The invention provides a battery cell, a lithium ion battery and a preparation method thereof, the battery cell comprises a first pole group and a second pole group which are connected in parallel, each of the first pole group and the second pole group comprises a positive pole piece containing Co and Ni, the mass content of Ni in the positive pole piece of the first pole group is 80%-98%, and the mass content of Ni in the negative pole piece of the second pole group is 10%-20%. And the mass content of Co in the positive pole piece of the second pole group is 1-20%, and the mass content of Ni is less than 80%. The first pole group and the second pole group are connected in parallel to form the battery cell, the second pole group with high safety performance and good structural stability can make up for the problem of insufficient safety and structural stability brought by the first pole group, and the first pole group with high energy density can make up for the problem of low energy density brought by the second pole group; the first pole group and the second pole group are used in parallel, the energy density of the whole battery cell is improved by the first pole group, and the safety performance and the structural stability of the whole battery cell are improved by the second pole group, so that the whole battery cell has high energy density, high safety performance and good structural stability.

    本申请提供了一种电芯、锂离子电池及其制备方法,所述电芯包括并联的第一极组和第二极组,所述第一极组和第二极组均包括含有Co和Ni的正极极片,所述第一极组的正极极片中Ni的质量含量为80%‑98%,所述第二极组的正极极片中Co的质量含量为1%至20%且Ni的质量含量小于80%。本申请通过将第一极组和第二极组并联形成电芯,高安全性能和良好结构稳定性的第二极组可以弥补第一极组带来的安全性及结构稳定性不足的问题,高能量密度的第一极组可以弥补第二极组带来的能量密度较低的问题,二者并联使用,第一极组提升了整个电芯的能量密度,第二极组提升了整个电芯的安全性能和结构稳定性能,使得整个电芯同时兼具高能量密度、高安全性能及良好的结构稳定性。


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    Title :

    Battery cell, lithium ion battery, preparation method of lithium ion battery and vehicle


    Additional title:

    电芯、锂离子电池及其制备方法和车辆


    Contributors:
    GUO MINGKUI (author)

    Publication date :

    2024-01-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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