JP5609799B2 - Battery and battery case - Google Patents

Description

  The present invention relates to a battery and a battery case.

  Conventionally, a battery system including a heating element is known (see, for example, Patent Document 1).

  Patent Document 1 includes a secondary battery, and a heater (heating element) that is connected to a positive terminal and a negative terminal of the secondary battery and is disposed close to or in close proximity to the secondary battery (power generation element). A battery system is disclosed. In this battery system, by heating the secondary battery by generating heat with the power from the secondary battery, the charging performance and output performance of the secondary battery are sufficiently exhibited even in a low temperature environment. In addition, although the patent document 1 describes that the heater (heating element) is arranged close to or in close proximity to the secondary battery (power generation element), the specific arrangement position and mounting structure of the heater are described. Not listed. Here, in the case where the heating element is disposed close to or in close proximity to the battery (power generation element), a configuration in which the heating element is attached to the outer surface of the battery outer casing via an adhesive layer is conceivable.

WO2011 / 016497 Publication

  However, in the configuration of Patent Document 1, the heater (heating element) is attached to the outer surface of the exterior body of the secondary battery via an adhesive layer so that the heater is close to or in close contact with the secondary battery (power generation element). In the arrangement, the heater may be peeled off from the outer surface of the exterior body due to deterioration of the adhesive layer or deformation of the exterior body. In this case, there is a problem that the secondary battery (power generation element) cannot be efficiently heated by the heater (heating element).

  As for the use of the battery in a low temperature environment, in addition to the use in a cold region, there are cases where the battery is mounted on an artificial satellite or an airplane and exposed to a low temperature environment. When mounted on a moving body such as an artificial satellite or an airplane, it is desired to reduce the weight of the battery in addition to heating the power generation element by the heating element.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a battery and a battery exterior capable of efficiently heating a power generating element while reducing the weight. Is to provide a body.

Means for Solving the Problems and Effects of the Invention

  A battery according to a first aspect of the present invention includes a power generation element, a heating element layer that houses the power generation element and that heats the power generation element, and an exterior body made of a laminate film in which a metal layer is laminated. ing.

  In the battery according to the first aspect of the present invention, when a metal case is used as an exterior body by providing an exterior body made of a laminate film in which a heating element layer for heating a power generating element is laminated, as described above. The weight can be reduced as compared with the heating element layer, and the heating element layer is provided by being laminated inside the exterior body made of a laminate film, so that the heating element layer can be prevented from being detached from the exterior body. . Thereby, the power generation element accommodated in the exterior body can be efficiently heated by the heating element layer while reducing the weight. Unlike the case where the heating element is attached to the outer surface of the exterior body by laminating the heating element layer inside the exterior body made of a laminate film, the heating element layer is the same as other layers in the manufacturing process of the laminate film. Thus, the heating element layer can be easily provided.

  In the battery according to the first aspect, preferably, the exterior body includes a welding resin layer on each of the inner surface and the outer surface, and the heating element layer is provided between the welding resin layer and the metal layer on the outer surface. ing. If comprised in this way, since a heat generating body layer is provided outside a metal layer, the wiring for supplying electric power to a heat generating body layer can be formed easily. Further, by providing a welding resin layer on each of the inner surface and the outer surface of the exterior body, it is possible to perform welding with a part of the inner surface facing a part of the outer surface.

  In this case, preferably, the exterior body includes a thermal diffusion layer that is provided between the heating element layer and the inner surface of the exterior body and diffuses heat from the heating element layer and transmits the heat to the power generation element. And a thickness of 50 μm or more and 400 μm or less. The thermal diffusion layer of the present invention is not limited to a single layer, but is a broad concept including a plurality of layers made of the same or different materials. If comprised in this way, since a heat | fever can be diffused by a thermal diffusion layer and can be disperse | distributed to the whole power generation element, the whole power generation element can be heated uniformly.

  In the structure in which the heating element layer is provided between the welding resin layer and the metal layer on the outer surface, preferably, the insulating layer having a thickness of 5 μm or more and 50 μm or less is provided between the heating element layer and the metal layer. A heat-resistant layer is provided. If comprised in this way, since a heat generating body layer and a metal layer are arrange | positioned on both sides of the insulating heat resistant layer which is hard to soften with heat, it is suppressed effectively that a heat generating body layer and a metal layer contact. As a result, it is possible to suppress a short circuit between the heating element layer and the metal layer.

  In the battery according to the first aspect, preferably, the heating element layer and the metal layer are formed of the same layer. If comprised in this way, while being able to simplify the layer structure of the exterior body which consists of a laminate film compared with the case where a heat generating body layer and a metal layer are provided separately, the thickness of an exterior body becomes large. Thus, the battery can be reduced in size.

  The battery exterior body according to the second aspect of the present invention comprises a laminate film that houses a power generation element and that has a heating element layer for heating the power generation element and a metal layer laminated inside.

  In the battery outer body according to the second aspect of the present invention, as described above, the heating element layer for heating the power generating element is formed by the laminated film laminated inside, so that the battery outer casing of the metal case is formed. In addition, the weight can be reduced, and the heating element layer is provided so as to be laminated inside, so that the heating element layer can be prevented from being detached from the battery exterior body. Thereby, the power generation element housed inside can be efficiently heated by the heating element layer while reducing the weight. Unlike the case where the heating element is attached to the outer surface of the battery outer casing by laminating the heating element layer inside the battery outer casing made of the laminate film, the same process as other layers in the manufacturing process of the laminate film Since the heating element layer can be formed (laminated), the heating element layer can be easily provided.

  In the battery case according to the second aspect, preferably, the heating element layer and the metal layer are formed of the same layer. If comprised in this way, while being able to simplify the layer structure of the battery exterior body which consists of a laminate film compared with the case where a heat generating body layer and a metal layer are provided separately, the thickness of the battery exterior body is reduced. It is possible to reduce the size of the battery by suppressing the increase.

It is the perspective view which showed the whole structure of the battery by 1st Embodiment of this invention. It is the top view which showed the front side of the battery by 1st Embodiment of this invention. 1 is a plan view showing a back side of a battery according to a first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line 400-400 in FIGS. 2 and 3. It is sectional drawing which showed the layer structure of the exterior body of the battery by 1st Embodiment of this invention. It is a figure for demonstrating the thermal-diffusion state of the exterior body of the battery by 1st Embodiment of this invention. 1 is a circuit diagram showing a heater circuit of a battery according to a first embodiment of the present invention. It is the perspective view which showed the whole structure of the battery by 2nd Embodiment of this invention. FIG. 6 is a plan view of a battery according to a second embodiment of the present invention. It is sectional drawing which showed the layer structure of the exterior body of the battery by 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view showing a modification of the battery according to the first embodiment of the present invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-7, the structure of the battery 100 by 1st Embodiment of this invention is demonstrated.

  The battery 100 by 1st Embodiment of this invention is a lithium ion battery, as shown in FIGS. 1-4, from the exterior body 1 which consists of laminate films, and the both ends of the longitudinal direction (Y direction) of the battery 100 A positive electrode terminal 2 and a negative electrode terminal 3 each projecting outward are provided. Further, as shown in FIGS. 2 to 4, the power generation element 4 and an electrolyte solution (not shown) are accommodated in the exterior body 1. The exterior body 1 is an example of the “battery exterior body” in the present invention.

  The exterior body 1 is formed in a cylindrical shape by overlapping and welding the end portion of the inner surface of the laminate film and the end portion of the outer surface facing each other. Moreover, as shown in FIGS. 1-3, the exterior body 1 is the welding part 1a formed by welding in the state which inner surfaces oppose in the both ends of the longitudinal direction (Y direction) of the battery 100. FIG. have. The welded portions 1a at both ends of the battery 100 are welded with the positive electrode terminal 2 and the negative electrode terminal 3 sandwiched therebetween, respectively. Further, as shown in FIG. 5, the exterior body 1 includes a PE welding layer 11, a PET layer 12, an aluminum layer 13, a PET layer 14, a heater layer 15, and a heater layer 15 from the inner side where the power generation element 4 is disposed to the outer side. The PE welding layer 16 has a laminate structure in which the PE welding layers 16 are laminated in this order. Further, an adhesive layer (adhesive, adhesive) that joins the metal layer (aluminum layer 13 and heater layer 15) and the resin layer (PET layer 12, PET layer 14 and PE weld layer 16) to each other. Film).

  The PE weld layers 11 and 16 are made of polyethylene and have a melting point of about 130 ° C. The PE weld layers 11 and 16 have a thermal conductivity of about 0.25 W / (m · K) or more and about 0.34 W / (m · K) or less. The PE weld layers 11 and 16 provided on the inner surface and the outer surface of the outer package 1 have a thickness of about 50 μm or more and about 200 μm or less. The PE weld layers 11 and 16 are examples of the “welded resin layer” in the present invention.

  The PET layers 12 and 14 are made of insulating polyethylene terephthalate having heat resistance, and have a melting point of about 260 ° C. higher than the melting point (about 130 ° C.) of the PE weld layer 11. The PET layers 12 and 14 have a thermal conductivity of about 0.2 W / (m · K) or more and about 0.5 W / (m · K) or less. The PET layers 12 and 14 have a thickness of about 5 μm or more and about 50 μm or less. The PET layer 14 is an example of the “insulating heat resistant layer” in the present invention.

  The aluminum layer 13 is made of an aluminum foil having a thickness of about 4 μm or more and about 100 μm or less, and is laminated inside the exterior body 1 made of a laminate film. The aluminum layer 13 has a function of blocking gas and liquid from the inside and outside of the exterior body 1. The aluminum layer 13 is an example of the “metal layer” in the present invention.

  The heater layer 15 is made of copper foil and is provided by being laminated inside the exterior body 1 made of a laminate film. The heater layer 15 is an example of the “heating element layer” in the present invention. The heater layer 15 is disposed between the PE weld layer 16 and the aluminum layer 13 on the outer surface of the exterior body 1. 2 and 3, the heater layer 15 is formed in a belt shape extending in the Y direction (longitudinal direction of the exterior body 1), and is substantially extended from the front side to the back side of the battery 100 while being folded back at a plurality of positions. It is provided throughout. The heater layer 15 is configured to generate heat by the electromotive force of the power generation element 4 housed in the exterior body 1 and to heat the power generation element 4.

The heater layer 15 has an output capacity at which the ratio of the capacity (Ah) of the battery 100 to the heater output (W) is about 1 W / Ah or more and about 20 W / Ah or less. The output value of the heater layer 15 is preferably 1 W or more and 1000 W or less. The heater layer 15 made of copper foil has an electrical resistivity (specific resistance) of 1 × 10 ⁻⁸ Ω · m to 3 × 10 ⁻⁸ Ω · m. Further, as shown in FIGS. 2 and 3, the heater layer 15 overlaps the power generation element 4 in the range of 20% or more of the projected area of the power generation element 4 housed inside on the front side and the back side of the battery 100. Are arranged as follows. Thereby, the power generation element 4 can be effectively heated by the heater layer 15. Further, the heater layer 15 is disposed substantially in the projection region of the power generation element 4 when viewed in plan. Thereby, since it can prevent that the part near the welding part 1a of the exterior body 1 in which the electric power generation element 4 is not arrange | positioned by the heater layer 15 is heated, the exterior body 1 is damaged by heating. Can be prevented. The belt-like heater layer 15 preferably has a width of 1 mm or more and 20 mm or less, and preferably has a thickness of 5 μm or more and 500 μm.

  In addition, as shown in FIGS. 1 to 3, in the heater layer 15, connection portions 15 a and 15 b provided at both ends are exposed to the outside on the front side and the back side of the battery 100, respectively. Specifically, openings 16a and 16b that expose the connection portions 15a and 15b to the outside are formed in portions corresponding to the connection portions 15a and 15b of the PE weld layer 16 on the outer surface of the exterior body 1, respectively. Yes. The heater layer 15 is configured to be connected to a heater circuit 5 (see FIG. 7) to be described later via connection portions 15a and 15b.

  By configuring the exterior body 1 as described above, the heat from the heater layer 15 causes the PE weld layer 11 and PET disposed between the heater layer 15 and the inner surface of the exterior body 1 as shown in FIG. It is diffused by the resin layers of the layer 12 and the PET layer 14 and transmitted to the power generation element 4. That is, the resin layer of the PE weld layer 11, the PET layer 12, and the PET layer 14, which has a lower thermal conductivity than the aluminum layer 13, diffuses heat from the heater layer 15 to the power generation element 4 while gradually diffusing heat. A resin layer 17 is formed. The heat of the heater layer 15 is transmitted toward the inside of the exterior body 1 while being gradually diffused by the PET layer 14, and is further diffused by the aluminum layer 13 having a thermal conductivity higher than that of the resin layer. Then, the heat diffused by the aluminum layer 13 is transmitted toward the inside of the exterior body 1 while being gradually diffused by the PET layer 12 and the PE weld layer 11, and is sufficiently diffused into the interior of the exterior body 1. It is transmitted to the stored power generation element 4. In the first embodiment, the thermal diffusion resin layer 17 composed of the PE weld layer 11, the PET layer 12, and the PET layer 14 preferably has a total thickness of about 50 μm or more and about 400 μm or less. The thermal diffusion resin layer 17 is an example of the “thermal diffusion layer” in the present invention.

  As an adhesive layer (adhesive, adhesive film, etc.) provided between a metal layer (aluminum layer 13 and heater layer 15) and a resin layer (PET layer 12, PET layer 14 and PE weld layer 16), ethylene- It is preferable to use methacrylic acid copolymer. In addition to ethylene-methacrylic acid copolymer, an adhesive layer made of acrylic, epoxy, rubber (silicone, EPDM) or the like may be used.

  Next, the heater circuit 5 that connects the heater layer 15 to the battery 100 will be described with reference to FIG.

  The heater layer 15 is connected to the battery 100 by the heater circuit 5, and when the voltage of the battery 100 is equal to or higher than a predetermined voltage, the heater layer 15 is turned on (heat generation state) when a current flows through the bypass circuit 51. It is configured. Specifically, the bypass electric circuit 51 is provided with switch means 52 including a transistor for opening and closing the bypass electric circuit 51. The switch means 52 is composed of a bipolar transistor, and closes the bypass electric circuit 51 (connected state) when the voltage of the battery 100 is equal to or higher than a predetermined voltage, and bypasses the electric circuit 51 when the voltage of the battery 100 is lower than the predetermined voltage. Is in an open state (a disconnected state). The switch means 52 is configured to be driven by a switch drive circuit 53. The switch drive circuit 53 is a drive that connects the connection point 51 a located on the opposite side of the switch means 52 with respect to the heater layer 15 and the connection point 51 b located on the opposite side of the connection point 51 a with respect to the switch means 52. The main electric circuit 531 is provided. In addition, the switch drive circuit 53 is connected to the branch circuit 532 branched from the connection point 531 a located in the middle of the drive main circuit 531, the voltage supply source 533 that supplies the reference voltage, and the branch circuit 532 and the voltage supply source 533. And a comparator 534. A first resistor 535 is provided between the connection point 51 a and the connection point 531 a of the driving main electric circuit 531. Further, a second resistor 536 is provided between the connection point 531a and the connection point 51b of the driving main electric circuit 531. The comparator 534 compares the voltage of the branch circuit 532 with the reference voltage of the voltage supply source 533, and when the voltage of the branch circuit 532 is equal to or higher than the reference voltage, the bypass circuit 51 closes the switch means 52 (connection). When the voltage of the branch circuit 532 is smaller than the reference voltage, the switch means 52 is configured to be driven to the off state so that the bypass circuit 51 is opened (disconnected). ing. Note that the switch means 52 is not limited to a bipolar transistor, and may be a field effect transistor (FET), a mechanical relay, or the like.

  The positive electrode terminal 2 and the negative electrode terminal 3 are made of aluminum and copper, respectively, and are provided so as to protrude outward through welded portions 1 a at both ends in the longitudinal direction (Y direction) of the outer package 1. The power generation element 4 is disposed between a positive electrode made of a metal foil (Al) coated with a positive electrode active material (not shown), a negative electrode made of metal foil (Cu) coated with a negative electrode active material, and the positive electrode and the negative electrode. The separator is formed by being wound in a state of being overlapped with each other.

  In 1st Embodiment, compared with the case where a metal case is used as the exterior body 1 by providing the exterior body 1 which consists of a laminate film by which the heater layer 15 which heats the electric power generation element 4 was laminated | stacked inside as mentioned above. While being able to achieve weight reduction, since the heater layer 15 is laminated | stacked and provided in the inside of the exterior body 1 which consists of laminate films, it can suppress that the heater layer 15 remove | deviates from the exterior body 1. FIG. . Thereby, the power generation element 4 accommodated in the exterior body 1 can be efficiently heated by the heater layer 15 while reducing the weight. Unlike the case where the heating element is attached to the outer surface of the exterior body 1 by laminating the heater layer 15 inside the exterior body 1 made of a laminate film, the heater is formed in the same manner as other layers in the manufacturing process of the laminate film. Since the layer 15 can be formed (laminated), the heater layer 15 can be easily provided.

  Further, in the first embodiment, as described above, the PE weld layers 11 and 16 are provided on the inner surface and the outer surface of the exterior body 1 respectively, and the heater layer 15 is replaced with the PE weld layer 16 and the aluminum layer on the outer surface. 13 is provided. If comprised in this way, since the heater layer 15 is provided in the outer side rather than the aluminum layer 13, the wiring for supplying electric power to the heater layer 15 can be formed easily. Further, by providing the PE welding layers 11 and 16 on the inner surface and the outer surface of the outer package 1, respectively, the inner surface end and the outer surface end can be welded to face each other.

  In the first embodiment, as described above, the heat diffusion resin that diffuses heat from the heater layer 15 between the heater layer 15 of the exterior body 1 and the inner surface of the exterior body 1 and transmits the heat to the power generation element 4. Layer 17 is provided. If comprised in this way, since the heat | fever can be diffused by the thermal diffusion resin layer 17 and can be disperse | distributed to the whole electric power generation element 4, the whole electric power generation element 4 can be heated uniformly. Further, when the thickness of the heat diffusion resin layer 17 is 50 μm or more and 400 μm or less, unlike the case where the thickness of the heat diffusion resin layer 17 is less than 50 μm, the heat diffusion resin layer 17 effectively diffuses heat. Thus, unlike the case where the thickness of the thermal diffusion resin layer 17 is larger than 400 μm, the distance from the heater layer 15 to the power generation element 4 is suppressed from being excessively increased. Heat can be effectively transferred to the element 4. As a result, the entire power generating element 4 can be heated uniformly and effectively.

  In the first embodiment, as described above, the insulating PET layer 14 having a thickness of 5 μm or more and 50 μm or less is provided between the heater layer 15 and the aluminum layer 13. If comprised in this way, since the heater layer 15 and the aluminum layer 13 are arrange | positioned on both sides of the insulating PET layer 14 which is hard to soften with heat, it is effective that the heater layer 15 and the aluminum layer 13 contact. It is suppressed. As a result, the heater layer 15 and the aluminum layer 13 can be prevented from being short-circuited. In addition, when the thickness of the PET layer 14 is 5 μm or more and 50 μm or less, unlike the case where the thickness of the PET layer 14 exceeds 50 μm, it is possible to suppress the increase in the thickness of the outer package 1 and the PET layer 14. Unlike the case where the thickness is less than 5 μm, it is possible to suppress the occurrence of defects such as pinholes. Thus, the heater layer 15 and the aluminum layer 13 are reliably short-circuited by the PET layer 14 having an appropriate thickness while suppressing the increase in the thickness of the outer package 1 and reducing the size of the battery 100. Can be suppressed.

(Second Embodiment)
Next, a second embodiment will be described. In the second embodiment, unlike the first embodiment in which the heater layer 15 as a heating element layer and the aluminum layer 13 as a metal layer are separately provided, the heater layer 215 as a heating element layer is a metal layer. A battery 200 having a configuration used also as will be described.

  As shown in FIGS. 8 to 10, the battery 200 according to the second embodiment of the present invention is a lithium ion battery, and includes an exterior body 201 made of a laminate film and the vicinity of both ends in the longitudinal direction (Y direction) of the battery 200. Are provided with a positive electrode terminal 2 and a negative electrode terminal 3 exposed to the outside. Further, in the exterior body 201, the power generation element 4 (see FIGS. 2 and 3) and an electrolyte solution (not shown) are accommodated, as in the first embodiment. The exterior body 201 is an example of the “battery exterior body” in the present invention.

  The exterior body 201 is formed in a cylindrical shape by overlapping and welding the end portions of the inner surface and the outer surface of the laminate film facing each other. Moreover, the exterior body 201 has a welded portion 201a formed by welding with both inner surfaces facing each other at both ends in the longitudinal direction (Y direction) of the battery 200. The welded portions 201a at both ends of the battery 200 are welded with the positive electrode terminal 2 and the negative electrode terminal 3 being sandwiched, respectively. Further, as shown in FIG. 10, the exterior body 201 has a PE welding layer 11, a PET layer 214, a heater layer 215, and a PE welding layer 16 laminated in this order from the inner side to the outer side where the power generation element 4 is arranged. Has a laminated structure.

  The PET layer 214 is made of insulating polyethylene terephthalate having heat resistance, and has a melting point of about 260 ° C. higher than the melting point (about 130 ° C.) of the PE weld layer 11. The PET layer 214 has a thermal conductivity of about 0.2 W / (m · K) or more and about 0.5 W / (m · K) or less. The PET layer 214 has a thickness of about 5 μm or more and about 50 μm or less.

The heater layer 215 is made of stainless steel foil (SUS foil) made of SUS304 or the like, and is laminated inside the exterior body 201 made of a laminate film. The heater layer 215 is configured such that the outer surface is in contact with the PE weld layer 16 and the inner surface is in contact with the PET layer 214. Also, as shown in FIG. 9, the heater layer 215 of the second embodiment is different from the heater layer 15 of the first embodiment having the structure of being folded back in a strip shape shown in FIG. 4 is provided so as to cover the entire surface on the outer peripheral side. Further, the heater layer 215 is configured to generate heat by the electromotive force of the power generation element 4 housed in the exterior body 201 and heat the power generation element 4. In addition, the heater layer 215 made of stainless steel foil has a higher electric resistance than the heater made of Cu foil, and therefore the flowing current is small. For this reason, it is possible to reduce power consumption. Specifically, the value obtained by dividing the electrical resistivity (Ω · m) of the heater layer 215 by the thickness (m) of the heater layer 215 is 0.01Ω or more and 0.5Ω or less. In this case, it is preferable that the electrical resistivity of the heater layer 215 is 15 × 10 ⁻⁸ Ω · m or more and 150 × 10 ⁻⁸ Ω · m or less, and the thickness of the heater layer 215 is 1 μm or more and 100 μm or less. From the viewpoint of workability, it is more preferable to use a SUS304 foil having an electrical resistivity of 71 × 10 ⁻⁸ Ω · m as the heater layer 215 and to have a thickness of 2 μm to 10 μm.

  Moreover, in 2nd Embodiment, since the heater layer 215 which consists of stainless steel foil is provided without the clearance gap over the exterior body 201 whole area, it has the function to interrupt | block the gas and liquid from the inside and the exterior of the exterior body 201. ing. That is, in the second embodiment, the heater layer 215 also serves as a metal layer, and the heating element layer and the metal layer are formed of the same layer. The heater layer 215 is an example of the “heating element layer” and the “metal layer” in the present invention.

  Further, as shown in FIGS. 8 and 9, the heater layer 215 has connection portions 215 a and 215 b (see FIG. 9) exposed to the outside from the vicinity of both ends in the longitudinal direction (Y direction) of the exterior body 201. doing. The connection part 215a is exposed by the opening part 16c of the PE welding layer 16 of the exterior body 1 on the surface side of the battery 200. As shown in FIG. 9, the connection portion 215 b is exposed through the opening portion 16 d of the PE welding layer 16 of the exterior body 1 on the back surface side of the battery 200. The connecting portion 215a is connected to the positive electrode terminal 2 via the switch 210, and the connecting portion 215b is directly connected to the negative electrode terminal 3. Thereby, the heater layer 215 is heated by the electromotive force of the power generation element 4 (see FIG. 9) when the switch 210 is switched to the connected state.

  By configuring the exterior body 201 as described above, heat from the heater layer 215 made of stainless steel foil provided in the entire exterior body 201 without any gap is disposed between the heater layer 215 and the inner surface of the exterior body 201. The PE welded layer 11 and the PET layer 214 are diffused by the resin layer and transmitted to the power generation element 4. That is, the resin layer of the PE weld layer 11 and the PET layer 214 constitutes a heat diffusion resin layer 217 that transmits heat to the power generation element 4 while gradually diffusing the heat of the heater layer 215. Further, in the second embodiment, the thermal diffusion resin layer 217 composed of the PE weld layer 11 and the PET layer 214 preferably has a total thickness of about 50 μm or more and about 400 μm or less. The thermal diffusion resin layer 217 is an example of the “thermal diffusion layer” in the present invention.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, as described above, the heater layer 215 as the heating element layer is provided throughout the exterior body 201 without any gap and is also used as the metal layer, whereby the heating element layer and the metal layer are provided separately from each other. As compared with the above, the layer configuration of the outer package 201 made of a laminate film can be simplified, and the battery 200 can be reduced in size by suppressing an increase in the thickness of the outer package 201. In the second embodiment, as in the first embodiment, the exterior body 201 made of a laminate film in which the heater layer 215 for heating the power generating element 4 is laminated is provided to reduce the weight. The power generation element 4 accommodated in the exterior body 201 can be efficiently heated by the heater layer 215.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said 1st Embodiment, the heater layer which consists of copper foil is shown as an example of the heat generating body layer of this invention, In the said 2nd Embodiment, the heater which consists of stainless steel foil as an example of the heat generating body layer of this invention Although a layer is shown, the present invention is not limited to this. In the present invention, for example, a heating element layer made of a material other than copper foil or stainless steel foil, such as a heating element layer made of aluminum foil, may be used. In addition, the heating element layer of the present invention is not limited to one made of a metal foil, and may be a heating element layer made of a conductive paint such as a silver paste. In this case, a heating element layer made of a conductive paint such as a silver paste may be laminated inside an outer package made of a laminate film by screen printing which is a kind of printing or a circuit forming method using a quantitative discharger. .

  Moreover, in the said 1st and 2nd embodiment, although the PE welding layer which consists of polyethylene was shown as an example of the welding resin layer of this invention, this invention is not limited to this. In the present invention, a welding resin layer made of polyolefin other than polyethylene (for example, polypropylene (PP)) may be used.

  Moreover, in the said 1st Embodiment, although the PET layer which consists of a polyethylene terephthalate was shown as an example of the insulating heat resistant layer of this invention, this invention is not limited to this. In the present invention, a polyester resin other than polyethylene terephthalate (PET), nylon, cellophane, or fluororesin (PTFE, PFA) can be used as long as it is an insulating material and has a heat resistance higher than that of the polyolefin used for the weld resin layer. Epoxy resin, silicone resin, polyamide resin, phenol resin, polyphenylene sulfide, polysulfone, polyarylate, polyetherimide, polyethersulfone, polyetheretherketone, polyamideimide, polyallylethernitrile, polybenzimidazole, polyethylene, etc. An insulating heat-resistant layer made of a material other than terephthalate may be used.

  Moreover, in the said 1st Embodiment, although the aluminum layer which consists of aluminum foil was shown as an example of the metal layer of this invention, this invention is not limited to this. In the present invention, even a metal layer made of a material other than aluminum, such as zinc, gold, silver, brass, tin, bronze, iron, copper, titanium, lead, nickel, platinum, magnesium, phosphor bronze, and stainless steel. Good.

  Moreover, in the said 1st Embodiment, although the thermal-diffusion resin layer which consists of PE welding layer 11, PET layer 12, and PET layer 14 was shown as an example of the thermal-diffusion layer of this invention, this invention is not limited to this. . In the present invention, for example, as shown in FIG. 11, in the configuration in which only the PE weld layer 11 (welded resin layer) is provided inside the metal layer (aluminum layer 13) of the exterior body 301, the PE weld layer 11 and The thermal diffusion layer 317 made of the PET layer 14 may be used. Further, in the configuration in which only the welding resin layer is provided between the heating element layer and the inner surface of the exterior body, a heat diffusion layer including one welding resin layer may be used.

  In the second embodiment, the heater layer 215 serving as the heating element layer is also used as the metal layer, so that the metal layer separate from the heater layer 215 is not provided. Not limited to. In the present invention, the heating element layer may be used as a metal layer, and a metal layer made of aluminum or the like may be further provided. Thereby, gas and a liquid can be more reliably interrupted | blocked by both a heat generating body layer and a metal layer. At this time, the metal layer made of aluminum or the like is preferably disposed on the inner side of the heating element layer.

  In the first and second embodiments, the heater layer as the heating element layer has been shown to generate heat by the electromotive force of the power generation element housed in the exterior body. Not limited. In the present invention, the heating element layer may be configured to generate heat with external power.

  Moreover, in the said 1st and 2nd embodiment, although the battery of this invention was shown to the example applied to the lithium ion battery which is 1 type of a non-aqueous electrolyte battery, this invention is not limited to this. The battery of the present invention may be applied to, for example, a non-aqueous electrolyte battery other than a lithium ion battery, or may be applied to an aqueous electrolyte battery such as a nickel metal hydride battery.

1, 201, 301 Exterior body (Battery exterior body)
4 Power generation elements 11, 16 PE welding layer (welding resin layer)
13 Aluminum layer (metal layer)
14 PET layer (insulating heat-resistant layer)
15 Heater layer (heating element layer)
17 Thermal diffusion resin layer (thermal diffusion layer)
100, 200 Battery 215 Heater layer (heating element layer, metal layer)
217 Thermal diffusion resin layer (thermal diffusion layer)
317 Thermal diffusion layer

Claims (5)

A power generation element;
A battery comprising: a heating element layer that houses the power generation element and that heats the power generation element; and an exterior body made of a laminate film in which a metal layer is laminated. The exterior body includes a welded resin layer on each of the inner surface and the outer surface,
The battery according to claim 1, wherein the heating element layer is provided between the welding resin layer on the outer surface and the metal layer. The exterior body includes a heat diffusion layer that is provided between the heating element layer and an inner surface of the exterior body and diffuses heat from the heating element layer and transmits the heat to the power generation element.
The battery according to claim 2, wherein the thermal diffusion layer has a thickness of 50 μm or more and 400 μm or less.   The battery according to claim 2, wherein an insulating heat-resistant layer having a thickness of 5 μm or more and 50 μm or less is provided between the heating element layer and the metal layer.   A battery exterior body comprising a laminate film which houses a power generation element and heats the power generation element and a metal layer laminated inside.

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