A cylindrical secondary battery may have an insulation layer formed in a region in which the top cap and the first gasket are coupled to each other. The insulation layer may include a ceramic material and a binder. The secondary battery is designed so that, when an external electrical conductive object is electrically connected directly to a positive electrode and a negative electrode of the secondary battery, an electrode tab of the secondary battery is broken as quickly as possible.

This application relates to an energy storage device. In one embodiment, the energy storage device includes an electrode unit including first and second current collectors that are separated by a separator, first and second terminals respectively connected to the first and second current collectors and a case accommodating the electrode unit. The energy storage device also includes a flexible closure covering the case and having first and second through-holes passing therethrough and exposing the first and second terminals to the environment, wherein the flexible closure contains about 15 wt % or less of SiO.sub.2. According to some embodiments, since the weight percentage of SiO.sub.2 is significantly reduced and thus, the amount and degree of the SiO.sub.2 reduction significantly decreases, a structural deformation of the flexible closure at a microscopic level is minimized. Accordingly, a wetting phenomenon is significantly reduced, and thus the life span of an energy storage device significantly increases.

The present invention provides a large-capacity secondary battery, including: a rechargeable cell, a steel shell, a protection IC, an integrated IC, resistors, capacitors, an inductor, an LED lamp, a plastic part, a circular rigid FR-4 substrate, a metal cap, an insulation pad and an insulation heat shrink film, for integrating multiple functions of a constant voltage output, charge management and protection, and overcharge, overdischarge and overcurrent protection. Compared with the prior art, the large-capacity secondary battery of the present invention can achieve multi-functional integration of the battery, and also can save the space occupied by accessory structural parts of the battery and achieve a large capacity of the battery.

A composite including a polymer matrix; an inorganic moisture absorber; a ceramic filler, graphite, or a combination thereof; and a tracking resistance polymer, wherein the tracking resistance polymer includes an average bond energy between an atom forming a main chain and another atom covalently bonded to the atom that forms the main chain of about 350 kJ/mol to about 500 kJ/mol; a carbonaceous residue yield after pyrolysis of less than or equal to about 5 weight percent, based on the amount of the tracking resistance polymer before pyrolysis; or a combination thereof.

A battery case including a container having an opening and a sink configured to accommodate an electrode, and a cover having a contact portion configured to contact with the container. The battery case includes a polymer base material, the container includes a bottom wall and side walls, that are integrated to form the sink and the opening opposed to the bottom wall. A nanometer-size concavo-convex edge feature is positioned on at least one portion of the end face of the side walls configured to form the opening and on at least one portion of the contact surface of the contact portion of the cover configured to contact with at least one portion of the end face of the sidewalls of the container. A battery or a battery module including the battery case and an electrode assembly accommodated in the sink of the container of the battery case.

Disclosed are a battery case including a container configured to accommodate an electrode assembly, wherein the container includes a bottom wall and a plurality of side walls, the bottom wall and the plurality of side walls are integrated to have an open side opposed to the bottom wall and to provide a space for accommodating the electrode assembly, the container includes a composite including a base polymer and an inorganic moisture absorbent, expanded graphite, and red phosphorus, each of which are dispersed in the base polymer, and the battery case has a water vapor transmittance rate at about 38 C. under relative humidity of about 100% according to ISO 15106 or ASTM F1249 of less than about 0.07 g/m.sup.2/day and flame retardancy of V-0 measured according to UL (Underwriter's Laboratories)-94, and a battery or battery module including an electrode assembly accommodated in the container of the battery case.

The present disclosure provides a battery including an electrode body, a current collector terminal disposed on a side surface of the electrode body, and a laminate film covering the electrode body and the current collector terminal. The current collector terminal has a first surface opposed to the electrode body, a second surface opposed to the first surface, a third surface extending from an outer edge of the first surface toward the second surface side, and a first connecting surface connecting the third surface and the second surface. When the battery is viewed in the thickness direction, the boundary between the third surface and the first connecting surface is set to B.sub.1, and the boundary between the first connecting surface and the second surface is set to B.sub.2, the B.sub.2 is located inside the B.sub.1 in the thickness direction. The laminate film covers the third surface and the first connecting surface.

The present disclosure provides a battery including an electrode body, a current collector terminal disposed on a side surface of the electrode body, and a laminate film covering the electrode body and the current collector terminal. The current collector terminal has a first surface opposed to the electrode body, a second surface opposed to the first surface, a third surface extending from an outer edge of the first surface toward the second surface side, and a first connecting surface connecting the third surface and the second surface. When the battery is viewed in the thickness direction, the boundary between the third surface and the first connecting surface is set to B.sub.1, and the boundary between the first connecting surface and the second surface is set to B.sub.2, the B.sub.2 is located inside the B.sub.1 in the thickness direction. The laminate film covers the third surface and the first connecting surface.

A battery, including: an electrode body; a side face member; and a laminate film covering the electrode body and the side face member, in which: in a case in which the battery is viewed laterally from a side of the side face member, an outer edge of the side face member is positioned further toward an inner side than an outer edge of the electrode body, the laminate film is disposed so as to cover a face configuring the outer edge of the side face member and a face configuring the outer edge of the electrode body, a fused part X, at which respective inner faces of the laminate film are fused together, is disposed on the side face member, and a bent part at a starting point of the fused part X at a side of the side face member has a curved shape.

A battery, including: an electrode body; a side face member; and a laminate film covering the electrode body and the side face member, in which: in a case in which the battery is viewed laterally from a side of the side face member, an outer edge of the side face member is positioned further toward an inner side than an outer edge of the electrode body, the laminate film is disposed so as to cover a face configuring the outer edge of the side face member and a face configuring the outer edge of the electrode body, a fused part X, at which respective inner faces of the laminate film are fused together, is disposed on the side face member, and a bent part at a starting point of the fused part X at a side of the side face member has a curved shape.