# US 7,745,039 B2 · System and method for controlling a rechargeable battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,745,039 B2 - Document ID: US7745039B2 - Status: Granted - Kind: B2 - Application number: 11/463,345 - Filed: 2006-08-09 - Published: 2007-04-12 - Granted: 2010-06-29 - Earliest claimed: 2005-08-09 - Assignees: Saft - Inventors: Christophe Morin; Serge Maloizel; Claude Chanson - Web page: https://patentgrep.com/patent/US7745039B2 ## CPC - H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)} - B60L 58/15: Preventing overcharging - G01R 31/396: Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery - H02J 7/50: acting upon multiple batteries simultaneously or sequentially - H02J 7/80: including monitoring or indicating arrangements - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control system for a rechargeable battery including at least two electrochemical generators electrically connected by a power line. The system includes a protection unit and at least two control units respectively connected to the terminals of each electrochemical generator. Each control unit is designed to measure at least one operating parameter pertaining to the generator and to command the protection unit by transmission of carrier currents on the power line. The control system dispenses with the master processor for commanding the battery protection units and reduces the connecting wires by dispensing with the measurement leads designed to transmit the measurements of the operating parameters of each generator to the master processor. ## Claims ### Claim 1 Control system for a rechargeable battery comprising at least two electrochemical generators electrically connected by a power line, the system comprising: a protection unit; at least two control units, respectively connected to the terminals of each electrochemical generator, each control unit measuring at least one operating parameter pertaining to the said generator and commanding the protection unit by transmission of carrier currents on the power line. ### Claim 2 (depends on 1) System according to claim 1, wherein the operating parameter measured by each control unit is chosen from the voltage at the terminals of the generator and/or the temperature in the generator and/or the current passing through the generator. ### Claim 3 (depends on 1) System according to claim 1, wherein each control unit comprises an electronic element designed to compare the parameter measured with a predetermined threshold and designed to command the transmission of a signal to the protection unit when the said parameter exceeds the predetermined threshold. ### Claim 4 (depends on 1) System according to claim 1, wherein each control unit comprises a frequency oscillator and a current generator in such a way as to produce high frequency current pulses transmitted on the power line. ### Claim 5 (depends on 1) System according to claim 1, wherein the protection unit commands a switch placed on the power line. ### Claim 6 (depends on 5) System according to claim 5, wherein the switch is designed to interrupt the charging and/or discharging of the battery. ### Claim 7 (depends on 1) System according to claim 1, wherein each control unit comprises a current sensor detecting the passage of current in the power line and a switch commanded by the said sensor, each unit being switched into standby mode when the current in the power line is below a predetermined value. ### Claim 8 (depends on 7) System according to claim 7, wherein standby mode, the control unit interrupts the measurement of the operating parameter of the generator. ### Claim 9 (depends on 1) System according to claim 1, wherein each control unit is designed to detect conditions in which the generator charging is complete, and to command diversion of the current locally. ### Claim 10 (depends on 1) System according to claim 1, wherein it does not comprise a master processor for all of the operating parameters measured at the terminals of each electrochemical generator. ### Claim 11 Rechargeable battery comprising at least two electrochemical generators electrically connected by a power line, wherein it comprises a control system comprising: a protection unit; at least two control units, respectively connected to the terminals of each electrochemical generator, each control unit being designed to measure at least one operating parameter pertaining to the said generator and to command the protection unit by transmission of carrier currents on the power line. ### Claim 12 (depends on 11) Battery according to claim 11, wherein each electrochemical generator is chosen from a group comprising at least lithium ion generators, silver zinc generators, polymer generators, alkaline accumulators (Ni Cad, Ni-MH) and lead technology batteries. ### Claim 13 Method for the control of the voltage of a battery comprising at least two electrochemical generators electrically connected by a power line, the method comprising the following steps: measurement of at least one operating parameter pertaining to each electrochemical generator, by a control unit connected to the terminals of the said generator; detection of abnormal operating conditions by the said control unit; transmission of a command signal to stop operation to a battery protection unit, comprising the steps of emission by the said control unit of carrier currents on the power line and reception of the said carrier currents by the protection unit; interruption of the charging and/or discharging of the battery by the said protection unit. ### Claim 14 (depends on 13) Method according to claim 13, wherein the measurement step consists of measuring the voltage at the terminals of the generator and/or the temperature in the generator and/or the current passing through the generator. ### Claim 15 (depends on 13) Method according to claim 13, wherein the step of detection of abnormal operating conditions comprises a step of comparison of the operating parameter measured with a predetermined threshold. ### Claim 16 (depends on 15) Method according to claim 15, wherein the step of emission of a command to stop operation consists of generating high frequency current pulses and sending these pulses on the power line. ### Claim 17 (depends on 13) Method according to claim 13, further comprising one of the following steps: measurement of the current passing through the power line by each control unit; placing the control unit in standby when the current measured is below a predetermined value.