色噜噜国产精品视频一区二区互动交流_99精热re在线观看_毛片免费在线_日本成本人A片www_国产中文制服丝袜另类_成人三级精品视频在线观看_亚洲无碼熟女寂寞少妇_亚洲欧美日韩字幕_无码av免费中文字幕久久_国产电影日韩欧美

We have studied for so long lithium battery protection board knowledge, and know that lithium battery protection board is used for lithium batteries, in fact, this understanding is wrong, there are many kinds of lithium batteries, there are a variety of different models, And we look at the lithium battery protection board as a core component exists in the lithium battery lithium battery, today's main learning rechargeable lithium battery knowledge. There are a variety of rechargeable lithium batteries, such as lithium - vanadium oxide batteries, lithium - ion batteries and foreign newly developed lithium - polymer batteries. Here only the first two, focusing on lithium-ion battery.
Rechargeable lithium-ion battery is currently the most widely used cell phone battery, but it is more "squeamish", in use can not overcharge, over discharge (will damage the battery or make it scrapped). Therefore, there are protective components on the battery or protection circuit to prevent expensive battery damage. Lithium-ion battery charging requirements are high, to ensure that the termination voltage accuracy within 1%, the current major semiconductor device factory has developed a variety of lithium-ion battery charging IC, to ensure safe, reliable, fast charge. Now the phone is very common, part of the phone is nickel-metal hydride batteries, but the smart phone is a lithium-ion battery. Proper use of lithium-ion batteries is important to extend battery life.
1. Lithium-vanadium oxide battery (Li-V6O13)
Lithium-vanadium oxide battery with lithium as the anode, vanadium oxide as the cathode, inorganic salt of the organic solvent for the electrolyte composition. It is characterized by being able to charge. Taking the No. 2 battery as an example, the lithium-vanadium oxide cell is shown in Table 5 as compared with the lithium-manganese dioxide battery and the lithium-thionyl chloride battery.
It is understood that, because the lithium-vanadium oxide battery rated voltage is only 2.8V, and the rated capacity is also small, so compared with the other two lithium batteries, the specific energy is the smallest. The main parameters of this type of cylindrical battery are shown in Table 6. As can be seen from Table 6, the number of times of charging (cycle life) is not long, so this rechargeable battery soon replaced by lithium-ion battery.
2. Lithium-ion battery (Li-Ion)
Lithium-ion battery is currently the most widely used lithium battery, which according to the requirements of different electronic products can be made flat rectangular, cylindrical, rectangular and button, and there are several batteries in series with the battery pack.
Lithium-ion battery rated voltage of 3.6V (some products are 3.7V). The charge voltage at full charge is related to the battery anode material: the anode material is 4.2V of graphite; the anode material is 4.1V of coke. Different internal resistance of the anode material is also different, the coke anode internal resistance is slightly larger, the discharge curve is also slightly different, as shown in Figure 1. Commonly known as 4.1V lithium-ion battery and 4.2V lithium-ion battery. The discharge voltage of the lithium ion battery is 2.5V ~ 2.75V (the battery factory gives the operating voltage range or gives the termination discharge voltage, the parameters are slightly different). Below the termination of the discharge voltage to continue discharge called over-discharge, over discharge on the battery will be damaged.
Lithium-ion batteries are not suitable for high current discharge, excessive current discharge will reduce the discharge time (internal will produce a higher temperature and loss of energy). So the battery production plant gives the maximum discharge current, in use should be less than the maximum discharge current. Lithium-ion batteries have a certain temperature requirements, the factory gives the charging temperature range, discharge temperature range and storage temperature range. Lithium-ion battery on the charging requirements are very high, it requires precision charging circuit to ensure the safety of charging. Termination of the charging voltage accuracy tolerance of ± 1% of the rated value (for example, charge 4.2V lithium-ion battery, the tolerance is ± 0.042V), over-voltage charging will cause permanent damage to lithium-ion battery. Lithium-ion battery charging current should be based on the recommendations of the battery manufacturers, and require limited current circuit to avoid over-current (overheating). Commonly used charging rate of 0.25C ~ 1C (C is the battery capacity, such as C = 800mAh, 1C charging rate that is charging current of 800mA). In the high current charging often to detect the battery temperature, to prevent overheating damage to the battery or produce an explosion.
Lithium-ion battery charging is divided into two stages: the first constant current charge, to close to the termination voltage to constant voltage charging, the charging characteristics shown in Figure 2. This is a 800mAh capacity battery, which terminates the charge voltage of 4.2V. The battery voltage to 800mA (charge rate of 1C) constant current charging, the beginning of the battery voltage to a larger slope boost, when the battery voltage close to 4.2V, into 4.2V constant voltage charging, the current gradually, the voltage change is not, To the charge current down to 1 / 10C (about 80mA), that is close to full, you can terminate the charge (some charger to 1 / 10C after the start timer, after a certain period of time to end the charge).