ACCUMULATOR SYSTEM

• US 20150280285A1
• Filed: 10/29/2013
• Published: 10/01/2015
• Est. Priority Date: 10/30/2012
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Sanyo Electric Company Limited (Panasonic Holdings Corporation), Hoffmann-La Roche Incorporated (Roche Holding AG)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sakatani, Toshihiro, Sugii, Hiromasa, Ochi, Makoto, Kawase, Ryuji, Ogasawara, Etsuko, Sugie, Kazuhiro, Fujita, Kenji
• Application Number:
  US14/432,216
• Publication Number:
  US 20150280285A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60R 16/033 characterised by the use of electrical cells or batteries for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 10/26 Selection of materials as electrolytes
• CPC Class Codes: H01M 10/30 Nickel accumulators H01M10/34 takes precedence
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2300/0014 Alkaline electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

In the storage battery system, from the same temperature and the same voltage as both batteries a decrease per day of an open-circuit voltage of the lead-acid storage battery by a self-discharge is ΔV1(V/day) and a decrease per day of an open-circuit voltage of the sub-battery by a self-discharge is ΔV2(V/day), and a relation of ΔV1≧ΔV2 is satisfied. The sub-battery is a nickel hydride storage battery.

Claims

1. A storage battery system comprising:

a lead-acid storage battery; and

a sub-battery connected to the lead-acid storage battery in parallel,

wherein from the same temperature and the same voltage as both batteries, a decrease per day of an open-circuit voltage of the lead-acid storage battery by a self-discharge is Δ

V1(V/day) and a decrease per day of an open-circuit voltage of the sub-battery by a self-discharge is Δ

V2(V/day), and a relation of Δ

V1≧

Δ

V2 is satisfied.

2. The storage battery system according to claim 1,

wherein the sub-battery is a nickel hydride storage battery.

3. The storage battery system according to claim 2,

wherein in the nickel hydride storage battery, a mass of the at least one type of compound selected from a tungsten compound, a molybdenum compound, and a niobium compound which the electrolyte contains, is 20 mg or more per the electrolyte 1 g, and 50 mg or less per the electrolyte 1 g.

4. The storage battery system according to claim 2,

wherein in the nickel hydride storage battery, sodium hydroxide which the electrolyte contains, is 1.0 mol/L or more, and 4.0 mol/L or less.

5. The storage battery system according to claim 3,

wherein in the nickel hydride storage battery, sodium hydroxide which the electrolyte contains, is 1.0 mol/L or more, and 4.0 mol/L or less.