JP6432952B1 - Electrochemical cell - Google Patents

Abstract

A highly reliable electrochemical cell is provided. A battery 1 includes an electrode body 10 wound around a winding axis P in a state where a positive electrode body 11 and a negative electrode body 12 are laminated, an exterior body 20 containing the electrode body 10 and an electrolyte, an electrode A positive electrode lead 13 and a negative electrode lead 14 connected to the body 10 and extending from the first end portion 10a in the axial direction of the winding axis P of the electrode body 10, and a first end portion 10a of the electrode body 10 and the positive electrode lead 13 and And an insulating member 40 interposed between the negative electrode lead 14. [Selection] Figure 2

Description

  The present invention relates to an electrochemical cell.

  Electrochemical cells such as non-aqueous electrolyte secondary batteries and electric double layer capacitors are used as power sources for various devices. As one form of the electrochemical cell, for example, a battery as in Patent Document 1 below has been proposed. The battery described in Patent Document 1 includes a power generation element, a battery container that houses the power generation element, a non-aqueous electrolyte filled in the battery container, and a lead terminal that allows the power generation element to communicate with an external circuit. Is formed by stacking a positive electrode plate, a negative electrode plate, and a separator in order and winding them in an elliptical spiral shape.

JP 2000-182574 A

  By the way, in the said electrochemical cell of the prior art, a lead terminal may contact with the edge part of an electric power generation element inside a battery container. In this case, the lead connected to the positive electrode plate may contact the negative electrode plate, or the lead connected to the negative electrode plate may contact the positive electrode plate, thereby causing a short circuit inside the battery container. Thereby, there exists a subject that the reliability of an electrochemical cell falls.

  Therefore, the present invention provides a highly reliable electrochemical cell.

The electrochemical cell of the present invention is connected to the electrode body, an electrode body wound around a predetermined axis in a state where the positive electrode body and the negative electrode body are laminated, the electrode body and the electrolyte, A lead extending from an axial end of the predetermined axis of the electrode body; and an insulating member interposed between the end of the electrode body and the lead . A member and a second member are formed to overlap each other, and the exterior body sandwiches the electrode body between the first member and the second member, and a housing portion that houses the electrode body, and a periphery of the housing portion A peripheral portion that is formed by overlapping the first member and the second member and seals the inside of the accommodating portion, and the peripheral portion is bent along the outer surface of the accommodating portion. It is characterized by that.
The electrochemical cell of the present invention is formed by a laminate film including an electrode body wound around a predetermined axis in a state where a positive electrode body and a negative electrode body are laminated, and a resin layer covering the metal layer and the metal layer, An exterior body containing the electrode body and an electrolyte; a lead connected to the electrode body and extending from an axial end of the predetermined axis of the electrode body; the end of the electrode body and the lead; An insulating member interposed between the insulating members, wherein the insulating member has liquid retention.
The electrochemical cell of the present invention is formed by a laminate film including an electrode body wound around a predetermined axis in a state where a positive electrode body and a negative electrode body are laminated, and a resin layer covering the metal layer and the metal layer, An exterior body containing the electrode body and an electrolyte; a lead connected to the electrode body and extending from an axial end of the predetermined axis of the electrode body; the end of the electrode body and the lead; An insulating member interposed between the insulating member and the insulating member, wherein the insulating member has a cushioning property.
In the above electrochemical cell, the exterior body is formed by overlapping the first member and the second member formed of the laminate film, and the exterior body is formed by the first member and the second member. It is desirable that a housing portion for housing the electrode body is provided with the electrode body interposed therebetween, and the housing portion is formed in a cylindrical shape in which both ends in the axial direction are closed.

According to the present invention, it is possible to suppress the lead from coming into contact with the end portion of the electrode body and conducting by the insulating member. Therefore, it is possible to suppress the positive electrode body from coming into contact with the reverse polarity lead at the end of the electrode body and short-circuiting, and the negative electrode body from coming into contact with the reverse polarity lead at the end of the electrode body and short-circuiting. Therefore, a highly reliable electrochemical cell can be provided.
Furthermore, in the configuration in which the peripheral edge portion is bent so as to follow the outer surface of the housing portion as in the present invention, when the peripheral portion is bent, a force is applied to the housing portion, and the housing portion may be deformed to be squeezed. . Thereby, the electrode body accommodated in the accommodating part is pressed, and the positive electrode body and the negative electrode body are easily displaced from each other in the axial direction. According to the present invention, since the insulating member is interposed between the end portion of the electrode body and the lead, as described above, the positive electrode body contacts the lead of opposite polarity at the end portion of the electrode body and short-circuits, And it can suppress that a negative electrode body contacts the lead of reverse polarity in the edge part of an electrode body, and short-circuits. Therefore, it is possible to provide a highly reliable electrochemical cell that is miniaturized by bending the peripheral edge.

  In the above electrochemical cell, it is desirable that the insulating member has a liquid retaining property.

  In the present invention, since the electrode body is wound around a predetermined axis, an interlayer between the positive electrode body and the negative electrode body is opened in the axial direction at an end portion in the axial direction. Since the insulating member is disposed between the end of the electrode body and the lead and has a liquid retaining property, the electrolysis is performed in a state in which an electrolyte can be supplied from the end of the electrode body to the interlayer between the positive electrode body and the negative electrode body. Can hold liquid. Therefore, it is possible to suppress the shortage of the electrolytic solution inside the electrode body, and it is possible to stabilize the characteristics of the electrochemical cell.

  In the above electrochemical cell, the insulating member preferably has a cushioning property.

  According to the present invention, since the insulating member has cushioning properties, the insulating member and the end portion of the electrode body are formed by the insulating member even if the end portion of the electrode body has unevenness due to the laminated structure of the positive electrode body and the negative electrode body. Can be filled. Thereby, when the exterior body is formed of a flexible member, it is possible to prevent the exterior body from being deformed due to an internal negative pressure after deaeration during manufacture of the electrochemical cell. Moreover, it can suppress that the member (for example, positive electrode body, negative electrode body, lead, etc.) which contacts an insulating member is damaged.

  In the above electrochemical cell, it is preferable that an insertion portion through which the lead is inserted is formed in the insulating member.

  According to the present invention, the insulating member is formed with a through hole through which the lead is inserted. Thereby, since the movement of the insulating member with respect to the lead can be restricted, the displacement of the insulating member with respect to the lead and the electrode body can be suppressed. Therefore, it can suppress more reliably that a lead contacts the edge part of an electrode body.

  In the above electrochemical cell, it is desirable that the insulating member is formed so that an outer edge is provided outside the positive electrode body and the negative electrode body with respect to the predetermined axis when viewed from the axial direction.

  According to the present invention, the positive electrode body and the negative electrode body can be covered with the insulating member at the outermost peripheral portion of the electrode body in which the positive electrode body and the negative electrode body are easily displaced from each other in the axial direction. Therefore, it can suppress more reliably that a lead contacts the edge part of an electrode body.

  In the electrochemical cell, the exterior body is formed by overlapping a first member and a second member, and the exterior body sandwiches the electrode body between the first member and the second member, and the electrode And a peripheral portion that is formed by overlapping the first member and the second member around the storage portion and seals the inside of the storage portion. Is preferably bent along the outer surface of the housing portion.

  As in the present invention, in a configuration in which the peripheral edge portion is bent along the outer surface of the housing portion, a force is applied to the housing portion when the peripheral edge portion is bent, and the housing portion may be deformed to be squeezed. Thereby, the electrode body accommodated in the accommodating part is pressed, and the positive electrode body and the negative electrode body are easily displaced from each other in the axial direction. According to the present invention, since the insulating member is interposed between the end portion of the electrode body and the lead, as described above, the positive electrode body contacts the lead of opposite polarity at the end portion of the electrode body and short-circuits, And it can suppress that a negative electrode body contacts the lead of reverse polarity in the edge part of an electrode body, and short-circuits. Therefore, it is possible to provide a highly reliable electrochemical cell that is miniaturized by bending the peripheral edge.

  According to the present invention, a highly reliable electrochemical cell can be provided.

It is a perspective view of the battery which concerns on embodiment. It is a disassembled perspective view of the battery which concerns on embodiment. It is a longitudinal cross-sectional view of the battery which concerns on embodiment. It is a perspective view of the battery which concerns on the 1st modification of embodiment. It is a longitudinal cross-sectional view of the battery which concerns on the 2nd modification of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. And the description which overlaps those structures may be abbreviate | omitted. In the following description, as an electrochemical cell, a lithium ion secondary battery (hereinafter simply referred to as “battery”), which is a kind of nonaqueous electrolyte secondary battery, will be described as an example.

FIG. 1 is a perspective view of a battery according to an embodiment. FIG. 2 is an exploded perspective view of the battery according to the embodiment.
As shown in FIGS. 1 and 2, the battery 1 is a so-called small cylindrical battery. The battery 1 includes an electrode body 10 including a positive electrode body 11 and a negative electrode body 12, an exterior body 20 in which the electrode body 10 and an electrolytic solution (electrolyte) are accommodated, and leads 13 and 14 (positive electrode leads) extending from the electrode body 10. 13 and the negative electrode lead 14), and an insulating member 40 disposed between the electrode body 10 and the leads 13, 14.

  As shown in FIG. 2, the electrode body 10 is formed in a cylindrical shape. The electrode body 10 has a structure in which a strip-like positive electrode body 11 and a negative electrode body 12 are wound around a winding axis P (predetermined axis) in a state where the strip body is laminated with a separator 15 interposed therebetween. That is, the separator 15 is disposed between the positive electrode body 11 and the negative electrode body 12 and insulates the positive electrode body 11 from the negative electrode body 12. A separator 15 is disposed on the outermost peripheral portion of the electrode body 10. In the example shown in FIG. 2, the positive electrode body 11 and the negative electrode body 12 are exposed on the outer peripheral surface of the electrode body 10 in order to explain the laminated structure of the electrode body 10. It is desirable that the separator 15 is disposed over the entire circumference. The electrode body 10 includes a first end portion 10a located on one side in the axial direction of the winding axis P and a second end portion 10b located on the opposite side to the first end portion 10a in the axial direction of the winding axis P. And have. In the following description, the axial direction of the winding axis P is simply referred to as the axial direction, the direction that rotates around the winding axis P is referred to as the circumferential direction, and the direction orthogonal to the axial direction is referred to as the radial direction.

  The positive electrode body 11 includes a positive electrode current collector foil formed of a metal material, and a positive electrode active material coated on the positive electrode current collector foil. The positive electrode current collector foil is formed of a metal foil such as aluminum or stainless steel. The positive electrode active material is a composite oxide containing lithium and a transition metal, such as lithium cobaltate, lithium titanate, lithium manganate, and the like.

  The negative electrode body 12 includes a negative electrode current collector foil formed of a metal material, and a negative electrode active material coated on the negative electrode current collector foil. The negative electrode current collector foil is formed of a metal foil such as copper or stainless steel. Examples of the negative electrode active material include silicon oxide, graphite, hard carbon, lithium titanate, and LiAl. In the axial direction, the dimensions of the negative electrode body 12 are larger than the dimensions of the positive electrode body 11. For example, the negative electrode body 12 is disposed such that the side edges on both sides in the axial direction are located on the outer side in the axial direction than the positive electrode body 11.

  The separator 15 is formed of, for example, a polyolefin resin porous film, a glass nonwoven fabric, a resin nonwoven fabric, a laminate of cellulose fibers, or the like having a property of allowing lithium ions to pass through. In the axial direction, the dimension of the separator 15 is larger than the dimension of the negative electrode body 12. For example, the separator 15 is arranged so that the side edges on both sides in the axial direction are located on the outer side in the axial direction with respect to the positive electrode body 11 and the negative electrode body 12. Thereby, the separator 15 has suppressed contact with the positive electrode body 11 and the negative electrode body 12 in the whole area of an axial direction.

  As shown in FIGS. 1 and 2, the exterior body 20 is formed by overlapping a first sheet 21 (first member) and a second sheet 22 (second member). The exterior body 20 includes a housing portion 23 that houses the electrode body 10, and a peripheral edge portion 24 that is provided around the housing portion 23. The accommodating portion 23 sandwiches the electrode body 10 between the first sheet 21 and the second sheet 22 and covers the entire electrode body 10. The peripheral edge 24 is formed by overlapping the first sheet 21 and the second sheet 22 around the accommodation part 23. The peripheral edge portion 24 seals the inside of the accommodating portion 23. The first sheet 21 and the second sheet 22 are joined at the peripheral edge 24 by, for example, heat sealing.

  The first sheet 21 and the second sheet 22 are each formed of a flexible laminate film. The laminate film includes a metal layer (metal foil), a resin fusion layer provided on the overlapping surface (inner side) and covering the metal foil, and a resin protective layer provided on the outer side and covering the metal foil. And having. The metal layer is formed using a metal material that blocks outside air and water vapor, such as stainless steel and aluminum. The fused layer on the overlapping surface is formed using a thermoplastic resin such as polyolefin polyethylene or polypropylene, for example. The protective layer on the outer surface is formed using, for example, the above-described polyolefin, polyester such as polyethylene terephthalate, nylon, or the like.

  As shown in FIG. 2, the first sheet 21 includes a first case 25 formed in a bottomed cylindrical shape, and a first case 25 that projects from the opening edge of the first case 25 toward the radially outer side of the first case 25. 1 flange portion 26 is formed. The first sheet 21 is formed such that the fused layer of the laminate film is located on the inner surface of the first case 25. The inner diameter of the first case 25 is larger than the outer diameter of the electrode body 10.

  The second sheet 22 is formed in a bottomed cylindrical shape and opens toward the first case 25, and projects from the opening edge of the second case 27 toward the radially outer side of the second case 27. A second flange portion 28 is formed. The second sheet 22 is formed so that the fused layer of the laminate film is located on the inner surface of the second case 27. The second case 27 is disposed coaxially with the first case 25 of the first sheet 21. For example, the second case 27 is formed deeper than the first case 25. The inner diameter of the second case 27 is equal to the inner diameter of the first case 25. The shape of the second flange portion 28 substantially matches the shape of the first flange portion 26. The second sheet 22 is joined to the first sheet 21 by, for example, heat fusion or the like so that the second flange portion 28 overlaps the first flange portion 26.

  As shown in FIGS. 1 and 2, the accommodating portion 23 is formed in a cylindrical shape with both axial ends closed by a first case 25 and a second case 27. For example, the outer diameter of the accommodating part 23 is set to about 10 mm, and the dimension of the accommodating part 23 in the axial direction is set to about 6 mm. Inside the housing part 23, the electrode body 10 is arranged in a state where the winding axis P is substantially coincident with the central axis of the housing part 23.

  The peripheral edge portion 24 is formed by overlapping the first flange portion 26 and the second flange portion 28. The peripheral edge portion 24 surrounds the opening edge of the first case 25 and the opening edge of the second case 27 in the housing portion 23 from the outer side in the radial direction over the entire circumference. The peripheral edge 24 protrudes along the radial direction from the accommodating part 23 and extends along the circumferential direction. The peripheral portion 24 includes a pair of lead holding portions 31A and 31B that hold the positive electrode lead 13 and the negative electrode lead 14 between the first sheet 21 and the second sheet 22, and a pair of lead holding portions 31A and 31A in the circumferential direction. And a narrow portion 32 having a narrower radial width than the lead holding portions 31A and 31B. Each of the lead holding portions 31A and 31B is provided at a position facing each other in the radial direction with the accommodating portion 23 interposed therebetween.

  As shown in FIG. 2, the positive electrode lead 13 is formed in a band shape from a metal material such as aluminum, and is drawn from the inside of the exterior body 20 to the outside. The positive electrode lead 13 is attached to the positive electrode current collector foil of the positive electrode body 11 at one end by welding or the like, and is electrically connected to the positive electrode body 11. The positive electrode lead 13 is connected to the end of the positive electrode body 11 on the side close to the winding center of the electrode body 10. In the following description, one end portion of the positive electrode lead 13 attached to the positive electrode body 11 is referred to as a base end side, and a side pulled out of the exterior body 20 is referred to as a distal end side. The positive electrode lead 13 extends from a location near the winding axis P in the first end portion 10a of the electrode body 10 to the side facing the first end portion 10a in the axial direction.

FIG. 3 is a longitudinal sectional view of the battery according to the embodiment.
As shown in FIG. 3, the positive electrode lead 13 is a first electrode extending from the first end portion 10 a of the electrode body 10 toward the bottom wall of the first case 25 of the exterior body 20 in order from the proximal end side to the distal end side. A second portion 13b extending along a direction (radial direction in the present embodiment) intersecting the portion 13a, the bottom wall of the first case 25 and the first end portion 10a of the electrode body 10 in the axial direction; The third portion 13c extending along the axial direction between the peripheral wall of the case 25 and the outer peripheral surface of the electrode body 10, and the peripheral portion 24 of the exterior body 20 passes between the first sheet 21 and the second sheet 22. And a fourth portion 13d that extends.

  The second portion 13 b is bent with respect to the first portion 13 a so that one main surface faces the bottom wall of the first case 25. The second portion 13b is bent with respect to the first portion 13a in the radial direction and in the direction away from the winding axis P.

  The third portion 13 c is bent with respect to the second portion 13 b so that the pair of main surfaces are directed to the peripheral wall of the first case 25 and the outer peripheral surface of the electrode body 10. The third portion 13c is bent with respect to the second portion 13b in a direction away from the bottom wall of the first case 25 in the axial direction.

  The fourth portion 13d is bent with respect to the third portion 13c so that both main surfaces are directed in the axial direction. The fourth portion 13d extends along the radial direction in a direction away from the electrode body 10. The fourth portion 13 d passes between the first sheet 21 and the second sheet 22 in the lead holding portion 31 </ b> A of the exterior body 20 and extends to the outside of the exterior body 20.

  Thus, the positive electrode lead 13 extends from the first end portion 10a of the electrode body 10 to the side where the first end portion 10a in the axial direction faces, and the first end portion 10a of the exterior body 20 and the electrode body 10. Extends in a direction intersecting the axial direction.

  As shown in FIG. 2, the negative electrode lead 14 is formed in a band shape from a metal material such as stainless steel, nickel, or copper, and is drawn out from the inside of the exterior body 20. The negative electrode lead 14 is attached to the negative electrode current collector foil of the negative electrode body 12 at one end by welding or the like, and is electrically connected to the negative electrode body 12. The negative electrode lead 14 is connected to the end of the negative electrode body 12 on the side close to the winding center of the electrode body 10. In the following description, one end portion of the negative electrode lead 14 attached to the negative electrode body 12 is referred to as a proximal end side, and a side pulled out of the exterior body 20 is referred to as a distal end side. The negative electrode lead 14 extends from the side opposite to the positive electrode lead 13 across the winding axis P in the first end 10a of the electrode body 10 to the side where the first end 10a in the axial direction faces.

  As shown in FIG. 3, the negative electrode lead 14 is a first electrode that extends from the first end portion 10 a of the electrode body 10 toward the bottom wall of the first case 25 of the exterior body 20 in order from the proximal end side to the distal end side. A portion 14a, a second portion 14b extending in a direction (radial direction in the present embodiment) intersecting the axial direction between the bottom wall of the first case 25 and the first end 10a of the electrode body 10, and The third portion 14c extending along the axial direction between the peripheral wall of the case 25 and the outer peripheral surface of the electrode body 10 and the first peripheral portion 24 of the exterior body 20 between the first sheet 21 and the second sheet 22 And a fourth portion 14d extending in the direction.

  The second portion 14 b is bent with respect to the first portion 14 a so that one main surface faces the bottom wall of the first case 25. The second portion 14b is bent with respect to the first portion 14a in the radial direction and in the direction away from the winding axis P. The second portion 14b is disposed on the opposite side of the winding lead P with respect to the second portion 13b of the positive electrode lead 13.

  The third portion 14 c is bent with respect to the second portion 14 b so that the pair of main surfaces are directed to the peripheral wall of the first case 25 and the outer peripheral surface of the electrode body 10. The third portion 14c is bent with respect to the second portion 14b in a direction away from the bottom wall of the first case 25 in the axial direction.

  The fourth portion 14d is bent with respect to the third portion 14c so that both main surfaces are directed in the axial direction. The fourth portion 14 d extends along the radial direction in a direction away from the electrode body 10. The fourth portion 14 d passes between the first sheet 21 and the second sheet 22 in the lead holding portion 31 </ b> B of the exterior body 20 and extends to the outside of the exterior body 20.

  Thus, the negative electrode lead 14 extends from the first end portion 10a of the electrode body 10 to the side where the first end portion 10a in the axial direction faces, and the first end portion 10a of the exterior body 20 and the electrode body 10. Extends in a direction intersecting the axial direction.

  The sealant film 17 is interposed between the first flange portion 26 and the second flange portion 28 and the leads 13 and 14, respectively. The sealant film 17 is a film material made of a thermoplastic resin such as polyolefin, polyethylene, or polypropylene. The sealant film 17 sandwiches the leads 13 and 14 from both sides in the thickness direction by the pair of film materials. The sealant film 17 is welded and fixed to the first sheet 21 and the second sheet 22.

  The insulating member 40 is interposed between the first end portion 10 a of the electrode body 10 and the positive electrode lead 13 and the negative electrode lead 14. The insulating member 40 is a member formed in a plate shape or a sheet shape, for example. The insulating member 40 is made of a material having electrical insulation and insolubility with respect to the electrolytic solution. For example, the insulating member 40 is formed of a material that can be used as the separator 15. The insulating member 40 has liquid retention and cushioning properties. The cushioning property is a property that can be deformed following the shape of another object that comes into contact. The insulating member 40 is formed of, for example, a resin nonwoven fabric such as polyolefin, a glass nonwoven fabric, or the like.

  As shown in FIG. 2, the insulating member 40 overlaps the first end portion 10 a of the electrode body 10, the second portion 13 b of the positive electrode lead 13, and the second portion 14 b of the negative electrode lead 14 as viewed from the axial direction. It is provided as follows. In the present embodiment, the insulating member 40 is formed in a disc shape having a through hole 41 (insertion portion) formed in the center. The insulating member 40 is disposed coaxially with the electrode body 10. The first portion 13 a of the positive electrode lead 13 and the first portion 14 a of the negative electrode lead 14 are inserted into the through hole 41. The outer peripheral edge (outer edge) of the insulating member 40 is provided on the outer side in the radial direction with respect to the winding axis P than the positive electrode body 11 and the negative electrode body 12 when viewed from the axial direction. That is, the outer peripheral edge of the insulating member 40 is provided at a position farther from the winding axis P than the outermost peripheral portions of the positive electrode body 11 and the negative electrode body 12 or at the same position. The insulating member 40 covers substantially the entire first end portion 10 a of the electrode body 10. The outer diameter of the insulating member 40 substantially matches the outer diameter of the electrode body 10.

As described above, in this embodiment, the insulating member 40 is interposed between the first end portion 10 a of the electrode body 10 and the positive electrode lead 13 and the negative electrode lead 14.
When the electrode body 10 is formed by winding in a state where the positive electrode body 11, the negative electrode body 12 and the separator 15 are laminated, the positive electrode body 11 and the negative electrode body 12 move from the winding center of the electrode body 10 toward the outer periphery. In addition, the separators 15 are easily displaced from each other in the axial direction. Thereby, at the end of the electrode body 10 in the axial direction (for example, the first end 10 a), at least one of the positive electrode body 11 and the negative electrode body 12 may protrude in the axial direction from the separator 15.
According to the present embodiment, the insulating member 40 can prevent at least one of the positive electrode lead 13 and the negative electrode lead 14 from coming into contact with the first end portion 10 a of the electrode body 10 and conducting. Therefore, the positive electrode body 11 contacts the negative electrode lead 14 at the first end portion 10a of the electrode body 10 and shorts, and the negative electrode body 12 contacts the positive electrode lead 13 at the first end portion 10a of the electrode body 10 and shorts. Can be suppressed. Therefore, the battery 1 with high reliability can be provided.

  Further, in the present embodiment, since the electrode body 10 is wound around the winding axis P, the interlayer between the positive electrode body 11 and the negative electrode body 12 is the axis at each of the first end portion 10a and the second end portion 10b. Open in the direction. According to the present embodiment, since the insulating member 40 is disposed between the first end portion 10a of the electrode body 10 and the positive electrode lead 13 and the negative electrode lead 14, and has liquid retention, the first end of the electrode body 10 The electrolytic solution can be held in a state where the electrolytic solution can be supplied from the portion 10 a to the interlayer between the positive electrode body 11 and the negative electrode body 12. For this reason, it is possible to suppress the shortage of the electrolytic solution in the exterior body 20 and to stabilize the characteristics of the battery 1.

  Moreover, in this embodiment, since the insulating member 40 has cushioning properties, the first end portion 10a of the electrode body 10 is insulated even if unevenness due to the laminated structure of the positive electrode body 11, the negative electrode body 12, and the separator 15 is formed. The space between the exterior body 20 and the first end portion 10 a of the electrode body 10 can be filled with the member 40. Thereby, after deaeration at the time of manufacture of the battery 1, it can suppress that the exterior body 20 formed of the flexible laminate film loses its shape due to the internal negative pressure. Further, it is possible to suppress damage to members (for example, the positive electrode body 11, the negative electrode body 12, the separator 15, the positive electrode lead 13, and the negative electrode lead 14) that are in contact with the insulating member 40.

  In the present embodiment, the insulating member 40 is formed with a through hole 41 through which the positive electrode lead 13 and the negative electrode lead 14 are inserted. Thereby, since the movement of the insulating member 40 with respect to the positive electrode lead 13 and the negative electrode lead 14 can be restricted, the displacement of the insulating member 40 with respect to the positive electrode lead 13, the negative electrode lead 14, and the electrode body 10 can be suppressed. Therefore, it is possible to more reliably suppress at least one of the positive electrode lead 13 and the negative electrode lead 14 from coming into contact with the first end portion 10 a of the electrode body 10.

  In the present embodiment, the outer peripheral edge of the insulating member 40 is provided on the outer side with respect to the winding axis P than the positive electrode body 11 and the negative electrode body 12 when viewed from the axial direction. Thereby, the positive electrode body 11 and the negative electrode body 12 can be covered with the insulating member 40 in the outermost peripheral portion of the electrode body 10 in which the positive electrode body 11, the negative electrode body 12, and the separator 15 are easily displaced from each other in the axial direction. Therefore, it can suppress more reliably that the positive electrode lead 13 and the negative electrode lead 14 contact the 1st end part 10a of the electrode body 10. FIG.

In addition, in the said embodiment, although the peripheral part 24 of the exterior body 20 protrudes along the radial direction from the accommodating part 23, it is not limited to this.
FIG. 4 is a perspective view of a battery according to a first modification of the embodiment.
As shown in FIG. 4, the peripheral edge portion 24 may be bent along the outer peripheral surface of the accommodating portion 23. In this case, the peripheral edge 24 is bent by, for example, drawing after heat-sealing the first flange portion 26 of the first sheet 21 and the second flange portion 28 of the second sheet 22.

  As described above, in the configuration in which the peripheral edge portion 24 is bent along the outer surface of the accommodating portion 23, when the peripheral edge portion 24 is bent, a force is applied to the accommodating portion 23, and the accommodating portion 23 is deformed. Thereby, the electrode body 10 accommodated in the accommodating part 23 deform | transforms, and the positive electrode body 11, the negative electrode body 12, and the separator 15 become easy to mutually shift | deviate to an axial direction (refer FIG. 2). For this reason, by interposing the insulating member 40 between the first end portion 10a of the electrode body 10 and the positive electrode lead 13 and the negative electrode lead 14, the positive electrode body 11 becomes the first electrode body 10 in the same manner as in the above embodiment. It is possible to suppress a short circuit due to contact with the negative electrode lead 14 at the end 10 a and a short circuit due to the negative electrode body 12 contacting the positive electrode lead 13 at the first end 10 a of the electrode body 10. Therefore, the battery 1 can be provided with a small size and high reliability by bending the peripheral edge portion 24.

Moreover, in the battery 1 of the said embodiment, although the positive electrode lead 13 and the negative electrode lead 14 are extended from the 1st end part 10a of the electrode body 10, it is not limited to this.
FIG. 5 is a longitudinal sectional view of a battery according to a second modification of the embodiment.
For example, like the battery 101 shown in FIG. 5, the positive electrode lead 13 may extend from the first end portion 10 a of the electrode body 10, and the negative electrode lead 14 may extend from the second end portion 10 b of the electrode body 10. In this case, the first insulating member 40 </ b> A is interposed between the first end portion 10 a of the electrode body 10 and the second portion 13 b of the positive electrode lead 13. The first insulating member 40A is provided so as to overlap the first end portion 10a of the electrode body 10 and the second portion 13b of the positive electrode lead 13 when viewed from the axial direction. The second insulating member 40 </ b> B is interposed between the second end portion 10 b of the electrode body 10 and the second portion 14 b of the negative electrode lead 14. The second insulating member 40B is provided so as to overlap the second end portion 10b of the electrode body 10 and the second portion 14b of the negative electrode lead 14 when viewed from the axial direction.

  In this way, even if the pair of leads 13 and 14 are configured to extend from different end portions 10a and 10b of the electrode body 10, the pair of leads 13 and 14 and the end portions 10a and 10b of the electrode body 10 By interposing the insulating members 40A and 40B between the two, it is possible to achieve the same effects as the above-described embodiment.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above-described embodiment, the insulating member 40 is formed in a disc shape and covers substantially the entire first end portion 10a of the electrode body 10, but is not limited thereto. The insulating member may be provided so as to overlap the end portions 10a and 10b of the electrode body 10, the positive electrode lead 13, and the negative electrode lead 14 at least when viewed from the axial direction. The insulating member includes an outer peripheral surface of the electrode body 10 and a positive electrode lead from between the first end portion 10a of the electrode body 10 and the second portion 13b of the positive electrode lead 13 and the second portion 14b of the negative electrode lead 14. The third portion 13c of the thirteen and the third portion 14c of the negative electrode lead 14 may be disposed.

  Moreover, in the said embodiment, although the positive electrode lead 13 and the negative electrode lead 14 are penetrated by the through-hole 41 of the insulating member 40, it is not limited to this. For example, the insulating member may have a slit through which the positive electrode lead 13 and the negative electrode lead 14 are inserted. Further, the insulating member may be divided into a plurality of parts.

  Moreover, in the said embodiment, although the insulating member 40 has liquid retention property and cushioning property, it is not limited to this. The insulating member may be formed of a film-like member, for example. The insulating member may be formed of a hard material.

  Moreover, in the said embodiment, while the electrode body 10 is formed in the column shape and the accommodating part 23 of the exterior body 20 is formed in the cylindrical shape, it is not limited to this. For example, the electrode body may be formed in an elliptical column shape, and the housing portion of the exterior body may be formed in an elliptic cylinder shape corresponding to the electrode body.

  Moreover, in the said embodiment, although the bottomed cylindrical cases 25 and 27 are formed in each sheet | seats 21 and 22 which form the exterior body 20, it is not limited to this. That is, a bottomed cylindrical case is formed on one sheet of the pair of sheets forming the exterior body, and the other sheet is formed in a flat plate shape so as to close the case of the one sheet. May be.

  Moreover, in the said embodiment, although the nonaqueous electrolyte secondary battery was mentioned as an example as an example of an electrochemical cell, it is not limited to this case, The structure mentioned above is carried out to an electric double layer capacitor, a primary battery, etc. Can be applied.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1,101 ... Battery (electrochemical cell) 10 ... Electrode body 10a ... 1st edge part (edge part) 10b ... 2nd edge part (edge part) 11 ... Positive electrode body 12 ... Negative electrode body 13 ... Positive electrode lead (lead) 14 ... Negative electrode lead (lead) 20 ... Exterior body 21 ... First sheet (first member) 22 ... Second sheet (second member) 23 ... Housing part 24 ... Peripheral part 40, 40A, 40B ... Insulating member 41 ... Through hole (Insertion part) P ... winding axis (predetermined axis)

Claims (8)

An electrode body wound around a predetermined axis in a state where the positive electrode body and the negative electrode body are laminated;
An exterior body containing the electrode body and the electrolyte;
A lead connected to the electrode body and extending from an axial end of the predetermined axis in the electrode body;
An insulating member interposed between the end of the electrode body and the lead;
Equipped with a,
The exterior body is formed by overlapping the first member and the second member,
The exterior body is
A housing part for sandwiching the electrode body between the first member and the second member, and housing the electrode body;
A peripheral portion formed by overlapping the first member and the second member around the housing portion, and sealing the inside of the housing portion;
With
The peripheral edge portion is bent along the outer surface of the housing portion.
An electrochemical cell characterized by that. An electrode body wound around a predetermined axis in a state where the positive electrode body and the negative electrode body are laminated;
Formed by a laminate film including a metal layer and a resin layer covering the metal layer, and an exterior body containing the electrode body and the electrolyte;
A lead connected to the electrode body and extending from an axial end of the predetermined axis in the electrode body;
An insulating member interposed between the end of the electrode body and the lead;
Equipped with a,
The insulating member has liquid retention.
An electrochemical cell characterized by that. An electrode body wound around a predetermined axis in a state where the positive electrode body and the negative electrode body are laminated;
Formed by a laminate film including a metal layer and a resin layer covering the metal layer, and an exterior body containing the electrode body and the electrolyte;
A lead connected to the electrode body and extending from an axial end of the predetermined axis in the electrode body;
An insulating member interposed between the end of the electrode body and the lead;
Equipped with a,
The insulating member has a cushioning property,
An electrochemical cell characterized by that.   The exterior body is formed by overlapping the first member and the second member formed by the laminate film,
  The exterior body includes a housing portion that houses the electrode body with the electrode body sandwiched between the first member and the second member,
  The accommodating portion is formed in a cylindrical shape in which both ends in the axial direction are closed.
  The electrochemical cell according to claim 2 or 3, wherein The insulating member has liquid retention.
The electrochemical cell according to claim 1. The insulating member has a cushioning property,
The electrochemical cell according to claim 1 or 5 , wherein The insulating member is formed with an insertion portion through which the lead is inserted,
The electrochemical cell according to any one of claims 1 to 6 , characterized in that: The insulating member is formed so that an outer edge is provided on the outer side with respect to the predetermined axis than the positive electrode body and the negative electrode body when viewed from the axial direction.
The electrochemical cell according to any one of claims 1 to 7 , characterized in that

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