US 9,312,703 B2Granted

Charge control method and discharge control method for electric storage apparatus

AssigneeYoshifumi Takeda

InventorsHarumi Takeda, Yoshifumi Takeda

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Abstract

According to the charge control method of the present invention, as an electric storage means, a group of capacitors is used that include 2n (where n is an integer of 2 or more) electric double layer capacitors, from first to 2n-th electric double layer capacitors, having an equal electrostatic capacity, and that is configured such that adjacent electric double layer capacitors are connected either in series or in parallel by a switch and the 2n-th electric double layer capacitor and the first electric double layer capacitor are connected in parallel by a switch. Among the 2n capacitors Ci constituting the electric storage unit 21, adjacent capacitors are sequentially switched from a series connection to a parallel connection, or the 2n-th capacitor C2n and the first capacitor C1 are switched to a parallel connection state, whereby variations in the inter-terminal voltages of the capacitors are suppressed.

Claims5

Dependent claims

A charge control method for an electric storage apparatus that uses, as an electric storage means, a group of capacitors that include 2n (where n is an integer of 2 or more) electric double layer capacitors, from first to 2n-th electric double layer capacitors, having an equal electrostatic capacity, and that is configured such that adjacent electric double layer capacitors can be connected either in series or in parallel by a switch and the 2n-th electric double layer capacitor and the first electric double layer capacitor can be connected in parallel by a switch, the charge control method comprising:

wherein where two electric double layer capacitors connected in parallel are defined as a parallel section, charging is started from a state in which all of the electric double layer capacitors are connected in series, and first processing and second processing are repeated until a number P of parallel sections reaches n, and an inter-terminal voltage of at least one of the 2n electric double layer capacitors reaches an upper rated voltage,
the first processing includes:
when the number P of parallel sections is 1 or greater, i is an integer whose value cycles from 1 to 2n, each value for kj (j is an integer that satisfies 1≦j≦P) is 0 or an even number satisfying 0≦kj≦2n−2, and while a value corresponding to i is increased by one every time a predetermined period of time passes, a connection state of an (i+kj)th capacitor and an (i+kj+1)th capacitor is switched to a parallel connection state so as to constitute the parallel section, and at the same time connection states of the other electric double layer capacitors are caused to be in a series connection state, where when K is an integer, a (2n+K)th electric double layer capacitor is a Kth electric double layer capacitor, and
the second processing includes:
when a voltage of the electric storage means reaches a preset first voltage value, the number P of parallel sections is increased by one.

2 more elements

A discharge control method for an electric storage apparatus that uses, as an electric storage means, a group of capacitors that include 2n (where n is an integer of 2 or more) electric double layer capacitors, from first to 2n-th electric double layer capacitors, having an equal electrostatic capacity, and that is configured such that adjacent electric double layer capacitors can be connected either in series or in parallel by a switch and the 2n-th electric double layer capacitor and the first electric double layer capacitor can be connected in parallel by a switch, the discharge control method comprising:

wherein where two electric double layer capacitors connected in parallel are defined as a parallel section, first processing and second processing are repeated until the state is changed from a state in which a number P of parallel sections is n to a state in which all of the electric double layer capacitors are connected in series, and a voltage of the electric storage means reaches a preset second voltage value,
the first processing includes:
when the number P of parallel sections is 1 or greater, i is an integer whose value cycles from 1 to 2n, each value for kj (j is an integer that satisfies 1≦j ≦P) is 0 or an even number satisfying 0≦kj≦2n−2, and while a value corresponding to i is increased by one every time a predetermined period of time passes, a connection state of an (i+kj)th capacitor and an (i+kj+1)th capacitor is switched to a parallel connection state so as to constitute the parallel section, and at the same time connection states of the other electric double layer capacitors are caused to be in a series connection state, where when K is an integer, a (2n+K)th electric double layer capacitor is a Kth electric double layer capacitor, and
the second processing includes:
when the voltage of the electric storage means reaches the second voltage value, the number P of parallel sections is decreased by one.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/749,993Filed 25 Jan 2013 · continuation
Priority: 27 Jul 2010
Published: US 2013/0200860 A18 Aug 2013
Granted: 12 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02J 7/00
Circuit arrangements for charging or discharging batteries or for supplying loads from
H02J 7/34
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: parallel operation in networks using both…
H02J 7/575
Acting upon multiple batteries simultaneously or sequentially: parallel/serial switching of connection of batteries to charge or load circuit
H02M 3/07
Using resistors or capacitors, e.g. potential divider: using capacitors charged and discharged alternately by semiconductor devices with control…