# US 11,309,578 B2 · Power supply system and method for controlling same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,578 B2 - Document ID: US11309578B2 - Status: Granted - Kind: B2 - Application number: 16/087,503 - Filed: 2017-03-13 - Published: 2019-04-04 - Granted: 2022-04-19 - Earliest claimed: 2016-03-22 - Assignees: Nissan Motor Co., Ltd. - Applicants: Nissan Motor Co., Ltd. - Inventors: Tomoyuki Koike; Munemitsu Watanabe; Akifumi Koishi; Masahiko Tahara; Terumasa Tsuchiya; Atsushi Tezuka - Web page: https://patentgrep.com/patent/US11309578B2 ## CPC - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - B60R 16/033: characterised by the use of electrical cells or batteries (for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36) - G06F 1/263: {Arrangements for using multiple switchable power supplies, e.g. battery and AC (G06F1/30 takes precedence)} - H01M 10/12: Construction or manufacture - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H02J 7/1423: {with multiple batteries} - H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) - H02J 7/448: {using switches, contacts or markings, e.g. optical, magnetic or barcode} - H01M 2200/108: Normal resistors - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - H02J 2105/33: exchanging power with road vehicles - H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power supply system that is mountable on a vehicle includes a lithium-ion storage battery connected to an electrical load via two paths being a first path and a second path, a power generator capable of charging the lithium-ion storage battery, a first switch provided on the first path, an electrical resistance element provided on the second path, and a controller configured to control on/off of the power generator and perform on/off control of the first switch. According to a voltage increase request from the electrical load, the controller is configured to turn of the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut. ## Claims ### Claim 1 A power supply system that is mountable on a vehicle, the power supply system comprising: a lithium-ion storage battery connected to an electrical load via a first path and a second path; a power generator capable of charging the lithium-ion storage battery; a first switch provided on the first path; an electrical resistance element provided on the second path; and a controller configured to control on/off of the power generator and perform on/off control of the first switch, wherein, according to a voltage increase request from the electrical load, the controller is configured to turn on the electrical resistance element such that the electrical load proceeds via the second path in addition to via the first path, wherein the controller is configured to turn off the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut, and wherein, after the switching off and after a predetermined time, the controller is configured to switch the power generator to a power generation mode in which an input voltage of the electrical load increases such that a power generated by the power generator is supplied to the lithium-ion storage battery through the second path. ### Claim 2 (depends on 1) The power supply system according to claim 1, wherein the controller comprises a determination unit configured to determine presence or absence of the voltage increase request; and wherein, when the determination unit has determined that the voltage increase request is present, the controller is configured to turn off the first switch, and then switch the power generator to the power generation mode. ### Claim 3 (depends on 1) The power supply system according to claim 1, wherein the first switch is formed by at least one of two relays. ### Claim 4 (depends on 3) The power supply system according to claim 3, wherein one end of the second switch is directly or indirectly connected between the two relays. ### Claim 5 (depends on 3) The power supply system according to claim 3, wherein one end of the second switch is connected between one of the two relays of the first switch and the lithium-ion storage battery. ### Claim 6 (depends on 1) The power supply system according to claim 1, wherein the electrical resistance element is formed by an electrical resistance element with a fixed resistance value, a harness resistance of the second path, or a current sensor. ### Claim 7 A method for controlling a power supply system including: a lithium-ion storage battery connected to an electrical load via a first path and a second path; a power generator configured to charge the lead-acid storage battery and the lithium-ion storage battery; a first switch provided on the first path; and an electrical resistance provided on the second path, the method comprising the steps of: the voltage proceeding via the first path; determining presence or absence of a voltage increase request from the electrical load; turning on the electrical resistance element such that the electrical load proceeds via the first and the second paths; turning off the first switch when having determined that the voltage increase request is present so that a power supply to the lithium-ion storage battery through the first path from the power generator is cut; and switching, after the switching off and after a predetermined time, the power generator to a power generation mode in which an input voltage of the electrical load increases such that a power from the power generator to the lithium-ion storage battery through the second path. ### Claim 8 (depends on 1) The power supply system according to claim 1, further comprising: a lead-acid storage battery which is connected to the electrical load, the lead-acid storage battery having different charge and discharge characteristics from the lithium-ion storage battery and the lead-acid storage battery connected to the electrical load in parallel with the lithium-ion storage battery, wherein the second switch is provided on the second path and is configured to be controlled by the controller, and wherein a resistance value of the electrical resistance element is greater than a harness resistance of the first path.