公开(公告)号：US20240429554A1

公开(公告)日：2024-12-26

申请号：US18824942

申请日：2024-09-05

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Chong Xu ,  Cheng Li ,  Jianrui Yang

IPC: H01M50/417 ,  C08J5/18 ,  C08L23/06 ,  H01M50/403 ,  H01M50/489 ,  H01M50/491 ,  H01M50/494

Abstract: This application relates to a polyolefin-based film, including polyolefins with different weight-average molecular weights; where thickness of the polyolefin-based film is ≤6 μm, and the polyolefin-based film has a machine-direction shrinkage of ≤2% and a transverse-direction shrinkage of ≤1% at 115° C./1 h. This application uses polyolefins with different weight-average molecular weights as raw materials, enabling the resulting polyolefin-based films to have an ultra-thin thickness and a low thermal shrinkage. The reduction in thickness of the polyethylene-based film can improve the energy density of the cell to some extent, and the reduction in thermal shrinkage can improve the short-circuit test pass rate of the bare cell, enhancing the safety performance of the cell. In addition, the reduction in thermal shrinkage helps improve the heat resistance of the polyolefin-based film, delaying the thermal failure of adjacent cells when thermal runaway occurs in a cell.

公开(公告)号：US20240405227A1

公开(公告)日：2024-12-05

申请号：US18636308

申请日：2024-04-16

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xin Liu ,  Xianghui Liu ,  Qisen Huang ,  Mingling Li ,  Cheng Li

IPC: H01M4/66 ,  H01M4/02 ,  H01M4/04

Abstract: This application provides a composite current collector for positive electrode including a support layer and a conductive layer disposed on at least one side of the support layer. The support layer is an organic support layer. The support layer has a thickness d1, a tensile strength at break T1, a yield strength Q1, and an elastic modulus G1; the conductive layer has a total thickness d2, a tensile strength at break T2, and an elastic modulus G2; and the composite current collector for positive electrode satisfies the following condition: (d1×T1−(d2×T2)×(1−α)−d1×Q1×α)≥800 Pa·m, where α=G1/(G1+G2).

公开(公告)号：US12100843B2

公开(公告)日：2024-09-24

申请号：US18325016

申请日：2023-05-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xin Liu ,  Qisen Huang ,  Mingling Li ,  Xianghui Liu ,  Cheng Li ,  Jia Peng ,  Chengdu Liang

IPC: H01M4/66 ,  H01M4/04 ,  H01M50/46 ,  H01M4/02

CPC classification number: H01M4/667 ,  H01M4/0404 ,  H01M50/46 ,  H01M2004/028

Abstract: A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0

公开(公告)号：US20220085384A1

公开(公告)日：2022-03-17

申请号：US17537520

申请日：2021-11-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xin LIU ,  Shiwen Wang ,  Qisen Huang ,  Cheng Li ,  Mingling Li ,  Jia Peng ,  Xianghui Liu

IPC: H01M4/66

Abstract: The present application discloses a composite current collector, an electrode plate and an electrochemical device. The composite current collector includes an organic support layer and a metal conductive layer disposed on at least one surface of the organic support layer; and the composite current collector has a brittleness parameter C of 0.01≤C≤0.5. The composite current collector provided by the present application has relatively high mechanics and mechanical properties which having good electrical conductivity and current collection performance, which can improve preparation yield of the composite current collector, the electrode plate and the electrochemical device and their reliability during use, and enables the electrochemical device to have relatively high electrochemical performance and gravimetric energy density.