Battery Module

Abstract

To provide a battery module capable of improving the efficiency of cooling and heating batteries.SOLUTION: A battery module comprises: a plurality of secondary batteries; cooling and heating means for cooling or heating the secondary batteries; and a heat transfer member arranged between the secondary batteries and the cooling and heating means. A high-viscosity fluid in contact with the secondary batteries and an intermediate member in contact with the high-viscosity fluid and holding the same are arranged between the secondary batteries and the heat transfer member.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a battery module. [Background technology]

[0002] In order to reduce CO2 emissions in light of climate-related disasters, the electrification of industrial machinery is being promoted, and research is also being conducted on secondary batteries as an energy source for vehicles and other applications. In a secondary battery group (battery module) made up of such secondary batteries, the performance or life of the battery can be affected by temperature, so a structure for regulating the battery temperature is sometimes provided. Patent Document 1 describes a battery module equipped with a thermally conductive material in contact with the battery and a cooling plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-225765 Summary of the Invention [Problem to be solved by the invention]

[0004] When cooling or heating a battery, it is desirable to efficiently transfer heat from or to the battery. However, depending on the state of contact between the battery and the thermally conductive material, the efficiency of cooling or heating can decrease, and there is room for improvement in the cooling or heating structure.

[0005] An object of the present invention is to provide a battery module that can improve the efficiency of cooling and heating a battery, which in turn contributes to improving energy efficiency. [Means for solving the problem]

[0006] According to the present invention, A battery module, A plurality of secondary batteries; a cooling / heating means for cooling or heating the secondary battery; a heat transfer member disposed between the secondary battery and the cooling / heating means, A highly viscous fluid in contact with the secondary battery and an intermediate member in contact with the highly viscous fluid and holding the highly viscous fluid are disposed between the secondary battery and the heat transfer member. 、 the secondary battery includes a laminated body in which a positive electrode layer, an electrolyte layer, and a negative electrode layer are stacked, and an exterior body that encases the laminated body; the exterior body has a housing portion that houses the laminate, the highly viscous fluid is in contact with the container; the exterior body is formed by folding a material forming the exterior body at a folding portion, and the storage portion includes the folding portion as a part thereof, the exterior body includes a peripheral portion around the housing portion, the peripheral portion having a sealing portion where the material is joined, The portion of the container including the bent portion has a flat portion, and the flat portion is in contact with the highly viscous fluid. , a battery module is provided. [Effects of the Invention]

[0007] According to the present invention, the efficiency of cooling and heating the battery can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view schematically showing a battery module BM according to one embodiment. [Figure 2] FIG. 1 is a front view of a secondary battery according to an embodiment. [Figure 3] 2 is a cross-sectional view taken along line AA of the secondary battery according to the embodiment; FIG. [Figure 4] FIG. 2 is a plan view showing the configuration of a material forming an exterior body according to one embodiment. [Figure 5] View from the C arrow in Figure 4. [Figure 6] 1 is a schematic diagram of a cooling / heating structure provided in a secondary battery according to an embodiment; [Figure 7] BB line cross-sectional view of a cooling and heating structure provided in a secondary battery according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention as claimed, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be arbitrarily combined. Furthermore, the same reference numerals are used for the same or similar components, and redundant explanations will be omitted.

[0010] The battery module according to this embodiment includes a plurality of secondary batteries, a cooling / heating device for cooling or heating the secondary batteries, and a heat transfer member disposed between the secondary batteries and the cooling / heating device. Furthermore, a highly viscous fluid in contact with the secondary batteries and an intermediate member in contact with the highly viscous fluid and holding the highly viscous fluid are disposed between the secondary batteries and the heat transfer member. This improves the efficiency of cooling and heating the battery.

[0011] (Battery module BM) 1 is a cross-sectional view schematically illustrating a battery module BM according to one embodiment. The battery module 100 can be mounted on an electric vehicle such as a hybrid vehicle or an EV (not shown). The battery module 100 includes a plurality of secondary batteries 200, a plurality of separators 300, and a cooling / heating structure 400.

[0012] A plurality of secondary batteries 200 (batteries) are stacked in their thickness direction (Z direction) to form a battery group. The secondary batteries 200 are arranged in an upright position and stacked alternately with insulating separators 300 in the Z direction. Approximately flat end plates 500 are arranged on both ends of the stack of secondary batteries 200 and separators 300 in the stacking direction. The end plates 500 are formed with holes through which fastening bolts 510 for fixing the battery module 100 to an installation site 600 can pass. The installation site 600 is made of, for example, sheet metal for an electric vehicle and is formed with a pair of female threads 610 into which the pair of fastening bolts 510 are screwed.

[0013] (Secondary battery) Fig. 2 is a front view of a secondary battery according to one embodiment, and Fig. 3 is a cross-sectional view of the secondary battery according to one embodiment taken along line AA. In the figure, arrow X indicates the longitudinal direction of the secondary battery 200 (or the direction in which the lead terminals extend), arrow Y indicates the width direction of the secondary battery 200 (or the direction perpendicular to the direction in which the lead terminals extend), and arrow Z indicates the thickness direction of the secondary battery 200 (the stacking direction of the laminate 210), with the X, Y, and Z directions being perpendicular to one another. Fig. 2 is a view of the secondary battery 200 as viewed in the Z direction, and also as viewed from the stacking direction of the laminate of the secondary battery 200 and separator 300 shown in Fig. 1.

[0014] The secondary battery 200 includes a laminate 210, which is an element of the secondary battery, lead terminals 221 and 222, current collecting terminals 223 and 224, and an exterior body 230 that encases the laminate 210, and has the form of a battery cell suitable for an assembled battery.

[0015] The laminate 210 has a rectangular parallelepiped shape as a whole, and as shown in Fig. 3, has a two-layer structure of positive electrode layers 211 and 212 and two negative electrode layers 213 and 214. However, the positive electrode layer and the negative electrode layer in the laminate 210 may be one layer or three or more layers. Solid electrolyte layers 219 are provided between the positive electrode layer 211 and the negative electrode layer 213, and between the positive electrode layer 212 and the negative electrode layer 214, respectively.

[0016] The positive electrode layers 211 and 212 each include a positive electrode active material layer 215, and have a positive electrode current collector 216 common to the two positive electrode layers 211 and 212. The positive electrode current collector 216 is arranged in a layered form in the center of the stack 210 in the Z direction, and the positive electrode active material layers 215 are stacked on the front and back sides of the positive electrode current collector 216.

[0017] The negative electrode layers 213 and 214 are disposed on one side of the positive electrode layers 211 and 212 in the Z direction, and are stacked such that the positive electrode layers 211 and 212 are sandwiched between the negative electrode layers 213 and 214. However, a configuration opposite to the configuration of this embodiment, in which two positive electrode layers sandwich two negative electrode layers, may also be employed. The negative electrode layers 213 and 214 each include a negative electrode active material layer 217 and a negative electrode current collector 218. The two negative electrode current collectors 218 are each formed in a layered form on the outermost layers of the laminate 210.

[0018] Examples of active materials constituting the positive electrode active material layer 215 include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, and lithium metal phosphate. Examples of active materials constituting the negative electrode active material layer 217 include lithium-based materials and silicon-based materials. Examples of lithium-based materials include Li metal and Li alloys. Examples of silicon-based materials include Si and SiO. Other examples of active materials constituting the negative electrode active material layer 217 include carbon materials such as graphite, soft carbon, and hard carbon, tin-based materials (Sn, SnO, etc.), and lithium titanate.

[0019] The electrolyte layer 219 includes, for example, a solid, gel, or liquid electrolyte having ion conductivity. Examples of such materials include sulfide-based solid electrolyte materials, oxide-based solid electrolyte materials, nitride-based solid electrolyte materials, halide-based solid electrolyte materials, and gel materials containing lithium-containing salts or lithium-ion conductive ionic liquids. The positive electrode current collector 216 and the negative electrode current collector 218 are made of, for example, a metal foil, sheet, or plate made of aluminum, copper, stainless steel, or the like. The positive electrode active material layer 215, the negative electrode active material layer 217, and the electrolyte layer 219 may be formed by binding particles of the materials that make them up with an organic polymer compound binder. In one embodiment, the secondary battery 200 may be an all-solid-state battery.

[0020] Lead terminals 221 and 222 are connected to a charger or an electrical load to charge or discharge laminate 210. One end of lead terminals 221 and 222 is located outside exterior body 230, and the other end is located inside exterior body 230. Here, the inside of exterior body 230 refers to the space formed by a sealing portion of exterior body 230, which will be described later.

[0021] The other end of lead terminal 221 is connected to positive electrode current collector 216 via current collecting terminal 223 inside exterior body 230, and lead terminal 221 forms a terminal for the positive electrode. Lead terminal 221 and current collecting terminal 223 are formed, for example, from a conductive metal sheet or metal plate. Meanwhile, the other end of lead terminal 222 is connected to negative electrode current collector 218 via current collecting terminal 224 inside exterior body 230, and lead terminal 222 forms a terminal for the negative electrode. Lead terminal 222 and current collecting terminal 224 are formed, for example, from a conductive metal sheet or metal plate.

[0022] The arrangement of the lead terminals 221 and 222 is not particularly limited, and the lead terminals 221 and 222 may be arranged at both ends in the longitudinal direction (X direction) of the secondary battery 200, or at one end (upper portion) in the width direction (Y direction) of the secondary battery 200. In one embodiment, the lead terminals 221 and 222 are arranged at both ends in the longitudinal direction (X direction) of the secondary battery 200, and in this arrangement, during charging, a current flows in the longitudinal direction of the secondary battery 200, which generates heat. However, because the cooling and heating structure 400 is arranged along the longitudinal direction of the secondary battery 200, the cooling efficiency of the secondary battery 200 is improved.

[0023] FIG. 4 is a plan view showing the configuration of a material forming an exterior body according to one embodiment, and FIG. 5 is a view taken along the arrow C in FIG. 4. The exterior body 230 wraps the laminate 210. In this embodiment, the exterior body 230 is formed by folding the material forming the exterior body 230, for example, a laminate film 232, in half. The laminate film 232 is formed, for example, by covering the front and back surfaces of a metal layer with a resin layer (insulating layer). The exterior body 230 formed from this laminate film 232 has flexibility that can follow the expansion and contraction of the laminate 210. The flexibility that can follow the expansion and contraction of the laminate 210 can be obtained by the way the laminate 210 is wrapped, the shape and structure of the exterior body 230, etc.

[0024] In this embodiment, the exterior body 230 includes a housing portion 231 that is located in the center when viewed in the Z direction and that houses the laminate 210, and a peripheral portion 233 that surrounds the housing portion 231. When viewed in the Z direction, the peripheral portion 233 has four sides 233a to 233d.

[0025] The accommodation section 231 is formed by overlapping recesses 236 and 237 formed in portions 234 and 235 on both sides of the folded portion a when the laminate film 232 is in an open state with the recesses 236 and 237 overlapping when the laminate film 232 is folded. The accommodation section 231 includes main surfaces 231e and 231f that extend in a plane (XY plane) that intersects with the stacking direction (Z direction) of the laminate 210 and face each other, and side surfaces 231a to 231d that are arranged to connect the main surfaces 231e and 231f.

[0026] Peripheral edge portion 233 is formed by overlapping portions of laminate film 232 that do not have recesses 236 and 237 when laminate film 232 is open. In this embodiment, side 233a of the four outer sides of peripheral edge portion 233 is included in folded portion a that is formed when laminate film 232 is folded, and one portion of storage portion 231 (side surface 231a) includes a portion of folded portion a that extends along side side 233a.

[0027] 4 and 5, the folded portion a is drawn wider to make it easier to understand, but the side surface 231a of the storage portion 231 including the folded portion a has a flat portion as shown in FIGS. 1 and 2. In other words, among the side surfaces of the storage portion 231, from the side surfaces 231b to 231d, the peripheral portion 233 extends in the direction of the approximate normal to the surface, whereas from the side surface 231a, the edge 233a of the peripheral portion 233 does not substantially extend.

[0028] 2, the other three sides 233b to 233d of peripheral portion 233 include sealing portions 233e to 233g. Sealing portions 233e to 233g are formed by joining the material (laminate film 232) of exterior body 230 by adhesive bonding, welding, or the like. Lead terminals 221 and 222 are provided on opposing sides 233b and 233d of three sides 233b to 233d so as to traverse sealing portions 233e and 233g, respectively.

[0029] (Cooling and heating structure) 1, when the secondary battery 200 is used in the battery module 100, the secondary battery 200 is arranged so that a predetermined surface of the secondary battery 200 faces the heat transfer member 420. At this time, in order to efficiently transfer heat from or to the secondary battery 200, it is preferable that the secondary battery 200 (exterior body 230) and the heat transfer member 420 are connected by a member. Therefore, in this embodiment, a cooling / heating structure 400 for the secondary battery 200, which will be described below, is adopted.

[0030] As shown in FIG. 1 , in one embodiment, the cooling and heating structure 400 includes a cooling and heating means 410, a plurality of heat transfer members 420, a plurality of intermediate members 430, and a plurality of highly viscous fluids 440. In another embodiment, the cooling and heating structure 400 may be configured with the cooling and heating means 410, one heat transfer member 420, one intermediate member 430, and one highly viscous fluid 440 in contact with the plurality of secondary batteries 200. FIG. 6 is a schematic diagram of a cooling and heating structure provided in a secondary battery according to one embodiment. FIG. 6 is a view of the secondary battery 200 and the cooling and heating structure 400 viewed in the Z direction, and also viewed from the stacking direction of the stack of the secondary battery 200 and the separator 300 shown in FIG. 1 . FIG. 7 is a cross-sectional view of the cooling and heating structure provided in a secondary battery according to one embodiment, taken along line BB, showing the lower part of the secondary battery 200 and the cooling and heating structure 400.

[0031] As described above, exterior body 230 is formed by folding laminate film 232 in half and joining it by adhesive, welding, or the like so as to include three sides 233b to 233d of peripheral portion 233. This joining forms sealing portions 233e to 233g, and since laminate film 232 is adhered or pressed in conjunction with this, sealing portions 233e and 233g and, depending on the joining, adjacent portions 233h and 233i (hereinafter referred to as "protruding portion 233h" and "protruding portion 233i") protrude from folded portion a of accommodating portion 231 (or side surface 231a of accommodating portion 231) toward cooling / heating means 410.

[0032] Sealing portions 233e and 233g are rigid because they are bonded, and protruding portions 233h and 233i are rigid because they are folded. In one embodiment, as shown in Fig. 6, the length of cooling and heating structure 400 in the longitudinal direction (x direction) is set to be less than the length between sealing portions 233e and 233g and, depending on the bonding, between protruding portions 233h and 233i. This allows cooling and heating structure 400 to fit between sealing portions 233e and 233g and, depending on the bonding, between protruding portions 233h and 233i, improving adhesion between exterior body 230 and highly viscous fluid 440. Furthermore, since the cooling and heating structure 400 is fitted between the sealing portions 233e and 233g, and depending on the joining, between the protrusions 233h and 233i, the distance between the laminate 210 and the cooling and heating structure 400 is shortened, reducing thermal resistance, and further allowing the cooling and heating structure 400, for example, the heat transfer member 420, to be made thinner, contributing to improved heat transfer and reduced costs. Furthermore, as a result, the laminate 210 can be made larger in the Y direction (or the volume can be increased) in a battery module BM of the same size, which can also contribute to improving the energy density of the battery module BM.

[0033] On the other hand, if the length in the longitudinal direction of cooling and heating structure 400 is longer than the distance between sealing portions 233e and 233g or the distance between protrusions 233h and 233i, a portion of exterior body 230 of secondary battery 200 that cannot be contacted by high-viscosity fluid 440 is formed, that is, a gap is formed between exterior body 230 and high-viscosity fluid 440, and air with low thermal conductivity may remain in the gap. Alternatively, the distance between exterior body 230 and cooling and heating structure 400 becomes long (for example, several millimeters or more), and even if the gap can be filled with high-viscosity fluid without any gaps, the thermal resistance may become large.

[0034] (Cooling and heating means) The cooling and heating means 410 cools or heats the secondary battery 200. In this embodiment, the cooling and heating means 410 is a heat sink in which a refrigerant or a heat medium passes through fluid passages 412 formed in a plate-like member 411. However, the cooling and heating means 410 may be, for example, an air-cooled cooling structure that introduces wind generated when the vehicle is running, or other known techniques may be used as appropriate.

[0035] (heat transfer material) The heat transfer member 420 transfers heat from or to the secondary battery 200 to or from the cooling / heating means 410. The heat transfer member 420 is disposed between the secondary battery 200 and the cooling / heating means 410. A thermally conductive gel such as silicone gel may be used as the heat transfer member 420. Other examples of the heat transfer member 420 include adhesive materials that harden after application, clay-like silicone putty sheets for heat dissipation that adhere well to irregularities, and silicone grease for heat dissipation. The heat transfer member 420 can fix the intermediate member 430 disposed between the sealing portions 233e and 233g or between the protruding portions 233h and 233i. Furthermore, the heat transfer member 420 can reduce or prevent gaps between the cooling / heating means 410 and the intermediate member 430.

[0036] (Intermediate parts) The intermediate member 430 transfers heat from the secondary battery 200 or heat to the secondary battery 200 to or from the cooling / heating means 410 via the heat transfer member 420. The intermediate member 430 is disposed between the secondary battery 200 and the heat transfer member 420 and is in contact with the heat transfer member 420. The intermediate member 430 is not particularly limited as long as it is a thermally conductive member that can hold the highly viscous fluid 440 described below, and metal films, composite films containing metal, and the like are used. Examples of the intermediate member 430 include laminate films, metal foils such as aluminum, and metal sheets, which are used in the exterior body 230. Alternatively, even if the intermediate member 430 is made of a material with low thermal conductivity, a thin film (resin) of, for example, 0.5 mm or less, can be used as the intermediate member 430 because of its low thermal resistance.

[0037] Furthermore, when a thermally conductive gel is used as the heat transfer member 420, the intermediate member 430 prevents the heat transfer member 420 from mixing with the highly viscous fluid 440, improving the durability of the cooling and heating structure 400. Furthermore, when a rigid intermediate member 430 is used, it becomes easier to place the secondary battery 200 thereon.

[0038] (high viscosity fluid) The high-viscosity fluid 440 transfers heat from the secondary battery 200 or heat to the secondary battery 200 to or from the cooling / heating means 410 via the intermediate member 430 and the heat transfer member 420. The high-viscosity fluid 440 is disposed between the secondary battery 200 and the intermediate member 430 and is in contact with the secondary battery 200 and the intermediate member 430. The high-viscosity fluid 440 may be a thermally conductive grease, such as a mineral oil or silicone grease containing a thermally conductive filler. To minimize pump-out, a high-viscosity fluid having an ASTM (JIS) consistency of 1 to 6 may be used. Alternatively, even if the high-viscosity fluid 440 is made of a material with low thermal conductivity, it can be used as the high-viscosity fluid 440 as long as it is a thin film, e.g., 0.5 mm or less, due to its low thermal resistance. On the other hand, if a thermally conductive grease is used as the high viscosity fluid 440, the thickness thereof may be, for example, greater than 0.5 mm.

[0039] When the secondary battery 200 is charged or discharged, the side surface 231a (including the bent portion a) of the housing portion 231 may expand or contract, but at that time, the secondary battery 200 can slide on the high-viscosity fluid 440, and the adhesion between the secondary battery 200 and the intermediate member 430 is maintained. Furthermore, when the secondary battery 200 expands or contracts greatly, the adhesion between the exterior body 230 and the high-viscosity fluid 440 is improved by using high-viscosity grease as the high-viscosity fluid 440.

[0040] On the other hand, if the high-viscosity fluid 440 is not provided and the heat transfer member 420 is used to follow this expansion and contraction, it is necessary to ensure a thickness of the heat transfer member 420 in the width direction of the secondary battery 200 so that the heat transfer member 420 can expand and contract to follow the expansion and contraction of the side surface 231a of the accommodation portion 231. However, in this embodiment, the secondary battery 200 can slide on the high-viscosity fluid 440, so there is no need to ensure a thickness of the heat transfer member 420, and the amount of heat transfer member 420 used can be reduced. In addition, the thin thickness reduces thermal resistance. As a result, the stack 210 can be made larger in the Y direction (or the volume can be increased) in a battery module BM of the same size, which can also contribute to improving the energy density of the battery module BM.

[0041] As described above, the side surface 231a of the accommodation portion 231, including the bent portion a, has a flat portion. By bringing the high-viscosity fluid 440 into contact with this flat side surface 231a, the cooling and heating efficiency of the secondary battery 200 is improved. Even if the side surface 231a of the accommodation portion 231 has some irregularities, the high-viscosity fluid 440 can deform according to the shape, and therefore fills the gap between the secondary battery 200 and the intermediate member 430, thereby suppressing a decrease in the cooling and heating efficiency of the secondary battery 200.

[0042] 5, recess 236 is a recess with a depth d1 relative to portion 234, and recess 237 is a recess with a depth d2 relative to portion 235. Note that although depth d1 is equal to depth d2 here, the depths of recesses 236 and 237 may be different. Furthermore, recess 236 and recess 237 are spaced apart by the width of bent portion a.

[0043] As a result, the width of the side surface 231a of the accommodating portion 231 is the sum of the depths d1 and d2 of the recesses 236 and 237 and the width of the bent portion a. As shown in Fig. 7, the length of the heat transfer member 420, the intermediate member 430, and the high-viscosity fluid 440 in the thickness direction (Z direction) of the secondary battery 200 is equal to or greater than the length of the side surface 231a of the accommodating portion 231. This improves the cooling and heating efficiency of the secondary battery 200.

[0044] <Summary of the embodiment> The above embodiment discloses at least the following battery module.

[0045] 1. The battery module (100) of the above embodiment is A plurality of secondary batteries (200); a cooling / heating means (410) for cooling or heating the secondary battery (200); a heat transfer member (420) disposed between the secondary battery (200) and the cooling / heating means (410); A highly viscous fluid (440) in contact with the secondary battery (200) and an intermediate member (430) in contact with the highly viscous fluid (440) and holding the highly viscous fluid (440) are disposed between the secondary battery (200) and the heat transfer member (420). According to this embodiment, when the secondary battery expands and contracts, the secondary battery can slide on the high-viscosity fluid, thereby maintaining the adhesion of the high-viscosity fluid to the secondary battery, and heat from or to the secondary battery can be efficiently transferred to or from the cooling / heating means.

[0046] 2. In the above embodiment, The secondary battery (200) comprises a laminate (210) in which positive electrode layers (211, 212), an electrolyte layer (219), and negative electrode layers (213, 214) are laminated, and an exterior body (230) that encases the laminate (210); The exterior body (230) has a housing portion (231) that houses the laminate (210), The highly viscous fluid (440) is in contact with the container (231). According to this embodiment, the storage section enclosing the secondary battery stack is in contact with the high-viscosity fluid, so that heat from the secondary battery or heat to the secondary battery can be efficiently transferred to or from the cooling / heating means.

[0047] 3. In the above embodiment, the exterior body (230) is formed by bending a material forming the exterior body (230) at a bending portion (a), and the storage portion (231) includes the bending portion (a) as a part thereof; The exterior body (230) includes a peripheral portion (233) around the housing portion (231), and the peripheral portion (233) has sealing portions (233e, 233f, 233g) where the material is joined. According to this embodiment, the receiving portion for receiving the stack can be easily formed.

[0048] 4. In the above embodiment, The portion of the storage portion (231) including the bent portion (a) has a flat portion, and the flat portion is in contact with the highly viscous fluid (440). According to this embodiment, the flat portion comes into contact with the secondary battery, thereby improving the efficiency of cooling and heating the secondary battery.

[0049] 5. In the above embodiment, The bent portion (a) of the storage portion (231) is located between the sealed portions (233e, 233g), and the sealed portions (233e, 233g) protrude from the bent portion (a) of the storage portion (231) toward the cooling / heating means (410), and the highly viscous fluid (440) and the intermediate member (430) are arranged between the sealed portions (233e, 233g). According to this embodiment, the gap between the exterior body and the high-viscosity fluid is reduced or eliminated, preventing the fluid from remaining as air with low thermal conductivity, thereby improving the cooling and heating efficiency of the secondary battery. Furthermore, since the stack can be made larger in the Y direction (or the volume can be increased) for a battery module BM of the same size, the energy density of the battery module BM can be improved.

[0050] 6. In the above embodiment, The secondary battery (200) has terminals (221, 222) connected to the stack (210), and the terminals (221, 222) are arranged at both ends of the secondary battery (200) in the longitudinal direction. According to this embodiment, the heat generated by the current flowing in the longitudinal direction of the secondary battery during charging can be efficiently cooled by the cooling and heating structure.

[0051] 7. The battery module (100) of the above embodiment is The secondary batteries (200) are stacked alternately with insulating separators (300). According to this embodiment, heat from the secondary battery or heat to the secondary battery can be efficiently transferred to or from the cooling / heating means.

[0052] Although the embodiments of the invention have been described above, the invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the gist of the invention. [Explanation of symbols]

[0053] 100 battery module, 200 secondary battery, 210 laminate, 211, 212 positive electrode layer, 213, 214 negative electrode layer, 215 positive electrode active material layer, 216 positive electrode current collector, 217 negative electrode active material layer, 218 negative electrode current collector, 219 electrolyte layer, 221, 222 lead terminal, 223, 224 current collector terminal, 230 exterior body, 231 housing portion, 231a to 231d side surfaces of housing portion, 231e, 231f main surface of housing portion, 232 laminate film, 233 peripheral portion, 233a to 233d edges of peripheral portion, 233e and 233g sealing portion, 233h, 233i protrusions, 234, 235 both side portions of laminate film, 236, 237 recesses, 300 Separator, 400 cooling / heating structure, 410 cooling / heating means, 411 plate-shaped member, 412 fluid passage, 420 heat transfer member, 430 intermediate member, 440 high viscosity fluid, 500 end plate, 510 fastening bolt, 600 installation portion, 610 female thread portion, a bent portion

Claims

1. A battery module, A plurality of secondary batteries; a cooling / heating means for cooling or heating the secondary battery; a heat transfer member disposed between the secondary battery and the cooling / heating means, a highly viscous fluid in contact with the secondary battery and an intermediate member in contact with the highly viscous fluid and holding the highly viscous fluid are disposed between the secondary battery and the heat transfer member; the secondary battery includes a laminated body in which a positive electrode layer, an electrolyte layer, and a negative electrode layer are stacked, and an exterior body that encases the laminated body; the exterior body has a housing portion that houses the laminate, the highly viscous fluid is in contact with the container; the exterior body is formed by folding a material forming the exterior body at a folding portion, and the storage portion includes the folding portion as a part thereof, the exterior body includes a peripheral portion around the housing portion, the peripheral portion having a sealing portion where the material is joined, A battery module, wherein a portion of the accommodation portion including the bent portion has a flat portion, and the flat portion is in contact with the high-viscosity fluid.

2. A battery module, A plurality of secondary batteries; a cooling / heating means for cooling or heating the secondary battery; a heat transfer member disposed between the secondary battery and the cooling / heating means, a highly viscous fluid in contact with the secondary battery and an intermediate member in contact with the highly viscous fluid and holding the highly viscous fluid are disposed between the secondary battery and the heat transfer member; the secondary battery includes a laminated body in which a positive electrode layer, an electrolyte layer, and a negative electrode layer are stacked, and an exterior body that encases the laminated body; the exterior body has a housing portion that houses the laminate, the highly viscous fluid is in contact with the container; the exterior body is formed by folding a material forming the exterior body at a folding portion, and the storage portion includes the folding portion as a part thereof, the exterior body includes a peripheral portion around the housing portion, the peripheral portion having a sealing portion where the material is joined, A battery module, wherein the folded portion of the storage section is located between the sealed portions, the sealed portion protrudes from the folded portion of the storage section toward the cooling / heating means, and the high viscosity fluid and the intermediate member are arranged between the sealed portions.

3. 3. The battery module according to claim 2, wherein a portion of the housing portion including the bent portion has a flat portion, and the flat portion is in contact with the highly viscous fluid.

4. 4. The battery module according to claim 1, wherein the secondary battery includes terminals connected to the laminate, the terminals being arranged at both ends of the secondary battery in a longitudinal direction.

5. The battery module according to claim 1 , wherein the secondary batteries and insulating separators are alternately stacked.

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