Laminate cell, assembled battery, battery module and electric vehicle

1. A laminate cell, comprising:

a power generating element formed by sequentially stacking positive electrode plates and negative electrode plates while interposing separators therebetween;

a cell package formed of a metal composite film, the cell package hermetically sealing the power generating element and an electrolyte;

a positive tab connected to the positive electrode plates; and

a negative tab connected to the negative electrode plates,

wherein the power generating element and the cell package have approximately rectangular plane shapes,

the positive tab and the negative tab are drawn outward from end edges of long sides of the cell package,

the positive tab and the negative tab have approximately rectangular plane shapes, and long side lengths of the positive tab and the negative tab are longer than a short side length of the cell package and are shorter than a long side length of the cell package, and

opening holes are provided in portions of the positive tab and negative tab which, are overlapped with the end edges of the long sides of the cell package.

2. An assembled battery, comprising:

a laminate cell according to claim 1 ,

wherein the assembled battery is formed by interconnecting any of a plurality of the laminate cells and a plurality of laminate cell groups electrically in series, each of the laminate cell group being formed by interconnecting a plurality of the laminate cells electrically in parallel.

3. A battery module, comprising:

an assembled battery according to claim 2 ,

wherein the battery module is formed by electrically interconnecting a plurality of the assembled batteries and housing the plurality of electrically interconnected assembled batteries in a module case.

4. An electric vehicle, comprising:

a battery module according to claim 3 ,

wherein the battery module is used as a power source for a driving motor driving drive wheels.

5. A laminate cell, comprising:

a cell package formed of a metal composite film;

a power generating element formed by sequentially stacking positive electrode plates and negative electrode plates while interposing separators therebetween, the power generating element and an electrolyte being hermetically sealed in a space formed by the cell package;

a positive tab connected to the positive electrode plates; and

a negative tab connected to the negative electrode plates,

wherein the power generating element, the cell package, the positive and negative tabs have approximately rectangular plane shapes,

the positive and negative tabs are drawn outward from end edges of long sides of the cell package, and

long side lengths of the positive and negative tabs are longer than a short side length of the power generating element and are shorter than a long side length of the power generating element, and are substantially the same both inside and outside of the space of the cell package.

6. A laminate cell according to claim 5 ,

wherein opening holes are provided in portions of the positive tab and negative tab, which are overlapped with the end edges of the long sides of the cell package.

7. An assembled battery, comprising:

a laminate cell according to claim 5 ,

wherein the assembled battery is formed by interconnecting any of a plurality of the laminate cells and a plurality of laminate cell groups electrically in series, each of the laminate cell group being formed by interconnecting a plurality of the laminate cells electrically in parallel.

8. A battery module, comprising;

an assembled battery according to claim 7 ,

wherein the battery module is formed by electrically interconnecting a plurality of the assembled batteries and housing the plurality of electrically interconnected assembled batteries in a module case.

9. An electric vehicle, comprising:

a battery module according to claim 8 ,

wherein the battery module is used as a power source for a driving motor driving drive wheels.

10. A laminate cell, comprising:

a cell package formed of a metal composite film;

a power generating element formed by sequentially stacking positive electrode plates and negative electrode plates while interposing separators therebetween, the power generating element and an electrolyte being hermetically sealed in a space formed by the cell package;

a positive tab connected to the positive electrode plates through positive leads; and

a negative tab connected to the negative electrode plates through negative leads,

wherein the power generating element, the cell package, the positive and negative tabs, and the positive and negative leads have approximately rectangular plane shapes,

the positive and negative tabs are drawn outward from end edges of long sides of the cell package, and

long side lengths of the positive and negative tabs are longer than long side lengths of the positive and negative leads and are shorter than a long side length of the power generating element, and are substantially the same both inside and outside of the space of the cell package.

11. A laminate cell according to claim 10 ,

wherein opening holes are provided in portions of the positive tab and negative tab, which are overlapped with the end edges of the long sides of the cell package.

12. An assembled battery, comprising:

a laminate cell according to claim 10 ,

wherein the assembled battery is formed by interconnecting any of a plurality of the laminate cells and a plurality of laminate cell groups electrically in series, each of the laminate cell group being formed by interconnecting a plurality of the laminate cells electrically in parallel.

13. A battery module, comprising;

an assembled battery according to claim 12 ,

wherein the battery module is formed by electrically interconnecting a plurality of the assembled batteries and housing the plurality of electrically interconnected assembled batteries in a module case.

14. An electric vehicle, comprising:

a battery module according to claim 13 ,

wherein the battery module is used as a power source for a driving motor driving drive wheels.