41results about How to "Reduce pre-charge time" patented technology

The invention provides a method and device for controlling high voltage on a multi-branch battery system and a storage medium, and relates to the technical field of new energy automobiles, and the method comprises the steps: obtaining the terminal voltage of a battery pack of each battery branch after a high voltage on instruction is received; identifying the current operation mode of the multi-branch battery system; dynamically sorting the terminal voltage of each battery pack based on a sorting mode matched with the operation mode; selecting an optimal pre-charging branch for pre-charging based on a sorting result; after the pre-charging is completed, obtaining the bus voltage of the bus capacitor side and the battery pack terminal voltage of each of the rest battery branches except the battery branch corresponding to the preferable pre-charging branch; and for each of the other battery branches except the battery branch corresponding to the preferable pre-charging branch, when the voltage difference between the battery pack terminal voltage and the bus voltage is smaller than a preset safety threshold value, directly closing the main positive relay of the battery branch. According to the method, the starting times of the pre-charging relay are reduced, and the high-voltage time is shortened while the system safety is ensured.

The application relates to the technical field of pre-charging circuits, and discloses a pre-charging circuit and a charging method, wherein the pre-charging circuit comprises a switching unit, a constant-current generating unit and a comparison control unit; the switching unit comprises an input end, an output end and a control end; the constant-current generating unit is connected in parallel with the input end and the output end, and generates a pre-charging current which is constant in size and is input to the output end when the input end and the output end are disconnected; the comparison control unit generates a control signal which is input to the control end based on the voltage difference between the input end and the output end; when in use, when initially powered on, the application provides the output end of the switching unit with a constant pre-charging current through the constant-current generating unit, guarantees that the current is constant and does not attenuate during the pre-charging process, can shorten the pre-charging time and inhibit the impact current in the initial power-on period, and protects the switching unit and the battery pack; and by adjusting the size of the pre-charging current output by the constant-current generating unit, the bus capacitor with different capacitances and the battery with different voltage grades can be adapted, and the generality is high.