公开(公告)号：US20210367268A1

公开(公告)日：2021-11-25

申请号：US15734035

申请日：2019-12-25

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Kefei WANG

IPC: H01M10/0567 ,  H01M10/0568 ,  H01M10/0569

Abstract: An electrochemical device, including a cathode, an electrolyte and an anode. The electrolyte includes at least one of the following compounds: a) propionate; b) a compound having a cyano group(s); c) lithium difluorophosphate; or d) a compound of Formula 1: where, R is substituted or unsubstituted C1-C10 hydrocarbyl, and when substituted, the substituent is halogen. The anode includes an anode active material layer, and a contact angle of the anode active material layer relative to a non-aqueous solvent is not greater than 60° as measured by a contact angle measurement. The electrochemical device has improved cycle performance and high-temperature storage performance.

公开(公告)号：US20190178950A1

公开(公告)日：2019-06-13

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

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：US20190013550A1

公开(公告)日：2019-01-10

申请号：US16113952

申请日：2018-08-27

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qiao ZENG ,  Kefei WANG ,  Jiacai CAI ,  Yu LUO

IPC: H01M10/0587 ,  H01M2/26 ,  H01M10/0525 ,  H01M10/04

Abstract: A wound-type cell includes a first electrode plate; a second electrode plate; a separator, disposed between the first electrode plate and the second electrode plate; a first electrode tab electrically connected to the first electrode plate; and a second electrode tab electrically connected to the second electrode plate, in which the separator includes a third winding start end, the third winding start end is folded back to an inner side in a thickness direction and is disposed between the first electrode tab and the second electrode tab in a length direction.