Non-aqueous secondary battery and its control method
First Claim
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1. A lithium ion battery comprising:
- at least one positive electrode;
at least one negative electrode made of a material capable of being doped or undoped with lithium;
a polyolefin separator, wherein the unit weight of the separator is not less than 5 g/m2 and not more than 30 g/m2;
a liquid or gel electrolyte containing lithium salt and an organic solvent; and
only one battery case in which said at least one positive electrode, said at least one negative electrode and the electrolyte are stored, wherein a material for the battery case is iron, stainless steel, or aluminum, and wherein a wall thickness of the battery case is not less than 0.2 mm and not more than 1 mm,the battery being at least 30 Wh in energy capacity and at least 180 Wh/l in volume energy density, formed by a single cell covered by the battery case, and having a flat shape with a thickness of less than 10 mm and not less than 2 mm, such that heat produced in the battery is releasable via the front and back flat faces of the battery, wherein the battery case houses only one cell,wherein a positive terminal to which said at least one positive electrode is connected and a negative terminal to which said at least one negative electrode is connected are mounted on a flat face of the battery case while being insulated from the battery case.
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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.
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Citations
12 Claims
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1. A lithium ion battery comprising:
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at least one positive electrode; at least one negative electrode made of a material capable of being doped or undoped with lithium; a polyolefin separator, wherein the unit weight of the separator is not less than 5 g/m2 and not more than 30 g/m2; a liquid or gel electrolyte containing lithium salt and an organic solvent; and only one battery case in which said at least one positive electrode, said at least one negative electrode and the electrolyte are stored, wherein a material for the battery case is iron, stainless steel, or aluminum, and wherein a wall thickness of the battery case is not less than 0.2 mm and not more than 1 mm, the battery being at least 30 Wh in energy capacity and at least 180 Wh/l in volume energy density, formed by a single cell covered by the battery case, and having a flat shape with a thickness of less than 10 mm and not less than 2 mm, such that heat produced in the battery is releasable via the front and back flat faces of the battery, wherein the battery case houses only one cell, wherein a positive terminal to which said at least one positive electrode is connected and a negative terminal to which said at least one negative electrode is connected are mounted on a flat face of the battery case while being insulated from the battery case. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lithium ion battery comprising:
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at least one positive electrode; at least one negative electrode made of a material capable of being doped or undoped with lithium; a polyolefin separator, wherein the unit weight of the separator is not less than 5 g/m2 and not more than 30 g/m2; a liquid or gel electrolyte containing lithium salt and an organic solvent; and only one battery case in which said at least one positive electrode, said at least one negative electrode and the electrolyte are stored, wherein a material for the battery case is iron, stainless steel, or aluminum, and wherein a wall thickness of the battery case is not less than 0.2 mmm and not more than 1 mm, wherein the battery case has a flat shape with a thickness of less than 12 mm and not less than 2 mm, such that heat produced in the battery is releasable via the front and back flat faces of the battery case, wherein during battery operation, sufficient heat is releasable via the front and back flat faces of the battery case to achieve proper battery function, wherein the battery has at least 30 Wh in energy capacity and at least 180 Wh/1 in volume energy density, formed by a single cell covered by the battery case, wherein the battery case houses only the single cell, and wherein a positive terminal to which said at least one positive electrode is connected and a negative terminal to which said at least one negative electrode is connected are mounted on a flat face of the battery case while being insulated from the battery case. - View Dependent Claims (9, 10, 11, 12)
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Specification