An electric storage device includes an electrode assembly, an insulating cover covering the electrode assembly, and a case including a case body having a rectangular box shape and including an opening, the case body being configured to house the electrode assembly and the insulating cover. The insulating cover is formed into a rectangular box shape conforming to the case body. An embossing is applied to the insulating cover.

A film covered battery has a battery element equipped with a plurality of electrode plates laminated via separators, and an exterior film for hermetically sealing the battery element. A cover film is attached to a hollow present in predetermined regions set on a surface of the exterior film. The predetermined regions are regions obtained by removing overlap regions from projected regions obtained by projecting the electrode plates to the surface of the exterior film, the overlap regions being regions where the projected regions overlap with members interposed between the electrode plates at the outermost layers and the exterior film. It is possible to cover the hollow on the surface, without increasing the thickness of the film covered battery.

The invention concerns a battery pack (1), comprising a plurality of electrically connected battery cells (2), wherein the battery cells (2) are substantially flat with two opposite sides (2a, 2b) and a peripheral edge (2c), and wherein the battery cells (2) are arranged side by side as to form a layered structure, and an electronic arrangement configured to monitor and control the battery cells (2). The invention is characterized in that the electronic arrangement comprises a plurality of individual electronic circuit units (30), each of which being associated with a corresponding battery cell (2), wherein each of the electronic circuit units (30) is configured to be capable of monitoring and controlling its corresponding battery cell (2), and wherein each electronic circuit unit (30) is arranged on a thin and flexible circuit carrying sheet (3) that is arranged at one of the sides (2a, 2b) of the corresponding battery cell (2). The invention also concerns a method for manufacturing of a battery pack (1).

A rechargeable battery includes: an electrode assembly having a first electrode and a second electrode; an electrode terminal electrically connected to the electrode assembly; a case that receives the electrode assembly; a cap plate at an opening of the case, the cap plate closing and sealing the case and having a vent hole configured to discharge an internal pressure of the case; and a vent module including a vent portion, the vent portion including a buffer portion configured to buffer an impact that is transferred to the vent hole, and a fracture portion that closes and seals the vent hole, wherein the fracture portion is configured to be fractured by the internal pressure.

A cylindrical battery including an electrode body in which a negative electrode plate and a positive electrode plate to which a plurality of positive electrode leads is connected are wound with a separator interposed therebetween; an upper insulating plate disposed on the electrode body; a positive electrode current collector plate disposed on the upper insulating plate; a sealing body; and an outer can. A first positive electrode lead extends between the upper insulating plate and the current collector plate after passing through a through-hole of the upper insulating plate and is bent onto the current collector plate at an outer circumference portion thereof, and a second positive electrode lead extends along the outside of an outer circumference portion of the upper insulating plate and is bent onto the current collector plate at the outer circumference portion thereof. Those positive electrode leads are all connected to the current collector plate.

Provided is a thermoplastic elastomer composition which exhibits excellent flexibility in a wide temperature range from ordinary temperature to low temperature, which has a flame retardancy of V-0 according to the UL94 vertical burning test, without including any halogen-based flame retardant, which is excellent in thermal conductivity, electrical insulation and electrolytic solution resistance, and which can be suitably used in a soft battery pack protection member. The present invention provides a thermoplastic elastomer composition for a battery pack protection member, including 100 parts by mass of a resin composition including (a) 20 to 80% by mass of a hydrogenated product of a copolymer of an aromatic vinyl compound and a conjugated diene compound, and (b) 80 to 20% by mass of a softening material for non-aromatic rubber, in which the total of the component (a) and the component (b) is 100% by mass; (c) 0.1 to 10 parts by mass of a modified resin; and (d) 250 to 400 parts by mass of magnesium hydroxide.

The electrochemical device of the present disclosure includes a case, an electrode assembly disposed inside the case, and including a positive electrode and a negative electrode and a separator interposed between the positive electrode and the negative electrode, and an electrolyte injected inside the case, and a free space volume (EV) according to Equation 2 below with respect to a total volume of empty space inside the case (CV) according to Equation 1 below is 0 to 45 volume%. The contents of Equation 1 and Equation 2 are the same as disclosed in the present specification.

The electrochemical device is capable of solving the problem where gas generated by oxidation reaction of electrolyte due to high-voltage reduces reaction surface area of an electrode surface, and further increases side reaction, thereby accelerating degradation of capacity.

The present invention provides a secondary battery packaging material including at least a metal foil layer, a second base material layer, and a heat-sealing resin layer laminated in this order on a surface of a first base material layer. The second base material layer is laminated on the metal foil layer directly or via an anti-corrosion treatment layer. The first base material layer is formed of a resin composite containing a thermosetting resin or a thermoplastic resin. The second base material layer is formed of a resin composite containing a thermosetting resin.

An in-vehicle battery module includes a plurality of cylindrical battery cells, a battery cell holder, a protective case, a vent cover provided such that the battery cell holder is positioned between the protective case and the vent cover, the vent cover and the battery cell holder disposed such that a vent space in which gas discharged from an end face on a second-electrode side of the cylindrical battery cell flows is provided between the vent cover and the battery cell holder, at least one first-electrode bus bar, at least one second-electrode bus bar provided in the vent space, and a support member disposed partially in the vent space and the support member being configured to support the second-electrode bus bar from the vent cover side.

A metal-air battery cell includes an electrode assembly and a sealed pouch. The electrode assembly includes an air electrode, a negative electrode, a separator in contact with and disposed between the electrodes, and a hydrophobic gas diffusion layer in contact with a side of the air electrode opposite the separator. The pouch envelops the electrode assembly and contains an electrolyte therein. The pouch is defined by a gas permeable hydrophobic flexible layer in contact with the hydrophobic gas diffusion layer, and a gas and liquid impermeable flexible layer in contact with the negative electrode. The electrode assembly further includes a terminal extending from and away at least one of the electrodes, and through the pouch. The layers of the pouch are sealed to each other and around the terminal.