# US 10,120,035 B2 · Monitoring and control of electrochemical cell degradation via strain based battery testing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,035 B2 - Document ID: US10120035B2 - Status: Granted - Kind: B2 - Application number: 14/956,011 - Filed: 2015-12-01 - Published: 2017-06-01 - Granted: 2018-11-06 - Earliest claimed: 2015-12-01 - Assignees: Southwest Research Institute - Applicants: Southwest Research Institute - Inventors: Joe Steiber; Jeff Qiang Xu - Web page: https://patentgrep.com/patent/US10120035B2 ## CPC - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - G01R 31/3648: {comprising digital calculation means, e.g. for performing an algorithm} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A method and system for the monitoring and control of electrochemical cell degradation by use of strain-based battery testing. Strain-based battery is employed to recognize and implement a battery revival cycle to reduce battery degradation rates. ## Claims ### Claim 1 A computer-implemented method for monitoring and control of electrochemical cell degradation and state of health (SOH) of a battery comprising: applying a strain gauge to said battery; measuring a first strain of said battery (S1) using said strain gauge at an initial state of said battery ε; exposing said battery to charge/discharge cycling; measuring a second strain ε of said battery (S2) after said charge/discharge cycling, using said strain gauge, wherein said second strain is equal to εo+Δε, where Δε is the measured change in strain; determining, by a controller, said measured change in strain Δε based on said measured first (S1) strain and said measured second strain (S2) of said battery, wherein said measured change in strain Δε is a function of battery voltage and the rate of change of said battery SOH varies with respect to strain; determining, by the controller, a change in the SOH of said battery after said charge/discharge cycling; and subsequent to determining the change in the SOH of said battery after said charge/discharge cycling, exposing said battery to a revival cycle comprising thermal treatment based on the SOH of said battery. ### Claim 2 (depends on 1) The method of claim 1, wherein said strain gauge is applied with direct physical contact to said battery. ### Claim 3 (depends on 1) The method of claim 1, wherein said strain gauge is applied to a strap, said strap configured to secure one or more battery cells of said battery. ### Claim 4 (depends on 1) The method of claim 1, wherein said strain gauge is applied to said battery along a selected dimension comprising at least one of a length, width or height of said battery, said selected dimension based on a response of said battery to a change from said initial state to said aged state. ### Claim 5 (depends on 1) The method of claim 1, wherein said strain gauge is applied to said battery along a selected dimension comprising any combination of length, width and height of said battery, said selected dimension based on a response of said battery to a change from said initial state to said aged state. ### Claim 6 (depends on 1) The method of claim 1, wherein said strain gauge is applied to said battery along a selected dimension to measure a change in volume of said battery. ### Claim 7 (depends on 1) The method of claim 1 wherein said thermal treatment comprises heating said battery at a temperature of less than or equal to 55° C. ### Claim 8 A computer-implemented method for monitoring and control of electrochemical cell degradation and state of health (SOH) of a battery comprising: applying a strain gauge to said battery; measuring a first strain of said battery (S1) using said strain gauge at an initial state of said battery εo; exposing said battery to charge/discharge cycling; measuring a second strain ε of said battery (S2) after said charge/discharge cycling, using said strain gauge, wherein said second strain is equal to εo+Δε, where Δε is the measured change in strain; determining, by a controller, said measured change in strain based on said measured first (S1) strain and said measured second strain (S2) of said battery, wherein said measured change in strain Δε is a function of battery voltage and the rate of change of said battery SOH varies with respect to strain; determining, by the controller, a change in the SOH of said battery after said charge/discharge cycling; and exposing said battery to a revival cycle comprising thermal treatment wherein said battery SOH is determined to be less than or equal to 2.0%. ### Claim 9 (depends on 8) The method of claim 8 wherein said charge/discharge cycling comprising a plurality of cycles. ### Claim 10 (depends on 9) The method of claim 9, wherein said plurality of charge/discharge cycles comprises up to 200 cycles. ### Claim 11 (depends on 8) The method of claim 8 wherein subsequent to said battery revival cycle said battery SOH is determined to be less than or equal to 1.0%. ### Claim 12 A computer-readable medium having stored thereon a plurality of non-transitory instructions that when executed by a controller result in the following operations for monitoring and control of electrochemical cell degradation and state of health (SOH) of a battery, wherein said battery includes a strain gauge: causing to be measured a first strain of said battery (S1) using said strain gauge at an initial state of said battery εo; causing to be exposed said battery to charge/discharge cycling; causing to be measured a second strain ε of said battery (S2) after said charge/discharge cycling, using said strain gauge, wherein said second strain is equal to εo+Δε, where Δε is the measured change in strain; determining, by a controller, said measured change in strain Δε based on said measured first (S1) strain and said measured second strain (S2) of said battery, wherein said measured change in strain Δε is a function of battery voltage and the rate of change of said battery SOH varies with respect to strain; determining a change in the SOH of said battery after said charge/discharge cycling; and exposing said battery to a revival cycle comprising thermal treatment wherein said battery SOH is determined to be less than or equal to a predetermined value. ### Claim 13 (depends on 12) The computer-readable medium of claim 12, wherein said predetermined value is 2.0%.