JPWO2018092775A1 - Power storage element and power storage device - Google Patents

Abstract

An object of the present invention is to provide a power storage device and a power storage device that can easily release internal heat to the outside even when the exterior sheet is disposed on the outer surface of the case by an adhesive layer. In the present embodiment, an electrode body, a case that accommodates the electrode body, an exterior sheet that extends along the outer surface of the case, and an adhesive layer that fixes the exterior sheet to the outer surface of the case are provided. It has the part which opposes an outer surface through an adhesive layer, and the part which opposes the outer surface of a case directly, It is characterized by the above-mentioned.

Description

Cross-reference of related applications

  This application claims the priority of Japanese Patent Application No. 2006-222473, and the content of Japanese Patent Application No. 2006-222473 is incorporated in the description of the present specification by reference.

  The present invention relates to a power storage element including a case and an outer sheet fixed to the outer peripheral surface of the case via an adhesive layer, and a power storage device including the power storage element.

Conventionally, a battery cell including a metal can case and an insulating exterior body that covers the metal can case is known (see Patent Document 1). Specifically, the battery cell is a secondary battery cell including a metal can case and an insulating exterior body that covers a central portion of the metal can case.
The said insulation exterior body is provided so that the surface part of the said metal case may be coat | covered. The insulating exterior body is formed by a multilayer structure made of a plurality of materials. Specifically, the insulating exterior body is a multilayer sheet having a heat radiation layer, a heat conductive layer, an insulating layer, an adhesive layer, and the like. The adhesive layer plays a role of fixing the insulating outer package and the metal can case in close contact with each other over the entire surface of the insulating outer package. Therefore, the said insulation exterior body coat | covers this battery cell in the direction from which the adhesion layer becomes the said battery cell side, and makes the said adhesion layer and the said metal can case contact.

  In addition, you may implement | achieve that the said insulation exterior body has adhesiveness with the adhesive apply | coated between the said metal can cases. In that case, the said insulation exterior body needs to apply | coat the said adhesive between the said insulating layer and the said metal can case instead of the said adhesion layer.

  In the above-described battery cell, the adhesive layer and the adhesive have a lower thermal conductivity than other layers constituting the insulating outer package such as a heat radiation layer and a heat conductive layer. For this reason, in the said battery cell, since the adhesion layer and the adhesive are arrange | positioned in the whole surface of the said insulation exterior body, internal heat may not fully discharge | release outside.

Japanese Unexamined Patent Publication No. 2009-295381

  Therefore, an object of the present embodiment is to provide a power storage element and a power storage device that can easily release internal heat to the outside even when the exterior sheet is disposed on the outer surface of the case by an adhesive layer.

The electricity storage device of this embodiment is
An electrode body;
A case for housing the electrode body;
An exterior sheet extending along the outer surface of the case;
An adhesive layer for fixing the exterior sheet to the outer surface of the case,
The exterior sheet includes a portion that faces the outer surface of the case via the adhesive layer, and a portion that directly faces the outer surface of the case.

FIG. 1 is a perspective view of a power storage device according to this embodiment. FIG. 2 is an exploded perspective view of the power storage element. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a perspective view of the electrode body of the electricity storage element. FIG. 5 is a schematic view of a cross section at the position VV in FIG. FIG. 6 is a perspective view of a power storage device including the power storage element. FIG. 7 is an exploded perspective view of the power storage device. FIG. 8 is a schematic cross-sectional view of a power storage element according to another embodiment. FIG. 9 is an exploded perspective view of the electricity storage device according to another embodiment with the case body removed. FIG. 10 is a perspective view of the power storage element. FIG. 11 is an exploded perspective view of the electricity storage device according to another embodiment with the case body removed. FIG. 12 is a perspective view of the electricity storage element. FIG. 13 is an exploded perspective view of the electricity storage device according to another embodiment with the case body removed. FIG. 14 is a perspective view of the power storage element. FIG. 15 is an exploded perspective view of a power storage device according to another embodiment. FIG. 16 is a perspective view for explaining an exterior sheet of a power storage element included in the power storage device. FIG. 17 is a schematic diagram illustrating a position of a cooling member of the power storage device. FIG. 18 is a schematic diagram illustrating a position of a cooling member of a power storage device according to another embodiment.

The electricity storage device of this embodiment is
An electrode body;
A case for housing the electrode body;
An exterior sheet extending along the outer surface of the case;
An adhesive layer for fixing the exterior sheet to the outer surface of the case,
The exterior sheet includes a portion that faces the outer surface of the case through the adhesive layer, and a portion that directly faces the outer surface of the case.

  According to such a configuration, since the adhesive layer is not disposed on the entire surface of the exterior sheet, there is a portion in which heat inside the case is directly transmitted from the case to the exterior sheet without passing through the adhesive layer. For this reason, heat transfer is performed more efficiently than the portion where heat is transferred through the adhesive layer in such a portion. Thereby, even if the exterior sheet is disposed on the outer surface of the case by the adhesive layer, it becomes easier to release the internal heat to the outside as compared with the case where the adhesive layer is disposed on the entire surface of the exterior sheet.

The power storage element is
An internal member that is housed in the case and through which the heat of the electrode body is transmitted;
An insulating member disposed between the case and the electrode body, and between the case and the internal member;
The inner member is in contact with a part of the inner surface of the case via the insulating member;
The adhesive layer may be disposed at a predetermined position on the outer surface of the case and avoiding a position where the inner member is in contact with the inner surface of the case via the insulating member. Here, the predetermined position avoiding the position where the internal member is in contact with the inner surface of the case via the insulating member refers to the inner surface of the case via the insulating member as viewed from the normal direction of the outer surface of the case. It is a position which does not overlap with the position which is in contact with.

  According to such a configuration, since the adhesive layer is disposed at a position (a position that does not overlap when viewed from the normal direction of the outer surface of the case) where the heat from the internal member is easily transmitted on the outer surface of the case, The heat inside the electricity storage device transmitted to the case is transmitted to the exterior sheet without being disturbed by the adhesive layer, and is released to the outside.

In the storage element,
The case has a square cylindrical peripheral wall having a plurality of corners in the circumferential direction,
The exterior sheet is fixed to the peripheral wall in a state where at least one corner is straddled in the circumferential direction and tension in the circumferential direction is applied,
The adhesive layer may be disposed at a position that does not overlap the top of the corner as viewed from the thickness direction of the peripheral wall of the case.

  In this way, the exterior sheet is arranged on the outer surface of the peripheral wall so as to straddle the corner portion in a state where tension is applied, so that the exterior sheet is reliably in contact with the case (peripheral wall) at the corner portion. Compared with the case where heat is transmitted to the exterior sheet via the air layer, the heat transmitted from the inside to the case is efficiently transmitted to the exterior sheet, and as a result, the internal heat is more easily released to the outside.

In the storage element,
The electrode body has an electrode wound in a stacked state,
The peripheral wall extends in a direction orthogonal to the first outer wall surface, a pair of first outer wall surfaces orthogonal to the winding center axis direction on both sides of the electrode body in the winding center axis direction of the electrode body, and A pair of second outer wall surfaces connecting corresponding ends of the pair of first outer wall surfaces;
The second outer wall surface is longer than the first outer wall surface in the circumferential direction,
The adhesive layer may be disposed on the second outer wall surface.

  As described above, when the outer sheet is wound in the circumferential direction on the peripheral wall of the rectangular tube shape, the adhesive layer is attached to the long wall surface (the outer wall surface having a large circumferential dimension: the second outer wall surface) where the outer sheet easily floats from the outer surface of the case. By being disposed, it is possible to suitably suppress the occurrence of a gap between the exterior sheet and the outer surface of the case.

In the storage element,
The adhesive layer may be disposed at a position overlapping an end portion of the electrode body in the winding center axis direction of the electrode body and a direction orthogonal to the winding center axis direction.

  In the electrode body, normally, an end portion (uncoated portion or the like) in the winding central axis direction to which a current collector or the like is connected is unlikely to contact the inner surface of the case due to expansion or the like due to charge / discharge. Therefore, the adhesive layer is disposed at a position corresponding to the end of the electrode body on the outer surface of the case so as to avoid a position where heat from the electrode body is easily transmitted on the outer surface of the case. The Thereby, the heat transmitted from the electrode body to the case is transmitted to the exterior sheet without being disturbed by the adhesive layer, and is released to the outside.

The electricity storage device of other embodiments is
An electrode body;
A case having a square cylindrical peripheral wall surrounding the electrode body and having a plurality of corners in the circumferential direction;
An exterior sheet extending in the circumferential direction of the peripheral wall and covering the outer surface of the peripheral wall;
In a state where one end and the other end of the exterior sheet in the circumferential direction are laminated, an adhesive layer that bonds the one end to the other end, and
The stacked one end and the other end are arranged at positions that do not overlap the top of the corner.

  The outer sheet is surely in contact with the corner of the case (peripheral wall) due to the tension, so the thickness of the outer sheet that does not easily release the heat transmitted from the case to the position avoiding this position (the top of the corner). By placing a part with a large area (a part where the end portions are laminated through the adhesive layer), even if the exterior sheet is arranged on the outer surface of the case by the adhesive layer, the internal heat is released to the outside. easy.

In any of the above storage elements,
The outer sheet may have a thermal conductivity of 0.6 W / (m · K) or more and 30 W / (m · K) or less.

  By using the exterior sheet having such thermal conductivity, the heat transferred from the case to the exterior sheet is suitably released to the outside.

In any of the above storage elements,
The outer surface of the case includes a first surface on which an external terminal is disposed, and a second surface opposite to the first surface,
The exterior sheet covers the second surface,
The said adhesive layer may be arrange | positioned in the position facing areas other than said 2nd surface among the outer surfaces of the said case.

  When cooling a power storage element, the surface opposite to the surface where a structure such as an external terminal is disposed on the outer surface of the case is often cooled. For this reason, according to said structure, the contact bonding layer is arrange | positioned in the position facing the area | region other than the surface where the said cooling is easy to be performed in the outer surface of a case (namely, the contact bonding layer in the position which avoided the position where it is easy to cool). When the cooling is performed on the storage element, a sufficient cooling effect can be obtained.

In the power storage device of another embodiment,
A plurality of power storage elements arranged in the first direction, and a plurality of power storage elements including at least one of the power storage elements described above;
And a holding member that holds the plurality of power storage elements.

  According to such a configuration, since the force in the first direction is applied to each of the power storage elements by being held by the holding member, the power storage element having a portion in which the outer sheet and the outer surface of the case directly face each other in the first direction. The outer sheet and the case are brought into close contact with each other by the force applied in the first direction. Thereby, heat transfer from the case to the exterior sheet is suitably performed in the electricity storage element. As a result, in a power storage device including a plurality of power storage elements, even when the power storage element includes an external sheet disposed on the outer surface of the case by an adhesive layer, internal heat is easily released to the outside in the power storage element. .

The power storage device
A cooling member disposed along a row of the plurality of power storage elements arranged in the first direction, and cooling the plurality of power storage elements;
The adhesive layer may be disposed at a position facing an area other than the area cooled by the cooling member on the outer surface of the case.

  Thus, a sufficient cooling effect is obtained in each power storage element by arranging the adhesive layer at a position (avoided position) opposite to the area other than the area cooled by the cooling member on the outer surface of the case.

The electricity storage device of other embodiments is
An electrode body;
A case for housing the electrode body;
An insulating material disposed between the electrode body and the case;
An exterior sheet disposed on the outer surface of the case,
The thermal conductivity of at least one of the insulating material and the exterior sheet is 0.6 W / (m · K) or more and 30 W / (m · K) or less.

  By using at least one of the insulating material and the exterior sheet having such thermal conductivity, heat easily passes through at least one of the insulating material and the exterior sheet. For this reason, the heat generated in the electrode body (that is, the heat inside the case) is easily released to the outside of the case.

  According to the above embodiment, it is possible to provide a power storage element and a power storage device that can easily release internal heat to the outside even when the exterior sheet is disposed on the outer surface of the case by the adhesive layer.

  Hereinafter, an embodiment of a power storage device according to the present invention will be described with reference to FIGS. Examples of the power storage element include a primary battery, a secondary battery, and a capacitor. In the present embodiment, a chargeable / dischargeable secondary battery will be described as an example of a power storage element. In addition, the name of each component (each component) of this embodiment is a thing in this embodiment, and may differ from the name of each component (each component) in background art.

  The electricity storage device of this embodiment is a nonaqueous electrolyte secondary battery. More specifically, the power storage element is a lithium ion secondary battery that utilizes electron transfer that occurs as lithium ions move. This type of power storage element supplies electrical energy. One or a plurality of power storage elements are used. Specifically, when the required output and the required voltage are small, the power storage element is used alone. On the other hand, when at least one of the required output and the required voltage is large, the power storage element is used in a power storage device in combination with another power storage element. In the power storage device, a power storage element used in the power storage device supplies electric energy.

  As shown in FIGS. 1 to 4, the power storage element includes an electrode body 2, a case 3 that accommodates the electrode body 2, an exterior sheet 7 that extends along the outer surface of the case 3, and an exterior sheet 7 that is disposed on the outer surface of the case 3. And an adhesive layer 8 (see FIG. 2 and FIG. 5) to be fixed to. In addition, the power storage element 1 includes an external terminal 4 disposed on the outer surface of the case 3 and a current collector (internal member) 5 that makes the electrode body 2 and the external terminal 4 conductive. The power storage device 1 of the present embodiment also includes an insulating member (insulating material) 6 disposed between the electrode body 2 and the case 3.

  The electrode body 2 has electrodes (positive electrode 23 and negative electrode 24) wound in a stacked state. Specifically, the electrode body 2 is a laminated body 22 in which the winding core 21, the positive electrode 23, and the negative electrode 24 are laminated in a mutually insulated state, and the laminated body 22 wound around the winding core 21. (See FIG. 3 and FIG. 4). As the lithium ions move between the positive electrode 23 and the negative electrode 24 in the electrode body 2, the power storage device 1 is charged and discharged.

  The winding core 21 is usually formed of an insulating material. The core 21 of the present embodiment has a cylindrical shape, more specifically, a flat cylindrical shape. The winding core 21 is formed by winding a sheet having flexibility or thermoplasticity. The sheet of the present embodiment is formed of a synthetic resin.

  The positive electrode 23 includes a strip-shaped metal foil 231 and a positive electrode active material layer 232 stacked on the metal foil 231. This positive electrode active material layer 232 is overlaid on the metal foil 231 in a state where one end portion (uncovered portion) in the width direction of the metal foil 231 is exposed. The metal foil 231 of this embodiment is, for example, an aluminum foil.

  The negative electrode 24 includes a strip-shaped metal foil 241 and a negative electrode active material layer 242 stacked on the metal foil 241. The negative electrode active material layer 242 is formed in a state in which the other edge in the width direction of the metal foil 241 (on the side opposite to the non-covered portion of the metal foil 231 of the positive electrode 23) (uncovered portion) is exposed. 241. The metal foil 241 of this embodiment is, for example, a copper foil.

  In the electrode body 2 of the present embodiment, the positive electrode 23 and the negative electrode 24 configured as described above are wound in a state where they are insulated by the separator 25. That is, in the electrode body 2 of this embodiment, the laminated body 22 of the positive electrode 23, the negative electrode 24, and the separator 25 is wound.

  The separator 25 is an insulating member and is disposed between the positive electrode 23 and the negative electrode 24. Thereby, in the electrode body 2 (specifically, the laminated body 22), the positive electrode 23 and the negative electrode 24 are insulated from each other. The separator 25 holds the electrolytic solution in the case 3. Thereby, at the time of charging / discharging of the electrical storage element 1, lithium ions can move between the positive electrode 23 and the negative electrode 24 that are alternately stacked with the separator 25 interposed therebetween.

The separator 25 has a band shape, and is constituted by a porous film such as polyethylene, polypropylene, cellulose, polyamide, and the like. Separator 25 of this embodiment is provided on a substrate on which an inorganic layer containing inorganic particles such as SiO ₂ particles, Al ₂ O ₃ particles, boehmite (alumina hydrate) is formed by a porous film. It is formed with. The base material of the separator 25 of this embodiment is formed of, for example, polyethylene.

  The dimension of the separator 25 in the width direction is larger than the width of the negative electrode active material layer 242. The separator 25 is disposed between the positive electrode 23 and the negative electrode 24 that are stacked in a state where the positive electrode active material layer 232 and the negative electrode active material layer 242 are displaced in the width direction so as to overlap in the thickness direction (stacking direction). The At this time, the uncoated portion of the positive electrode 23 and the uncoated portion of the negative electrode 24 do not overlap. That is, the uncovered portion of the positive electrode 23 protrudes from the region where the positive electrode 23 and the negative electrode 24 overlap in the width direction (direction orthogonal to the stacking direction), and the non-covered portion of the negative electrode 24 is between the positive electrode 23 and the negative electrode 24. It protrudes in the width direction (direction opposite to the protruding direction of the non-covered portion of the positive electrode 23) from the overlapping region. The electrode body 2 is formed by winding the positive electrode 23, the negative electrode 24, and the separator 25 (that is, the stacked body 22) stacked in such a state. Moreover, in the electrode body 2 of this embodiment, the non-coating laminated part 26 in the electrode body 2 is configured by a portion where only the non-coating part of the positive electrode 23 or the non-coating part of the negative electrode 24 is laminated.

  The uncoated laminated portion 26 is a portion that is electrically connected to the current collector 5 in the electrode body 2. The uncoated laminated portion 26 of the present embodiment has two hollow portions 27 (see FIGS. 2 and 4) sandwiched between the wound positive electrode 23, negative electrode 24, and separator 25 in the winding central axis C direction. It is divided into two parts (divided uncoated laminated parts) 261.

  The uncoated laminated portion 26 configured as described above is provided on each electrode of the electrode body 2. That is, the uncoated laminated portion 26 in which only the uncoated portion of the positive electrode 23 is laminated constitutes the uncoated laminated portion of the positive electrode in the electrode body 2, and the uncoated laminated portion 26 in which only the uncoated portion of the negative electrode 24 is laminated. An uncoated laminated portion of the negative electrode in the electrode body 2 is configured.

  The case 3 includes a case main body 31 having an opening and a cover plate 32 that closes (closes) the opening of the case main body 31. The case 3 houses the electrolytic solution in the internal space 33 (see FIG. 3) together with the electrode body 2 and the current collector 5 and the like. Case 3 is formed of a metal having resistance to the electrolytic solution. The case 3 of the present embodiment is formed of an aluminum metal material such as aluminum or an aluminum alloy, for example.

The electrolytic solution is a non-aqueous electrolytic solution. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. Examples of the organic solvent include cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. The electrolyte salt is LiClO ₄ , LiBF ₄ , LiPF ₆ or the like. Electrolyte of the present embodiment, propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate, propylene carbonate: dimethyl carbonate: ethylmethyl carbonate = 3: 2: in a mixed solvent adjusted at a ratio of 5, 1 mol / L LiPF ₆ Is dissolved.

  As shown in FIGS. 1 to 3, the case 3 is formed by joining the opening peripheral edge portion 34 of the case main body 31 and the peripheral edge portion of the lid plate 32 in an overlapped state. In the case 3, the internal space 33 is defined by the case body 31 and the lid plate 32. In the case 3 of this embodiment, the opening peripheral part 34 of the case main body 31 and the peripheral part of the cover plate 32 are joined by welding.

  The case main body 31 includes a plate-like closing part 311 and a cylindrical body part (peripheral wall) 312 connected to the periphery of the closing part 311.

  The closing part 311 is located at the lower end of the case body 31 when the case body 31 is arranged with the opening facing upward (that is, the bottom wall of the case body 31 when the opening faces upward). ) Part. The blocking part 311 has a rectangular shape when viewed from the normal direction of the blocking part 311.

  In the following description, the long side direction of the closed portion 311 is the X-axis direction of the orthogonal coordinate system, the short side direction of the closed portion 311 is the Y-axis direction of the orthogonal coordinate system, and the normal direction of the closed portion 311 is Z in the orthogonal coordinate system. Axial direction.

  The body portion 312 has a rectangular tube shape having a plurality of corner portions in the circumferential direction. The body portion 312 of the present embodiment has a rectangular tube shape having four corners in the circumferential direction, more specifically, a flat rectangular tube shape. The body portion 312 has a pair of long wall portions 313 extending from the long side at the periphery of the closing portion 311 and a pair of short wall portions 314 extending from the short side at the periphery of the closing portion 311. That is, the pair of long wall portions 313 are opposed to each other with an interval in the Y-axis direction (specifically, an interval corresponding to the short side of the periphery of the closing portion 311), and the pair of short wall portions 314 are spaced in the X-axis direction. (In detail, they are opposed to each other with a gap corresponding to the long side of the periphery of the blocking portion 311). By connecting the end portions of the short wall portion 314 corresponding to the pair of long wall portions 313 (specifically, facing each other in the Y-axis direction), a rectangular tube-shaped body portion 312 is formed.

  As described above, the case body 31 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end portion in the opening direction (Z-axis direction) is closed. The case body 31 accommodates the electrode body 2 with the winding center axis C direction oriented in the X-axis direction. In a state in which the electrode body 2 is accommodated in the case body 31, the body portion 312 has a pair of perpendicular to the winding center axis C direction on both sides of the electrode body 2 in the winding center axis C direction of the electrode body 2. A pair of second outer wall surfaces (long wall portions) extending in a direction orthogonal to the first outer wall surface and connecting corresponding ends of the pair of first outer wall surfaces to each other. 313 outer surface).

  The lid plate 32 is a plate-like member that closes the opening of the case body 31. Specifically, the outline of the cover plate 32 has a shape corresponding to the opening peripheral edge 34 of the case body 31 when viewed from the Z-axis direction. That is, the lid plate 32 is a rectangular plate material that is long in the X-axis direction when viewed from the Z-axis direction. The cover plate 32 contacts the case body 31 so as to close the opening of the case body 31. More specifically, the peripheral edge of the cover plate 32 is overlapped with the open peripheral edge 34 of the case body 31 so that the cover plate 32 closes the opening. In a state where the opening peripheral edge 34 and the cover plate 32 are overlapped, the boundary portion between the cover plate 32 and the case main body 31 is welded. Thereby, the case 3 is configured.

  The exterior sheet 7 includes a portion 71 that faces the outer surface of the case 3 via the adhesive layer 8 and a portion 72 that directly faces the outer surface of the case 3 (see FIG. 2). The exterior sheet 7 is made of an insulating resin. The thermal conductivity of the exterior sheet 7 is 0.6 w / (m · K) or more and 30 W / (m · K) or less. Specifically, for example, the exterior sheet 7 is made of high heat conductive polycarbonate, high heat conductive polyphenylene sulfide, and high heat conductive nylon.

  The exterior sheet 7 covers the outer surface of the trunk portion 312 of the case 3 as shown in FIGS. 1 to 3 and 5. The exterior sheet 7 has a strip shape extending in the circumferential direction of the body portion 312. The exterior sheet 7 is fixed to the body portion 312 in a state where at least one corner portion is straddled in the circumferential direction and a circumferential tension is applied. Details are as follows.

  The first adhesive layer 81, which is the adhesive layer 8 that fixes one end of the outer sheet 7 in the longitudinal direction (the end at which it begins to roll) to the outer surface of the case 3, is the top of the corner in the thickness direction of the body 312. It is arranged at a position that does not overlap with 315. Specifically, the first adhesive layer 81 is disposed at a position facing the long wall portion 313. More specifically, the first adhesive layer 81 is disposed at a position overlapping the end portion (uncoated laminated portion) 26 of the electrode body 2 in the winding center axis C direction as viewed from the Y-axis direction. At this time, the first adhesive layer 81 is disposed at a predetermined position of the body portion 312, avoiding the position where the current collector 5 is in contact with the inner surface of the body portion 312 via the insulating member 6. Yes. The exterior sheet 7 is wound around the body 312 from this position. At this time, the exterior sheet 7 is wound around the trunk portion 312 while applying tension in the circumferential direction of the trunk portion 312. And the exterior sheet 7 is being fixed to the trunk | drum 312 in the state which straddled the circumferential direction at least 1 corner | angular part, and the tension of the circumferential direction was added. The exterior sheet 7 of the present embodiment covers (encloses) the body portion 312 over the entire circumference. Specifically, the second adhesive layer 82, which is the adhesive layer 8 that fixes the other end portion (end portion at the end of winding) in the longitudinal direction of the exterior sheet 7 to the outer surface of the case 3, is positioned so as to overlap the first adhesive layer 81. Is arranged. That is, one end (starting of winding) and the other end (end of winding) of the exterior sheet 7 overlap with each other via the second adhesive layer 82.

  The external terminal 4 is a part that is electrically connected to an external terminal of another power storage element or an external device. The external terminal 4 is formed of a conductive member. For example, the external terminal 4 is formed of a highly weldable metal material such as an aluminum-based metal material such as aluminum or an aluminum alloy, or a copper-based metal material such as copper or a copper alloy. The external terminal 4 of this embodiment has the surface 41 which can weld a bus bar etc. as shown in FIGS.

  The current collector 5 is disposed in the case 3 and is directly or indirectly connected to the electrode body 2 so as to be energized. The current collector 5 of the present embodiment is connected to the electrode body 2 through the clip member 50 so as to be energized. That is, the electrical storage element 1 includes a clip member 50 that connects the electrode body 2 and the current collector 5 so as to allow energization.

  The current collector 5 is formed of a conductive member. The current collector 5 is disposed along the inner surface of the case 3. The current collector 5 of the present embodiment connects the external terminal 4 and the clip member 50 so as to be energized. Specifically, the current collector 5 includes a first connection portion 51 connected to the external terminal 4 so as to be energized, a second connection portion 52 connected to the electrode body 2 so as to be energized, and a first connection portion 51. And a bent portion 53 that connects the second connecting portion 52. In the current collector 5, the bent portion 53 is disposed in the vicinity of the boundary between the lid plate 32 and the short wall portion 314 in the case 3, the first connection portion 51 extends from the bent portion 53 along the lid plate 32, and the second The connecting portion 52 extends from the bent portion 53 along the short wall portion 314. The second connection portion 52 has at least one joining piece 55 that extends from the vicinity of the short wall portion 314 toward the uncoated laminated portion 26 and extends in the same direction as the second connection portion 52. The joining piece 55 is joined to the clip member 50. The joining piece 55 of this embodiment is joined with the clip member 50 by ultrasonic welding, for example.

  The current collector 5 configured as described above is disposed on each of the positive electrode and the negative electrode of the electricity storage device 1. In the electricity storage device 1 of the present embodiment, the current collectors 5 are arranged in the case 3 in the uncoated laminated portion 26 of the positive electrode body 2 and the uncoated laminated portion 26 of the negative electrode, respectively. The positive electrode current collector 5 and the negative electrode current collector 5 are formed of different materials. Specifically, the positive electrode current collector 5 is formed of, for example, aluminum or an aluminum alloy, and the negative electrode current collector 5 is formed of, for example, copper or a copper alloy.

  The clip member 50 is sandwiched so as to bundle the positive electrode 23 or the negative electrode 24 stacked in the uncoated stacked portion 26 (specifically, the bisected uncoated stacked portion 261) of the electrode body 2. Thereby, the clip member 50 makes the positive electrodes 23 or the negative electrodes 24 stacked in the non-coated stacked portion 26 conductive. The clip member 50 of the present embodiment is formed by bending a plate-shaped metal material so that the cross section is U-shaped.

  As shown in FIGS. 2 and 3, the insulating member 6 is disposed between the case 3 (specifically, the case main body 31) and the electrode body 2. The insulating member 6 is made of an insulating resin. The thermal conductivity of the insulating member 6 is preferably 0.6 w / (m · K) or more and 30 W / (m · K) or less, but may be 0.6 w / (m · K) or less. Specifically, for example, the insulating member 6 is formed of high heat conductive polycarbonate, high heat conductive polyphenylene sulfide, and high heat conductive nylon. The insulating member 6 of the present embodiment is formed in a bag shape by bending an insulating sheet-like member cut into a predetermined shape.

  According to the power storage device 1 described above, the adhesive layer 8 is not disposed on the entire surface of the exterior sheet 7, so that the heat inside the case 3 is directly transmitted from the case 3 to the exterior sheet 7 without passing through the adhesive layer 8. There is. For this reason, heat transfer is performed more efficiently than the portion where heat is transmitted through the adhesive layer 8 in such a portion. Thereby, even if the exterior sheet 7 is disposed on the outer surface of the case 3 by the adhesive layer 8 in the power storage device 1, the internal heat is released to the outside as compared with the case where the adhesive layer 8 is disposed on the entire surface of the exterior sheet 7. It is easy to be done.

  In the electricity storage device 1 of the present embodiment, the adhesive layer 8 (both the first adhesive layer 81 and the second adhesive layer 82 in the example of the present embodiment) is a predetermined position on the outer surface of the case 3 and is a current collector. 5 is disposed at a predetermined position avoiding a position where the surface 5 is in contact with the inner surface of the case 3 via the insulating member 6 (see FIG. 5). As described above, the adhesive layer 8 is disposed on the outer surface of the case 3 so as to avoid the position where heat from the current collector 5 is easily transmitted, so that the inside of the power storage device 1 transmitted to the case 3 through the current collector 5 can be obtained. The heat is transmitted to the exterior sheet 7 without being obstructed by the adhesive layer 8 and released to the outside.

  Further, in the power storage device 1 of the present embodiment, the adhesive layer 8 is disposed at a position that does not overlap with the top 315 of the corner in the thickness direction of the body 312 of the case 3. And the exterior sheet 7 is arrange | positioned on the outer surface of the trunk | drum 312 so that a corner | angular part may be straddled in the state in which tension | tensile_strength was added, and the exterior sheet 7 contacts the case 3 (torso 312) reliably in a corner | angular part. Thereby, compared with the case where heat is transmitted from the case 3 to the exterior sheet 7 through the air layer, the heat transmitted from the inside to the case 3 is efficiently transmitted to the exterior sheet 7. As a result, in the electricity storage device 1, the internal heat is more easily released to the outside.

  In the power storage device 1 of the present embodiment, the adhesive layer 8 is disposed on the outer surface of the long wall portion 313. Thus, the outer surface of the long wall portion 313 where the outer sheet 7 is likely to float from the outer surface of the case 3 when the outer sheet 7 is wound in the circumferential direction in the rectangular tubular body 312 (an outer wall surface having a large circumferential dimension). Since the adhesive layer 8 is disposed on the outer surface of the casing 3, the occurrence of a gap between the exterior sheet 7 and the outer surface of the case 3 can be effectively suppressed.

  Further, in the power storage device 1 of the present embodiment, the adhesive layer 8 overlaps the end portion (uncoated laminated portion) 26 of the electrode body 2 in the winding center axis C direction of the electrode body 2 when viewed from the Y-axis direction. Placed in position. Uncoated part of the electrode body 2 (part where the active material layers 232 and 242 are not coated in the metal foils 231 and 241: the end part in the winding central axis C direction where the current collector 5 is connected in the electrode body 2) Is less likely to come into contact with the inner surface of the case 3 due to expansion due to charge and discharge. For this reason, the adhesive layer 8 is disposed at a position corresponding to the uncoated portion on the outer surface of the case 3, thereby avoiding a position where heat from the electrode body 2 is easily transmitted on the outer surface of the case 3. 8 will be arranged. Thereby, in the electrical storage element 1, the heat transmitted from the electrode body 2 to the case 3 is transmitted to the exterior sheet 7 without being disturbed by the adhesive layer 8 and released to the outside.

  Moreover, in the position which overlaps with the coating part (part to which the active material layers 232 and 242 are applied in the metal foils 231 and 241) of the electrode body 2 in the body portion 312 when viewed from the Y-axis direction, the electrode body 2 by charge and discharge is used. Since the body portion 312 swells due to the expansion of the body portion 312, the body portion 312 and the exterior sheet 7 are easily in close contact with each other. For this reason, since the adhesive layer 8 is not disposed at such a position (that is, a position overlapping the coating portion as viewed from the Y-axis direction), heat transferred from the electrode body 2 to the case 3 is not disturbed by the adhesive layer 8. It becomes easy to be transmitted to the exterior sheet 7.

  In the electricity storage device 1 of the present embodiment, the thermal conductivity of the exterior sheet 7 is preferably 0.6 W / (m · K) or more and 30 W / (m · K) or less, but 0.6 w / (m · K). K) It may be the following. By using the exterior sheet 7 having such thermal conductivity, the heat transmitted from the case 3 to the exterior sheet 7 is suitably released to the outside. Moreover, in the electrical storage element 1 of this embodiment, the thermal conductivity of the insulating member 6 is also preferably 0.6 W / (m · K) or more and 30 W / (m · K) or less, but 0.6 w / ( m · K) or less. By using such an insulating member 6, it becomes easy for heat to pass through the insulating member 6, so that heat generated in the electrode body 2 (that is, heat inside the case 3) is easily released to the outside of the case 3. Become.

  Next, an embodiment of the power storage device according to the present invention will be described with reference to FIGS. 6 and 7 as well. However, the same reference numerals are used for the same configurations as those in the above-described embodiment, and detailed descriptions thereof are omitted. Only the configuration will be described in detail.

  The power storage device 10 includes a plurality of power storage elements 1 arranged in the Y-axis direction, a plurality of adjacent members 200 adjacent to the power storage elements 1, and a holding member 400 that holds the plurality of power storage elements 1 and the plurality of adjacent members 200 together. And comprising. The power storage device 10 includes an insulator 500 disposed between the plurality of power storage elements 1 and the holding member 400, and a plurality of bus bars 600 connected to the external terminals 4 of the power storage element 1.

  In each of the plurality of power storage elements 1, as in the above embodiment, the exterior sheet 7 includes a portion that faces the outer surface of the case 3 via the adhesive layer 8, and a portion that directly faces the outer surface of the case 3. Have.

  The adjacent member 200 is between the power storage elements 1 aligned in the X-axis direction, or a member aligned in the Y-axis direction with respect to the power storage element 1 and the power storage element 1 (in the example of the present embodiment, a part of the holding member 400). It is arranged between. The adjacent member 200 includes a plurality of types of adjacent members. The adjacent member 200 of the present embodiment includes a first adjacent member (adjacent member) 210 that is adjacent to the power storage element 1 that is disposed in the middle of the power storage device 10 in the Y-axis direction, and a plurality of power storage elements 1 that are aligned in the Y-axis direction. And the second adjacent member 220 adjacent to the power storage element 1 at the end.

  The first adjacent member 210 is disposed between the power storage elements 1 adjacent to each other in the Y-axis direction at a midway position in the Y-axis direction of the power storage device 10. Accordingly, a predetermined interval (creeping distance or the like) is ensured between the power storage elements 1 arranged in the Y-axis direction via the first adjacent member 210.

  Specifically, the first adjacent member 210 moves the first body portion 211 adjacent to the power storage element 1 (case body 31) and the movement of the power storage element 1 adjacent to the first body portion 211 relative to the first body portion 211. A first restricting portion 212 for restricting.

  The outline of the first main body 211 is a rectangle corresponding to the outline of the adjacent storage element 1 (case 3) when viewed from the Y-axis direction. In addition, the first main body 211 forms an air passage 215 that allows a temperature adjusting fluid (air in the example of the present embodiment) to pass between the power storage elements 1 adjacent in the Y-axis direction. Specifically, the first main body portion 211 has a rectangular corrugated cross-sectional shape. As a result, the first main body 211 comes into contact with the adjacent power storage element 1, so that an air passage 215 is formed between the first main body portion 211 and the power storage element 1.

  The first restricting portion 212 extends in the Y-axis direction from the first main body portion 211, and comes into contact with the power storage element 1 (specifically, the case 3) adjacent to the first main body portion 211 from the outside in the XZ plane direction. The relative movement of the power storage element 1 in the XZ plane direction with respect to the first main body portion 211 is restricted. The first restricting portion 212 extends in the Y-axis direction from at least each corner portion of the first main body portion 211, and extends in the XZ plane direction at the corner portion of the electric storage element 1 (case 3) adjacent to the first main body portion 211. Abut from the outside.

  Second adjacent member 220 is disposed between power storage element 1 and holding member 400 in the Y-axis direction. Thereby, a predetermined interval (creeping distance or the like) is ensured between the storage element 1 and the holding member 400 arranged in the Y-axis direction via the second adjacent member 220.

  Specifically, the second adjacent member 220 includes a second main body portion 221 adjacent to the electric storage element 1 (case main body 31) between the electric storage element 1 and the holding member 400, and an electric storage adjacent to the second main body portion 221. And a second restricting portion 222 that restricts movement of the element 1 relative to the second main body portion 221.

  The outline of the second main body 221 is a rectangle corresponding to the outline of the adjacent storage element 1 (case 3) when viewed from the Y-axis direction. In addition, the second main body portion 221 forms a ventilation path 225 through which a temperature adjusting fluid (air in the example of the present embodiment) passes between the power storage elements 1 adjacent in the Y-axis direction. Specifically, in the second main body portion 221, a plurality of convex portions 226 that protrude toward the adjacent storage element 1 (in the Y-axis direction) and extend in the X-axis direction are arranged at intervals in the Z-axis direction. Thereby, the ventilation path 225 is formed between the 2nd adjacent member 220 and the electrical storage element 1 because the front-end | tip (projection direction front-end | tip) of the convex part 226 contact | abuts the adjacent electrical storage element 1. FIG.

  The second restricting portion 222 extends from the second main body portion 221 in the Y-axis direction, and comes into contact with the power storage element 1 (specifically, the case 3) adjacent to the second main body portion 221 from the outside in the XZ plane direction. The relative movement of the power storage element 1 in the XZ plane direction with respect to the second main body portion 221 is restricted. The second restricting portion 222 extends in the Y-axis direction from at least each corner portion of the second main body portion 221, and extends in the XZ plane direction at the corner portion of the electric storage element 1 (case 3) adjacent to the second main body portion 221. Abut from the outside.

  The holding member 400 surrounds the plurality of power storage elements 1 and the plurality of adjacent members 200, thereby holding the plurality of power storage elements 1 and the plurality of adjacent members 200 together. The holding member 400 is made of a conductive member such as metal. Specifically, the holding member 400 includes a pair of terminal members 410 arranged so that the plurality of power storage elements 1 are positioned therebetween in the Y-axis direction, and a pair of the holding members 400 in a state facing the plurality of power storage elements 1 in the X-axis direction. And an opposing member 420 that connects the terminal members 410 to each other. In the power storage device 10 of the present embodiment, the pair of termination members 410 are disposed in a state where the second adjacent member 220 is sandwiched between the power storage element 1 disposed at the end in the Y-axis direction. A pair of opposing members 420 are arranged on both sides in the X-axis direction of the plurality of power storage elements 1 arranged in the Y-axis direction.

  Each of the pair of termination members 410 extends in the XZ plane direction. Specifically, each of the pair of termination members 410 includes a main body 411 having a contour (rectangular contour in the present embodiment) corresponding to the power storage element 1, and a second main body portion 221 of the second adjacent member 220 from the main body 411. And a pressure contact portion 412 that projects toward the second contact member 220 and abuts against the second adjacent member 220.

  Each of the pair of opposing members 420 extends in the Y-axis direction and is disposed with a gap in the Z-axis direction, and a pair of first connections that connect ends of the pair of beam parts 421. The portion 422 and a midway position in the Y-axis direction (in the example of the present embodiment, a position that overlaps the power storage element 1 arranged at a midway position among the plurality of power storage elements 1 arranged in the Y-axis direction when viewed from the X-axis direction) And a second connecting portion 423 that connects the pair of beam portions 421 to each other.

  Each of the pair of beam portions 421 extends along each corner of the plurality of power storage elements 1 (case 3) arranged in the Y-axis direction. The first connecting portion 422 extends in the Z-axis direction and is connected to the termination member 410. Thereby, the termination member 410 and the opposing member 420 are connected (coupled). The second connecting portion 423 extends in the Z-axis direction at a position overlapping the power storage element 1 in the Y-axis direction.

  The insulator 500 has an insulating property. The insulator 500 is disposed between the facing member 420 and the plurality of power storage elements 1 arranged in the Y-axis direction. Specifically, the insulator 500 covers a region of the holding member 400 that faces at least the plurality of power storage elements 1. Thereby, the insulator 500 insulates between the holding member 400 and the plurality of power storage elements 1 arranged in the Y-axis direction.

  Bus bar 600 is configured by a plate-like member having conductivity such as metal, and electrically connects external terminals 4 of power storage element 1. A plurality of bus bars 600 (the number corresponding to the plurality of power storage elements 1) are provided in the power storage device 10. The plurality of bus bars 600 of the present embodiment connects (conducts) all of the plurality of power storage elements 1 included in the power storage device 10 in series.

  According to the power storage device 10 described above, the force in the Y-axis direction is applied to each of the power storage elements 1 by being held by the holding member 400. For this reason, in the power storage device 10, in the power storage device 1 including the exterior sheet 7 having the portion 72 where the exterior sheet 7 and the outer surface of the case 3 directly face each other in the Y-axis direction, the exterior sheet 7 is applied by a force applied in the Y-axis direction. And case 3 are in close contact with each other. Thereby, heat transfer from the case 3 to the exterior sheet 7 is suitably performed in the electricity storage element 1. As a result, in the power storage device 10 including the plurality of power storage elements 1, even if the exterior sheet 7 includes the power storage element 1 disposed on the outer surface of the case 3 by the adhesive layer 8, the internal heat is generated in the power storage element 1. Easily released to the outside.

  In addition, the electrical storage element 1 and the electrical storage apparatus 10 of this invention are not limited to each above-mentioned embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. For example, the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of an embodiment can be deleted.

  In the electricity storage device 1 of the above-described embodiment, the exterior sheet 7 continuously surrounds the body portion 312 over the entire circumference, but is not limited to this configuration. The structure which covers so that the trunk | drum 312 may be enclosed by the some exterior sheet 7 may be sufficient. That is, each exterior sheet 7 may have a shape that covers a part of the case 3 such as only the long wall portion 313 or only the short wall portion 314. Even in this case, each exterior sheet 7 has a portion 71 that faces the outer surface of the case 3 via the adhesive layer 8, and a portion 72 that directly faces the outer surface of the case 3.

  In the electricity storage device 1 of the above embodiment, the first adhesive layer 81 and the second adhesive layer 82 overlap in the thickness direction of the exterior sheet 7, but the configuration is not limited thereto. The first adhesive layer 81 and the second adhesive layer 82 may be disposed at positions that do not overlap each other.

  Moreover, in the electrical storage element 1 of the said embodiment, although the contact bonding layer 8 is arrange | positioned only at the edge part of the longitudinal direction of the exterior sheet 7, the contact bonding layer 8 may be arrange | positioned in another site | part. That is, the adhesive layer 8 may not be disposed on the entire surface of the exterior sheet 7.

  In the electricity storage device 1 of the above embodiment, at least a part of the exterior sheet 7 (one end portion in the longitudinal direction in the example of the above embodiment) is attached to the case 3 with the adhesive layer 8 (specifically, the first adhesive layer 81). ), But is not limited to this configuration. For example, as shown in FIG. 8, the exterior sheet 7 surrounds the body portion 312 in the circumferential direction, and one end portion and the other end portion of the exterior sheet 7 in the circumferential direction are laminated to each other by the adhesive layer 8. A bonded configuration may be used. That is, the exterior sheet 7 and the case 3 may not be bonded by the adhesive layer 8. At this time, the exterior sheet 7 is wound around the body 312 with a circumferential tension applied.

  In this case, it is preferable that the one end portion and the other end portion stacked via the adhesive layer 8 are arranged at positions where they do not overlap the top portion 315 at the corner portion of the body portion 312. In addition, the one end and the other end laminated via the adhesive layer 8 are arranged at a position overlapping the uncoated laminated portion 26 (uncoated portion) of the electrode body 2 when viewed from the Y-axis direction. More preferably.

  According to such a configuration, the outer sheet 7 is surely brought into contact with the corner portion (specifically, the top portion 315) of the case 3 (body portion 312) by tension, so that the position (the top portion 315 of the corner portion) is avoided. In addition, the exterior sheet 7 is arranged by arranging a portion (a portion where the end portions are laminated via the adhesive layer 8) having a large thickness in the exterior sheet 7 that hardly releases heat transmitted from the case 3 to the outside. Even if it is arranged on the outer surface of the case 3 by the adhesive layer 8, it is easy to release the heat inside the energy storage device 1 to the outside.

  Further, in the current collector 5 in the electricity storage device 1 of the above embodiment, the second part (part connected to the electrode body 2) 52 is formed from the electrode body 2 (specifically, the uncoated laminated portion 26) from the winding central axis C direction. However, the present invention is not limited to this configuration. For example, as shown in FIG. 9, the current collector 5 has a pair of second portions 52 </ b> A spaced apart in the Y-axis direction, and the pair of second portions 52 </ b> A serves as the uncoated laminated portion 26 of the electrode body 2. They may be connected so as to be sandwiched in the Y-axis direction. Also in this case, the adhesive layer 8 is disposed at a position avoiding the position where the current collector 5 is in contact with the inner surface of the body portion 312 via the insulating member 6 as in the case of the power storage element 1 of the above embodiment. . For example, specifically, as shown in FIG. 10, the adhesive layer 8 is disposed at a position facing the short wall portion 314 in the exterior sheet 7.

  Further, as shown in FIG. 11, the current collector 5 has one second portion 52B, and this second portion 52B is connected to the non-covered laminated portion 26 of the electrode body 2 only from one side in the Y-axis direction. It may be configured. Also in this case, the adhesive layer 8 is disposed at a position avoiding the position where the current collector 5 is in contact with the inner surface of the body portion 312 via the insulating member 6. For example, specifically, as shown in FIG. 12, the adhesive layer 8 </ b> A is disposed in a position facing the region of the exterior sheet 7 that overlaps the uncoated laminated portion 26 in the long wall portion 313 on the other side in the Y-axis direction. Is done. Further, the adhesive layer 8B may be disposed at a position facing the short wall portion 314.

  Although the electrode body 2 of the said embodiment is what is called a winding type by which a long electrode (the positive electrode 23 and the negative electrode 24) was wound, it is not limited to this structure. For example, as shown in FIG. 13, the electrode body 2 </ b> A may be a so-called laminated type in which single-wafer or strip-like electrodes (positive electrode and negative electrode) are laminated. In this case, for example, as illustrated in FIG. 14, the adhesive layer 8 is disposed at a position facing the short wall portion 314 in the exterior sheet 7. This is because the short wall portion 314 is a portion where heat from the inside is difficult to be transmitted in the body portion 312, and the adhesive layer 8 is disposed at this position, so that it faces the long wall portion 313 where heat from the inside is easily transmitted. This is because the heat dissipation of the power storage device 1 can be prevented from being lowered as a result of the adhesive layer 8 being disposed at a position, as compared with the case where the heat dissipation to the outside of the heat inside the case 3 through the long wall portion 313 is reduced. Details are as follows.

  In the case of the stacked electrode body 2A, normally, the end of the separator protrudes from the edge of the positive electrode and the edge of the negative electrode in order to insulate the positive electrode from the negative electrode at the end in the X-axis direction of the electrode body 2A. ing. For this reason, when the electrode body 2A is accommodated in the case 3, the electrode body 2A is pushed (press-fitted) into the case main body 31 so that the protruding portion of the separator is bent or overlapped. Become. That is, a separator that is bent or overlapped is located between the electrode of the electrode body 2A and the short wall portion 314 of the case 3. Accordingly, in the body portion 312, the short wall portion 314 is less likely to transmit heat from the inside (heat generated in the electrode body 2 </ b> A (electrode)) than the long wall portion 313. Moreover, in this electricity storage device 1, since the side spacer 9 used also as a guide when the electrode body 2A is housed in the case 3 is disposed between the short wall portion 314 and the electrode body 2A, Is more difficult to be transmitted to the short wall portion 314. Therefore, by arranging the adhesive layer 8 at a position facing the short wall portion 314 where heat from the inside is difficult to be transmitted, as described above, it faces the long wall portion 313 where the heat from the inside is easily transmitted. As compared with the case where the heat dissipation to the outside of the heat inside the case 3 through the long wall portion 313 is reduced by disposing the adhesive layer 8 at the position, a decrease in the heat dissipation of the power storage element 1 is suppressed. That is, in this electricity storage element 1, the adhesive layer 8 is not disposed at a position with high heat dissipation, but the adhesive layer 8 is disposed at a position with low heat dissipation, thereby suppressing a decrease in heat dissipation as the entire energy storage element 1. It is done.

  Here, the side spacer 9 shown in FIG. 13 has insulating properties and is formed of resin. The side spacers 9 have a substantially arc shape when viewed from the Z-axis direction, and a pair of side spacers 9 are disposed so as to sandwich the electrode body 2 from the X-axis direction. The pair of side spacers 9 function as a guide when the electrode body 2A is inserted (press-fitted) into the case main body 31, and in a state where the electrode body 2A is housed in the case 3, the electrode body in the case 3 2A movement (positional deviation, etc.) is restricted. Note that the power storage element 1 including the stacked electrode body 2 </ b> A may be configured without the side spacer 9.

  In the power storage device 10 of the above embodiment, the temperature adjustment of the power storage element 1 is performed by passing a temperature adjusting fluid (for example, air) through the ventilation paths 215 and 225 formed between the power storage element 1 and the adjacent member 200. However, the present invention is not limited to this configuration. For example, as illustrated in FIG. 15, the power storage device 10A may include a cooling member 70 that is disposed along the plurality of power storage elements 1 arranged in the X-axis direction and cools the plurality of power storage elements 1. The cooling member 70 is, for example, a heat sink. The cooling member 70 is in contact with the power storage elements 1 arranged in the X-axis direction, so that the temperature of each power storage element 1 is adjusted. In the example shown in FIG. 15, the cooling member 70 is a water-cooled heat sink. In this power storage device 10A, the temperature of each power storage device 1 can be adjusted even if there is no ventilation path between adjacent power storage devices 1 as in the power storage device 10 of the above-described embodiment. Not in between. That is, in each power storage element 1 of the power storage device 10A, insulation between adjacent power storage elements 1 is achieved by the exterior sheet 7A. Note that in the power storage device 10 </ b> A including the cooling member 70, the adjacent member 200 may be disposed between the adjacent power storage elements 1, and the ventilation paths 215 and 225 may be formed.

  As shown in FIG. 16, in the exterior sheet 7 </ b> A in each power storage element 1 of the power storage device 10 </ b> A, the adhesive layer 8 is disposed at a position facing a region other than the region cooled by the cooling member 70 on the outer surface of the case 3. . The exterior sheet 7 </ b> A also covers the closed portion 311 of the case 3 to insulate each power storage element 1 from the cooling member 70.

  Specifically, the exterior sheet 7 </ b> A extends from each of the rectangular first portion 71 </ b> A corresponding to the closed portion 311 of the case 3 and the pair of long sides of the first portion 71 </ b> A and corresponds to the long wall portion 313 of the case 3. It has a pair of rectangular second parts 72A and a pair of third parts 73A extending from each of the pair of short sides of the first part 71A. The third portion 73A includes a rectangular main body 731A corresponding to the short wall portion 314, and a rectangular extending portion 732A extending from each of the pair of long sides of the main body 731A. The first part 71A covers the blocking part 311, each of the pair of second parts 72A covers the long wall part 313, and each of the main bodies 731A of the pair of third parts 73A covers the short wall part 314. In addition, each of the pair of extending portions 732A of the third portion 73A extends from the main body 731A and covers a part of the long wall portion 313 (an end portion in the X-axis direction), so that the second portion 72A and the main body 731A are connected. It is possible to prevent a gap between the exterior sheets from occurring between the gaps (positions of corners between the long wall portion 313 and the short wall portion 314).

  In the above exterior sheet 7A, the adhesive layer 8 is disposed at the distal end portion of the second portion 72A and the distal end portion of the third portion 73A. That is, the adhesive layer 8 is disposed at a position facing the end portions of the long wall portion 313 and the short wall portion 314 (the end portion on the opening side of the body portion 312 of the case main body 31) in the exterior sheet 7A. As described above, the adhesive layer 8 is disposed at a position other than the closing portion 311 cooled by the cooling member 70, thereby preventing the cooling efficiency of the energy storage device 1 from being lowered by the cooling member 70. In addition, since the connection portion between the external terminal 4 and the current collector 5 is usually arranged inside the end portion on the opening side (the cover plate 32 side) of the body portion 312, The space (gap) is larger than the region (region in which the electrode body 2 is accommodated), and the number of contact sites between the members (such as the current collector 5) arranged in the case 3 and the inner surface of the case 3 is small. (The contact area is small). Thus, the end portion on the opening side of the case 312 is a portion where heat generated by the electrode body 2 or the like is difficult to be transmitted (that is, the inside of the case 3 even when cooled by the cooling member 70 or the like). Is a part that is difficult to be cooled. Accordingly, the adhesive layer 8 is disposed at the end of the body portion 312 on the opening side, so that the adhesive layer 8 is located at a position facing the other region (part) of the body portion 312 where heat from the inside is easily transmitted. As compared with the case where the cooling efficiency inside the case 3 through the other region of the body portion 312 is reduced due to the arrangement, a decrease in the cooling efficiency of the power storage element 1 is suppressed.

  In power storage device 10 </ b> A, in each power storage element 1, adhesive layer 8 may be arranged at second portion 72 </ b> A so as to face the entire area of long wall portion 313. According to this configuration, since the adhesive layer 8 (adhesive layer 8 spreading over the entire area of the long wall portion 313) is interposed between the cases 3 of the two adjacent power storage elements 1, the adhesive layer 8 is not provided. As compared with the case, heat is hardly transmitted from the case 3 of the one storage element 1 to the case 3 of the other storage element 1. Thereby, for example, when the temperature of one of the two adjacent power storage elements 1 rises, the influence of heat from the one power storage element 1 to the other power storage element 1 is suppressed. That is, the temperature rise in the other power storage element 1 due to the heat from the one power storage element 1 is suppressed.

  In the power storage device 10A illustrated in FIG. 15, the cooling member 70 cools each power storage element 1 from the closed portion 311 side, but the configuration is not limited thereto. As illustrated in FIG. 17, in the power storage device 10A, since the dimension in the X-axis direction of the power storage element 1 is larger than the dimension in the Z-axis direction, the cooling member 70 is disposed on the closed portion 311 side where a sufficient cooling area can be secured. Yes. However, as shown in FIG. 18, when the dimension in the Z-axis direction of the electricity storage element 1A is larger than the dimension in the X-axis direction, the cooling member 70 is provided on the short wall portion 314 side so that a sufficient cooling area is secured. Preferably it is arranged. In this case, the adhesive layer 8 is located on the exterior sheet 7 at a position facing an area other than the area cooled by the cooling member 70 on the outer surface of the case 3 (in the example shown in FIG. 18, each long wall portion 313 of the case 3, cooling It is arranged at a position facing the short wall portion (at least one of the right wall short portion 314 in FIG. 18), the closing portion 311, etc.) that does not face the member 70.

  Moreover, in the said embodiment, although the case where an electrical storage element was used as a nonaqueous electrolyte secondary battery (for example, lithium ion secondary battery) which can be charged / discharged was demonstrated, the kind and magnitude | size (capacity | capacitance) of an electrical storage element are arbitrary. It is. Moreover, in the said embodiment, although the lithium ion secondary battery was demonstrated as an example of an electrical storage element, it is not limited to this. For example, the present invention can be applied to various secondary batteries, other primary batteries, and power storage elements of capacitors such as electric double layer capacitors.

Claims (11)

An electrode body;
A case for housing the electrode body;
An exterior sheet extending along the outer surface of the case;
An adhesive layer for fixing the exterior sheet to the outer surface of the case,
The exterior sheet includes a portion that faces the outer surface of the case via the adhesive layer, and a portion that directly faces the outer surface of the case. An internal member that is housed in the case and through which the heat of the electrode body is transmitted;
An insulating member disposed between the case and the electrode body, and between the case and the internal member;
The inner member is in contact with a part of the inner surface of the case via the insulating member;
2. The adhesive layer according to claim 1, wherein the adhesive layer is disposed at a predetermined position on an outer surface of the case and avoids a position where the inner member is in contact with the inner surface of the case via the insulating member. The electricity storage device described. The case has a square cylindrical peripheral wall having a plurality of corners in the circumferential direction,
The exterior sheet is fixed to the peripheral wall in a state where at least one corner is straddled in the circumferential direction and tension in the circumferential direction is applied,
The electrical storage element according to claim 1, wherein the adhesive layer is disposed at a position that does not overlap with a top portion of the corner portion when viewed from a thickness direction of the peripheral wall of the case. The electrode body has an electrode wound in a stacked state,
The peripheral wall extends in a direction orthogonal to the first outer wall surface, a pair of first outer wall surfaces orthogonal to the winding center axis direction on both sides of the electrode body in the winding center axis direction of the electrode body, and A pair of second outer wall surfaces connecting corresponding ends of the pair of first outer wall surfaces;
The second outer wall surface is longer than the first outer wall surface in the circumferential direction,
The electrical storage element according to claim 3, wherein the adhesive layer is disposed on the second outer wall surface.   The storage element according to claim 4, wherein the adhesive layer is disposed at a position overlapping an end portion of the electrode body in a winding center axis direction of the electrode body and a direction orthogonal to the winding center axis direction. An electrode body;
A case having a square cylindrical peripheral wall surrounding the electrode body and having a plurality of corners in the circumferential direction;
An exterior sheet extending in the circumferential direction of the peripheral wall and covering the outer surface of the peripheral wall;
In a state where one end and the other end of the exterior sheet in the circumferential direction are laminated, an adhesive layer that bonds the one end to the other end, and
The power storage element, wherein the one end and the other end that are stacked are arranged at a position that does not overlap a top of the corner.   The electrical storage element of any one of Claims 1-6 whose heat conductivity of the said exterior sheet is 0.6 W / (m * K) or more and 30 W / (m * K) or less. The outer surface of the case includes a first surface on which an external terminal is disposed, and a second surface opposite to the first surface,
The exterior sheet covers the second surface,
The electrical storage element according to claim 1, wherein the adhesive layer is disposed at a position facing a region other than the second surface of the outer surface of the case. A plurality of power storage elements arranged in the first direction, and a plurality of power storage elements including at least one power storage element according to any one of claims 1 to 8,
And a holding member that holds the plurality of power storage elements. A cooling member disposed along a row of the plurality of power storage elements arranged in the first direction, and cooling the plurality of power storage elements;
The power storage device according to claim 9, wherein the adhesive layer is disposed at a position facing an area other than an area cooled by the cooling member on an outer surface of the case. An electrode body;
A case for housing the electrode body;
An insulating material disposed between the electrode body and the case;
An exterior sheet disposed on the outer surface of the case,
The power storage device, wherein the thermal conductivity of at least one of the insulating material and the exterior sheet is 0.6 W / (m · K) or more and 30 W / (m · K) or less.

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