US-12620615-B1 - Wound cell, battery structure, flexible display device, and hot pressing device

US12620615B1US 12620615 B1US12620615 B1US 12620615B1US-12620615-B1

Abstract

The present disclosure relates to the technical field of batteries, and in particular to a wound cell, a battery structure, a flexible display device and a hot pressing device. The wound cell has a first end face and a second end face which are opposite to each other in a winding axis direction, and an outer surface located between the first end face and the second end face. The outer surface comprises four side planes which are sequentially connected end to end, and the joints of at least two adjacent side planes are chamfered. A tab protrudes from at least one of the first end surface and the second end surface, and is capable of being bent to the side planes.

Inventors

Yue Cui
Yuehan WEI
Sitong CHEN
Hong Zhu
Boyang SHI

Assignees

BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20211021
Priority Date: 20201120

Claims (10)

1 . A wound cell, wherein the wound cell has a first end surface and a second end surface opposite to each other in a winding axis direction and an outer peripheral surface disposed between the first end surface and the second end surface, the outer peripheral surface comprises four side planes sequentially connected end to end, and a joint of at least two adjacent side planes is provided at a chamfer, and a tab protrudes from at least one of the first end surface and the second end surface, and the tab is capable of being bent to the side planes, wherein the four side planes comprise a first side plane and a third side plane parallel to a first reference plane, and a second side plane and a fourth side plane parallel to a second reference plane, wherein the first side plane, the second side plane, the third side plane and the fourth side plane are sequentially connected end to end, the first reference plane and the second reference plane are perpendicular to each other and both the first reference plane and the second reference plane are parallel to the winding axis direction, wherein the chamfer is the planar chamfer, a width of an orthographic projection of the planar chamfer on the first reference plane is a first width, a width of a orthographic projection of the planar chamfer on the second reference plane is a second width, and the first width is equal to the second width.
2 . The wound cell according to claim 1 , wherein the first width and the second width are from 0.4 mm to 5 mm.
3 . The wound cell according to claim 1 , wherein the tab is provided with at least two, the at least two tabs comprise a positive tab and a negative tab, the positive tab protrudes from the first end surface and the negative tab protrudes from the second end surface; the positive tab and the negative tab are capable of being bent to an identical side plane or being bent to different side planes respectively; wherein the side plane opposite to the bent positive tab and negative tab is a target side plane, joints of the target side plane and two adjacent side planes are provided at chamfers.
4 . The wound cell according to claim 3 , wherein the positive tab and the negative tab are capable of being bent to the first side plane, and a joint of the first side plane and the second side plane and a joint of the first side plane and the fourth side plane are provided at chamfers.
5 . The wound cell according to claim 4 , wherein a joint of the third side plane and the second side plane and a joint of the third side plane and the fourth side plane are provided at chamfers.
6 . A battery structure, applied to a flexible display device and comprising: at least two wound cells spaced in a horizontal direction, wherein the wound cell is the wound cell according to claim 3 , and the positive tabs and the negative tabs of the wound cells are bent to the target side plane, the horizontal direction is perpendicular to the winding axis direction; at least one first flexible conductive sheet, wherein two ends of the first flexible conductive sheet are connected to the positive tabs of two adjacent wound cells respectively, and a middle portion of the first flexible conductive sheet is capable of being bent; at least one second flexible conductive sheet, wherein two ends of the second flexible conductive sheet are connected to the negative tabs of two adjacent wound cells respectively, and a middle portion of the second flexible conductive sheet is capable of being bent.
7 . The battery structure according to claim 6 , wherein the positive tabs and the negative tabs are bent to the first side plane, the first side plane of each of the wound cells is located in an identical plane.
8 . A flexible display device, comprising the battery structure according to claim 6 .
9 . A hot pressing device for wound cells, comprising a first die and a second die, wherein the first die and the second die are capable of moving relative to each other to enclose a hot pressing cavity for hot pressing wound cells, an inner peripheral surface of the hot pressing cavity matches with the outer peripheral surface of a wound cell, wherein the wound cell has a first end surface and a second end surface opposite to each other in a winding axis direction and an outer peripheral surface disposed between the first end surface and the second end surface, the outer peripheral surface comprises four side planes sequentially connected end to end, and a joint of at least two adjacent side planes is provided at a chamfer, and a tab protrudes from at least one of the first end surface and the second end surface, and the tab is capable of being bent to the side planes, wherein the four side planes comprise a first side plane and a third side plane parallel to a first reference plane, and a second side plane and a fourth side plane parallel to a second reference plane, wherein the first side plane, the second side plane, the third side plane and the fourth side plane are sequentially connected end to end, the first reference plane and the second reference plane are perpendicular to each other and both the first reference plane and the second reference plane are parallel to the winding axis direction, wherein the chamfer is the planar chamfer, a width of an orthographic projection of the planar chamfer on the first reference plane is a first width, a width of a orthographic projection of the planar chamfer on the second reference plane is a second width, and the first width is equal to the second width.
10 . A flexible display device, comprising the battery structure according to claim 7 .

Description

CROSS REFERENCE The present disclosure is a National Stage of International Application No. PCT/CN2021/125422, filed on Oct. 21, 2021, which claims the benefit of priority to Chinese Patent Application No. 202011311794.5, filed on Nov. 20, 2020, both of which are incorporated by reference herein in their entireties for all purposes. TECHNICAL FIELD The present disclosure relates to the field of display technology, specifically, to a wound cell, a battery structure, a flexible display device and a hot pressing device. BACKGROUND With continuous development of flexible cell phones and other electronic products, users have also put forward high requirements for the battery structure in flexible electronic products. For example, the battery structure is required to have certain bending performance and good ionic conductivity. However, the ionic conductivity and bending performance of the current battery structures are difficult to meet the requirements, which affects the product quality. It should be noted that the information disclosed in the background technology section above is only for the purpose of enhancing the understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY The first aspect of the present disclosure provides a wound cell, wherein the wound cell has a first end surface and a second end surface opposite to each other in a winding axis direction and an outer peripheral surface disposed between the first end surface and the second end surface, the outer peripheral surface includes four side planes sequentially connected end to end, and a joint of at least two adjacent side planes is provided at a chamfer, and a tab protrudes from at least one of the first end surface and the second end surface, and the tab is capable of being bent to the side planes. In an exemplary embodiment of the present disclosure, the four side planes include a first side plane and a third side plane parallel to a first reference plane, and a second side plane and a fourth side plane parallel to a second reference plane, wherein the first side plane, the second side plane, the third side plane and the fourth side plane are sequentially connected end to end, the first reference plane and the second reference plane are perpendicular to each other and both the first reference plane and the second reference plane are parallel to the winding axis direction. In an exemplary embodiment of the present disclosure, the chamfer is an arc chamfer or a planar chamfer. In an exemplary embodiment of the present disclosure, the arc chamfer is a circular arc chamfer. In an exemplary embodiment of the present disclosure, the circular arc chamfer has a radius of 0.4 mm to 5 mm. In an exemplary embodiment of the present disclosure, the chamfer is the planar chamfer, a width of an orthographic projection of the planar chamfer on the first reference plane is a first width, a width of a orthographic projection of the planar chamfer on the second reference parallel is a second width, and the first width is equal to the second width. In an exemplary embodiment of the present disclosure, the first width and the second width are from 0.4 mm to 5 mm. In an exemplary embodiment of the present disclosure, the tab is provided with at least two, the at least two tabs include a positive tab and a negative tab, the positive tab protrudes from the first end surface and the negative tab protrudes from the second end surface; the positive tab and the negative tab are capable of being bent to an identical side plane or being bent to different side planes respectively;wherein the side plane opposite to the bent positive tab and negative tab is a target side plane, joints of the target side plane and two adjacent side planes are provided at chamfers. In an exemplary embodiment of the present disclosure, the positive tab and the negative tab are capable of being bent to the first side plane, and a joint of the first side plane and the second side plane and a joint of the first side plane and the fourth side plane are provided at chamfers. In an exemplary embodiment of the present disclosure, a joint of the third side plane and the second side plane and a joint of the third side plane and the fourth side plane are provided at chamfers. The second aspect of the present disclosure provides a battery structure, applied to a flexible display device and including: at least two wound cells spaced in a horizontal direction, wherein the wound cell is any of the wound cells described above, and the positive tabs and the negative tabs of the wound cells are bent to the target side plane, the horizontal direction is perpendicular to the winding axis direction;at least one first flexible conductive sheet, wherein two ends of the first flexible conductive sheet are connected to the positive tabs of two adjacent wound cells respectively, and a middle portion