Low-voltage control device of power battery and electric automobile

Abstract

The invention discloses a low-voltage control device of a power battery and an electric automobile. The low-voltage control device comprises a battery module, a control module and a change-over switch, and the battery module and the change-over switch are connected with the control module; the battery module is formed by connecting a plurality of battery packs in parallel; wherein each battery pack is formed by connecting a plurality of single battery cells in series; the control module controls the change-over switch to carry out switching according to a target voltage and a single voltage of the single battery cell; the change-over switch is used for switching the number of the single battery cells connected in series in the battery module, so that the battery module outputs target voltage, and the direct-current voltage converter outputs the target voltage to each low-voltage controller. A 12v low-voltage power supply loop is stripped from the high-voltage power battery, so that the problem that the whole vehicle lies down due to power shortage of the low-voltage storage battery can be avoided, and the user experience is improved.

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