A nonaqueous electrolyte secondary battery using a silicon compound as a negative electrode active material, suppress deformation of a negative electrode. An embodiment includes a winding type electrode body in which a positive electrode and a negative electrode are spirally wound with at least one separator interposed therebetween. In a negative electrode mixture layer, a silicon compound is contained as a negative electrode active material. A winding-start side end of the negative electrode mixture layer extends to a winding-start end side of the electrode body past a winding-start side end of a positive electrode mixture layer. A length Y (mm) of a portion of the negative electrode mixture layer extending from the winding-start side end of the positive electrode mixture layer and a rate X (percent by mass) of the silicon compound with respect to the total mass of the negative electrode active material satisfy a relationship of Y≥3X−15 (6≤X≤15).

An apparatus for manufacturing an electrode assembly according to the present invention includes a conveyor configured to allow an electrode to travel; and a cutter configured to cut the traveling electrode to a predetermined size, wherein the cutter comprises: an upper cutting blade disposed above the electrode; an upper eccentric driver configured to eccentrically drive the upper cutting blade; a lower cutting blade disposed below the electrode in a direction corresponding to the upper cutting blade; and a lower eccentric driver configured to eccentrically drive the lower cutting blade.

The present invention relates to a flag forming device after laser notching of a secondary battery for an electric vehicle, and particularly, to a flag forming device after laser notching of a secondary battery for an electric vehicle configured by stacking electrode rolls within a circular box, which makes a flag shape by notching an uncoated portion having no coating of a negative electrode and a positive electrode with a laser, and makes the uncoated flag made by laser notching pass through a flag forming unit before winding to enable an uncoated tap to be folded inward. The present invention includes a flag forming device after laser notching of a secondary battery for an electric vehicle of the present invention including a tilt EPC unit 1 which moves a pole plate while maintaining a material uniformly and constantly at a setting value of an EPC sensor when the pole plate is moved, the EPC sensor 2 which numerically indicates the degree of distortion when the pole plate is moved through the tilt EPC unit 1, a flag forming unit 3 which molds a flag of the pole plate moved through the EPC sensor 2, an encoder roller 4 which measures a movement distance of the pole plate passing through the flag forming unit 3, a winding unit 5 which winds an electrode that has passed through the flag forming unit 3, and an air nozzle 6 which blows air before an uncoated flag is wound in the winding unit 5 to enable an uncoated tab to be folded inward.

The invention relates to a button lithium ion battery, a preparation method thereof, and a method of producing a lithium ion cell composite flat sheet, wherein the button lithium ion battery comprises a battery housing, a cell accommodated in the battery housing and an electrolyte filled in the battery housing; the cell is formed by winding a composite flat sheet in which a first separator, a positive piece, a second separator and a negative piece are sequentially stacked and hot-laminated to form an integrated structure. The cell of the button lithium ion battery is formed by winding a composite flat sheet, so that winding efficiency can be improved, and misalignment can be avoided; moreover, chances of hand contact can be reduced, the influence of dust and water vapor can be avoided, and the quality of the lithium battery can be improved to the maximum extent.

The invention relates to a cell coil (30, 40, 50, 60, 100, 200) for a lithium-ion battery, comprising at least two sub-cells (10, 32, 42, 44, 52, 54, 68, 70, 80, 82), which are wound in a space-saving manner and are thermally coupled to each other. According to the invention, the at least two sub-cells (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) are electrically connected in parallel in normal operation, and, in the event of a fault, in particular in the event of an internal short circuit in at least one defective sub-cell (10, 32, 42, 44, 52, 54, 68, 70, 80, 82), at least one defective sub-cell (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) can be electrically separated from the at least one intact sub-cell (10, 32, 42, 44, 52, 54, 68, 70, 80, 82). Because of the at least one defective sub-cell (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) that can be immediately electrically separated from the intact sub-cells (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) by means of an electronic monitoring device (36) in the “event of a fault”, a high level of robustness of the cell coil (30, 40, 50, 60, 100, 200) in respect of internal short circuits is achieved. Among other things, the intact sub-cells (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) act, because of the thermal coupling between the sub-cells (10, 32, 42, 44, 52, 54, 68, 70, 80, 82), as a damage-reducing heat sink for the waste heat that is released during the fast discharge of the affected defective sub-cell (10, 32, 42, 44, 52, 54, 68, 70, 80, 82) generally occurring in the event of a short circuit.

The invention relates to a battery cell (2), comprising a prismatically designed cell housing with a cover surface (31), on which a negative terminal (11) and a positive terminal (12) are arranged, and an electrode coil (10) arranged within the cell housing and comprising a cathode (14) and an anode (16). The electrode coil (10) is fixed to the cover surface (31) by means of an electrically insulating holder (70), and the holder (70) is connected to at least one electrically insulating spacer (67, 68) which is fastened to the cover surface (31). The invention also relates to a battery system which comprises at least one battery cell (2) according to the invention.

The invention relates to a battery cell (2), comprising a prismatically designed cell housing (3) with a cover surface (31), on which a negative terminal (11) and a positive terminal (12) are arranged, and at least one electrode coil (10) which is arranged inside the cell housing (3) and comprises a cathode (14) having cathode contact lugs (24) and an anode (16) having anode contact lugs (26). The cathode contact lugs (24) and the anode contact lugs (26) extend next to one another from the electrode coil (10) toward exactly one end face (35, 36) of the cell housing (3), the end face (35, 36) running at a right angle to the cover surface (31). The invention also relates to a battery system comprising at least one battery cell (2) according to the invention.

The present disclosure relates a battery, including an electrode assembly, a first tab, a second tab, a cap plate assembly, a first electrode terminal, a second electrode terminal and a shaping plate. The electrode assembly includes a first electrode plate, a second electrode plate and a separator arranged between the first electrode plate and the second electrode plate; each of the first electrode terminal and the second electrode terminal is arranged on the cap plate assembly; the first electrode terminal is connected to the first electrode plate through the first tab; the second electrode terminal is connected to the second electrode plate through the second tab; the shaping plate is arranged between the cap plate assembly and the electrode assembly, and each of the first tab and the second tab is bent around the shaping plate; the shaping plate is fixed and thermally fused to the cap plate assembly.

An end cover assembly, a battery cell and an electrolyte injection method therefor, a battery, and a power consumption device are provided. The end cover assembly may include an end cover provided with a through hole for injecting an electrolyte and an accommodating portion; a seal configured to seal the through hole; and a cover body covering at least part of the seal, the cover body including a limiting portion, the limiting portion being located within the accommodating portion to restrict the cover body from separating from the end cover, and the cover body being movable together with the seal by movement of the limiting portion relative to the accommodating portion, wherein when the cover body moves to a first position, the seal covers the through hole, and when the cover body moves to a second position, the seal avoids the through hole.

An exemplary embodiment of the present invention provides a spiral-wound electrode assembly including: a negative electrode and a positive electrode, each of which is configured to include a substrate, and a first composite material and a second composite material formed on opposite surfaces of the substrate; and a separator disposed between the negative electrode and the anode, wherein the first composite material of the negative electrode is disposed farther away from a center of the electrode assembly than the second composite material of the negative electrode, and the first composite material of the negative electrode is oriented with respect to a first surface of the substrate of the negative electrode.