公开(公告)号：US20220255066A1

公开(公告)日：2022-08-11

申请号：US17614285

申请日：2020-05-27

Applicant: BYD COMPANY LIMITED

Inventor： Yi PAN ,  Rong HAO ,  Na CHEN ,  Xiaotao YUAN

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

Abstract: Disclosed herein are a composite cathode material for a lithium-ion battery, a lithium-ion battery, and a vehicle. A core of the cathode material is a lithium-nickel-cobalt-manganese oxide material. A surface layer of the cathode material is a lithium-nickel-cobalt oxide material doped with an element E. There is a transition layer between the core and the surface layer. The transition layer is a lithium-nickel-cobalt-manganese oxide material doped with the element E. A content of the element E in the transition layer shows a decreasing trend in a direction from the surface layer of the cathode material to the core. A general formula for the composition of the transition layer is Li1+mNi1-x-y-zCoxMnyEzO2. 0≤m≤0.1, 0.01≤x≤0.1, 0.01≤y≤0.1, and 0.01≤z≤0.1. E is at least one of Al, Zr, Ti, Y, Ba or Sr.

公开(公告)号：US20240128537A1

公开(公告)日：2024-04-18

申请号：US18532313

申请日：2023-12-07

Applicant: BYD COMPANY LIMITED

Inventor： Ke ZHANG ,  Na CHEN ,  Jiannian LI ,  Yi PAN ,  Zizhu GUO

IPC: H01M10/63 ,  H01M10/615 ,  H01M10/625 ,  H01M10/659 ,  H02J7/00

CPC classification number: H01M10/63 ,  H01M10/615 ,  H01M10/625 ,  H01M10/659 ,  H02J7/0047 ,  H01M2220/20

Abstract: A self-heating control method and a self-heating control system for a rechargeable battery are disclosed. The rechargeable battery includes a battery core. A separator is provided between a positive electrode and a negative electrode of the battery core. A reference electrode is correspondingly provided at the separator. A surface electrode is correspondingly provided on the negative electrode surface of the battery core. The method includes: detecting the potential difference between the reference electrode and the surface electrode, generating a charging current adjustment instruction according to the potential difference between the reference electrode and the surface electrode, and adjusting the charging current of the rechargeable battery according to the charging current adjustment instruction during the self-heating process of the rechargeable battery.

公开(公告)号：US20230352671A1

公开(公告)日：2023-11-02

申请号：US18041663

申请日：2021-08-13

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Yecheng TIAN ,  Sanzhi CHEN ,  Rong HAO ,  Yi PAN

IPC: H01M4/505 ,  H01M4/04 ,  H01M4/58 ,  H01M4/525 ,  H01M4/131 ,  C01G53/00

CPC classification number: H01M4/505 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/5825 ,  H01M4/525 ,  H01M4/131 ,  C01G53/50 ,  H01M2004/021

Abstract: Disclosed are a mixed positive electrode material, a positive electrode plate and a manufacturing method therefor, and a battery. The mixed positive electrode material includes: a ternary material and a phase change material, where the phase change material undergoes a phase change in a charging/discharging voltage range of the ternary material, the ternary material has a single crystal structure, and the phase change material has a single crystal structure or an aggregate structure; a mass fraction ratio of the ternary material to the phase change material is 70:30 to 99.8:0.2; and the ternary material has a nanohardness of 0.001-5 Gpa, and the phase change material has a nanohardness of 0.01-10 GPa.

公开(公告)号：US20230223534A1

公开(公告)日：2023-07-13

申请号：US18122538

申请日：2023-03-16

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Minghao ZHUANG ,  Rong HAO ,  Yi PAN

IPC: H01M4/58 ,  H01M4/36 ,  H01M4/136 ,  C01B25/45

CPC classification number: H01M4/5825 ,  H01M4/364 ,  H01M4/136 ,  C01B25/45 ,  H01M2004/028

Abstract: A positive electrode material includes a first lithium manganese iron phosphate material in an aggregate form, a second and third lithium manganese iron phosphate materials in an aggregate and/or single-crystal-like form, and a fourth and fifth lithium manganese iron phosphate materials in a single-crystal-like form. A particle quantity ratio of the first to fifth lithium manganese iron phosphate materials is (0.8 to 1.2):(0.8 to 1.2):(1.6 to 2.4):(6.4 to 9.6):(6.4 to 9.6), and particle size D50 relationships satisfy: D505

公开(公告)号：US20230238513A1

公开(公告)日：2023-07-27

申请号：US18121909

申请日：2023-03-15

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Minghao ZHUANG ,  Rong HAO ,  Yi PAN

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  C01B25/45

CPC classification number: H01M4/364 ,  H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  C01B25/45 ,  H01M2004/021

Abstract: A positive electrode material includes a first lithium manganese iron phosphate material in an aggregate form, a second and third lithium manganese iron phosphate materials in an aggregate and/or single-crystal-like form, and a fourth and fifth lithium manganese iron phosphate materials in a single-crystal-like form. D505

公开(公告)号：US20230163280A1

公开(公告)日：2023-05-25

申请号：US18154660

申请日：2023-01-13

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Zewen RUAN ,  Yecheng TIAN ,  Xuanwei DENG ,  Nan ZHANG

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

CPC classification number: H01M4/366 ,  H01M4/525 ,  H01M4/505 ,  C01G53/50 ,  H01M2004/028

Abstract: The present disclosure provides a cathode material including multiple composite secondary particles, each of the composite secondary particles including multiple primary cathode material particles, where the composite secondary particles meet: 0.9≤0.1D/A+B*C≤20 (Relation 1). In which A represents a particle size D50 of the primary cathode material particles, unit: μm; B represents a particle size D50 of the composite secondary particles, unit: μm; C represents a specific surface area of the composite secondary particles, unit: m2/g; and D represents a number of the primary cathode material particles in each of composite secondary particles.

公开(公告)号：US20240021793A1

公开(公告)日：2024-01-18

申请号：US18473996

申请日：2023-09-25

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Xuanwei DENG ,  Yi PAN

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/587 ,  H01M4/136 ,  H01M4/58 ,  H01M4/131 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/587 ,  H01M4/136 ,  H01M4/5825 ,  H01M4/131 ,  H01M4/525 ,  H01M2220/20 ,  H01M2004/021

Abstract: A positive electrode plate of a lithium-ion battery includes a positive electrode material layer provided on a positive electrode current collector. A negative electrode plate of the lithium-ion battery includes a graphite negative electrode material layer provided on a negative electrode current collector. The positive electrode material layer includes a positive electrode active material consisting of a lithium manganese iron phosphate material, a lithium iron phosphate material and a ternary material with a mass ratio of A1+A2+A3=1. α=(M4×η4×Y)/[M1×η1×A1+M2×η2×A2+M3×η3×A3)×X], β=[M1×(1−η1)×A1+M2×(1−η2)×A2+M3×(1−η3)×A3]×X/[M4×(1−η4)×Y], 1.03≤α≤1.15, and 0.55≤β≤1.5, where X is the coating amount of the positive electrode active material on the positive electrode plate, and Y is the coating amount of graphite on the negative electrode plate.

公开(公告)号：US20230299281A1

公开(公告)日：2023-09-21

申请号：US18021225

申请日：2021-08-04

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Zewen RUAN ,  Yan ZHU ,  Rong HAO ,  Yi PAN

IPC: H01M4/525 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/525 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/043 ,  H01M10/0525 ,  H01M2004/028

Abstract: The present invention discloses a composite positive electrode material, a positive electrode plate and a preparation method thereof, and a battery. The composite positive electrode material comprises a ternary material (11) and a phase-transition material (12). The phase-transition material (12) undergoes phase transition in the charge/discharge voltage window of the ternary material (11). The ternary material (11) has a single crystal structure, the phase-transition material (12) has a single crystal structure or a poly-crystalline structure, and the phase-transition material (12) is coated on the surface of the ternary material (11). The weight ratio of the ternary material (11) to the phase-transition material (12) is 80:20-99.8:0.2. The ternary material (11) has a nanohardness of 0.001-5 GPa, and the phase-transition material (12) has a nanohardness of 0.01-10 GPa. According to the embodiment of the present invention, the cycle performance of the battery is improved, the impedance increase of the material during the aging process is reduced, and the safety of the battery is improved.

公开(公告)号：US20230253549A1

公开(公告)日：2023-08-10

申请号：US18012599

申请日：2021-05-13

Applicant: BYD COMPANY LIMITED

Inventor： Zewen RUAN ,  Na CHEN ,  Rong HAO ,  Yi PAN

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/131 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/505 ,  H01M4/131 ,  H01M4/525 ,  H01M2004/028

Abstract: Provided is a positive electrode plate, including a current collector and a positive electrode active layer arranged on the current collector. The positive electrode active layer includes m positive electrode active sub-layers. A positive electrode active material in each positive electrode active sub-layer includes a main positive electrode material and an auxiliary positive electrode material. The D50 particle size of the main positive electrode material in the positive electrode active layer satisfies 1/(√{square root over (2)}−1)n−1D501≤D50n≤n(√{square root over (2)}+1)n−1D501. The D90 particle size of the auxiliary positive electrode material is less than the D10 particle size of the main positive electrode material in a first positive electrode active sub-layer.