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Storage battery system and automobile

a storage battery and battery technology, applied in the field of storage batteries, can solve the problems of battery incurring very large thermal deterioration, battery swelling, and unsolved problems, and achieve the effect of suppressing battery swelling

Inactive Publication Date: 2006-03-30
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a storage battery system and an automobile that can prevent the battery from swelling during rapid charging under high temperature conditions. The system includes a battery module with nonaqueous electrolyte secondary batteries that have a negative electrode layer with lithium-titanium composite oxide particles. The system also includes a temperature sensor, a voltmeter, and a charge control unit that controls the maximum end-of-charge voltage of the batteries to prevent damage. The technical effect of this invention is to improve the safety and reliability of the battery system in high-temperature environments.

Problems solved by technology

However, the nickel-hydrogen battery used in, for example, a hybrid automobile, gives rise to the problem that heat is generated rapidly during the high output stage or in the rapid charging (regenerative) stage.
In addition, the battery incurs very large thermal deterioration.
However, a serious problem remains unsolved in the lithium ion battery in that the battery is swollen so as to be deformed under a high temperature environment in, for example, the summer season.

Method used

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  • Storage battery system and automobile
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Examples

Experimental program
Comparison scheme
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first embodiment

[0036] The present inventors have continued further research with attention paid to the situation that the battery module is swollen if the charging depth is increased under high temperatures in applying regenerative charging to the battery module of a nonaqueous electrolyte secondary battery comprising a negative electrode including a lithium-titanium composite oxide as the negative electrode active material. The present inventors find that the reducing decomposition potential of the nonaqueous solvent contained in the nonaqueous electrolyte is shifted toward the nobler side simultaneously with the shifting of the lithium absorbing potential of the lithium-titanium composite oxide toward the baser side. As a result, the potential difference between the reducing decomposition potential and the lithium absorbing potential is made small. It has been found that the potential difference that has been made small causes the reaction between the nonaqueous solvent and the lithium-titanium ...

second embodiment

[0117] The storage battery system according to the first embodiment of the present invention can be suitably used not only in the case of charging the battery by the regenerative power but also in the case of rapidly charging the battery under a high temperature environment no lower than 45° C. The particular situation of the rapid charging under a high temperature environment includes, for example, a power supply device for a digital camera, a power supply device for a lightweight vehicle such as an assist bicycle, a back-up power supply device for a personal computer and a factory (UPS: Uninterruptible Power Supply device), and a cleaning machine.

[0118] It is possible for the storage battery system according to the second embodiment of the present invention to be substantially equal to the storage battery system according to the first embodiment of the present invention described above, except that a regenerative power is not used for charging the storage battery according to the...

example 1

[0136] The manufacturing method of the negative electrode will now be described first. Specifically, a slurry was prepared first by dispersing lithium titanate (Li4Ti5O12) used as a negative electrode active material and having an average particle diameter of 0.3 μm, a carbon powder used as an electrically conductive agent and having an average particle diameter of 0.4 μm, and polyvinylidene fluoride (PVdF) used as a binder, which were mixed in a weight ratio of 90:7:3, in a n-methyl pyrrolidone (NMP) solvent, followed by coating an aluminum alloy foil (purity of 99.4%) having a thickness of 12 μm and an average crystal grain size of 50 μm with the resultant slurry and subsequently drying and pressing the aluminum alloy foil coated with the slurry so as to manufacture a negative electrode having an electrode density of 2.4 g / cm3. Incidentally, the negative electrode current collector was manufactured by annealing at 200° C. an aluminum alloy foil (purity of 99.4%) having a thickness...

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Abstract

A storage battery system includes a battery module including nonaqueous electrolyte secondary batteries. The storage battery system further includes a temperature sensor which measures a temperature of the battery module, a voltmeter which measures a voltage of each of the nonaqueous electrolyte secondary batteries and a charge control unit which controls a maximum end-of-charge voltage V1 (V) of the nonaqueous electrolyte secondary batteries to fall within the range defined in formula (1) given below when the temperature of the battery module is not lower than 45° C. and is not higher than 90° C.: 0.85×V0≦V1≦0.96×V0   (1)

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefit of priority from prior Japanese Patent Applications No. 2004-278242, filed Sep. 24, 2004; and No. 2005-232368, filed Aug. 10, 2005, the entire contents of both of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a storage battery suitable for a regenerative charging system used in, for example, an automobile, a motorcycle, an electric tram, an elevator or a windpower station. [0004] 2. Description of the Related Art [0005] In recent years, vigorous research is being conducted on, for example, a hybrid automobile, a motorcycle, an electric tram, an elevator and a windpower plant each having a battery mounted therein in order to utilize effectively the energy, and to utilize effectively the regenerative energy in view of the preservation of the earth's environment. As a matter of fact, a lea...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/50H01M4/66H02J7/00H01M4/52H01M4/50B60L50/16H01M4/02H01M4/485H01M4/505H01M4/525H01M10/05H01M10/052H01M10/0569H01M10/44
CPCB60L3/0046Y02T90/121B60L11/185B60L11/1862H01M4/131H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/661H01M10/052H01M10/4207H01M10/44H01M10/448H01M10/5004H01M10/5016H01M10/5018H01M10/5067H01M10/5081H01M2004/021Y02E60/122Y02T10/7005Y02T10/7011Y02T10/7044Y02T10/705Y02T90/128Y02T90/14B60L2200/26B60L7/14H01M10/625H01M10/657H01M10/6563H01M10/627H01M10/613Y02T10/7072B60L53/11B60L58/13B60L58/18B60L58/26Y02E60/10Y02T10/70B60L50/50B60L50/16Y02T90/12
Inventor TAKAMI, NORIOINAGAKI, HIROKITATEBAYASHI, YOSHINAOSATO, YUJI
Owner KK TOSHIBA
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