POWER STORAGE SYSTEM
First Claim
1. A power storage system comprising:
- a plurality of battery modules that are connected in parallel and that are connected to a power converter that controls charging and discharging;
a plurality of on/off devices that are provided between each of the battery modules and the power converter; and
a control unit that controls the on/off devices, each of the battery modules having a battery pack with a plurality of batteries connected in series; and
a cell balancing circuit provided in correspondence to the battery pack, wherein the control unit sets the on/off device corresponding to the battery module where cell balance control is conducted to an open state when the cell balance control by the cell balancing circuit is started; and
sets the on/off device, which has been in the open state, to a closed state when the cell balance control is completed and a difference between a terminal voltage of the battery module where the cell balance control has been conducted and a terminal voltage of the other battery modules falls within a preset allowable range.
1 Assignment
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Accused Products
Abstract
An object is to reliably conduct cell balancing operation while suppressing deterioration of batteries and maintaining operating efficiency. When the cell balance control by the cell balancing circuit 3 is started, the system control device 30 sets an on/off device corresponding to the arm where the cell balance control is conducted to the open state; and when the cell balance control is completed, and the difference between the terminal voltage of a battery pack of the arm where the cell balance control has been conducted and the terminal voltages of the battery packs of the other arms falls within a preset allowable range, sets the on/off device, which has been in the open state, to the closed state.
32 Citations
13 Claims
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1. A power storage system comprising:
- a plurality of battery modules that are connected in parallel and that are connected to a power converter that controls charging and discharging;
a plurality of on/off devices that are provided between each of the battery modules and the power converter; and
a control unit that controls the on/off devices, each of the battery modules having a battery pack with a plurality of batteries connected in series; and
a cell balancing circuit provided in correspondence to the battery pack, wherein the control unit sets the on/off device corresponding to the battery module where cell balance control is conducted to an open state when the cell balance control by the cell balancing circuit is started; and
sets the on/off device, which has been in the open state, to a closed state when the cell balance control is completed and a difference between a terminal voltage of the battery module where the cell balance control has been conducted and a terminal voltage of the other battery modules falls within a preset allowable range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- a plurality of battery modules that are connected in parallel and that are connected to a power converter that controls charging and discharging;
Specification