Battery cell, battery module and battery pack
A technology of batteries and winding cores, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., and can solve problems such as thermal runaway of batteries and easy short circuit of batteries
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Embodiment 1-20
[0052] Examples 1-20 respectively provide 20 kinds of cells (cells 1-20), the thickness A of the insulating support layer 411 of the 20 kinds of cells (here specifically refers to the insulating support layer 411 of the positive electrode sheet), and the thickness F of the separator The relationship between the capacity D of the battery cell and the ratio E of the capacity of the battery cell to the surface area of the battery cell is shown in Table 1. At the same time, the insulating support layers 411 of the positive electrode current collector and the negative electrode current collector of the 20 types of cells are made of PET, the conductive layer 412 of the positive electrode current collector is made of aluminum foil, and its thickness is 8-20um, and the material of the negative electrode current collector conductive layer 412 For copper foil, its thickness is 2-15um. The thickness of the positive electrode active material layer formed after the positive electrode she...
experiment example 1
[0061] Acupuncture experiments were performed on 20 types of cells provided in Examples 1-20 and 4 types of cells provided in Comparative Examples 1-4 according to the procedures in the national standard GBT31485. During the test, put the battery cell in a constant current of 1.0C and charge it to 4.3V, and then charge it with a constant voltage until the current is reduced to 0.05C, and then use a high-temperature-resistant steel needle with a diameter of 1mm at a speed of 2mm / s. The penetration was carried out in the direction of the electrode piece of the cell, and the penetration position was close to the geometric center of the acupuncture surface. The steel needle stayed in the cell and observed for one hour. The experimental results are shown in Table 3.
[0062] Table 3. Acupuncture experimental data of cells
[0063]
[0064]
[0065] According to the data tested in Table 3, compared with Comparative Examples 1-4, the thickness A of the insulating support layer ...
experiment example 2
[0067] The temperature rise and voltage tests were carried out under the same conditions as the 20 types of cells provided in the examples 1-20 of the present invention and the 4 types of cells provided in the comparative examples 1-4. Among them, the charging strategy is: under the ambient temperature of 25±5℃, the outer part of the cell is covered with insulation cotton made of 10mm thick glass wool, charged to 4.3V with a constant current of 1C, and then put on hold for 30 minutes. At the same time, the temperature rise test The recording conditions are that during the charging process, a multi-channel thermometer is used to monitor the temperature of the battery cell at an ambient temperature of 25±5°C, and one section of the temperature sensing line is connected to the multi-channel thermometer, and the other end is attached to the battery cell. The position of the center point of the large surface of the surface, and the temperature of the cell is recorded every 1s. The ...
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