Lithium batteries originally support high current charging and discharging, not the original OPPO. Previously, some people used PAD's charger (2A charging current limit) to charge IPHONE (IPHONE charger is 1A limit), and the speed is super fast. OPPO claims to be the world's fastest and safest mobile phone charging technology - what is the principle of VOOC technology? The following answer comes from the lithium battery practitioner - Su Jie to answer your questions.
The so-called VOOC technology is actually the initial large rate (charge current and battery capacity override) current for charging. Failure to disassemble, mobile phone battery laminations and windings, laminated battery according to different formulations, support to 1.5 times the capacity (3Ah battery with 4.5A current) charging, 3 times the capacity of the discharge, the battery itself temperature rise 15 ° C; the temperature rise of the wound battery is slightly higher.
First of all, the lithium battery originally supports high current charging and discharging, not the original OPPO. Previously, some people used PAD's charger (2A charging current limit) to charge IPHONE (IPHONE charger is 1A limit), and the speed is super fast.
Go back to OPPO, please see the charging curve given on the website:
A maximum of 4500 mA of current is charged 25 minutes before the entire charging process. For its configured 3000 mAh battery, 1.5 times of high current charging is used, so that the battery capacity reaches about 70% in 25 minutes. Then turn down the charging current and fill it slowly. Why not use high current charging all the time, because the battery temperature rise is a gradual process, 25 minutes should be for the battery it chooses, the temperature rise of this time period is within the allowable range. If you continue to use this current to charge, in fact, it will be full in 45 minutes, but the temperature rise is unbearable and will cause damage to the battery.
In other words, this is not a new technology, and lithium batteries can be realized. Of course, manufacturers need to give guidance programs, and individuals should not blindly try.
In addition, spit this:
First, a concept is popularized. The magnitude of the charging current is not simply determined by the charger, but by the internal resistance of the battery and the voltage difference between the charging voltage and the current voltage of the battery. The internal resistance of the lithium battery is small, milliohm level. If the current limit is not used, the battery or the charger will be damaged. (The battery voltage of the battery is 3.2V. If the charging voltage is 5V, there will be no current limit. How much will it be? Short circuit), so the charger has a limited current circuit. The so-called current limiting circuit is actually a pulse width modulated DC-DC. Its working principle is to adjust the output voltage through pulse width modulation. To be precise, the current limiting is to reduce (limit) the output voltage to reduce the charging current. purpose. The traditional charger is basically a nominal 5V output, and the OPPO's charger is equal to the initial 4.5V output. This is really meaningless. The initial voltage is lower than 4.5V. As the battery's own voltage rises, it will gradually Increase the charging voltage.
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