Pole piece, battery cell and battery

The utility model discloses a pole piece, cell and battery, the pole piece includes: first potential detection subassembly, current collector and stack up multilayer coating on the current collector, the part in first potential detection subassembly is clamped between adjacent coating, can detect the voltage between first potential detection subassembly and current collector, the quantity of the electrolyte immersed into the pole piece is analyzed through the change of the voltage, so that the infiltration degree of the electrolyte in the pole piece and the consumption degree of the electrolyte are determined, measures are taken in time when the pole piece is lack of electrolyte, the influence on the use of the battery is avoided, and the safety of the battery is improved. 本实用新型公开了一种极片、电芯及电池，极片包括：第一电位检测组件、集流体、以及叠层设置于集流体之上的多层涂层，第一电位检测组件中的部分被夹在相邻涂层之间，这样可以检测出第一电位检测组件与集流体之间的电压，通过电压的变化分析出浸入至极片中的电解液的量，从而确定出电解液在极片中的浸润程度和电解液的消耗程度，在极片内出现缺液时及时采取措施，避免影响电池的使用，提高电池的安全性。