# US 9,520,621 B2 · Method for detecting a triggering of a security device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,621 B2 - Document ID: US9520621B2 - Status: Granted - Kind: B2 - Application number: 14/124,379 - Filed: 2012-06-04 - Published: 2014-05-01 - Granted: 2016-12-13 - Earliest claimed: 2011-06-09 - Assignees: Robert Bosch GmbH; Samsung SDI Co., Ltd. - Applicants: Holger Fink - Inventors: Holger Fink - Web page: https://patentgrep.com/patent/US9520621B2 ## CPC - B60L 58/10: for monitoring or controlling batteries - B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors} - G01R 31/385: Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H01M 10/443: {in response to temperature} - H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) - H01M 10/486: {for measuring temperature} - H01M 50/574: Devices or arrangements for the interruption of current - H01M 50/581: in response to temperature - G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables - 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 - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - 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 The disclosure relates to a method for detecting a triggering of a security device. The security device is associated with a battery cell and is triggered if a security-critical situation is present in the battery cell. Initially an actual time path of a parameter of the battery cell is detected. At the same time, an expected time path of the parameter is determined, in particular using a model. Then, the actual time path is compared to the expected time path of the parameter. Finally, based on the comparison, it is determined whether to trigger the security device or not. ## Claims ### Claim 1 A method for identifying triggering of a safety device, wherein the safety device is associated with a battery cell and is triggered when there is a safety-critical situation in the battery cell, comprising: detecting an actual time profile of a voltage of the battery cell; determining an expected time profile of the voltage using a model; comparing the actual time profile of the voltage with the expected time profile of the voltage by comparing an actual change in the voltage over time with an expected change in the voltage over time; and making a decision, on the basis of the comparison, as to whether the safety device has been triggered, the decision being made that the safety device has been triggered when the actual change in the voltage over time deviates by more than a predefined amount from the expected change in the voltage over time. ### Claim 2 (depends on 1) The method as claimed in claim 1, further comprising: moving a battery system, which includes the battery cell, to a safe state when triggering of the safety device has been identified. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein: the safety device short-circuits the battery cell in the safety-critical situation, and the safety-critical situation includes at least one of (i) an elevated internal pressure in the battery cell and (ii) a mechanical deformation of the battery cell. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein: the safety device bridges the battery cell in the safety-critical situation, and the safety-critical situation includes an elevated internal pressure in the battery cell. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the expected change in the voltage of the battery cell over time is determined using a battery module configured to take into consideration at least one of (i) a battery current which flows through the battery cell and (ii) a temperature of the battery cell. ### Claim 6 (depends on 5) The method as claimed in claim 5, wherein: the battery module is configured as an observer system, and the actual time profile of the voltage is supplied to the battery model. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein a battery management unit is configured to execute the method. ### Claim 8 A battery comprising: at least one battery cell; at least one safety device which is associated with the at least one battery cell and is configured to be triggered when there is a safety-critical situation in the at least one battery cell; and a battery management unit configured to identify the triggering of the at least one safety device by (i) detecting an actual time profile of a voltage of the at least one battery cell, (ii) determining an expected time profile of the voltage using a model, (iii) comparing the actual time profile of the voltage with the expected time profile of the voltage by comparing an actual change in the voltage over time with an expected change in the voltage over time, and (iv) making a decision, on the basis of the comparison, as to whether the at least one safety device has been triggered, the decision being made that the safety device has been triggered when the actual change in the voltage over time deviates considerably from the expected change in the voltage over time. ### Claim 9 An electric motor vehicle, comprising: a battery including at least one battery cell, at least one safety device, and a battery management unit, the at least one safety device is associated with the at least one battery cell and is configured to be triggered when there is a safety-critical situation in the at least one battery cell, the battery management unit is configured to identify the triggering of the at least one safety device by (i) detecting an actual time profile of a voltage of the at least one battery cell, (ii) determining an expected time profile of the voltage using a model, (iii) comparing the actual time profile of the voltage with the expected time profile of the voltage by comparing an actual change in a voltage over time with an expected change in the voltage over time, and (iv) making a decision, on the basis of the comparison, as to whether the at least one safety device has been triggered, the decision being made that the safety device has been triggered when the actual change in the voltage over time deviates considerably from the expected change in the voltage over time.