Cell and battery using same
View Patent ↗The present disclosure discloses a cell and a battery using the same. The cell comprises a positive electrode plate and a negative electrode plate which each are provided with an uncoated current collector, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate each are respectively welded with an electrical conductive piece used to connect with an external circuit. The uncoated current collector of the positive electrode plate is punched to form an electrolyte transmission channel and/or the uncoated current collector of the negative electrode plate is punched to form an electrolyte transmission channel; a punching manner of the electrolyte transmission channel comprises following one manner or two manners: one manner is that an edge region of the uncoated current collector which is not aligned with the electrical conductive piece is punched to form an semi-closed channel, the other manner is that the uncoated current collector is punched to form a hole-like all-closed channel. In comparison with the technology in background, by that the uncoated current collector is punched to form the electrolyte transmission channel, electrolyte infiltration speed is improved, at the same time the rate performance and the cycle performance of the battery are promoted.
1. A cell, comprising a positive electrode plate and a negative electrode plate which each are provided with an uncoated current collector, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate each being welded with an electrical conductive piece, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate each being formed with a weld zone at a section thereof welded with the electrical conductive piece;
wherein
at least one of the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate is provided with a hole-like all-closed channel penetrating the uncoated current collector along a thickness direction, and the hole-like all-closed channel is positioned at an inner side of the weld zone along a length direction; and/or,
at least one of the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate is provided with a semi-closed channel penetrating a corner portion of the uncoated current collector along the thickness direction, and the semi-closed channel is positioned at a side of the weld zone along a width direction.
2. The cell according to claim 1 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is a circle, an ellipse, a rectangle, a triangle or a trapezoid.
3. The cell according to claim 1 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is multiple holes arranged side by side.
4. The cell according to claim 1 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is a rectangle and a long side of the rectangle is parallel to the weld zone, or a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is an ellipse and a long axis of the ellipse is parallel to the weld zone.
5. The cell according to claim 1 , wherein the hole-like all-closed channel are formed by punching.
6. The cell according to claim 5 , wherein an area of the hole-like all-closed channel is 2%-10% of an area of the uncoated current collector before the uncoated current collector is punched.
7. The cell according to claim 1 , wherein the cell is a wound-type cell, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate extend along a length direction respectively toward opposite directions.
8. The cell according to claim 1 , wherein a projection of the uncoated current collector of the positive electrode plate onto a plane perpendicular to the thickness direction is a trapezoid and/or a projection of the uncoated current collector of the negative electrode plate onto a plane perpendicular to the thickness direction is a trapezoid.
9. The cell according to claim 1 , wherein a projection of the semi-closed channel onto a plane perpendicular to the thickness direction is an inward concave arc shape.
10. The cell according to claim 1 , wherein the two electrical conductive piece respectively are a positive electrode tab and a negative electrode tab, or the two electrical conductive piece respectively are a positive connecting piece and a negative connecting piece which are connected with a battery top plate.
11. A battery, comprising a battery case, a cell and an electrolyte, the cell and the electrolyte being packaged in the battery case;
the cell comprising a positive electrode plate and a negative electrode plate which each are provided with an uncoated current collector, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate each being welded with an electrical conductive piece, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate each being formed with a weld zone at a section thereof welded with the electrical conductive piece;
wherein
at least one of the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate is provided with a hole-like all-closed channel penetrating the uncoated current collector along a thickness direction, and the hole-like all-closed channel is positioned at an inner side of the weld zone along a length direction; and/or,
at least one of the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate is provided with a semi-closed channel penetrating a corner portion of the uncoated current collector along the thickness direction, and the semi-closed channel is positioned at a side of the weld zone along a width direction.
12. The battery according to claim 11 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is a circle, an ellipse, a rectangle, a triangle or a trapezoid.
13. The battery according to claim 11 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is multiple holes arranged side by side.
14. The battery according to claim 11 , wherein a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is a rectangle and a long side of the rectangle is parallel to the weld zone, or a projection of the hole-like all-closed channel onto a plane perpendicular to the thickness direction is an ellipse and a long axis of the ellipse is parallel to the weld zone.
15. The battery according to claim 11 , wherein the hole-like all-closed channel are formed by punching.
16. The battery according to claim 15 , wherein an area of the hole-like all-closed channel is 2%-10% of an area of the uncoated current collector before the uncoated current collector is punched.
17. The battery according to claim 11 , wherein the cell is a wound-type cell, the uncoated current collector of the positive electrode plate and the uncoated current collector of the negative electrode plate extend along a length direction respectively toward opposite directions.
18. The battery according to claim 11 , wherein a projection of the uncoated current collector of the positive electrode plate onto a plane perpendicular to the thickness direction is a trapezoid and/or a projection of the uncoated current collector of the negative electrode plate onto a plane perpendicular to the thickness direction is a trapezoid.
19. The battery according to claim 11 , wherein a projection of the semi-closed channel onto a plane perpendicular to the thickness direction is an inward concave arc shape.
20. The battery according to claim 11 , wherein the two electrical conductive piece respectively are a positive electrode tab and a negative electrode tab, or the two electrical conductive piece respectively are a positive connecting piece and a negative connecting piece which are connected with a battery top plate.