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A liquid lead storage battery includes a negative electrode plate, a positive electrode plate and an electrolyte solution. The both plates are arranged so as to face each other in a thickness direction and immersed in the electrolyte solution. The negative electrode plate includes an active material

A liquid lead storage battery includes a negative electrode plate, a positive electrode plate and an electrolyte solution. The both plates are arranged so as to face each other in a thickness direction and immersed in the electrolyte solution. The negative electrode plate includes an active material containing carbon. An elastic sheet formed of a porous material is arranged between the negative electrode plate and the positive electrode plate so as to press the negative electrode plate from both sides in the thickness direction.

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1. A liquid lead storage battery comprising a negative electrode plate, a positive electrode plate and an electrolyte solution, the both plates being arranged so as to face each other in a thickness direction and immersed in the electrolyte solution, wherein the negative electrode plate includes an

1. A liquid lead storage battery comprising a negative electrode plate, a positive electrode plate and an electrolyte solution, the both plates being arranged so as to face each other in a thickness direction and immersed in the electrolyte solution, wherein the negative electrode plate includes an active material containing carbon,a first microporous thin film separator is in direct contact with the positive electrode plate and arranged between the negative electrode plate and the positive electrode plate,a first porous elastic sheet is in direct contact with the first microporous thin film separator and a first surface of the negative electrode plate, and arranged between the negative electrode plate and the positive electrode plate so as to press the negative electrode plate from both sides in the thickness direction,a second porous elastic sheet is in direct contact with a second surface of the negative electrode plate, the second surface of the negative electrode plate being in parallel to the first surface of the negative electrode plate,a second microporous thin film separator is in direct contact with the second porous elastic sheet, andthe first and second microporous thin film separators are thinner than the first and second elastic sheets and have an average pore diameter smaller than that of the first and second porous elastic sheets. 2. The liquid lead storage battery according to claim 1, wherein the first and second microporous thin film separators comprise polyethylene. 3. The liquid lead storage battery according to claim 1, wherein the first and second porous elastic sheets have a porosity of more than 90% and 95% or less, or an average pore diameter of 100 μm or more. 4. The liquid lead storage battery according to claim 1, wherein the negative active material contains the carbon in an amount of 0.3% by mass or more and less than 10% by mass. 5. The liquid lead storage battery according to claim 1, wherein the liquid lead storage battery further includes a container in which the negative electrode plate and the positive electrode plate are stored and the electrolyte solution is retained, anda gap is formed between any one of the upper parts, side faces and bottom faces of the negative electrode plate and the positive electrode plate, and the container. 6. The liquid lead storage battery according to claim 1, wherein the first and second microporous thin film separators are bag-shaped, andthe negative electrode plate is stored in the bag-shaped first and second microporous thin film separators. 7. The liquid lead storage battery according to claim 1, wherein the first microporous thin film separator is connected to the second microporous thin film separator. 8. The liquid lead storage battery according to claim 1, wherein the first and second microporous thin film separators are made of a single sheet. 9. A liquid lead storage battery comprising a negative electrode plate, a positive electrode plate and an electrolyte solution, the both plates being arranged so as to face each other in a thickness direction and immersed in the electrolyte solution, wherein the negative electrode plate includes an active material containing carbon,a first and second porous elastic sheets are arranged between the negative electrode plate and the positive electrode plate so as to press the negative electrode plate from both sides in the thickness direction, the first porous elastic sheet being in direct contact with the positive electrode plate, the second porous elastic sheet being in direct contact with the negative electrode plate,a microporous thin film separator is arranged between the first and second porous elastic sheets and in direct contact with the first and second porous elastic sheets, andthe microporous thin film separator is thinner than the first and second porous elastic sheets and has an average pore diameter smaller than that of the first and second porous elastic sheets. 10. The liquid lead storage battery according to claim 9, wherein the microporous thin film separator comprises polyethylene. 11. The liquid lead storage battery according to claim 9, wherein the first and second porous elastic sheets have a porosity of more than 90% and 95% or less, or an average pore diameter of 100 μm or more. 12. The liquid lead storage battery according to claim 9, wherein the negative active material contains the carbon in an amount of 0.3% by mass or more and less than 10% by mass. 13. The liquid lead storage battery according to claim 9, wherein the liquid lead storage battery further includes a container in which the negative electrode plate and the positive electrode plate are stored and the electrolyte solution is retained, anda gap is formed between any one of the upper parts, side faces and bottom faces of the negative electrode plate and the positive electrode plate, and the container.