公开(公告)号：EP3965188A1

公开(公告)日：2022-03-09

申请号：EP20812772.0

申请日：2020-05-27

Applicant: BYD Company Limited

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

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

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 Li 1+m Ni 1-x-y-z Co x Mn y E z O 2 . 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：EP4243116A1

公开(公告)日：2023-09-13

申请号：EP21891146.9

申请日：2021-11-10

Applicant: BYD Company Limited

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

IPC: H01M4/36 ,  H01M4/48 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/058 ,  H01M10/42

Abstract: Provided is a lithium-ion battery, including a positive electrode plate, a separator, and a negative electrode plate. The separator is arranged between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active layer laminated in sequence. A positive electrode active material in the positive electrode active layer includes lithium manganese iron phosphate and a ternary material. The negative electrode plate includes a negative electrode current collector and a negative electrode active layer laminated in sequence. The negative electrode active layer includes a composite layer and a lithium replenishing layer. A negative electrode active material in the composite layer includes a carbon material and SiO x . An areal density of lithium in the lithium replenishing layer is m 2 =a ∗ M 1 ∗ m 1 ∗ δ ∗ (1-η)/M 2 .

公开(公告)号：EP4216314A1

公开(公告)日：2023-07-26

申请号：EP21868742.4

申请日：2021-09-18

Applicant: BYD Company Limited

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

IPC: H01M4/58 ,  H01M4/136 ,  H01M10/0525

Abstract: A positive electrode material, a positive electrode plate and a battery are provided. The 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. D 50 5 50 4 50 3 50 2 50 1 , D 50 2 = aD 50 1 , D 50 3 = bD 50 1 , D 50 4 = cD 50 1 , D 50 5 = dD 50 1 , and 5 µm ≤ D 50 1 ≤ 15 µm. 0.35 ≤ a ≤ 0.5, 0.2 ≤ b ≤ 0.27, 0.17 ≤ c ≤ 0.18, and 0.15 ≤ d ≤ 0.16. Molar ratios of manganese to iron in the first lithium manganese iron phosphate material, the second lithium manganese iron phosphate material, the third lithium manganese iron phosphate material and the fourth lithium manganese iron phosphate material increase in sequence, and the molar ratio of manganese to iron in the fifth lithium manganese iron phosphate material is greater than that in the third lithium manganese iron phosphate material.

公开(公告)号：EP4224574A1

公开(公告)日：2023-08-09

申请号：EP21885236.6

申请日：2021-10-28

Applicant: BYD Company Limited

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

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/505 ,  H01M4/54 ,  H01M4/56 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/525

Abstract: A lithium ion battery is provided, which includes a positive electrode sheet and a negative electrode sheet. The positive electrode active material of the positive electrode sheet includes lithium manganese iron phosphate and a ternary material. The negative electrode active material of the negative electrode sheet is graphite. The lithium ion battery meets the following formulas: 1.08 ≤ M 3 ∗ η 3 ∗ y / M 1 ∗ η 1 ∗ A 1 + M 2 ∗ η 2 ∗ A 2 ∗ x ≤ 1.12 and 0.49 ≤ M 1 ∗ 1 − η 1 ∗ A 1 + M 2 ∗ 1 − η 2 ∗ A 2 ∗ x / M 3 ∗ 1 − η 3 ∗ y ≤ 1.15 where M 1 is the first-charge specific capacity of lithium manganese iron phosphate, unit: mAh/g; η 1 is the initial efficiency of lithium manganese iron phosphate; A 1 is the percent by mass of lithium manganese iron phosphate in the positive electrode active material; M 2 is the first-charge specific capacity of the ternary material, unit: mAh/g; η 2 is the initial efficiency of the ternary material; A 2 is the percent by mass of the ternary material in the positive electrode active material; M 3 is the first-discharge specific capacity of graphite, unit: mAh/g; η 3 is the initial efficiency of graphite; and x is the coating amount of the positive electrode active material, and y is the coating amount of the negative electrode active material, where x and y are expressed in the same unit.

公开(公告)号：EP4216313A1

公开(公告)日：2023-07-26

申请号：EP21868741.6

申请日：2021-09-18

Applicant: BYD Company Limited

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

IPC: H01M4/58 ,  H01M4/136 ,  H01M10/0525 ,  C01B25/45

Abstract: A positive electrode material, a positive electrode plate and a battery are provided. The 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 sizes D 50 satisfy: D 50 5 50 4 50 3 50 2 50 1 , D 50 2 = aD 50 1 , D 50 3 = bD 50 1 , D 50 4 = cD 50 1 , D 50 5 = dD 50 1 , and 5 µm ≤ D 50 1 ≤ 15 µm, where 0.35 ≤ a ≤ 0.5, 0.2 ≤ b ≤ 0.27, 0.17 ≤ c ≤ 0.18, and 0.15 ≤ d ≤ 0.16.

公开(公告)号：EP4300633A1

公开(公告)日：2024-01-03

申请号：EP22774335.8

申请日：2022-03-25

Applicant: BYD Company Limited

Inventor： CHEN, Na ,  DENG, Xuanwei ,  PAN, Yi

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

Abstract: A lithium ion battery and a powered vehicle are disclosed. The lithium ion battery includes a positive electrode plate, a negative electrode plate, an electrolyte and a separator. The positive electrode plate includes a positive electrode current collector and a positive electrode material layer provided on the positive electrode current collector. The negative electrode plate includes a negative electrode current collector and a negative electrode material layer provided on the negative electrode current collector. The negative electrode active material in the negative electrode material layer is graphite. 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. In the positive electrode active material, the mass ratio of the lithium manganese iron phosphate material, the lithium iron phosphate material and the ternary material are A 1 , A 2 and A 3 respectively, and A 1 +A 2 +A 3 =1. It is defined that α = (M 4 x η 4 x Y)/[(M 1 × η 1 × A 1 +M 2 × η 2 × A 2 +M 3 × η 3 × A 3 ) × X], β=[M 1 × (1-η 1 ) × A 1 +M 2 × (1-η 2 ) × A 2 +M 3 x (1-η 3 ) × A 3 ] × X/[M 4 × (1-η 4 ) × Y], and the following conditions are satisfied: 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; the units of M 1 , M 2 , M 3 , and M 4 are all mAh/g; and the units of X and Y are g.

公开(公告)号：EP4199143A1

公开(公告)日：2023-06-21

申请号：EP21855634.8

申请日：2021-08-13

Applicant: BYD Company Limited

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

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

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：EP4345988A1

公开(公告)日：2024-04-03

申请号：EP22868782.8

申请日：2022-06-27

Applicant: BYD Company Limited

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

IPC: H01M10/615

Abstract: A self-heating control method and a self-heating control system for a rechargeable battery are disclosed. The rechargeable battery includes a battery cell. A separator is provided between a positive electrode and a negative electrode of the battery cell. A reference electrode is correspondingly provided at the separator. A surface electrode is correspondingly provided on the negative electrode surface of the battery cell. 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：EP4184615A1

公开(公告)日：2023-05-24

申请号：EP21843281.3

申请日：2021-04-15

Applicant: BYD Company Limited

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

IPC: H01M4/525

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: m 2 /g; and D represents a number of the primary cathode material particles in each of composite secondary particles.

公开(公告)号：EP4174980A1

公开(公告)日：2023-05-03

申请号：EP21830200.8

申请日：2021-05-13

Applicant: BYD Company Limited

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

IPC: H01M4/13

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 D 50 particle size of the main positive electrode material in the positive electrode active layer satisfies 1 / 2 − 1 n − 1 D 501 ≤ D 50 n ≤ 2 2 + 1 n − 1 D 501 . The D 90 particle size of the auxiliary positive electrode material is less than the D 10 particle size of the main positive electrode material in a first positive electrode active sub-layer.