通信工程文献翻译——摘要: 提出了一种基于恒流2恒压(CC2CV) 充电模式的锂电池充电器. 在CC2CV 充电模式下,充电器先给电池提供大的充电电流;在电池电压尚未到达饱和之前,充电电流便开始减小;电池电压达到饱和并保持恒定之后,充电电流进一步减小. 这种充电方法,能够避免在电池电压的饱和值附近仍对电池进行大电流充电,从而导致过热现象.对这块充电器芯片核心电路的创新设计,保证了这种CC2CV 充电模式的实现. 本芯片采用CSMC 公司016μm 的CMOS 工艺流片. 测试结果验证了本文提出的CC2CV 充电模式的实现. 充电完成后,锂电池电压为4.11833V.。

1．介绍

由于具有很多的优点，锂离子电池已经成为最广泛使用的可充电电池。充电管理电路的研究在实际应用方面还是很有意义的。锂离子电池充电器集成电路的开发需要几个阶段。在为了避免在充电过程中电池过热，最早的充电器芯片只提供一个恒定的，而且较小的充电电流，并由手动终止。这需要很长时间才能完成一个充电周期。此外，人工终止也因为它可能导致低效率的充电或过充电而降低了可靠性。Cope等科学家提出了充电应用程序，它使用一个恒定的大充电电流来缩短充电时间。然而，大电流充电不仅容易使电池过充，还有可能加速电池中可用的化学反应，最终导致电池过热，降低了电池的容量和循环寿命。

恒流恒压（CC- CV）的充电模式[2，3]已经被作为改进的恒流充电方式来使用。在这种条件下，直到恒定电流的电池电压上升到预定值时才能被应用，换而言之，就是达到饱和电压，那么，当充电电流逐渐减小时，电池电压保持不变。当电流达到最低值时，充电周期完成。这种方法是恒定电流的充电方法更准确。恒流恒压充电方法的特征图如图1（a）所示。然而，这种方法也有缺点。当电池电压接近其饱和值时，对于电池内部可供化学反应的材料数量会降低。如果仍提供电池以较大的充电电流，快速充电可能......

Abstract : A design f or a Li2ion batte ry cha rge r IC t hat can ope rate in a const ant current2constant voltage (CC2 CV) cha rge mode is p rop osed. In t he CC2CV charge mode ,t he charge r IC p rovides a constant charging current at t he beginning , and t hen t he cha rging current begins t o decrease bef ore t he battery voltage reaches its final value . Afte r t he battery voltage reaches its final value and remains constant ,t he charging current is f urt her reduced. This app roach p revents cha rging t he battery wit h f ull current near its saturated voltage , which can cause heating. The novel design of t he core of t he cha rger IC realizes t he p rop osed CC2CV cha rge mode . The chip was implemented in a CSMC 016μm CMOS mixed signal p rocess. The expe rimental results verif y t he realization of t he p rop osed CC2 CV charge mode . The voltage of t he battery after charging is 411833V . Key words : Li2ion batte ry charge r ; constant current2constant voltage cha rge modes; CMOS analog circuit

1 Introduction Lit hium2ion batteries have become t he most widely used rechargeable batteries due to t heir many advantages. Research on charge management circuits is meaningf ul for practical use. The Li2ion battery charger IC developed in several p hases. In order to avoid the overheating of batteries during t he charging process ,t he earliest charger IC only supplied a constant but small charging current ,and was terminated manually. It required a long time to complete a charge cycle. Moreover , manual termi2 nation lowers t he reliability , because it may result in inefficient charge or overcharge. Cope et al . [ 1 ] proposed a charging app roach t hat uses a constant , large charging current to shorten the charge time. However ,a large charging current not only makes a battery susceptible to overcharge ,but may also o2 verdrive the available chemical reactions in t he bat2 tery ,resulting in heating and finally reducing the capacity and cycle life of t he battery. The charge met hod with constant current2con2 stant voltage (CC2CV) modes[2 ,3 ] has been employed.......