Provided is a rectangular secondary battery with improved rigidity against vibrations and impacts. A rectangular secondary battery of the present invention includes: a flat-shaped electrode group; a current-collecting plate electrically connected to the electrode group; a battery case accommodating the current-collecting plate and the electrode group; a battery cover that closes an opening of the battery case; an electrode terminal penetrating through the battery cover, the electrode terminal being connected to the current-collecting plate via a connecting member; and a gasket that is inserted between the electrode terminal and the battery cover for insulating and sealing. An insulator is disposed between the current-collecting plate and the battery cover, the battery cover includes a battery cover side fixing part that fixes the insulator, and the insulator includes a current-collecting plate side fixing part that fixes the current-collecting plate.

Provided are a top cover for a battery, a battery and an energy storage device. The top cover for the battery includes a mounting sheet and an explosion-proof valve. The mounting sheet has an opening defined thereon. The explosion-proof valve includes a valve body, an explosion-proof diaphragm and a valve cover. The valve body is mounted in the opening, and the valve body has a ventilation groove defined on an upper surface thereof. The valve cover is mounted on the upper surface of the valve body and configured to partially cover the ventilation groove. The explosion-proof diaphragm is mounted on a lower surface of the valve body. A cavity is defined by the valve body, the explosion-proof diaphragm and the valve cover and is in communication with outside through the ventilation groove.

Provided are a top cover for a battery, a battery and an energy storage device. The top cover for the battery includes a mounting sheet and an explosion-proof valve. The mounting sheet has an opening defined thereon. The explosion-proof valve includes a valve body, an explosion-proof diaphragm and a valve cover. The valve body is mounted in the opening, and the valve body has a ventilation groove defined on an upper surface thereof. The valve cover is mounted on the upper surface of the valve body and configured to partially cover the ventilation groove. The explosion-proof diaphragm is mounted on a lower surface of the valve body. A cavity is defined by the valve body, the explosion-proof diaphragm and the valve cover and is in communication with outside through the ventilation groove.

A secondary battery includes: a case having an accommodating space therein; an electrode assembly accommodated in the case and having an uncoated portion on one end thereof; a current collector plate electrically connected to the uncoated portion of the electrode assembly; a cap plate sealing the case; and an electrode terminal outside the cap plate and electrically connected to the current collector plate. The current collector plate has a hole through which the electrode terminal passes and a coupling protrusion protruding toward the electrode assembly along a periphery of the hole.

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 secondary battery includes: an electrode assembly; a case made of steel, in which openings are provided at opposite sides and in which the electrode assembly is arranged; a side terminal electrically connected to an electrode tab of the electrode assembly; and a cap plate made of steel, through which the side terminal passes and which is coupled to an opening of the openings.

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 application provides a secondary battery, which includes a first electrode assembly, a second electrode assembly, a case, and a top cap assembly. The top cap assembly includes a top cap plate and a first electrode terminal, the top cap plate is connected to the case, and the first electrode terminal is arranged on the top cap plate. The first electrode assembly includes a first body and first tabs extending from the first body, and the first tabs are multiple and stacked. The second electrode assembly includes a second body and second tabs extending from the second body, and the second tabs are multiple and stacked. An end of each of the second tabs that is away from the second body is a second end portion. Each of the first tabs includes a first connecting portion extending beyond the second end portion.

In a state in which a sealing member is fixed to an exterior container by swaging, at least a tip side of a protrusion is embedded in a seal component. In a state before the sealing member is fixed to the exterior container by swaging, when the protrusion of the sealing member and the seal component are brought into abutment with each other, a communication path is formed in the protrusion or the seal component to communicate a space inside the exterior container and a space outside the exterior container with each other.

Disclosed are a battery, a battery module, a battery pack, and an electric vehicle. The battery includes a housing and at least two electrode core sets connected in series with each other and each including at least one electrode core (4). The electrode core (4) includes a positive plate, a negative plate, and an electrolyte located between the positive plate and the negative plate. The electrolyte is a solid electrolyte or a polymer electrolyte. Isolation layers (43) are arranged between opposite surfaces of two adjacent electrode core sets. Each isolation layer (43) is formed by curing an insulation adhesive coated on at least one of the opposite surfaces of the two adjacent electrode core sets.