Impedance detection device of battery

An impedance detection device for a battery, the device comprising: a first processing module (501) for performing first code conversion on a first signal according to a preset code to obtain an excitation signal and applying the excitation signal to the battery, the first signal being an original signal for generating the excitation signal; a sampler (502) coupled to the battery for sampling a voltage of the battery after applying the excitation signal to the battery to obtain a sampled voltage signal; the second processing module (503) is used for performing second code conversion on the sampling voltage signal according to a preset code so as to obtain a first voltage signal; performing second code conversion on the current signal of the battery according to a preset code to obtain a first current signal; and determining impedance corresponding to the battery according to the first voltage signal and the first current signal. By adopting the method, EIS detection can be realized when the battery is in a charging state or the battery is in a load discharging state.