Single-point diagnosis for detecting the critical health state of lithium-ion batteries
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The dataset used in our study, “Single-point diagnosis for detecting the critical health state of lithium-ion batteries ”, consists of 60 commercial lithium-ion batteries cycled under various operating conditions. These high-power NCA/Gr-Si cylindrical cells, manufactured by Samsung SDI (INR 18650-30Q), were cycled using vertical cylindrical fixtures on a battery cycler (CRC 05-10, Wonik PNE, South Korea) in a temperature-controlled chamber. The cells have a nominal capacity of 3 Ah and a nominal voltage of 3.6V. The voltage-cutoffs (2.5 V and 4.2 V, corresponding to 0%−100% SOC) adopted in this work were based on the manufacturer’s manual. 1st cycle aging test (SOH100→SOH80) under various operating conditions The cells were cycled under nine different operating conditions. The operating conditions were differentiated based on chamber temperature, (dis)charging cut-off voltages, and charging rates, while the discharge was identically conducted at 1C constant current (CC). The chambers were set to four different temperatures: 10 °C, 25 °C, 45 °C, and 60 °C. Within each temperature, the tests were further subdivided based on charging C-rate into low C-rate (0.5C and 1C) and high C-rate (3C) conditions. For 45 °C and 60 °C conditions, further subdivisions with regard to charging rate were not conducted. At every 50 to 100 cycles, including BOL and EOL, every cell was subjected to the reference performance test (RPT) to measure SOH and kinetic properties (1C capacity and DCIR). The cycles lasted until the SOH reached SOH80. Especially, additional 1/30C (dis)charging cycles were conducted at EOL. Second cycle life test (SOH80→SOH60) after the EOL all the 60 cells were subjected to an additional cycling test with an identical cycling protocol (0.5C CC with CV of 0.25C cut-off for charge and 0.5C CC for discharge, 2.5 V−4.2 V) at 25°C, and the capacity of 0.2C−0.2C cycle was checked every 50 cycles. The cycles lasted until the SOH reached SOH60.
本研究使用的数据集《用于检测锂离子电池关键健康状态的单点诊断》包含60只在不同运行工况下完成循环测试的商用锂离子电池。该批电芯为三星SDI（Samsung SDI）制造的高功率NCA/Gr-Si圆柱电芯，型号为INR 18650-30Q，采用韩国Wonik PNE公司的CRC 05-10电池测试仪搭配立式圆柱夹具，在温控环境箱内完成循环测试。电芯标称容量为3 Ah，标称电压为3.6 V。本研究采用的电压截止值为2.5 V与4.2 V（对应0%−100%荷电状态（State of Charge, SOC）），该参数参考自厂商官方手册。 第一阶段老化测试（初始健康状态SOH100衰减至SOH80） 电芯在9种不同运行工况下完成循环测试，工况差异维度涵盖温控箱温度、充放电截止电压以及充电倍率，而放电环节统一采用1C恒流（Constant Current, CC）模式。温控箱设置了4组测试温度：10 ℃、25 ℃、45 ℃与60 ℃。在每组温度工况下，测试进一步按充电倍率划分为低倍率（0.5C、1C）与高倍率（3C）子工况；但针对45 ℃与60 ℃的工况，未开展充电倍率细分。 在每50至100次循环节点（含循环起始点BOL与循环终止点EOL），需对每只电芯执行参考性能测试（Reference Performance Test, RPT），以测量其健康状态（State of Health, SOH）与动力学特性（1C容量与直流内阻（Direct Current Internal Resistance, DCIR））。测试循环持续至电芯SOH降至80%。特别地，在循环终止点EOL处，额外开展了1/30C倍率的充放电循环测试。 第二阶段循环寿命测试（从SOH80衰减至SOH60） 全部60只电芯在完成第一阶段测试至EOL后，均在25 ℃环境下执行额外循环测试，循环协议统一为：充电采用0.5C恒流+恒压（Constant Voltage, CV）模式，恒压阶段截止电流为0.25C；放电采用0.5C恒流模式，电压区间为2.5 V−4.2 V。每50次循环检测一次0.2C−0.2C循环的容量，测试持续至电芯SOH降至60%。
