CHARGING/DISCHARGING CONTROL DEVICE, BATTERY PACK, ELECTRICAL EQUIPMENT, AND CHARGING/DISCHARGING CONTROL METHOD
First Claim
1. A charging/discharging control device that controls charging/discharging of a battery arranged in a battery pack and obtained by connecting at least one chargeable/dischargeable battery cell in series, comprising:
- first and second switches that are connected in parallel on current paths between the battery and an external terminal of the battery pack;
a switching control unit that switches between a charging current path and a discharging current path by turning on the first switch and turning off the second switch during a charging operation and turning off the first switch and turning on the second switch during a discharging operation;
a first protective element that fuses the charging current path when a current value of the charging current path flowing through the first switch exceeds a first fusing current value; and
a second protective element that fuses the discharging current path when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value higher than the first current value.
1 Assignment
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Accused Products
Abstract
A charging/discharging control device that can protect a chargeable/dischargeable battery cell from an excess current state while preventing the device from being increased in scale and from being complex. The charging/discharging control device includes: switches that are connected in parallel on current paths between a battery and a positive terminal of a battery pack; a switching control unit that switches between a charging current path and a discharging current path; a protective element that fuses the charging current path when a current value of the charging current path flowing through the switch exceeds a first fusing current value; and a protective element that fuses the discharging current path when a current value of the discharging current path flowing through the switch exceeds a second fusing current value higher than the first fusing current value.
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Citations
10 Claims
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1. A charging/discharging control device that controls charging/discharging of a battery arranged in a battery pack and obtained by connecting at least one chargeable/dischargeable battery cell in series, comprising:
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first and second switches that are connected in parallel on current paths between the battery and an external terminal of the battery pack; a switching control unit that switches between a charging current path and a discharging current path by turning on the first switch and turning off the second switch during a charging operation and turning off the first switch and turning on the second switch during a discharging operation; a first protective element that fuses the charging current path when a current value of the charging current path flowing through the first switch exceeds a first fusing current value; and a second protective element that fuses the discharging current path when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value higher than the first current value. - View Dependent Claims (2, 3, 4, 5, 9, 10)
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6. A battery pack that includes
a battery obtained by connecting at least one chargeable/dischargeable battery cell in series and a charging/discharging control circuit that controls charging/discharging of the battery, wherein the charging/discharging control circuit comprises: -
first and second switches that are connected in parallel on current paths between the battery and an external terminal of the battery pack; a switching control unit that switches between a charging current path and a discharging current path by turning on the first switch and turning off the second switch during a charging operation and turning off the first switch and turning on the second switch during a discharging operation; a voltage detection unit that detects a voltage of the battery cell; a first protective element that fuses the charging current path when a current value of the charging current path flowing through the first switch exceeds a first fusing current value; and a second protective element that fuses the discharging current path when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value higher than the first current value.
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7. Electrical equipment that includes a battery pack having a battery obtained by connecting at least one chargeable/dischargeable battery cell in series and a charging/discharging control circuit that controls charging/discharging of the battery, and
an equipment main body that is detachably connected to the battery pack and charges the battery pack or is driven with a power supply from the battery pack, wherein the charging/discharging control circuit comprises: -
first and second switches that are connected in parallel on current paths between the battery and an external terminal of the battery pack; a switching control unit that switches between a charging current path and a discharging current path by turning on the first switch and turning off the second switch during a charging operation and turning off the first switch and turning on the second switch during a discharging operation; a voltage detection unit that detects a voltage of the battery cell; a first protective element that fuses the charging current path when a current value of the charging current path flowing through the first switch exceeds a first fusing current value; and a second protective element that fuses the discharging current path when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value higher than the first current value.
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8. A charging/discharging control method that controls charging/discharging of a battery obtained by connecting at least one chargeable/dischargeable battery cell in series,
by using first and second switches that are connected in parallel on current paths between the battery and an external terminal of the battery pack, a charging current path and a discharging current path are switched by turning on the first switch and turning off the second switch during a charging operation and turning off the first switch and turning on the second switch during a discharging operation, a first protective element connected to the charging current path is fused when a current value of the charging current path flowing through the first switch exceeds a first fusing current value, and a second protective element connected to the discharging current path is fused when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value higher than the first current value.
Specification