公开(公告)号：US20240290944A1

公开(公告)日：2024-08-29

申请号：US18648388

申请日：2024-04-28

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Miaomiao Dong ,  Changfeng Bie ,  Shaocong Ouyang ,  Huan Ni ,  Hongyu Liu ,  Xin Sun ,  Chenghua Fu

IPC: H01M4/136 ,  H01M4/02 ,  H01M4/58 ,  H01M4/62 ,  H01M50/204 ,  H01M50/244

CPC classification number: H01M4/136 ,  H01M4/5825 ,  H01M4/62 ,  H01M50/204 ,  H01M50/244 ,  H01M2004/028

Abstract: Provided is a battery pack. The 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. At a temperature lower than or equal to 10° C., a ratio of a discharging capacity of a single cell of the second battery cell to a discharging capacity of a single cell of the first battery cell ranges from 1.003 to 1.12, and a ratio of a discharging capacity of a single cell of the third battery cell to a discharging capacity of a single cell of the second battery cell ranges from 1.005 to 1.15.

公开(公告)号：US11721804B2

公开(公告)日：2023-08-08

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 ,  H01M4/587 ,  H01M4/133 ,  H01M4/136 ,  H01M10/0525 ,  C01B25/45 ,  H01M4/58 ,  H01M4/02

CPC classification number: H01M4/366 ,  C01B25/45 ,  H01M4/133 ,  H01M4/136 ,  H01M4/587 ,  H01M4/5825 ,  H01M10/0525 ,  C01P2002/54 ,  C01P2004/04 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/80 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2220/20

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：US12095051B2

公开(公告)日：2024-09-17

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 ,  H01M4/02 ,  H01M4/136 ,  H01M4/36 ,  H01M4/58 ,  H01M4/60 ,  H01M10/0525 ,  H01M10/42 ,  H01M50/249

CPC classification number: H01M10/443 ,  H01M4/136 ,  H01M4/364 ,  H01M4/5825 ,  H01M4/60 ,  H01M10/0525 ,  H01M10/4235 ,  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：US20230035380A1

公开(公告)日：2023-02-02

申请号：US17935125

申请日：2022-09-25

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xue Leng ,  Hongyu Liu ,  Changfeng Bie ,  Na Liu ,  Wanqing Cai

IPC: H01M4/58 ,  H01M10/0525

Abstract: A positive active material is provided. In some embodiments, the positive material includes: a substrate and a coating layer coating the substrate, wherein the coating layer includes a fast ion conductor layer and a carbon coating layer, the substrate includes more than one compound of formula (I): LiFe1-aM1aPO4 formula (I), in formula (I), M1 is more than one selected from Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb and Ti, and 0≤a≤0.01; the fast ion conductor layer includes a fast ion conductor of a NASICON structure shown in formula (II), Li3-bFe2-bM2b(PO4)3 formula (II), in formula (II), M2 is more than one selected from Ti, Zr, Hf, Ge and Sn with valence of +4, and 0≤b≤1.