# US 10,483,519 B2 · Battery pack and battery pack manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,519 B2 - Document ID: US10483519B2 - Status: Granted - Kind: B2 - Application number: 15/769,804 - Filed: 2015-10-22 - Published: 2018-10-25 - Granted: 2019-11-19 - Earliest claimed: 2015-10-22 - Assignees: Envision AESC Japan Ltd. - Applicants: Nissan Motor Co., Ltd. - Inventors: Takao Iwasaki; Yasuhiro Yanagihara; Masayuki Nakai; Masahiro Nakamoto; Yusuke Tsuji; Manato Itabashi - Web page: https://patentgrep.com/patent/US10483519B2 ## CPC - H01M 50/557: Plate-shaped terminals - H01M 50/178: for pouch or flexible bag cells - H01M 50/211: adapted for pouch cells - H01M 50/291: characterised by their shape - H01M 50/503: characterised by the shape of the interconnectors - H01M 50/507: comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules - H01M 50/512: Connection only in parallel - H01M 50/55: on the same side of the cell - H01M 50/566: by welding, soldering or brazing - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A battery pack has a cell group and a bus bar. The cell group is stacking a plurality of unit cells in a thickness direction. The unit cells each includes a cell body having a power generation element and a flat shape, and an electrode tab protruding out from the cell body. The electrode tabs have distal end portions bent in a stacking direction of the unit cells. The flat plate shape bus bar connects the distal end portions of the electrode tabs of the unit cells while facing the distal end portions, and electrically connects the electrode tabs of at least two of the unit cells with each other. ## Claims ### Claim 1 A battery pack comprising: a cell group obtained by stacking a plurality of unit cells in a thickness direction, the unit cells each including a cell body having a power generation element and a flat shape, and an electrode tab protruding out from the cell body, and the electrode tabs having distal end portions bent in a stacking direction of the unit cells; and a flat plate shape bus bar connecting the distal end portions of the electrode tabs of the unit cells while facing the distal end portions, and electrically connecting the electrode tabs of at least two of the unit cells with each other, wherein: each of the distal end portions of the electrode tabs of at least two of the unit cells and a surface of the bus bar that faces the unit cells are in contact and welded to each other, the distal end portions of the electrode tabs that are electrically connected by the bus bar are bent in a same direction, the cell group comprises spacers disposed between the electrode tabs of the unit cells that are stacked, the spacers including supporting portions that abut the electrode tabs from an opposite side of the bus bar to support the distal end portions of the electrode tabs, and each of the spacers are attached to a respective one of the unit cells. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein the electrode tabs are each formed by being bent in an L shape from proximal end portions adjacent to the cell bodies to the distal end portions as seen from a side of the unit cells, and are each mutually joined where flat portions of the distal end portions and the bus bar overlap. ### Claim 3 (depends on 1) The battery pack according to claim 1, wherein the spacers include recesses having an opening along a direction that intersects with the stacking direction in positions corresponding to welding areas of the bus bar and the electrode tabs. ### Claim 4 (depends on 3) The battery pack according to claim 3, wherein the recesses seal at least a portion of a periphery of the welding areas of the electrode tabs. ### Claim 5 (depends on 4) The battery pack according to claim 4, wherein the recesses each includes a bottom surface positioned on a lower side of the stacking direction of the unit cells that is larger than a top surface positioned on an upper side of the stacking direction of the unit cells. ### Claim 6 (depends on 1) The battery pack according to claim 1, wherein the bus bar electrically connects the electrode tabs on a positive electrode side of one group of the unit cells in parallel, and electrically connects the electrode tabs on a negative electrode side of another group of the unit cells in parallel. ### Claim 7 (depends on 1) The battery pack according to claim 1, wherein the bus bar includes a first bus bar bonded to the electrode tabs on the positive electrode side of one of the unit cells, and a second bus bar bonded to the electrode tabs on the negative electrode side of another of the unit cells. ### Claim 8 (depends on 7) The battery pack according to claim 7, further comprising a bus bar holder for integrally holding the first bus bar and the second bus bar. ### Claim 9 (depends on 8) The battery pack according to claim 8, wherein the bus bar holder comprises an insulating portion having insulating properties that protrudes between the bus bars that are adjacent along the stacking direction. ### Claim 10 (depends on 1) The battery pack according to claim 1, wherein each of the electrode tabs on the positive electrode side and the negative electrode side of the unit cells protrudes out from one edge from among edges of the cell body, and the electrode tabs of all of the unit cells are disposed on a same side.