A pouch-type secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; and a pouch film in which the electrode assembly is accommodated, wherein the pouch film includes a first side sealing portion from which a negative electrode lead connected to the electrode assembly protrudes, a second side sealing portion from which a positive electrode lead connected to the electrode assembly protrudes, and an upper sealing portion having both end portions connected to the first and second side sealing portions, and the pouch film includes a folded portion disposed on an end of the first side sealing portion and an end of the second side sealing portion, and folded toward a bottom portion of the pouch film, wherein the folded portion is folded in one direction.

Disclosed are a secondary battery and a secondary battery case.

According to one aspect of the present invention, provided is a case for a secondary battery including: a first recess part having a recessed shape; a second recess part opposite the first recess part and having a recessed shape; a circumferential part configured to surround a circumference of each of the first recess part and the second recess part when the case is unfolded; and a connection part provided between the first recess part and the second recess part to connect the first recess part to the second recess part, wherein, when the case is unfolded, the connection part includes: a first connection surface inclined in a first direction from one end of the first recess part; and a second connection surface inclined in the first direction from one end of the second recess part.

Embodiments described herein relate generally to systems and methods for improving safety features in electrochemical cells. In particular, the systems and methods as described herein can solve safety issues concerning gas generation in electrochemical cells.

An electricity storage device member is provided. The electricity storage device member includes a base material mainly composed of a metal and a resin layer stacked on the base material, in which the resin layer contains a crosslinked fluororesin.

A battery module includes a housing having an internal space; a cell stack accommodated in the internal space and including a plurality of battery cells and a plurality of heat blocking members stacked therein; a busbar assembly including a busbar frame opposing at least one side surface of the cell stack, and a plurality of busbars coupled to the busbar frame and electrically connected to the plurality of battery cells, wherein at least one of the plurality of heat blocking members includes an extension portion inserted into the busbar frame and preventing an electrical short circuit between the plurality of busbars.

A secondary battery includes a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly, the electrode tab being exposed to an outside through the pouch, a protection circuit module (PCM) connected to the electrode tab, a case holder disposed between the pouch and the PCM to support the PCM, a case top on the bare cell, the PCM and the case holder being covered by the case top, a case bottom at a bottom side of the bare cell, and a plate attached to a side surface of the bare cell, the plate being coupled to the case top and the case bottom.

A battery pack includes at least one battery cell; a protection circuit module electrically connected to the at least one battery cell; and a thermocompression bonding layer, the thermocompression bonding layer providing a disconnectable electrical connection between an electrode tab of the at least one battery cell and a connection tab of the protection circuit module, wherein the thermocompression bonding layer includes conductive particles and an insulating composite resin layer, the insulating composite resin layer surrounds the conductive particles, and the insulating composite resin layer includes at least one first resin layer and at least one second resin layer, the at least one first resin layer being different from the at least one second resin layer.

In one embodiment, a battery includes an exterior unit, an electrode group, an electrode terminal, tab bundles and a lead. The electrode group is housed in an interior cavity of the exterior unit, and the electrode terminal is exposed to an outside. Current collecting tabs are stacked in the thickness direction of the electrode group in each of the tab bundles having the same polarity. The tab bundles protrude from the electrode group to the same side in the length direction of the electrode group. The lead establishes an electric connection between the respective tab bundles and the electrode terminal. The tab bundles are bonded to the lead at positions deviated from one another in the thickness direction, and are mounted on the lead from the same side in the thickness direction.

The present disclosure provides a secondary battery, which comprises an electrode assembly, a pouch, an electrode lead and an insulating tape. The electrode assembly is received in the pouch, the electrode lead is connected with the electrode assembly and extends to the outside of the pouch in a length direction. The electrode assembly comprises electrode plates and a separator, the separator separates the electrode plates. An outer surface of the electrode assembly comprises a first surface and a second surface, an area of the second surface is smaller than an area of the first surface. The first surface is provided as two in number, and the two first surfaces face each other in a thickness direction; the second surface is provided as two in number, and the two second surfaces face each other in a width direction, each second surface connects two first surfaces. At least a part of the insulating tape is provided on the second surface; in the length direction, at least one end of the insulating tape exceeds the electrode plate.

The present invention features a pouch comprising a single layer of polymer material having a first surface and a second surface, wherein the second surface is disposed to define an interior space surrounded by the second surface of the pouch, and wherein the first surface is disposed to define the exterior of the pouch, wherein the single layer has a uniform thickness between the first surface and second surface, wherein the polymer material comprises a liquid crystal polymer, and wherein the pouch has a water vapor transmission rate of less than 0.1 g/m2/day between the interior space and the first surface of the pouch.