# US 11,909,009 B2 · Battery safety test device and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,009 B2 - Document ID: US11909009B2 - Status: Granted - Kind: B2 - Application number: 17/420,161 - Filed: 2020-03-17 - Published: 2022-03-24 - Granted: 2024-02-20 - Earliest claimed: 2019-03-19 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Won Hyeok Lee; Hyung Jin Hwang; Seong Ha Cha; Ui Yong Jeong; In Cheol Shin - Web page: https://patentgrep.com/patent/US11909009B2 ## CPC - H01M 10/4285: {Testing apparatus} - G01R 31/3648: {comprising digital calculation means, e.g. for performing an algorithm} - G01R 31/3842: combining voltage and current measurements - G01R 31/385: Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) - G01R 31/386: {using test-loads} - 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) - H02J 7/60: including safety or protection arrangements - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention provides a battery safety test device includes: a mechanical switch element having one end connected to either a battery positive or negative electrode and the other end connected to an electronic switching element; the electronic switching element having one end connected to the mechanical switch element and the other end connected to the other of the battery positive or negative electrode; a voltage sensor for measuring a voltage of the battery after the mechanical switch element and the electronic switching element are turned on; and a current sensor for measuring a current of the battery after the mechanical switch element and the electronic switching element are turned on. ## Claims ### Claim 1 A battery safety test device, comprising: an electronic switching element; a mechanical switch element having a first end connected to either a battery positive electrode or a battery negative electrode and a second end connected to the electronic switching element, wherein the electronic switching element has a first end connected to the mechanical switch element and a second end connected to the other of the battery positive electrode or the battery negative electrode; a voltage sensor configured to measure a voltage of the battery after the mechanical switch element and the electronic switching element are turned on; and a current sensor configured to measure a current of the battery after the mechanical switch element and the electronic switching element are turned on; a waveform calculator configured to calculate a voltage and current waveform of the battery using values measured by the voltage sensor and the current sensor after the mechanical switch element and the electronic switch element are turned on; a reader configured to determine a safety of the battery using the voltage and current waveforms calculated by the waveform calculator; and a variable resistor connected directed to either the battery positive electrode or the battery negative electrode and connected directly between the battery and the electronic switching element. ### Claim 2 (depends on 1) The device of claim 1, wherein the electronic switch element is configured to turned on after the mechanical switch element is turned on. ### Claim 3 (depends on 1) The device of claim 1, further comprising: a DC power source configured to drive the mechanical switch element; and a second switch connected between the DC power source and the mechanical switch element, wherein the mechanical switch element is a magnetic relay. ### Claim 4 (depends on 1) The device of claim 1, further comprising a gate circuit configured to drive the electronic switch element, wherein the electronic switch element is any one of a thyristor, MOSFET or IGBT. ### Claim 5 (depends on 1) The device of claim 1, wherein the current sensor is a Current Transfer (CT) sensor. ### Claim 6 A battery safety test method performed by a battery safety test device, the battery safety test device including: an electronic switching element; a mechanical switch element having a first end connected to either a battery positive electrode or a battery negative electrode and a second end connected to the electronic switching element, wherein the electronic switching element has a first end connected to the mechanical switch element and a second end connected to the other of the battery positive electrode or the battery negative electrode; a voltage sensor; a current sensor; and a variable resistor connected directed to either the battery positive electrode or the battery negative electrode and connected directly between the battery and the electronic switching element, the method comprising: applying power to the mechanical switch element to turn on the mechanical switch element; turning on the electronic switch element after the mechanical switch element is turned on; measuring a voltage of the battery, by the voltage sensor, and measuring a current across the battery, by the current sensor, after the mechanical switch element and the electronic switch element are turned on; calculating a voltage and current waveform of the battery using the measured voltage and current at both the battery positive electrode and the battery negative electrode; and determining a safety of the battery using the calculated voltage and current waveforms of the battery. ### Claim 7 (depends on 6) The method of claim 6, wherein the mechanical switch element is a magnetic relay. ### Claim 8 (depends on 6) The method of claim 6, wherein the electronic switch element is any one of a thyristor, MOSFET or IGBT. ### Claim 9 (depends on 6) The method of claim 6, wherein the battery safety test device further comprises: a DC power source configured to drive the mechanical switch element; and a second switch connected between the DC power source and the mechanical switch element, wherein the mechanical switch element is a magnetic relay.