# US 2019/0379092 A1 · Method and system for validating a temperature sensor in a battery cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379092 A1 - Document ID: US20190379092A1 - Status: Published application - Kind: A1 - Application number: 16/432,178 - Filed: 2019-06-05 - Published: 2019-12-12 - Earliest claimed: 2018-06-07 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Adrian Schiffer; Peter Parz - Web page: https://patentgrep.com/patent/US20190379092A1 ## CPC - G01R 31/3835: involving only voltage measurements - H01M 10/4207: {for several batteries or cells simultaneously or sequentially} - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/486: {for measuring temperature} - G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables - G01R 31/389: Measuring internal impedance, internal conductance or related variables - H01M 2200/10: Temperature sensitive devices - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A method and a system for validating a temperature sensor integrated into a battery system are disclosed. In one aspect, the method includes determining an internal resistance of at least one battery cell in thermal contact with the temperature sensor and determining a state of charge (SOC) of the at least one battery cell. The method also includes determining at least one reference temperature from a lookup table (LUT) or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell. The method further includes comparing the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween. The method additionally includes validating the temperature sensor based on whether the difference exceeds a preconfigured threshold. ## Claims ### Claim 1 A method for validating a temperature sensor integrated into a battery system, comprising: determining an internal resistance of at least one battery cell in thermal contact with the temperature sensor; determining a state of charge (SOC) of the at least one battery cell; determining at least one reference temperature from a lookup table (LUT) or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell; comparing the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween; and validating the temperature sensor based on whether the difference exceeds a preconfigured threshold. ### Claim 2 (depends on 1) The method of claim 1, wherein the validating comprises: determining that the temperature sensor functions properly when the difference does not exceed the preconfigured threshold; and determining that the temperature sensor functions improperly when the difference exceeds the preconfigured threshold. ### Claim 3 (depends on 1) The method of claim 1, wherein the determination of the internal resistance and SOC of the at least one battery cell and the at least one temperature measurement of the temperature sensor are performed during a preconfigured period of time. ### Claim 4 (depends on 1) The method of claim 1, wherein the internal resistance of the at least one battery cell is determined based on a measurement of a voltage drop during a discharge pulse. ### Claim 5 (depends on 4) The method of claim 4, wherein the voltage drop is measured with respect to an actual terminal voltage of the at least one battery cell and in response to a specific load or balancing current drawn from the at least one battery cell and/or a specific charging or balancing current provided to the at least one battery cell. ### Claim 6 (depends on 1) The method of claim 1, wherein the internal resistance of the at least one battery cell is determined by measuring a voltage transient in response to cutting a specific load from the at least one battery cell. ### Claim 7 (depends on 1) The method of claim 1, wherein the SOC of the at least one battery cell is determined based on measuring an actual terminal voltage of the at least one battery cell. ### Claim 8 (depends on 7) The method of claim 7, wherein a reference SOC value is determined based on the measured actual terminal voltage and an SOC-LUT. ### Claim 9 (depends on 1) The method of claim 1, wherein the reference battery cell is of the same type as the at least one battery cell. ### Claim 10 (depends on 1) The method of claim 1, wherein the LUT is based on a plurality of reference measurements of an internal resistance of the reference cell for a plurality of different SOC values and a plurality of different temperatures. ### Claim 11 (depends on 10) The method of claim 10, wherein the LUT is based on an equivalent circuit model providing a parameterized function of the battery cell's internal resistance in dependence of its SOC and its temperature. ### Claim 12 (depends on 11) The method of claim 11, wherein parameters of the equivalent circuit model or the parameterized function are determined by fitting the model or the parameterized function to the plurality of reference measurements. ### Claim 13 A method for validating a temperature sensor integrated into a battery system, comprising: determining an internal resistance of at least one battery cell in thermal contact with the temperature sensor; determining a state of charge (SOC) of the at least one battery cell; determining at least one reference temperature from a memory or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell; and comparing the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween. ### Claim 14 (depends on 13) The method of claim 13, further comprising: validating the temperature sensor based on whether the difference exceeds a preconfigured threshold. ### Claim 15 (depends on 14) The method of claim 14, wherein the validating comprises: determining that the temperature sensor functions properly when the difference does not exceed the preconfigured threshold; and determining that the temperature sensor functions improperly when the difference exceeds the preconfigured threshold. ### Claim 16 (depends on 14) The method of claim 14, wherein the validating comprises: determining that the temperature sensor functions properly when the difference exceeds the preconfigured threshold; and determining that the temperature sensor functions improperly when the difference does not exceed the preconfigured threshold. ### Claim 17 A battery system, comprising: at least one battery cell; at least one temperature sensor in thermal contact with and configured to sense temperature of the at least one battery cell; at least one voltage sensor configured to measure a terminal voltage of the at least one battery cell; and a controller configured to i) determine an internal resistance of the at least one battery cell, ii) determine a state of charge (SOC) of the at least one battery cell, iii) determine at least one reference temperature from a lookup table (LUT) or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell, iv) compare the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween and v) validate the temperature sensor based on whether the difference exceeds a preconfigured threshold. ### Claim 18 (depends on 17) The battery system of claim 17, wherein the controller is further configured to: determine that the temperature sensor functions properly when the difference does not exceed the preconfigured threshold; and determine that the temperature sensor functions improperly when the difference exceeds the preconfigured threshold. ### Claim 19 (depends on 17) The battery system of claim 17, further comprising: at least one current sensor configured to measure a load, balancing and/or charging current of the battery cell, wherein the controller comprises at least one cell supervision circuit (CSC) configured to receive measurement values of the temperature, voltage and current sensors. ### Claim 20 (depends on 19) The battery system of claim 19, wherein the controller further comprises a battery management system (BMS) connected to the at least one CSC, and being configured to: receive voltage, current, and temperature values from the at least one CSC; determine SOC and internal resistance of the at least one battery cell; and determine the at least one reference temperature, and compare it to the at least one temperature value received from the at least one CSC.