公开(公告)号：US11901513B2

公开(公告)日：2024-02-13

申请号：US17326131

申请日：2021-05-20

Applicant: Ningde Amperex Technology Limited

Inventor： Kefei Wang

IPC: H01M10/0569 ,  H01M4/13 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/48

CPC classification number: H01M10/0569 ,  H01M4/13 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/48 ,  H01M2300/0025

Abstract: An electrolyte includes a fluorinated cyclic carbonate, a chain carboxylate and a multi-nitrilemulti-nitrile compound having an ether bond. Based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrilemulti-nitrile compound having an ether bond. The electrolyte can control the expansion of the electrochemical device, so that the electrochemical device has excellent cycle, storage and/or floating-charge performance.

公开(公告)号：US11664501B2

公开(公告)日：2023-05-30

申请号：US17195508

申请日：2021-03-08

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Jing Jiang ,  Kefei Wang

IPC: H01M4/62 ,  H01M4/13 ,  H01M10/04 ,  H01M50/24 ,  H01M50/571 ,  H01M50/119 ,  H01M50/122 ,  H01M50/121 ,  H01M50/126 ,  H01M4/02

CPC classification number: H01M4/622 ,  H01M4/13 ,  H01M10/0431 ,  H01M50/119 ,  H01M50/121 ,  H01M50/122 ,  H01M50/126 ,  H01M50/24 ,  H01M50/571 ,  H01M2004/027 ,  Y02E60/10

Abstract: A battery includes a first conductive layer having a folded portion, a first edge, and a second edge opposite to the first edge in a first direction of the battery; a first conductive plate located on the first conductive layer; and a first layer comprising an insulating material covering at least one portion of the folded portion, and being distant from the first conductive layer. The first layer partially covers the first edge of the first conductive layer.

公开(公告)号：US11611111B2

公开(公告)日：2023-03-21

申请号：US16454875

申请日：2019-06-27

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Kefei Wang ,  Fei Wu ,  Jinli Wang ,  Jibin Geng

IPC: H01M10/0587 ,  H01M10/04 ,  H01M10/0525 ,  H01M50/538 ,  H01M50/466 ,  H01M50/536

Abstract: A cell includes a flat electrode assembly formed by superposing and winding respective first ends of a first electrode sheet, a first separator, a second electrode sheet, and a second separator. A first electrode tab is connected to the first electrode sheet, and a second electrode tab is connected to the second electrode sheet. The second electrode sheet includes a second current collector, a second outer membrane arranged on a surface facing away from a center of the cell, and a second inner membrane arranged on a surface facing the center of the cell. Respective starting ends of the second outer membrane and the second inner membrane are located on the second current collector between the first end of the second electrode sheet and a second bend. The second inner membrane is provided with an inner uncoated region at least at the second bend.

公开(公告)号：US11522222B2

公开(公告)日：2022-12-06

申请号：US17064782

申请日：2020-10-07

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Kefei Wang ,  Qiao Zeng ,  Liangzhen Xiao ,  Fei Wu

IPC: H01M10/0566 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0569

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the content X of the nitrile compound and the content Y of the trinitrile compound meet the conditions represented by Formula (1) and Formula (2): {about 2 wt %≤(X+Y)≤about 11 wt % . . . (1), about 0.1≤(X/Y)≤about 8 . . . (2)}. The electrolyte further includes at least one selected from the group consisting of a cyclic carbonate ester having a carbon-carbon double bond, a fluorinated chain carbonate ester, a fluorinated cyclic carbonate ester, and a compound having a sulfur-oxygen double bond. The electrolyte is capable of effectively inhibiting the increase in DC internal resistance of an electrochemical device so that the electrochemical device has excellent cycle and storage performance.

公开(公告)号：US11380964B2

公开(公告)日：2022-07-05

申请号：US16430409

申请日：2019-06-03

Applicant: Ningde Amperex Technology Limited

Inventor： Qiao Zeng ,  Kefei Wang ,  Liangzhen Xiao

IPC: H01M50/46 ,  H01M10/04

Abstract: The embodiments of the present application provides a wound electrode assembly formed by winding a first electrode sheet, a second electrode sheet, and an isolating membrane disposed therebetween. The wound electrode assembly includes: a first surface having a first protrusion in the thickness direction of the wound electrode assembly; a first wound electrode assembly; a second wound electrode assembly wrapping the first wound electrode assembly, the first wound electrode assembly and the second wound electrode assembly sharing the first electrode sheet and the second electrode sheet; an adhesive layer disposed between the first electrode sheet and the isolating membrane, and/or between the second electrode sheet and the isolating membrane. The purpose of the present application is at least to provide a wound electrode assembly capable of reducing the risk of misalignment of the internal structures of the electrode assembly during the falling, and retaining the shape of the electrode assembly.

公开(公告)号：US11158844B2

公开(公告)日：2021-10-26

申请号：US16183549

申请日：2018-11-07

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qiao Zeng ,  Liangzhen Xiao ,  Kefei Wang

IPC: H01M10/0587 ,  H01M10/04 ,  H01M10/0583 ,  H01M4/13 ,  H01M4/78 ,  H01M10/0525

Abstract: A battery comprises a first electrode assembly including a first electrode, and a second electrode assembly disposed adjacent the first electrode assembly along a first direction. The first electrode comprises a first segment that is disposed on an outer portion of the second electrode assembly. The first electrode may further comprise a second segment electrically connected to the first segment. The second segment is disposed on an outer portion of the first electrode assembly.

公开(公告)号：US10955484B2

公开(公告)日：2021-03-23

申请号：US16214746

申请日：2018-12-10

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Fei Wu ,  Juan Jin ,  Kefei Wang

IPC: G01R31/389 ,  G01R31/3842 ,  G01R31/367 ,  G01R31/392

Abstract: The present disclosure relates to the field of battery state monitoring technologies, and in particular, to a battery state monitoring method and apparatus. The method is: monitoring a voltage value and a current value of an output end of a battery; determining a battery impedance value based on the voltage value; calculating an impedance voltage-drop value based on the current value and the battery impedance value; calculating an open circuit voltage of the battery based on the voltage value and the impedance voltage-drop value; when a difference of the open circuit voltage between two consecutive calculations is greater than or equal to a threshold, judging that the battery state is abnormal; and when the difference of the open circuit voltage between two consecutive calculations is determined to be lower than the threshold, updating the battery impedance value based on the voltage value and the current value. By using the foregoing method, the battery state is judged by verifying a relationship between a set threshold and a difference of the open circuit voltage between two consecutive calculations, thereby improving the accuracy of battery safety judgment. A possibility of a safety accident occurring in a battery can be predicted, thereby reducing or avoiding a risk of fire outbreak of a device caused due to a battery safety fault of the device.

公开(公告)号：US10658644B2

公开(公告)日：2020-05-19

申请号：US16133953

申请日：2018-09-18

Applicant: Ningde Amperex Technology Limited

Inventor： Hongzhan Yang ,  Jing Jiang ,  Qiao Zeng ,  Kefei Wang

IPC: H01M2/18 ,  H01M10/04 ,  H01M2/02 ,  H01M2/20 ,  B31D1/02

Abstract: Embodiments of the present application disclose a battery to reduce the volume of the battery, improve the energy density of the battery, and further improve the bottom molding effect of the battery, as well as the safety performance and service life of the battery. The battery comprises an electrode assembly and a package film for packaging the electrode assembly, the package film including a folding portion, the folding portion including a first segment attached to the end face of the electrode assembly and a second segment connected to the first segment. The first segment is arranged between the second segment and the electrode assembly, and the second segment includes a multilayer package films.

公开(公告)号：US20190165339A1

公开(公告)日：2019-05-30

申请号：US16175883

申请日：2018-10-31

Applicant: Ningde Amperex Technology Limited

Inventor： Jing Jiang ,  Kefei Wang

IPC: H01M2/02 ,  H01M2/32 ,  H01M2/10 ,  H01M4/62 ,  H01M4/13

Abstract: The present application relates to an electrode assembly and a secondary battery. The electrode assembly includes a cell and a protective layer. The cell includes a cell body and an electrode tab protruding from a top surface of the cell body. In a length direction of the cell, at least one end of the protective layer extends beyond the height at which the anode electrode in the cell body protrudes at the end, and the extended dimension is no more than 3 mm. As such, the burr of the anode electrode of the cell body is wrapped by the protective layer, which alleviates the phenomenon that the burr on the anode electrode pierces the package bag and chemically reacts with the aluminum layer of the package bag, thereby reducing the risk of leakage of the package bag.

公开(公告)号：US20190089005A1

公开(公告)日：2019-03-21

申请号：US16194539

申请日：2018-11-19

Applicant: Ningde Amperex Technology Limited

Inventor： Peipei Guo ,  Liangzhen Xiao ,  Wei Gao ,  Kefei Wang ,  Yi Zhao ,  Ping He

IPC: H01M10/0587 ,  H01M10/0525 ,  H01M2/26 ,  H01M4/70

Abstract: The present disclosure provides a wound-type electrode assembly comprising a first and second electrode plates, a first and second electrode tabs, and a separator. The first and second electrode plates include a first current collector and active substance layer, and a second current collector and active substance layer. Two surfaces of the first current collector of the first winding start section of the first electrode plate are not coated with first active substance layer and defined as a first start blank current collector, the first start blank current collector is welded to a first electrode tab. The second pole piece comprises a second groove, a bottom of which is a second current collector and a circumference thereof is a second active substance layer; the second electrode tab is accommodated in the second groove and electrically connected to the second current collector at the second groove.