Power supply controller, electric vehicle and battery control unit
First Claim
1. A power supply controller used for controlling the status of connection between a battery pack formed by combining a plurality of single cells or unit cells that are secondary batteries, and a load attached to the battery pack, the power supply controller comprising:
- contact switching devices provided between the battery pack and the load;
a voltage measurement part for measuring voltage block-by-block on a time series basis, with each block containing a predetermined number of single cells or unit cells from the battery pack;
a current measuring circuit for measuring electric current flowing in the battery pack with the same timing as the timing used by the voltage measurement part to measure the voltage of each block;
an electric power computation part for receiving a voltage for each block from the voltage measurement part and an electric current from the current measuring circuit and calculating an electric power for each block;
a counter for counting the number of times the electric power of each block calculated by the electric power computation part exceeds a permissible electric power value; and
a control circuit controlling the contact switching devices to an open state at the point when a count value of the counter is equal to or higher than a preset value.
2 Assignments
0 Petitions
Accused Products
Abstract
A voltage measurement part 200 measures voltage Vn for each of the blocks of a battery pack 7, electric current In is measured with the same timing by a current measuring circuit 201, and a counter 206 counts the number of times an effective load power Pn obtained from a product of the electric current and voltage of each block by an electric power computation part 203 exceeds permissible electric power values Pcn and Pdn calculated by a permissible electric power computation part 205, such that when the count value is equal to or higher than a preset value, a decision part 207 outputs a contactor opening request signal Copen so as to bring the contactors into an open state and protect the battery pack.
59 Citations
9 Claims
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1. A power supply controller used for controlling the status of connection between a battery pack formed by combining a plurality of single cells or unit cells that are secondary batteries, and a load attached to the battery pack, the power supply controller comprising:
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contact switching devices provided between the battery pack and the load; a voltage measurement part for measuring voltage block-by-block on a time series basis, with each block containing a predetermined number of single cells or unit cells from the battery pack; a current measuring circuit for measuring electric current flowing in the battery pack with the same timing as the timing used by the voltage measurement part to measure the voltage of each block; an electric power computation part for receiving a voltage for each block from the voltage measurement part and an electric current from the current measuring circuit and calculating an electric power for each block; a counter for counting the number of times the electric power of each block calculated by the electric power computation part exceeds a permissible electric power value; and a control circuit controlling the contact switching devices to an open state at the point when a count value of the counter is equal to or higher than a preset value. - View Dependent Claims (2, 3, 4)
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5. An electric vehicle that moves by converting DC power from a battery pack formed by combining a plurality of single cells or unit cells that are secondary batteries to AC power using an inverter and supplying it to a motor, wherein the electric vehicle comprises:
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at least two contact switching devices provided between the battery pack and the inverter; a voltage measurement part for measuring voltage block-by-block on a time series basis, with each block containing a predetermined number of single cells or unit cells from the battery pack; a current measuring circuit for measuring electric current flowing in the battery pack with the same timing as the one used by the voltage measurement part to measure the voltage of each block; an electric power computation part for receiving a voltage for each block from the voltage measurement part and an electric current from the current measuring circuit and calculating an electric power for each block; a counter for counting the number of times the electric power of each block calculated by the electric power computation part exceeds a permissible electric power value; and a control circuit controlling the contact switching devices to be in an open state at the point when the count value of the counter is equal to or higher than a preset value. - View Dependent Claims (6, 7, 8)
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9. A battery control unit controlling the condition of a battery pack formed by combining a plurality of single cells or unit cells that are secondary batteries, the battery control unit comprising:
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a voltage measurement part for measuring voltage block-by-block on a time series basis, with each block containing a predetermined number of single cells or unit cells from the battery pack; a current measuring circuit for measuring electric current flowing in the battery pack with the same timing as the one used by the voltage measurement part to measure the voltage of each block; an electric power computation part for receiving a voltage for each block from the voltage measurement part and an electric current from the current measuring circuit and calculating an electric power for each block; a counter for counting the number of times the electric power of each block calculated by the electric power computation part exceeds a permissible electric power value; and a decision part for deciding whether the count value of the counter has reached a preset value and sending the decision results out.
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Specification