Cylindrical lithium ion battery with over charging protective function and its preparing method
An overcharge protection, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as battery power failure and reduce battery transportation reliability, and achieve the effects of improving overcharge protection, shortening power-off time, and saving raw materials
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Embodiment 1
[0020] Injection amount experiment: the present invention comprises the battery of 1000-2600mAh capacity, and present embodiment is with the 18650 battery of 1800mAh as example, with 0.6MP air pressure (N 2 Atmosphere) lower sealing and normal pressure (0.1MP) sealing battery comparison. The battery liquid injection volumes are four kinds listed in Table 1, which are respectively injected into two groups of batteries with different sealing methods. After the battery undergoes 0.2C formation and 0.5C post-treatment, a 3.6A-18.5V overcharge safety experiment is performed. The specific method of the overcharge experiment is: charge the battery to 4.2V at a rate of 0.5C, wrap the battery with thermal insulation cotton with a thickness of 1.2-2cm after compression, and then charge the battery with a current of 3.6A. The upper limit voltage is set to 18.5V. The battery current, voltage, and shell surface temperature are collected in the middle. Experimental judgment standard: the ...
Embodiment 2
[0024] Different air pressure experiments: the present invention includes batteries with a capacity of 1000-2600mAh. This embodiment takes a 1800mAh 18650 battery as an example to compare batteries sealed under different air pressures. The liquid injection volume of the battery is 3.0g / Ah. After the battery is formed at 0.2C and post-treated at 0.5C, the overcharge experiment in Example 1 is carried out. Table 2 is the test results. It can be seen from the test results that with the increase of the sealing pressure, the overcharge safety of the battery is improved, but when the sealing pressure is greater than 1.0MP, the battery will be cut off during the formation period and scrapped.
[0025] Table 2
[0026] experiment number
Embodiment 3
[0028] Different gas experiments: the present invention includes batteries with a capacity of 1000-2600mAh. This embodiment is based on the 18650 battery with 1800mAh as an example. The liquid injection volume of the battery is 3.0g / Ah. 2 , Ar, CO 2 Gas and inert gas, etc., this embodiment is sealed under the atmosphere of A, B, and C with a pressure of 0.6MP. After the battery undergoes 0.2C formation and 0.5C post-treatment, the overcharge experiment in Example 1 is carried out. At the same time, the battery 1C rate charge and discharge cycle test was carried out. Table 3 shows the test results. From the test results, it can be seen that the type of pressurized gas selected has no adverse effect on the overcharge safety and cycle performance of the battery.
[0029] table 3
[0030] experiment number
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