One variation of a battery unit includes: a series of anode collectors; a set of anode electrodes including anode material arranged on both side of the anode collectors; a set of anode interconnects interposed between and electrically coupling adjacent anode collectors and folded to locate the anode collectors in a boustrophedonic anode stack; a series of cathode collectors; a set of cathode electrodes including cathode material arranged on both side of the cathode collectors; a set of cathode interconnects interposed between and electrically coupling adjacent cathode collectors and folded to locate the cathode collectors in a boustrophedonic cathode stack with cathode collectors interdigitated between anode collectors in the boustrophedonic anode stack; and a set of separators arranged between the anode and cathode electrodes and transporting solvated ions between the anode and cathode electrodes.

A lithium metal polymer battery comprising a rigid casing and at least one electrochemical cell; the battery assembled without an active mechanical pressure system.

A method for manufacturing an electrode assembly includes forming each of a negative electrode, a separator, and a positive electrode so as to have a shape having a hole; laminating the negative electrode, the separator, and the positive electrode to manufacture a unit cell; laminating at least two unit cells to form a laminate; folding a folding separator to cover an entire surface of the laminate to wrap an outside of the laminate; removing a portion of a space forming part that is a portion of the folding separator surrounding a space formed by the aligned holes when the folding separator is folded to wrap the laminate; and bonding surplus parts that are portions of the folding separator to each other after the portion of the space forming part is removed so as to finish the folding separator to cover an exposed surface of the laminate is provided.

A method for manufacturing an electrode assembly includes forming each of a negative electrode, a separator, and a positive electrode so as to have a shape having a hole; laminating the negative electrode, the separator, and the positive electrode to manufacture a unit cell; laminating at least two unit cells to form a laminate; folding a folding separator to cover an entire surface of the laminate to wrap an outside of the laminate; removing a portion of a space forming part that is a portion of the folding separator surrounding a space formed by the aligned holes when the folding separator is folded to wrap the laminate; and bonding surplus parts that are portions of the folding separator to each other after the portion of the space forming part is removed so as to finish the folding separator to cover an exposed surface of the laminate is provided.

An electrode assembly, comprises one or more first electrodes comprising a cathode; one or more second electrodes comprising an anode; and a separator sheet having a zigzag form interposed therebetween. The separator sheet comprises a first porous polymer substrate; a first coating layer formed on one surface of the first porous polymer substrate and comprising a polymer binder, the first coating layer being faced with the cathode; and a second coating layer formed on the other surface of the first porous polymer substrate and comprising a mixture a polymer binder and inorganic particles, the second coating layer being faced with the anode and having a composition, a thickness and a porosity different from those of the first porous coating layer. A separator has porous coating layers with a different composition, thickness or porosity formed on each surface thereof.

An electrode assembly, comprises one or more first electrodes comprising a cathode; one or more second electrodes comprising an anode; and a separator sheet having a zigzag form interposed therebetween. The separator sheet comprises a first porous polymer substrate; a first coating layer formed on one surface of the first porous polymer substrate and comprising a polymer binder, the first coating layer being faced with the cathode; and a second coating layer formed on the other surface of the first porous polymer substrate and comprising a mixture a polymer binder and inorganic particles, the second coating layer being faced with the anode and having a composition, a thickness and a porosity different from those of the first porous coating layer. A separator has porous coating layers with a different composition, thickness or porosity formed on each surface thereof.

A method for producing a lithium-ion cell is provided. The electrochemically active coating of an electrode is brought into contact with an electrolyte or an auxiliary liquid before a winding or cutting operation. This method is suitable in particular for continuously producing lithium-ion cells by means of processes proceeding at high speed, such as winding processes.

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.

Disclosed herein is an electrode assembly including a plurality of unit cells, each of which is configured to have a structure including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a single separation sheet disposed between the unit cells while surrounding side surfaces of the unit cells, wherein the unit cells include unit cells wound together with the separation sheet from one end of the separation sheet toward the middle of the separation sheet to constitute a first stack part, unit cells wound together with the separation sheet from the other end of the separation sheet toward the middle of the separation sheet to constitute a second stack part, and a facing unit cell having one surface that contacts the first stack part in the state in which the separation sheet is disposed between the one surface of the facing unit cell and the first stack part and the other surface that contacts the second stack part in the state in which the separation sheet is disposed between the other surface of the facing unit cell and the second stack part, and the unit cells are stacked such that electrodes having opposite polarities are disposed in contact with each other in the state in which the separation sheet is disposed between the respective electrodes.