Patent ID: 11870102
Assignee: SHENZHEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. An energy storage device, comprising a jelly roll assembly and a connector, wherein the jelly roll assembly comprises at least one jelly roll, each of the at least one jelly roll is formed by winding an electrode sheet, the electrode sheet comprises a plurality of tabs, the plurality of tabs are arranged in a thickness direction of the tabs after winding the electrode sheet;
after the winding, the jelly roll has a first side surface and a first end surface connected with the first side surface, the plurality of tabs are bent at roots of the plurality of tabs and attached to the first end surface, and the plurality of tabs have a connection surface away from the first end surface;
the connector is disposed on the connection surface and connected with the plurality of tabs;
the jelly roll assembly further comprises a first insulation patch, wherein the first insulation patch adheres to and covers a surface of the connector away from the first end surface, and is bent and extends to the first side surface;
under full charge/full discharge cycle at 1 current (C) and 25° C., when a discharge capacity of the energy storage device in which the first insulation patch is attached is attenuated to 90% of a rated capacity of the energy storage device, a cycle number of the energy storage device is equal to or larger than 500, and when the discharge capacity of the energy storage device is attenuated to 80% of the rated capacity, the cycle number of the energy storage device is equal to or larger than 1200;
the at least one jelly roll further has a second side surface opposite the first side surface;
the plurality of tabs have an attachment surface close to the first end surface, the jelly roll assembly further comprises a second insulation patch, wherein the second insulation patch adheres to and covers the attachment surface and extends to the first end surface and the second side surface;
the at least one jelly roll further has a third side surface, a fourth side surface opposite the third side surface, and a second end surface opposite the first end surface, wherein the first end surface is connected with one side of the first side surface, one side of the second side surface, one side of the third side surface, and one side of the fourth side surface, and the second end surface is connected with the other side of the first side surface, the other side of the second side surface, the other side of the third side surface, and the other side of the fourth side surface; the first side surface and the second side surface each have a greater area than the third side surface, the fourth side surface, the first end surface, and the second end surface; the jelly roll assembly further comprises bundling insulation patches disposed on the third side surface, the fourth side surface, and the second end surface, wherein when the at least one jelly roll abuts against one another at one of the second side surface or the first side surface, two ends of each of the bundling insulation patches respectively extend to the other one of the first side surface or the second side surface of the at least one jelly roll that is exposed; under full charge/full discharge cycle at 1 C and 25° C., when the discharge capacity of the energy storage device in which the bundling insulation patches and the first insulation patch are attached is attenuated to 90% of the rated capacity, the cycle number of the energy storage device is equal to or larger than 900 and when the discharge capacity of the energy storage device is attenuated to 80% of the rated capacity, the cycle number of the energy storage device is equal to or larger than 1500;
a ratio of a tensile force that the bundling insulation patches are able to withstand to an adhering area of the bundling insulation patches on the at least one jelly roll is greater than an expansion-force pressure of the at least one jelly roll, wherein the expansion-force pressure of the at least one jelly roll is less than or equal to 0.4 MPa;
the electrode sheet comprises a first electrode sheet and a second electrode sheet, wherein each of the at least one jelly roll is formed by winding the first electrode sheet and the second electrode sheet, the first electrode sheet comprises a plurality of first tabs, the second electrode sheet comprises a plurality of second tabs, the plurality of first tabs are arranged in a thickness direction of the plurality of first tabs after the winding, and the plurality of second tabs are arranged in a thickness direction of the plurality of second tabs after the winding, and a polarity of the plurality of first tabs is opposite to a polarity of the plurality of second tabs;
the connector comprises a first connector and a second connector;
the plurality of first tabs have a first connection surface away from the first end surface, wherein the first connector is disposed on the first connection surface and is connected with the plurality of first tabs; the plurality of second tabs have a second connection surface away from the first end surface, wherein the second connector is disposed on the second connection surface and is connected with the plurality of second tabs;
the first insulation patch comprises a first insulation sub-patch and a second insulation sub-patch, wherein the first insulation sub-patch adheres to and covers a surface of the first connector away from the first end surface and extends to the first side surface, and the second insulation sub-patch adheres to and covers a surface of the second connector away from the first end surface and extends to the first side surface;
the first insulation sub-patch comprises a first connection sub-portion and a second connection sub-portion connected with the first connection sub-portion, wherein the first connection sub-portion adheres to an upper side of the first end surface, and the second connection sub-portion is bent downwards relative to the first connection sub-portion and adheres to the first side surface; the second insulation sub-patch comprises a third connection sub-portion and a fourth connection sub-portion connected with the third connection sub-portion, wherein the third connection sub-portion adheres to the upper side of the first end surface, and the fourth connection sub-portion is bent downwards relative to the third connection sub-portion and adheres to the first side surface; and
the first insulation sub-patch has an elongation at break of 120%-140% at a bending connection region between the first connection sub-portion and the second connection sub-portion when subject to an expansion force of the at least one jelly roll, and the second insulation sub-patch has an elongation at break of 120%-140% at a bending connection region between the third connection sub-portion and the fourth connection sub-portion when subject to the expansion force of the at least one jelly roll.