초록 ▼

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 radi

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.

대표청구항 ▼

1. A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing lithium salt and having a flat shape, wherein when a pressure of 2.5 kg/cm2 is applied to the direction of thickness of the separator, thickness A of the se

1. A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing lithium salt and having a flat shape, wherein when a pressure of 2.5 kg/cm2 is applied to the direction of thickness of the separator, thickness A of the separator is not less than 0.02 mm and not more than 0.15 mm and a porosity of the separator is 40% or higher, andwhen the absolute value of a change rate of the thickness (mm) of the separator relative to the pressure (kg/cm2) applied to the direction of thickness of the separator is defined as B (mm/(kg/cm2)), pressure F which renders B/A=1 is not less than 0.05 kg/cm2 and not more than 1 kg/cm2. 2. The non-aqueous secondary battery according to claim 1, wherein the separator has a first separator and a second separator different from the first separator, the first separator is the separator as recited in claim 1, andthe second separator is a micro-porous film having a thickness of 0.05 mm or less, a pore diameter of 5 μm or less, and a porosity of 25% or more. 3. The non-aqueous secondary battery according to claim 1 or 2, wherein the separator is made of a material comprising at least one of polyethylene or polypropylene as a main component.4. The non-aqueous secondary battery according to claim 1, wherein the separator is made of non-woven fabric.5. The non-aqueous secondary battery according to claim 4, wherein the unit weight of the separator is not less than 5 g/m2 and not more than 30 g/cm2.6. The non-aqueous secondary battery according to claim 2, wherein the first separator is made of non-woven fabric.7. The non-aqueous secondary battery according to claim 6, wherein the unit weight of the first separator is not less than 5 g/m2 and not more than 30 g/m2.8. The non-aqueous secondary battery according to claim 2, wherein the first and second separators are joined together integrally.9. The non-aqueous secondary battery according to claim 2, the material of the first separator is different from that of the second separator.10. The non-aqueous secondary battery according to claim 2, wherein at least one of the first and second separators contain polyethylene.