Battery cell, battery module and battery pack
A battery cell and winding core technology, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as easy short circuit of the battery cell, thermal runaway of the battery cell, etc.
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Embodiment 1-20
[0054] Embodiments 1-20 respectively provide 20 kinds of cells (cells 1-20), the thickness A of the insulating support layer 211 of the 20 kinds of cells, the weight percentage I of the nickel element in the positive electrode active material, and the thickness of the cell winding core 213. The relationship among the three thicknesses C is shown in Table 1. Meanwhile, the positive electrode current collectors and the insulating support layers 211 of the negative electrode current collectors of the 20 types of cells are made of PET, the conductive layer 212 of the positive electrode current collector is made of aluminum foil, and the material of the negative electrode current collector conductive layer 212 is copper foil. The double-sided thickness of the positive electrode active material layer coated on the positive electrode current collector is 105um, and the active particles of the positive electrode active material are nickel cobalt lithium manganate. The double-sided thi...
experiment example 1
[0064] The 20 types of batteries provided in Example 1-20 and the 4 types of batteries provided in Comparative Example 1-2 were subjected to acupuncture experiments according to the procedures in the national standard GBT31485. The test conditions were: 25±5°C, fully charged to 4.2V, A 3mm steel needle was inserted into the explosion-proof valve of the battery cell (with a clamp) at a speed of 25mm / s. The experimental results after 1h of observation are shown in Table 3.
[0065] Table 3. Acupuncture experimental data of cells
[0066] type Acupuncture test results Cell 1# No smoke, no fire, no explosion Cell 2# No smoke, no fire, no explosion Cell 3# No smoke, no fire, no explosion Cell 4# No smoke, no fire, no explosion Cell 5# No smoke, no fire, no explosion Cell 6# No smoke, no fire, no explosion Cell 7# No smoke, no fire, no explosion Cell 8# No smoke, no fire, no explosion Cell 9# No smoke, no fire...
experiment example 2
[0069] The temperature rise and voltage tests were carried out under the same conditions as the 20 kinds of cells provided in the embodiment 1-20 of the present invention and the 2 kinds of cells provided in the comparative example 1-2. Among them, the charging strategy is: at an ambient temperature of 25±5°C, the cell is wrapped with thermal insulation cotton made of 10mm thick thermal insulation glass wool, and charged to 4.1V at a constant current of 100A1C, and left for 30min; at the same time, the temperature rise The recording conditions are that during the charging process, a multi-channel thermometer is used to monitor the temperature of the battery cell, and one section of the temperature sensing line is connected to the multi-channel thermometer, and the other end is attached to the center point of the large surface of the battery cell. 1s to record the cell temperature. The condition of voltage recording is to use a voltage test device to monitor the voltage of the ...
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