# US 7,609,033 B2 · Battery temperature controller for electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,033 B2 - Document ID: US7609033B2 - Status: Granted - Kind: B2 - Application number: 11/641,077 - Filed: 2006-12-19 - Published: 2007-07-05 - Granted: 2009-10-27 - Earliest claimed: 2006-01-04 - Assignees: Honda Motor Co., Ltd. - Inventors: Takahiro Sasaki; Teruo Wakashiro - Web page: https://patentgrep.com/patent/US7609033B2 ## CPC - B60H 1/00278: {for the battery} - B60H 1/00392: {for electric vehicles having only electric drive means} - B60K 1/04: of the electric storage means for propulsion - B60L 58/15: Preventing overcharging - B60L 58/16: responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH] - B60L 58/25: by controlling the electric load - B60L 58/26: by cooling - B60H 2001/003: {Component temperature regulation using an air flow} - B60K 2001/005: {the electric storage means} - B60L 2240/545: Temperature - B60L 2260/56: Temperature prediction, e.g. for pre-cooling - B60W 2510/244: Charge state - B60W 2510/246: Temperature - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - 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 - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A controller in the electric vehicle is provided in which data which are criteria to determine a magnitude of degradation tendency of a high-voltage secondary cell are stored in a ROM in a high-voltage battery electrical controller. When it is detected that an ignition switch is turned off, the magnitude of the degradation tendency is determined depending on a temperature of the high-voltage secondary cell and a state of charge value based on the data. When it is determined that the degradation tendency is large, the battery fan and the air conditioner are operated so that the state of charge value and the temperature decrease. Next, while repeating determination of the magnitude of the degradation tendency, when it is determined that the degradation tendency is small, the operation of the battery fan and the air conditioner is stopped. Therefore, the state of charge value is prevented from decreasing more than necessary. ## Claims ### Claim 1 A controller installed in an electric vehicle comprising: a storage battery which stores power to be supplied to a drive motor; a temperature sensor which detects a temperature of the storage battery; a state of charge value sensor which detects a state of charge value of the storage battery; a fan which cools the storage battery; and an air conditioner which has an electric compressor driven by the power supplied from the storage battery, the controller which controls operation of at least one of the fan and the electric compressor, comprising a cooling control means which cools the storage battery by means of selectively or simultaneously driving at least one of the fan and the air conditioner after detecting a stop request of the electric vehicle, depending on the temperature detected by the temperature sensor and the state of charge value detected by the state of charge value sensor. ### Claim 2 (depends on 1) The controller installed in the electric vehicle as claimed in claim 1, wherein if the state of charge value detected by the state of charge value sensor exceeds a predetermined state of charge value set corresponding to the temperature detected by the temperature sensor, the cooling control means selectively or simultaneously drives at least one of the fan and the air conditioner. ### Claim 3 (depends on 1) The controller installed in the electric vehicle as claimed in claim 1, wherein if the temperature detected by the temperature sensor exceeds a predetermined temperature and the state of charge value detected by the state of charge value sensor exceeds a predetermined state of charge value, the cooling control means selectively or simultaneously drives at least one of the fan and the air conditioner. ### Claim 4 (depends on 2) The controller installed in the electric vehicle as claimed in claim 2, wherein if the state of charge value detected by the state of charge value sensor exceeds a predetermined state of charge value set corresponding to the temperature detected by the temperature sensor, the cooling control means drives the fan, and if the state of charge value detected by the state of charge value sensor exceeds the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor and at least one of the temperature detected by the temperature sensor and the state of charge value detected by the state of charge value sensor exceeds a respective predetermined value, the cooling control means drives the fan and the air conditioner together. ### Claim 5 (depends on 2) The controller installed in the electric vehicle as claimed in claim 2, wherein if the state of charge value detected by the state of charge value sensor exceeds a first predetermined state of charge value set corresponding to the temperature detected by the temperature sensor, the cooling control means drives the fan, and if the state of charge value further exceeds a second predetermined state of charge value exceeding the first predetermined state of charge value, the cooling control means drives the fan and the air conditioner together. ### Claim 6 (depends on 2) The controller installed in the electric vehicle as claimed in claim 2, wherein the relatively higher the temperature is, the lower the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is, and the relatively lower the temperature is, the higher the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is. ### Claim 7 (depends on 1) The controller installed in the electric vehicle as claimed in claim 1, wherein the storage battery includes a lithium-ion battery. ### Claim 8 (depends on 4) The controller installed in the electric vehicle as claimed in claim 4, wherein the relatively higher the temperature is, the lower the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is, and the relatively lower the temperature is, the higher the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is. ### Claim 9 (depends on 5) The controller installed in the electric vehicle as claimed in claim 5, wherein the relatively higher the temperature is, the lower the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is, and the relatively lower the temperature is, the higher the predetermined state of charge value set corresponding to the temperature detected by the temperature sensor is.