Non-aqueous secondary battery and its control method

Abstract

The invention provides a non-aqueous secondary battery having positive and negative electrodes and non-aqueous electrolyte containing lithium salt which has an energy capacity of 30 Wh or more, a volume energy density of 180 Wh/l or higher, which battery has a flat shape and is superior in heat radiation characteristic, used safely and particularly preferably used for a energy storage system. The invention also provides a control method of the secondary battery.

1 - 30 . (canceled)  
   
   
       31 . A non-aqueous secondary battery comprising at least one positive electrode and at least one negative electrode and a lithium salt-containing electrolyte, the battery being at lest 30 Wh in energy capacity and at least 180 Wh/l in volume energy density and having a flat shape with a thickness of less than 12 mm and not less than 2 mm.  
   
   
       32 . The non-aqueous secondary battery according to  claim 31 , wherein the positive electrode contains manganese oxide.  
   
   
       33 . The non-aqueous secondary battery according to  claim 31 , wherein the negative electrode comprises as active material double-structure graphite particles formed with graphite-based particles and amorphous carbon layers covering the surface of the graphite-based particles, the graphite-based particles having (d002) spacing of (002) planes of not more than 0.34 nm as measured by X-ray wide-angle diffraction method, the amorphous carbon layers having (d002) spacing of (002) planes of 0.34 nm or higher.  
   
   
       34 . The non-aqueous secondary battery according to  claim 32 , wherein the negative electrode comprises as active material double-structure graphite particles formed with graphite-based particles and amorphous carbon layers covering the surface of the graphite-based particles, the graphite-based particles having (d002) spacing of (002) planes of not more than 0.34 nm as measured by X-ray wide-angle diffraction method, the amorphous carbon layers having (d002) spacing of (002) planes of 0.34 nm or higher.  
   
   
       35 . The non-aqueous secondary battery according to  claim 31 , wherein the negative electrode comprises as active material a carbon material manufactured by mixing at least one of artificial graphite and natural graphite with a carbon material having volatile components on the surface and/or in the inside and baking the mixture.  
   
   
       36 . The non-aqueous secondary battery according to  claim 32 , wherein the negative electrode comprises as active material a carbon material manufactured by mixing at least one of artificial graphite and natural graphite with a carbon material having volatile components on the surface and/or in the inside and baking the mixture.  
   
   
       37 . The non-aqueous secondary battery according to  claim 31 , wherein the front and rear sides of the flat shape are rectangular.  
   
   
       38 . The non-aqueous secondary battery according to  claim 31 , wherein the wall thickness of a battery case of the non-aqueous secondary battery is not less than 0.2 mm and not more than 1 mm.  
   
   
       39 . The non-aqueous secondary battery according to  claim 31 , wherein the wall thickness of a battery case of the non-aqueous secondary battery is not less than 0.2 mm and not more than 0.7 mm.  
   
   
       40 . A secondary-battery control method to be applied to the secondary battery of  claim 31 , comprising the steps of measuring operational parameters at different portions of the battery and controlling operations of the battery based on the results of the measurement.  
   
   
       41 . The secondary-battery control method according to  claim 40 , wherein the operational parameters to be measured include at least one of voltage, tension of current, temperature, dimensions, and internal resistance of the secondary battery.  
   
   
       42 . The secondary-battery control method according to  claim 40 , wherein charge and discharge conditions and resting conditions of the battery, battery temperatures adjusted by heating or cooling, and pressure against the battery case are controlled based on the results of the measurement.