The invention provides a laminated cell, a lithium ion battery, a battery module and a whole vehicle. The laminated battery cell comprises positive pole pieces and negative pole pieces which are alternately stacked and are separated by diaphragms; the positive pole piece comprises a positive current collector and a positive active layer, and the negative pole piece comprises a negative current collector and a negative active layer; wherein in the stacking direction, the thickness of the positive current collector is sequentially increased from the surface of the battery cell to the center of the battery cell, and/or the thickness of the negative current collector is also sequentially increased from the surface of the battery cell to the center of the battery cell. According to the laminated battery cell provided by the invention, the thicknesses of the positive electrode current collector and the negative electrode current collector closer to the surface of the battery cell are thinner, and the thicknesses of the positive electrode current collector and the negative electrode current collector closer to the center of the battery cell are thicker, so that the battery has high energy density; and the problem that the local temperature near the central position of the battery cell is too high during high-rate charging and discharging can also be remarkably improved, and the effects of efficient heat dissipation and temperature equalization are achieved.

    本发明提供了一种叠片电芯、锂离子电池、电池模组和整车车辆。所述叠片电芯包括交替堆叠的并由隔膜分隔的正极极片和负极极片;所述正极极片包括正极集流体和正极活性层,所述负极极片包括负极集流体和负极活性层;其中,沿所述堆叠方向,所述正极集流体的厚度从电芯的表面到电芯的中心依次增加,和/或负极集流体的厚度从电芯的表面到电芯的中心也依次增加。本发明提供的叠片电芯,越接近电芯表面的正极集流体与负极集流体厚度越薄,而越接近电芯中心的正极集流体与负极集流体越厚,可以保证电池具有高能量密度的同时,也可以显著改善大倍率充放电时电芯中心位置附近局部温度过高的问题,达到了高效散热与均温的效果。


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    Title :

    Laminated battery cell, lithium ion battery, battery module and whole vehicle


    Additional title:

    一种叠片电芯、锂离子电池、电池模组和整车车辆


    Contributors:
    DENG HAIFU (author) / TAN XIAONAN (author) / LI WENWEN (author)

    Publication date :

    2023-06-02


    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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