Locomotive having a battery system and method for monitoring a battery
First Claim
1. A method for monitoring a battery, the battery having a first plurality of cells electrically coupled in series to one another, the first plurality of cells comprising a second plurality of cells and a third plurality of cells electrically coupled together at a node, each cell of the first plurality of cells having a desired output voltage level during desired operation and failing in a shorted operational condition, the method comprising:
- measuring a first voltage level of the first plurality of cells of the battery when the first plurality of cells are not electrically coupled to a load;
measuring a second voltage level at the node between the second plurality of cells and the third plurality of cells when the first plurality of cells are electrically coupled to the load;
calculating a first number of failed cells in the first plurality cells based on the first voltage level, the desired output voltage level of each cell of the first plurality of cells and a number of cells in the first plurality of cells;
calculating a second number of failed cells in the second plurality cells based on the first number of failed cells, the desired output voltage level of each cell of the first plurality of cells, and the second voltage level; and
calculating a third number of failed cells in the third plurality cells based on the first number of failed cells, the desired output voltage level of each cell of the first plurality of cells, and the second voltage level.
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Accused Products
Abstract
A locomotive, a battery system and a method for monitoring a battery are provided. The battery has a first plurality of cells electrically coupled in series to one another. The first plurality of cells includes a second plurality of cells and a third plurality of cells electrically coupled together at a node. The method includes calculating a first number of failed cells in the first plurality cells. The method further includes calculating a second number of failed cells in the second plurality cells and a third number of failed cells in the third plurality cells.
21 Citations
18 Claims
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1. A method for monitoring a battery, the battery having a first plurality of cells electrically coupled in series to one another, the first plurality of cells comprising a second plurality of cells and a third plurality of cells electrically coupled together at a node, each cell of the first plurality of cells having a desired output voltage level during desired operation and failing in a shorted operational condition, the method comprising:
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measuring a first voltage level of the first plurality of cells of the battery when the first plurality of cells are not electrically coupled to a load;
measuring a second voltage level at the node between the second plurality of cells and the third plurality of cells when the first plurality of cells are electrically coupled to the load;
calculating a first number of failed cells in the first plurality cells based on the first voltage level, the desired output voltage level of each cell of the first plurality of cells and a number of cells in the first plurality of cells;
calculating a second number of failed cells in the second plurality cells based on the first number of failed cells, the desired output voltage level of each cell of the first plurality of cells, and the second voltage level; and
calculating a third number of failed cells in the third plurality cells based on the first number of failed cells, the desired output voltage level of each cell of the first plurality of cells, and the second voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery system, comprising:
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a battery having a first plurality of cells electrically coupled in series to one another between a first battery terminal and a second battery terminal, the first plurality of cells comprising a second plurality of cells and a third plurality of cells coupled together at a node, each cell of the first plurality of cells having a desired output voltage level during desired operation; and
a battery monitor electrically coupled to the battery at the node and at the first and second battery terminals, the battery monitor configured to measure a first voltage level of the first plurality of cells of the battery when the first plurality of cells are not coupled to a load, the battery monitor further configured to measure a second voltage level at the node between the second plurality of cells and the third plurality of cells when the first plurality of cells are coupled to the load, the battery monitor further configured to calculate a first number of failed cells of the first plurality of cells based on the first voltage level, the desired output voltage level of each cell of the first plurality of cells and a number of cells in the first plurality of cells, the battery monitor further configured to calculate a second number of failed cells of the second plurality of cells based on the second voltage level, the desired output voltage level of each cell of the first plurality of cells and the first number of failed cells, and the battery monitor further configured to calculate a third number of failed cells of the third plurality of cells based on the second voltage level, the desired output voltage level of each cell of the first plurality of cells and the first number of failed cells. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A locomotive, comprising:
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an electrically powered traction motor;
a battery configured to supply electrical power to the traction motor, the battery having a first plurality of cells electrically coupled in series to one another between a first battery terminal and a second battery terminal, the first plurality of cells comprising a second plurality of cells and a third plurality of cells coupled together at a node, each cell of the first plurality of cells having a desired output voltage level during desired operation; and
a battery monitor electrically coupled to the battery at the node and at the first and second battery terminals, the battery monitor configured to measure a first voltage level of the first plurality of cells of the battery when the first plurality of cells are not coupled to a load, the battery monitor further configured to measure a second voltage level at the node between the second plurality of cells and the third plurality of cells when the first plurality of cells are coupled to the load, the battery monitor further configured to calculate a first number of failed cells of the first plurality of cells based on the first voltage level, the desired output voltage level of each cell of the first plurality of cells and a number of cells in the first plurality of cells, the battery monitor further configured to calculate a second number of failed cells of the second plurality of cells based on the second voltage level, the desired output voltage level of each cell of the first plurality of cells and the first number of failed cells, and the battery monitor further configured to calculate a third number of failed cells of the third plurality of cells based on the second voltage level, the desired output voltage level of each cell of the first plurality of cells and the first number of failed cells.
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Specification