公开(公告)号：US20230087960A1

公开(公告)日：2023-03-23

申请号：US17991674

申请日：2022-11-21

Applicant: BYD COMPANY LIMITED

Inventor： Xi JIANG ,  Yi PAN

IPC: H01M50/242 ,  H01M50/489 ,  B60L58/12 ,  H01M50/249

Abstract: A battery pack, a vehicle and an energy storage device. The battery pack includes at least one battery sequence. The battery sequence includes a plurality of batteries. At least one of the batteries includes a casing and a core packaged in the casing. A gap exists between two neighboring batteries. A ratio of the gap to the thickness of the battery is c, and c satisfies the following relational expression: (a−b)

公开(公告)号：US20210210823A1

公开(公告)日：2021-07-08

申请号：US17059459

申请日：2019-05-17

Applicant: BYD COMPANY LIMITED

Inventor： Wansong YUAN ,  Yi PAN ,  Guihai LIANG ,  Fulan TANG

IPC: H01M50/536 ,  H01M10/0525 ,  H01M50/586 ,  H01M50/59

Abstract: An electrode assembly for a lithium-ion secondary battery and a preparation method thereof, and a lithium-ion secondary battery are disclosed. The electrode assembly comprises an electrode and an electrode post, where an electrode tab is extended from the electrode; a welding connection portion is formed by welding between the electrode tab and the electrode post; the welding connection portion has a bulge welding defect; the surface of the welding connection portion is covered with a polymer protective layer, and the thickness of the polymer protective layer is greater than or equal to the thickness of the bulge welding defect; and the bulge welding defect is embedded in the polymer protective layer.

公开(公告)号：US20250074253A1

公开(公告)日：2025-03-06

申请号：US18951271

申请日：2024-11-18

Applicant: BYD COMPANY LIMITED

Inventor： Ke ZHANG ,  Rongfang WU ,  Xi WANG ,  Zizhu GUO ,  Yi PAN

IPC: B60L58/18 ,  H01M10/052 ,  H01M10/42 ,  H01M10/44 ,  H01M10/48 ,  H02J7/00 ,  H02J7/34

Abstract: A power supply device includes a first and a second battery cell. A ratio of first parameters of the first battery cell to the second battery cell is greater than a first threshold. A ratio of second parameters of the second battery cell to the first battery cell is greater than a second threshold. When a capacity of the first battery cell is greater than that of the second battery cell, the first battery cell and/or the second battery cell are/is discharged according to a rule including a first, a second, and a third condition. When the first condition is satisfied, the first battery cell is discharged to a load. When the second condition is satisfied, the first battery cell and the second battery cell are discharged to the load. When the third condition is satisfied, the first battery cell is discharged to the second battery cell and the load.

公开(公告)号：US20240109436A1

公开(公告)日：2024-04-04

申请号：US18535746

申请日：2023-12-11

Applicant: BYD COMPANY LIMITED

Inventor： Ke ZHANG ,  Congji E ,  Zizhu GUO ,  Yi PAN ,  Zhipei LU

IPC: B60L50/64 ,  B60L58/18

CPC classification number: B60L50/64 ,  B60L58/18 ,  H01M2010/4271

Abstract: A battery pack and a vehicle are provided. The battery pack is configured to provide electric energy required by the vehicle under different operating conditions. The battery pack includes a task manager, a first battery unit and a second battery unit. The first battery unit and the second battery unit respectively respond to a different operating state of a load and provide the electric energy required under the control of the task manager.

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.

公开(公告)号：US20230023215A1

公开(公告)日：2023-01-26

申请号：US17785871

申请日：2020-11-11

Applicant: BYD COMPANY LIMITED

Inventor： Riguo MEI ,  Xiaoya CHANG ,  Ziwen WU ,  Yi PAN

IPC: H01M4/38 ,  H01M10/0525 ,  H01M4/04 ,  H01M4/62

Abstract: The present disclosure relates to a lithium-replenishing material, a preparation method thereof, and a lithium-ion battery. The lithium-replenishing material comprises metal lithium particles and conductive material, and the conductive material includes a built-in segment embedded in metal lithium particles and an exposed segment external to metal lithium particles; the electrical conductivity of the conductive material is greater than 100 s/cm. The lithium-replenishing material of the present disclosure can accomplish the electron conduction between the metal lithium particles and the anode active material through the conductive material, which increases the channel of electron conduction, and at the same time facilitates the transport of lithium ions, and improves the efficiency of lithium-replenishing significantly by rapid intercalation process of lithium ions, thereby resulting in inhibiting the formation of isolated lithium effectively and avoiding the formation of dendrites piercing the battery separator and causing potential safety hazards.

公开(公告)号：US20220359952A1

公开(公告)日：2022-11-10

申请号：US17624477

申请日：2020-07-03

Applicant: BYD COMPANY LIMITED

Inventor： Yi PAN ,  Li BAI ,  Zeng PAN ,  Yan ZHU ,  Meng ZHANG

IPC: H01M50/46 ,  H01M10/0525 ,  H01M50/403 ,  H01M50/449

Abstract: An adhesive-coated separator for a lithium-ion battery, a preparation method thereof, and use thereof are disclosed. The adhesive-coated separator for a lithium-ion battery of the present disclosure includes a base membrane and an adhesive coating formed on a surface of the base membrane, the thickness deviation percentage of the adhesive coating is less than or equal to 10%, the thickness deviation percentage=(Dmax−Dmin)/Dave×100%, Dmax is a maximum value of the thickness of the adhesive coating, Dmin is a minimum value of the thickness of the adhesive coating, and Dave is an average value of the thickness of the adhesive coating.

公开(公告)号：US20250033530A1

公开(公告)日：2025-01-30

申请号：US18917096

申请日：2024-10-16

Applicant: BYD COMPANY LIMITED

Inventor： Ke ZHANG ,  Zizhu GUO ,  Yi PAN ,  Yan ZHU ,  Huajun SUN

IPC: B60L58/24 ,  B60L15/00 ,  B60L58/27 ,  H01M10/615 ,  H01M10/625 ,  H01M10/63 ,  H01M10/6571 ,  H01M50/51 ,  H05B6/10

Abstract: A power battery comprises a first battery cell group and a second battery cell group that are not equal in electromotive force and connected in series. The heating system comprises an inverter, an alternating-current motor, and a first controller. Midpoints of three bridge arms of the inverter are connected to head ends of three-phase coils of the motor in a one-to-one correspondence manner, and tail ends of the motor are connected together to form a neutral point. The neutral point is connected to a first connection point by means of a connection line, and the first connection point is a connection point between the first and second battery cell groups. The first controller is used for inputting a driving signal to the inverter. The first battery cell group, the second battery cell group, the inverter, the motor, and the connection line form an alternating-current self-heating loop.