# US 12,015,173 B2 · Busbar assembly and cylindrical power battery module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,173 B2 - Document ID: US12015173B2 - Status: Granted - Kind: B2 - Application number: 18/016,071 - Filed: 2022-10-24 - Published: 2024-03-21 - Granted: 2024-06-18 - Earliest claimed: 2022-01-25 - Assignees: Eve Power Co., Ltd. - Applicants: Eve Power Co., Ltd. - Inventors: Guojiang Zhang - Web page: https://patentgrep.com/patent/US12015173B2 ## CPC - H01M 50/507: comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules - H01M 10/486: {for measuring temperature} - H01M 10/637: characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching (means for preventing undesired use or discharge H01M50/572) - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) - H01M 50/262: with fastening means, e.g. locks - H01M 50/502: Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing - H01M 50/503: characterised by the shape of the interconnectors - H01M 50/509: characterised by the type of connection, e.g. mixed connections - H01M 50/519: comprising printed circuit boards [PCB] - H01M 50/522: Inorganic material - H01M 50/526: having a layered structure - H01M 50/583: in response to current, e.g. fuses - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2200/105: NTC - 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 Provided are a busbar assembly and a cylindrical power battery module. The busbar assembly is used for electrical connection of a cylindrical power battery module. The cylindrical power battery module includes an input copper bar, an output cooper bar and a cells contact system assembly having the corresponding number as submodules. The input copper bar is connected to a cell unit at an input terminal of the cylindrical power battery module, the output copper bar is connected to a cell unit at an output terminal of the cylindrical power battery module, and the cells contact system assemblies are connected in series and in parallel to cell units of the submodules. ## Claims ### Claim 1 A busbar assembly for electrical connection of a cylindrical power battery module, wherein the cylindrical power battery module comprises at least one submodule, a submodule of the at least one submodule comprises a plurality of cell units, and the busbar assembly comprises: an input copper bar, wherein the input copper bar is connected to a cell unit at an input terminal of the cylindrical power battery module; an output copper bar, wherein the output copper bar is connected to a cell unit at an output terminal of the cylindrical power battery module; and a cells contact system assembly having a corresponding number as the at least one submodule, wherein one submodule is correspondingly connected to one cells contact system assembly to form an electrical unit group, the cells contact system assembly comprises at least one connection piece, a connection piece of the at least one connection piece comprises a plurality of conductive units and a plurality of connection portions, conductive units disposed adjacently at intervals in a first direction are connected through connection portions of the plurality of connection portions, the plurality of conductive units are connected in parallel to cell units disposed adjacently in the first direction, and the plurality of conductive units are connected in series to cell units disposed adjacently in a second direction, wherein a conductive unit of the plurality of conductive units is provided with a convex portion, and the convex portion forms a first buffer portion. ### Claim 2 (depends on 1) The busbar assembly according to claim 1, wherein a first fuse structure is disposed on the first buffer portion. ### Claim 3 (depends on 1) The busbar assembly according to claim 1, wherein a thickness of the connection piece ranges from 0.2 millimeters to 0.4 millimeters. ### Claim 4 (depends on 1) The busbar assembly according to claim 1, wherein the connection piece comprises a first insulating layer, and the first insulating layer is disposed on one side of the connection piece facing the plurality of cell units. ### Claim 5 (depends on 1) The busbar assembly according to claim 1, wherein the cell unit of the plurality of cell units comprises a positive electrode and a negative electrode, the negative electrode is disposed on an end face of the cell unit, the positive electrode and the negative electrode are disposed on a same side, the positive electrode comprises a cylindrical protrusion a conductive unit of the plurality of conducive units is provided with a first avoiding groove, and the first avoiding groove is capable of avoiding the cylindrical protrusion. ### Claim 6 (depends on 1) The busbar assembly according to claim 1, wherein a connection portion of the plurality of connection portions is a planar structure; or a connection portion of the plurality of connection portions is a protruding structure, and the connection portion comprises a second buffer portion; wherein a second fuse structure is disposed on the connection portion; or the second buffer portion is provided with a second fuse structure. ### Claim 7 (depends on 1) The busbar assembly according to claim 1, wherein a conductive unit of the plurality of conductive units comprises a first connection region and a second connection region, and the first connection region and the second connection region are connected to two cell units disposed adjacently in the first direction, respectively; wherein the first connection region and the second connection region have different heights in a third direction; or the first connection region comprises a second insulating layer, the second connection region comprises a third insulating layer, the second insulating layer is configured to insulate part other than a connection between the first connection region and a cell unit of the two cell units, and the third insulating layer is configured to insulate part other than a connection between the second connection region and an other cell unit of the two cell units. ### Claim 8 (depends on 1) The busbar assembly according to claim 1, wherein at least one of the input copper bar and the output copper bar is a variable cross-section copper bar, the input copper bar and the output copper bar each comprise a first end portion and a second end portion, the first end portion of the input copper bar is connected to the cell unit at the input terminal of the cylindrical power battery module, and the first end portion of the output copper bar is connected to the cell unit at the output terminal of the cylindrical power battery module. ### Claim 9 (depends on 8) The busbar assembly according to claim 8, wherein a thickness of the first end portion is less than a thickness of the second end portion, the thickness of the first end portion ranges from 0.2 millimeters to 0.4 millimeters, and the thickness of the second end portion ranges from 3 millimeters and 5 millimeters. ### Claim 10 The busbar assembly according to 8, wherein the first end portion comprises input connection portions having a corresponding number as conductive units on a same connection piece. ### Claim 11 (depends on 8) The busbar assembly according to claim 8, wherein the first end portion is a planar structure; or the first end portion is a protruding structure and comprises a third buffer portion; wherein the first end portion is provided with a third fuse structure; or a third fuse structure is disposed on the third buffer portion. ### Claim 12 (depends on 1) The busbar assembly according to claim 1, wherein one submodule is provided, the input terminal of the cylindrical power battery module is a cell unit at a first end of the one submodule, and the output terminal of the cylindrical power battery module is a cell unit at a second end of the one submodule. ### Claim 13 (depends on 1) The busbar assembly according to claim 1, wherein a plurality of submodules are provided, the cells contact system assembly (20) further comprises a connection copper bar (500), and the connection copper bar (500) connects adjacent submodules of the plurality of submodules other than the input terminal of the cylindrical power battery module and the output terminal of the cylindrical power battery module. ### Claim 14 (depends on 13) The busbar assembly according to claim 13, wherein the plurality of submodules are disposed at intervals in the first direction, the input terminal of the cylindrical power battery module is a cell unit at an end of a first submodule in the first direction, and the output terminal of the cylindrical power battery module is a cell unit at an end of a last submodule in the first direction. ### Claim 15 (depends on 13) The busbar assembly according to claim 13, wherein the connection copper bar comprises a copper bar body and a third end portion and a fourth end portion which are connected to the copper bar body, and the third end portion and the fourth end portion are connected to cell units of the submodules disposed adjacently, respectively; wherein the third end portion comprises third end connection portions having a corresponding number as conductive units on a same connection piece, and the fourth end portion comprises fourth end connection portions having a corresponding number as conductive units on a same connection piece; wherein at least one of the third end portion and the fourth end portion is a planar structure; or at least one of the third end portion and the fourth end portion is a protruding structure, and at least one of the third end portion and the fourth end portion comprises a fourth buffer portion; and wherein a fourth fuse structure is disposed on the third end portion; or the fourth buffer portion is provided with a fourth fuse structure. ### Claim 16 (depends on 15) The busbar assembly according to claim 15, wherein a thickness of the third end portion and a thickness of the fourth end portion are each less than a thickness of the copper bar body; wherein the thickness of the third end portion and the thickness of the fourth end portion are each range from 0.2 millimeters to 0.4 millimeters, and the thickness of the copper bar body ranges from 3 millimeters to 5 millimeters. ### Claim 17 A cylindrical power battery module, comprising a busbar assembly and at least one submodule, wherein each submodule of the at least one submodule comprises a plurality of cell units, and the busbar assembly is configured to connect the plurality of cell units; the busbar assembly comprises: an input copper bar, wherein the input copper bar is connected to a cell unit at an input terminal of the cylindrical power battery module; an output copper bar, wherein the output copper bar is connected to a cell unit at an output terminal of the cylindrical power battery module; and a cells contact system assembly having a corresponding number as the at least one submodule, wherein one submodule is correspondingly connected to one cells contact system assembly to form an electrical unit group, the cells contact system assembly comprises at least one connection piece, a connection piece of the at least one connection piece comprises a plurality of conductive units and a plurality of connection portions, conductive units disposed adjacently at intervals in a first direction are connected through connection portions of the plurality of connection portions, the plurality of conductive units are connected in parallel to cell units disposed adjacently in the first direction, and the plurality of conductive units are connected in series to cell units disposed adjacently in a second direction, wherein a connection portion of the plurality of connection portions is a planar structure; or a connection portion of the plurality of connection portions is a protruding structure, and the connection portion comprises a second buffer portion. ### Claim 18 (depends on 17) The cylindrical power battery module according to claim 17, comprising a flexible printed circuit and a battery management system, wherein the flexible printed circuit is connected to the cells contact system assembly, the flexible printed circuit is provided with an output plug, and the output plug is inserted on the battery management system. ### Claim 19 (depends on 18) The cylindrical power battery module according to claim 18, comprising a negative temperature coefficient thermistor, wherein the negative temperature coefficient thermistor is disposed on cell units, and the negative temperature thermistor is connected to the flexible printed circuit. ### Claim 20 (depends on 17) The cylindrical power battery module according to claim 17, further comprising a plastic bracket disposed between the cells contact system assembly and cell units, and the plastic bracket is configured to secure the input copper bar, the output copper bar and the cells contact system assembly.