一個設計師的指導（李鋰離子）電池的充電

2453872 2017-05-09 | rar | 0.25 MB | 次下載 | 免費

資料介紹

一個設計師的指導（李鋰離子）電池的充電

　　鋰離子（李離子）電池的優勢鞏固了他們的地位作為便攜式電子產品的主要動力源，盡管有一個缺點，設計師不得不限制充電速率，以避免損壞電池和創建一個危險。幸運的是，今天的李離子電池更強大，可以收取更迅速地使用“快速充電”技術。

　　本文仔細看看李離子電池的發展，電化學的最佳充電周期，以及一些快速充電電路。本文將解釋加速充電的缺點，使工程師能夠作出明智的選擇他們的下一個充電器的設計。

　　The concept behind lithium-ion （Li-ion） batteries is simple but it still took four decades of effort and a lot of research dollars to develop the technology that now reliably powers the majority of today’s portable products.

　　The earliest cells were fragile and prone to overheating during charging， but development has seen those drawbacks overcome. Nonetheless， recharging still needs to follow a precise regimen that limits charge currents to ensure full capacity is reached without overcharging with its associated risk of permanent damage. The good news is that recent developments in materials science and electrochemistry have increased the mobility of the cell’s ions. The greater mobility permits higher charge currents and speeds up the “constant current” part of the charging cycle.

　　These developments enable smartphones equipped with the latest generation of Li-ion batteries to be charged from around 20% to 70% capacity in 20 to 30 minutes. A brief battery refresh to three-quarter-capacity appeals to time-poor consumers， opening up a market sector for chargers that can safely support quick charging. Chip vendors have responded by offering designers ICs that facilitate various charging rates to accelerate battery replenishment for Li-ion cells. Faster charging is the result， but as always， there is a trade-off to be made.