NMC, NCA, and LFP Cells Degradation Under Randomized Current Profiles

A set of three types of Li-ion cells (NMC, NCA, and LFP) were run through different operational profiles at room temperature. Charging was carried out in a constant current (CC) mode at cell's nominal charging current until the cell voltage reached the cut-off voltage, and then continued in a constant voltage (CV) mode until the charge current dropped to cut-off current. After charging, cells were discharged to cut-off voltage using a randomized sequence of discharging loads. Discharging periods last 1 minutes each, while a new discharging setpoint is selected. Additionally, every 200 cycles, the RW loads were updated. Every 20 of RW cycles, Periodic Hybrid Dynamic Pulse Power Characterization (HPPC) and Constant Current (CC) discharging profiles were executed as reference performance testing (RPT) to monitor transient dynamics and overall performance changes.

You will find a struct with the following fields.
Files:
> NCA
-OCV
-NCA_CELL_1
-NCA_CELL_2
-NCA_CELL_3
-NCA_CELL_4
> NMC
-OCV
-NMC_CELL_1
-NMC_CELL_2
> LFP
-OCV
-LFP_CELL_1
-LFP_CELL_2
> Ambient Temp

> 1. **Cycle** (number of the current cycle)
> 2. **Time** (date and time at which the current cycle was started in dd-Mon-yyyy HH:MM:SS format)
> 3. **Voltage** (vector of sample voltage in units of Volts)
> 4. **Current** (vector of current in units of Amps)
> 5. **Temperature** (vector of sample temperature in units of degrees C)
> 6. **Comment** (Type of the current cycle )

本数据集涵盖三类锂离子电池（Li-ion cells），于室温环境下按照不同运行工况开展循环测试。充电流程采用恒流（constant current, CC）模式，以电池标称充电电流进行充电，直至单体电压达到截止电压（cut-off voltage），随后切换至恒压（constant voltage, CV）模式，直至充电电流降至截止电流（cut-off current）。充电完成后，采用随机选取的放电负载序列将电池放电至截止电压。单次放电时长为1分钟，随后切换至新的放电设定值。此外，每完成200个循环，便更新随机负载（RW）的参数。每完成20个随机负载循环，将执行周期性混合动态脉冲功率特性测试（Periodic Hybrid Dynamic Pulse Power Characterization, HPPC）与恒流（CC）放电工况，作为参考性能测试（reference performance testing, RPT），用于监测电池的瞬态动力学特性与整体性能变化。

文件：
> NCA
> - 开路电压（Open Circuit Voltage, OCV）
> - NCA_CELL_1
> - NCA_CELL_2
> - NCA_CELL_3
> - NCA_CELL_4
> NMC
> - 开路电压（Open Circuit Voltage, OCV）
> - NMC_CELL_1
> - NMC_CELL_2
> LFP
> - 开路电压（Open Circuit Voltage, OCV）
> - LFP_CELL_1
> - LFP_CELL_2
> 环境温度（Ambient Temp）

数据集包含以下数据字段：
1. **Cycle**：当前循环的编号
2. **Time**：当前循环启动的日期与时间，格式为dd-Mon-yyyy HH:MM:SS
3. **Voltage**：采样电压向量，单位为伏特（V）
4. **Current**：采样电流向量，单位为安培（A）
5. **Temperature**：采样温度向量，单位为摄氏度（℃）
6. **Comment**：当前循环的类型

搜集汇总

背景与挑战

背景概述

该数据集记录了NMC、NCA和LFP三种锂离子电池在随机电流负载下的退化情况，包含详细的充放电循环数据和性能测试结果，适用于电池老化研究。