JP2011023239A - Nonaqueous electrolyte battery and nonaqueous electrolyte battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery and nonaqueous electrolyte battery module with a high heat dissipation property. <P>SOLUTION: The nonaqueous electrolyte battery includes a battery element; a flexible outer case 14 for housing the battery element; a positive lead terminal part 16a and negative electrode lead terminal part 16b drawn out from the outer case 14 to the external; and a heat-dissipating sheet 18 which is in contact with the outer case 14. The outer circumference of the outer case 14 is formed in a rectangular shape. Three sides, except for one valley-folded side out of outer circumferential sides of the outer case 14, are jointed at a predetermined width to form a sealed part. The positive electrode lead terminal part 16a and negative electrode lead terminal part 16b are drawn out from the sealed part opposite to the one valley-folded side. The heat-dissipating sheet 18 includes a metal sheet 18c, and resin sheets 18a, 18b joined to both main surfaces of the metal sheet 18c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a nonaqueous electrolyte battery and a nonaqueous electrolyte battery module provided with a flexible packaging material.

  A non-aqueous electrolyte battery represented by a lithium ion secondary battery is widely used as a power source for portable devices such as a mobile phone and a notebook personal computer because of its high energy density. With the trend toward higher capacities of lithium-ion secondary batteries as mobile devices become more sophisticated, flat non-electrolyte batteries that use flexible laminate sheathing materials have been developed to further improve energy density. Many are used.

  For example, Patent Document 1 describes a flat type non-aqueous electrolyte battery using a conventional laminate exterior material. FIG. 13 is a perspective view of the nonaqueous electrolyte battery described in Patent Document 1. FIG. In FIG. 13, the nonaqueous electrolyte battery 100 is an electrode in which a battery element is housed in an exterior material 103 made of a laminate film that has been deep-drawn to form a space 106 and is electrically connected to each electrode of the battery element. The terminal leads 104 and 105 are drawn out from the inside of the exterior material 103. Further, the exterior material 103 is a portion where three sides other than the one side where the valley is folded are thermally welded with a predetermined width, and the electrode terminal leads 104 and 105 are drawn out, in the periphery subjected to deep drawing. The side part 107 heat-welded other than is folded.

  Patent Document 2 discloses a flat battery element made of a sheet-like or film-like positive electrode plate, a separator for holding an electrolyte, and a negative electrode plate, respectively, and an exterior formed by a laminate sheet mainly composed of a resin film having a polyamide resin layer. A non-aqueous electrolyte secondary battery housed in a case is described.

  On the other hand, recently, with the improvement in performance of nonaqueous electrolyte batteries, nonaqueous electrolyte batteries have begun to be used as power sources other than the power source of portable devices. For example, non-aqueous electrolyte batteries have begun to be used for power sources for automobiles and motorcycles, power sources for moving bodies such as robots, and the like.

  Further, when the non-aqueous electrolyte battery is used for a power source for automobiles or motorcycles, a power source for a moving body such as a robot, etc., a plurality of non-aqueous electrolyte batteries are combined and used as a module for higher capacity. When the non-aqueous electrolyte battery is used as a module in this way, heat from each non-aqueous electrolyte battery generated during charging / discharging becomes difficult to dissipate to the outside, so that heat dissipation from each non-aqueous electrolyte battery is improved. There is a need.

  For example, in Patent Document 3, a peripheral part of a pair of exterior films is joined to a battery main body in which a power generation element is sealed in the exterior film and the power generation element is connected to the outside from a joint part where the peripheral part is joined. A battery module is formed by stacking a plurality of batteries composed of electrode tabs drawn out in a plurality of stages and connecting electrode tabs of adjacent batteries in the stacking direction so that each battery is connected in series, parallel, or series-parallel. Is described.

  Patent Document 4 includes a nonaqueous electrolyte containing a positive electrode, a negative electrode, and a lithium salt, and is sealed in a flat battery container having a thickness of less than 12 mm, and has an energy capacity of 30 Wh or more and a volume energy density of 180 Wh / L. There is described a battery module case for housing battery modules in which a plurality of unit cells as described above are arranged in parallel and electrically connected.

Japanese Patent No. 3829502 Japanese Patent No. 4135353 Japanese Patent No. 3649213 Japanese Patent No. 4102957

  However, in Patent Documents 1 to 4, no consideration is given to the heat dissipation of each battery itself, and in Patent Documents 3 and 4, no consideration is given to the heat dissipation of the battery module.

  This invention solves the said problem, and provides a nonaqueous electrolyte battery and a nonaqueous electrolyte battery module with high heat dissipation.

  The non-aqueous electrolyte battery of the present invention includes a battery element, a flexible exterior material that houses the battery element, an electrode lead terminal portion that is drawn out from the exterior material, and a heat dissipation member that contacts the exterior material The outer periphery of the exterior material is formed in a rectangular shape, and the outer periphery of the exterior material is joined with a predetermined width on three sides other than the one side that is valley-folded. A sealing portion is formed, and the electrode lead terminal portion is drawn out from the sealing portion facing the one side where the valley is folded, and the heat radiating member covers a sheet-like metal member and at least an outer peripheral portion of the metal member. It is a sheet-like material containing a resin member, or a sheet-like material containing a resin and thermally conductive inorganic particles.

  Moreover, the nonaqueous electrolyte battery module of the present invention is characterized in that a plurality of the nonaqueous electrolyte batteries of the present invention are stacked.

  ADVANTAGE OF THE INVENTION According to this invention, a nonaqueous electrolyte battery and a nonaqueous electrolyte battery module with high heat dissipation can be provided.

1A is a perspective view for explaining an electrode body used in Embodiment 1 of the present invention, FIG. 1B is a perspective view showing a state in which the electrode body is housed in an exterior material, and FIG. 1C is an electrode body. It is a perspective view of the state accommodated in the exterior material. 2A is a perspective view of a heat radiating sheet as a heat radiating member used in the nonaqueous electrolyte battery according to Embodiment 1 of the present invention, and FIG. 2B is a side view of FIG. 2A. 3A is a perspective view of the nonaqueous electrolyte battery according to Embodiment 1 of the present invention, and FIG. 3B is a bottom view of the nonaqueous electrolyte battery according to Embodiment 1. FIG. It is a perspective view which shows the modification of the nonaqueous electrolyte battery of Embodiment 1 of this invention. It is a perspective view which shows the other modification of the nonaqueous electrolyte battery of Embodiment 1 of this invention. It is a perspective view which shows the modification of the thermal radiation sheet used for the nonaqueous electrolyte battery of Embodiment 1 of this invention. It is a perspective view which shows the other modification of the thermal radiation sheet used for the nonaqueous electrolyte battery of Embodiment 1 of this invention. FIG. 8A is a perspective view showing another modification of the nonaqueous electrolyte battery according to Embodiment 1 of the present invention, and FIG. 8B is a bottom view of this modification. It is a perspective view which shows the other modification of the nonaqueous electrolyte battery of Embodiment 1 of this invention. It is a perspective view which shows the other modification of the nonaqueous electrolyte battery of Embodiment 1 of this invention. It is a bottom view of the nonaqueous electrolyte battery of Embodiment 2 of the present invention. It is sectional drawing of the nonaqueous electrolyte battery module of Embodiment 4 of this invention. 1 is a perspective view of a nonaqueous electrolyte battery described in Patent Document 1. FIG.

  The non-aqueous electrolyte battery according to the present invention includes a battery element, a flexible exterior material containing the battery element, an electrode lead terminal portion drawn out from the exterior material, and a heat dissipation member in contact with the exterior material. And. In addition, the outer periphery of the exterior material is formed in a rectangular shape, and the outer periphery of the exterior material is joined with a predetermined width on three sides other than the one side where the valley is folded to form a sealing portion. The electrode lead terminal portion is drawn out from the sealed portion facing the folded one side, and the heat dissipation member is a sheet-like material provided with a sheet-like metal member and a resin member covering at least the outer periphery of the metal member Alternatively, it is formed of a sheet-like material containing a resin and thermally conductive inorganic particles.

  Since the nonaqueous electrolyte battery of the present invention includes a heat dissipation member that is in contact with the exterior material, it has high heat dissipation. Moreover, when the said heat radiating member is equipped with the resin member which covers at least the outer peripheral part of a metal member, it can prevent that a heat radiating member and the electrode lead terminal part pulled out outside from the exterior material are electrically short-circuited. . Furthermore, even if the heat radiating member is a sheet-like material containing a resin and thermally conductive inorganic particles, when the thermally conductive inorganic particles are insulating particles, a short circuit can be prevented in the same manner as described above.

  It is preferable that the said heat radiating member is a heat radiating sheet provided with the metal sheet and the resin sheet joined to both the main surfaces of the said metal sheet. Thereby, it can prevent more effectively that a heat dissipation sheet and the electrode lead terminal part withdraw | derived outside from the exterior material are electrically short-circuited.

  Moreover, it is preferable that the edge part of sealing parts other than the sealing part from which the said electrode lead terminal part is pulled out is covered with the folding | returning part of the said thermal radiation sheet. Also by this, it is possible to more effectively prevent the heat dissipation sheet and the electrode lead terminal portion drawn out from the exterior material from being electrically short-circuited, and to improve the strength of the sealing portion.

  The heat dissipation member includes a metal sheet and a resin portion that covers outer peripheral portions of both main surfaces of the metal sheet, and is inside the outer peripheral portion and on at least the main surface of the metal sheet on the exterior material side. It is preferable that a heat conductive adhesive is disposed. Thereby, while being able to improve the heat dissipation of the nonaqueous electrolyte battery of this invention more, the joining strength of a heat radiating member and exterior material can be improved.

  The heat dissipating member includes a metal sheet and a lattice-shaped resin sheet bonded to both main surfaces of the metal sheet, the inner side of the lattice of the resin sheet and at least the exterior material side of the metal sheet It is preferable that a heat conductive adhesive is disposed on the main surface. This can also improve the heat dissipation of the nonaqueous electrolyte battery of the present invention and improve the bonding strength between the heat dissipation member and the exterior material.

  The sealing portion other than the sealing portion from which the electrode lead terminal portion is drawn can be further wound around and fixed to the support member. Thereby, the vibration resistance and impact resistance of the nonaqueous electrolyte battery of the present invention can be improved, and the size of the battery in the width direction can be reduced.

  Moreover, the non-aqueous electrolyte battery module of the present invention is formed by laminating a plurality of the non-aqueous electrolyte batteries of the present invention. Since the nonaqueous electrolyte battery module of the present invention has a plurality of nonaqueous electrolyte batteries of the present invention having high heat dissipation, the heat dissipation of the battery module as a whole can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, in FIGS. 1-12, the same code | symbol is attached | subjected to the same part and the overlapping description may be abbreviate | omitted.

(Embodiment 1)
First, a non-aqueous electrolyte battery according to an embodiment of the present invention will be described by taking a flat lithium ion secondary battery as an example. FIG. 1A is a perspective view for explaining an electrode body used in this embodiment, FIG. 1B is a perspective view showing a state in which the electrode body is housed in an exterior material, and FIG. 1C is an electrode body as an exterior material. It is a perspective view of the stored state.

  In FIG. 1A, an electrode body 10 included in a battery element is produced by laminating a rectangular positive electrode 11 and a rectangular negative electrode 12 with a rectangular separator 13 interposed therebetween. A positive electrode lead terminal 11 a is provided at one end of the positive electrode 11, and a negative electrode lead terminal 12 a is provided at one end of the negative electrode 12.

  In FIG. 1B, the flexible rectangular exterior material 14 is valley-folded and is composed of a first exterior surface 14a and a second exterior surface 14b. An electrode housing portion 15 is formed on the first exterior surface 14a by deep drawing. Each positive electrode lead terminal 11a (FIG. 1A) and each negative electrode lead terminal 12a (FIG. 1A) are overlapped and welded to form a positive electrode lead terminal portion 16a and a negative electrode lead terminal portion 16b, respectively.

  In FIG. 1C, the electrode body 10 is accommodated in a space portion (electrode accommodating portion 15) formed by the first exterior surface 14a and the second exterior surface 14b that are valley-folded together with the electrolytic solution. Further, among the outer periphery of the exterior material 14, three sides other than the one side where the valley is folded are joined with a predetermined width to form the sealing portions 17 a, 17 b and 17 c. The positive electrode lead terminal portion 16a and the negative electrode lead terminal portion 16b are drawn to the outside from a sealing portion 17c facing one side of the exterior material 14 that is valley-folded.

  The positive electrode 11 is obtained by applying a positive electrode mixture paste obtained by sufficiently adding a solvent to a mixture containing a positive electrode active material, a positive electrode conductive additive, a positive electrode binder, and the like on both surfaces of the positive electrode current collector. After drying, the positive electrode mixture layer can be formed by controlling to a predetermined thickness and a predetermined electrode density.

Examples of the positive electrode active material include lithium cobalt oxides such as LiCoO ₂ , lithium manganese oxides such as LiMn ₂ O ₄ , lithium nickel oxides such as LiNiO _2, etc., which can occlude and release lithium ions. If it is, it will not be limited to these.

  The positive electrode current collector is not particularly limited as long as it is an electron conductor that is substantially chemically stable in the battery. As the positive electrode current collector, for example, an aluminum foil or the like is used.

  The negative electrode 12 was prepared by applying a negative electrode mixture paste obtained by sufficiently adding a solvent to a mixture containing a negative electrode active material, a negative electrode conductive additive, a negative electrode binder, and the like on both surfaces of the negative electrode current collector. After drying, the negative electrode mixture layer can be formed by controlling to a predetermined thickness and a predetermined electrode density.

  Examples of the negative electrode active material include carbon materials such as natural graphite or artificial graphite such as massive graphite, flaky graphite, and earthy graphite, but are not limited thereto as long as lithium ions can be occluded / released. .

  The negative electrode current collector is not particularly limited as long as it is an electron conductor that is substantially chemically stable in the constituted battery. For example, a copper foil or the like is used as the negative electrode current collector.

  As the separator 13, an insulating microporous film having a large ion permeability and a predetermined mechanical strength is used. Moreover, what has the function to block | close a micropore and to raise resistance above a fixed temperature (100-140 degreeC) is preferable from the point of the safety | security improvement of a battery. Specifically, as the separator, a sheet, a nonwoven fabric, a woven fabric, or an olefin-based particle made of an olefin-based polymer or glass fiber such as polypropylene and polyethylene having organic solvent resistance and hydrophobicity is fixed with an adhesive. A porous body layer or the like is used.

  As the exterior material 14, a laminated film in which a metal layer such as aluminum and a thermoplastic resin layer are laminated can be used. Thereby, sealing part 17a, 17b, 17c can be joined reliably by heat welding.

Examples of the electrolyte include vinylene carbonate (VC), propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and methyl ethyl carbonate (MEC). the organic solvents such as γ- butyrolactone to one or more kinds mixed solvent, for example, at least one of lithium selected from _{LiClO 4, LiPF 6, LiBF 4} , LiAsF 6, LiSbF 6, LiCF 3 SO 3 , etc. An electrolytic solution in which a salt is dissolved may be used. The concentration of Li ions in the electrolytic solution may be 0.5 to 1.5 mol / L.

  2A is a perspective view of a heat radiating sheet as a heat radiating member used in the nonaqueous electrolyte battery of the present embodiment, and FIG. 2B is a side view of FIG. 2A. 2A and 2B, the heat dissipation sheet 18 is formed of a metal sheet 18c as a sheet-like metal member, and resin sheets 18a and 18b as resin members joined to both main surfaces of the metal sheet 18c. The metal sheet 18c is formed of a metal such as aluminum, copper, nickel, iron, and stainless steel. As the metal sheet 18c, one type of metal sheet may be used, or two or more types of metal sheets may be laminated and used. Although the thickness of the metal sheet 18c varies depending on the size and thickness of the nonaqueous electrolyte battery, it can be set to, for example, 200 to 500 μm.

  The resin sheets 18a and 18b are made of a thermoplastic resin such as polyethylene or polypropylene, for example. As the resin sheets 18a and 18b, one type of resin sheet may be used, or two or more types of resin sheets may be laminated and used. The thickness of the resin sheets 18a and 18b varies depending on the size and thickness of the nonaqueous electrolyte battery, but can be set to, for example, 5 to 30 μm.

  FIG. 3A is a perspective view of the nonaqueous electrolyte battery of this embodiment, and FIG. 3B is a bottom view of the nonaqueous electrolyte battery of this embodiment. 3A and 3B, the heat radiating sheet 18 shown in FIGS. 2A and 2B is joined to one main surface of the exterior member 14. The exterior material 14 and the heat dissipation sheet 18 are integrated by, for example, bonding by thermocompression bonding or bonding by an adhesive. If the resin sheets 18a and 18b are formed of the above-described thermoplastic resin, the exterior material 14 and the heat dissipation sheet 18 can be efficiently joined by thermocompression bonding.

  The arrows shown in FIG. 3B represent a heat radiation route through which heat is conducted from the exterior material 14 through the heat radiation sheet 18. The heat generated in the exterior material 14 is conducted from the resin sheet 18a to the metal sheet 18c, and finally released to the outside from the end of the metal sheet 18c.

  Further, in the nonaqueous electrolyte battery shown in FIGS. 3A and 3B, the entire surfaces of both main surfaces of the metal sheet 18 c of the heat radiating sheet 18 are covered with the resin sheets 18 a and 18 b. It is possible to more effectively prevent the positive electrode lead terminal portion 16a and the negative electrode lead terminal portion 16b drawn from the outside from being electrically short-circuited.

  FIG. 4 is a perspective view showing a modification of the nonaqueous electrolyte battery of the present embodiment. The non-aqueous electrolyte battery shown in FIG. 4 has substantially the same configuration as the non-aqueous electrolyte battery shown in FIGS. 3A and 3B except that the heat dissipation sheet 18 is disposed on the electrode housing portion 15 side of the exterior material 14. The arrows shown in FIG. 4 represent a heat radiation route through which heat is conducted from the exterior material 14 through the heat radiation sheet 18. The heat generated in the exterior material 14 is conducted from the resin sheet 18a to the metal sheet 18c, and finally released to the outside from the end of the metal sheet 18c.

  FIG. 5 is a perspective view showing another modification of the nonaqueous electrolyte battery of the present embodiment. The nonaqueous electrolyte battery shown in FIG. 5 is substantially the same as the nonaqueous electrolyte battery shown in FIGS. 3A and 3B except that the end portions of the sealing portions 17a and 17b are covered with the folded portion 18d of the heat dissipation sheet 18. It is the same composition. In this modification, heat dissipation can be improved, short circuit can be prevented, and the strength of the sealing portion can be improved.

  FIG. 6 is a perspective view showing a modification of the heat dissipation sheet used in the nonaqueous electrolyte battery of the present embodiment. In FIG. 6, the heat radiating sheet 18 includes a metal sheet 18c and a resin portion 18e covering the outer peripheral portions of both main surfaces of the metal sheet 18c, and is inside the resin portion 18e and above both main surfaces of the metal sheet 18c. Is provided with a heat conductive adhesive 18f. In the nonaqueous electrolyte battery using the heat dissipation sheet of this modification, heat dissipation can be improved, short circuit can be prevented, and the bonding strength between the heat dissipation sheet and the exterior material can be improved.

  The resin part 18e is formed from thermoplastic resins, such as polyethylene and a polypropylene, for example. As the resin portion 18e, one type of resin may be used, or two or more types of resins may be laminated and used. The thickness of the resin portion 18e varies depending on the size and thickness of the nonaqueous electrolyte battery, but can be set to, for example, 5 to 30 μm.

  As the thermally conductive adhesive 18f, for example, a room temperature curable silicone adhesive that does not cause thermal damage to the battery body, such as “1225B” manufactured by ThreeBond Co., Ltd. and “KE-3467” manufactured by Shin-Etsu Chemical Co., Ltd. Can be used.

  FIG. 7 is a perspective view showing another modification of the heat dissipation sheet used in the nonaqueous electrolyte battery of the present embodiment. In FIG. 7, the heat dissipation sheet 18 includes a metal sheet 18c and a lattice-shaped resin sheet 18g bonded to both main surfaces of the metal sheet 18c. A heat conductive adhesive 18f is disposed on the main surface. In the nonaqueous electrolyte battery using the heat dissipation sheet of this modification, heat dissipation can be improved, short circuit can be prevented, and the bonding strength between the heat dissipation sheet and the exterior material can be improved.

  The resin sheet 18g is formed of a thermoplastic resin such as polyethylene or polypropylene, for example. As the resin sheet 18g, one type of resin may be used, or two or more types of resins may be laminated and used. The thickness of the resin sheet 18g varies depending on the size and thickness of the nonaqueous electrolyte battery, but can be set to, for example, 5 to 30 μm. Further, the size of the lattice of the resin sheet 18g is not limited, and can be set as appropriate according to the size of the nonaqueous electrolyte battery.

  FIG. 8A is a perspective view showing another modified example of the nonaqueous electrolyte battery of the present embodiment, and FIG. 8B is a bottom view of this modified example. 8A and 8B, the sealing portions 17a and 17b other than the sealing portion 17c from which the positive electrode lead terminal portion 16a and the negative electrode lead terminal portion 16b of the nonaqueous electrolyte battery 20 are drawn are circular and have a hollow rod shape. The support members 19a and 19b formed in a (cylindrical shape) are wound and fixed. The sealing portions 17a and 17b and the support members 19a and 19b are bonded and fixed using, for example, a double-sided tape or an adhesive. The diameters of the support members 19 a and 19 b in the thickness direction of the exterior material 14 are set to be approximately equal to the thickness of the exterior material 14. Except for the above, the configuration is substantially the same as the nonaqueous electrolyte battery shown in FIGS. 3A and 3B.

  The arrow shown in FIG. 8B represents a heat radiation route through which heat is conducted from the exterior material 14 through the heat radiation sheet 18. The heat generated in the exterior material 14 is conducted from the resin sheet 18a to the metal sheet 18c, and finally released to the outside from the end of the metal sheet 18c.

  FIG. 9 is a perspective view showing another modification of the nonaqueous electrolyte battery of the present embodiment. The nonaqueous electrolyte battery shown in FIG. 9 has substantially the same configuration as the nonaqueous electrolyte battery shown in FIGS. 8A and 8B except that the heat dissipation sheet 18 is disposed on the electrode housing portion 15 side of the exterior material 14. The arrows shown in FIG. 9 represent a heat radiation route through which heat is conducted from the exterior material 14 through the heat radiation sheet 18. The heat generated in the exterior material 14 is conducted from the resin sheet 18a to the metal sheet 18c, and finally released to the outside from the end of the metal sheet 18c.

  FIG. 10 is a perspective view showing another modification of the nonaqueous electrolyte battery of the present embodiment. The nonaqueous electrolyte battery shown in FIG. 10 has substantially the same configuration as the nonaqueous electrolyte battery shown in FIG. 9 except that the end of the heat dissipation sheet 18 is in contact with the support members 19a and 19b. The arrows shown in FIG. 10 represent a heat radiation route through which heat is conducted from the exterior material 14 through the heat radiation sheet 18. The heat generated in the exterior material 14 is conducted from the resin sheet 18a to the metal sheet 18c, and finally released to the outside from the end of the metal sheet 18c and the support members 19a and 19b.

(Embodiment 2)
Next, another embodiment of the nonaqueous electrolyte battery of the present invention will be described. FIG. 11 is a bottom view of the nonaqueous electrolyte battery of the present embodiment.

  In the nonaqueous electrolyte battery of FIG. 11, two exterior members 24 and 25 are overlapped via the heat dissipation sheet 18, and the sealing portions 17 a and 17 b of the exterior bodies 24 and 25 are each one support member. It is wound around 19a and 19b and fixed. Moreover, the edge part of the thermal radiation sheet | seat 18 is contacting the supporting members 19a and 19b, respectively. As the exterior materials 24 and 25, the same materials as the exterior material 14 described in the first embodiment can be used. Moreover, as the heat radiating sheet 18, the same one as the heat radiating sheet 18 described in the first embodiment can be used.

  The arrows shown in FIG. 11 represent a heat radiation route through which heat is conducted from the exterior materials 24 and 25 through the heat radiation sheet 18. The heat generated in the exterior materials 24 and 25 is conducted to the heat radiating sheet 18 and finally released to the outside from the support members 19a and 19b.

  In the present embodiment, the heat dissipation of a nonaqueous electrolyte battery in which two unit cells are combined can be improved, and the number of components can be reduced because the heat dissipation sheet can be shared by the two unit cells.

(Embodiment 3)
Next, another embodiment of the nonaqueous electrolyte battery of the present invention will be described. In this embodiment, it replaces with the heat radiating sheet used in Embodiment 1 and Embodiment 2, and Embodiment 1 and Embodiment 2 except having used the sheet-like thing containing resin and a heat conductive inorganic particle as a heat radiating sheet. The configuration is almost the same as that of the nonaqueous electrolyte battery.

  As the resin, an organic polymer compound having a glass transition temperature of 50 ° C. or lower is used in order to increase the flexibility of the sheet-like material. Specifically, poly (meth) acrylate polymer compounds (acrylic rubber) containing butyl acrylate, 2-ethylhexyl acrylate, etc. as main raw material components, and polymer compounds having a polydimethylsiloxane structure as the main structure (Silicone resin), a polymer compound having a polyisoprene structure as a main structure (isoprene rubber), a polymer compound having chloroprene as a main raw material component (neoprene rubber), a polymer compound having a polybutadiene structure as a main structure (butadiene rubber) ) And other flexible organic polymer compounds. Among these, a poly (meth) acrylic acid ester-based polymer compound is preferably used because it is particularly easy to obtain high flexibility and is excellent in chemical stability and processability. As the resin, one type of resin may be used, or two or more types of resins may be mixed and used.

  In order to increase the thermal conductivity of the sheet-like material, graphite particles having high thermal conductivity or metal particles such as aluminum, copper, nickel, iron, and stainless steel can be used as the thermally conductive inorganic particles. Also, alumina (thermal conductivity: 21-40 W / mK), magnesium oxide (thermal conductivity: 60 W / mK), aluminum nitride (thermal conductivity: 70-200 W / mK), boron nitride (thermal conductivity: 40- 60 W / mK), silicon nitride (thermal conductivity: 25 to 155 W / mK), or other particles having a thermal conductivity of 20 W / mK or more may be used.

  The particle shape of the heat conductive inorganic particles is not particularly limited, but particles having a shape that is advantageous for orientation in a certain direction such as a scale shape, a plate shape, a spindle shape, or a rod shape are used, and this is constant within the sheet. When oriented in the direction, heat transfer in the direction in which the particles are oriented (for example, in-plane direction or thickness direction of the sheet) can be enhanced.

  As the heat-dissipating sheet of the present embodiment, a material in which the heat conductive inorganic particles are mixed and dispersed in the resin can be used. The mixing ratio of the resin and the thermally conductive inorganic particles is not particularly limited, but it is preferable that the thermally conductive inorganic particles are in the range of 30 to 70% by volume based on the volume of the mixture.

  Although the thickness of the heat dissipation sheet used in the present embodiment varies depending on the size and thickness of the nonaqueous electrolyte battery, it can be, for example, 10 μm to 2 mm.

(Embodiment 4)
Subsequently, an embodiment of the nonaqueous electrolyte battery module of the present invention will be described. The nonaqueous electrolyte battery module of the present embodiment is obtained by stacking a plurality of the nonaqueous electrolyte batteries described in the first embodiment.

  FIG. 12 is a cross-sectional view of the nonaqueous electrolyte battery module of the present embodiment. In FIG. 12, a plurality of nonaqueous electrolyte batteries 20 shown in FIGS. 3A and 3B of Embodiment 1 are stacked and housed inside the exterior body 30. The end of the heat dissipation sheet 18 of each nonaqueous electrolyte battery 20 is in contact with the inner surface of the exterior body 30. Thereby, the heat conducted to the heat dissipation sheet 18 can be released from the exterior body 30 to the outside. For this reason, it is preferable to form the exterior body 30 with a material with high thermal conductivity, such as aluminum, copper, nickel, iron, and stainless steel.

  The nonaqueous electrolyte battery module of the present invention can easily stack any number of nonaqueous electrolyte batteries having high heat dissipation properties, and can also improve the heat dissipation properties of the entire battery module.

  Although the nonaqueous electrolyte battery module of the present embodiment has a plurality of nonaqueous electrolyte batteries described in the first embodiment, the plurality of nonaqueous electrolyte batteries described in the second or third embodiment may be stacked.

  As described above, the present invention can provide a nonaqueous electrolyte battery and a nonaqueous electrolyte battery module with high heat dissipation. Therefore, the non-aqueous electrolyte battery and the non-aqueous electrolyte battery module of the present invention can be widely used as a power source for automobiles and motorcycles requiring high heat dissipation, a power source for moving bodies such as robots, and the like.

DESCRIPTION OF SYMBOLS 10 Electrode body 11 Positive electrode 11a Positive electrode lead terminal 12 Negative electrode 12a Negative electrode lead terminal 13 Separator 14, 24, 25 Exterior material 14a First exterior surface 14b Second exterior surface 15 Electrode storage part 16a Positive electrode lead terminal part 16b Negative electrode lead terminal part 17a, 17b, 17c Sealing part 18 Heat radiation sheet 18a, 18b Resin sheet 18c Metal sheet 18d Folded part 18e Resin part 18f Thermally conductive adhesive 18g Grid-like resin sheet 20 Nonaqueous electrolyte battery 30 Exterior body

Claims (7)

A non-aqueous electrolyte battery comprising: a battery element; a flexible exterior material housing the battery element; an electrode lead terminal portion drawn out from the exterior material; and a heat dissipation member in contact with the exterior material. And
The outer periphery of the exterior material is formed in a rectangular shape,
Of the outer periphery of the exterior material, three sides other than the one side that is valley-folded are joined with a predetermined width to form a sealing portion,
The electrode lead terminal portion is drawn out from the sealing portion facing the one side that is folded into the valley,
The heat dissipating member is a sheet-like material including a sheet-like metal member and a resin member covering at least an outer peripheral portion of the metal member, or a sheet-like material including a resin and thermally conductive inorganic particles. Non-aqueous electrolyte battery.   The non-aqueous electrolyte battery according to claim 1, wherein the heat radiating member is a heat radiating sheet including a metal sheet and a resin sheet bonded to both main surfaces of the metal sheet.   The nonaqueous electrolyte battery according to claim 2, wherein an end portion of the sealing portion other than the sealing portion from which the electrode lead terminal portion is drawn is covered with a folded portion of the heat dissipation sheet.   The heat dissipation member includes a metal sheet and a resin portion that covers outer peripheral portions of both main surfaces of the metal sheet, and is inside the resin portion and on at least the main surface of the metal sheet on the exterior material side. The nonaqueous electrolyte battery according to claim 1, wherein a heat conductive adhesive is disposed.   The heat dissipating member includes a metal sheet and a lattice-shaped resin sheet bonded to both main surfaces of the metal sheet, the inner side of the lattice of the resin sheet and at least the main material side of the metal sheet. The nonaqueous electrolyte battery according to claim 1, wherein a heat conductive adhesive is disposed on the surface.   The nonaqueous electrolyte battery according to claim 1, wherein a sealing portion other than the sealing portion from which the electrode lead terminal portion is drawn is further wound around and fixed to a support member.   A nonaqueous electrolyte battery module, wherein a plurality of the nonaqueous electrolyte batteries according to claim 1 are stacked.

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