用于获取锂离子电池正负极开路电势曲线的纽扣电池试验需要对电池进行破坏性拆解，而且试验过程中电池极易受到污染。为解决此问题，提出了一种利用伪参比电极获取锂离子电池正负极相对开路电势曲线的方法。该方法将锂电池外壳作为参比电极，通过小倍率充放电试验直接测得电极与外壳之间的相对开路电势。通过商用钛酸锂电池对所提方法进行试验验证，结果表明利用所提方法计算得到的电池电压和实际测量的电池电压的均方根误差仅为4.2 mV，且在同批次电池上辨识得到的热力学参数随电池容量衰减而减小。试验结果验证了伪参比电极法可在不破坏电池的情况下获取到可信度较高的相对开路电势曲线。

A button cell test used to obtain the open-circuit potential (OCP) curves of lithium-ion battery electrodes requires destructive disassembly of the battery, and the battery is highly susceptible to contamination during the process. To address this issue, a method utilizing a pseudo-reference electrode to acquire the relative OCP curves of the electrodes of lithium-ion batteries was proposed. In this method, the lithium battery casing was used as a reference electrode, and the relative OCP between the electrode and the casing was directly measured through low-rate charge-discharge tests. The method was experimentally validated using commercial lithium titanate batteries, and the results showed that the root mean square error (RMSE) between the calculated and the actual measured battery voltages was only 4.2 mV. Moreover, the thermodynamic parameters identified from the same batch of batteries decreased as the battery capacity decayed. The experimental results confirm that the pseudo-reference electrode method can obtain reliable relative OCP curves without damaging the battery.