Battery device, detection method thereof, and screening method and device of battery unit

A screening method of a battery unit, comprising:

• determining a characteristic value of each of a plurality of battery units to be selected, wherein the characteristic value is determined according to a minimum value of a discharge DVA curve of the battery unit obtained during a discharge process;
• calculating a difference between the characteristic values of any two of the plurality of battery units;
• and
• selecting the battery unit with the difference between the characteristic values of any two of the plurality of battery units within a preset range, for assembling the selected battery unit to be loaded onto vehicles;
• wherein determining the characteristic value of each of the plurality of battery units to be selected comprises:
• for any one of the plurality of battery units, executing a following process:
• according to N different preset discharge conditions, respectively discharging any one of the plurality of battery units to obtain N corresponding discharge DVA curves, where Nis an integer greater than 1;
• determining a minimum value in each of the discharge DVA curves;
• calculating a difference between any two of the minimum values;
• and
• according to the calculated difference between the minimum values, determining the characteristic value of the one of the plurality of battery units.

A detection method of a battery device, comprising:

• when the battery device comprises a plurality of battery units, determining a characteristic value of each of the plurality of battery units, wherein the characteristic value is determined according to a minimum value of a discharge DVA curve of the battery unit obtained during a discharge process;
• calculating a difference between the characteristic values of any two of the plurality of battery units, such that the battery unit with the difference between the characteristic values of any two of the plurality of battery units within a preset range is selected for assembling the selected battery unit to be loaded onto vehicles;
• and
• according to the difference between the characteristic values of any two of the plurality of battery units, determining a consistency of the battery device;
• wherein determining the characteristic value of each of the plurality of battery units comprises:
• for any one of the plurality of battery units, executing a following process:
• according to N different preset discharge conditions, respectively discharging any one of the plurality of battery units to obtain N corresponding discharge DVA curves, where Nis an integer greater than 1;
• determining a minimum value in each of the discharge DVA curves;
• calculating a difference between any two of the minimum values;
• and
• according to the calculated difference between the minimum values, determining the characteristic value of the one of the plurality of battery units.