, and one end of the tab group in the stacking direction of the electrodes And at least one of the other end portions is a method of manufacturing a power storage device configured to be bent, and when the direction along one side of the electrode is a width direction, the one end portion of the tab group and the case body A first insulating portion that insulates the inner surface, a second insulating portion that insulates the other end of the tab group and the inner surface of the case body, and the first insulating portion and the second insulating portion in the stacking direction. A connecting portion to be connected to the stacking method An insulating member provided with a space sandwiched between opposing surfaces of the first insulating portion and the second insulating portion in such a manner that the space is open to at least one side in the width direction, and the insulating member is The gist is to slide in the width direction and cover one end of the tab group with the first insulating portion and cover the other end of the tab group with the second insulating portion.

  According to this, even if the bent tab group is deformed so as to increase the dimension in the stacking direction by the force of returning to the original shape, even if it contacts the first insulating part or the second insulating part, it is connected. The portion suppresses displacement of the first and second insulating portions in the stacking direction. Therefore, the tab group and the case can be insulated by the insulating member. In addition, since the insulating member has a space opened in the width direction, even after the electrode assembly and the lid are assembled, the insulating member is slid in the width direction so that the first insulating portion of the tab group is The first insulating portion can be disposed between the one end portion and the case main body, and the second insulating portion can be disposed between the other end portion of the tab group and the case main body.

  According to the present invention, the tab group and the case can be insulated.

The disassembled perspective view of the secondary battery of 1st Embodiment. (A) is sectional drawing of the secondary battery of 1st Embodiment, (b) is XX sectional drawing of (a). The disassembled perspective view of the secondary battery of 2nd Embodiment. (A) is sectional drawing of the secondary battery of 2nd Embodiment, (b) is XX sectional drawing of (a). The disassembled perspective view of the secondary battery of 3rd Embodiment. The disassembled perspective view of the secondary battery of 4th Embodiment. (A) is a disassembled perspective view of the secondary battery of 5th Embodiment, (b) is an enlarged view of (a). (A) is sectional drawing of the secondary battery of 5th Embodiment, (b) is the XX sectional view of (a). The top view which shows the assembly | attachment state of the 2nd insulation cover and positive electrode electrically-conductive member of 5th Embodiment. The disassembled perspective view of the secondary battery of 6th Embodiment. Sectional drawing of the secondary battery of 6th Embodiment.

(First embodiment)
Hereinafter, a first embodiment in which a power storage device is embodied as a secondary battery will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, a secondary battery 10 as a power storage device includes a case 11. The secondary battery 10 includes an electrode assembly 12 accommodated in a case 11. The case 11 includes a rectangular parallelepiped case main body 13 and a rectangular flat lid 14 that closes the opening 13 a of the case main body 13. Both the case main body 13 and the lid 14 constituting the case 11 are made of metal (for example, stainless steel or aluminum). Further, the secondary battery 10 of the present embodiment is a prismatic battery whose appearance is square. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.

  The case body 13 includes a rectangular plate-shaped bottom wall 30, a pair of long side walls 31 erected from a pair of long side edges of the bottom wall 30, and a pair of erected from a pair of short side edges of the bottom wall 30. The short side wall 32. Hereinafter, the direction in which the long side wall 31 and the short side wall 32 stand from the bottom wall 30 along the surfaces of the long side wall 31 and the short side wall 32 is defined as a height direction. In the height direction, the bottom wall 30 side is the lower side, and the side opposite to the bottom wall 30 (the lid 14 side) is the upper side. In the lid 14, a surface facing the inside of the case 11 is an inner surface 14 a and a surface facing the outer side of the case 11 is an outer surface 14 b.

  As shown in FIG. 2B, the electrode assembly 12 includes a plurality of sheet-like positive electrodes 20, negative electrodes 21, and separators 22. The electrode assembly 12 has a layered structure in which a separator 22 is interposed between a positive electrode 20 and a negative electrode 21 and are laminated in a mutually insulated state.

  The positive electrode 20 includes a rectangular sheet-like positive electrode metal foil (for example, aluminum foil) 23 and a positive electrode active material layer 24 present on both surfaces of the positive electrode metal foil 23. The positive electrode 20 includes a tab side edge portion 20a as one side on one edge portion of the edge portions along the pair of long sides. The positive electrode 20 has a positive electrode tab 25 as a tab having a shape protruding from a part of the tab side edge portion 20a (see FIG. 1). The positive electrode tab 25 is composed of the positive electrode metal foil 23 itself without the positive electrode active material layer 24.

  The negative electrode 21 includes a rectangular sheet-like negative electrode metal foil (for example, copper foil) 26 and negative electrode active material layers 27 present on both surfaces of the negative electrode metal foil 26. The negative electrode 21 includes a tab side edge portion 21a as one side on one edge portion of the edge portions along the pair of long sides. The negative electrode 21 has a negative electrode tab 28 as a tab having a shape protruding from a part of the tab side edge 21a. The negative electrode tab 28 is composed of the negative electrode metal foil 26 itself without the negative electrode active material layer 27. The plurality of positive electrode tabs 25 and negative electrode tabs 28 are present at positions where the positive electrode tabs 25 and the negative electrode tabs 28 do not overlap in a state where the positive electrode 20 and the negative electrode 21 are stacked.

  The separator 22 has an insulating property and insulates the positive electrode 20 and the negative electrode 21. The direction in which the positive electrode 20, the negative electrode 21, and the separator 22 are stacked is defined as the stacking direction of the electrode assembly 12. The direction along the tab side edges 20a and 21a of the positive electrode 20 and the negative electrode 21 is defined as the width direction.

  Each positive electrode 20 is laminated so that the respective positive electrode tabs 25 are arranged in a row along the lamination direction. Similarly, each negative electrode 21 is laminated so that the respective negative electrode tabs 28 are arranged in a row along the lamination direction. The electrode assembly 12 includes a positive electrode tab group 25a in which all the positive electrode tabs 25 are gathered and stacked on one end side in the stacking direction. The electrode assembly 12 includes a negative electrode tab group 28a configured by stacking all the negative electrode tabs 28 on one end side in the stacking direction.

  The electrode assembly 12 includes a tab-side end surface 12a on an end surface where the positive electrode tab group 25a and the negative electrode tab group 28a are present. The tab side end face 12 a is formed by gathering together the tab side edge 20 a of the positive electrode 20 and the tab side edge 21 a of the negative electrode 21. The protruding directions of the positive electrode tab group 25a and the negative electrode tab group 28a from the tab side end surface 12a of the electrode assembly 12 are the same. In addition, the electrode assembly 12 includes a first side surface 12 b on an end surface facing the inner surface of one short side wall 32 of the case body 13, and a second side surface 12 c on an end surface facing the inner surface of the other short side wall 32. The first side surface 12b and the second side surface 12c are surfaces that make a pair in the width direction.

  The positive electrode tab group 25a and the negative electrode tab group 28a each include a proximal-side bent portion 29a in which a proximal-side portion in the protruding direction is bent from one end side to the other end side in the stacking direction. The proximal end side bent portion 29 a is one end portion of the positive electrode tab group 25 a and the negative electrode tab group 28 a in the stacking direction of the positive electrode 20 and the negative electrode 21. The positive electrode tab group 25a and the negative electrode tab group 28a include an extending portion 29b at a portion extending in the stacking direction on the distal end side with respect to the proximal end side bent portion 29a. The positive electrode tab group 25a and the negative electrode tab group 28a include a distal end side bent portion 29c in which a portion on the distal end side in the protruding direction is bent from the other end side in the stacking direction to one end side. The distal end side bent portion 29 c is the other end portion of the positive electrode tab group 25 a and the negative electrode tab group 28 a in the stacking direction of the positive electrode 20 and the negative electrode 21. The positive electrode tab group 25a and the negative electrode tab group 28a include a surplus portion 29d extending from the distal end side bent portion 29c toward the proximal end side bent portion 29a.

  A positive electrode conductive member 17 as a rectangular plate-shaped conductive member for electrically connecting the electrode assembly 12 and a positive electrode terminal structure 15 described later is joined to the positive electrode tab group 25a. Similarly, a negative electrode conductive member 18 as a rectangular plate-shaped conductive member for electrically connecting the electrode assembly 12 and a negative electrode terminal structure 16 described later is joined to the negative electrode tab group 28a. The positive electrode tab group 25 a is electrically connected to the lower end surface 17 a of the positive electrode conductive member 17 on the electrode assembly 12 side. The negative electrode tab group 28a is electrically connected to the lower end surface 18a of the negative electrode conductive member 18 on the electrode assembly 12 side. The positive electrode conductive member 17 and the negative electrode conductive member 18 are disposed between the inner surface 14 a of the lid 14 and the tab side end surface 12 a of the electrode assembly 12. The longitudinal directions of the positive electrode conductive member 17 and the negative electrode conductive member 18 coincide with the width direction.

  As shown in FIGS. 1 and 2A, each of the positive terminal structure 15 and the negative terminal structure 16 includes a lead terminal 51. The lead terminal 51 of the positive electrode has a plate-like joint portion 51 a and a shaft portion 51 b that protrudes from the joint portion 51 a and penetrates the lid 14. The joint 51 a of the positive lead terminal 51 is electrically connected to the upper end surface 17 b of the positive electrode conductive member 17 on the lid 14 side. The joint portion 51 a of the negative electrode lead terminal 51 is electrically connected to the upper end surface 18 b of the negative electrode conductive member 18 on the lid 14 side. As shown in FIG. 2A, the shaft portion 51b of each lead terminal 51 protrudes outward from the outer surface 14b of the lid 14, and the portion protruding outward is caulked. The positive electrode tab group 25 a exists closer to the center in the width direction than the lead terminal 51 of the positive electrode terminal structure 15, and the negative electrode tab group 28 a exists closer to the center in the width direction than the lead terminal 51 of the negative electrode terminal structure 16. That is, the positive electrode tab group 25a and the negative electrode tab group 28a exist between the extraction terminal 51 of the positive electrode terminal structure 15 and the extraction terminal 51 of the negative electrode terminal structure 16 in the width direction. The positive electrode terminal structure 15 and the negative electrode terminal structure 16 are electrically connected to the terminal connection member 52 electrically connected to the shaft portion 51 b of the lead terminal 51 on the outer surface 14 b of the lid 14 and electrically connected to the terminal connection member 52 outside the lid 14. A connected external connection terminal 53 is provided.

  The positive electrode terminal structure 15 and the negative electrode terminal structure 16 include an outer insulating member 54 that insulates the terminal connection member 52 and the external connection terminal 53 from the lid 14 on the outer surface 14 b of the lid 14. The positive terminal structure 15 and the negative terminal structure 16 include a plate-like inner insulating member 55 inside the case 11. The inner insulating member 55 of the positive electrode terminal structure 15 is disposed between the upper end surface 17 b of the positive electrode conductive member 17 and the inner surface 14 a of the lid 14 and insulates the positive electrode conductive member 17 and the lid 14. Similarly, the inner insulating member 55 of the negative electrode terminal structure 16 is disposed between the upper end surface 18 b of the negative electrode conductive member 18 and insulates the negative electrode conductive member 18 and the lid 14. The inner insulating member 55 has a through hole 55a penetrating in the thickness direction. The diameter of the through hole 55a is larger than the diameter of the shaft portion 51b. The shaft portion 51 b of each extraction terminal 51 passes through the inner insulating member 55, the outer insulating member 54, the lid 14, and the terminal connection member 52. The positive terminal structure 15 and the negative terminal structure 16 include a seal ring 56 disposed between the through hole 55 a of the inner insulating member 55 and the shaft portion 51 b of the lead terminal 51. The seal ring 56 seals the inside and outside of the case 11 by being in close contact with the periphery of the through-hole through which the shaft portion 51 b penetrates in the inner surface 14 a of the lid 14.

  In the case 11, the secondary battery 10 includes an insulating cover 60 as an insulating member positioned between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. The insulating cover 60 is made of resin. The insulating cover 60 includes a first insulating cover 60a, a second insulating cover 60b, and a third insulating cover 60c.

  The first insulating cover 60a includes a first insulating portion 61a, a second insulating portion 62a, and a third insulating portion 63a as a connecting portion. Each of the first to third insulating portions 61a to 63a has a flat plate shape.

  As shown in FIG. 2B, the first insulating portion 61a is disposed between the proximal-end-side bent portion 29a of the negative electrode tab group 28a and the inner surface 31a of the long side wall 31 of the case body 13, and the negative electrode tab group The base end side bent portion 29a of 28a and the case main body 13 are insulated. The second insulating portion 62 a is disposed between the distal end side bent portion 29 c of the negative electrode tab group 28 a and the inner surface 31 a of the long side wall 31 of the case body 13, and the distal end side bent portion 29 c of the negative electrode tab group 28 a and the case body 13. And insulate.

  In the first insulating cover 60a before assembly, the inner surface C61a as the facing surface of the first insulating portion 61a and the inner surface C62a as the facing surface of the second insulating portion 62a face each other in the stacking direction. The first insulating cover 60a includes a space S60a sandwiched between the inner surface C61a of the first insulating portion 61a and the inner surface C62a of the second insulating portion 62a. The space S60a is opened on one side in the width direction, and the other side is closed by the third insulating portion 63a. Further, in the first insulating cover 60a after assembly, the positions of the upper end surfaces A1, A2 of the first and second insulating portions 61a, 62a in the height direction are below the electrode assembly 12 side of the negative electrode conductive member 18. It coincides with the position of the end face 18a. In the height direction, the positions of the lower end surfaces B1 and B2 of the first and second insulating portions 61a and 62a coincide with the position of the tab side end surface 12a of the electrode assembly 12. The inner surface C61a of the first insulating portion 61a faces the proximal end side bent portion 29a of the negative electrode tab group 28a, and the inner surface C62a of the second insulating portion 62a faces the distal end side bent portion 29c of the negative electrode tab group 28a.

  As shown in FIG. 1, the third insulating portion 63a connects one end portion in the width direction of the first insulating portion 61a and one end portion in the width direction of the second insulating portion 62a in the stacking direction. As shown in FIG. 2A, the third insulating portion 63 a is disposed between the tab side end surface 12 a of the electrode assembly 12 and the lower end surface 18 a of the negative electrode conductive member 18. The third insulating portion 63 a is located below the lead terminal 51 of the negative electrode terminal structure 16. The third insulating portion 63 a insulates the electrode assembly 12 from the negative electrode conductive member 18.

  The second insulating cover 60b includes a first insulating portion 61b, a second insulating portion 62b, and a third insulating portion 63b as a connecting portion. Each of the first to third insulating portions 61b to 63b has a flat plate shape.

  Although not shown, the first insulating portion 61b is disposed between the proximal side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the long side wall 31 of the case body 13, and is bent toward the proximal side of the positive electrode tab group 25a. The part 29a and the case body 13 are insulated. The second insulating portion 62b is disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the inner surface 31a of the long side wall 31 of the case main body 13, and the front end side bent portion 29c of the positive electrode tab group 25a and the case main body 13 are disposed. And insulate.

  In the second insulating cover 60b before assembly, the inner surface C61b as the facing surface of the first insulating portion 61b and the inner surface C62b as the facing surface of the second insulating portion 62b face each other in the stacking direction. The second insulating cover 60b includes a space S60b sandwiched between the inner surface C61b of the first insulating portion 61b and the inner surface C62b of the second insulating portion 62b. The space S60b is opened on one side in the width direction, and the other side is closed by the third insulating portion 63b. Further, in the second insulating cover 60b after assembly, in the height direction, the positions of the upper end surfaces of the first and second insulating portions 61b and 62b are the positions of the lower end surface 17a of the positive electrode conductive member 17 on the electrode assembly 12 side. Match the position. In the height direction, the positions of the lower end surfaces of the first and second insulating portions 61 b and 62 b coincide with the position of the tab side end surface 12 a of the electrode assembly 12. The inner surface C61b of the first insulating portion 61b faces the proximal end side bent portion 29a of the positive electrode tab group 25a, and the inner surface C62b of the second insulating portion 62b faces the distal end side bent portion 29c of the positive electrode tab group 25a.

  The third insulating portion 63b connects one end portion in the width direction of the first insulating portion 61b and one end portion in the width direction of the second insulating portion 62b in the stacking direction. The third insulating portion 63 b is disposed between the tab side end surface 12 a of the electrode assembly 12 and the lower end surface 17 a of the positive electrode conductive member 17. The third insulating portion 63 b is located below the lead terminal 51 of the positive electrode terminal structure 15. The third insulating portion 63 b insulates the electrode assembly 12 from the positive electrode conductive member 17.

  The third insulating cover 60c has a flat plate shape. The third insulating cover 60 c is disposed between the upper end surfaces 17 b and 18 b on the lid 14 side of the positive electrode conductive member 17 and the negative electrode conductive member 18 and the inner surface 14 a of the lid 14. The third insulating cover 60 c insulates the positive electrode conductive member 17 and the negative electrode conductive member 18 from the lid 14.

Next, the attachment process of the 1st-3rd insulation covers 60a-60c which is a part of manufacturing process of the secondary battery 10 is demonstrated.
First, the positive terminal structure 15 and the negative terminal structure 16 are assembled to the lid 14. Specifically, the positive electrode conductive member 17 and the joint portion 51a of the lead terminal 51 are joined, and the negative electrode conductive member 18 and the joint portion 51a of the lead terminal 51 are joined. Next, the inner insulating member 55, the seal ring 56, and the third insulating cover 60 c are disposed on the upper end surface 17 b of the positive electrode conductive member 17 and the upper end surface 18 b of the negative electrode conductive member 18, and then the lid 14 is disposed. Thereby, the inner insulating member 55, the seal ring 56, and the gap between the upper end surface 17b of the positive electrode conductive member 17 and the inner surface 14a of the lid 14, and between the upper end surface 18b of the negative electrode conductive member 18 and the inner surface 14a of the lid 14, A third insulating cover 60c is interposed. The shaft portion 51 b of each extraction terminal 51 is inserted through the through hole 55 a of the inner insulating member 55, the seal ring 56, the outer insulating member 54, the lid 14, and the terminal connection member 52. Next, the tip of the shaft portion 51 b of each extraction terminal 51 is caulked, and the seal ring 56 is brought into close contact with the periphery of the insertion hole of the lid 14. Next, the positive electrode tab group 25a of the electrode assembly 12 and the positive electrode conductive member 17 are joined, and the negative electrode tab group 28a and the negative electrode conductive member 18 are joined. Thereby, the electrode assembly 12 and the lid | cover 14 are integrated.

  And the 1st insulating cover 60a is arrange | positioned in the width direction outer side rather than the 1st side surface 12b of the negative electrode terminal structure 16 and the electrode assembly 12. FIG. At this time, the first insulating cover 60a is arranged so that the first and second insulating portions 61a and 62a are closer to the negative electrode tab group 28a than the third insulating portion 63a. Thereby, the space S60a is in a state where one side in the width direction is opened toward the negative electrode tab group 28a. Next, the first insulating cover 60a is slid toward the center in the width direction, the negative electrode conductive member 18 is passed between the first and second insulating portions 61a and 62a, and the third insulating portion 63a is connected to the negative electrode conductive member 18. Between the lower end surface 18a of the electrode and the tab side end surface 12a of the electrode assembly 12. At this time, the distal end side portion of the negative electrode tab group 28a is bent in contact with the second insulating portion 62a, whereby the distal end side bent portion 29c is formed, and the third insulating portion 63a is connected to the negative electrode terminal structure 16. It is arranged below the lead terminal 51. Then, the first insulating portion 61a faces the proximal end side bent portion 29a of the negative electrode tab group 28a, and the second insulating portion 62a faces the distal end side bent portion 29c of the negative electrode tab group 28a.

  Similarly, the second insulating cover 60b is disposed outside the positive terminal structure 15 and the second side surface 12c of the electrode assembly 12 in the width direction. At this time, the second insulating cover 60b is arranged so that the first and second insulating portions 61b and 62b are closer to the positive electrode tab group 25a than the third insulating portion 63b. Thereby, the space S60b is in a state where one side in the width direction is opened toward the positive electrode tab group 25a. Next, the second insulating cover 60b is slid toward the center in the width direction, the positive electrode conductive member 17 is passed between the first and second insulating portions 61b and 62b, and the third insulating portion 63b is moved to the positive electrode conductive member 17. Between the lower end surface 17a of the electrode and the tab side end surface 12a of the electrode assembly 12. At this time, the distal end side portion of the positive electrode tab group 25a comes into contact with the second insulating portion 62b and bends to form the distal end side bent portion 29c, and the third insulating portion 63b It is arranged below the lead terminal 51. Then, the 1st insulating part 61b opposes the base end side bending part 29a of the positive electrode tab group 25a, and the 2nd insulating part 62b opposes the front end side bending part 29c of the positive electrode tab group 25a.

  Thereafter, the electrode assembly 12 is accommodated in the case main body 13. When the electrode assembly 12 is accommodated in the case main body 13, the first insulating portion 61a of the first insulating cover 60a is located between the proximal-side bent portion 29a of the negative electrode tab group 28a and the inner surface 31a of the case main body 13. The second insulating portion 62a is located between the distal end side bent portion 29c of the negative electrode tab group 28a and the inner surface 31a of the case body 13. The first insulating portion 61b of the second insulating cover 60b is located between the proximal end side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the case body 13, and the second insulating portion 62b is a positive electrode tab. It is located between the distal end side bent portion 29c of the group 25a and the inner surface 31a of the case body 13.

Next, the effect of 1st Embodiment is described with an effect | action.
(1) The base end side bent portion 29a and the distal end side bent portion 29c of the bent negative electrode tab group 28a are deformed so as to increase the dimension in the stacking direction by the force of returning to the original shape, Even if the first insulating portion 61a and the second insulating portion 62a of the insulating cover 60a are brought into contact with each other, the third insulating portion 63a suppresses the displacement of the first and second insulating portions 61a and 62a in the stacking direction. Therefore, the negative electrode tab group 28a and the case body 13 can be insulated by the first insulating cover 60a.

  Similarly, the base end side bent portion 29a and the distal end side bent portion 29c of the bent positive electrode tab group 25a are deformed so as to increase the dimension in the stacking direction by the force to return to the original shape, and the second Even if the first insulating portion 61b and the second insulating portion 62b of the insulating cover 60b come into contact with each other, the third insulating portion 63b suppresses the displacement of the first and second insulating portions 61b and 62b in the stacking direction. Therefore, the positive electrode tab group 25a and the case body 13 can be insulated by the second insulating cover 60b.

  (2) The spaces S60a and S60b of the first and second insulating covers 60a and 60b are opened on one side in the width direction. Therefore, even after the electrode assembly 12 and the lid 14 are assembled, the first insulating cover 61a is slid in the width direction so that the first insulating portion 61a is bent on the proximal side of the negative electrode tab group 28a. The second insulating portion 62a can be disposed between the distal-end-side bent portion 29c of the negative electrode tab group 28a and the case body 13 and can be disposed between the portion 29a and the case body 13. Similarly, by sliding the second insulating cover 60b in the width direction, the first insulating portion 61b can be disposed between the base end side bent portion 29a of the positive electrode tab group 25a and the case body 13, and the second insulating portion 62b can be disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the case body 13.

  (3) In the first insulating cover 60a, the negative electrode conductive member 18 and the electrode assembly 12 can be insulated by the third insulating portion 63a that connects the first insulating portion 61a and the second insulating portion 62a. Similarly, in the second insulating cover 60b, the positive electrode conductive member 17 and the electrode assembly 12 can be insulated by the third insulating portion 63b that connects the first insulating portion 61b and the second insulating portion 62b.

(Second Embodiment)
Hereinafter, a second embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS. 3 and 4. Note that the case 11, the electrode assembly 12, the positive electrode terminal structure 15, the negative electrode terminal structure 16, the positive electrode conductive member 17, and the negative electrode conductive member 18 have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIGS. 3, 4 (a), and 4 (b), the secondary battery 10 is disposed in the case 11 between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. An insulating cover 70 is provided as a positioned insulating member. The insulating cover 70 is made of resin. The insulating cover 70 includes a first insulating cover 70a and a second insulating cover 70b. The first insulating cover 70a and the second insulating cover 70b have the same configuration and are U-shaped.

  The 1st insulating cover 70a and the 2nd insulating cover 70b are provided with the 1st insulating part 71, the 2nd insulating part 72, and the 3rd insulating part 73 as a connection part. The first to third insulating portions 71 to 73 each have a flat plate shape.

  As shown in FIG. 4B, the first insulating portion 71 of the first insulating cover 70 a is between the proximal-side bent portion 29 a of the negative electrode tab group 28 a and the inner surface 31 a of the long side wall 31 of the case body 13. The base end side bent portion 29a of the negative electrode tab group 28a and the case body 13 are insulated from each other. The second insulating portion 72 is disposed between the distal end side bent portion 29 c of the negative electrode tab group 28 a and the inner surface 31 a of the long side wall 31 of the case main body 13, and the distal end side bent portion 29 c of the negative electrode tab group 28 a and the case main body 13. And insulate.

  In the first insulating cover 70a before assembly, the inner surface C71 as the facing surface of the first insulating portion 71 and the inner surface C72 as the facing surface of the second insulating portion 72 face each other in the stacking direction. The first insulating cover 70 a includes a space S 70 a sandwiched between the inner surface C 71 of the first insulating portion 71 and the inner surface C 72 of the second insulating portion 72. The space S70a is open on both sides in the width direction. In the first insulating cover 70a after assembly, the positions of the lower end surfaces 71a and 72a of the first and second insulating portions 71 and 72 in the height direction are the same as the position of the tab side end surface 12a of the electrode assembly 12. Match. The inner surface C71 of the first insulating portion 71 faces the proximal end side bent portion 29a of the negative electrode tab group 28a, and the inner surface C72 of the second insulating portion 72 faces the distal end side bent portion 29c of the negative electrode tab group 28a.

  As shown in FIG. 3, the third insulating portion 73 of the first insulating cover 70 a is formed by stacking the upper end portion in the height direction of the first insulating portion 71 and the upper end portion in the height direction of the second insulating portion 72. Connect in the direction. The width direction dimension X2 of the third insulating portion 73 is smaller than the shortest distance Y in the width direction between the positive electrode conductive member 17 and the negative electrode conductive member 18 (see FIG. 4A). The third insulating portion 73 is disposed between the upper end surface 18 b of the negative electrode conductive member 18 and the inner surface 14 a of the lid 14. The third insulating portion 73 insulates the negative electrode conductive member 18 and the lid 14.

  Although not shown, the first insulating portion 71 of the second insulating cover 70 b is disposed between the proximal-side bent portion 29 a of the positive electrode tab group 25 a and the inner surface 31 a of the long side wall 31 of the case body 13, and the positive electrode tab The base side bent portion 29a of the group 25a and the case body 13 are insulated. The second insulating portion 72 is disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the inner surface 31a of the long side wall 31 of the case main body 13, and the front end side bent portion 29c of the positive electrode tab group 25a and the case main body 13 are disposed. And insulate.

  In the second insulating cover 70b before assembly, the inner surface C71 as the facing surface of the first insulating portion 71 and the inner surface C72 as the facing surface of the second insulating portion 72 face each other in the stacking direction. The second insulating cover 70 b includes a space S 70 b sandwiched between the inner surface C 71 of the first insulating portion 71 and the inner surface C 72 of the second insulating portion 72. The space S70b is open on both sides in the width direction. In the second insulating cover 70b after assembly, the positions of the lower end surfaces 71a and 72a of the first and second insulating portions 71 and 72 in the height direction are the same as the position of the tab side end surface 12a of the electrode assembly 12. Match. The inner surface C71 of the first insulating portion 71 faces the proximal end side bent portion 29a of the positive electrode tab group 25a, and the inner surface C72 of the second insulating portion 72 faces the distal end side bent portion 29c of the positive electrode tab group 25a.

  The third insulating portion 73 of the second insulating cover 70b connects the upper end portion in the height direction of the first insulating portion 71 and the upper end portion in the height direction of the second insulating portion 72 in the stacking direction. The width direction dimension X2 of the third insulating portion 73 is smaller than the shortest distance Y in the width direction between the positive electrode conductive member 17 and the negative electrode conductive member 18 (see FIG. 4A). The third insulating portion 73 is disposed between the upper end surface 17 b of the positive electrode conductive member 17 and the inner surface 14 a of the lid 14. The third insulating portion 73 insulates the positive electrode conductive member 17 and the lid 14.

Next, an assembly process of the first and second insulating covers 70a and 70b, which is a part of the manufacturing process of the secondary battery 10, will be described.
First, the positive electrode tab group 25a of the electrode assembly 12 and the positive electrode conductive member 17 are joined, and the negative electrode tab group 28a and the negative electrode conductive member 18 are joined. Next, the positive electrode terminal structure 15 and the negative electrode terminal structure 16 are assembled to the lid 14, and the electrode assembly 12 and the lid 14 are integrated. At this time, the proximal end side bent portion 29a, the extended portion 29b, and the distal end side bent portion 29c are formed in the positive electrode tab group 25a and the negative electrode tab group 28a.

  The first insulating cover 70 a is disposed between the positive electrode conductive member 17 and the negative electrode conductive member 18 and between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. At this time, the first insulating cover 70a is arranged so that one side in the width direction in the space S70a is opened toward the positive electrode tab group 25a and the other side is opened toward the negative electrode tab group 28a. Thereafter, the first insulating cover 70a is slid from the center in the width direction toward the outside in the width direction (the first side surface 12b side of the electrode assembly 12), and the third insulating portion 73 is placed on the upper end surface 18b of the negative electrode conductive member 18. Deploy. Then, the first insulating portion 71 faces the proximal end side bent portion 29a of the negative electrode tab group 28a, and the second insulating portion 72 faces the distal end side bent portion 29c of the negative electrode tab group 28a. Similarly, the second insulating cover 70 b is disposed between the positive electrode conductive member 17 and the negative electrode conductive member 18 and between the tab side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. At this time, the second insulating cover 70b is arranged so that one side in the width direction in the space S70b is opened toward the positive electrode tab group 25a and the other side is opened toward the negative electrode tab group 28a. Thereafter, the second insulating cover 70 b is slid from the center in the width direction toward the outside in the width direction (the second side surface 12 c side of the electrode assembly 12), and the third insulating portion 73 is placed on the upper end surface 17 b of the positive electrode conductive member 17. Deploy. Then, the 1st insulating part 71 opposes the base end side bending part 29a of the positive electrode tab group 25a, and the 2nd insulating part 72 opposes the front end side bending part 29c of the positive electrode tab group 25a.

  Thereafter, the electrode assembly 12 is accommodated in the case main body 13. When the electrode assembly 12 is accommodated in the case main body 13, the first insulating portion 71 of the first insulating cover 70 a is interposed between the base end side bent portion 29 a of the negative electrode tab group 28 a and the inner surface 31 a of the case main body 13. The second insulating portion 72 is positioned between the distal end side bent portion 29 c of the negative electrode tab group 28 a and the inner surface 31 a of the case body 13. The first insulating portion 71 of the second insulating cover 70b is located between the proximal end side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the case body 13, and the second insulating portion 72 is formed of the positive electrode tab. It is located between the distal end side bent portion 29c of the group 25a and the inner surface 31a of the case body 13.

In the second embodiment, the following effect can be obtained in addition to the effect (1) of the first embodiment.
(4) In the first insulating cover 70 a, the negative electrode conductive member 18 and the lid 14 can be insulated by the third insulating portion 73 that connects the first insulating portion 71 and the second insulating portion 72. Similarly, in the second insulating cover 70 b, the positive electrode conductive member 17 and the lid 14 can be insulated by the third insulating portion 73 that connects the first insulating portion 71 and the second insulating portion 72.

  (5) Since the dimension X2 in the width direction of the third insulating portion 73 of the first insulating cover 70a is smaller than the shortest distance Y in the width direction between the positive electrode conductive member 17 and the negative electrode conductive member 18, the electrode assembly 12 and the lid 14, the first insulating cover 70 a is provided between the positive electrode conductive member 17 and the negative electrode conductive member 18 and between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. Can be placed. Thereafter, by sliding the first insulating cover 70a in the width direction, the first insulating portion 71 can be disposed between the base-end-side bent portion 29a of the negative electrode tab group 28a and the case body 13, and the second insulating portion 72. Can be disposed between the tip side bent portion 29c of the negative electrode tab group 28a and the case body 13.

  Similarly, since the dimension X2 in the width direction of the third insulating portion 73 of the second insulating cover 70b is smaller than the shortest distance Y in the width direction of the positive electrode conductive member 17 and the negative electrode conductive member 18, the electrode assembly 12 and the lid 14, the second insulating cover 70 b is provided between the positive electrode conductive member 17 and the negative electrode conductive member 18 and between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14. Can be placed. Thereafter, by sliding the second insulating cover 70b in the width direction, the first insulating portion 71 can be disposed between the base end side bent portion 29a of the positive electrode tab group 25a and the case main body 13, and the second insulating portion 72. Can be disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the case body 13.

(Third embodiment)
Hereinafter, a third embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIG. Note that the case 11, the electrode assembly 12, the positive electrode terminal structure 15, the negative electrode terminal structure 16, the positive electrode conductive member 17, and the negative electrode conductive member 18 have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 5, the secondary battery 10 includes an insulating cover 80 as an insulating member located between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14 in the case 11. The insulating cover 80 is made of resin. The insulating cover 80 includes a first insulating cover 80a and a second insulating cover 80b.

The first insulating cover 80a includes a first insulating portion 81, a second insulating portion 82, and a third insulating portion 83 as a connecting portion. The first to third insulating portions 81 to 83 each have a flat plate shape.
The first insulating portion 81 is disposed between the proximal side bent portion 29a of the positive electrode tab group 25a and the negative electrode tab group 28a and the inner surface 31a of the long side wall 31 of the case body 13, and the positive electrode tab group 25a and the negative electrode tab group The base end side bent portion 29a of 28a and the case main body 13 are insulated. The second insulating portion 82 is disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the negative electrode tab group 28a and the inner surface 31a of the long side wall 31 of the case body 13, and the positive electrode tab group 25a and the negative electrode tab group 28a. Insulating the distal end side bent portion 29c and the case body 13 from each other.

  In the first insulating cover 80a before assembly, the inner surface C81 as the facing surface of the first insulating portion 81 and the inner surface C82 as the facing surface of the second insulating portion 82 face each other in the stacking direction. The first insulating cover 80a includes a space S80a sandwiched between the inner surface C81 of the first insulating portion 81 and the inner surface C82 of the second insulating portion 72. The space S80a is opened on one side in the width direction, and the other side is closed by the third insulating portion 83. The width direction dimension X3 of the first and second insulating portions 81 and 82 is respectively the width direction dimension of the positive electrode tab group 25a, the width direction dimension of the negative electrode tab group 28a, and the positive electrode tab group 25a and the negative electrode tab group 28a. It is more than the sum of the shortest distances in the width direction. Therefore, in the first insulating cover 80a after assembly, the inner surface C81 of the first insulating portion 81 is opposed to the base end side bent portion 29a of the positive electrode tab group 25a and the negative electrode tab group 28a, and the inner surface of the second insulating portion 82 C82 faces the distal end side bent portion 29c of the positive electrode tab group 25a and the negative electrode tab group 28a.

  The third insulating portion 83 connects one end portion in the width direction of the first insulating portion 81 and one end portion in the width direction of the second insulating portion 82 in the stacking direction. The third insulating portion 83 is disposed between the tab side end surface 12 a of the electrode assembly 12 and the lower end surface 18 a of the negative electrode conductive member 18. The third insulating portion 83 is located below the lead terminal 51 of the negative electrode terminal structure 16. The third insulating portion 83 insulates the electrode assembly 12 from the negative electrode conductive member 18.

  The second insulating cover 80b has a flat plate shape. The second insulating cover 80 b is disposed between the lower end surface 17 a of the positive electrode conductive member 17 and the tab side end surface 12 a of the electrode assembly 12. The second insulating cover 80 b is located below the lead terminal 51 of the positive terminal structure 15. The second insulating cover 80 b insulates the positive electrode conductive member 17 and the electrode assembly 12.

  The first and second insulating covers 80a and 80b can be attached in the same manner as the first and second insulating covers 60a and 60b in the first embodiment, and the description thereof will be omitted. To do.

In the third embodiment, the following effects can be obtained in addition to the same effects as the effects (1) to (3) of the first embodiment.
(6) Both the positive electrode tab group 25a and the negative electrode tab group 28a can be insulated from the case main body 13 by one first insulating cover 80a. In other words, the insulating part that insulates the positive electrode tab group 25a and the case body 13 and the insulating part that insulates the negative electrode tab group 28a and the case body 13 are integrated. In this case, the number of parts can be reduced as compared with the configuration in which the positive electrode tab group 25a and the negative electrode tab group 28a are separately insulated from the inner surface 31a of the case body 13.

(Fourth embodiment)
A fourth embodiment in which the power storage device is embodied as a secondary battery will be described below with reference to FIG. Note that the case 11, the electrode assembly 12, the positive electrode terminal structure 15, the negative electrode terminal structure 16, the positive electrode conductive member 17, and the negative electrode conductive member 18 have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 6, the secondary battery 10 includes an insulating cover 90 as an insulating member positioned between the tab-side end surface 12 a of the electrode assembly 12 and the inner surface 14 a of the lid 14 in the case 11. The insulating cover 90 is made of resin. The insulating cover 90 includes a first insulating cover 90a and a second insulating cover 90b. The first insulating cover 90a and the second insulating cover 90b have the same configuration and have a U shape.

The first insulating cover 90 a and the second insulating cover 90 b include a flat plate-like first insulating portion 91, a second insulating portion 92, and a connecting portion 93.
The first insulating portion 91 of the first insulating cover 90a is disposed between the proximal-end-side bent portion 29a of the negative electrode tab group 28a and the inner surface 31a of the long side wall 31 of the case body 13, and the base of the negative electrode tab group 28a. The end-side bent portion 29a and the case body 13 are insulated. The second insulating portion 92 is disposed between the distal end side bent portion 29 c of the negative electrode tab group 28 a and the inner surface 31 a of the long side wall 31 of the case body 13, and the distal end side bent portion 29 c of the negative electrode tab group 28 a and the case main body 13. And insulate. The width direction dimension X4 of the first insulating portion 91 and the second insulating portion 92 is smaller than the shortest distance Y in the width direction of the positive electrode conductive member 17 and the negative electrode conductive member 18, respectively.

  In the first insulating cover 90a before assembly, the inner surface C91 as the facing surface of the first insulating portion 91 and the inner surface C92 as the facing surface of the second insulating portion 92 face each other in the stacking direction. The first insulating cover 90a includes a space S90a sandwiched between the inner surface C91 of the first insulating portion 91 and the inner surface C92 of the second insulating portion 92. The space S90a is opened on one side in the width direction, and the other side is closed by a connecting portion 93. Further, in the assembled first insulating cover 90a, the inner surface C91 of the first insulating portion 91 is opposed to the proximal end side bent portion 29a of the negative electrode tab group 28a, and the inner surface C92 of the second insulating portion 92 is the negative electrode tab. It opposes the front end side bent portion 29c of the group 28a.

  The connecting portion 93 of the first insulating cover 90a connects one end portion in the width direction of the first insulating portion 91 and one end portion in the width direction of the second insulating portion 92 in the stacking direction. The connecting portion 93 is disposed closer to the center in the width direction than the negative electrode tab group 28a.

  The first insulating portion 91 of the second insulating cover 90b is disposed between the proximal side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the long side wall 31 of the case body 13, and the base of the positive electrode tab group 25a. The end-side bent portion 29a and the case body 13 are insulated. The second insulating portion 92 is disposed between the distal end side bent portion 29c of the positive electrode tab group 25a and the inner surface 31a of the long side wall 31 of the case main body 13, and the front end side bent portion 29c of the positive electrode tab group 25a and the case main body 13 are disposed. And insulate. The width direction dimension X4 of the first insulating portion 91 and the second insulating portion 92 is smaller than the shortest distance Y in the width direction of the positive electrode conductive member 17 and the negative electrode conductive member 18, respectively.

  In the second insulating cover 90b before assembly, the inner surface C91 as the facing surface of the first insulating portion 91 and the inner surface C92 as the facing surface of the second insulating portion 92 face each other in the stacking direction. The second insulating cover 90b includes a space S90b sandwiched between the inner surface C91 of the first insulating portion 91 and the inner surface C92 of the second insulating portion 92. The space S90b is opened on one side in the width direction, and the other side is closed by a connecting portion 93. Further, in the second insulating cover 90b after assembly, the inner surface C91 of the first insulating portion 91 faces the proximal end side bent portion 29a of the positive electrode tab group 25a, and the inner surface C92 of the second insulating portion 92 is formed of the positive electrode tab. It opposes the distal end side bent portion 29c of the group 25a.

  The connecting portion 93 of the second insulating cover 90b connects one end portion in the width direction of the first insulating portion 91 and one end portion in the width direction of the second insulating portion 92 in the stacking direction. The connecting portion 93 is disposed closer to the center in the width direction than the positive electrode tab group 25a.

  The first and second insulating covers 90a and 90b can be attached in the same manner as the first and second insulating covers 70a and 70b in the second embodiment, and the description thereof will be omitted. To do.

In the fourth embodiment, the same effect as the effect (1) of the first embodiment and the effect (5) of the second embodiment can be obtained.
(Fifth embodiment)
Hereinafter, a fifth embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS. Note that the case 11, the electrode assembly 12, the positive terminal structure 15, the negative terminal structure 16, and the third insulating cover 60c have the same configurations as those of the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 7A, the positive electrode conductive member 17 includes a recess 171 at one end 17c and the other end 17d in the stacking direction, and the negative electrode conductive member 18 includes one end 18c and the other end 18d in the stacking direction. Is provided with a recess 181. Each of the recesses 171 and 181 has a pair of inner surfaces facing each other in the longitudinal direction of the positive electrode conductive member 17 and the negative electrode conductive member 18, that is, the width direction. Each of the recesses 171 and 181 opens to the upper end surfaces 17b and 18b, and the lower end surfaces 17a and 18a are closed.

  As shown in FIGS. 7A, 8A, and 8B, the first insulating cover 60d of the present embodiment is similar to the first insulating cover 60a of the first embodiment. A first insulating portion 61a, a second insulating portion 62a, and a third insulating portion 63a as a connecting portion are provided. The third insulating portion 63a has an extending edge 631 at the edge along the stacking direction and positioned on the first insulating portion 61a and second insulating portion 62a side in the width direction. One end on the third insulating portion 63a side in the width direction of the first insulating portion 61a and the second insulating portion 62a is located on a straight line along the extended edge portion 631. The third insulating portion 63a of the present embodiment includes a rectangular plate-like extending portion 64 that extends from the extending edge portion 631 toward the negative electrode tab group 28a in the width direction. As shown in FIG. 8B, the extending portion 64 covers the surplus portion 29d of the negative electrode tab group 28a from the electrode assembly 12 side.

  As shown in FIGS. 7A, 8A, and 9, the second insulating cover 60e of the present embodiment is similar to the second insulating cover 60b of the first embodiment. A portion 61b, a second insulating portion 62b, and a third insulating portion 63b as a connecting portion are provided. The third insulating portion 63b has an extending edge 631 at the edge along the stacking direction and is positioned on the first insulating portion 61b and second insulating portion 62b side in the width direction. One end on the third insulating portion 63b side in the width direction of the first insulating portion 61b and the second insulating portion 62b is located on a straight line along the extended edge portion 631. The third insulating portion 63b of the present embodiment includes a rectangular plate-like extending portion 64 extending from the extending edge portion 631 toward the positive electrode tab group 25a in the width direction. The extending part 64 covers the surplus part 29d of the positive electrode tab group 25a from the electrode assembly 12 side.

  Of the pair of edges along the width direction of each extending part 64, one edge is continuous with the second insulating parts 62a and 62b in the stacking direction, and the first edge 64a, which is the other edge, It is spaced apart from the first insulating parts 61a and 61b in the stacking direction. Each extending portion 64 has a second edge portion 64b along the stacking direction and is located on the opposite side to each third insulating portion 63a, 63b in the width direction. As shown in FIG. 7B, each extending portion 64 includes a side surface that forms the thickness of the extending portion 64 on the first edge portion 64a and the second edge portion 64b, and the positive electrode tab group 25a or the negative electrode tab group 28a. And an upper surface opposed to each other. Each intersection R has a chamfered shape.

  The third insulating portions 63a and 63b of the first and second insulating covers 60d and 60e of the present embodiment are rectangular plate-shaped insulating members that are erected from the three edge portions excluding the extended edge portion 631 toward the lid 14. It has the 1st-3rd wall parts 65a-65c as a wall part. The first wall portion 65a is positioned on the first insulating portions 61a and 61b side in the stacking direction, and the second wall portion 65b is positioned on the second insulating portions 62a and 62b side in the stacking direction. The third wall portion 65c is located on the case body 13 side that is opposite to the extending portion 64 in the width direction. The longitudinal directions of the first wall portion 65a and the second wall portion 65b coincide with the width direction. The longitudinal direction of the third wall portion 65c coincides with the stacking direction.

  One end in the width direction of the first wall portion 65a is continuous with one end in the width direction of the first insulating portions 61a and 61b, and the other end in the width direction of the first wall portion 65a is in the stacking direction of the third wall portion 65c. Continuous with one end. That is, in the present embodiment, one end side in the longitudinal direction of the single rectangular plate is the first wall portion 65a, and the other end side in the longitudinal direction is the first insulating portions 61a and 61b. Further, the boundary between the first wall portion 65a and the first insulating portions 61a and 61b is located on a straight line along the extended edge portion 631 of the third insulating portions 63a and 63b. Similarly, one end in the width direction of the second wall portion 65b is continuous with one end in the width direction of the second insulating portions 62a and 62b, and the other end in the width direction of the second wall portion 65b is in the third wall portion 65c. It is continuous with the other end in the stacking direction. That is, in the present embodiment, one end side in the longitudinal direction of the rectangular single plate is the second wall portion 65b, and the other end side in the longitudinal direction is the second insulating portions 62a and 62b. Further, the boundary between the second wall portion 65b and the second insulating portions 62a and 62b is located on a straight line along the extending edge portion 631 of the third insulating portions 63a and 63b.

  As shown in FIG. 9, in the second insulating cover 60e, the first insulating portion 61b, the second insulating portion 62b, and the first to third wall portions 65a to 65c are in the width direction when viewed from the height direction. It is U-shaped opening toward the center. Similarly, in the first insulating cover 60d, the first insulating portion 61a, the second insulating portion 62a, and the first to third wall portions 65a to 65c are directed toward the center in the width direction when viewed from the height direction. It is U-shaped to open.

  The first wall portion 65a of the first insulating cover 60d is disposed between the one end portion 18c in the stacking direction of the negative electrode conductive member 18 and the inner surface 31a of the long side wall 31 of the case main body 13, and the negative electrode conductive member 18 and the case. The main body 13 is insulated. As shown in FIG. 8A, the second wall portion 65 b of the first insulating cover 60 d is formed between the other end portion 18 d in the stacking direction of the negative electrode conductive member 18 and the inner surface 31 a of the long side wall 31 of the case body 13. It arrange | positions between and insulates the negative electrode electrically-conductive member 18 and the case main body 13 from each other. The third wall portion 65c of the first insulating cover 60d is disposed between the end side end portion 18e near the case 11 in the longitudinal direction of the negative electrode conductive member 18 and the inner surface 32a of the short side wall 32 of the case body 13. The negative electrode conductive member 18 and the case body 13 are insulated.

  The first wall portion 65a of the second insulating cover 60e is disposed between the one end portion 17c in the stacking direction of the positive electrode conductive member 17 and the inner surface 31a of the long side wall 31 of the case body 13, and the positive electrode conductive member 17 and the case The main body 13 is insulated. The second wall portion 65b of the second insulating cover 60e is disposed between the other end portion 17d in the stacking direction of the positive electrode conductive member 17 and the inner surface 31a of the long side wall 31 of the case body 13, and the positive electrode conductive member 17 and Insulates the case body 13. The third wall portion 65c of the second insulating cover 60e is disposed between the end side end portion 17e near the case 11 in the longitudinal direction of the positive electrode conductive member 17 and the inner surface 32a of the short side wall 32 of the case body 13. The positive electrode conductive member 17 and the case body 13 are insulated.

  As shown in FIGS. 7A and 9, each first wall portion 65 a has a protrusion 66 that is elastically deformed on a surface facing the second wall portion 65 b. The protrusion 66 of the first wall 65 a of the second insulating cover 60 e is accommodated in a recess 171 formed at one end 17 c in the stacking direction of the positive electrode conductive member 17. The protrusion 66 of the first wall 65a of the first insulating cover 60d is accommodated in a recess 181 formed at one end 18c of the negative electrode conductive member 18 in the stacking direction. Each of the second wall portions 65b has a protrusion 66 that is elastically deformed on the surface facing the first wall portion 65a. The protrusion 66 of the second wall 65b of the second insulating cover 60e is accommodated in a recess 171 formed at the other end 17d of the positive electrode conductive member 17 in the stacking direction. The protrusion 66 of the second wall portion 65b of the first insulating cover 60d is accommodated in a recess 181 formed at the other end portion 18d of the negative electrode conductive member 18 in the stacking direction.

  Next, the assembly process of the first insulating cover 60d to the negative electrode conductive member 18 will be described in detail. The process of assembling the second insulating cover 60e with respect to the positive electrode conductive member 17 is the same as the process of assembling the first insulating cover 60d with respect to the negative electrode conductive member 18, and the description thereof will be omitted. Further, description of the same steps as those in the first embodiment will be omitted.

  When the first insulating cover 60d is slid toward the center in the width direction, the negative electrode conductive member 18 is located between the first insulating portion 61a and the second insulating portion 62a, and between the first wall portion 65a and the second wall portion 65b. Between. Further, the base end side bent portion 29a of the negative electrode tab group 28a is inserted into the gap between the first insulating portion 61a and the first edge portion 64a of the extending portion 64, and the surplus portion 29d of the negative electrode tab group 28a and the electrode assembly. The extension part 64 is inserted between the 12 tab side end faces 12a. The third insulating portion 63 a is inserted between the lower end surface 18 a of the negative electrode conductive member 18 and the tab side end surface 12 a of the electrode assembly 12. The protrusion 66 of the first wall portion 65a is pressed and compressed by the one end portion 18c in the stacking direction of the negative electrode conductive member 18 while the first insulating cover 60d is being slid. Return to. Similarly, the protrusion 66 of the second wall portion 65b is pressed and compressed by the other end portion 18d in the stacking direction of the negative electrode conductive member 18 while the first insulating cover 60d is being slid, but is accommodated in the recess 181. Return to the original shape.

  Thereafter, the electrode assembly 12 is accommodated in the case main body 13. When the electrode assembly 12 is accommodated in the case main body 13, the first insulating portion 61 a of the first insulating cover 60 d is between the proximal-side bent portion 29 a of the negative electrode tab group 28 a and the inner surface 31 a of the case main body 13. The second insulating portion 62a is located between the distal end side bent portion 29c of the negative electrode tab group 28a and the inner surface 31a of the case body 13. Similarly, the first insulating portion 61b of the second insulating cover 60e is located between the proximal end side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the case body 13, and the second insulating portion 62b It is located between the distal end side bent portion 29c of the tab group 25a and the inner surface 31a of the case body 13.

  The first wall portion 65a of the first insulating cover 60d is located between the one end portion 18c in the stacking direction of the negative electrode conductive member 18 and the inner surface 31a of the case body 13, and the second wall portion 65b is negative electrode conductive. The third wall 65c is located between the other end 18d in the stacking direction of the member 18 and the inner surface 31a of the case body 13, and the third wall 65c is formed between the end 18e of the negative electrode conductive member 18 and the inner surface 32a of the case body 13. Located between. Similarly, the first wall portion 65a of the second insulating cover 60e is located between the one end portion 17c in the stacking direction of the positive electrode conductive member 17 and the inner surface 31a of the case body 13, and the second wall portion 65b is a positive electrode. The third wall 65c is located between the other end portion 17d of the conductive member 17 in the stacking direction and the inner surface 31a of the case body 13, and the third wall portion 65c is connected to the end portion 17e of the positive electrode conductive member 17 and the inner surface 32a of the case body 13. Located between.

In the fifth embodiment, the following effects can be obtained in addition to the same effects as the effects (1) to (3) of the first embodiment.
(7) The surplus portion 29d of the negative electrode tab group 28a and the positive electrode tab group 25a is formed so that the distal end side bent portion 29c tries to return to the original shape. It may turn toward The surplus portion 29d of the negative electrode tab group 28a is covered from the electrode assembly 12 side by the extending portion 64 of the first insulating cover 60d. Therefore, even if the surplus portion 29 d rotates to the electrode assembly 12 side, the surplus portion 29 d does not contact the tab side end surface 12 a of the electrode assembly 12 due to the extending portion 64. Therefore, the negative electrode tab group 28a and the electrode assembly 12 can be insulated. Similarly, the surplus portion 29d of the positive electrode tab group 25a is covered with the extending portion 64 of the second insulating cover 60e. Therefore, even if the surplus portion 29 d rotates toward the electrode assembly 12, the surplus portion 29 d does not contact the tab side end surface 12 a of the electrode assembly 12 due to the extending portion 64. Therefore, the positive electrode tab group 25a and the electrode assembly 12 can be insulated.

  (8) The first wall portion 65a of the first insulating cover 60d can insulate the case body 13 from the one end portion 18c of the negative electrode conductive member 18 in the stacking direction. The second wall portion 65b of the first insulating cover 60d can insulate the other end portion 18d of the negative electrode conductive member 18 in the stacking direction and the case body 13 from each other. The third wall portion 65c of the first insulating cover 60d can insulate the end side end portion 18e of the negative electrode conductive member 18 and the case main body 13 from each other.

  Similarly, the first wall portion 65a of the second insulating cover 60e can insulate the case main body 13 from the one end portion 17c of the positive electrode conductive member 17 in the stacking direction. The second wall portion 65b of the second insulating cover 60e can insulate the other end portion 17d of the positive electrode conductive member 17 in the stacking direction and the case body 13 from each other. The third wall portion 65c of the second insulating cover 60e can insulate the end-side end portion 17e of the positive electrode conductive member 17 and the case body 13 from each other.

  (9) When the first insulating cover 60d is attached to the negative electrode conductive member 18, the intersecting portion R of the extending portion 64 may come into contact with the negative electrode tab group 28a. Similarly, when the second insulating cover 60e is attached to the positive electrode conductive member 17, the intersecting portion R of the extending portion 64 may come into contact with the positive electrode tab group 25a. The intersecting portion R of each extending portion 64 of the present embodiment has a chamfered shape. Therefore, damage to the positive electrode tab 25 or the negative electrode tab 28 due to contact between the intersecting portion R of the extending portion 64 and the positive electrode tab group 25a or the negative electrode tab group 28a can be suppressed.

  (10) The first insulating cover 60 d has a protrusion 66. The first insulating cover 60 d is assembled to the negative electrode conductive member 18 by the protrusion 66 being supported by the negative electrode conductive member 18. Therefore, the movement of the first insulating cover 60d to the lower side in the height direction (the electrode assembly 12 side) can be restricted. Similarly, the second insulating cover 60 e has a protrusion 66. The second insulating cover 60 e is assembled to the positive electrode conductive member 17 by the protrusion 66 being supported by the positive electrode conductive member 17. Therefore, the movement of the second insulating cover 60e to the lower side in the height direction (the electrode assembly 12 side) can be restricted.

  (11) The first insulating cover 60d includes protrusions 66 on the first wall 65a and the second wall 65b. The negative electrode conductive member 18 includes a recess 181 at one end 18c and the other end 18d in the stacking direction. The recess 181 has a pair of inner surfaces that face in the width direction. The protrusion 66 is accommodated in the recess 181. For this reason, when the first insulating cover 60d attempts to move in the width direction, the protrusion 66 contacts the inner surface of the recess 171. Therefore, the movement of the first insulating cover 60d in the width direction can be restricted. Similarly, the second insulating cover 60e includes protrusions 66 on the first wall portion 65a and the second wall portion 65b. The positive electrode conductive member 17 includes a recess 171 at one end 17c and the other end 17d in the stacking direction. The recess 171 has a pair of inner surfaces that face in the width direction. The protrusion 66 is accommodated in the recess 171. For this reason, when the second insulating cover 60 e tries to move in the width direction, the protrusion 66 contacts the inner surface of the recess 171. Therefore, the movement of the second insulating cover 60e in the width direction can be restricted.

(Sixth embodiment)
Hereinafter, a sixth embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS. 10 and 11. Note that the case 11, the electrode assembly 12, the positive electrode conductive member 17, and the negative electrode conductive member 18 have the same configurations as those in the first embodiment, and thus description thereof is omitted. Further, only the configuration different from the fifth embodiment will be described for the first insulating cover and the second insulating cover.

  As shown in FIG. 10, the secondary battery 10 of the present embodiment does not include the third insulating cover 60c. Further, the positive electrode terminal structure 15 and the negative electrode terminal structure 16 of the present embodiment do not include the inner insulating member 55.

  The first insulating cover 60f of the present embodiment includes a fourth insulating portion 67 as a lid-shaped insulating portion having a rectangular plate shape facing the third insulating portion 63a and the extending portion 64 in the height direction. The edge part of the 4th insulation part 67 continues with each upper end part of the 1st insulation part 61a, the 2nd insulation part 62a, and the 1st-3rd wall parts 65a-65c. The longitudinal direction of the fourth insulating portion 67 coincides with the width direction. The dimension in the longitudinal direction of the fourth insulating portion 67 of the present embodiment is substantially the same as the dimension in the longitudinal direction of the negative electrode conductive member 18. The fourth insulating portion 67 includes an insertion groove 67a that is recessed from the edge opposite to the third wall portion 65c in the width direction toward the third wall portion 65c. The shaft portion 51b of the lead terminal 51 is inserted into the insertion groove 67a. The shaft portion 51b is inserted into the insertion groove 67a so as to penetrate the fourth insulating portion 67 in the thickness direction.

  As shown in FIG. 11, the fourth insulating portion 67 is disposed between the upper end surface 18 b of the negative electrode conductive member 18 and the inner surface 14 a of the lid 14 and insulates the negative electrode conductive member 18 and the lid 14. That is, the fourth insulating portion 67 is a member that replaces the inner insulating member 55 in the first to fifth embodiments. The seal ring 56 is disposed between the inner side of the insertion groove 67 a of the fourth insulating portion 67 and the shaft portion 51 b of the lead terminal 51.

  The second insulating cover 60g of the present embodiment includes a fourth insulating portion 67 as a lid-side insulating portion having a rectangular plate shape facing the third insulating portion 63a and the extending portion 64 in the height direction. The edge part of the 4th insulation part 67 continues with each upper end part of the 1st insulation part 61b, the 2nd insulation part 62b, and the 1st-3rd wall parts 65a-65c. The longitudinal direction of the fourth insulating portion 67 coincides with the width direction. The dimension in the longitudinal direction of the fourth insulating portion 67 of the present embodiment is substantially the same as the dimension in the longitudinal direction of the positive electrode conductive member 17.

  The fourth insulating portion 67 includes an insertion groove 67a that is recessed from the edge opposite to the third wall portion 65c in the width direction toward the third wall portion 65c. The shaft portion 51b of the lead terminal 51 is inserted into the insertion groove 67a. The shaft portion 51b is inserted into the insertion groove 67a so as to penetrate the fourth insulating portion 67 in the thickness direction. The fourth insulating portion 67 is disposed between the upper end surface 17 b of the positive electrode conductive member 17 and the inner surface 14 a of the lid 14 and insulates the positive electrode conductive member 17 and the lid 14. That is, the fourth insulating portion 67 is a member that replaces the inner insulating member 55 in the first to fifth embodiments. The seal ring 56 is disposed between the inner side of the insertion groove 67 a of the fourth insulating portion 67 and the shaft portion 51 b of the lead terminal 51.

Next, a process of attaching the first insulating cover 60f and the second insulating cover 60g, which is a part of the manufacturing process of the secondary battery 10, will be described.
First, the positive electrode tab group 25a of the electrode assembly 12 and the positive electrode conductive member 17 are joined, and the negative electrode tab group 28a and the negative electrode conductive member 18 are joined. Further, the positive electrode conductive member 17 and the joint portion 51 a of the positive lead terminal 51 are joined, and the negative electrode conductive member 18 and the joint portion 51 a of the negative lead terminal 51 are joined.

  Next, the first insulating cover 60 f is attached to the negative electrode conductive member 18, and the second insulating cover 60 g is attached to the positive electrode conductive member 17. The first insulating cover 60 f is slid toward the negative electrode conductive member 18. That is, the negative electrode conductive member 18 is accommodated in a space surrounded by the first to fourth insulating portions 61a to 63a and 67, the extending portion 64, and the first to third wall portions 65a to 65c of the first insulating cover 60f. To do.

  The negative electrode conductive member 18 is inserted between the first insulating portion 61a and the second insulating portion 62a and between the first wall portion 65a and the second wall portion 65b. The proximal-side bent portion 29a of the negative electrode tab group 28a is inserted into the gap between the first insulating portion 61a and the first edge portion 64a of the extending portion 64, and the excess portion 29d of the negative electrode tab group 28a and the electrode assembly 12 An extending portion 64 is inserted between the tab side end surface 12a. A third insulating portion 63 a is inserted between the lower end surface 18 a of the negative electrode conductive member 18 and the tab side end surface 12 a of the electrode assembly 12. The shaft portion 51 b of the lead terminal 51 is inserted into the insertion groove 67 a of the fourth insulating portion 67, and the fourth insulating portion 67 is inserted between the upper end surface 18 b of the negative electrode conductive member 18 and the inner surface 14 a of the lid 14. Is done. The second insulating cover 60g is attached to the positive electrode conductive member 17 in the same manner.

  Next, the positive terminal structure 15 and the negative terminal structure 16 are assembled to the lid 14. Seal rings 56 are interposed between the upper end surface 17 b of the positive electrode conductive member 17 and the inner surface 14 a of the lid 14, and between the upper end surface 18 b of the negative electrode conductive member 18 and the inner surface 14 a of the lid 14. Next, the tip of the shaft portion 51 b of each extraction terminal 51 is caulked, and the seal ring 56 is brought into close contact with the periphery of the insertion hole of the lid 14. As a result, the electrode assembly 12 and the lid 14 are integrated, and the proximal-side bent portion 29a, the extended portion 29b, and the distal-end-side bent portion 29c are formed in the positive electrode tab group 25a and the negative electrode tab group 28a. .

  Thereafter, the electrode assembly 12 is accommodated in the case main body 13. When the electrode assembly 12 is accommodated in the case main body 13, the first insulating portion 61 a of the first insulating cover 60 f is between the proximal-side bent portion 29 a of the negative electrode tab group 28 a and the inner surface 31 a of the case main body 13. The second insulating portion 62a is located between the distal end side bent portion 29c of the negative electrode tab group 28a and the inner surface 31a of the case body 13. Similarly, the first insulating portion 61b of the second insulating cover 60g is located between the proximal end side bent portion 29a of the positive electrode tab group 25a and the inner surface 31a of the case body 13, and the second insulating portion 62b is connected to the positive electrode It is located between the distal end side bent portion 29c of the tab group 25a and the inner surface 31a of the case body 13.

  The first wall portion 65a of the first insulating cover 60f is located between the one end portion 18c in the stacking direction of the negative electrode conductive member 18 and the inner surface 31a of the case body 13, and the second wall portion 65b is negative electrode conductive. The third wall 65c is located between the other end 18d in the stacking direction of the member 18 and the inner surface 31a of the case body 13, and the third wall 65c is formed between the end 18e of the negative electrode conductive member 18 and the inner surface 32a of the case body 13. Located between. Similarly, the first wall portion 65a of the second insulating cover 60g is located between the one end portion 17c in the stacking direction of the positive electrode conductive member 17 and the inner surface 31a of the case body 13, and the second wall portion 65b is The third wall 65c is located between the other end portion 17d of the conductive member 17 in the stacking direction and the inner surface 31a of the case body 13, and the third wall portion 65c is connected to the end portion 17e of the positive electrode conductive member 17 and the inner surface 32a of the case body 13. Located between.

In the sixth embodiment, in addition to the effects (1) and (3) of the first embodiment and the effects (7) to (9) of the fifth embodiment, the following effects are obtained. be able to.
(12) The upper end surface 18b of the negative electrode conductive member 18 and the inner surface 14a of the lid 14 can be insulated by the fourth insulating portion 67 of the first insulating cover 60f. Similarly, the upper end surface 17b of the positive electrode conductive member 17 and the inner surface 14a of the lid 14 can be insulated by the fourth insulating portion 67 of the second insulating cover 60g. Therefore, the third insulating cover 60c and the inner insulating member 55 provided in the first to fifth embodiments can be omitted. Therefore, the positive electrode conductive member 17 and the negative electrode conductive member 18 and the lid 14 can be insulated without increasing the number of parts of the secondary battery 10.

In addition, you may change the 1st-6th embodiment as follows.
In the first to sixth embodiments, in the positive electrode 20, the positive electrode active material layer 24 may exist on one side of the positive electrode metal foil 23. Similarly, in the negative electrode 21, the negative electrode active material layer 27 may exist on one side of the negative electrode metal foil 26.

  In the first to fourth embodiments, the positive electrode tab group 25a and the negative electrode tab group 28a may not include the distal end side bent portion 29c but may include only the proximal end side bent portion 29a and the extended portion 29b. In this case, the other end of the ends of the positive electrode tab group 25a and the negative electrode tab group 28a in the stacking direction of the positive electrode 20 and the negative electrode 21 is the tip of the extending portion 29b.

  In the first to sixth embodiments, the positive electrode terminal structure 15 and the negative electrode terminal structure 16 may be other than the structure using the extraction terminal 51, the terminal connection member 52, and the external connection terminal 53. It may be directly connected to the member 17 (negative electrode conductive member 18).

In the first embodiment, the third insulating cover 60c may be omitted.
In the first embodiment, the third insulating portion 63a of the first insulating cover 60a may not have a function of insulating the negative electrode conductive member 18 and the electrode assembly 12. Similarly, the third insulating portion 63b of the second insulating cover 60b may not have a function of insulating the positive electrode conductive member 17 and the electrode assembly 12. In this case, the third insulating portions 63a and 63b have only a function as a connecting member that connects the first insulating portions 61a and 61b and the second insulating portions 62a and 62b.

  In the first embodiment, the upper end surfaces A1 and A2 of the first and second insulating portions 61a and 62a may be located above the lower end surface 18a of the negative electrode conductive member 18 on the electrode assembly 12 side. The lower end surfaces B1 and B2 of the first and second insulating portions 61a and 62a may be positioned below the tab side end surface 12a of the electrode assembly 12.

  In the second embodiment, each third insulating portion 73 may not have a function of insulating the positive electrode conductive member 17 (negative electrode conductive member 18) and the lid 14. In this case, each third insulating portion 73 has only a function as a connecting member that connects the first insulating portion 71 and the second insulating portion 72.

In the second embodiment, the lower end surfaces 71 a and 72 a of the first and second insulating portions 71 and 72 may be positioned below the tab side end surface 12 a of the electrode assembly 12.
In the second embodiment, an insulating cover that insulates the positive electrode conductive member 17 and the electrode assembly 12 may be added in addition to the first and second insulating covers 70a and 70b. Similarly, an insulating cover for insulating the negative electrode conductive member 18 and the electrode assembly 12 may be added.

  In the third embodiment, the first insulating cover 80a is to insulate the negative electrode conductive member 18 and the electrode assembly 12, and the first and second insulating portions 81 and 82 are the second insulating cover 80b. May be formed.

  In the fourth embodiment, in addition to the first and second insulating covers 90a and 90b, an insulating cover for insulating the positive electrode conductive member 17 and the electrode assembly 12 may be added. Similarly, an insulating cover for insulating the negative electrode conductive member 18 and the electrode assembly 12 may be added.

  In the fourth embodiment, in addition to the first and second insulating covers 90a and 90b, an insulating member that insulates the positive electrode conductive member 17 and the negative electrode conductive member 18 from the lid 14 (for example, the first embodiment) A third insulating cover 60c) may be added.

  In the fifth embodiment, the concave portions 171 and 181 of the positive electrode conductive member 17 and the negative electrode conductive member 18 may be omitted. In this case, the protrusion 66 of the first insulating cover 60d is supported by the upper end surface 18b of the negative electrode conductive member 18, for example. Similarly, the protrusion 66 of the second insulating cover 60e is supported on the upper end surface 17b of the positive electrode conductive member 17, for example.

  Further, the first insulating cover 60d may be configured such that the end portion on the inner insulating member 55 side in the width direction of the protrusion 66 faces the end portion on the negative electrode tab group 28a side in the inner insulating member 55. In this case, when the first insulating cover 60 d tries to move outward in the width direction, the protrusion 66 contacts the end of the inner insulating member 55. Thereby, the movement to the outer side of the width direction of the 1st insulating cover 60d can be controlled. Similarly, the second insulating cover 60e may be configured such that the end portion on the inner insulating member 55 side in the width direction of the protrusion 66 faces the end portion on the positive electrode tab group 25a side in the inner insulating member 55. In this case, when the second insulating cover 60 e tries to move outward in the width direction, the protrusion 66 contacts the end portion of the inner insulating member 55. Thereby, the movement to the outer side of the width direction of the 2nd insulating cover 60e can be controlled.

  In the fifth embodiment, instead of the recesses 171 and 181 of the positive electrode conductive member 17 and the negative electrode conductive member 18, recesses may be formed at one end and the other end in the stacking direction of each inner insulating member 55.

  In the fifth and sixth embodiments, only the intersection R located at the first edge 64a may be rounded, or only the intersection R located at the second edge 64b may be a corner. The shape taken may be sufficient.

  In the sixth embodiment, the longitudinal dimension of the fourth insulating portion 67 of the first insulating cover 60 f may be shorter than the longitudinal dimension of the negative electrode conductive member 18. However, for the portion where the fourth insulating portion 67 is not disposed between the inner surface 14a of the lid 14 and the upper end surface 18b of the negative electrode conductive member 18, for example, the lid 14 and the negative electrode conductive member 18 are separated by a sufficient distance. Shall be insulated. Similarly, the longitudinal dimension of the fourth insulating portion 67 of the second insulating cover 60g may be shorter than the longitudinal dimension of the positive electrode conductive member 17. However, for the portion where the fourth insulating portion 67 is not disposed between the inner surface 14a of the lid 14 and the upper end surface 17b of the positive electrode conductive member 17, for example, the lid 14 and the positive electrode conductive member 17 are separated by a sufficient distance. Shall be insulated.

  In the attachment process of 1st Embodiment, you may change suitably the order which attaches the 1st-3rd insulation covers 60a-60c. For example, after attaching the first and second insulating covers 60a and 60b, the electrode assembly 12 and the lid 14 may be integrated via the third insulating cover 60c.

  In the sixth embodiment, after assembling the lid 14, the positive terminal structure 15, the negative terminal structure 16, the positive conductive member 17, the negative conductive member 18, the first insulating cover 60f, and the second insulating cover 60g. Alternatively, the positive electrode conductive member 17 and the positive electrode tab group 25a may be joined, and the negative electrode conductive member 18 and the negative electrode tab group 28a may be joined. In this case, the extending part 64 may be omitted.

The power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors.
The secondary battery 10 may be a secondary battery other than the lithium ion secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material and the negative electrode active material and the charge is taught.

Hereinafter, technical ideas that can be grasped from the second embodiment and the third embodiment will be described.
(A) a first insulating part that insulates one end of the tab group of the positive electrode and the inner surface of the case body; a first insulating part that insulates one end of the tab group of the negative electrode and the inner surface of the case body; Is integrated and insulates the other end of the tab group of the positive electrode and the inner surface of the case body, and the other end of the tab group of the negative electrode and the inner surface of the case body A power storage device integrated with the second insulating portion.

  (B) A pair of conductive members joined to the tab group of the same polarity, disposed between the lid and the inner surface of the lid, and between the tab side end surface of the electrode assembly where the tab group exists. A dimension of the first insulating part in the width direction and a dimension of the second insulating part are shorter than the distance between the conductive members in the width direction, and the tab side end surface from between the conductive members And the lid, the insulating member is disposed, and then the insulating member is slid in the width direction.

DESCRIPTION OF SYMBOLS 10 ... Secondary battery as a power storage device, 11 ... Case, 12 ... Electrode assembly, 12a ... End surface on the tab side, 13 ... Case body, 13a ... Opening, 31a ... Inner surface, 32a ... Inner surface, 14 ... Lid, 14a ... Inner surface, 17 ... positive electrode conductive member as a conductive member, 17c ... one end, 17d ... the other end, 18 ... negative electrode conductive member as a conductive member, 18c ... one end, 18d ... the other end, 20 ... positive electrode as an electrode Electrode, 20a ... Tab side edge as one side, 21 ... Negative electrode as electrode, 21a ... Tab side edge as one side, 25 ... Positive electrode tab as tab, 25a ... Positive electrode tab group as tab group, 28 ... Negative electrode tab as a tab, 28a ... Negative electrode tab group as a tab group, 29a ... Base end side bent portion as one end portion, 29c ... Tip side bent portion as the other end portion, 29d ... Surplus portion, 60, 70, 80 , 90 ... Insulation Insulating cover as material, 61a, 61b, 71, 81, 91 ... first insulating portion, 62a, 62b, 72, 82, 92 ... second insulating portion, 63a, 63b, 73, 83 ... third as connecting portion Insulating part, 64 ... extension part, 64a ... first edge part as an edge part, 64b ... second edge part as an edge part, 65a ... first wall part as an insulating wall part, 65b ... as an insulating wall part 2nd wall part, 65c ... 3rd wall part as an insulation wall part, 66 ... Projection part, 67 ... 4th insulation part as a lid side insulation part, 93 ... Connection part, 171, 181 ... Recessed part, C61a, C61b, C62a, C62b, C71, C72, C81, C82, C91, C92... Inner surfaces as opposing surfaces, S60a, S60b, S70a, S70b, S80a, S90a, S90b.

Claims (10)

An electrode assembly having a tab group in which a plurality of positive and negative electrodes are stacked in an insulated state and tabs protruding from a part of one side of the electrode are stacked with the same polarity, and the electrode assembly is accommodated A case main body, and a case having a lid for closing the opening of the case main body,
With
At least one of one end and the other end of the tab group in the electrode stacking direction is a power storage device configured to be bent,
A first insulating portion disposed between one end of the tab group and the inner surface of the case body, and insulating the one end portion of the tab group and the inner surface of the case body; the other end portion of the tab group; A second insulating portion disposed between the inner surface of the case body and insulating the other end of the tab group and the inner surface of the case body; and the first insulating portion and the second insulating portion in the stacking direction. An insulating member having a connecting portion connected to the space, and a space sandwiched between opposing surfaces of the first insulating portion and the second insulating portion in the stacking direction,
When the direction along one side of the electrode is a width direction, the space is open to at least one side of the width direction. A pair of conductive members that are joined to the tab group of the same polarity, disposed between the lid, the inner surface of the lid, and the tab side end surface of the electrode assembly on which the tab group exists; ,
The power storage device according to claim 1, wherein the connecting portion is located between the conductive member and a tab side end surface of the electrode assembly, and insulates the conductive member and the electrode assembly. The one end of the tab group is a base end side bent portion where a base end side portion of the tab group is bent,
The other end portion of the tab group is a distal end side bent portion where a distal end side portion of the tab group is bent,
The tab group has a surplus portion extending from the distal end side bent portion toward the proximal end side bent portion,
The insulating member has an extending portion extending from the connecting portion along the width direction toward the tab group,
The power storage device according to claim 2, wherein the extending portion covers an excess portion of the tab group from the electrode assembly side.   The insulating member is erected on the lid side from the edge of the connecting portion, and is disposed between the conductive member and the inner surface of the case main body to insulate the conductive member from the inner surface of the case main body. The power storage device according to claim 2 or 3, comprising an insulating wall portion. The extending portion has an intersection formed by intersecting a side surface and an upper surface facing the tab group at an edge along the width direction and an edge along the stacking direction,
4. At least one of the intersecting portion located at the edge along the width direction and the intersecting portion located at the edge along the stacking direction has a chamfered shape. The power storage device according to claim 4. The insulating wall includes a first wall disposed between one end of the conductive member in the stacking direction and an inner surface of the case main body, the other end of the conductive member in the stacking direction, and the case main body. A second wall portion disposed between the inner surface and
The first wall portion has a protrusion protruding toward the second wall portion,
The second wall portion has a protrusion protruding toward the first wall portion,
The power storage device according to claim 4, wherein the protrusion is supported by the conductive member. The conductive member includes a recess at one end and the other end in the stacking direction, and the recess has a pair of inner surfaces facing the width direction,
The protrusion of the first wall is housed in a recess at one end of the conductive member in the stacking direction, and the protrusion of the second wall is housed in a recess at the other end of the conductive member in the stacking direction. The power storage device according to claim 6.   The said insulating member is located between the said electrically-conductive member and the inner surface of the said lid | cover, and is provided with the lid side insulating part which insulates the said electrically-conductive member and the said lid | cover. Power storage device. A pair of conductive members that are joined to the tab group of the same polarity, disposed between the lid, the inner surface of the lid, and the tab side end surface of the electrode assembly on which the tab group exists; ,
The power storage device according to claim 1, wherein the connecting portion is located between the conductive member and an inner surface of the lid, and insulates the conductive member and the lid. An electrode assembly having a tab group in which a plurality of positive and negative electrodes are stacked in an insulated state and tabs protruding from a part of one side of the electrode are stacked with the same polarity, and the electrode assembly is accommodated A case main body, and a case having a lid for closing the opening of the case main body, and at least one of the one end and the other end of the tab group in the electrode stacking direction is bent. A method of manufacturing a power storage device comprising:
When the direction along one side of the electrode is the width direction,
A first insulating portion that insulates one end of the tab group from the inner surface of the case main body, a second insulating portion that insulates the other end of the tab group and the inner surface of the case main body, and the first insulating portion. An insulating member comprising: a connecting portion that connects the second insulating portion and the second insulating portion in the stacking direction; and a space sandwiched between opposing surfaces of the first insulating portion and the second insulating portion in the stacking direction, The space is opened at least on one side in the width direction, the insulating member is slid in the width direction, the first insulating portion covers one end of the tab group, and the second insulating portion A method for manufacturing a power storage device, comprising covering the other end of the tab group.