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：US20230420671A1

公开(公告)日：2023-12-28

申请号：US18464932

申请日：2023-09-11

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Zehui LIN ,  Huan NI ,  Hongyu LIU

IPC: H01M4/525 ,  H01M4/505 ,  H01M10/052

CPC classification number: H01M4/525 ,  H01M4/505 ,  H01M10/052 ,  H01M2004/028

Abstract: A positive electrode active material includes an active material A having a composition formula of Lix1Nia1Cob1Mnc1O2-y1Qy1, an active material B having a composition formula of Lix2Nia2Cob2Mnc2O2-y2Qy2, and an active material C having a composition formula of Lix3Nia3Cob3Mnc3O2-y3Qy3, where the subscripts in the formulae are as defined in the description. The active material A has an average particle size Dv50 greater than both an average particle size Dv50 of the active material B and an average particle size Dv50 of the active material C.

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：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.