WOUND-TYPE CELL
The present disclosure provides a wound-type cell which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate is positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction; a separator; a first electrode tab; and a second electrode tab. A third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.
The present application claims priority to Chinese patent application No. 201610196793.8, filed on Mar. 31, 2016, which is incorporated herein by reference in its entirety.
FIELD OF THE PRESENT DISCLOSUREThe present disclosure relates to the field of battery, and particularly relates to a wound-type cell.
BACKGROUND OF THE PRESENT DISCLOSUREWith the commercial development of Lithium-ion cell, the requirement of market on energy density and mechanical abuse performance of the Lithium-ion cell is becoming higher and higher. Referring to
In view of the problem existing in the background, an object of the present disclosure is to provide a wound-type cell, which can reduce a usage amount of a separator and a thickness of the wound-type cell, and improve the energy density of the wound-type cell.
In order to achieve the above object, the present disclosure provides a wound-type cell which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate is positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction; a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate; a first electrode tab electrically connected to the first current collector; and a second electrode tab electrically connected to the second current collector. A third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.
The present disclosure has the following beneficial effects: in the wound-type cell according to the present disclosure, because the third winding start end of the separator extends along the direction away from the second end of the second winding start end and is not folded back, there is no need to wind back the separator in large length as in the prior art, thereby reducing a usage amount of the separator and the cost of the separator. In addition, the way that the third winding start end of the separator extends can avoid the third winding start end overlapping with the second winding start end in the thickness direction, thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell. At the same time, it is easy to realize automatic production of the wound-type cell of the present disclosure.
Reference numerals are represented as follows:
- 1 first electrode plate
11 first current collector
-
- 111 blank first current collector
12 first active material layer
13 first groove
- 2 second electrode plate
21 second current collector
-
- 211 blank second current collector
22 second active material layer
23 second groove
- 3 separator
- 4 first electrode tab
- 5 second electrode tab
- E1 first winding start end
- E11 first end
- E2 second winding start end
E21 second end
- E3 third winding start end
- C arc-shaped portion
- S1 first winding mandrel
S11 first end surface
S12 first side surface
- S2 second winding mandrel
S21 second end surface
S22 second side surface
- G clamping groove
- L length direction
- T thickness direction
Hereinafter a wound-type cell and a winding mandrel according to the present disclosure will be described in detail in combination with the figures.
Firstly, a wound-type cell according to a first aspect of the present disclosure will be described.
Referring to
In the wound-type cell according to the present disclosure, because the third winding start end E3 of the separator 3 extends along the direction away from the second end E21 of the second winding start end E2 and is not folded back, there is no need to wind back the separator 3 in large length as in the prior art, thereby reducing a usage amount of the separator 3 and the cost of the separator 3. In addition, the way that the third winding start end E3 of the separator 3 extends can avoid the third winding start end E3 overlapping with the second winding start end E2 in the thickness direction T, thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell. At the same time, it is easy to realize automatic production of the wound-type cell of the present disclosure.
In an embodiment of a wound-type cell according to the present disclosure, a length of the third winding start end E3 of the separator 3 is between 1 mm and 10 mm, preferably, the length of the third winding start end E3 of the separator 3 is between 1 mm and 5 mm.
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, the first electrode plate 1 may be a positive electrode plate or a negative electrode plate, correspondingly, the second electrode plate 2 may be a negative electrode plate or a positive electrode plate. Preferably, the first electrode plate 1 is a positive electrode plate and the second electrode plate 2 is a negative electrode plate, correspondingly, the first active material layer 12 is a positive active material layer, and specifically, the first active material layer 12 may be selected from at least one of lithium cobalt oxide (LiCoO2), lithium ferric phosphate (LiFePO4) and lithium manganese oxide (LiMn2O4). The second active material layer 22 is a negative active material layer, and specifically, the second active material layer 22 may be selected from at least one of carbon and silicon.
In an embodiment of the wound-type cell according to the present disclosure, the first electrode tab 4 is provided as one or more in number (referring to
In an embodiment of the wound-type cell according to the present disclosure, the second electrode tab 5 is provided as one or more in number (referring to
In an embodiment of the wound-type cell according to the present disclosure, the first current collector 11 is an aluminum foil, the second current collector 21 is a copper foil.
In an embodiment of the wound-type cell according to the present disclosure, a thickness of the first electrode tab 4 is more than a thickness of the first current collector 11. This can ensure a connection strength and an overcurrent sectional area of the first electrode tab 4.
In an embodiment of the wound-type cell according to the present disclosure, a thickness of second electrode tab 5 is more than a thickness of the second current collector 21. This can ensure a connection strength and an overcurrent sectional area of the second electrode tab 5.
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, the first electrode tab 4 and the first current collector 11 are integrally formed. For example, referring to
In an embodiment of the wound-type cell according to the present disclosure, the second electrode tab 5 and the second current collector 21 are integrally formed. For example, referring to
In an embodiment of the wound-type cell according to the present disclosure, the first electrode tab 4 is formed separately and welded to the corresponding blank first current collector 111.
In an embodiment of the wound-type cell according to the present disclosure, the second electrode tab 5 is formed separately and welded to the corresponding blank second current collector 211.
In an embodiment of the wound-type cell according to the present disclosure, the welding is laser welding, ultrasonic welding or resistance welding.
The forming mode of the first electrode tab 4 preferably uses the integrally forming mode. The forming mode of the second electrode tab 5 preferably uses the integrally forming mode.
Secondly, a winding mandrel according to a second aspect of the present disclosure will be described.
Referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
In an embodiment of the wound-type cell according to the present disclosure, referring to
Claims
1.-11. (canceled)
12. A wound-type cell, comprising:
- a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector;
- a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate being positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction;
- a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate;
- a first electrode tab electrically connected to the first current collector; and
- a second electrode tab electrically connected to the second current collector;
- wherein
- a third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.
13. The wound-type cell according to claim 12, wherein a length of the third winding start end of the separator is between 1 mm and 5 mm.
14. The wound-type cell according to claim 12, wherein the first electrode plate is a positive electrode plate; the second electrode plate is a negative electrode plate.
15. The wound-type cell according to claim 12, wherein the first electrode tab is provided as one or more in number; the second electrode tab is provided as one or more in number.
16. The wound-type cell according to claim 12, wherein
- the first electrode plate has a blank first current collector which is positioned at the first winding start end and is not coated with the first active material layer;
- the second electrode plate has a blank second current collector which is positioned at the second winding start end and is not coated with the second active material layer.
17. The wound-type cell according to claim 12, wherein
- a side of the second current collector which directly faces the blank first current collector is not coated with the second active material layer;
- a side of the first current collector which directly faces the blank second current collector is not coated with the first active material layer.
18. The wound-type cell according to claim 12, wherein an inner side of an arc-shaped portion of the second current collector which directly faces a first end of the first winding start end is not coated with the second active material layer.
19. The wound-type cell according to claim 16, wherein
- the first end of the first winding start end is beyond the second end of the second winding start end in the length direction and a position of the first electrode tab is beyond the second end of the second winding start end in the length direction; or
- the second end of the second winding start end is beyond the first end of the first winding start end in the length direction and a position of the second electrode tab is beyond the first end of the first winding start end in the length direction.
20. The wound-type cell according to claim 12, wherein
- the first electrode plate further has a first groove, a bottom of the first groove is a blank first current collector which is exposed and a peripheral side of the first groove is the first active material layer;
- the second electrode plate further has a second groove, a bottom of the second groove is a blank second current collector and a peripheral side of the second groove is the second active material layer.
21. The wound-type cell according to claim 16, wherein
- the first electrode tab and the first current collector are integrally formed, or the first electrode tab is formed separately and welded to the corresponding blank first current collector;
- the second electrode tab and the second current collector are integrally formed, or the second electrode tab is formed separately and welded to the corresponding blank second current collector.
22. The wound-type cell according to claim 20, wherein
- the first electrode tab and the first current collector are integrally formed, or the first electrode tab is formed separately and welded to the corresponding blank first current collector;
- the second electrode tab and the second current collector are integrally formed, or the second electrode tab is formed separately and welded to the corresponding blank second current collector.
Type: Application
Filed: Mar 13, 2017
Publication Date: Oct 5, 2017
Inventors: QIAO ZENG (Ningde), Jiacai CAI (Ningde), Kefei WANG (Ningde), Yu LUO (Ningde)
Application Number: 15/457,775