Intelligent battery, including a plurality of battery cell, an arbitrary battery cell includes upper cover of the battery, last change over switch, the communication interface of being provided with of upper cover of the battery, a plurality of battery cell pass through communication interface carries out cascade connection, constitutes storage battery. The inside NULL that contains of an arbitrary battery cell, NULL is used for the online real -time supervision of battery cell voltage, internal resistance, temperature, NULL includes: AD chip, CPU treater, voltage measurement circuit, internalresistance measuring circuit, temperature measuring circuit, AD chip connection CPU treater, communication interface is connected to the CPU treater. The utility model discloses the built -in NULL who supports internal resistance measurement, voltage measurement, temperature measurement of intelligent battery supports the design of customization built -in sensor, can reflect battery self operating condition in real time, can carry out the voltage equilibrium, high cohesion, low coupling. The outward appearance is succinct, the simple installation, and the security is high, and it is convenient to maintain, can realize the remote maintenance operation comprehensively.