钛酸锂电池应用于电网储能调频、调峰场景时，以恒功率充放电进行调度，实验室及生产检验通常使用恒流充放电，两类工况下电池容量、能量、效率存在明显差异，现有研究缺少温度、倍率、电压区间多因素下钛酸锂电池实测量化数据，无法支撑BMS 补偿算法与检测换算。本文在不同温度、充放电倍率及工作电压区间条件下，对比研究恒流（CC）与恒功率（CP）模式对 40 Ah 钛酸锂电池容量、能量及能量效率的作用机制。结果表明：100% 放电深度下，两种模式对充电容量与能量的影响不显著，偏差在0.7%以内。受极化特性差异影响，恒功率放电的容量、能量及能量效率均低于恒流模式；温度越低、倍率越大、电压区间越窄，两种模式的性能差异越显著。100%DOD区间，-20℃下，1P恒功率放电容量相对于1C恒流衰减2.3%、放电能量衰减2.2%；25℃下，5P恒功率放电容量相对于5C恒流衰减0.9%、放电能量衰减1.4%；4P恒功率及2.4 V～2.0 V 窄电压区间耦合时衰减最大，恒功率放电容量相对恒流衰减 17.2%、放电能量衰减 17.6%。本文结果可为钛酸锂电池在储能系统中的工况匹配与性能评估提供数据支持。

When lithium titanate batteries are used for frequency regulation and peak shaving in grid energy storage， they operate under constant power (CP) charge-discharge dispatching， whereas constant current (CC) charge-discharge is widely adopted for laboratory testing and factory testing. Significant discrepancies in battery capacity， energy output and energy efficiency exist between the two operating modes. Current research lacks measured quantitative data of lithium titanate batteries under the multi-factor coupling of temperature， charge-discharge rate and operating voltage window， which restricts the development of BMS compensation algorithms and the conversion of test indicators. In this work， comparative experiments are conducted under various temperatures， charge-discharge rates and operating voltage ranges to explore the mechanism of constant current (CC) and constant power (CP) modes on the capacity， energy and energy efficiency of 40 Ah lithium titanate batteries. The results reveal that under 100% depth of discharge (DOD)， the two modes exert negligible influence on charging capacity and charging energy with deviations less than 0.7%. Due to distinct polarization characteristics， the discharge capacity， discharge energy and energy efficiency of CP mode are inferior to those of CC mode. The performance gap between the two modes becomes more prominent at lower temperatures， higher charge-discharge rates and narrower voltage windows. At 100% DOD and -20 ℃， the discharge capacity and energy of 1 P CP mode decrease by 2.3% and 2.2% compared with 1 C CC mode. At 25 ℃， the discharge capacity and energy of 5 P CP mode drop by 0.9% and 1.4% relative to 5 C CC mode. The maximum attenuation appears under the coupled condition of 4 P CP and the narrow voltage window of 2.4 V to 2.0 V， where the discharge capacity and discharge energy of CP mode are reduced by 17.2% and 17.6% compared with CC mode. The findings of this paper can provide data support for operating condition matching and performance evaluation of lithium titanate batteries in energy storage systems.