Mobile phone charger circuit schematic and charger safety standards 1 Safety requirements and test methods for mobile communication handset lithium batteries 1.1 General requirements This standard makes some suggestions on the circuit and structural design of the battery, hoping that manufacturers can fully consider the safety of the battery in the battery design process. 1.1.1 Insulation and wiring, unless the battery electrode terminal is connected to the metal shell of the battery. (Common battery cases are non-metallic, but some batteries also use metal cases. In the latter case, the insulation resistance between the battery electrode terminal and the metal case of the battery should be greater than 5M when measured at a DC voltage of 500V. Mobile phone batteries are not a simple combination of battery cells. There are protection circuits and control circuits outside the battery cells. The internal wiring and insulation should fully meet the expected maximum current, voltage and temperature requirements. The wiring arrangement should ensure that there is enough clearance and insulation penetration distance between the terminals. The overall performance of the internal connection should fully meet the safety requirements when misoperation may occur. 1.1.2 Discharge Discharge means that the excessive pressure inside the battery or battery cell is released at the safety valve to prevent it from rupture or explosion. The standard requires that the battery or battery cell can release the pressure at a certain rate when the internal pressure reaches a certain limit to prevent the battery from rupture, explosion and spontaneous combustion. If the battery cell of the battery is encapsulated in a casing, the form and method of the packaging should not cause the battery to overheat during normal operation, nor should it restrict the release of internal pressure. |[pic] || | Large picture 1.1.3 Temperature/current management During battery charging, the circuits inside the battery and charger will generate heat. If the heat is not well dissipated, the heat will accumulate, which will affect the normal chemical reaction process of the battery and cause thermal failure of the battery. Therefore, the battery design should be able to prevent abnormal temperature rise. If necessary, the battery charging and discharging should be set with a safe current limit to prevent excessive current from generating too much heat. 1.1.4 Terminal connection The battery casing should clearly indicate the polarity of the terminal. The size and shape of the terminal should ensure that it can carry the expected maximum current. ……
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