US2008067972A1PendingUtilityA1

Power supply system and motor car

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Assignee: TAKAMI NORIOPriority: Sep 15, 2006Filed: Sep 11, 2007Published: Mar 20, 2008
Est. expirySep 15, 2026(~0.2 yrs left)· nominal 20-yr term from priority
Inventors:Norio TakamiHiroki InagakiYoshinao TatebayashiYasuhiro Harada
H01M 10/441H01M 4/525H01M 4/587H01M 4/485H01M 10/0525H01M 10/4207H01M 4/583H01M 4/505H01M 2220/10H01M 2220/20H01M 50/216H01M 50/209H01M 50/211H01M 50/213Y02E60/10Y02T10/70
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Claims

Abstract

A power supply system includes a first battery module and a second battery module. The first battery module comprises a first nonaqueous electrolyte battery comprising a negative electrode containing a carbonaceous material. The second battery module comprises a second nonaqueous electrolyte battery comprising a negative electrode and a positive electrode. The negative electrode contains a negative electrode active material that has a lithium ion absorbing potential of 0.4V (vs.Li/Li + ) or more and an average particle diameter of 1 μm or less. The positive electrode contains lithium metallic oxide represented by Li x Co y M 1-y O 2 . 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.

Claims

exact text as granted — not AI-modified
1 . A power supply system comprising:
 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   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 + ) or more and an average particle diameter of 1 μm or less, and a positive electrode containing lithium metallic oxide represented by Li x Co y M 1-y O 2  (M is at least one element selected from the group consisting of Ni, Mn, Al and Sn, 0≦x≦1.1, and 0≦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.   
   
   
       2 . The power supply system according to  claim 1 , wherein the y has a value satisfying 0<y<1. 
   
   
       3 . The power supply system according to  claim 1 , wherein in the first nonaqueous electrolyte battery, the carbonaceous material is a graphitized material whose average layer spacing derived from (002) reflection d 002  is 0.337 nm or less, and the positive electrode includes the lithium metallic oxide. 
   
   
       4 . The power supply system according to  claim 1 , wherein the lithium metallic oxide is represented by Li x Co y Ni z Mn 1-y-z O 2  (where 0<x≦1.1, 0.1≦y≦0.6, 0.1≦z≦0.8). 
   
   
       5 . The power supply system according to  claim 1 , wherein in the second nonaqueous electrolyte battery, the negative electrode active material is a lithium-titanium oxide having a spinel structure. 
   
   
       6 . The power supply system according to  claim 1 , further comprising a charge/discharge control circuit common to the first nonaqueous electrolyte battery and the second nonaqueous electrolyte battery. 
   
   
       7 . The power supply system according to  claim 1 , wherein the positive electrode of the second nonaqueous electrolyte battery includes a second lithium metallic oxide being at least one selected from the group consisting of a lithium-manganese complex oxide having a spinel structure, a lithium-manganese-nickel complex oxide having a spinel structure and a lithium metal phosphate having an olivine structure. 
   
   
       8 . The power supply system according to  claim 1 , wherein the charging depth of the second battery module is 40 to 60%. 
   
   
       9 . The power supply system according to  claim 1 , wherein a charging depth of the first battery module is 40 to 100%. 
   
   
       10 . The power supply system according to  claim 1 , wherein in the first nonaqueous electrolyte battery, the carbonaceous material is a graphitized material whose average layer spacing derived from (002) reflection d 002  is 0.337 nm or less, and the positive electrode includes the lithium metallic oxide, and in the second nonaqueous electrolyte battery, the negative electrode active material is a lithium-titanium oxide having a spinel structure. 
   
   
       11 . A motor car comprising the power supply system according to  claim 1 .

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