Method and apparatus for collecting voltage differential parameters of individual battery cells in battery pack
First Claim
1. A method for collecting voltage differential parameters of individual battery cells in a battery pack, wherein,a reference voltage is provided, the reference voltage is compared with an actual voltage of each individual battery cell at a same moment to obtain a relative voltage difference value between the actual voltage of each individual battery cell and the reference voltage at the current moment;
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the relative voltage difference value of the voltage of each individual battery cell is added with the reference voltage to obtain the actual voltage value of the voltage of each individual battery cell, respectively;
the arithmetic mean value of the actual voltage values of all individual battery cells is calculated as a mean actual voltage value; and
an absolute difference value between the actual voltage value of each individual battery cell and the mean actual voltage value is calculated as an actual voltage difference value between the actual voltage of each individual battery cell and the mean actual voltage value.
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Abstract
The invention belongs to the technical field of battery management, and in particular relates to a method and apparatus for collecting voltage differential parameters of individual battery cells in a battery pack. In the invention, a reference voltage is provided, the reference voltage is compared with an actual voltage of each individual battery cell at a same moment to obtain a relative voltage difference value between the actual voltage of each individual battery cell and the common reference voltage at the current moment; and an actual voltage difference value between the actual voltage of each individual battery cell and an actual average voltage value of the actual voltages of all individual battery cells is determined according to the relative voltage difference value, and each actual voltage difference value is used for representing the voltage differential parameter of the individual battery cell relative to a battery system.
9 Citations
8 Claims
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1. A method for collecting voltage differential parameters of individual battery cells in a battery pack, wherein,
a reference voltage is provided, the reference voltage is compared with an actual voltage of each individual battery cell at a same moment to obtain a relative voltage difference value between the actual voltage of each individual battery cell and the reference voltage at the current moment; - and
an actual voltage difference value between the actual voltage of each individual battery cell and an actual average voltage value of the actual voltages of all individual battery cells is determined according to the relative voltage difference value, and each actual voltage difference value is used for representing the voltage differential parameter of the individual battery cell relative to a battery system, wherein, the actual voltage difference value between the voltage of each individual battery cell and the mean actual voltage value of the voltages of all individual battery cells is determined according to each relative voltage difference value, specifically; the relative voltage difference value of the voltage of each individual battery cell is added with the reference voltage to obtain the actual voltage value of the voltage of each individual battery cell, respectively; the arithmetic mean value of the actual voltage values of all individual battery cells is calculated as a mean actual voltage value; and an absolute difference value between the actual voltage value of each individual battery cell and the mean actual voltage value is calculated as an actual voltage difference value between the actual voltage of each individual battery cell and the mean actual voltage value. - View Dependent Claims (2)
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3. A apparatus for collecting voltage differential parameters of individual battery cells in a battery pack, comprising:
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at least one comparison amplification circuit, a reference voltage source electrically connected to each of the comparison amplification circuits, and a main controller; the reference voltage source is used for providing a reference voltage at the same moment and inputting the reference voltage to a second comparison voltage input end of each comparison amplification circuit; the number of the comparison amplification circuits is the same as that of the individual battery cells contained in the battery pack, a first comparison voltage input end of each of the comparison amplification circuits is connected to an anode or a cathode of a individual battery cell, respectively, for collecting the voltage of each individual battery cell, the comparison amplification circuits are used for comparing the actual voltages of each individual battery cell input by the first comparison voltage input end and the second comparison voltage input end with the reference voltage to obtain a relative voltage difference value between the actual voltage of each individual battery cell and the reference voltage; and the main controller is electrically connected with each of the comparison amplification circuits and used for determining an actual voltage difference value between the actual voltage of each individual battery cell and the mean actual voltage value of the voltages of all individual battery cells according to each relative voltage difference value. - View Dependent Claims (4, 5, 6, 7)
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8. A method for collecting voltage differential parameters of individual battery cells in a battery pack, wherein,
a reference voltage is provided, the reference voltage is compared with an actual voltage of each individual battery cell at a same moment to obtain a relative voltage difference value between the actual voltage of each individual battery cell and the reference voltage at the current moment; - and
an actual voltage difference value between the actual voltage of each individual battery cell and an actual average voltage value of the actual voltages of all individual battery cells is determined according to the relative voltage difference value, and each actual voltage difference value is used for representing the voltage differential parameter of the individual battery cell relative to a battery system, wherein, each actual voltage difference value is respectively determined according to each relative voltage difference value, specifically; an arithmetic mean value of the relative voltage difference value between the actual voltages of all individual battery cells and the reference voltage is calculated as a mean relative voltage difference value; and an absolute difference value between the relative voltage difference values and the mean relative voltage difference value is calculated, and each absolute difference value is used as an actual voltage difference value between the actual voltage of each individual battery cell and the mean actual voltage value.
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Specification