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    POSITIVE ELECTRODE PLATE, METHOD FOR PREPARING THE SAME AND LITHIUM-ION SECONDARY BATTERY
    2.
    发明申请
    POSITIVE ELECTRODE PLATE, METHOD FOR PREPARING THE SAME AND LITHIUM-ION SECONDARY BATTERY 有权

    公开(公告)号：US20210159495A1

    公开(公告)日：2021-05-27

    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 ,  H01M10/0525 ,  H01M4/1391 ,  H01M4/04

    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.

    BATTERY BOX, BATTERY, AND ELECTRIC DEVICE
    3.
    发明申请
    BATTERY BOX, BATTERY, AND ELECTRIC DEVICE 有权

    公开(公告)号：US20240396145A1

    公开(公告)日：2024-11-28

    申请号：US18792802

    申请日：2024-08-02

    Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

    Inventor： Zhiqiang LI ,  Chao Zeng ,  Cong Bao ,  Shengwei Wang

    IPC: H01M50/242 ,  H01M50/227

    Abstract: This application provides a battery box, a battery, and an electric device. The battery box includes a bottom plate and a frame. Each of two ends of the frame is provided with an opening, the opening at one end of the frame is connected to an edge of the bottom plate to form an accommodating space, and a light energy absorber is arranged on a side of the bottom plate in the accommodating space facing the accommodating space. According to the battery box provided in this application, in a case that an impact or a collision occurs at the bottom of the battery box, the light energy absorber can absorb the impact energy produced by the impact or collision, thereby greatly reducing the vibration, extrusion, and collision intensity of a battery module in the battery box. The light energy absorber provides buffering and protection for the battery module.

    LITHIUM ION SECONDARY BATTERY
    4.
    发明申请
    LITHIUM ION SECONDARY BATTERY 有权

    公开(公告)号：US20210242498A1

    公开(公告)日：2021-08-05

    申请号：US17052811

    申请日：2019-08-29

    Applicant: Contemporary Amperex Technology Co., Limited

    Inventor： Zhiqiang LI ,  Changlong HAN

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

    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.

    LITHIUM ION SECONDARY BATTERY
    5.
    发明申请
    LITHIUM ION SECONDARY BATTERY 有权

    公开(公告)号：US20210175500A1

    公开(公告)日：2021-06-10

    申请号：US16768753

    申请日：2019-09-10

    Applicant: Contemporary Amperex Technology Co., Limited

    Inventor： Zhiqiang LI ,  Changlong HAN

    IPC: H01M4/505 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/525 ,  H01M10/0569 ,  H01M10/0568 ,  C01G53/00

    Abstract: This application relates to a lithium ion secondary battery comprising a battery core and an electrolyte, wherein the battery core comprises a lithium-manganese-based positive electrode active material; the electrolyte comprises a solvent, a lithium salt and an additive comprising vinylene carbonate; and wherein the weight percentage q of the electrolyte based on the total weight of the positive electrode active material layer in the battery core, the weight percentage r of vinylene carbonate present in the electrolyte, the compaction density s of the negative electrode active material layer in the battery core and the weight percentage p of manganese element present in the positive electrode active material satisfies 0.05≤q·r·s/p≤6, wherein the units of q, r, and p are wt %, and the unit of s is g/cm3. The lithium ion secondary battery in this application has relatively high safety performance, cycle performance and storage performance.

    LITHIUM ION SECONDARY BATTERY
    6.
    发明申请
    LITHIUM ION SECONDARY BATTERY 有权

    公开(公告)号：US20210083282A1

    公开(公告)日：2021-03-18

    申请号：US16767889

    申请日：2019-09-12

    Applicant: Contemporary Amperex Technology Co., Limited

    Inventor： Zhiqiang LI

    IPC: H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  H01M4/134 ,  H01M4/36 ,  H01M10/0525

    Abstract: The present application discloses a lithium ion secondary battery, comprising a positive electrode plate comprising a positive active material layer, a negative electrode plate comprising a negative active material layer, wherein: the positive active material layer comprises a lithium manganese-based positive active material as a positive active material; the negative active material layer and/or electrolyte comprise a sulfur-containing compound so that the sulfur-containing compound forms a sulfur-containing solid electrolyte interface film in the negative active material layer, and the mass percentage v of the sulfur element present in the negative active material layer containing the interface film and the mass percentage u of the manganese element present in the positive active material satisfy the following formula: v=0.018u+ω, in which u and v both are in wt % and ω is 0.01˜2. The present lithium ion secondary battery exhibits higher safety, cycle and storage performances.

    LITHIUM-ION BATTERY, AND RELATED BATTERY MODULE, BATTERY PACK, AND APPARATUS
    7.
    发明申请
    LITHIUM-ION BATTERY, AND RELATED BATTERY MODULE, BATTERY PACK, AND APPARATUS 有权

    公开(公告)号：US20220149437A1

    公开(公告)日：2022-05-12

    申请号：US17583728

    申请日：2022-01-25

    Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

    Inventor： Chengdu LIANG ,  Zhiqiang LI ,  Changlong HAN

    IPC: H01M10/0568 ,  H01M10/0525 ,  H01M4/587 ,  H01M4/36 ,  H01M10/0569 ,  C01D15/00 ,  C01B21/086

    Abstract: This application discloses a lithium-ion battery, and related battery module, a battery pack, and an apparatus. The lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, where the negative electrode plate includes a negative electrode active material layer containing a negative electrode active material, and the electrolyte includes an electrolyte lithium salt. The electrolyte lithium salt includes a first lithium salt, the first lithium salt is selected from fluorine-containing sulfonimide lithium salts, and the first lithium salt and the negative electrode plate satisfy the following relation (1). The lithium-ion battery of this application has high safety performance, long cycle life, and good high-temperature storage performance. 0.6 ≤ M E × C I M A P ⁢ D A × P A ≤ 6 . 2 ( 1 )

    LITHIUM-ION SECONDARY BATTERY AND RELATED PREPARATION METHOD THEREOF, BATTERY MODULE, BATTERY PACK AND APPARATUS
    10.
    发明申请
    LITHIUM-ION SECONDARY BATTERY AND RELATED PREPARATION METHOD THEREOF, BATTERY MODULE, BATTERY PACK AND APPARATUS 有权

    公开(公告)号：US20220123286A1

    公开(公告)日：2022-04-21

    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 ,  H01M4/505 ,  H01M4/525 ,  H01M4/04

    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.

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