# US 2015/0104680 A1 · System and method for operating a battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0104680 A1 - Document ID: US20150104680A1 - Status: Published application - Kind: A1 - Application number: 14/054,710 - Filed: 2013-10-15 - Published: 2015-04-16 - Earliest claimed: 2013-10-15 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Xu Wang; Chuan He; Xiaoguang Chang - Web page: https://patentgrep.com/patent/US20150104680A1 ## CPC - B60L 58/26: by cooling - B60L 1/003: {to auxiliary motors, e.g. for pumps, compressors} - B60L 50/66: {Arrangements of batteries} - 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 - H01M 10/486: {for measuring temperature} - H01M 10/617: for achieving uniformity or desired distribution of temperature - B60L 2240/545: Temperature - B60L 2240/547: Voltage - B60L 2240/549: Current - H01M 10/443: {in response to temperature} - H01M 10/625: Vehicles - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - 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 - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Systems and methods for operating a battery pack supplying power to propel a vehicle are disclosed. One example method comprises, determining a difference between an estimated battery pack temperature and a sensed battery pack temperature as a basis for adjusting battery pack output power. The method also includes adjusting a speed of a cooling fan based on the difference between estimated battery pack temperature and sensed battery pack temperature. ## Claims ### Claim 1 A system for operating a battery pack of a vehicle, comprising: a battery pack including a temperature sensor; and a controller including non-transitory instructions for adjusting battery pack output power in response to a comparison of an estimated battery pack temperature and a battery pack temperature determined via the temperature sensor. ### Claim 2 (depends on 1) The system of claim 1, further comprising additional instructions for indicating battery pack degradation in response to the comparison. ### Claim 3 (depends on 1) The system of claim 1, where the comparison includes subtracting estimated battery pack temperature from the battery pack temperature determined via the temperature sensor or vice-versa. ### Claim 4 (depends on 1) The system of claim 1, where the estimated battery pack temperature is based on battery pack fan speed, and further comprising additional instructions for indicating degradation of the temperature sensor based on other temperature sensors when one or more inputs to estimated battery pack temperature is degraded. ### Claim 5 (depends on 4) The system of claim 4, where the estimated battery pack temperature is further based on battery current and voltage. ### Claim 6 (depends on 5) The system of claim 5, where the estimated battery pack temperature is further based on battery pack thermal capacity. ### Claim 7 (depends on 1) The system of claim 1, where battery pack output power is adjusted via a current limiting device. ### Claim 8 A system for operating a battery pack of a vehicle, comprising: a battery pack including a temperature sensor; and a controller including non-transitory instructions for adjusting battery pack fan speed or pump speed in response to a comparison of an estimated battery pack temperature and a battery pack temperature determined via the temperature sensor. ### Claim 9 (depends on 8) The system of claim 8, further comprising additional instructions for adjusting battery pack output power in response to the comparison, and additional instructions for determining battery pack thermal leakage based on the estimated battery pack temperature and a pattern of temperature sensors. ### Claim 10 (depends on 8) The system of claim 8, where the comparison includes subtracting estimated battery pack temperature from the battery pack temperature determined via the temperature sensor or vice-versa. ### Claim 11 (depends on 8) The system of claim 8, where battery pack fan speed or pump speed is increased as estimated battery pack temperature approaches a battery pack operating range higher temperature threshold. ### Claim 12 (depends on 8) The system of claim 8, where battery pack fan speed or pump speed is decreased as estimated battery pack temperature approaches a battery pack operating range lower temperature threshold. ### Claim 13 (depends on 8) The system of claim 8, where estimated battery pack temperature is based on an open circuit battery voltage. ### Claim 14 A method for operating a battery pack, comprising: adjusting output power of a battery pack in response to a difference between an estimated battery pack temperature and output of a battery pack temperature sensor. ### Claim 15 (depends on 14) The method of claim 14, further comprising adjusting speed of a battery pack cooling fan in response to the difference. ### Claim 16 (depends on 14) The method of claim 14, where the estimated battery pack temperature is based on battery pack voltage. ### Claim 17 (depends on 16) The method of claim 16, where the estimated battery pack temperature is further based on battery pack output current. ### Claim 18 (depends on 17) The method of claim 17, where the estimated battery pack temperature is further based on battery pack cooling fan speed. ### Claim 19 (depends on 14) The method of claim 14, where adjusting output power of the battery pack is performed when the difference is greater than a threshold temperature. ### Claim 20 (depends on 14) The method of claim 14, where the estimated battery pack temperature is filtered via a first order filter.