ASSEMBLED BATTERY SYSTEM AND FAILURE DETECTION METHOD OF ASSEMBLED BATTERY SYSTEM
First Claim
1. An assembled battery system, comprising:
- an assembled battery having a plurality of serially-connected battery cells;
voltage detecting lines connectable at one ends to electrodes of the battery cells of the assembled battery as a voltage measurement target;
electric resistors serially-connected at one ends to the other ends of the voltage detecting lines;
capacitors connected to the other ends of the electric resistors, each of the capacitors being configured to electrically interconnect one of the voltage detecting lines and the other voltage detecting line;
voltage measuring circuits connected respectively to each of the voltage detecting lines and configured to detect an electric potential difference between one of the voltage detecting lines and the other voltage detecting line;
electrically openable short-circuiting switches arranged between the capacitors and the voltage measuring circuits and parallel-connected to the capacitors, the voltage measuring circuits being configured to obtain a first measurement result by measuring an electric potential difference appearing between the opposite ends of the short-circuiting switches when one of the short-circuiting switches is opened and the other short-circuiting switches electrically adjoining to the opposite ends of one of the short-circuiting switches are opened, the voltage measuring circuits being further configured to obtain a second measurement result by measuring an electric potential difference appearing between the opposite ends of the short-circuiting switches when one of the short-circuiting switches is closed and the other short-circuiting switches electrically adjoining to the opposite ends of one of the short-circuiting switches are opened; and
a monitoring circuit configured to detect a difference between the first measurement result and the second measurement result with respect to each of the short-circuiting switches and to detect at least one of a failure based on the difference between the first measurement result and the second measurement result.
1 Assignment
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Accused Products
Abstract
An assembled battery system is disclosed that includes a plurality of serially-connected battery cells; voltage detecting lines connectable at one ends to electrodes of the battery cells of the assembled battery; electric resistors serially-connected at one ends to the other ends of the voltage detecting lines; capacitors connected to the other ends of the electric resistors, each of the capacitors being configured to electrically interconnect one of the voltage detecting lines and the other voltage detecting line; voltage measuring circuits connected respectively to each of the voltage detecting lines; electrically openable short-circuiting switches arranged between the capacitors and the voltage measuring circuits and parallel-connected to the capacitors; and a monitoring circuit that detects a difference between a first measurement result and a second measurement result with respect to each of the short-circuiting switches and a failure of the voltage detecting lines, the short-circuiting switches or the voltage measuring circuits.
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Citations
20 Claims
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1. An assembled battery system, comprising:
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an assembled battery having a plurality of serially-connected battery cells; voltage detecting lines connectable at one ends to electrodes of the battery cells of the assembled battery as a voltage measurement target; electric resistors serially-connected at one ends to the other ends of the voltage detecting lines; capacitors connected to the other ends of the electric resistors, each of the capacitors being configured to electrically interconnect one of the voltage detecting lines and the other voltage detecting line; voltage measuring circuits connected respectively to each of the voltage detecting lines and configured to detect an electric potential difference between one of the voltage detecting lines and the other voltage detecting line; electrically openable short-circuiting switches arranged between the capacitors and the voltage measuring circuits and parallel-connected to the capacitors, the voltage measuring circuits being configured to obtain a first measurement result by measuring an electric potential difference appearing between the opposite ends of the short-circuiting switches when one of the short-circuiting switches is opened and the other short-circuiting switches electrically adjoining to the opposite ends of one of the short-circuiting switches are opened, the voltage measuring circuits being further configured to obtain a second measurement result by measuring an electric potential difference appearing between the opposite ends of the short-circuiting switches when one of the short-circuiting switches is closed and the other short-circuiting switches electrically adjoining to the opposite ends of one of the short-circuiting switches are opened; and a monitoring circuit configured to detect a difference between the first measurement result and the second measurement result with respect to each of the short-circuiting switches and to detect at least one of a failure based on the difference between the first measurement result and the second measurement result. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting failures in a battery comprising:
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opening a selected short circuiting switch; opening short circuiting switches located adjacent to the selected short circuiting switch; measuring the voltages of the open selected and open adjacent short circuiting switches to determine first voltage values; closing the selected short circuiting switch; measuring the voltage of the closed selected short circuiting switch to determine a second voltage value of the selected short circuiting switch; measuring the voltages of the adjacent short circuiting switches to determine second voltage values of the adjacent short circuiting switches after the selected switch is closed; and determining the occurrence of a fault based on the measured voltages. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for detecting failures in a battery comprising the steps of:
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(a) turning off all short-circuiting switches in the battery; (b) measuring first voltages of all battery cells in the battery; (c) turning on a selected short-circuiting switch; (d) measuring a second voltage of a selected battery cell that is associated with the selected short-circuiting switch; (e) measuring a second voltage of battery cells adjacent to the selected battery cell; and (f) detecting a failure based on the measured voltages. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification