The present disclosure includes systems, devices, and methods for operating a battery. The battery includes a power unit having a first electrode coupled to a first current collector and a second electrode. The first current collector is coupled to a first conductive member. The battery further includes a separator having a first portion interposed between the first electrode and the second electrode and a second portion positioned between the second electrode and the first conductive member. In some aspects, the second portion of the separator is configured to break responsive to receipt of a force to the battery to discharge the power unit safely without thermal runaway and catastrophic damage.

In the stacking process to stack negative electrode plates and positive electrode plates alternately with a bellows-shaped separator therebetween, a control unit performs tension control to change control condition to determine operations of a conveyance adjustment unit so that tension of the separator is within a certain range.

An electrode feed unit includes an electrode plate feed unit, and the electrode plate feed unit includes an electrode cutting unit arranged to cut a conductive sheet into electrode plates by a certain length. The electrode cutting unit includes a fixed blade having a fixed cutting blade extending in a direction crossing a conveyance direction of the conductive sheet, a rotary blade of a disk shape having a rotary cutting blade on the radial outer edge, and a rotary blade moving unit arranged to rotate and move the rotary blade along the fixed blade in a state where the rotary cutting blade maintains contact with the fixed cutting blade.

A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

A secondary battery comprises an electrode assembly comprising radical units in which first and second electrodes are alternately laminated with a separator therebetween and a separation film surrounding the radical units to be repeatedly laminated, wherein the electrode assembly comprises a protection unit laminated on an outermost separation film disposed on the uppermost end or lowermost end of the separation film, the protection unit has a structure comprising a second protection electrode, a separator, and a first protection electrode which are successively laminated from the outermost separation film disposed on the uppermost end or lowermost end of the electrode assembly, the second protection electrode has a cross-sectional coating structure comprising a second collector and a second electrode active material portion coated with a second electrode active material on an inner surface of the second collector, and the inner surface is a surface facing a center of the electrode assembly.

An electrode structure, a bipolar all-solid secondary battery including the same, and a method of manufacturing the electrode structure are provided. The electrode structure includes: a current collector having a first surface and a second surface, wherein the first surface includes a first portion, a second portion, and an intermediate portion between the first portion and the second portion, the first portion and the second portion are arranged toward the outside in opposite directions to each other around the intermediate portion, and the second surface has an inward-folded structure; a cathode active material layer formed on the first portion of the first surface; an anode active material layer formed on the second portion of the first surface; and a compression pad arranged inside the inward-folded structure of the current collector.

The present invention provides an electrode assembly in which a plurality of unit cells are disposed, wherein one of the unit cells comprises: a first double-sided electrode in which a slurry is on opposite surfaces of a first collector; a separator adjacent to the first double-sided electrode; a second double-sided electrode adjacent to the separator and in which a slurry is on opposite surfaces of a second collector; and a single-sided electrode adjacent to the second double-sided electrode and in which the slurry is only on one surface of a third collector, the one surface facing the second double-sided electrode, the single-sided electrode having a coating layer on the slurry thereof, the coating layer preventing contact between the slurry of the single-sided electrode and the slurry on one of the surfaces of the second collector that faces the single-sided electrode, the coating layer allowing ions to pass therethrough.

The present invention provides an electrode assembly in which a plurality of unit cells are disposed, wherein one of the unit cells comprises: a first double-sided electrode in which a slurry is on opposite surfaces of a first collector; a separator adjacent to the first double-sided electrode; a second double-sided electrode adjacent to the separator and in which a slurry is on opposite surfaces of a second collector; and a single-sided electrode adjacent to the second double-sided electrode and in which the slurry is only on one surface of a third collector, the one surface facing the second double-sided electrode, the single-sided electrode having a coating layer on the slurry thereof, the coating layer preventing contact between the slurry of the single-sided electrode and the slurry on one of the surfaces of the second collector that faces the single-sided electrode, the coating layer allowing ions to pass therethrough.

A method for stacking a battery cell includes feeding a separator sheet through a guide assembly to fold the separator sheet, inserting a plurality of first electrodes into the separator sheet at a location where the separator sheet has been folded by the guide assembly, forming respective channels in the folded separator sheet including the plurality of first electrodes, inserting a plurality of second electrodes in the respective channels to form a multilayered body, and pressing the multilayered body to form the stacked battery cell where the plurality of first electrodes and the plurality of second electrodes are stacked in an alternating arrangement.

A method for stacking a battery cell includes feeding a separator sheet through a guide assembly to fold the separator sheet, inserting a plurality of first electrodes into the separator sheet at a location where the separator sheet has been folded by the guide assembly, forming respective channels in the folded separator sheet including the plurality of first electrodes, inserting a plurality of second electrodes in the respective channels to form a multilayered body, and pressing the multilayered body to form the stacked battery cell where the plurality of first electrodes and the plurality of second electrodes are stacked in an alternating arrangement.