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Power supply system and motor carPower supply system and motor car description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080067972, Power supply system and motor car. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2006-251604, filed Sep. 15, 2006, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002]1. Field of the Invention [0003]The present invention relates to a power supply system provided with a nonaqueous electrolyte battery and a motor car provided with the power supply system. [0004]2. Description of the Related Art [0005]In recent years, vigorous research is being conducted on, for example, a hybrid vehicle, 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. Some of them have been in practical use. Also, secondary batteries have been studied as a backup power supply in case of emergency such as a power failure. Batteries that have been in practical use and mounted include a lead-acid storage battery and a nickel-hydrogen secondary battery. [0006]However, for example, nickel-hydrogen secondary batteries used for hybrid vehicles have a problem that batteries suddenly produce heat during high power output or fast charging by regenerative energy, and also degradation by heat is severe. Also, lead-acid storage batteries used as an emergency power supply are subject to restrictions of installation locations because they are heavy due to small weight energy density. [0007]On the other hand, hybrid vehicles using large-capacity capacitors have also been under development. However, while the capacitors can instantaneously store large electric power compared with the secondary batteries, there is a problem that the capacitors have a very small electric capacity and thus cannot be miniaturized. [0008]In addition, for electric vehicles, a power supply system that can efficiently recover regenerative energy when a brake is applied has not yet been developed and thus, large-capacity batteries must be mounted. [0009]Under such circumstances, high-power lithium-ion batteries have been developed to overcome the above problems. Lithium-ion batteries with high voltage and light weight have high energy density, but with the use of a carbonaceous material for a negative electrode, there is a problem of cycle life degradation caused, for example, by fast charging during energy regeneration or the like. Consequently, input power into the lithium-ion batteries must be limited and regenerative energy cannot be stored efficiently. Moreover, if output power of the lithium-ion batteries is made higher, discharge capacity will be decreased, making a travel distance of, for example, an electric vehicle (EV) or hybrid vehicle shorter. Also, for plug-in hybrid vehicles, making the travel distance by motor driving (EV running) longer will be demanded in addition to improvement of energy regeneration performance when a brake is applied and accelerating performance. However, it is difficult to have both improvement of energy regeneration performance and accelerating performance and improvement of traveling performance by motor driving (EV running) at the same time. [0010]JP-A 2000-348725 (KOKAI) discloses that if carbon or lithium-titanium oxide is used as a negative electrode material, the potential changes little when the negative electrode is charged and thus an end point of charging must be determined by the positive electrode potential. As a result, fast charging performance will be deteriorated. Therefore, in JP-A 2000-348725 (KOKAI), an attempt is made to control the end point of charging through the negative electrode potential by forming a negative electrode active material from a carbonaceous material and a material (for example, lithium-titanium oxide) whose potential in a plateau area is higher than that of the carbonaceous material. In the plateau area, the potential does not change even if lithium is taken in. [0011]However, lithium ion absorbing potential of the carbonaceous material is different from that of the lithium-titanium oxide. Therefore, if the carbonaceous material and the lithium-titanium oxide are used together in a cell, lithium ion absorbing/desorbing is unlikely to occur in the carbonaceous material, making it impossible to provide a high discharge capacity. BRIEF SUMMARY OF THE INVENTION [0012]An object of the present invention is to provide a power supply system superior in cycle performance in fast charging and a motor car provided with the power supply system. [0013]According to an aspect of the present invention, there is provided a power supply system comprising: [0014]a first battery module which supplies electric energy to an outside and comprises a first nonaqueous electrolyte battery comprising a positive electrode and a negative electrode containing a carbonaceous material; and [0015]a second battery module which supplies electric energy to the first battery module and comprises a second nonaqueous electrolyte battery comprising a negative electrode containing a negative electrode active material that has a lithium ion absorbing potential of 0.4V (vs.Li/Li.sup.+) or more and an average particle diameter of 1 .mu.m or less, and a positive electrode containing lithium metallic oxide represented by Li.sub.xCo.sub.yM.sub.1-yO.sub.2 (M is at least one element selected from the group consisting of Ni, Mn, Al and Sn, 0.ltoreq.x.ltoreq.1.1, and 0.ltoreq.y<1), and the second battery module is chargeable in a range of 20 to 80% of charging depth so that a charging current density (A/kg) of the second nonaqueous electrolyte battery becomes higher that that of the first nonaqueous electrolyte battery. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING [0016]FIG. 1 is a block diagram showing a power supply system and a motor car according to a first embodiment; [0017]FIG. 2 is an exploded perspective view of a BMU integrated battery module used in the power supply system of FIG. 1; [0018]FIG. 3 is a partially cut-away perspective view schematically showing a flat nonaqueous electrolyte battery used in the battery module of FIG. 2; [0019]FIG. 4 is a block diagram showing a battery control unit in the power supply system of FIG. 1; [0020]FIG. 5 is a partially cut-away perspective view schematically showing another flat nonaqueous electrolyte battery used in the battery module of FIG. 2; Continue reading about Power supply system and motor car... Full patent description for Power supply system and motor car Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Power supply system and motor car patent application. Patent Applications in related categories: 20090278490 - Apparatus and method for the power management of operatively connected batteries respectively on a handheld electronic device and a holder for the handheld electronic device - A handheld electronic device in conjunction with a holder for the handheld electronic device that together form an electronic device. The handheld electronic device includes a first battery and the holder includes a second battery and a charging apparatus. 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