Balance correction apparatus and electric storage system

A balance correction apparatus comprising:

• a first balance correction section which equalizes voltages of a first electric storage cell and a second electric storage cell connected in series based on a first control signal;
• and
• a second balance correction section which equalizes voltages of the first electric storage cell and the second electric storage cell based on a second control signal, wherein
• the first balance correction section and the second balance correction section are respectively connected to the first electric storage cell and the second electric storage cell electrically so that the first balance correction section, the second balance correction section, the first electric storage cell and the second electric storage cell are connected in parallel, wherein
• the first electric storage cell and the second electric storage cell are connected in series,
• a first control signal and a second control signal are generated respectively so that a first current and a second current have different waveforms or phases from each other,
• the first current flows through a connection point of the first electric storage cell and the second electric storage cell via the first balance correction section, and
• the second current flows through a connection point of the first electric storage cell and the second electric storage cell via the second balance correction section.

A balance correction apparatus, comprising:

• a first balance correction section which equalizes voltages of two electric storage cells among a plurality of electric storage cells connected in series;
• a second balance correction section which equalizes voltages of two electric storage cells among the plurality of electric storage cells;
• and
• a control section which controls operations of the first balance correction section and the second balance correction section, wherein
• the control section generates a first control signal which controls operations of the first balance correction section and a second control signal which controls operations of the second balance correction section based on each SOC (State Of Charge) of the plurality of electric storage cells,
• the first balance correction section equalizes voltages of a first electric storage cell and a second electric storage cell included in the plurality of electric storage cells,
• a negative electrode of the first electric storage cell is connected to a positive electrode of the second electric storage cell, and
• the control section compares a first value with a second value and generates the first control signal based on a result of the comparison, wherein
• the first value is obtained by averaging SOC values of one or more of electric storage cells among the plurality of electric storage cells, which is or are disposed between one end of the positive electrode side of the plurality of electric storage cells and a connection point of the first electric storage cell and the second electric storage cell, and
• the second value is obtained by averaging SOC values of one or more of electric storage cells among the plurality of electric storage cells, which is or are disposed between one end of the negative electrode side of the plurality of electric storage cells and a connection point of the first electric storage cell and the second electric storage cell.