JP2013093151A - Battery case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery case that ensures sufficient electromagnetic wave shieldability, whose weight can be reduced, and that has excellent impact resistance and corrosion resistance.SOLUTION: A battery case includes a pair of case bodies coupled to each other with a hinge so as to be opened and closed. The case bodies accommodate a battery. The pair of case bodies has side walls formed by multi-layer blow molding into a structure having at least three layers including an outer resin layer formed with a resin material at the outer surface side of each case body and a conductive material layer formed with a material obtained by kneading a resin with a conductive material at the inner side of the outer resin layer. The side walls have a double-wall structure having: an outer wall and an inner wall each formed into the three-layer structure having the outer resin layer, the conductive material layer and an inner resin layer; and a hollow layer formed between the inner resin layers of the outer wall and the inner wall, having heat insulation effect, and capable of adjusting temperature in the case bodies.

Description

  The present invention relates to a battery case for housing a battery mounted on an electric vehicle, a hybrid electric vehicle, or the like.

  Conventionally, in a vehicle such as an electric vehicle, a large number of batteries such as battery modules and battery packs are mounted on the floor surface of the vehicle body, and each battery is electrically connected by a cable and is also made of iron or aluminum. It is attached to the vehicle body in a state of being housed in a battery case made of metal such as. For example, Patent Document 1 discloses a publication relating to this type of battery case.

JP 2009-302036 A

  However, in such a battery case, the case main body in which the battery is accommodated is formed of metal for the purpose of shielding (shielding) electromagnetic waves generated from the battery, so that a predetermined electromagnetic shielding property can be secured. However, since the weight of the battery case itself is heavy, it is difficult to reduce the weight of the vehicle, and it is difficult to improve the fuel efficiency of the vehicle required for environmental measures. Also, since the battery case is made of metal, the battery case itself can be secured to a certain degree of rigidity (strength). However, the battery case may be deformed or corroded by impact, so that it has sufficient impact resistance and resistance. It is difficult to obtain corrosiveness.

  Also, when a lithium battery is used as a battery, its performance deteriorates due to its characteristics when the outside air temperature becomes low or high (−30 ° C. to + 40 ° C.), so that a predetermined current does not flow easily at low and high temperatures. May cause trouble. As a countermeasure, it is necessary to perform heat insulation, heat insulation, and temperature adjustment of the battery, and the structure becomes complicated, resulting in high cost and various operations.

  The present invention has been made in view of such circumstances, and the object thereof is to reduce the weight while ensuring sufficient electromagnetic shielding properties, and is excellent in impact resistance, corrosion resistance, and the like. To provide a battery case.

  In order to achieve such an object, the invention according to claim 1 of the present invention is a battery case having a pair of case bodies that are openably and closably connected by hinges, and a battery is accommodated inside the case body. The pair of case bodies has a skin resin layer whose side walls are formed of a resin material on the outer surface side of the case body by multi-layer blow molding and a material in which a conductive material is kneaded in the resin. It has a conductive material layer formed on the inner side of the resin layer, and has at least a three-layer structure.

  In the invention according to claim 2, the side wall of the case body has an outer surface resin layer, a conductive material layer, and an inner surface resin layer formed inside the conductive material layer, and has at least a three-layer structure. Each of the outer wall and the inner wall is constituted by a double wall structure having an outer wall and an inner wall, and a hollow layer formed between the inner surface resin layers of the outer wall and the inner wall and having a heat insulating effect and capable of adjusting the temperature in the case body. It is characterized by that. The invention according to claim 3 is characterized in that the side wall of the case body includes a pair of skin resin layers formed on the outer surface and the inner surface side of the side wall, and a conductive material layer formed on the inner side of each skin resin layer. And at least a three-layer structure.

  Furthermore, the invention described in claim 4 is characterized in that a binder layer made of an adhesive is provided on both surfaces of the conductive material layer, and the invention described in claim 5 is characterized in that the thickness of the conductive material layer is Is formed to be equal to or thinner than the skin resin layer.

  According to the first aspect of the present invention, the side walls of the pair of case bodies in which the batteries are accommodated are formed on the outer surface side of the case body by multilayer blow molding and the skins. Since it has a resin conductive material layer formed inside the resin layer and is composed of at least a three-layer structure, the case body is made of resin while ensuring a sufficient electromagnetic shielding property with the conductive material layer. By doing so, the weight can be reduced, and the impact resistance, corrosion resistance and the like can be improved.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the side wall of the case body has at least three layers including a skin resin layer, a conductive material layer, and an inner surface resin layer. A battery case using a hollow layer having an inner wall and an outer wall each configured in a structure, and having a hollow layer that has a heat insulating effect and can adjust the temperature inside the case body between the inner wall resin layer of the outer wall and the inner wall The temperature of the battery can be adjusted, and the battery accommodated in the case can be improved in performance at a low temperature or a high temperature, or its life can be extended.

  Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1, the pair of skin resin layers in which the side walls of the case body are formed on the outer surface and the inner surface side, and the respective skin resins The conductive material layer formed on the inner side of the layer has a structure of at least three layers, so that the structure of the side wall itself can be simplified and the molding can be easily performed. be able to.

  According to the invention described in claim 4, in addition to the effects of the invention described in claims 1 to 3, a binder layer made of an adhesive is provided on both surfaces of the outer wall and the inner wall of the conductive material layer. By using a binder layer of a predetermined adhesive according to the type of the conductive material, the conductive material layer can be securely adhered to the skin resin layer or the like, and a stable electromagnetic shielding property can be ensured over a long period of time.

  Further, according to the invention described in claim 5, in addition to the effects of the invention described in claims 1 to 4, since the thickness of the conductive material layer is equal to or thinner than that of the skin resin layer, It can be set to an optimum amount that can ensure a predetermined electromagnetic wave shielding property while suppressing the amount of material used, and the cost of the battery case can be further reduced.

The perspective view which shows one Embodiment of the battery case concerning this invention The longitudinal section 2 is an enlarged sectional view of part A in FIG. 2 is an enlarged cross-sectional view of part B of FIG. Sectional view similar to FIG. 4 showing a modification of the case body Sectional view similar to FIG. 4 showing another modification of the case body 2 is a longitudinal sectional view similar to FIG. 2, showing another embodiment of the battery case according to the present invention. FIG. 7 is an enlarged cross-sectional view of part C of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 4 show an embodiment of a battery case according to the present invention. As shown in FIGS. 1 and 2, the battery case 1 has side walls 1a to 1d, a ceiling wall 1e, and a bottom wall 1f (hereinafter, these walls are referred to as side walls 1a to 1f). It has a pair of case bodies 2 and 3 which are formed in a hollow rectangular parallelepiped shape having a width W and a height H and which are divided into upper and lower portions having substantially the same height. The case main bodies 2 and 3 are connected so that one side wall 1a on the long side is connected by a hinge 4 and the other side wall 1b on the long side is connected by a sliding hook 5 so that it can be locked (opened and closed). ing.

  The case bodies 2 and 3 have housing recesses 2a and 3a in which a battery 20 (to be described later) is housed, and for example, one side wall 1c on the short side of the lower case body 3 is connected to a battery. A plurality of cable extraction holes 6 from which cables (not shown) are extracted are formed. Further, recessed portions 7 and 8 that are recessed inward are provided in the middle position of the side wall 1b to which the hooks 5 of the case bodies 2 and 3 are attached in a state of being adjacent (continuous) in the vertical direction.

  A locking protrusion 10 is provided over the entire length in the upper end of the recess 8 of the lower case body 3, and one of the longitudinal directions is provided at the lower end of the recess 7 of the upper case body 2. A locking protrusion 9 having a predetermined length is provided on the side. A pair of upper and lower locking recesses 5 a and 5 b provided on the back surface side of the hook 5 are locked to the locking protrusions 9 and 10.

  The hook 5 is slidably locked to the locking protrusion 10 of the lower case body 3 at the lower locking recess 5b, and at the position shown in FIG. The locked state of the case body 2 with the locking ridge 9 is released, and the upper and lower case bodies 2 and 3 can be opened and closed around the hinge 4. Further, by sliding the hook 5 from the position shown in FIG. 1 as indicated by an arrow A, the upper locking recess 5a of the hook 5 is locked to the case protrusion 9 of the upper case body 2, and a pair of case main bodies is obtained. Opening a few is prohibited. The hinge 4 and the hook 5 are the same even if they are formed by separate parts other than the integral hinge and the integral hook.

  The side walls 1a to 1f of the battery case 1 configured in this way are configured as shown in FIGS. That is, the case main bodies 2 and 3 have a double wall structure in which the side walls 1a to 1f are each formed of the outer wall 11 and the inner wall 12 and the hollow layer 13 provided between the outer wall 11 and the inner wall 12 by multilayer blow molding. It is configured. At this time, as shown in FIG. 4, the outer wall 11 and the inner wall 12 are made of a skin resin layer 14 formed on the outer surface side of each of the side walls 1 a to 1 f and a conductive material layer formed inside each skin resin layer 14. 15 and a three-layer structure of an inner surface resin layer 16 formed inside each conductive material layer 15.

  As the skin resin layer 14 and the inner surface resin layer 16, for example, resin materials such as polypropylene (PP), high density polyethylene (HDPE), and nylon (PA) are used, and the inner surface resin layer 16 is made of these resins. Return material is used. The return material is an end material and a recycled material generated on the outer peripheral side of the molded product when the battery case 1 is molded. The conductive material layer 15 is made of a material obtained by kneading a conductive material such as carbon black, CFRP, graphite, or metal filler in a predetermined resin material at a predetermined ratio.

  In addition, as these various materials used at the time of blow molding of the battery case 1, when the skin resin layer 14 and the inner surface resin layer 16 are polypropylene, olefin is used as the conductive material of the conductive material layer 15, and the skin resin When the layer 14 or the inner surface resin layer 16 is nylon, it is preferable to use a nylon material as the conductive material, and this is the same in each modification described later.

  And the thickness t1 of the skin resin layer 14 shown in FIG. 4, the thickness t2 of the conductive material layer 15, and the thickness t3 of the inner surface resin layer 16 are, for example, a layer ratio configuration, and the skin resin layer 14 is 20 to 40%. The conductive material layer 15 is set to about 5 to 50%, and the inner surface resin layer 16 is set to about 20 to 55%, so that the conductive material layer 15 is thinned.

  The hinge 4 that connects the case bodies 2 and 3 so as to be openable and closable is formed by an integral flange that is integrally formed when the upper and lower case bodies 2 and 3 are formed by multilayer blow molding. Further, as shown in FIG. 3, a concave portion 17 and a convex portion 18 that can be engaged with each other are integrally formed at the end portions of the side walls 1b of the case main bodies 2 and 3 so as to be fitted and connectable. In addition, the outer peripheral ends of the outer walls 11 and the inner walls 12 of the case main bodies 2 and 3 are connected by connecting walls 19 (see FIG. 3) made of the same walls as the outer walls 11 and the inner walls 12, respectively. The layer 13 is formed in a sealed space. In addition, the said recessed part 17 and the convex part 18 are not necessarily required, and can also be abbreviate | omitted.

  When the battery case 1 is manufactured, a resin material that can form the skin resin layer 14 and a return material that can form the inner surface resin layer 16 (or a resin material similar to the skin resin layer 14 at the beginning of molding); Three types of resin materials in which a predetermined conductive material is kneaded in advance are prepared. Then, the case main bodies 2 and 3 and the hinge 4, the recesses 7 and 8, and the locking protrusions 9 and 10 are simultaneously molded by blow molding using a multi-layer blow molding machine using these materials. The battery case 1 is manufactured by engaging and engaging the recessed recesses 5a and 5b of the separately formed hook 5 with the molded case bodies 2 and 3 respectively.

By the way, the reason why the multilayer blow molding is used for molding the battery case 1 is as follows. In other words, in order to obtain an impact resistance superior to that of a metal with a resin molded product, a solution can be achieved by forming a monocoque structure by providing a hollow layer and increasing physical strength. In order to mold the case with resin, it is necessary to form the outer wall and the inner wall separately and combine them in injection molding. In that regard, if multilayer blow molding is used, the outer wall, the inner wall, the hinge, etc. can be integrally molded at the same time. Therefore, the type of resin of the skin resin layer 14, the conductive material layer 15 and the inner surface resin layer 16, the type of conductive material, By setting the kneading ratio to the resin, the temperature condition and viscosity of the parison, and the like, the electromagnetic shielding property by the conductive material layer 15 is, for example, about 30 dB to 60 dB, and the volume resistivity is 10 ⁻² to 10 ⁴ Ω · cm. This is because the battery case 1 having a moderate performance can be obtained.

  The battery case 1 thus manufactured accommodates, for example, a battery 20 for an electric vehicle comprising three battery modules and a battery pack as shown in FIG. 2 in the accommodating recess 3a of the lower case body 3. The terminals of the three batteries 20 are connected to each other with a cable (not shown). Then, the end of the cable connecting the three batteries 20 is pulled out from the cable lead-out hole 6 of the case main body 3 and connected to the battery 20 of another battery case 1 installed adjacent thereto or the cable thereof. By applying this to a predetermined number of battery cases 1 and mounting each battery case 1 on the body of an electric vehicle, the battery 20 in each battery case 1 can be used as a battery for the electric vehicle.

  At this time, in the case of an electric vehicle, the current flowing to the electric control system by DC-AC conversion or brush control becomes a current with a large amount of ripple due to the system relationship, and this also flows to the battery 20. However, this electromagnetic wave is shielded by the conductive material layer 15 on the outer wall 11 and the inner wall 12 of the battery case 1, and radiation (leakage) to the outside of the battery case 1 is prevented. Further, the electromagnetic waves radiated from the cables connecting the batteries 20 are prevented from being radiated out of the cables by the shield structure provided on the cables themselves.

  That is, the conductive material is kneaded between the outer wall 11 of the side walls 1a to 1f and the skin resin layer 14 and the inner surface resin layer 16 of the inner wall 12 while reducing the weight by making the side walls 1a to fd of the battery case 1 resin. By providing the respective conductive material layers 15, it is possible to shield the electromagnetic waves radiated from the battery 20 and to ensure a predetermined electromagnetic wave shielding property for the battery case 1.

  Thus, according to the battery case 1, the outer wall 11 and the inner wall 12 of the side walls 1a to 1f of the pair of upper and lower case bodies 2 and 3 having the housing recesses 2a and 3a in which the battery 20 is housed are multilayered. By blow molding, a skin resin layer 14 formed on the outer surface side, a resin conductive material layer 15 formed inside the skin resin layer 14, and an inner surface resin layer 16 formed inside the conductive material layer 15. Each of which has a three-layer structure so that the conductive material layers 15 on the outer wall 11 and the inner wall 12 can shield electromagnetic waves radiated from the battery 20 and reliably prevent radiation and leakage to the outside. The battery case 1 can be sufficiently shielded from electromagnetic waves, and for example, adverse effects of the electromagnetic waves on the vehicle control system and the human body can be suppressed.

  In addition, since the pair of case bodies 2 and 3 of the battery case 1 are made of resin, the weight of the battery case 1 can be reduced by reducing the weight compared to a conventional metal case. In addition, the deformation of the battery case 1 can be prevented by the elastic force of the resin and its impact resistance can be improved, and the corrosion of the case bodies 2 and 3 can be prevented by the use of the resin. Thus, it is possible to obtain a battery case 1 with high reliability and long life.

  In addition, since the pair of case bodies 2 and 3 has a double wall structure of the outer wall 11 and the inner wall 12 and the hollow layer 13 formed in a sealed state between the outer wall 11 and the inner wall 12 and having a heat insulating effect, The hollow layer 13 can further improve the impact resistance of the case bodies 2 and 3, and can reliably prevent leakage of electromagnetic waves due to deformation of the battery case 1 when a vehicle accident occurs, for example. Further, since the thickness t2 of the conductive material layer 15 is formed to be equal to or thinner than the skin resin layer 14 and the inner surface resin layer 16, the amount of the conductive material is suppressed to an optimum amount (minimum amount). Thus, the cost of the battery case 1 can be reduced.

  Furthermore, since the outer wall 11 and the inner wall 12 have a three-layer sandwich structure, the conductive material layer 15 can be positioned at a predetermined position in the thickness direction of the side walls 1a to 1f, while ensuring a stable electromagnetic wave shielding property. The impact resistance of the case bodies 2 and 3 can be further improved. Moreover, since the inner surface resin layer 16 inside the conductive material layer 15 that is not exposed to the outside is formed of a return material, the return material as an end material generated at the time of blow molding of the case main bodies 2 and 3 is effectively used, The yield of the battery case 1 can be improved, and a cheaper battery case 1 can be obtained.

  In addition, by mounting the battery case 1 on an electric vehicle, a hybrid electric vehicle, or the like, a large number of batteries 20 mounted on a vehicle such as an electric vehicle can be stably attached to the vehicle body, and a system unique to the electric vehicle. It is possible to contribute to environmental measures related to automobiles, such as reducing the weight of the vehicle and improving fuel efficiency while reliably shielding the above electromagnetic wave with the conductive material layer 15.

  Furthermore, since the battery case 1 has a pair of case main bodies 2 and 3 that are connected so as to be openable up and down, the battery 20 can be easily housed in the case main bodies 2 and 3 and By opening the case main body 2 by sliding the hook 5, the internal battery 20 can be easily replaced, and its maintainability can be improved. Further, since the hinge protrusions 9 and 10 for connecting the upper and lower case bodies 2 and 3 so as to be openable and closable can be integrally formed simultaneously by blow molding, the manufacturing cost of the case bodies 2 and 3 itself The battery case 1 can be obtained even more inexpensively.

  By the way, in the said embodiment, the outer wall 11 and the inner wall 12 of each side wall 1a-1f of the battery case 1 are the examples comprised by 3 type | mold 3 layer molding of the skin resin layer 14, the electrically-conductive material layer 15, and the inner surface resin layer 16. However, for example, it may be composed of three or more layers as shown in FIGS. Hereinafter, the same parts as those in the above embodiment will be described with the same reference numerals. First, the battery case 1 shown in FIG. 5 is a four-layer four-layer molding. The outer wall 11 and the inner wall 12 of the side walls 1a to 1f have a four-layer structure, and are recycled next to the skin resin layer 14 and the conductive material layer 15. A layer (recycled material layer) 22 is formed, and an inner surface resin layer 16 is formed inside the recycled layer 22.

  In the case of the side walls 1a to 1f, as the skin resin layer 14, the inner surface resin layer 16, and the conductive material layer 15, the same resin and conductive material as those in the above-described embodiment are used, and as the recycled layer 22, various recycled materials are used. Material is used. The thickness t1 to t4 of each layer is 10 to 20% for the skin resin layer 14, 10 to 50% for the conductive material layer 15, 10 to 15% for the recycle layer 22, and 10% to 15% for the inner surface resin layer 16. Is set to about 10 to 30%.

  Furthermore, the battery case 1 shown in FIG. 6 is a case of four types and six layers, and a recycling layer 22 is formed inside the skin resin layer 14 of the side walls 1a to 1f, and a binder layer 23 is formed inside the recycling layer 22. Then, the conductive material layer 15 is formed inside the binder layer 23, the binder layer 23 is formed inside the conductive material layer 15, and the inner surface resin layer 16 is formed inside the conductive layer 15. The inner wall 12 has a six-layer structure.

  As the skin resin layer 14, the recycling layer 22, the conductive material layer 15, and the inner surface resin layer 16 of this embodiment, the same resin and conductive material as in the above embodiment are used, and an appropriate adhesive is used as the binder layer 23. Is used. In addition, the resin is used for reinforcement, but may be reinforced with a different resin. The thickness t1 to t5 of each layer is 10 to 30% for the skin resin layer 14, 10 to 50% for the conductive material layer 15, about 0% for the recycle layer 22, and about 30% for the inner surface resin layer 16 18 to 80%, binder layer 23 is set to about 0 to 1%. In this example, the recycling layer 22 can be omitted completely.

  In each of these modifications, in addition to obtaining the same effects as the above-described embodiment, such as ensuring a predetermined electromagnetic wave shielding property by the conductive material layer 15, the outer wall 11 and the inner wall 12 have a multilayer structure having four or more layers. Therefore, the impact resistance, corrosion resistance, and the like of the outer wall 11 and the inner wall 12 can be further improved, and the effect of improving the reliability of the battery case 1 can be obtained. Thus, in the battery case 1 according to the embodiment of the present invention, the outer wall 11 and the inner wall 12 of the side walls 1a to 1f only need to be configured in a multilayer structure, and depending on the usage pattern of the battery case 1, etc. The structure can be adopted.

  7 and 8 show another embodiment of the battery case according to the present invention. Hereinafter, the same parts as those in the above embodiment will be described with the same reference numerals. As shown in FIG. 7, the battery case 1 of this embodiment has a single wall structure for the side walls 1 a to 1 f of the case bodies 2 and 3, and the outer wall 11 and the inner wall 12 of the above embodiment overlap and there is no hollow layer 13. Molded. 8A includes a pair of skin resin layers 14 formed on the outer surface side and the inner surface side, and a pair of conductive material layers 15 formed on the inner side of each skin resin layer 14. 4 layers (three layers when the conductive material layer 15 is regarded as one layer).

  Further, the side walls 1a to 1f shown in FIG. 8 (b) include a pair of skin resin layers 14 formed on the outer surface side and the inner surface side, and conductive material layers 15 formed on the inner sides of the skin resin layers 14, respectively. The inner surface resin layer 16 is formed on the inner side of the conductive material layer 15 in six layers (if the inner surface resin layer 16 is regarded as one layer, five layers). That is, in this example, the hollow layers 13 of the embodiment shown in FIG. 4 are eliminated, and the side walls 1a to 1f are formed in a state where the outer wall 11 and the inner wall 12 are crushed. The thickness (layer ratio configuration) of each layer shown in FIG. 8 is set in substantially the same manner as in the above embodiment.

  In the battery case 1 of this embodiment, although the hollow layer 13 is not provided, the conductive material layer 15 functioning as the heat insulating layer of the present invention acts in substantially the same manner as the hollow layer 13, thereby providing heat insulation and electromagnetic wave shielding. In addition to being able to secure the performance and obtaining substantially the same operational effects as the above-described embodiment in addition to weight reduction, it is possible to obtain the operational effect that the configuration of the case bodies 2 and 3 themselves can be simplified. Also in the battery case 1 of this embodiment, various multilayer structures of three or more layers similar to the outer wall 11 and the inner wall 12 of each modification example of the above-described embodiment can be adopted, for example, by providing a binder layer 23.

  In each of the above-described embodiments, an example in which three batteries 20 are accommodated in the battery case 1 in a stacked state in the vertical direction has been described. For example, a plurality of batteries 20 are accommodated in a side-by-side state. The number of the batteries 20 to be accommodated and the accommodation form thereof can be appropriately changed, and the shape of the battery case 1 itself can be appropriately changed according to the form of the battery 20 to be accommodated. Further, in each of the embodiments, the battery case 1 is formed of a pair of case bodies 2 and 3 having substantially the same shape and having the same height. However, different forms such as increasing the height of the lower case body 3 are used. The case main bodies 2 and 3 can be configured, and the open / close structure of the upper and lower case main bodies 2 and 3 is not limited to the hook 5 and an appropriate structure can be adopted.

  The present invention is not limited to application to a vehicle battery such as an electric vehicle or a hybrid electric vehicle, but can be applied to all devices in which a battery such as an electric device is used.

DESCRIPTION OF SYMBOLS 1 ...... Battery case 1a-1d ... Side wall 1e ... Ceiling wall 1f ... Bottom wall 2 ... Case body 2a ··························································································································· Hook 5a, 5b ··· Locking recess 6 ······ Cable lead-out hole 9, 10 ··· Locking protrusion 11 ········ Outer wall 12 ··· .... Inner wall 13 ... Hollow layer 14 ... Skin resin layer 15 ... Conductive material layer 16 ... Internal resin layer 17 ... ······················································· 19 ..Binder layer

Claims (5)

A battery case having a pair of case bodies connected to each other by a hinge so as to be openable and closable, in which a battery is accommodated.
The pair of case bodies has a skin resin layer whose side walls are formed of a resin material on the outer surface side of the case body by multilayer blow molding, and a material obtained by kneading a conductive material in the resin. A battery case comprising a conductive material layer formed on the inside and having a three-layer structure.   The side wall of the case main body has an outer surface resin layer, a conductive material layer, and an inner surface resin layer formed on the inner side of the conductive material layer. 2. The battery according to claim 1, wherein the battery is formed of a double wall structure having a hollow layer formed between the inner resin layers of the outer wall and the inner wall and having a heat insulating effect and capable of adjusting the temperature in the case body. Case.   The side wall of the case body has a pair of skin resin layers formed on the outer surface and the inner surface side of the side walls, and a conductive material layer formed on the inner side of each skin resin layer, and is configured in at least a three-layer structure. The battery case according to claim 1, wherein:   The battery case according to claim 1, wherein a binder layer made of an adhesive is provided on both surfaces of the conductive material layer.   5. The battery case according to claim 1, wherein the conductive material layer has a thickness equal to or thinner than that of the skin resin layer.

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