一种单体电池SOH计量系统及方法
By collecting big data and conducting segmented EIS tests, combined with fitting functions, an accurate SOH measurement method was established, which solved the problem of insufficient accuracy in SOH estimation under the aging state of individual cells and achieved high-precision SOH estimation under unsteady-state conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUNAN INST OF METROLOGY & TEST
- Filing Date
- 2023-06-27
- Publication Date
- 2026-07-17
AI Technical Summary
The current technology for estimating the state of aging (SOH) of a single cell is not accurate enough, especially in online estimation and adaptive environments.
By employing big data acquisition and segmented EIS testing, and by fitting functions L, M, and N, combined with the battery's ohmic resistance Rs, charge transfer resistance Rct, and diffusion transfer resistance Rcl, an accurate SOH measurement method is established. Capacity testing and EIS testing are performed alternately during the charging and discharging process to eliminate the interference of battery capacity differences on the test results.
It improves the accuracy of SOH estimation, enables real-time testing under non-steady-state conditions, reduces the impact of open-circuit voltage on EIS testing, and enhances the accuracy of online estimation.
Smart Images
Figure CN116736168B_ABST