公开(公告)号：US20240363858A1

公开(公告)日：2024-10-31

申请号：US18767006

申请日：2024-07-09

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Miaomiao DONG ,  Shaocong OUYANG ,  Changfeng BIE ,  Hongyu LIU ,  Huan NI ,  Chenghua FU ,  Xin SUN

IPC: H01M4/58 ,  H01M4/02 ,  H01M4/36 ,  H01M4/38 ,  H01M4/60 ,  H01M10/0525

CPC classification number: H01M4/5825 ,  H01M4/364 ,  H01M4/366 ,  H01M4/382 ,  H01M4/60 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2004/028

Abstract: The present application provides a secondary battery, a battery module, a battery pack, and an electrical device. The secondary battery includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, in which the positive electrode plate comprises a positive electrode coating containing a positive electrode active material comprising a lithium iron phosphate material and a conjugated carbonyl compound. In a discharge process of the secondary battery, in addition to a discharge plateau of the lithium iron phosphate material, a discharge curve further includes a relatively low discharge plateau provided by the conjugated carbonyl compound.

公开(公告)号：US20230062063A1

公开(公告)日：2023-03-02

申请号：US17938930

申请日：2022-09-06

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Hongyu LIU ,  Changfeng BIE ,  Xue LENG ,  Na LIU

IPC: H01M4/36 ,  H01M4/58 ,  H01M4/587 ,  H01M4/133 ,  H01M4/136 ,  H01M10/0525 ,  C01B25/45

Abstract: A positive active material made of carbon-coated lithium iron phosphate includes a lithium iron phosphate substrate, and a carbon coating layer on a surface of the substrate. The lithium iron phosphate substrate has a general structural formula LiFe1-aMaPO4, where M is at least one selected from Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb, or Ti, and 0≤a≤0.01. A carbon coating factor of the carbon-coated lithium iron phosphate, η = BET ⁢ 1 BET ⁢ 2 , satisfies 0.81≤η≤0.95, where BET1 denotes a specific surface area of mesopore and macropore structures in the carbon-coated lithium iron phosphate, and BET2 denotes a total specific surface area of the carbon-coated lithium iron phosphate.

公开(公告)号：US20230207938A1

公开(公告)日：2023-06-29

申请号：US18117400

申请日：2023-03-04

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shaocong OUYANG ,  Chenghua FU ,  Miaomiao DONG ,  Yonghuang YE ,  Changfeng BIE

IPC: H01M50/204 ,  H01M4/525 ,  H01M4/505 ,  H01M10/44

CPC classification number: H01M50/204 ,  H01M4/525 ,  H01M4/505 ,  H01M10/441 ,  H01M2220/20 ,  H01M2004/028

Abstract: A battery pack may comprise a first battery cell type and a second battery cell type, wherein the first battery cell type may include n first battery cells, and the second battery cell type may include m second battery cells, with n and m being each independently selected from an integer of 1 or more. The second battery cell may have an internal resistance less than that of the first battery cell, the difference in internal resistance between the first battery cell and the second battery cell may be ≥0.15 mohm; the percentage by number of the first battery cells in the battery cells comprised in the area A may be 20% to 100%; and the percentage by number of the second battery cells in the battery cells comprised in the area B may be 5% to 100%.

公开(公告)号：US20230170472A1

公开(公告)日：2023-06-01

申请号：US18084551

申请日：2022-12-20

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Changfeng BIE ,  Huan NI ,  Xue LENG ,  Miaomiao DONG ,  Shaocong OUYANG ,  Na LIU

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/525 ,  H01M4/62

CPC classification number: H01M4/366 ,  H01M4/587 ,  H01M4/525 ,  H01M4/625 ,  H01M2004/028

Abstract: A positive electrode plate may include a current collector, a first positive electrode active material layer and a second positive electrode active material layer. The first positive electrode active material layer may comprise a first positive electrode active material, a first binder and a first conductive agent; the second positive electrode active material layer may comprise a second positive electrode active material, a second binder and a second conductive agent. The second positive electrode active material may be selected from carbon-coated LiβFeαM(1−α)PO4, and the second positive electrode active material may have a diffraction peak A between 29° and 30° in the X-ray diffraction pattern, and a diffraction peak B between 25° and 26°, and the intensity ratio IA/IB of the diffraction peaks may satisfy: 0.98≤IA/IB≤1.1.

公开(公告)号：US20230327100A1

公开(公告)日：2023-10-12

申请号：US18324592

申请日：2023-05-26

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Huan NI ,  Changfeng BIE ,  Xiang YIN ,  Shaocong OUYANG ,  Miaomiao DONG ,  Na LIU

IPC: H01M4/525 ,  H01M4/505 ,  H01M4/36 ,  C01G53/00

CPC classification number: H01M4/505 ,  C01G53/50 ,  H01M4/366 ,  H01M4/525 ,  H01M2004/021

Abstract: A single-crystalline-structured low-cobalt ternary positive material, a chemical formula thereof is Li1+x(NiaCobMnc)1-dMdO2-yAy, where a mole fraction of Co element is low. 0.05 ≤ b ≤ 0.14; and in a single particle, a ratio of an average Co content per unit area of an outer layer to an average Co content per unit area of an inner core in a cross section passing through a geometric center of the particle is in a range 1.2-5.0:1, optionally, in a range 1.4-2.0:1 is disclosed. The material has better structural stability and dynamic performance at low temperature and high voltage, which improves cycle performance and power performance of the secondary battery at low temperature and high voltage. A method for preparing the low-cobalt ternary positive material, a secondary battery, a battery module, a battery pack, and a power consumption apparatus including the material is also disclosed

公开(公告)号：US20240106060A1

公开(公告)日：2024-03-28

申请号：US18503736

申请日：2023-11-07

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Miaomiao DONG ,  Hongyu LIU ,  Changfeng BIE ,  Shaocong OUYANG ,  Huan NI ,  Chenghua FU ,  Xin SUN

IPC: H01M50/267 ,  H01M4/505 ,  H01M4/58 ,  H01M10/44 ,  H01M10/617 ,  H01M50/244

CPC classification number: H01M50/267 ,  H01M4/505 ,  H01M4/5825 ,  H01M10/443 ,  H01M10/617 ,  H01M50/244 ,  H01M2010/4292 ,  H01M2220/20

Abstract: A battery pack includes a battery pack box with an internal space including a first region to an n-th region, each provided with a battery cell. A positive electrode active substance in a positive electrode of each k-th battery cell includes lithium iron phosphate and/or lithium nickel cobalt manganate having a first discharge voltage plateau and one or more types of supplementary active substances having a second discharge voltage plateau. For the first battery cell to the n-th battery cell, in any case where a sum of a discharge capacity corresponding to the first discharge voltage plateau and a discharge capacity corresponding to the second discharge voltage plateau is 100%, a discharge capacity proportion corresponding to the second discharge voltage plateau of the k-th battery cell is greater than a discharge capacity proportion corresponding to the second discharge voltage plateau of the (k−1)-th battery cell.

公开(公告)号：US20240088460A1

公开(公告)日：2024-03-14

申请号：US18384675

申请日：2023-10-27

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Miaomiao DONG ,  Shaocong OUYANG ,  Huan NI ,  Hongyu LIU ,  Changfeng BIE ,  Xin SUN ,  Chenghua FU

IPC: H01M10/44 ,  H01M4/136 ,  H01M10/0525 ,  H01M50/249

CPC classification number: H01M10/443 ,  H01M4/136 ,  H01M10/0525 ,  H01M10/441 ,  H01M50/249 ,  H01M2004/028

Abstract: A battery pack includes a first battery cell, a second battery cell, and a third battery cell. A positive electrode active substance of each battery cell is composed of lithium iron phosphate and a low-temperature additive. The low-temperature additive is selected from compounds containing at least two carbonyl groups, which are conjugated with an unsaturated structure or an atom having lone-pair electrons connected with the carbonyl groups, and a discharging cut-off voltage of the battery pack at a low temperature has the following rules: discharging cut-off voltages V1, V2, and V3 of the first battery cell, second battery cell, and third battery cell range from 1.95V to 2.1V, from 1.8 V to 2.0V, from 1.6V to 1.9V, respectively, and V1, V2, and V3 satisfy a relationship of V1>V2>V3.

公开(公告)号：US20220359874A1

公开(公告)日：2022-11-10

申请号：US17863295

申请日：2022-07-12

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Changfeng BIE ,  Xia HU ,  Qian LIU ,  Na LIU ,  Xiaofu XU ,  Huan NI

IPC: H01M4/58 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M4/36 ,  H01M4/04

Abstract: This application provides a mixed positive electrode material, a positive electrode plate and a preparation method thereof, a battery, and an apparatus. The mixed positive electrode material includes a mixed component consisting of a material of lithium iron phosphate chemical system and a material of ternary chemical system, where the material of lithium iron phosphate chemical system is secondary particles with an average specific surface area within 10 m2/g. In the mixed positive electrode material of this application, the introduction of lithium iron phosphate secondary particles having a low specific surface area improves ease of processing of the mixed positive electrode material, making a slurry less prone to agglomeration and the two materials highly miscible. When the positive electrode plate is prepared by using the mixed positive electrode material of this application, uniform distribution of the positive electrode material on the positive electrode plate can be effectively improved.