電池充電器原理
每次充電要根據(jù)電池化學(xué)成分按順序施加電壓和電流。因此,充電器和充電算法需滿(mǎn)足不同電池化學(xué)成分的不同要求。電池充電常用術(shù)語(yǔ)包括:用于NiCd和NiMH電池的恒流(CC),和用于鋰離子和鋰聚合物電池的恒流/恒壓(CC/CV) (圖1至6)。
圖1. 半恒流充電,主要應(yīng)用于剃須刀,數(shù)字無(wú)繩電話和玩具
圖2. 定時(shí)器控制充電,主要應(yīng)用于筆記本,數(shù)據(jù)終端,無(wú)線設(shè)備和蜂窩電話
圖3. -DV終止充電方式,主要應(yīng)用于筆記本,數(shù)據(jù)終端,攝錄像機(jī),無(wú)線設(shè)備和蜂窩電話
圖4. -dT/dt終止充電方式,應(yīng)用于電源設(shè)備和電動(dòng)工具
圖5. 涓流充電,主要應(yīng)用于應(yīng)急燈,導(dǎo)引燈和存儲(chǔ)器備份
表3. 充電方式
Chemistry | Charging Method | Feature | No. of Terminals | Charge Time(hours) | Charge Current (CmA) | Trickle Current(CmA) | Charge Level at End of Charge (%) | Figure Reference |
Nickel Based (NiCl and NiMH) | Semi-constant current charging | Most typical system; simple and low cost | 2 | 15 | 0,1 | ---- | ---- | 1 |
Timer-controlled charging | More reliable than semiconstant current system; relatively simple and low cost | 2 | 6 to 8 | 0,2 | 1/20-1/30 | Approx. 120 | 2 | |
-V cut-off charging | Most popular; more complex | 2 | 1 to 2 | 0,5-1 | 1/20-1/30 | Approx. 110 to 120 | 3 | |
T/t cut-off charging | More costly, but overcharge can be avoided enabling longer life cycle that the others | 3 or 4 | 1 to 2 | >1 | 1/20-1/30 | Approx. 100 to 110 | 4 | |
Trickle-charging | Simple and low cost; applicable for continuous long charging | 2 | 15 | 0,1 | ---- | ---- | 5 | |
Lithium Based | Constant current-constant voltage (CC-CV) | Not recommended for the main charge-control system for Ni-Cd /NiMH batteries. Prevailing charge method for Li+ and Li- Polymer batteries.Relatively complex charger design. | 2 | 1 to 3 | 1 | ---- | Approx 100 | 6 |
表4. 不同化學(xué)成分電池充滿(mǎn)的判據(jù)
Chemistry | NiCl | NiMH | Li+ |
Charging | Constant current | Constant current | Constant current/constant voltage |
Full charge detect | -
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