# US 12,191,529 B2 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,529 B2 - Document ID: US12191529B2 - Status: Granted - Kind: B2 - Application number: 17/712,967 - Filed: 2022-04-04 - Published: 2022-07-21 - Granted: 2025-01-07 - Earliest claimed: 2019-10-10 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Moriaki Okuno; Yoshiichi Horikoshi; Taichi Katsumoto; Kazuki Honda - Web page: https://patentgrep.com/patent/US12191529B2 ## CPC - H01M 50/533: characterised by the shape of the leads or tabs - H01M 10/0427: {Button cells} - H01M 50/109: of button or coin shape - H01M 50/153: for button or coin cells - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection - H01M 50/531: Electrode connections inside a battery casing - H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges - H01M 50/548: on opposite sides of the cell - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A secondary battery includes a power generation element including a plurality of electrodes. The electrodes are stacked on each other in a stacking direction with a separator interposed therebetween. Each of the electrodes includes a current collector led out in a first direction intersecting the stacking direction. Each of a plurality of current collectors led out in the first direction includes an end part, and the end part includes a first bent part that is bent in a second direction intersecting the first direction. Each of a plurality of first bent parts overlaps and is in contact with an adjacent first bent part in the second direction. At least one of the first bent parts terminates at a middle point on an end face along the second direction of the power generation element. ## Claims ### Claim 1 A secondary battery comprising a power generation element including a plurality of electrodes, the electrodes being stacked on each other in a stacking direction with a separator interposed therebetween, wherein each of the electrodes includes a current collector led out in a first direction intersecting the stacking direction, each of a plurality of the current collectors led out in the first direction includes an end part, wherein the end part includes a first bent part that is bent in a second direction intersecting the first direction, each of a plurality of the first bent parts overlaps and is in contact with an adjacent first bent part in the second direction, at least one of the first bent parts terminates at a middle point on an end face along the second direction of the power generation element, and wherein the end part of each of one or more, but not all, of the current collectors led out in the first direction further includes a second bent part that is coupled to the first bent part and bent in a third direction to be along the power generation element, and wherein the third direction is opposite to the first direction. ### Claim 2 (depends on 1) The secondary battery according to claim 1, wherein respective lengths of the current collectors are equal. ### Claim 3 (depends on 1) The secondary battery according to claim 1, wherein the first bent parts each terminate at the middle point on the end face along the second direction, and positions of respective ends of the first bent parts are recessed toward a direction opposite to the second direction. ### Claim 4 (depends on 2) The secondary battery according to claim 2, wherein the first bent parts each terminate at the middle point on the end face along the second direction, and positions of respective ends of the first bent parts are recessed toward a direction opposite to the second direction. ### Claim 5 (depends on 1) The secondary battery according to claim 1, wherein positions of respective ends of a plurality of the second bent parts are recessed toward a direction opposite to the third direction. ### Claim 6 (depends on 1) The secondary battery according to claim 1, further comprising an electrode wiring line coupled to each of the first bent parts and the second bent parts. ### Claim 7 (depends on 5) The secondary battery according to claim 5, further comprising an electrode wiring line coupled to each of the first bent parts and the second bent parts. ### Claim 8 (depends on 6) The secondary battery according to claim 6, further comprising an outer package member that accommodates the power generation element, wherein the outer package member includes: a first outer package part having one of a positive polarity and a negative polarity; and a second outer package part opposed to the first outer package part in the stacking direction with the power generation element interposed therebetween, the second outer package part having another of the positive polarity and the negative polarity, the current collectors each have the positive polarity or the negative polarity, the second direction is a direction, for each of the current collectors, away from the first outer package part or the second outer package part, and the first outer package part or the second package part has a polarity opposite to the current collectors. ### Claim 9 (depends on 1) The secondary battery according to claim 1, further comprising an additional electrode stacked on the plurality of electrodes in the stacking direction with the separator interposed therebetween, wherein the additional electrode includes an additional current collector led out in the first direction, and the additional current collector led out in the first direction includes an end part including an additional bent part and coupled to each of the first bent parts and the second bent parts, wherein the additional bent part is bent in the second direction and thereafter bent in the third direction. ### Claim 10 (depends on 5) The secondary battery according to claim 5, further comprising an additional electrode stacked on the plurality of electrodes in the stacking direction with the separator interposed therebetween, wherein the additional electrode includes an additional current collector led out in the first direction, and the additional current collector led out in the first direction includes an end part including an additional bent part and coupled to each of the first bent parts and the second bent parts, wherein the additional bent part is bent in the second direction and thereafter bent in the third direction. ### Claim 11 (depends on 9) The secondary battery according to claim 9, wherein the second direction is a direction away from the additional electrode. ### Claim 12 (depends on 9) The secondary battery according to claim 9, wherein the additional current collector is exposed. ### Claim 13 (depends on 11) The secondary battery according to claim 11, wherein the additional current collector is exposed. ### Claim 14 (depends on 1) The secondary battery according to claim 1, comprising: positive electrodes including two or more of the electrodes; and negative electrodes including remaining two or more of the electrodes. ### Claim 15 (depends on 14) The secondary battery according to claim 14, wherein the first direction in each of the positive electrodes and the first direction in each of the negative electrodes are a common direction. ### Claim 16 (depends on 14) The secondary battery according to claim 14, wherein the first direction in each of the positive electrodes and the first direction in each of the negative electrodes are directions opposite to each other. ### Claim 17 (depends on 1) The secondary battery according to claim 1, further comprising an outer package member having a flat and columnar shape, wherein the outer package member is configured to accommodate the power generation element. ### Claim 18 (depends on 1) The secondary battery according to claim 1, wherein the secondary battery has a flat and columnar shape.