BATTERY PACK AND BATTERY PACK CONTROLLER
First Claim
1. A battery pack that is electrically connected to a load, and that performs charging and discharging between the load, comprising:
- a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with the cell group;
a first control unit that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit;
a voltage measurement unit that measures the voltage of the cell group or cells included in each of the battery unit; and
a diagnosis unit that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement unit, whereinthe diagnosis unit calculates the DC internal resistance value of each battery unit on the basis of the voltage under load of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element on and the charging/discharging current is flowing to the load, on the basis of the charging/discharging current, and on the basis of the open circuit voltage of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element off and intercepts the charging/discharging current, and thereby diagnoses the deterioration level of each battery unit on the basis of the results of this calculation.
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Accused Products
Abstract
A battery pack includes a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with this cell group, a first control means that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement means that measures the voltage of the cell group or cells included in each of the battery unit, and a diagnosis means that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement means.
34 Citations
18 Claims
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1. A battery pack that is electrically connected to a load, and that performs charging and discharging between the load, comprising:
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a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with the cell group; a first control unit that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement unit that measures the voltage of the cell group or cells included in each of the battery unit; and a diagnosis unit that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement unit, wherein the diagnosis unit calculates the DC internal resistance value of each battery unit on the basis of the voltage under load of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element on and the charging/discharging current is flowing to the load, on the basis of the charging/discharging current, and on the basis of the open circuit voltage of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element off and intercepts the charging/discharging current, and thereby diagnoses the deterioration level of each battery unit on the basis of the results of this calculation. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 17)
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2. (canceled)
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13. A battery pack controller for a battery pack that comprises a plurality of battery units mutually connected in parallel, each including a cell group in which one or two or more secondary cells are connected in series, and a first current control element that is connected in series with the cell group, the battery pack being electrically connected to a load and performing charging and discharging between the load, comprising:
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a first control unit that controls the charging/discharging current for each battery unit by controlling the operation of the first current control element included in each of the battery unit; a voltage measurement unit that measures the voltage of the cell group or cells included in each of the battery unit; and a diagnosis unit that diagnoses a deterioration level or a fault of each battery unit on the basis of the voltage of the cell group or cells measured by the voltage measurement unit, wherein the diagnosis unit calculates the DC internal resistance value of each battery unit on the basis of the voltage under load of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element on and the charging/discharging current is flowing to the load, on the basis of the charging/discharging current, and on the basis of the open circuit voltage of the cell group or cells measured by the voltage measurement unit when the first control unit turns the first current control element off and intercepts the charging/discharging current, and thereby diagnoses the deterioration level of each battery unit on the basis of the results of this calculation. - View Dependent Claims (15, 16, 18)
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14. (canceled)
Specification