CR1625 battery.Technical performance and purchasing tips of battery chargers for mobile phones

　　1. The quality of charger products can be measured from three aspects: working performance, safety requirements and electromagnetic compatibility.

　　1. Working performance. Different types of batteries have different charging requirements. Chargers mainly have charging method, charging current, charging voltage and other parameter requirements.

　　(1) Charging method: It stipulates whether the charger charges the battery in a constant current mode or a constant voltage mode. For the currently commonly used lithium-ion batteries, the charging method of the charger should adopt the current-limiting and constant-voltage method, that is, it first charges with current-limiting to the battery's limited charging voltage and then automatically switches to constant-voltage charging.

　　(2) Charging current: Specifies the maximum output current of the charger. The size of the charging current should match the capacity of the applicable battery, and generally should not be greater than 1C5A.

　　(3) Charging voltage: specifies the maximum output voltage of the charger. The charging voltage depends on the charging limit voltage of the battery; when charging a lithium-ion battery with a nominal voltage of 3.6V, the maximum voltage output by the charger is generally 4.2V (in fact, lithium-ion batteries used in mobile phones are equipped with protection device, so the output voltage of the charger can also be slightly higher than 4.2V, but to ensure safety, the voltage must not be higher than 4.5V).

　　2. Safety requirements. Generally speaking, it requires that the circuit structure, mechanical structure and electrical performance of the product should meet certain safety requirements, regardless of whether the product is in normal working condition or abnormal (such as output overload or short circuit, internal component failure or circuit failure, etc.) state, should not endanger the safety of people and property. In order to achieve this goal, the safety requirements of charger products (such as anti-shock protection performance, insulation performance, temperature, etc.) should comply with the requirements stipulated in the national mandatory standard GB4943-2001.

　　3. Electromagnetic compatibility. For charger products, the electromagnetic compatibility requirements are mainly reflected in electromagnetic disturbance. Electromagnetic disturbance is divided into conductive disturbance and radiation disturbance. Due to the many advantages of switching power supplies, chargers generally use switching power supply circuits. However, the high-frequency turning on and off of the switching devices in the switching power supply will generate high-frequency harmonic signals. These high-frequency signals propagate through the power grid through the power terminals or radiate through space, which will bring electromagnetic pollution to the environment, disturb the normal operation of surrounding electronic equipment, and may even have serious adverse effects on the safe operation of the power grid and human health. Therefore, in order to reduce the electromagnetic pollution of the environment, it is required that the disturbance voltage and radiation disturbance field strength of the power terminal (or interface terminal) of electronic products should be less than a certain limit when the electronic product is working. For mobile phone battery chargers, the harassment voltage and harassment field strength should meet the requirements of the Class B limit in the national mandatory standard GB9254-1998.

　　2. As a consumer, when choosing a charger product with good quality and suitable for use, the following points are for reference:

　　1. When purchasing a charger, you should read the product instruction manual or product marking instructions in detail. Generally speaking, only chargers with product certification marks are safe. Therefore, you should try to purchase products with product certification marks.

　　2. Mobile phone chargers generally have two charging methods, one is to charge with the phone (the charger cooperates with the mobile phone to charge the battery through an electrical connector); the other is to charge the battery through the charging stand. Before purchasing, you should know the type, capacity, and nominal voltage of the battery you are using so that you can choose a suitable charger.

　　3. Currently, most of the batteries used in mobile phones are lithium-ion batteries with only one single cell, a nominal voltage of 3.6V, and a rated capacity of 500mAh to 1000mAh. Lithium-ion batteries have very high requirements for charging current and charging voltage. Excessive charging current or charging voltage will cause great changes in the chemical reaction inside the battery, causing the internal temperature to rise, causing damage to the electrodes and diaphragm materials or expansion of the battery. explode. Although, generally mobile phone batteries are equipped with protectors with overcharge, over-discharge, and over-current protection functions. However, for safety and to achieve better charging effect, you should choose a charger with a maximum output voltage of 4.2V~4.5V and a maximum output current of 600mA~700mA. Standard charger products should indicate their range of use, output voltage, output current and other technical parameters. If possible, you can use the appropriate measurement range of a multimeter to measure the charger's output no-load voltage and output short-circuit current when purchasing to determine whether the actual data are consistent with the marked technical parameters.

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