Battery cell, battery module and battery pack
A battery cell and winding core technology, which is applied to battery pack components, secondary batteries, electrode carriers/collectors, etc., and can solve problems such as thermal runaway of the battery cell and easy short circuit of the battery cell
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Embodiment 1-20
[0058] Examples 1-20 respectively provide 20 kinds of cells (battery 1-20), the thickness A of the insulating support layer 111 of the 20 kinds of cells, the thickness C of the winding core 115 and the ratio E of the capacity of the cell to the surface area of the cell The relationship between them is shown in Table 1. At the same time, the positive electrode current collector and the insulating support layer 111 of the negative electrode current collector of the 20 types of cells are made of PET, the conductive layer 113 of the positive electrode current collector is made of aluminum foil, and its thickness is 2um, and the material of the negative electrode current collector conductive layer 113 is copper. foil, its thickness is 2um. The thickness of the positive electrode active material layer obtained after cold pressing of the positive electrode active material coated on the positive electrode current collector is 0.1290 mm, and the active particles of the positive elect...
experiment example 1
[0068] Acupuncture experiments were performed on 20 types of cells provided in Example 1-20 and 4 types of cells provided in Comparative Examples 1-4, and during the test, the cells were placed in a constant current of 1.0C and charged to 4.3V, and then After constant voltage charging until the current is reduced to 0.05C, a high temperature resistant steel needle with a diameter of 5mm is used to penetrate from the direction perpendicular to the electrode piece of the cell at a speed of 25mm / s, and the penetration position is 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.
[0069] Table 3. Acupuncture experimental data of cells
[0070] type Acupuncture test results Battery 1# No smoke, no fire, no explosion Battery 2# No smoke, no fire, no explosion Battery 3# No smoke, no fire, no explosion Battery 4# No smoke, no f...
experiment example 2
[0073] 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. The charging strategy is as follows: at an ambient temperature of 25±5°C, the cell is wrapped with thermal insulation cotton made of 10mm thick glass wool, charged to 4.3V at a constant current of 1C, and then left for 30 minutes; at the same time, the temperature rise recorded The condition is 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, and records are recorded every 1s. Cell temperature. The condition for voltage recording is to use a voltage test device to monitor the voltage of the pos...
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