Patents by Inventor Qifeng Li
Qifeng Li has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240147787Abstract: A display module includes a display panel, a flexible printed circuit, a composite adhesive layer, and at least one conductive structure. The display panel includes a base substrate. The flexible printed circuit includes at least one first conductive region, and is electrically connected to the display panel. The composite adhesive layer is located at one side of the base substrate away from a light emission surface of the display panel. The composite adhesive layer includes at least one first through hole penetrating through the composite adhesive layer, and the conductive structure is at least partially located within the first through hole. Along a direction perpendicular to a plane where the base substrate is located, length of the composite adhesive layer is H1, and length of the conductive structure is H2, where H1?H2. The conductive structure is electrically connected to the first conductive region.Type: ApplicationFiled: December 28, 2022Publication date: May 2, 2024Inventors: Shengming LI, Jiang CHEN, Qifeng ZHU
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Patent number: 11929492Abstract: A lithium-ion secondary battery and related preparation method thereof, battery module, battery pack and apparatus. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte and a separator, wherein the positive electrode plate includes a positive electrode current collector and a first positive electrode active material layer and a second positive electrode active material layer sequentially disposed on at least one side of the positive electrode current collector; the lithium-ion secondary battery satisfies: ?1?log10(u/v)×w?15.5, wherein, u is a thickness of the first positive electrode active material layer in microns, v is a thickness of the second positive electrode active material layer in microns, w is a conductivity of the electrolyte at a temperature of 25° C. in mS·cm?1. The lithium-ion secondary battery has excellent performance such as low discharge resistance at low SOC and low gas production at high temperature.Type: GrantFiled: December 31, 2021Date of Patent: March 12, 2024Assignee: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang Li, Qifeng Li, Changlong Han
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Patent number: 11925010Abstract: A display panel, a display module and a manufacture method thereof, and a communication device are provided. The display panel includes a display substrate and a multiplexing circuit arranged on a first surface of the display substrate. The display panel further includes a wave-absorbing material layer arranged on a second surface of the display substrate. The wave-absorbing material layer is configured to absorb electromagnetic wave interference signals. The second surface is a surface opposite to the first surface.Type: GrantFiled: August 28, 2019Date of Patent: March 5, 2024Assignees: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.Inventors: Chao Wang, Binfeng Feng, Yonghui Luo, Fei Li, Yupeng Chen, Jiaxiang Wang, Zijie Zhang, Qifeng Li
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Publication number: 20230246184Abstract: The present application discloses a positive electrode active material, a positive electrode plate, a lithium-ion secondary battery, and an apparatus. The positive electrode active material satisfies a chemical formula Li1+x(NiaCobMnc)1-dMdO2-yAy, wherein M is one or more selected from Zr, Sr, B, Ti, Mg, Sn and Al, A is one or more selected from S, N, F, Cl, Br and I, ?0.01?x?0.2, 0.12?b/c?0.9, 0.002?b×c/a2?0.23, a+b+c=1, 0?d?0.1, and 0?y<0.2; and an interval particle size distribution curve of the positive electrode active material has a full width at half maximum DFW of from 4 ?m to 8 ?m. The positive electrode active material provided in the present application has relatively low cobalt content and relatively high cycle life and capacity performance.Type: ApplicationFiled: March 8, 2023Publication date: August 3, 2023Applicant: Contemporary Amperex Technology Co., LimitedInventors: Qifeng LI, Qilan ZHANG, Na LIU
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Patent number: 11677074Abstract: The present application discloses a positive electrode plate, a method for preparation thereof, and related lithium-ion secondary battery, electric vehicle and electronic product. The positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ?sum of the positive electrode plate, the powder volume resistivity ? of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ?sum/?97.5-a?3.Type: GrantFiled: July 30, 2021Date of Patent: June 13, 2023Assignee: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang Li, Changlong Han, Qifeng Li
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Publication number: 20230156985Abstract: A display panel, a display module and a manufacture method thereof, and a communication device are provided. The display panel includes a display substrate and a multiplexing circuit arranged on a first surface of the display substrate. The display panel further includes a wave-absorbing material layer arranged on a second surface of the display substrate. The wave-absorbing material layer is configured to absorb electromagnetic wave interference signals. The second surface is a surface opposite to the first surface.Type: ApplicationFiled: August 28, 2019Publication date: May 18, 2023Inventors: Chao WANG, Binfeng FENG, Yonghui LUO, Fei LI, Yupeng CHEN, Jiaxiang WANG, Zijie ZHANG, Qifeng LI
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Publication number: 20220123286Abstract: A lithium-ion secondary battery and related preparation method thereof, battery module, battery pack and apparatus. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte and a separator, wherein the positive electrode plate includes a positive electrode current collector and a first positive electrode active material layer and a second positive electrode active material layer sequentially disposed on at least one side of the positive electrode current collector; the lithium-ion secondary battery satisfies: ?1?log10(u/v)×w?15.5, wherein, u is a thickness of the first positive electrode active material layer in microns, v is a thickness of the second positive electrode active material layer in microns, w is a conductivity of the electrolyte at a temperature of 25° C. in mS·cm?1. The lithium-ion secondary battery has excellent performance such as low discharge resistance at low SOC and low gas production at high temperature.Type: ApplicationFiled: December 31, 2021Publication date: April 21, 2022Applicant: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang LI, Qifeng Li, Changlong Han
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Publication number: 20220052338Abstract: The present application discloses a positive electrode active material, a positive electrode plate, a lithium-ion secondary battery, and an apparatus. The positive electrode active material satisfies a chemical formula Li1+x(NiaCobMnc)1?dMdO2?yAy, wherein M is one or more selected from Zr, Sr, B, Ti, Mg, Sn and Al, A is one or more selected from S, N, F, Cl, Br and I, ?0.01?x?0.2, 0.12?b/c?0.9, 0.002?b×c/a2?0.23, a+b+c=1, 0?d?0.1, and 0?y?0.2; and an interval particle size distribution curve of the positive electrode active material has a full width at half maximum DFW of from 4 ?m to 8 ?m. The positive electrode active material provided in the present application has relatively low cobalt content and relatively high cycle life and capacity performance.Type: ApplicationFiled: October 28, 2021Publication date: February 17, 2022Applicant: Contemporary Amperex Technology Co., LimitedInventors: Qifeng LI, Qilan ZHANG, Na Liu
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Publication number: 20210359302Abstract: The present application discloses a positive electrode plate, a method for preparation thereof, and related lithium-ion secondary battery, electric vehicle and electronic product. The positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ?sum of the positive electrode plate, the powder volume resistivity ? of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ?sum/?97.5-a?3.Type: ApplicationFiled: July 30, 2021Publication date: November 18, 2021Applicant: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang LI, Changlong HAN, Qifeng LI
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Patent number: 11127356Abstract: Embodiments of the present disclosure relate to a method for compensating brightness unevenness of a display device. In an embodiment of the present disclosure, a display device includes a display screen, a data driving circuit, and a mainboard. The method for compensating brightness unevenness according to an embodiment of the present disclosure includes obtaining, by the data driving circuit, first brightness compensation data from the mainboard. Then, the data driving circuit adjusts image data according to the first brightness compensation data.Type: GrantFiled: January 4, 2019Date of Patent: September 21, 2021Assignees: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.Inventors: Qifeng Li, Chuanyan Lan, Yong Yu
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Patent number: 11121369Abstract: The present application discloses a positive electrode plate, a preparation method thereof, and a lithium-ion secondary battery, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ?sum of the positive electrode plate, the powder volume resistivity ? of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ?sum/?97.5-a?3. The positive electrode plate provided in the present application enables the lithium-ion secondary battery to simultaneously have higher safety performance, rate performance and cycle performance.Type: GrantFiled: August 29, 2019Date of Patent: September 14, 2021Assignee: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang Li, Changlong Han, Qifeng Li
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Publication number: 20210159495Abstract: The present application discloses a positive electrode plate, a preparation method thereof, and a lithium-ion secondary battery, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film includes a positive active material which is a lithium manganese-based positive active material; and wherein the volume resistivity ?sum of the positive electrode plate, the powder volume resistivity ? of the positive active material under a pressure of 20 MPa and the mass percentage a of the positive active material in the positive electrode film satisfy ?sum/?97.5-a?3. The positive electrode plate provided in the present application enables the lithium-ion secondary battery to simultaneously have higher safety performance, rate performance and cycle performance.Type: ApplicationFiled: August 29, 2019Publication date: May 27, 2021Applicant: Contemporary Amperex Technology Co., LimitedInventors: Zhiqiang LI, Changlong HAN, Qifeng LI
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Publication number: 20210134246Abstract: Embodiments of the present disclosure relate to a method for compensating brightness unevenness of a display device. In an embodiment of the present disclosure, a display device includes a display screen, a data driving circuit, and a mainboard. The method for compensating brightness unevenness according to an embodiment of the present disclosure includes obtaining, by the data driving circuit, first brightness compensation data from the mainboard. Then, the data driving circuit adjusts image data according to the first brightness compensation data.Type: ApplicationFiled: January 4, 2019Publication date: May 6, 2021Inventors: Qifeng LI, Chuanyan LAN, Yong YU
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Patent number: 10901144Abstract: A light guiding structure, a display device and a method of using the same are provided. The light guiding structure includes a housing including an opening; and a first optical fiber structure, an image collection module, a second optical fiber structure, and an image compensation module in the housing. The first optical fiber structure is configured to transmit light incident into the opening to the image collection module; and the second optical fiber structure is configured to transmit an image displayed by the image compensation module to the opening. The display device includes the light guiding structure.Type: GrantFiled: August 6, 2019Date of Patent: January 26, 2021Assignees: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.Inventors: Fei Li, Binfeng Feng, Qifeng Li, Yonghui Luo, Chao Wang, Ying Liu, Hairui Zhao, Yupeng Chen
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Publication number: 20200209470Abstract: A light guiding structure, a display device and a method of using the same are provided. The light guiding structure includes a housing including an opening; and a first optical fiber structure, an image collection module, a second optical fiber structure, and an image compensation module in the housing. The first optical fiber structure is configured to transmit light incident into the opening to the image collection module; and the second optical fiber structure is configured to transmit an image displayed by the image compensation module to the opening. The display device includes the light guiding structure.Type: ApplicationFiled: August 6, 2019Publication date: July 2, 2020Inventors: Fei LI, Binfeng FENG, Qifeng LI, Yonghui LUO, Chao WANG, Ying LIU, Hairui ZHAO, Yupeng CHEN
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Publication number: 20200167544Abstract: The disclosure provides a the lines unlocking method, a lines unlocking system, and a display device, and the lines unlocking method includes: a touch pressure detector provides a driving chip with a first enabling signal, and a lines recognizing chip with a second enabling signal upon determining that the touch pressure detector is triggered; the driving chip drives the display screen to display an unlocking background image pre-stored in the driving chip, upon reception of the first enabling signal, where the unlocking background image indicates a position for lines unlocking; the lines recognizing chip acquires lines data upon reception of the second enabling signal, and provides a master controller with the acquired lines data; and the master controller compares the acquired lines data with pre-stored lines data upon reception of the acquired lines data to enable lines unlocking.Type: ApplicationFiled: July 22, 2019Publication date: May 28, 2020Inventor: Qifeng LI
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Patent number: 10290865Abstract: The present application relates to the technical field of Li-ion battery and, more particularly, to a positive electrode material for a Li-ion battery, a method for preparing the same, and a Li-ion battery containing the same. The positive electrode material for a Li-ion battery includes a substrate material and a coating layer coated on a surface of the substrate material, wherein the coating layer includes boron, a chemical formula of the substrate material is LixNiaCobMncO2, wherein 0.99<x?1.1, 0.3<a<0.9, 0.1<b<0.4, 0.1<c<0.4, and a+b+c=1; and the substrate material consists of a large particle substrate material and a small particle substrate material. In the present application, by gradation of large particles and small particles, the pellet density, the capacity density, the room-temperature cycle performance, the high-temperature cycle performance and low temperature discharging performance of the Li-ion battery are improved.Type: GrantFiled: September 14, 2017Date of Patent: May 14, 2019Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITEDInventors: Qifeng Li, Dingshan Ruan, Wei Liang, Na Liu, Long Wang
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Publication number: 20180090753Abstract: The present application relates to the technical field of Li-ion battery and, more particularly, to a positive electrode material for a Li-ion battery, a method for preparing the same, and a Li-ion battery containing the same. The positive electrode material for a Li-ion battery includes a substrate material and a coating layer coated on a surface of the substrate material, wherein the coating layer includes boron, a chemical formula of the substrate material is LixNiaCobMncO2, wherein 0.99<x?1.1, 0.3<a<0.9, 0.1<b<0.4, 0.1<c<0.4, and a+b+c=1; and the substrate material consists of a large particle substrate material and a small particle substrate material. In the present application, by gradation of large particles and small particles, the pellet density, the capacity density, the room-temperature cycle performance, the high-temperature cycle performance and low temperature discharging performance of the Li-ion battery are improved.Type: ApplicationFiled: September 14, 2017Publication date: March 29, 2018Inventors: Qifeng LI, Dingshan RUAN, Wei LIANG, Na LIU, Long WANG
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Publication number: 20170033354Abstract: The present application provides a positive electrode material, a method for preparing the same and a Li-ion battery containing the positive electrode material, wherein, the positive electrode material is represented as Li1+xNiaCobMncMdO2, in which M is selected from one or more of Mg, Ti, Zn, Zr, Al and Nb. The positive electrode material provided by the present application has a small crystal volume and a small Li—Ni synchysis degree. In addition, after the positive electrode material provided by the present application is applied to a Li-ion battery, the Li-ion battery possesses a better cycle performance, a higher initial charge-discharge efficiency and a better power property. Moreover, in the present application, a precursor is prepared by a coprecipitation method, and then the precursor is sintered together with a Li source and a metal oxide to obtain the positive electrode material.Type: ApplicationFiled: September 29, 2015Publication date: February 2, 2017Applicant: Ningde Contemporary Amperex Technology LimitedInventors: Dingshan RUAN, Miaomiao REN, Xuguang GAO, Qifeng LI, Na LIU, Yongshou LIN
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Publication number: 20130244867Abstract: The present invention relates to a novel catalyst for producing N-substituted carbamates, the preparation of the catalyst and an improved method for producing N-substituted carbamates from these novel catalysts. The active component of the catalyst is a heteropoly acid and the catalyst support comprises a metal oxide or a metalloid oxide. The catalyst can be used to promote the reaction of carbamate and amine, thereby generating N-substituted carbamates with high yield. In the presence of the catalyst, the reaction conditions are relatively mild, the catalytic activity and selectivity of the reaction are high, and the reaction time is relatively short. Furthermore, the catalyst can be conveniently separated from the reaction system and recycled, therefore, the catalyst can be used to facilitate the further scale-up test and commercial application.Type: ApplicationFiled: May 2, 2013Publication date: September 19, 2013Inventors: Stefan Wershofen, Stephan Klein, Hongchao Li, Xinkui Wang, Qifeng Li, Maoquing Kang