公开(公告)号：US11355742B2

公开(公告)日：2022-06-07

申请号：US16679168

申请日：2019-11-09

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhiqiang Li ,  Changlong Han

IPC: H01M4/133 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/02

Abstract: This application discloses a negative electrode plate and a lithium-ion secondary battery, wherein the negative electrode plate includes a negative electrode current collector and a negative active material layer disposed on at least one surface of the negative electrode current collector, and wherein the negative active material layer includes a graphite material; wherein a ratio r between diffraction peak intensity of (004) crystal surface and diffraction peak intensity of (110) crystal surface of the negative electrode plate, a porosity s of the negative electrode plate, and a resistivity t of the negative electrode plate satisfy: 0.05 ≤ 100 × s r × t ≤ 10. The negative electrode plate and the lithium-ion secondary battery provided by this application can simultaneously achieve high safety performance, cycle performance and rate performance.

公开(公告)号：US20240266633A1

公开(公告)日：2024-08-08

申请号：US18637019

申请日：2024-04-16

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Chao ZENG ,  Zhiqiang Li ,  Qingrong CHEN ,  Shengwei WANG

IPC: H01M10/654 ,  H01M10/04 ,  H01M10/617 ,  H01M50/102

CPC classification number: H01M10/654 ,  H01M10/617 ,  H01M50/102 ,  H01M10/0431

Abstract: This application relates to a bottom support for battery cell, a battery cell, a battery, and an electric device. The bottom support is configured for supporting a jelly roll, and the bottom support includes a bottom plate, where the bottom plate includes a central region and a peripheral region surrounding the central region. The bottom plate is constructed to form at least one recessed group, and a recessed area increases gradually among the recessed group(s) in a direction from the peripheral region to the central region of the bottom plate. The bottom support for battery cell, the battery cell, the battery, and the electric device provided in this application reduce the probability of thermal runaway in the battery cell.

公开(公告)号：US11929492B2

公开(公告)日：2024-03-12

申请号：US17566698

申请日：2021-12-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhiqiang Li ,  Qifeng Li ,  Changlong Han

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/0404 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2220/20

Abstract: A lithium-ion secondary battery and related preparation method thereof, battery module, battery pack and apparatus. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte and a separator, wherein the positive electrode plate includes a positive electrode current collector and a first positive electrode active material layer and a second positive electrode active material layer sequentially disposed on at least one side of the positive electrode current collector; the lithium-ion secondary battery satisfies: −1≤log10(u/v)×w≤15.5, wherein, u is a thickness of the first positive electrode active material layer in microns, v is a thickness of the second positive electrode active material layer in microns, w is a conductivity of the electrolyte at a temperature of 25° C. in mS·cm−1. The lithium-ion secondary battery has excellent performance such as low discharge resistance at low SOC and low gas production at high temperature.

公开(公告)号：US11677074B2

公开(公告)日：2023-06-13

申请号：US17389480

申请日：2021-07-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhiqiang Li ,  Changlong Han ,  Qifeng Li

IPC: H01M4/505 ,  H01M4/04 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/36 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/505 ,  H01M4/0404 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/364 ,  H01M4/525 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028

Abstract: The present application discloses a positive electrode plate, a method for preparation thereof, and related lithium-ion secondary battery, electric vehicle and electronic product. The positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ρsum of the positive electrode plate, the powder volume resistivity ρ of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ρsum/ρ97.5-a≤3.

公开(公告)号：US11581579B2

公开(公告)日：2023-02-14

申请号：US17052811

申请日：2019-08-29

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhiqiang Li ,  Changlong Han

IPC: H01M10/0567 ,  H01M10/0568 ,  H01M10/0525 ,  H01M4/04 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/02

Abstract: The present application discloses a lithium ion secondary battery comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film provided on at least one surface of the positive electrode current collector, and the positive electrode film comprises a first positive electrode active material represented by chemical formula Li1+xNiaCobMe1-a-bO2-yAy and a second positive electrode active material represented by chemical formula Li1+zMncN2-cO4-dBd; the positive electrode plate has a resistivity r of 3500 Ω·m or less; and the electrolyte comprises a fluorine-containing lithium salt type additive. The lithium ion secondary battery provided by the present application is capable of satisfying high safety performance, high-temperature storage performance and cycle performance simultaneously.

公开(公告)号：US11121369B2

公开(公告)日：2021-09-14

申请号：US17051462

申请日：2019-08-29

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhiqiang Li ,  Changlong Han ,  Qifeng Li

IPC: H01M4/505 ,  H01M4/131 ,  H01M4/525 ,  H01M4/1391 ,  H01M4/04 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/02

Abstract: The present application discloses a positive electrode plate, a preparation method thereof, and a lithium-ion secondary battery, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ρsum of the positive electrode plate, the powder volume resistivity ρ of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ρsum/ρ97.5-a≤3. The positive electrode plate provided in the present application enables the lithium-ion secondary battery to simultaneously have higher safety performance, rate performance and cycle performance.