Battery pack
First Claim
Patent Images
1. A battery pack, comprising:
- a battery set which includes a plurality of series modules connected in parallel having a plurality of secondary-battery cells connected in series, each of the secondary-battery cells forming each series module being connected in parallel; and
a battery-abnormality detection circuit which detects an abnormal state in the battery set, wherein;
the battery set further includes,a plurality of parallel-connection separation switches which electrically separate the secondary-battery cells connected in parallel, anda plurality of battery-set circuit separation switches which separate the series modules having the secondary-battery cells separated by the parallel-connection separation switches from a battery-set body connected to an external circuit;
the battery-abnormality detection circuit further includes a detection-circuit changing switch which changes the connection state to the battery set, so as to detect the voltage of the secondary-battery cells connected in parallel when the parallel-connection separation switch is turned on and so as to detect the voltage of each secondary-battery cell whose parallel connection is separated when the parallel-connection separation switch is turned off; and
the battery-abnormality detection circuit controls the battery-set circuit separation switch, so as to detect an abnormal state in each secondary-battery cell, based on a change in the voltage of each secondary-battery cell whose parallel connection is separated when the parallel-connection separation switch is turned off and so as to separate, from the battery-set body, the series module including the secondary-battery cell whose abnormal state is detected.
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Abstract
A battery pack is provided which includes: a battery set having a plurality of secondary-battery cells connected in series and in parallel; and a battery-abnormality detection circuit. The battery-abnormality detection circuit controls a battery-set circuit separation switch, so as to detect an abnormality in each secondary-battery cell based on a change in the voltage of each cell when parallel-connection separation switches are turned off, and if detecting an abnormal secondary-battery cell, so as to separate the series module including this cell from a battery-set body.
50 Citations
11 Claims
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1. A battery pack, comprising:
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a battery set which includes a plurality of series modules connected in parallel having a plurality of secondary-battery cells connected in series, each of the secondary-battery cells forming each series module being connected in parallel; and a battery-abnormality detection circuit which detects an abnormal state in the battery set, wherein; the battery set further includes, a plurality of parallel-connection separation switches which electrically separate the secondary-battery cells connected in parallel, and a plurality of battery-set circuit separation switches which separate the series modules having the secondary-battery cells separated by the parallel-connection separation switches from a battery-set body connected to an external circuit; the battery-abnormality detection circuit further includes a detection-circuit changing switch which changes the connection state to the battery set, so as to detect the voltage of the secondary-battery cells connected in parallel when the parallel-connection separation switch is turned on and so as to detect the voltage of each secondary-battery cell whose parallel connection is separated when the parallel-connection separation switch is turned off; and the battery-abnormality detection circuit controls the battery-set circuit separation switch, so as to detect an abnormal state in each secondary-battery cell, based on a change in the voltage of each secondary-battery cell whose parallel connection is separated when the parallel-connection separation switch is turned off and so as to separate, from the battery-set body, the series module including the secondary-battery cell whose abnormal state is detected. - View Dependent Claims (2, 3)
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4. A battery pack, comprising:
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a battery set which includes a plurality of series modules connected in parallel having a plurality of secondary-battery cells connected in series, each of the secondary-battery cells forming each series module being connected in parallel; and a battery-abnormality detection circuit which individually detects the voltage of each secondary-battery cell forming each series module, and based on a change in the voltage of each secondary-battery cell, individually detects an abnormal state in each secondary-battery cell, wherein; the battery set further includes a plurality of battery-set circuit separation switches which separate each series module from an external load; and the battery-abnormality detection circuit controls the connection state of the plurality of battery-set circuit separation switches, so as to electrically separate, from the external load, the series module including the secondary-battery cell whose abnormal state is detected, wherein;
the battery set further includes a plurality of parallel-connection separation switches which individually separate the secondary-battery cells connected in parallel; and
the battery-abnormality detection circuit controls the connection state of the plurality of battery-set circuit separation switches, so as to detect the voltage of each secondary-battery cell whose parallel connection is separated when the parallel-connection separation switch is turned off and so as to electrically separate. from the external load, the series module including the secondary-battery cell whose abnormal state is detected. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification