An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve
The inevitable decline in battery performance presents a major barrier to its widespread industrial application. Adaptive and accurate estimation of battery capacity is paramount for battery operation, maintenance, and residual value evaluation. In this paper, we propose a novel battery capacity est...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
|
| Series: | Batteries |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2313-0105/11/7/265 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1839616499902316544 |
|---|---|
| author | Linjing Zhang Xiaoqian Su Caiping Zhang Yubin Wang Yao Wang Tao Zhu Xinyuan Fan |
| author_facet | Linjing Zhang Xiaoqian Su Caiping Zhang Yubin Wang Yao Wang Tao Zhu Xinyuan Fan |
| author_sort | Linjing Zhang |
| collection | DOAJ |
| description | The inevitable decline in battery performance presents a major barrier to its widespread industrial application. Adaptive and accurate estimation of battery capacity is paramount for battery operation, maintenance, and residual value evaluation. In this paper, we propose a novel battery capacity estimation method based on an approximate open circuit voltage curve. The proposed method is rigorously tested using both lithium–iron–phosphate (LFP) and nickel–cobalt–manganese (NCM) battery packs at multiple charging rates under varied aging conditions. To further enhance capacity estimation accuracy, a voltage correction strategy is implemented utilizing the incremental capacity (IC) curve. This strategy also verifies the potential benefits of increasing the charging rate to shorten the overall test duration. Eventually, the capacity estimation error is consistently controlled within 2%. With optimal state of charge (SOC) interval selection, the estimation error can be further reduced to 1%. Clearly, our proposed method exhibits excellent compatibility across diverse battery materials and degradation states. This adaptability holds substantial scientific value and practical importance. It contributes to the safe and economic utilization of Li-ion batteries throughout their entire lifespan. |
| format | Article |
| id | doaj-art-a9c79a71e6f1458e8af1ace9f7953bb7 |
| institution | Matheson Library |
| issn | 2313-0105 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Batteries |
| spelling | doaj-art-a9c79a71e6f1458e8af1ace9f7953bb72025-07-25T13:14:03ZengMDPI AGBatteries2313-01052025-07-0111726510.3390/batteries11070265An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage CurveLinjing Zhang0Xiaoqian Su1Caiping Zhang2Yubin Wang3Yao Wang4Tao Zhu5Xinyuan Fan6National Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaNational Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing 100044, ChinaThe inevitable decline in battery performance presents a major barrier to its widespread industrial application. Adaptive and accurate estimation of battery capacity is paramount for battery operation, maintenance, and residual value evaluation. In this paper, we propose a novel battery capacity estimation method based on an approximate open circuit voltage curve. The proposed method is rigorously tested using both lithium–iron–phosphate (LFP) and nickel–cobalt–manganese (NCM) battery packs at multiple charging rates under varied aging conditions. To further enhance capacity estimation accuracy, a voltage correction strategy is implemented utilizing the incremental capacity (IC) curve. This strategy also verifies the potential benefits of increasing the charging rate to shorten the overall test duration. Eventually, the capacity estimation error is consistently controlled within 2%. With optimal state of charge (SOC) interval selection, the estimation error can be further reduced to 1%. Clearly, our proposed method exhibits excellent compatibility across diverse battery materials and degradation states. This adaptability holds substantial scientific value and practical importance. It contributes to the safe and economic utilization of Li-ion batteries throughout their entire lifespan.https://www.mdpi.com/2313-0105/11/7/265lithium-ion batterycapacity estimationopen circuit voltage curvelithium–iron–phosphate batterynickel–cobalt–manganese batteryresidual value evaluation |
| spellingShingle | Linjing Zhang Xiaoqian Su Caiping Zhang Yubin Wang Yao Wang Tao Zhu Xinyuan Fan An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve Batteries lithium-ion battery capacity estimation open circuit voltage curve lithium–iron–phosphate battery nickel–cobalt–manganese battery residual value evaluation |
| title | An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve |
| title_full | An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve |
| title_fullStr | An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve |
| title_full_unstemmed | An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve |
| title_short | An Adaptable Capacity Estimation Method for Lithium-Ion Batteries Based on a Constructed Open Circuit Voltage Curve |
| title_sort | adaptable capacity estimation method for lithium ion batteries based on a constructed open circuit voltage curve |
| topic | lithium-ion battery capacity estimation open circuit voltage curve lithium–iron–phosphate battery nickel–cobalt–manganese battery residual value evaluation |
| url | https://www.mdpi.com/2313-0105/11/7/265 |
| work_keys_str_mv | AT linjingzhang anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT xiaoqiansu anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT caipingzhang anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT yubinwang anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT yaowang anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT taozhu anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT xinyuanfan anadaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT linjingzhang adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT xiaoqiansu adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT caipingzhang adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT yubinwang adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT yaowang adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT taozhu adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve AT xinyuanfan adaptablecapacityestimationmethodforlithiumionbatteriesbasedonaconstructedopencircuitvoltagecurve |