Charger and charging apparatus

• US 9,293,941 B2
• Filed: 01/25/2011
• Issued: 03/22/2016
• Est. Priority Date: 02/26/2010
• Status: Active Grant

• Current Assignee: Kazuo Fuda, Sachio Takahashi
• Original Assignee: Kazuo Fuda, Sachio Takahashi
• Inventors: Takahashi, Sachio, Fuda, Kazuo
• Primary Examiner(s): Siek, Vuthe
• Assistant Examiner(s): Lin, Aric
• Application Number:
  US13/580,845
• Publication Number:
  US 20130009593A1
• Time in Patent Office: 1,883 Days
• US Class Current: 1/1
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: H02J 7/007194 of the battery

Abstract

A reduction in breakdown voltage and mechanical deterioration of an electrode plate of a rechargeable battery are suppressed, and a charging time is shortened.

There is provided a charger 10 which charges a rechargeable battery, comprising: a first output unit which outputs a first voltage; a second output unit which outputs a second voltage having a predetermined voltage value different from that of the first voltage; a charge control unit 16 which inputs the first voltage and the second voltage, alternately outputs these voltages, and supplies them to the rechargeable battery as charging voltages; a charged-amount detection unit 14 which measures a charged amount of the rechargeable battery; and an output control unit 15 which carries out control in such a manner that an output time of the first voltage and/or the second voltage in the charge control unit 15 is prolonged as the charged amount increases.

Claims

1. A charger which charges a rechargeable battery, comprising:

a first output unit which outputs a first voltage;

a second output unit which outputs a second voltage having a predetermined voltage value higher than that of the first voltage;

a charge control unit which, when charging is started, receives the first voltage and the second voltage, alternately outputs the first or second voltage, and supplies the first or second voltage to the rechargeable battery as charging voltage;

a charged-amount detection unit which measures a charged amount of the rechargeable battery; and

an output control unit which determines an output time of the first voltage based on the charged amount of the rechargeable battery when the first voltage is started to be supplied to the rechargeable battery, and which determines an output time of the second voltage based on the charged amount of the rechargeable battery when the second voltage is started to be supplied to the rechargeable battery,

wherein the output control unit carries out control in such a manner that the output time of the second voltage in the charge control unit is gradually prolonged as the charged amount increases.

2. A charging apparatus which charges a plurality of rechargeable batteries, comprising:

a plurality of chargers, each comprising the charger according to claim 1,

wherein each of the plurality of chargers is connected to each of the plurality of the rechargeable batteries based on a one-on-one correspondence.

3. The charging apparatus according to claim 2, further comprising a plurality of switches between the plurality of rechargeable batteries and the plurality of chargers,

wherein each of the plurality of switches changes over a first path along which the plurality of rechargeable batteries is disconnected from each other and each of the plurality of chargers is connected to each of the plurality of rechargeable batteries and a second path along which each of the plurality of chargers is disconnected from each of the plurality of rechargeable batteries and the plurality of rechargeable batteries is coupled with each other.

4. The charging apparatus according to claim 3, wherein each of the plurality of switches has an electric relay which switches the first path and the second path, and the electric relay has:

a first contact point connected to the first path;

a second contact point connected to the second path;

a connection member which is connected to one of the first contact point and the second contact point;

a gear portion which rotates or rotationally moves to move the connection member; and

a worm portion which rotates or rotationally moves the gear portion.