Voltage prediction method and device of lithium ion battery

The invention relates to the technical field of batteries, in particular to a voltage prediction method and device for a lithium ion battery, and the method comprises the following steps: collecting the actual voltage of the lithium ion battery every first preset time; establishing a time difference-voltage ratio relational expression according to the actual voltages acquired from the first time to the nth time and the acquisition moments; and predicting the predicted voltage of one or more lithium ion batteries to be measured based on the time difference-voltage ratio relational expression. According to the method, the batteries with poor self-discharge can be quickly and accurately screened out, the production efficiency is improved, the battery cost is reduced, the consistency of the voltage of the offline batteries is improved, the safety performance of the batteries is further improved, and the occurrence of thermal runaway accidents caused by poor self-discharge is reduced. 本发明涉及电池技术领域，特别涉及一种锂离子电池的电压预测方