Monitoring and control of electrochemical cell degradation via strain based battery testing
AssigneeSouthwest Research Institute
InventorsJoe Steiber, Jeff Qiang Xu
Life of this patent
Estimating the term…
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.
Claims13
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.
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%.
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.
Dependencies are inferred from the claim text.