Abstract: The present invention relates to a sheet-type electrode for a secondary battery, a method for manufacturing the same, a secondary battery comprising the same, and a cable-type secondary battery, the electrode comprising: a sheet-type electrode stacked body comprising a collector, an electrode active material formed on a surface of the collector, and a porous first support layer formed on the electrode active material; and a sealing layer formed so as to surround the entire side surface of the electrode stacked body.

Abstract: A button cell includes a housing consisting of two metal housing halves, an electrode separator assembly in the form of a preferably spiral-shaped winding inside the housing, and metal conductors which electrically connect the electrodes of the assembly to the housing halves, wherein at least one of the conductors is connected to the respective housing half by welding.

Abstract: A lithium-ion secondary-battery case that allows bonding without weld spatter and has high strength against external force acting on the battery case, and a method for manufacturing the lithium-ion secondary-battery case are provided. Specifically, an austenitic stainless steel foil is used for a cup component (2), and a two-phase stainless steel having an austenite transformation start temperature AC1 in a temperature increase process at 650° C. to 950° C. and an austenite and ferrite two-phase temperature range of 880° C. and higher, is used for a cover component (3), and the diffusion bonding is proceeded while accompanied by grain boundary movement upon transformation of the two-phase steel from a ferrite phase into an austenite phase within a heating temperature range of 880° C. to 1080° C.

Abstract: In various embodiments, methods and systems, of an ionic varistor system is provided. The ionic varistor system includes an electrolyte-membrane assembly having a liquid electrolyte that is enclosed in a solid electrolyte membrane. The ionic varistor system further includes conductive contacts operably coupled to the electrolyte-membrane assembly. The electrolytic-membrane assembly is operably coupled to an electrical potential surface. As the ionic concentration in the electrical potential surface is increased or decreased, some ions diffuse through the solid electrolyte membrane, causing the ions to mix with the liquid electrolyte to achieve an electrostatic equilibrium state that is thermally and mechanically stable. The liquid electrolyte and the diffused ions create an encapsulated ion channel in the electrolyte-membrane assembly.

Abstract: Rechargeable battery modules and rechargeable battery module handling methods are described. According to one aspect, a rechargeable battery module includes a housing, a plurality of terminals, a plurality of rechargeable cells within the housing and coupled with the terminals, and wherein the rechargeable cells are configured to store electrical energy, a plurality of lift members at different locations of the housing, and wherein the lift members provide a plurality of lift points for the rechargeable battery module which enable the rechargeable battery module to be lifted in a plurality of different orientations.

Abstract: A method of fabricating a multilayered thin film solid state battery device. The method steps include, but are not limited to, the forming of the following layers: substrate member, a barrier material, a first electrode material, a thickness of cathode material, an electrolyte, an anode material, and a second electrode material. The formation of the barrier material can include forming a polymer material being configured to substantially block a migration of an active metal species to the substrate member, and being characterized by a barrier degrading temperature. The formation of cathode material can include forming a cathode material having an amorphous characteristic, while maintaining a temperature of about ?40 Degrees Celsius to no greater than 500 Degrees Celsius such that a spatial volume is characterized by an external border region of the cathode material. The method can then involve transferring the resulting thin film solid state battery device.

Abstract: Electrodes, production methods and mono-cell batteries are provided, which comprise active material particles embedded in electrically conductive metallic porous structure, dry-etched anode structures and battery structures with thick anodes and cathodes that have spatially uniform resistance. The metallic porous structure provides electric conductivity, a large volume that supports good ionic conductivity, that in turn reduces directional elongation of the particles during operation, and may enable reduction or removal of binders, conductive additives and/or current collectors to yield electrodes with higher structural stability, lower resistance, possibly higher energy density and longer cycling lifetime. Dry etching treatments may be used to reduce oxidized surfaces of the active material particles, thereby simplifying production methods and enhancing porosity and ionic conductivity of the electrodes.

Abstract: A sealed battery of the present invention includes a power generation element including an electrode sheet and a separator; a laminate film disposed in such a way as to enclose the power generation element therein; an electrode connection terminal connected to the electrode sheet; and an electrolyte. The laminate film is shaped to form a housing section for power generation element, the housing section being hermetically sealed at a fusion bonding section where parts of the laminate film are overlapped and fusion-bonded and at a first sealing section where the electrode connection terminal is sandwiched between and fusion-bonded with parts of the laminate film. The power generation element and the electrolyte are housed in the housing section for power generation element. The electrode connection terminal comprises an external connection section for connecting with external and a conductive section disposed between the external connection section and the first sealing section.

Abstract: An energy storage apparatus includes an energy storage device containing a case where a corner portion is formed by a first wall portion and a second wall portion, an opposedly facing member which opposedly faces the first wall portion, and an insulator covering at least a region of the opposedly facing member which opposedly faces the energy storage device. The opposedly facing member contains a body disposed along the first wall portion and an extension portion extending from the body along the second wall portion. The insulator contains a cover portion which extends to a distal end of the extension portion from a boundary position between the extension portion and the body along an opposedly facing surface of the extension portion which opposedly faces the second wall portion, is folded back at the distal end, and extends along an outer surface of the extension portion opposite to the second wall portion.

Abstract: Provided herein are battery packs comprising a first polymeric endplate, a second polymeric endplate, and a plurality (n) of partitions extending between the first endplate and second endplate and defining (n?1) battery cavities. Each cavity is capable of receiving a battery cell stack comprising a plurality of battery cells and optionally cooling plates and foam pads. Partitions comprise a plurality of polymeric repeating spacers, and each spacer from each partition can correspond to a cooling plate common to a plurality of battery cell stacks. Each of the repeating spacers and cooling plates can include a plurality of aligned apertures, and corresponding bolts can occupy the aligned apertures and secure the same to the endplates. Each repeating spacer can correspond to a complete or partial battery unit, wherein a complete battery unit comprises a first battery cell, a cooling plate, a second battery cell, and a foam pad.

Abstract: A stacked battery includes a first current collecting case, a second current collecting case, and a third current collecting case, a first electrode body and a second electrode body. Each of The first current collecting case and the second current collecting case includes a positive electrode wall portion. Each of the second current collecting case and the third current collecting case includes a second negative electrode wall portion.

Abstract: An electrochemical device includes a plurality of electrode assemblies arranged spaced apart from each other in a same direction and a casing member which packages the electrode assemblies, in which the casing member includes a plurality of accommodation portions which accommodates the electrode assemblies, respectively, and a connecting portion which connects between two adjacent accommodation portions, a thickness of the connecting portion is less than a thickness of the accommodation portions, and the connecting portion is bent defining a curved bending portion.

Abstract: The invention provides a secondary battery which comprises a cap plate and at least one cell. The secondary battery further comprises connecting pieces, each connecting piece is parallel to the cap plate and positioned at an inside of the cap plate in a thickness direction of the cap plate, a longitudinal direction of each connecting piece is parallel to a length direction of the cap plate, a transverse direction of each connecting piece is parallel to a width direction of the cap plate. Each connecting piece has: a tab welding portion for being welded to the corresponding tab of each cell; and an electrode terminal welding portion connected to the tab welding portion along the longitudinal direction of each connecting piece for being welded to the corresponding electrode terminal of the cap plate so as to electrically connect the corresponding electrode terminal and the corresponding tab of each cell.

Abstract: Embodiments described herein relate generally to electrochemical cells having semi-solid electrodes that include a gel polymer additive such that the electrodes demonstrate longer cycle life while significantly retaining the electronic performance of the electrodes and the electrochemical cells formed therefrom. In some embodiments, a semi-solid electrode can include about 20% to about 75% by volume of an active material, about 0.5% to about 25% by volume of a conductive material, and about 20% to about 70% by volume of an electrolyte. The electrolyte further includes about 0.01% to about 1.5% by weight of a polymer additive. In some embodiments, the electrolyte can include about 0.1% to about 0.7% of the polymer additive.

Abstract: A vehicle traction battery assembly including an array of stacked prismatic can cases and a support structure is provided. Each of the can cases may define a cavity to receive a battery cell and a multi-prong comb-shaped base. The support structure supports the cases. The support structure and the base define channels therebetween configured for coolant to pass therethrough. A lower portion of each of the can cases open to the channels may be of a dielectric material. A dielectric layer may span a length of the can cases and may be located above the channels. Each of the can cases may define a first locating feature sized to integrate with a second locating feature of an adjacent can case to align the can cases.

Abstract: Disclosed are solid-state batteries having improved energy density and methods of manufacturing the solid-state batteries having improved energy density. In some embodiments, the solid-state battery may include a substrate of yttria-stabilized zirconia, a cathode current collector formed on the substrate, an anode current collector formed on the substrate, a cathode of lithium cobalt oxide in electrical contact with the cathode current collector, an anode of lithium in electrical contact with the anode current collector, and a solid-state electrolyte of lithium phosphorous oxynitride formed between the cathode and the anode.

Abstract: In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery that is durable even when force is externally applied thereto is provided. A region that is easily partly bent and a region that is not easily partly bent owing to a protective material provided in the region are intentionally formed to obtain the durable secondary battery.

Abstract: Pull tab assemblies and related components and methods are disclosed herein. Some pull tab assemblies are configured to selectively interrupt and reestablish connections between a battery and a battery contact of an electronic circuit. Some pull tab assemblies include perforated pull tabs and/or pull tabs in which a proximal portion of the pull tab is configured to be cut or removed. Some pull tabs are designed to remain within a slot of the housing to impede fluid entry into the housing. Some methods disclosed herein involve programming memory that is disposed within a housing of a pull tab assembly or device.

Abstract: An inert material is included in the electrode assembling of a battery having a thickness which compensates for a difference in dimension of the electrode assembly when thinner electrodes are used to construct a battery having reduced capacity, to thereby be accommodated in a battery case of uniform dimension regardless of the electrical characteristics of the battery.

Abstract: Disclosed herein is a battery module having a plurality of plate-shaped battery cells, each of which has electrode terminals respectively formed at the upper end and the lower end thereof, the battery module including two or more battery cells, a buffering member disposed at the interface between the battery cells to restrain movement of the battery cells and to buffer volume change of the battery cells during charge and discharge of the battery cells, and a pair of module housings coupled to entirely cover the outside of a stack of the battery cells excluding the electrode terminals of the battery cells, each of the module housings being formed of a sheet.

Abstract: Disclosed is a battery case including a case part including a first accommodation part having an irreversible opening to irreversibly release a closed state and a second accommodation part separated from the first accommodation part, and a cover part installed at the case part.

Abstract: A battery module includes a housing including a first interior surface, a second interior surface opposite the first interior surface, and a compressed cell assembly disposed within an interior space of the housing between the first and second interior surfaces. The compressed cell assembly includes a plurality of prismatic battery cells arranged in a cell stack that includes a first end, a second end opposite the first end, and a retaining wall disposed between the first end of the cell stack and the first interior surface of the housing. The retaining wall includes a first surface in contact with the first end of the cell stack and a second surface opposite the first surface that contacts the first interior surface of the housing. The first and second interior surfaces are configured to maintain the compressed cell assembly in a compressed state having a compression force above a predetermined threshold.

Abstract: A flexible electrochemical device in which a plurality of electrode assemblies is electrically connected to each other so that the flexible electrochemical device may be repeatedly bent, includes at least two electrode assemblies that are arranged separate from each other and a casing member that packs the at least two electrode assemblies and includes at least two accommodation portions in which electrode assemblies are individually received, and a connecting portion that connects the at least two adjacent accommodation portions where a path between a conductive line that electrically connects at least two electrode assemblies together and an electrolyte is defined in the connecting portion.

Abstract: Disclosed herein is an electrode assembly including two or more unit cells, each of which includes a cathode, an anode, and a separator disposed between the cathode and the anode, electrode tabs protruding from the respective electrodes, wherein the unit cells are stacked in a height direction on the basis of a plane, at least two of the unit cells having different planer sizes, and one or more corners of each of the unit cells, which do not tangent to one side of each of the unit cells at which the electrode tabs are formed, are round.

Abstract: An electricity storage device includes an electrode assembly having primary electrodes and secondary electrodes, a case having a wall with an inlet, and an insulator. The electrode assembly has a facing surface facing the wall of the case. The primary electrodes have primary tabs protruding from one edge. The second electrodes have secondary tabs. The group of primary tabs and the group of secondary tabs each have a first side and a second side on the opposite sides. In each of the group of primary tabs and the group of secondary tabs, the first side faces the facing surface, and the second side is bent to face the wall of the case. The inlet is located at a position sandwiched regions of the wall onto which the primary tab group and the secondary tab group are projected when the wall is viewed from a direction perpendicular to the facing surface.

Abstract: The present invention provides a heat suppressing alkaline storage battery including a positive electrode lead having a downsized portion that incorporates a PTC thermistor. A battery includes a positive electrode lead having a first lead half body, a second lead half body, and a PTC thermistor, the first and second lead half bodies overlap end portions formed in a portion where the first and second lead half bodies overlap with each other, the overlap end portions being larger than the PTC thermistor as viewed from a plane and being in contact with the PTC thermistor, the PTC thermistor is fitted in a fitting recessed portion formed in the overlap end portion of the first lead half body, and an exposed portion of the PTC thermistor is covered with a protective material.

Abstract: There is provided an electrode assembly having steps including: a first electrode stair including at least one first electrode unit; and a second electrode stair including at least one second electrode unit having an area different from that of the first electrode unit, wherein the first electrode stair and the second electrode stair are stacked to be adjacent, separated by at least one separator as a boundary therebetween and including one or more electrode laminates having steps formed by a difference between areas of the first electrode stair and the second electrode stair, and shapes of the corners of the first electrode stair and the second electrode stair having steps are different. There is also provided a secondary battery including the electrode assembly. Secondary batteries having various designs without restriction in shapes of corners of electrode units can be provided.

Abstract: Provided are systems and methods for configuring battery packs in electric vehicles. A battery pack may include a plurality of battery modules, a support part, and at least one opening provided on the support part. The support part may be provided with a bottom for supporting the plurality of battery modules, sides, a top, and an accommodation space formed by the bottom, the sides, and the top for accommodating the plurality of battery modules. The opening provided on the bottom of the support part may enable the plurality of battery modules to be passed through the at least one opening and be detachably mounted to the bottom of the support part so as to be supported by the bottom.

Abstract: A traction battery assembly is provided which may include first and second arrays spaced apart and each having a plurality of battery cells. The battery cells may each have a positive and a negative terminal on a cell face facing the other array. The cells may be oriented in tilted stacks such that the terminals of at least one of the cells of the first array are aligned with oppositely charged terminals of two different cells of the second array. The assembly may also include a frame supporting and orienting the cells such that the cells of the arrays are tilted at opposing and inversely equal angles which are based on a width and length of each battery cell to facilitate the alignment of the terminals of at least one of the cells of the first array with the oppositely charged terminals of two different cells of the second array.

Abstract: To provide a method for producing a lead-acid battery negative plate for use in a storage battery which provides improved deteriorated rapid discharge characteristics by preventing an interfacial separation between a negative active material-filled plate and a carbon mixture-coated layer, which is a problem in a negative plate having such a configuration that the carbon mixture coated layer is formed on the surface of the negative active material-filled plate. A coating layer of a carbon mixture is formed at least in a part of a surface of a negative active material-filled plate. The carbon mixture is prepared by mixing two kinds of carbon materials consisting of a first carbon material having conductive properties and a second carbon material having capacitive capacitance and/or pseudo capacitive capacitance and a binding agent. Subsequently, a sufficient amount of lead ions are generated enough to be moved from the negative active material-filled plate into the carbon mixture-coated layer.

Abstract: A power storage device includes positive electrodes, negative electrodes separators each of which is located between a positive electrode and a negative electrode and insulates the positive electrode and the negative electrode from each other, and an electrode assembly, which is configured by stacking the positive electrodes, the negative electrodes, and the separators. The power storage device further includes an insulating member including sandwiching portions. Each sandwiching portion is formed by two insulating portions that sandwich a positive electrode non-application portion from both sides in the stacking direction of the electrode assembly. When viewed in the stacking direction of the electrode assembly, each insulating portion is arranged at least between a positive electrode border and a negative electrode border.

Abstract: A battery with three types of terminals is disclosed. The terminals include at least one negative terminal, at least one positive terminal, and at least one sensor terminal. The negative and positive terminals carry current during battery operation, while the sensor terminal is used to sense, communicate and/or control certain aspects of the battery. The sensor terminal can also be connected to external electronic units for sensing, communication and control of the battery usage.

Abstract: The described invention provides a packaged electrochemical device comprising an electrochemical battery, further comprising at least one electrochemical cell stack and a barrier packaging material. The present invention further provides a method of fabricating the packaged electrochemical device. The present invention further provides a flexible multifunctional liquid-based thermogalvanic cell that converts and stores electricity derived from low grade temperature differentials that exist in ubiquitous scenarios.

Abstract: A secondary battery module includes a plurality of plate shaped secondary cells; and a casing that is formed with a plurality of grooves extending in its depth direction, with at least one of the secondary cells being housed in a space defined between neighboring grooves, wherein: the plurality of grooves each extends from a lower portion of the casing towards an upper portion of the casing; and the plurality of secondary cells are electrically connected together in a space defined above the grooves and internal to the casing.

Abstract: A secondary battery comprising a battery package which encloses the outer perimeter of the secondary battery and covers the entire outer surface of positive and negative electrodes and a portion of each terminal of the positive and negative electrodes, wherein the battery package is formed of a laminate film comprising an outer polymer layer, an inner aluminum layer and an adhesive layer formed on a portion of the inner surface of the aluminum layer, the aluminum layer of the battery package being electrically connected with either of the positive and negative is provided. Alternatively, at least one electrically conductive metal foil on at least one of the outer upper and lower surfaces of the battery package is provided.

Abstract: An electrochemical device including a housing and a stack of electrochemical cells in the housing. Each electrochemical cell includes an anode electrode, a cathode electrode, a separator located between the anode electrode and the cathode electrode and an electrolyte. The electrochemical device also includes a current collector located between adjacent electrochemical cells, an anode bus operatively connected to the anodes of the electrochemical cells in the stack and a cathode bus operatively connected to the cathodes of the electrochemical cells in the stack. The housing, the anode electrode, the cathode electrode, the separator, the anode bus and the cathode bus are non-metallic.

Abstract: A power storage apparatus having a battery unit housed in a case includes external terminals of positive and negative poles for providing, from outside the case, electrical connection to corresponding positive and negative poles of the battery unit; and electronic parts, wherein only when a connection with the battery unit is cut from at least one of the external terminals of both the poles, the electronic parts can be accessed.

Abstract: A power storage module is formed by superimposing a pair of end plates at opposite ends in the stacking direction of a plurality of power storage cells that are stacked in the stacking direction. The pair of end plates are connected by a frame holding an insulator between itself and the power storage cells. Condensed water occurring on the surface of the power storage cells could contact the end plate. There is thus a possibility that a liquid junction will be formed; when the power storage module is in a mounted state the insulator includes a first rib extending in a direction, condensed water attached to the insulator cannot flow toward the end plate due to it being blocked by the first rib, thus preventing the power storage cell from forming a liquid junction with the end plate via the condensed water.

Abstract: Disclosed herein is a battery module including a battery cell array including two or more stacked battery cells, each of which is configured to have a structure in which an electrode assembly, including a cathode, an anode, and a separator disposed between the cathode and the anode, is received in a battery case together with an electrolyte in a sealed state, and fixing members, each of which is integrally coupled to a portion or the entirety of an outer edge of a corresponding one of the battery cells, each of the fixing members being provided with an assembly type coupling structure, by which the fixing members are coupled to each other such that the battery cell array forms a stable stack structure.

Abstract: The stacked battery includes a negative electrode (46) and a positive electrode (41). The negative electrode has a negative electrode main portion (50) and a negative electrode lead (52). The positive electrode has a positive electrode main portion (45) and a positive electrode lead (51). The negative electrode main portion and the positive electrode main portion are stacked in a thickness direction with the negative electrode lead and the positive electrode lead extending in different directions as viewed from above. The positive electrode lead is fixed to a positive electrode case. In the positive electrode lead, a break place (X) is provided outside the negative electrode main portion as viewed from above when the negative electrode and the positive electrode are placed on top of each other. The break place (X) is broken when a shock is applied to the electrodes.

Abstract: A secondary battery includes at least two electrode assemblies, each electrode assembly including a first electrode plate, a separator, and a second electrode plate, a case accommodating the at least two electrode assemblies, electrode terminals electrically connected to the at least two electrode assemblies, a cap plate sealing the case and exposing the electrode terminals to the outside, and at least one insulation member between the at least two electrode assemblies, the insulation member defining a space between the at least two electrode assemblies.

Abstract: A power storage unit includes a battery module housed in a battery case. The battery module has, as components, a plurality of battery cells stacked and arranged in a direction (direction Y) crossing a transverse direction. Reinforcing members arranged at a predetermined spacing are provided between the battery cells. The power storage unit of this structure can prevent damage to the power storage unit disposed between seats adjacent to each other in the transverse direction, when frame members provided in the seats are moved in the transverse direction in the event of a crash of a moving conveyance.

Abstract: A battery pack having lead wires connected to a plurality of unit batteries which are distributed to prevent malfunction of the batteries due to contact between the unit batteries and the lead wires. The lead wires are distributed within the minimum distances to facilitate a wire distributing process and reduce manufacturing costs. The battery pack includes unit batteries, a spacer disposed between the unit batteries, a protective circuit module connected to the unit batteries through lead wires, and a holder surrounding the unit batteries and having paths through with the lead wires pass, respectively.

Abstract: A battery includes a stack of bipolar individual battery cells, each of which includes an electrode stack and two sheet metal covers bounding the individual battery cell at least in the stacking direction. The electrode stack is connected to at least one of the sheet metal covers by at least one weld. In the region of the at least one weld, the sheet metal cover welded to the electrode stack and/or the sheet metal cover of the adjacent individual battery cell in contact with the sheet metal cover is/are of a set-back design. As a result, the sheet metal covers of adjacent individual battery cells do not have any contact in the region of the at least one weld.

Abstract: A three-dimensional shaped battery includes a cell structure including a first electrode layer, a second electrode layer, and a separation layer disposed between the first electrode layer and the second electrode layer, where the cell structure may include a plurality of pattern units having different sizes from each other and a connecting portion which connects the pattern units to each other.

Abstract: A battery pack including a plurality of battery cells and having improved battery lifetime. The battery pack includes a holder case defining a plurality of cell spaces; and a plurality of battery cells are accommodated in a pattern in a portion of the plurality of cell spaces, wherein some of the plurality of cell spaces are empty.

Abstract: A battery housing is comprised of a unitary, seamless base member having a generally planar, quadrilateral bottom face with a side wall extending therefrom. The length dimension of the bottom face is at least twice the height of the side wall. The base member has an open top face. The housing includes a cover which closes the open top face and is engageable with the side wall of the base. An electrically resistive sealing gasket is configured to contact the cover member and the side wall so as to provide a fluid-tight seal. The components are mechanically interlocked by crimping or hemming. The housing is specifically configured to accommodate stacking of individual batteries into power assemblies, and the geometry of the housing optimizes thermal management. Further disclosed are batteries and battery assemblies including the housing.

Abstract: A thin film solid state battery configured with barrier regions formed on a flexible substrate member and method. The method includes forming a bottom thin film barrier material overlying and directly contacting a surface region of a substrate. A first current collector region can be formed overlying the bottom barrier material and forming a first cathode material overlying the first current collector region. A first electrolyte can be formed overlying the first cathode material, and a second current collector region can be formed overlying the first anode material. The method also includes forming an intermediary thin film barrier material overlying the second current collector region and forming a top thin film barrier material overlying the second electrochemical cell. The solid state battery can comprise the elements described in the method of fabrication.

Abstract: One example includes a plurality of substantially planar electrodes disposed in a stack, in alignment, the stack being at least partially disk-shaped with a first major face opposing a second major face, with an edge extending between the first major face and the second major face, a pocket, with a covered portion of the stack disposed in the pocket, the pocket shaped to conform to the stack with a first portion of the pocket covering a first segment of the first major face, a second portion covering a second segment of the second major face opposite the first segment, and an edge portion covering the edge of the stack, wherein a remaining portion of the stack extends out of the pocket and a film disposed over the remaining portion of the stack, substantially covering the remaining portion.

Abstract: Disclosed herein is a battery module including a battery cell stack configured to have a rectangular parallelepiped structure in which two or more plate-shaped battery cells, each of which has electrode terminals formed at one side thereof, are stacked and a breadth of one surface of the battery cell stack at which the electrode terminals of the battery cells are disposed is smaller than a width and a height of each major surface of the battery cell stack, a first module case bent to surround two relatively large major surfaces of the battery cell stack and one surface of the battery cell stack opposite to the surface of the battery cell stack at which the electrode terminals of the battery cells are disposed, among six surfaces of the battery cell stack and a surface, the first module case being made of a thermally conductive material that is capable of dissipating heat generated from the battery cells during charge and discharge of the battery cells, and a second module case bent to surround side surfaces o