WO2018092775A1 - Power storage element, and power storage device - Google Patents
Power storage element, and power storage device Download PDFInfo
- Publication number
- WO2018092775A1 WO2018092775A1 PCT/JP2017/040961 JP2017040961W WO2018092775A1 WO 2018092775 A1 WO2018092775 A1 WO 2018092775A1 JP 2017040961 W JP2017040961 W JP 2017040961W WO 2018092775 A1 WO2018092775 A1 WO 2018092775A1
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- Prior art keywords
- case
- power storage
- adhesive layer
- electrode body
- exterior sheet
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Classifications
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Definitions
- the present invention relates to a power storage element including a case and an exterior sheet fixed to the outer peripheral surface of the case via an adhesive layer, and a power storage device including the power storage element.
- 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).
- 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
- the insulating exterior body is formed by a multilayer structure made of a plurality of materials.
- 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
- 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
- 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 diagram 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. 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the end portion (uncoated portion or the like) in the winding central axis direction to which the current collector or the like is normally 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).
- the outer sheet may have a thermal conductivity of 0.6 W / (m ⁇ K) or more and 30 W / (m ⁇ K) or less.
- the heat transferred from the case to the exterior sheet is suitably released to the outside.
- 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
- the contact bonding layer is arrange
- the power storage element 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.
- heat transfer from the case to the exterior sheet is suitably performed in the electricity storage element.
- 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.
- the adhesive layer is disposed 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, a sufficient cooling effect can be obtained in each power storage element.
- 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.
- 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 power storage element 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.
- the storage element includes an electrode body 2, a case 3 that houses 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 attached to the outer surface of the case 3. And an adhesive layer 8 (see FIG. 2 and FIG. 5) to be fixed to.
- 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 (a positive electrode 23 and a negative electrode 24) wound in a stacked state.
- 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 has 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 has 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.
- 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 in the width direction of the separator 25 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 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.
- 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.
- 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 at 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 lid 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.
- 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.
- the case 3 is formed by joining the opening peripheral edge 34 of the case main body 31 and the peripheral edge of the lid plate 32 in an overlapped state.
- the internal space 33 is defined by the case body 31 and the lid plate 32.
- 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.
- 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
- 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.
- 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).
- a rectangular tube-shaped body portion 312 is formed.
- the case main body 31 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end 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.
- 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.
- 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 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 (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.
- the exterior sheet 7 is formed 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 body 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.
- 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
- the exterior sheet 7 of the present embodiment covers (encloses) the body portion 312 over the entire circumference.
- 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 (beginning) end of the exterior sheet 7 and the other end (end of winding) are overlapped 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.
- 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 the present embodiment has a surface 41 on which a bus bar or the like can be welded, 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.
- 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.
- 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 power storage device 1.
- 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 of the electrode body 2 (specifically, the bisected uncoated stacked portion 261). 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.
- the insulating member 6 is disposed between the case 3 (specifically, the case 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.
- 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.
- 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.
- 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.
- the adhesive layer 8 is disposed at a position that does not overlap the top 315 of the corner in the thickness direction of the body 312 of the case 3.
- the exterior sheet 7 is arrange
- the adhesive layer 8 is disposed on the outer surface of the long wall portion 313.
- 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.
- 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.
- 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.
- 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. 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.
- 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.
- 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.
- FIGS. 6 and 7 an embodiment of the power storage device according to the present invention will be described with reference to FIGS. 6 and 7 as well.
- 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 collectively holds the plurality of power storage elements 1 and the plurality of adjacent members 200. 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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 power storage element 1 (case 3) adjacent to the first main body portion 211. Abut from the outside.
- 2nd adjacent member 220 is arrange
- 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.
- 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.
- a temperature adjusting fluid air in the example of the present embodiment
- 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.
- the air passage 225 is formed between the second adjacent member 220 and the electricity storage element 1 by the tip of the convex portion 226 (tip in the protruding direction) coming into contact with the adjacent electricity storage element 1.
- 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 power storage element 1 (case 3) adjacent to the second main body portion 221. Abut from the outside.
- the holding member 400 surrounds the periphery of 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.
- 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.
- 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 spreads in the XZ plane direction.
- 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
- 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.
- the bus bar 600 is constituted by a plate-like member having conductivity such as metal, and conducts the external terminals 4 of the power storage element 1 to each other.
- 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.
- the power storage device 10 According to the power storage device 10 described above, a 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.
- 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.
- 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.
- 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.
- a part of the configuration of an embodiment can be deleted.
- each exterior sheet 7 continuously surrounds the body 312 over the entire circumference, but is not limited to this configuration.
- 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.
- the first adhesive layer 81 and the second adhesive layer 82 are overlapped 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.
- the adhesive layer 8 is disposed only at the end portion of the exterior sheet 7 in the longitudinal direction, but the adhesive layer 8 may be disposed at other portions. That is, the adhesive layer 8 may not be disposed on the entire surface of the exterior sheet 7.
- 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).
- the adhesive layer 8 specifically, the first adhesive layer 81.
- 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.
- the one end portion and the other end portion laminated 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.
- 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.
- 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.
- 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.
- 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.
- the present invention is not limited to this configuration.
- 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.
- 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.
- the adhesive layer 8 is disposed at a position facing the short wall portion 314 in the exterior sheet 7.
- 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.
- the electrode body 2 of the above embodiment is a so-called wound type in which long electrodes (the positive electrode 23 and the negative electrode 24) are wound, but is not limited to this configuration.
- 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.
- the adhesive layer 8 is disposed at a position facing the short wall portion 314 in the exterior sheet 7.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the adhesive layer 8 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.
- the side spacers 9 shown in FIG. 13 have insulating properties and are made 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.
- the power storage element 1 including the stacked electrode body 2 ⁇ / b> A may be configured without the side spacer 9.
- 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.
- a temperature adjusting fluid for example, air
- the present invention is not limited to this configuration.
- 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.
- the cooling member 70 is a water-cooled heat sink.
- 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.
- 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.
- 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
- each of the main bodies 731A of the pair of third parts 73A covers the short wall part 314.
- 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).
- the adhesive layer 8 is disposed at the tip of the second part 72A and the tip of the third part 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.
- 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).
- 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.
- 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.
- a decrease in the cooling efficiency of the power storage element 1 is suppressed.
- the adhesive layer 8 may be disposed in the second portion 72A so as to face the entire area of the 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.
- the cooling member 70 cools each power storage element 1 from the closed portion 311 side, but is not limited to this configuration.
- the cooling member 70 is disposed on the closed portion 311 side where a sufficient cooling area can be secured. Yes.
- 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.
- 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.
- an electrical storage element for example, lithium ion secondary battery
- capacitance) of an electrical storage element are arbitrary. It is.
- the lithium ion secondary battery was demonstrated as an example of an electrical storage element, it is not limited to this.
- 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.
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Abstract
The purpose of the present invention is to provide a power storage element and a power storage device, which facilitate dissipation of internal heat to the outside even when an exterior sheet is disposed on the outer surface of a case using an adhesive layer. In the present embodiment, the power storage element is characterized by comprising an electrode body, a case that accommodates the electrode body, an exterior sheet that widens along the outer surface of the case, and an adhesive layer that fixes the exterior sheet to the outer surface of the case, wherein the exterior sheet has a portion that faces the outer surface of the case with the adhesive layer disposed therebetween, and a portion that directly faces the outer surface of the case.
Description
本願は、日本国特願2016-222473号の優先権を主張し、日本国特願2016-222473号の内容は、引用によって本願明細書の記載に組み込まれる。
This application claims the priority of Japanese Patent Application No. 2016-222473, and the content of Japanese Patent Application No. 2016-222473 is incorporated in the description of this application by reference.
本発明は、ケースと、接着層を介して前記ケースの外周面に固定される外装シートと、を備える蓄電素子、及び前記蓄電素子を備える蓄電装置に関するものである。
The present invention relates to a power storage element including a case and an exterior sheet fixed to the outer peripheral surface of the case via an adhesive layer, and a power storage device including the power storage element.
従来から、金属缶ケースと、金属缶ケースを被覆する絶縁外装体と、を備える電池セルが知られている(特許文献1参照)。具体的に、前記電池セルは、金属缶ケースと、前記金属缶ケースの中央部を被覆する絶縁外装体と、を備える、二次電池セルである。
前記絶縁外装体は、前記金属ケースの表面部分を被覆するように設けられる。前記絶縁外装体は、複数の材料からなる多層構造により形成されてなる。具体的には、前記絶縁外装体は、熱放射層、熱伝導層、絶縁層、及び粘着層等を有する多層シートである。前記粘着層は、前記絶縁外装体の全面において、該絶縁外装体と前記金属缶ケースとを密着させて固定する役割を果たす。従って、前記絶縁外装体は、粘着層が前記電池セル側となる向きで該電池セルを被覆し、前記粘着層と前記金属缶ケースとを接触させる。 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.
前記絶縁外装体は、前記金属ケースの表面部分を被覆するように設けられる。前記絶縁外装体は、複数の材料からなる多層構造により形成されてなる。具体的には、前記絶縁外装体は、熱放射層、熱伝導層、絶縁層、及び粘着層等を有する多層シートである。前記粘着層は、前記絶縁外装体の全面において、該絶縁外装体と前記金属缶ケースとを密着させて固定する役割を果たす。従って、前記絶縁外装体は、粘着層が前記電池セル側となる向きで該電池セルを被覆し、前記粘着層と前記金属缶ケースとを接触させる。 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.
尚、前記絶縁外装体は、前記金属缶ケースとの間に塗布された粘着剤により粘着性を有することを実現してもよい。その場合に、前記絶縁外装体は、前記粘着層の代わりに当該粘着剤を前記絶縁層と前記金属缶ケースとの間に塗布する必要がある。
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.
上述の電池セルにおいて、粘着層や粘着剤は、熱放射層や熱伝導層等の絶縁外装体を構成する他の層よりも熱伝導率が低い。このため、前記電池セルでは、前記絶縁外装体の全面において粘着層や粘着剤が配置されているため、内部の熱が外部に十分に放出されない場合がある。
In the battery cell described above, 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.
そこで、本実施形態は、外装シートが接着層によってケースの外面に配置されていても、内部の熱を外部に放出させ易い蓄電素子及び蓄電装置を提供することを目的とする。
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.
本実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する、蓄電素子。 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.
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する、蓄電素子。 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.
本実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する。 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.
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する。 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.
かかる構成によれば、接着層が外装シートの全面に配置されていないことで、ケース内部の熱が接着層を介さずにケースから外装シートに直接伝わる部分がある。このため、かかる部分において接着層を介して熱が伝わる部分より熱伝達が効率よく行われる。これにより、外装シートが接着層によってケースの外面に配置されていても、外装シートの全面に接着層が配置される場合に比べ、内部の熱を外部に放出させ易くなる。
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.
前記蓄電素子は、
前記ケースに収容され且つ前記電極体の熱が伝わる内部部材と、
前記ケースと前記電極体との間、及び前記ケースと前記内部部材との間に配置される絶縁部材と、を備え、
前記内部部材は、前記ケースの内面の一部に前記絶縁部材を介して当接し、
前記接着層は、前記ケースの外面の所定位置であって、前記内部部材が前記絶縁部材を介して該ケースの内面に当接している位置を避けた所定位置に配置されてもよい。ここで、内部部材が絶縁部材を介してケースの内面に当接している位置を避けた所定位置とは、ケースの外面の法線方向から見て、内部部材が絶縁部材を介してケースの内面に当接している位置と重ならない位置である。 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.
前記ケースに収容され且つ前記電極体の熱が伝わる内部部材と、
前記ケースと前記電極体との間、及び前記ケースと前記内部部材との間に配置される絶縁部材と、を備え、
前記内部部材は、前記ケースの内面の一部に前記絶縁部材を介して当接し、
前記接着層は、前記ケースの外面の所定位置であって、前記内部部材が前記絶縁部材を介して該ケースの内面に当接している位置を避けた所定位置に配置されてもよい。ここで、内部部材が絶縁部材を介してケースの内面に当接している位置を避けた所定位置とは、ケースの外面の法線方向から見て、内部部材が絶縁部材を介してケースの内面に当接している位置と重ならない位置である。 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.
かかる構成によれば、ケースの外面において内部部材からの熱が伝わりやすい位置を避けた位置(ケースの外面の法線方向から見て重ならない位置)に接着層が配置されるため、内部部材を通じてケースに伝わった蓄電素子の内部の熱が接着層に邪魔されずに外装シートに伝わり、外部に放出される。
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.
前記蓄電素子では、
前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されてもよい。 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.
前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されてもよい。 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.
このように、張力が加わった状態で角部を跨ぐように外装シートが周壁の外面に配置されることで、角部において外装シートがケース(周壁)と確実に接触し、これにより、ケースから空気層を介して外装シートに熱が伝わる場合に比べ、内部からケースに伝わった熱が効率よく外装シートに伝わり、その結果、前記内部の熱がより外部に放出され易くなる。
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.
前記蓄電素子では、
前記電極体は、積層された状態で巻回される電極を有し、
前記周壁は、前記電極体の巻回中心軸方向における該電極体の両側において該巻回中心軸方向と直交する一対の第一外壁面と、該第一外壁面と直交する方向に広がり且つ前記一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面と、を有し、
前記第二外壁面は、周方向において、前記第一外壁面より長く、
前記接着層は、前記第二外壁面に配置されてもよい。 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.
前記電極体は、積層された状態で巻回される電極を有し、
前記周壁は、前記電極体の巻回中心軸方向における該電極体の両側において該巻回中心軸方向と直交する一対の第一外壁面と、該第一外壁面と直交する方向に広がり且つ前記一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面と、を有し、
前記第二外壁面は、周方向において、前記第一外壁面より長く、
前記接着層は、前記第二外壁面に配置されてもよい。 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.
このように、角筒状の周壁において外装シートが周方向に巻き付けられたときにケースの外面から外装シートが浮きやすい長壁面(周方向の寸法の大きな外壁面:第二外壁面)に接着層が配置されることで、外装シートとケースの外面との間に隙間が生じることが好適に抑えられる。
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.
前記蓄電素子では、
前記接着層は、前記電極体の巻回中心軸方向における該電極体の端部と、該巻回中心軸方向と直交する方向に重なる位置に配置されてもよい。 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.
前記接着層は、前記電極体の巻回中心軸方向における該電極体の端部と、該巻回中心軸方向と直交する方向に重なる位置に配置されてもよい。 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.
電極体において、通常、集電体等が接続される巻回中心軸方向の端部(未塗工部等)は、充放電による膨張等によってケースの内面に接触し難い。このため、ケースの外面における前記電極体の端部と対応する位置に接着層が配置されることで、ケースの外面において電極体からの熱が伝わりやすい位置を避けた位置に接着層が配置される。これにより、電極体からケースに伝わった熱が接着層に邪魔されずに外装シートに伝わり、外部に放出される。
In the electrode body, the end portion (uncoated portion or the like) in the winding central axis direction to which the current collector or the like is normally 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.
他の実施形態の蓄電素子は、
電極体と、
前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケースと、
前記周壁の周方向に延び且つ該周壁の外面を覆う外装シートと、
周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層と、を備え、
前記積層された一方の端部及び他方の端部は、前記角部の頂部と重ならない位置に配置される。 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.
電極体と、
前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケースと、
前記周壁の周方向に延び且つ該周壁の外面を覆う外装シートと、
周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層と、を備え、
前記積層された一方の端部及び他方の端部は、前記角部の頂部と重ならない位置に配置される。 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.
張力によって外装シートがケース(周壁)の角部と確実に接触するため、この位置(角部の頂部)を避けた位置に、ケースから伝わった熱を外部に放出し難い外装シートにおける厚さ寸法の大きくなった部位(接着層を介して端部同士が積層された部位)が配置されることで、外装シートが接着層によってケースの外面に配置されていても内部の熱が外部に放出され易い。
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.
上記のいずれかの蓄電素子では、
前記外装シートの熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下であってもよい。 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.
前記外装シートの熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下であってもよい。 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.
このような熱伝導率の外装シートが用いられることで、ケースから外装シートに伝わった熱が好適に外部に放出される。
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.
上記のいずれかの蓄電素子では、
前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置されてもよい。 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.
前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置されてもよい。 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.
蓄電素子を冷却する場合、ケースの外面における外部端子等の構造物が配置された面と反対側の面が冷却されることが多い。このため、上記の構成によれば、ケースの外面における前記冷却が行われやすい面以外の領域と対向する位置に接着層が配置されている(即ち、冷却されやすい位置を避けた位置に接着層が配置される)ことで、蓄電素子に対して前記冷却が行われる場合に十分な冷却効果が得られる。
When cooling the electricity storage element, the surface opposite to the surface on which the structure such as the external terminal is arranged 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.
他の実施形態の蓄電装置では、
第一方向に並ぶ複数の蓄電素子であって、上記のいずれかの蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、を備える。 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.
第一方向に並ぶ複数の蓄電素子であって、上記のいずれかの蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、を備える。 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.
かかる構成によれば、保持部材によって保持されていることで、蓄電素子のそれぞれに第一方向の力が加わるため、第一方向において外装シートとケースの外面とが直接対向する部分を有する蓄電素子において前記第一方向に加わる力によって外装シートとケースとが密着する。これにより、該蓄電素子においてケースから外装シートへの熱伝達が好適に行われる。その結果、複数の蓄電素子を備える蓄電装置において、外装シートが接着層によってケースの外面に配置されている蓄電素子が含まれていても、該蓄電素子において内部の熱は、外部に放出され易い。
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. .
前記蓄電装置は、
前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置されてもよい。 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.
前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置されてもよい。 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.
このように、ケースの外面における冷却部材によって冷却される領域以外の領域と対向する位置(避けた位置)に接着層が配置されることで、各蓄電素子において十分な冷却効果が得られる。
As described above, since the adhesive layer is disposed 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, a sufficient cooling effect can be obtained in each power storage element.
他の実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記電極体と前記ケースとの間に配置される絶縁材と、
前記ケースの外面に配置される外装シートと、を備え、
前記絶縁材及び前記外装シートの少なくとも一方の熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下である。 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.
電極体と、
前記電極体を収容するケースと、
前記電極体と前記ケースとの間に配置される絶縁材と、
前記ケースの外面に配置される外装シートと、を備え、
前記絶縁材及び前記外装シートの少なくとも一方の熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下である。 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.
このような熱伝導率の絶縁材及び外装シートの少なくとも一方が用いられることで、熱が絶縁材及び外装シートの少なくとも一方を通過し易くなる。このため、電極体で生じた熱(即ち、ケースの内部の熱)がケースの外部へ放出され易くなる。
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.
以上の実施形態によれば、外装シートが接着層によってケースの外面に配置されていても、内部の熱を外部に放出させ易い蓄電素子及び蓄電装置を提供することができる。
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.
以下、本発明に係る蓄電素子の一実施形態について、図1~図5を参照しつつ説明する。蓄電素子には、一次電池、二次電池、キャパシタ等がある。本実施形態では、蓄電素子の一例として、充放電可能な二次電池について説明する。尚、本実施形態の各構成部材(各構成要素)の名称は、本実施形態におけるものであり、背景技術における各構成部材(各構成要素)の名称と異なる場合がある。
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.
本実施形態の蓄電素子は、非水電解質二次電池である。より詳しくは、蓄電素子は、リチウムイオンの移動に伴って生じる電子移動を利用したリチウムイオン二次電池である。この種の蓄電素子は、電気エネルギーを供給する。蓄電素子は、単一又は複数で使用される。具体的に、要求される出力及び要求される電圧が小さいときには、蓄電素子は、単一で使用される。一方、要求される出力及び要求される電圧の少なくとも一方が大きいときには、蓄電素子は、他の蓄電素子と組み合わされて蓄電装置に用いられる。前記蓄電装置では、該蓄電装置に用いられる蓄電素子が電気エネルギーを供給する。
The power storage element 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.
蓄電素子は、図1~図4に示すように、電極体2と、電極体2を収容するケース3と、ケース3の外面に沿って広がる外装シート7と、外装シート7をケース3の外面に固定する接着層8(図2及び図5参照)と、を備える。また、蓄電素子1は、ケース3の外面に配置される外部端子4と、電極体2と外部端子4とを導通させる集電体(内部部材)5と、を備える。本実施形態の蓄電素子1は、電極体2とケース3との間に配置される絶縁部材(絶縁材)6等も、備える。
As shown in FIGS. 1 to 4, the storage element includes an electrode body 2, a case 3 that houses 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 attached to 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.
電極体2は、積層された状態で巻回される電極(正極23及び負極24)を有する。具体的に、電極体2は、巻芯21と、正極23と負極24とが互いに絶縁された状態で積層された積層体22であって、巻芯21の周囲に巻回された積層体22と、を備える(図3及び図4参照)。電極体2においてリチウムイオンが正極23と負極24との間を移動することにより、蓄電素子1が充放電する。
The electrode body 2 has electrodes (a positive electrode 23 and a 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.
巻芯21は、通常、絶縁材料によって形成される。本実施形態の巻芯21は、筒状、より詳しくは、偏平な筒状である。この巻芯21は、可撓性又は熱可塑性を有するシートを巻回することによって形成される。本実施形態の前記シートは、合成樹脂によって形成されている。
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.
正極23は、帯状の金属箔231と、金属箔231に重ねられる正極活物質層232と、を有する。この正極活物質層232は、金属箔231における幅方向の一方の端縁部(非被覆部)を露出させた状態で、該金属箔231に重ねられている。本実施形態の金属箔231は、例えば、アルミニウム箔である。
The positive electrode 23 has 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.
負極24は、帯状の金属箔241と、金属箔241に重ねられる負極活物質層242と、を有する。この負極活物質層242は、金属箔241における幅方向の他方(正極23の金属箔231の非被覆部と反対側)の端縁部(非被覆部)を露出させた状態で、該金属箔241に重ねられている。本実施形態の金属箔241は、例えば、銅箔である。
The negative electrode 24 has 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.
本実施形態の電極体2では、以上のように構成される正極23と負極24とがセパレータ25によって絶縁された状態で巻回される。即ち、本実施形態の電極体2では、正極23、負極24、及びセパレータ25の積層体22が巻回されている。
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.
セパレータ25は、絶縁性を有する部材であり、正極23と負極24との間に配置される。これにより、電極体2(詳しくは、積層体22)において、正極23と負極24とが互いに絶縁される。また、セパレータ25は、ケース3内において、電解液を保持する。これにより、蓄電素子1の充放電時において、リチウムイオンが、セパレータ25を挟んで交互に積層される正極23と負極24との間を移動可能となる。
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.
このセパレータ25は、帯状であり、例えば、ポリエチレン、ポリプロピレン、セルロース、ポリアミドなどの多孔質膜によって構成される。本実施形態のセパレータ25は、SiO2粒子、Al2O3粒子、ベーマイト(アルミナ水和物)等の無機粒子を含んだ無機層が多孔質膜によって形成された基材の上に設けられることで形成されている。本実施形態のセパレータ25の基材は、例えば、ポリエチレンによって形成される。
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.
セパレータ25の幅方向の寸法は、負極活物質層242の幅より大きい。セパレータ25は、正極活物質層232と負極活物質層242とが厚さ方向(積層方向)に重なるように幅方向に位置ずれした状態で重ね合わされた正極23と負極24との間に配置される。このとき、正極23の非被覆部と、負極24の非被覆部とは重なっていない。即ち、正極23の非被覆部が、正極23と負極24との重なる領域から幅方向(積層方向と直交する方向)に突出し、且つ、負極24の非被覆部が、正極23と負極24との重なる領域から幅方向(正極23の非被覆部の突出方向と反対の方向)に突出する。このような状態で積層された正極23、負極24、及びセパレータ25(即ち、積層体22)が巻回されることによって、電極体2が形成される。また、本実施形態の電極体2では、正極23の非被覆部又は負極24の非被覆部のみが積層された部位によって、電極体2における非被覆積層部26が構成される。
The dimension in the width direction of the separator 25 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.
非被覆積層部26は、電極体2における集電体5と導通される部位である。本実施形態の非被覆積層部26は、巻回された正極23、負極24、及びセパレータ25の巻回中心軸C方向から見て、中空部27(図2及び図4参照)を挟んで二つの部位(二分された非被覆積層部)261に区分けされる。
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.
以上のように構成される非被覆積層部26は、電極体2の各極に設けられる。即ち、正極23の非被覆部のみが積層された非被覆積層部26が電極体2における正極の非被覆積層部を構成し、負極24の非被覆部のみが積層された非被覆積層部26が電極体2における負極の非被覆積層部を構成する。
The uncoated laminated portion 26 configured as described above is provided at 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.
ケース3は、開口を有するケース本体31と、ケース本体31の開口を塞ぐ(閉じる)蓋板32と、を有する。ケース3は、電極体2及び集電体5等と共に、電解液を内部空間33(図3参照)に収容する。ケース3は、電解液に耐性を有する金属によって形成される。本実施形態のケース3は、例えば、アルミニウム、又は、アルミニウム合金等のアルミニウム系金属材料によって形成される。
The case 3 includes a case main body 31 having an opening and a lid 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.
電解液は、非水溶液系電解液である。電解液は、有機溶媒に電解質塩を溶解させることによって得られる。有機溶媒は、例えば、プロピレンカーボネート及びエチレンカーボネートなどの環状炭酸エステル類、ジメチルカーボネート、ジエチルカーボネート、及びエチルメチルカーボネートなどの鎖状カーボネート類である。電解質塩は、LiClO4、LiBF4、及びLiPF6等である。本実施形態の電解液は、プロピレンカーボネート、ジメチルカーボネート、及びエチルメチルカーボネートを、プロピレンカーボネート:ジメチルカーボネート:エチルメチルカーボネート=3:2:5の割合で調整した混合溶媒に、1mol/LのLiPF6を溶解させたものである。
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. The electrolyte solution of this embodiment was prepared by mixing 1 mol / L LiPF 6 in a mixed solvent prepared by adjusting propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate at a ratio of propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5. Is dissolved.
ケース3は、図1~図3に示すように、ケース本体31の開口周縁部34と、蓋板32の周縁部とを重ね合わせた状態で接合することによって形成される。また、ケース3では、内部空間33がケース本体31と蓋板32とによって画定されている。本実施形態のケース3では、ケース本体31の開口周縁部34と蓋板32の周縁部とが溶接によって接合されている。
As shown in FIGS. 1 to 3, the case 3 is formed by joining the opening peripheral edge 34 of the case main body 31 and the peripheral edge 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.
ケース本体31は、板状の閉塞部311と、閉塞部311の周縁に接続される筒状の胴部(周壁)312と、を備える。
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.
閉塞部311は、ケース本体31が開口を上に向けた姿勢で配置されたときにケース本体31の下端に位置する(即ち、前記開口が上を向いたときのケース本体31の底壁となる)部位である。閉塞部311は、該閉塞部311の法線方向から見て、矩形状である。
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.
以下では、閉塞部311の長辺方向を直交座標系のX軸方向とし、閉塞部311の短辺方向を直交座標系のY軸方向とし、閉塞部311の法線方向を直交座標系のZ軸方向とする。
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.
胴部312は、周方向に複数の角部を有する角筒形状である。本実施形態の胴部312は、周方向に四つの角部を有する角筒形状、より詳しくは、偏平な角筒形状を有する。胴部312は、閉塞部311の周縁における長辺から延びる一対の長壁部313と、閉塞部311の周縁における短辺から延びる一対の短壁部314とを有する。即ち、一対の長壁部313は、Y軸方向に間隔(詳しくは、閉塞部311の周縁における短辺に相当する間隔)を空けて対向し、一対の短壁部314は、X軸方向に間隔(詳しくは、閉塞部311の周縁における長辺に相当する間隔)を空けて対向する。短壁部314が一対の長壁部313の対応(詳しくは、Y軸方向に対向)する端部同士をそれぞれ接続することによって、角筒状の胴部312が形成される。
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.
以上のように、ケース本体31は、開口方向(Z軸方向)における一方の端部が塞がれた角筒形状(即ち、有底角筒形状)を有する。このケース本体31には、電極体2が巻回中心軸C方向をX軸方向に向けた状態で収容される。この電極体2がケース本体31に収容された状態において、胴部312は、電極体2の巻回中心軸C方向における該電極体2の両側において該巻回中心軸C方向と直交する一対の第一外壁面(短壁部314の外面)と、該第一外壁面と直交する方向に広がり且つ一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面(長壁部313の外面)と、を有する。
As described above, the case main body 31 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end 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).
蓋板32は、ケース本体31の開口を塞ぐ板状の部材である。具体的に、蓋板32の輪郭は、Z軸方向から見て、ケース本体31の開口周縁部34に対応した形状である。即ち、蓋板32は、Z軸方向から見て、X軸方向に長い矩形状の板材である。この蓋板32は、ケース本体31の開口を塞ぐように該ケース本体31に当接する。より具体的には、蓋板32が開口を塞ぐように、蓋板32の周縁部がケース本体31の開口周縁部34に重ねられる。開口周縁部34と蓋板32とが重ねられた状態で、蓋板32とケース本体31との境界部が溶接される。これにより、ケース3が構成される。
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.
外装シート7は、ケース3の外面と接着層8を介して対向する部分71と、ケース3の外面と直接対向する部分72と、を有する(図2参照)。この外装シート7は、絶縁性を有する樹脂によって形成されている。外装シート7の熱伝導率は、0.6w/(m・K)以上、且つ、30W/(m・K)以下である。具体的には、例えば外装シート7は、高熱伝導性ポリカーボネート、高熱伝導性ポリフェニレンサルファイド、高熱伝導性ナイロンによって形成される。
The 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 (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 formed of high heat conductive polycarbonate, high heat conductive polyphenylene sulfide, and high heat conductive nylon.
外装シート7は、図1~図3、及び図5に示すように、ケース3の胴部312の外面を覆う。この外装シート7は、胴部312の周方向に延びる帯状である。この外装シート7は、少なくとも一つの角部を周方向に跨ぎ且つ周方向の張力が加わっている状態で胴部312に固定されている。詳しくは、以下の通りである。
The exterior sheet 7 covers the outer surface of the body 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.
外装シート7の長手方向の一方の端部(捲き始めの端部)をケース3の外面に固定する接着層8である第一接着層81は、胴部312の厚さ方向において角部の頂部315と重ならない位置に配置されている。詳しくは、第一接着層81は、長壁部313と対向する位置に配置されている。より詳しくは、第一接着層81は、巻回中心軸C方向における電極体2の端部(非被覆積層部)26と、Y軸方向から見て重なる位置に配置される。このとき、第一接着層81は、胴部312の所定位置であって、集電体5が絶縁部材6を介して胴部312の内面に当接している位置を避けた位置に配置されている。この位置から外装シート7が胴部312に巻き付けられている。このとき、外装シート7は、胴部312の周方向に張力を加えられつつ該胴部312に巻き付けられている。そして、外装シート7は、少なくとも一つの角部を周方向に跨ぎ且つ周方向の張力が加わっている状態で胴部312に固定されている。本実施形態の外装シート7は、胴部312を全周に亘って覆っている(囲っている)。具体的に、外装シート7の長手方向の他方の端部(巻き終わりの端部)をケース3の外面に固定する接着層8である第二接着層82は、第一接着層81と重なる位置に配置されている。即ち、外装シート7の一方(捲き始め)の端部と、他方(巻き終わり)の端部とは、第二接着層82を介して重なっている。
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 (beginning) end of the exterior sheet 7 and the other end (end of winding) are overlapped via the second adhesive layer 82.
外部端子4は、他の蓄電素子の外部端子又は外部機器等と電気的に接続される部位である。外部端子4は、導電性を有する部材によって形成される。例えば、外部端子4は、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料、銅又は銅合金等の銅系金属材料等の溶接性の高い金属材料によって形成される。本実施形態の外部端子4は、図1~図3に示す通り、バスバ等を溶接可能な面41を有する。
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 the present embodiment has a surface 41 on which a bus bar or the like can be welded, as shown in FIGS.
集電体5は、ケース3内に配置され、電極体2と通電可能に直接又は間接に接続される。本実施形態の集電体5は、クリップ部材50を介して電極体2と通電可能に接続される。即ち、蓄電素子1は、電極体2と集電体5とを通電可能に接続するクリップ部材50を備える。
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.
集電体5は、導電性を有する部材によって形成される。集電体5は、ケース3の内面に沿って配置される。本実施形態の集電体5は、外部端子4とクリップ部材50とを通電可能に接続する。具体的に、集電体5は、外部端子4と通電可能に接続される第一接続部51と、電極体2と通電可能に接続される第二接続部52と、第一接続部51と第二接続部52とを接続する屈曲部53と、を有する。集電体5では、屈曲部53がケース3内の蓋板32と短壁部314との境界近傍に配置され、第一接続部51が屈曲部53から蓋板32に沿って延び、第二接続部52が屈曲部53から短壁部314に沿って延びる。第二接続部52は、短壁部314の近傍から非被覆積層部26に向けて延びると共に第二接続部52と同方向に延びる接合片55を少なくとも一つ有する。この接合片55は、クリップ部材50と接合される。本実施形態の接合片55は、例えば、超音波溶接によってクリップ部材50と接合される。
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.
以上のように構成される集電体5は、蓄電素子1の正極と負極とにそれぞれ配置される。本実施形態の蓄電素子1では、集電体5は、ケース3内において、電極体2の正極の非被覆積層部26と、負極の非被覆積層部26とにそれぞれ配置される。正極の集電体5と負極の集電体5とは、異なる素材によって形成される。具体的に、正極の集電体5は、例えば、アルミニウム又はアルミニウム合金によって形成され、負極の集電体5は、例えば、銅又は銅合金によって形成される。
The current collector 5 configured as described above is disposed on each of the positive electrode and the negative electrode of the power 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.
クリップ部材50は、電極体2の非被覆積層部26(詳しくは、二分された非被覆積層部261)において積層された正極23又は負極24を束ねるように挟む。これにより、クリップ部材50は、非被覆積層部26において積層される正極23同士、又は負極24同士を導通させる。本実施形態のクリップ部材50は、断面がU字状となるように板状の金属材料が曲げ加工されることによって形成される。
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 of the electrode body 2 (specifically, the bisected uncoated stacked portion 261). 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.
絶縁部材6は、図2及び図3に示すように、ケース3(詳しくはケース本体31)と電極体2との間に配置される。この絶縁部材6は、絶縁性を有する樹脂によって形成されている。絶縁部材6の熱伝導率は、0.6w/(m・K)以上、且つ、30W/(m・K)以下が好ましいが、0.6w/(m・K)以下であってもよい。具体的に、例えば絶縁部材6は、高熱伝導性ポリカーボネート、高熱伝導性ポリフェニレンサルファイド、高熱伝導性ナイロンによって形成される。本実施形態の絶縁部材6は、所定の形状に裁断された絶縁性を有するシート状の部材が折り曲げられることによって袋状に形成されている。
As shown in FIGS. 2 and 3, the insulating member 6 is disposed between the case 3 (specifically, the case 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.
以上の蓄電素子1によれば、接着層8が外装シート7の全面に配置されていないことで、ケース3の内部の熱が接着層8を介さずにケース3から外装シート7に直接伝わる部分がある。このため、かかる部分において接着層8を介して熱が伝わる部分より熱伝達が効率よく行われる。これにより、蓄電素子1において外装シート7が接着層8によってケース3の外面に配置されていても、接着層8が外装シート7の全面に配置される場合に比べ、内部の熱が外部に放出され易い。
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.
本実施形態の蓄電素子1では、接着層8(本実施形態の例では第一接着層81と第二接着層82との両方)が、ケース3の外面の所定位置であって、集電体5が絶縁部材6を介して該ケース3の内面に当接している位置を避けた所定位置に配置されている(図5参照)。このように、ケース3の外面において集電体5からの熱が伝わりやすい位置を避けた位置に接着層8が配置されることで、集電体5を通じてケース3に伝わった蓄電素子1の内部の熱が接着層8に邪魔されずに外装シート7に伝わり、外部に放出される。
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.
また、本実施形態の蓄電素子1では、接着層8は、ケース3の胴部312の厚さ方向において角部の頂部315と重ならない位置に配置されている。そして、張力が加わった状態で角部を跨ぐように外装シート7が胴部312の外面に配置されることで、角部において外装シート7がケース3(胴部312)と確実に接触する。これにより、ケース3から空気層を介して外装シート7に熱が伝わる場合に比べ、内部からケース3に伝わった熱が効率よく外装シート7に伝わる。その結果、蓄電素子1において、前記内部の熱がより外部に放出され易くなる。
Further, in the electricity storage device 1 of the present embodiment, the adhesive layer 8 is disposed at a position that does not overlap 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.
また、本実施形態の蓄電素子1では、接着層8は、長壁部313の外面に配置されている。このように、角筒状の胴部312において外装シート7が周方向に巻き付けられたときにケース3の外面から外装シート7が浮きやすい長壁部313の外面(周方向の寸法の大きな外壁面)に接着層8が配置されることで、外装シート7とケース3の外面との間に隙間が生じることが効果的に抑えられる。
In the electricity 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.
また、本実施形態の蓄電素子1では、接着層8が、電極体2の巻回中心軸C方向における該電極体2の端部(非被覆積層部)26と、Y軸方向から見て重なる位置に配置されている。電極体2の未塗工部(金属箔231、241において活物質層232、242が塗られていない部位:電極体2において集電体5が接続される巻回中心軸C方向の端部)は、充放電による膨張等によってケース3の内面に接触し難い。このため、ケース3の外面における前記未塗工部と対応する位置に接着層8が配置されることで、ケース3の外面において電極体2からの熱が伝わりやすい位置を避けた位置に接着層8が配置されることになる。これにより、蓄電素子1では、電極体2からケース3に伝わった熱が接着層8に邪魔されずに外装シート7に伝わり、外部に放出される。
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.
また、胴部312における電極体2の塗工部(金属箔231、241において活物質層232、242が塗られている部位)とY軸方向から見て重なる位置では、充放電による電極体2の膨張によって胴部312が膨らむため、胴部312と外装シート7とが密接しやすい。このため、かかる位置(即ち、前記塗工部とY軸方向から見て重なる位置)に接着層8が配置されないことで、電極体2からケース3に伝わった熱が接着層8に邪魔されずに外装シート7に伝わり易くなる。
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. 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.
本実施形態の蓄電素子1では、外装シート7の熱伝導率が、0.6W/(m・K)以上、且つ、30W/(m・K)以下が好ましいが、0.6w/(m・K)以下であってもよい。このような熱伝導率の外装シート7が用いられることで、ケース3から外装シート7に伝わった熱が好適に外部に放出される。また、本実施形態の蓄電素子1では、絶縁部材6の熱伝導率も、0.6W/(m・K)以上、且つ、30W/(m・K)以下が好ましいが、0.6w/(m・K)以下であってもよい。このような絶縁部材6が用いられることで、熱が絶縁部材6を通過し易くなるため、電極体2で生じた熱(即ち、ケース3の内部の熱)がケース3の外部へ放出され易くなる。
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.
次に、本発明に係る蓄電装置の一実施形態について図6及び図7も参照しつつ説明するが、上述の実施形態と同様の構成には同一符号を用いると共に詳細な説明を省略し、異なる構成についてのみ詳細に説明する。
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.
蓄電装置10は、Y軸方向に並ぶ複数の蓄電素子1と、蓄電素子1と隣り合う複数の隣接部材200と、複数の蓄電素子1と複数の隣接部材200とをひとまとめに保持する保持部材400と、を備える。また、蓄電装置10は、複数の蓄電素子1と保持部材400との間に配置されるインシュレータ500と、蓄電素子1の外部端子4に接続される複数のバスバ600と、を備える。
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 collectively holds the plurality of power storage elements 1 and the plurality of adjacent members 200. 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.
複数の蓄電素子1のそれぞれでは、上記の実施形態と同様に、外装シート7が、ケース3の外面と接着層8を介して対向する部分と、ケース3の外面と直接対向する部分と、を有している。
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.
隣接部材200は、X軸方向に並ぶ蓄電素子1の間、又は蓄電素子1と該蓄電素子1に対してY軸方向に並ぶ部材(本実施形態の例では、保持部材400の一部)との間に配置される。この隣接部材200は、複数種の隣接部材を含む。本実施形態の隣接部材200は、蓄電装置10のY軸方向の途中位置に配置される蓄電素子1と隣り合う第一隣接部材(隣接部材)210と、Y軸方向に並ぶ複数の蓄電素子1のうちの最も端にある蓄電素子1と隣り合う第二隣接部材220と、を有する。
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.
第一隣接部材210は、蓄電装置10のY軸方向の途中位置において、Y軸方向に隣り合う蓄電素子1の間に配置される。これにより、第一隣接部材210を介してY軸方向に並ぶ蓄電素子1の間に、所定の間隔(沿面距離等)が確保される。
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.
具体的に、第一隣接部材210は、蓄電素子1(ケース本体31)と隣り合う第一本体部211と、第一本体部211と隣り合う蓄電素子1の該第一本体部211に対する移動を規制する第一規制部212と、を有する。
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.
第一本体部211の輪郭は、Y軸方向から見て隣り合う蓄電素子1(ケース3)の輪郭に対応する矩形である。また、第一本体部211は、Y軸方向に隣り合う蓄電素子1との間に温度調整用の流体(本実施形態の例では空気)を通過させる通風路215を形成する。詳しくは、第一本体部211は、矩形波形の断面形状を有する。これにより、第一本体部211が隣り合う蓄電素子1と当接することで、該蓄電素子1との間に通風路215が形成される。
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.
第一規制部212は、第一本体部211からY軸方向に延び、第一本体部211と隣り合う蓄電素子1(詳しくはケース3)とX-Z面方向の外側から当接することによって該蓄電素子1の第一本体部211に対するX-Z面方向への相対移動を規制する。この第一規制部212は、第一本体部211の少なくとも各角部からY軸方向に延び、第一本体部211と隣り合う蓄電素子1(ケース3)の角部にX-Z面方向の外側から当接する。
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 power storage element 1 (case 3) adjacent to the first main body portion 211. Abut from the outside.
第二隣接部材220は、Y軸方向において蓄電素子1と保持部材400との間に配置される。これにより、第二隣接部材220を介してY軸方向に並ぶ蓄電素子1と保持部材400との間に、所定の間隔(沿面距離等)が確保される。
2nd adjacent member 220 is arrange | positioned between the electrical storage element 1 and the 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.
具体的に、第二隣接部材220は、蓄電素子1と保持部材400との間において該蓄電素子1(ケース本体31)と隣り合う第二本体部221と、第二本体部221と隣り合う蓄電素子1の該第二本体部221に対する移動を規制する第二規制部222と、を有する。
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.
第二本体部221の輪郭は、Y軸方向から見て隣り合う蓄電素子1(ケース3)の輪郭に対応する矩形である。また、第二本体部221は、Y軸方向に隣り合う蓄電素子1との間に温度調整用の流体(本実施形態の例では空気)を通過させる通風路225を形成する。詳しくは、第二本体部221では、隣り合う蓄電素子1に向けて(Y軸方向に)突出すると共にX軸方向に延びる複数の凸部226が、Z軸方向に間隔をあけて並ぶ。これにより、凸部226の先端(突出方向の先端)が隣り合う蓄電素子1と当接することで、第二隣接部材220と蓄電素子1との間に通風路225が形成される。
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. Thus, the air passage 225 is formed between the second adjacent member 220 and the electricity storage element 1 by the tip of the convex portion 226 (tip in the protruding direction) coming into contact with the adjacent electricity storage element 1.
第二規制部222は、第二本体部221からY軸方向に延び、第二本体部221と隣り合う蓄電素子1(詳しくはケース3)とX-Z面方向の外側から当接することによって該蓄電素子1の第二本体部221に対するX-Z面方向への相対移動を規制する。この第二規制部222は、第二本体部221の少なくとも各角部からY軸方向に延び、第二本体部221と隣り合う蓄電素子1(ケース3)の角部にX-Z面方向の外側から当接する。
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 power storage element 1 (case 3) adjacent to the second main body portion 221. Abut from the outside.
保持部材400は、複数の蓄電素子1と複数の隣接部材200との周囲を囲むことで、これら複数の蓄電素子1と複数の隣接部材200とをひとまとめに保持する。この保持部材400は、金属等の導電性を有する部材によって構成される。具体的に、保持部材400は、Y軸方向において複数の蓄電素子1が間に位置するように配置される一対の終端部材410と、複数の蓄電素子1とX軸方向に対向した状態で一対の終端部材410同士を接続する対向部材420と、を備える。本実施形態の蓄電装置10では、一対の終端部材410が、Y軸方向の端に配置された蓄電素子1との間に第二隣接部材220を挟み込んだ状態で配置される。また、一対の対向部材420がY軸方向に並ぶ複数の蓄電素子1のX軸方向の両側に配置される。
The holding member 400 surrounds the periphery of 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.
一対の終端部材410のそれぞれは、X-Z面方向に広がる。具体的に、一対の終端部材410のそれぞれは、蓄電素子1と対応する輪郭(本実施形態では矩形状の輪郭)を有する本体411と、本体411から第二隣接部材220の第二本体部221に向けて突出し且つ該第二隣接部材220に当接する圧接部412と、を有する。
Each of the pair of termination members 410 spreads 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.
一対の対向部材420のそれぞれは、Y軸方向に延び且つZ軸方向に間隔をあけて配置される一対の梁部421と、一対の梁部421の端部同士を連結する一対の第一連結部422と、Y軸方向における途中位置(本実施形態の例では、Y軸方向に並ぶ複数の蓄電素子1のうちの途中位置に配置された蓄電素子1とX軸方向から見て重なる位置)において一対の梁部421同士を連結する第二連結部423と、を有する。
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.
一対の梁部421のそれぞれは、Y軸方向に並ぶ複数の蓄電素子1(ケース3)の各角部に沿って延びる。第一連結部422は、Z軸方向に延び、終端部材410と連結される。これにより、終端部材410と対向部材420とが接続(連結)される。第二連結部423は、Y軸方向において蓄電素子1と重なる位置においてZ軸方向に延びる。
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.
インシュレータ500は、絶縁性を有する。このインシュレータ500は、対向部材420と、Y軸方向に並ぶ複数の蓄電素子1と、の間に配置される。具体的に、インシュレータ500は、保持部材400における少なくとも複数の蓄電素子1と対向する領域を覆う。これにより、インシュレータ500は、保持部材400と、Y軸方向に並ぶ複数の蓄電素子1と、の間を絶縁する。
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.
バスバ600は、金属等の導電性を有する板状の部材によって構成され、蓄電素子1の外部端子4同士を導通させる。バスバ600は、蓄電装置10において複数(複数の蓄電素子1と対応する数)設けられる。本実施形態の複数のバスバ600は、蓄電装置10に含まれる複数の蓄電素子1の全てを直列に接続する(導通させる)。
The bus bar 600 is constituted by a plate-like member having conductivity such as metal, and conducts the external terminals 4 of the power storage element 1 to each other. 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.
以上の蓄電装置10によれば、保持部材400によって保持されていることで、蓄電素子1のそれぞれにY軸方向の力が加わる。このため、蓄電装置10では、Y軸方向において外装シート7とケース3の外面とが直接対向する部分72を有する外装シート7を備えた蓄電素子1において、Y軸方向に加わる力によって外装シート7とケース3とが密着する。これにより、該蓄電素子1においてケース3から外装シート7への熱伝達が好適に行われる。その結果、複数の蓄電素子1を備える蓄電装置10において、外装シート7が接着層8によってケース3の外面に配置されている蓄電素子1を含んでいても、該蓄電素子1において内部の熱が外部に放出され易い。
According to the power storage device 10 described above, a 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.
尚、本発明の蓄電素子1及び蓄電装置10は、上述の各実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。
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.
上記実施形態の蓄電素子1では、外装シート7は、胴部312を全周に亘って連続して囲っているが、この構成に限定されない。複数の外装シート7によって、胴部312を囲うように覆う構成であってもよい。即ち、各外装シート7が、長壁部313のみや、短壁部314のみ等のケース3の一部を覆う形状であってもよい。この場合でも、各外装シート7は、ケース3の外面と接着層8を介して対向する部分71と、ケース3の外面と直接対向する部分72と、を有する。
In the electricity storage device 1 of the above embodiment, the exterior sheet 7 continuously surrounds the body 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.
上記実施形態の蓄電素子1では、外装シート7の厚さ方向において第一接着層81と第二接着層82とが重なっているが、この構成に限定されない。第一接着層81と第二接着層82とが互いに重ならない位置にそれぞれ配置されてもよい。
In the electricity storage device 1 of the above embodiment, the first adhesive layer 81 and the second adhesive layer 82 are overlapped 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.
また、上記実施形態の蓄電素子1では、外装シート7の長手方向の端部のみに接着層8が配置されているが、他の部位に接着層8が配置されてもよい。即ち、外装シート7の全面に接着層8が配置されていなければよい。
Further, in the electricity storage device 1 of the above embodiment, the adhesive layer 8 is disposed only at the end portion of the exterior sheet 7 in the longitudinal direction, but the adhesive layer 8 may be disposed at other portions. That is, the adhesive layer 8 may not be disposed on the entire surface of the exterior sheet 7.
また、上記実施形態の蓄電素子1では、外装シート7の少なくとも一部(上記実施形態の例では、長手方向の一方の端部)がケース3に接着層8(詳しくは、第一接着層81)を介して固定されているが、この構成に限定されない。例えば、図8に示すように、外装シート7が胴部312を周方向に囲い且つ周方向における外装シート7の一方の端部と他方の端部とが積層された状態で互いに接着層8によって接着された構成であってもよい。即ち、外装シート7とケース3とが、接着層8によって接着されていない構成でもよい。このとき、外装シート7には、周方向の張力が加わった状態で、胴部312に巻き付けられている。
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.
この場合、接着層8を介して積層された前記一方の端部及び前記他方の端部は、胴部312の角部における頂部315と重ならない位置に配位置されることが好ましい。また、接着層8を介して積層された前記一方の端部及び前記他方の端部は、電極体2の非被覆積層部26(未塗工部)とY軸方向から見て重なる位置に配置されることがより好ましい。
In this case, it is preferable that the one end portion and the other end portion laminated 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.
かかる構成によれば、張力によって外装シート7がケース3(胴部312)の角部(詳しくは、頂部315)と確実に接触するため、この位置(角部の頂部315)を避けた位置に、ケース3から伝わった熱を外部に放出し難い外装シート7における厚さ寸法の大きくなった部位(接着層8を介して端部同士が積層された部位)を配置することで、外装シート7が接着層8によってケース3の外面に配置されていても蓄電素子1の内部の熱を外部に放出させ易い。
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.
また、上記実施形態の蓄電素子1における集電体5では、第二部位(電極体2に接続される部位)52が巻回中心軸C方向から電極体2(詳しくは、非被覆積層部26)に当接するように配置されているが、この構成に限定されない。例えば図9に示すように、集電体5が、Y軸方向に間隔をあけた一対の第二部位52Aを有し、これら一対の第二部位52Aが電極体2の非被覆積層部26をY軸方向に挟み込むように接続されてもよい。この場合も、上記実施形態の蓄電素子1と同様に、接着層8は、集電体5が絶縁部材6を介して胴部312の内面に当接している位置を避けた位置に配置される。例えば具体的には、図10に示すように、接着層8は、外装シート7における短壁部314と対向する位置に配置される。
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.
また、図11に示すように、集電体5が一つの第二部位52Bを有し、この第二部位52BがY軸方向の一方側のみから電極体2の非被覆積層部26に接続される構成でもよい。この場合も、接着層8は、集電体5が絶縁部材6を介して胴部312の内面に当接している位置を避けた位置に配置される。例えば具体的には、図12に示すように、接着層8Aは、外装シート7において、Y軸方向の他方側の長壁部313における非被覆積層部26と重なる領域と対向する位置に配置に配置される。また、接着層8Bは、短壁部314と対向する位置に配置されてもよい。
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.
上記実施形態の電極体2は、長尺な電極(正極23及び負極24)が巻回された、いわゆる巻回型であるが、この構成に限定されない。例えば図13に示すように、電極体2Aは、枚葉状または短冊状の電極(正極及び負極)が積層された、いわゆる積層型でもよい。この場合、例えば図14に示すように、接着層8は、外装シート7における短壁部314と対向する位置に配置される。これは、短壁部314が胴部312において内部からの熱が伝わり難い部位であるため、この位置に接着層8が配置されることで、内部からの熱が伝わりやすい長壁部313と対向する位置に接着層8が配置されることによって長壁部313を通じたケース3内部の熱の外部への放熱性が低下する場合に比べ、蓄電素子1の放熱性の低下が抑えられるからである。詳しくは、以下の通りである。
The electrode body 2 of the above embodiment is a so-called wound type in which long electrodes (the positive electrode 23 and the negative electrode 24) are wound, but is not limited to this configuration. 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.
積層型の電極体2Aの場合、通常、電極体2AのX軸方向の端部では、正極と負極との絶縁を図るために、セパレータの端部が正極の端縁及び負極の端縁から突出している。このため、電極体2Aがケース3内に収容される際に電極体2Aがケース本体31に押し込まれる(圧入される)ことで、このセパレータの突出している部位が折れ曲がったり複数重なったりした状態となる。即ち、電極体2Aの電極とケース3の短壁部314との間に折れ曲がったり複数重なったりしたセパレータが位置した状態となっている。これにより、胴部312において、短壁部314は、長壁部313よりも内部からの熱(電極体2A(電極)で生じた熱等)が伝わり難くなっている。しかも、この蓄電素子1では、電極体2Aがケース3内に収納される際のガイドとしても使用されるサイドスペーサ9が短壁部314と電極体2Aとの間に配置されているため、内部の熱が短壁部314へ、より伝わり難くなっている。よって、この内部からの熱が伝わり難くなっている短壁部314と対向する位置に接着層8が配置されることで、上述のように、内部からの熱が伝わりやすい長壁部313と対向する位置に接着層8が配置されることによって長壁部313を通じたケース3内部の熱の外部への放熱性が低下する場合に比べ、蓄電素子1の放熱性の低下が抑えられる。即ち、この蓄電素子1では、放熱性の高い位置に接着層8を配置せずに、放熱性の低い位置に接着層8を配置することによって、蓄電素子1全体としての放熱性の低下が抑えられる。
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.
ここで、図13に示すサイドスペーサ9は、絶縁性を有し、樹脂によって形成されている。このサイドスペーサ9は、Z軸方向から見て略円弧状であり、電極体2をX軸方向から挟み込むように一対配置されている。この一対のサイドスペーサ9は、ケース本体31に電極体2Aが挿入(圧入)される際に、ガイドとして働き、ケース3内に電極体2Aが収納された状態では、ケース3内での電極体2Aの動き(位置ズレ等)を規制する。尚、積層型の電極体2Aを備えた蓄電素子1は、サイドスペーサ9を備えない構成でもよい。
Here, the side spacers 9 shown in FIG. 13 have insulating properties and are made 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.
上記実施形態の蓄電装置10では、温度調整用の流体(例えば、空気)が蓄電素子1と隣接部材200との間に形成される通風路215、225を通過することで蓄電素子1の温度調整が行われるが、この構成に限定されない。例えば図15に示すように、蓄電装置10Aは、X軸方向に並ぶ複数の蓄電素子1に沿って配置され、該複数の蓄電素子1を冷却する冷却部材70を備えていてもよい。この冷却部材70は、例えばヒートシンクである。そして、この冷却部材70がX軸方向に並ぶ蓄電素子1と接していることで、各蓄電素子1の温度が調整される。図15に示す例では、冷却部材70は、水冷式のヒートシンクである。この蓄電装置10Aでは、上記実施形態の蓄電装置10のように隣り合う蓄電素子1同士の間に通風路がなくても各蓄電素子1の温度調整が可能であるため、隣接部材が蓄電素子1間に配置されていない。即ち、蓄電装置10Aの各蓄電素子1では、隣接する蓄電素子1間の絶縁が外装シート7Aによって図られている。尚、冷却部材70を備える蓄電装置10Aにおいても、隣り合う蓄電素子1間に隣接部材200が配置され、通風路215、225が形成されていてもよい。
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.
図16に示すように、蓄電装置10Aの各蓄電素子1における外装シート7Aでは、接着層8が、ケース3の外面における冷却部材70によって冷却される領域以外の領域と対向する位置に配置される。また、この外装シート7Aは、ケース3の閉塞部311も覆うことにより、各蓄電素子1と冷却部材70との間を絶縁している。
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.
具体的に、外装シート7Aは、ケース3の閉塞部311と対応する矩形状の第一部位71Aと、第一部位71Aの一対の長辺のそれぞれから延び且つケース3の長壁部313と対応する矩形状の一対の第二部位72Aと、第一部位71Aの一対の短辺のそれぞれから延びる一対の第三部位73Aと、を有する。第三部位73Aは、短壁部314と対応する矩形状の本体731Aと、本体731Aの一対の長辺のそれぞれから延びる矩形状の延設部732Aと、を有する。第一部71Aは、閉塞部311を覆い、一対の第二部位72Aのそれぞれは、長壁部313を覆い、一対の第三部位73Aの本体731Aのそれぞれは、短壁部314を覆う。また、第三部位73Aの一対の延設部732Aのそれぞれは、本体731Aから延びて長壁部313の一部(X軸方向の端部)を覆うことにより、第二部位72Aと本体731Aとの間(長壁部313と短壁部314との角部の位置)に外装シートの隙間が生じることが防がれる。
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).
以上の外装シート7Aにおいて、接着層8は、第二部位72Aの先端部と第三部位73Aの先端部とに配置されている。即ち、接着層8は、外装シート7Aにおいて、長壁部313及び短壁部314の端部(ケース本体31の胴部312における開口側の端部)と対向する位置に配置されている。このように、冷却部材70によって冷却される閉塞部311以外の位置に接着層8が配置されることで、冷却部材70による蓄電素子1の冷却効率の低下が防がれる。しかも、胴部312の開口側(蓋板32側)の端部の内側には、通常、外部端子4と集電体5との接続部等が配置されているため、ケース3内の他の領域(電極体2が収容されている領域)に比べて空間(隙間)が多く、且つ、ケース3内に配置された部材(集電体5等)とケース3の内面との接触部位が少なく(接触面積が小さく)、これにより、前記開口側の端部は、胴部312において電極体2等で生じた熱の伝わり難い部位(即ち、冷却部材70等によって冷却してもケース3の内部が冷却され難い部位)となっている。従って、この胴部312の開口側の端部位置に接着層8が配置されることで、内部からの熱が伝わりやすい胴部312の他の領域(部位)と対向する位置に接着層8が配置されることによって胴部312の前記他の領域を通じたケース3内部の冷却効率が低下する場合に比べ、蓄電素子1の冷却効率の低下が抑えられる。
In the above exterior sheet 7A, the adhesive layer 8 is disposed at the tip of the second part 72A and the tip of the third part 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.
尚、蓄電装置10Aでは、各蓄電素子1において、接着層8が長壁部313の全域と対向するように第二部位72Aに配置されてもよい。かかる構成によれば、隣接する二つの蓄電素子1のケース3同士の間に接着層8(長壁部313の全域に広がる接着層8)が介在することとなるため、前記接着層8がない場合に比べ、一方の蓄電素子1のケース3から他方の蓄電素子1のケース3に熱が伝わり難くなる。これにより、例えば、前記隣接する二つの蓄電素子1のうちの一方の蓄電素子1の温度が上昇したときに、前記一方の蓄電素子1から他方の蓄電素子1への熱の影響が抑えられる。即ち、前記一方の蓄電素子1からの熱に起因する前記他方の蓄電素子1での温度上昇が抑えられる。
In the power storage device 10A, in each power storage element 1, the adhesive layer 8 may be disposed in the second portion 72A so as to face the entire area of the 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.
また、図15に示す蓄電装置10Aでは、冷却部材70は、各蓄電素子1を閉塞部311側から冷却するがこの構成に限定されない。図17に示すように、蓄電装置10Aでは、蓄電素子1のX軸方向の寸法がZ軸方向の寸法より大きいため、冷却面積が十分に確保できる閉塞部311側に冷却部材70が配置されている。しかし、図18に示すように、蓄電素子1AのZ軸方向の寸法がX軸方向の寸法より大きい場合には、冷却面積が十分に確保されるよう、短壁部314側に冷却部材70が配置されるのが好ましい。この場合、接着層8は、外装シート7において、ケース3の外面における冷却部材70によって冷却される領域以外の領域と対向する位置(図18に示す例では、ケース3の各長壁部313、冷却部材70と対向していない短壁部(図18における右側の短壁部)314、閉塞部311等の少なくとも一つ)と対向する位置に配置される。
In the power storage device 10A shown in FIG. 15, the cooling member 70 cools each power storage element 1 from the closed portion 311 side, but is not limited to this configuration. 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.
また、上記実施形態においては、蓄電素子が充放電可能な非水電解質二次電池(例えばリチウムイオン二次電池)として用いられる場合について説明したが、蓄電素子の種類や大きさ(容量)は任意である。また、上記実施形態において、蓄電素子の一例として、リチウムイオン二次電池について説明したが、これに限定されるものではない。例えば、本発明は、種々の二次電池、その他、一次電池や、電気二重層キャパシタ等のキャパシタの蓄電素子にも適用可能である。
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)
- 電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する、蓄電素子。 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. - 前記ケースに収容され且つ前記電極体の熱が伝わる内部部材と、
前記ケースと前記電極体との間、及び前記ケースと前記内部部材との間に配置される絶縁部材と、を備え、
前記内部部材は、前記ケースの内面の一部に前記絶縁部材を介して当接し、
前記接着層は、前記ケースの外面の所定位置であって、前記内部部材が前記絶縁部材を介して該ケースの内面に当接している位置を避けた所定位置に配置される、請求項1に記載の蓄電素子。 An internal member housed in the case and through which 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. - 前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されている、請求項1又は2に記載の蓄電素子。 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. - 前記電極体は、積層された状態で巻回される電極を有し、
前記周壁は、前記電極体の巻回中心軸方向における該電極体の両側において該巻回中心軸方向と直交する一対の第一外壁面と、該第一外壁面と直交する方向に広がり且つ前記一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面と、を有し、
前記第二外壁面は、周方向において、前記第一外壁面より長く、
前記接着層は、前記第二外壁面に配置される、請求項3に記載の蓄電素子。 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. - 前記接着層は、前記電極体の巻回中心軸方向における該電極体の端部と、該巻回中心軸方向と直交する方向に重なる位置に配置される、請求項4に記載の蓄電素子。 The electric 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.
- 電極体と、
前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケースと、
前記周壁の周方向に延び且つ該周壁の外面を覆う外装シートと、
周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層と、を備え、
前記積層された一方の端部及び他方の端部は、前記角部の頂部と重ならない位置に配置される、蓄電素子。 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. - 前記外装シートの熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下である、請求項1~6のいずれか1項に記載の蓄電素子。 The electricity storage device according to any one of claims 1 to 6, wherein a thermal conductivity of the exterior sheet is 0.6 W / (m · K) or more and 30 W / (m · K) or less.
- 前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置される、請求項1~7のいずれか1項に記載の蓄電素子。 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 electricity storage device according to any one of claims 1 to 7, wherein the adhesive layer is disposed at a position facing an area of the outer surface of the case other than the second surface. - 第一方向に並ぶ複数の蓄電素子であって、請求項1~8のいずれか1項に記載の蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、を備える、蓄電装置。 A plurality of power storage elements arranged in the first direction, the 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. - 前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置される、請求項9に記載の蓄電装置。 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. - 電極体と、
前記電極体を収容するケースと、
前記電極体と前記ケースとの間に配置される絶縁材と、
前記ケースの外面に配置される外装シートと、を備え、
前記絶縁材及び前記外装シートの少なくとも一方の熱伝導率は、0.6W/(m・K)以上、且つ、30W/(m・K)以下である、蓄電装置。 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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