Voltage detection device, voltage detection method, abnormality determination device, abnormality determination method, and battery pack system
First Claim
1. A voltage detection device configured to detect a voltage of a battery stack of a battery pack comprising a plurality of battery stacks, each of the plurality of battery stacks having a plurality of battery cells connected in series, the voltage detection device comprising:
- a capacitor configured to be selectively provided as a parallel circuit to each of the plurality of battery stacks;
a plurality of switches, each of the plurality of switches having one end provided so as to be electrically connected to a terminal of each of the plurality of battery stacks and the other end provided so as to be electrically connected to the capacitor, the capacitor being connected to the plurality of battery stacks by the plurality of switches;
at least one connection member, each connection member being configured to be provided between respective battery stacks of the plurality of battery stacks and configured to be connected to at least one of the plurality of switches;
a detection unit configured to detect a voltage of the capacitor; and
a control unit configured to control the plurality of switches,wherein the control unit comprises;
a discharging path selection unit that selects a discharging path comprising the connection member and the capacitor, by switching the plurality of switches, when discharging the capacitor, anda determination unit configured to determine that an abnormality has occurred in the battery pack or at least one of the plurality of switches when at least one of a voltage of the capacitor after charging and a voltage of the capacitor after discharging is less than or equal to a predetermined threshold.
1 Assignment
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Accused Products
Abstract
A voltage detection device includes battery stacks, and a connection member configured to electrically connect the battery stacks. The voltage detection device includes: a capacitor connected to each battery stack in parallel; switches, each of which having one end connected to a terminal of each battery stack and the other end connected to the capacitor; a detection unit configured to detect a voltage of the capacitor, and a control unit configured to control the switches, in which the control unit comprises: a discharging path selection unit that selects a discharging path comprising the connection member and the capacitor when discharging the capacitor, and a determination unit configured to determine whether an abnormality has occurred in the battery pack or at least one of the switches, in correspondence to at least one of a voltage of the capacitor after charging and a voltage of the capacitor after discharging.
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Citations
16 Claims
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1. A voltage detection device configured to detect a voltage of a battery stack of a battery pack comprising a plurality of battery stacks, each of the plurality of battery stacks having a plurality of battery cells connected in series, the voltage detection device comprising:
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a capacitor configured to be selectively provided as a parallel circuit to each of the plurality of battery stacks; a plurality of switches, each of the plurality of switches having one end provided so as to be electrically connected to a terminal of each of the plurality of battery stacks and the other end provided so as to be electrically connected to the capacitor, the capacitor being connected to the plurality of battery stacks by the plurality of switches; at least one connection member, each connection member being configured to be provided between respective battery stacks of the plurality of battery stacks and configured to be connected to at least one of the plurality of switches; a detection unit configured to detect a voltage of the capacitor; and a control unit configured to control the plurality of switches, wherein the control unit comprises; a discharging path selection unit that selects a discharging path comprising the connection member and the capacitor, by switching the plurality of switches, when discharging the capacitor, and a determination unit configured to determine that an abnormality has occurred in the battery pack or at least one of the plurality of switches when at least one of a voltage of the capacitor after charging and a voltage of the capacitor after discharging is less than or equal to a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A voltage detection method of detecting a voltage of a battery stack of a battery pack comprising a plurality of battery stacks, each of the plurality of battery stacks having a plurality of battery cells connected in series, the voltage detection method comprising:
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controlling a plurality of switches, each of the plurality of switches having one end provided so as to be electrically connected to a terminal of each of the plurality of battery stacks and the other end provided so as to be electrically connected to a capacitor, the capacitor being configured to be selectively provided as a parallel circuit to each of the plurality of battery stacks, and the capacitor being connected to the plurality of battery stacks by the plurality of switches; detecting a voltage of the capacitor; when discharging the capacitor, selecting a discharging path comprising at least one connection member, each connection member being configured to be provided between respective battery stacks of the plurality of battery stacks and configured to be connected to at least one of the plurality of switches and the capacitor, by switching the plurality of switches, and determining that an abnormality has occurred in the battery pack or at least one of the plurality of switches when at least one of a voltage of the capacitor after charging and a voltage of the capacitor after discharging is less than or equal to a predetermined threshold.
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11. An abnormality determination device configured to determine whether an abnormality has occurred in a battery pack comprising a plurality of battery stacks, each of the plurality of battery stacks having a plurality of battery cells connected in series, the abnormality determination device comprising:
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a capacitor configured to be selectively provided as a parallel circuit to the plurality of battery stacks; a plurality of switches, each of the plurality of switches having one end provided so as to be electrically connected to a terminal of each of the plurality of battery stacks and the other end provided so as to be electrically connected to the capacitor, the capacitor being connected to the plurality of battery stacks by the plurality of switches; at least one connection member, each connection member being configured to be provided between respective battery stacks of the plurality of battery stacks and configured to be connected to at least one of the plurality of switches; a detection unit configured to detect a voltage between both ends of the capacitor; a charging path selection unit that selects a charging path of the capacitor, by switching the plurality of switches, when charging the capacitor; a discharging path selection unit that selects a discharging path comprising the connection member and the capacitor when discharging the capacitor; and a determination unit configured to determine that an abnormality has occurred in the battery pack, based on pack when a voltage of the capacitor after discharging the capacitor is less than or equal to a predetermined threshold. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification