目录

摘要

充电过程

18650规格书分享

---

摘要

应用：笔记本电脑、智能手机等设备。

优点：较高能量密度和较长使用寿命，放电率低，可进一步延长充电间隔时间。

缺点：过度充电或者放电会产生不可逆的损伤，性能降低。高温环境下容易爆炸或者着火。

 （图片来源网上）

充电过程

锂电池充电基本包含以上阶段，分别为：

1、涓流充电，此时充电电流非常小；

2、欲充电，Vbat缓慢增加；

3、恒流充电，也称CC充电，此时充电电流较大，一般持续到接近满充电压；

4、恒压充电，也称CV充电，若以单节锂电池4.2V电压举例，恒压充电模式固定为4.2V，充电电流会逐渐减小；

5、当充电电流小到某一个值时，充电结束。

之所以会有专卖的充电芯片，就是为了实现控制上述阶段，芯片监控充电电流，电压，甚至有温度监测、过压保护、短路保护等功能，从而更好的适应各种应用场景。

18650规格书分享

Characteristics

7.1 Standard Charge
    This "Standard Charge" means charging the cell with charge current       1500mA and constant voltage 4.2V at 25℃ for 3hours.

7.2 Standard Discharge Capacity
    The standard discharge capacity is the initial discharge capacity of the cell, which is
measured with discharge current of 440mA with 2.75V cut-off at 25℃ within 1 hour after the standard charge.
             Standard Discharge Capacity    ≥ 3000mAh

7.3 Initial internal impedance
Initial internal impedance measured at AC 1kHz after rated charge.
              Initial internal impedance    ≤ 100mΩ

7.4 Temperature Dependence of Discharge Capacity
      Capacity comparison at each temperature, measured with discharge
constant current 440mA and 2.75V cut-off after the standard charge is as follows.

特点

标准
这种“标准充电”是指在25℃下以1500mA的充电电流和4.2V的恒压对电池充电3小时。

标准排放能力

标准放电容量是电池的初始放电容量，即
在标准充电后1小时内，在25℃下以440mA的放电电流和2.75V的截止电压测量。
标准放电容量≥3000mAh

初始内部阻抗

额定充电后在交流1kHz下测量的初始内部阻抗。
初始内部阻抗≤100mΩ

放电容量的温度依赖性

每种温度下的容量比较，用放电测量
标准充电后的恒定电流440mA和2.75V切断如下。

Temperature Dependence of Charge Capacity       Capacity comparison at each temperature, measured with discharge constant current
440mA and 2.75V cut-off after the standard charge is as follows. 

充电容量与温度的关系各温度下的容量比较，用放电恒流测量
440mA, 2.75V标准充电后截止如下。

Note: If charge temperature and discharge temperature is not the same,             the interval for temperature change is 3 hours.
Percentage as an index of the capacity at 25℃(=2900mAh) is 100%. 

 注:当充电温度和放电温度不一致时，换温间隔为3小时。
百分比作为25℃(=2900mAh)容量的指标为100%。

Charge Rate Capabilities
Discharge capacity is measured with constant current 440mA and 2.75V cut-off after the cell is charged with 4.2V as follows.

充电速率功能

电池充电4.2V后，恒流440mA，截止电压2.75V，放电容量测量如下:

 Discharge Rate Capabilities
Discharge capacity is measured with the various currents in under table and 2.75V cut-off after the standard charge.

放电速率

放电容量是用表下的各种电流和标准充电后的2.75V截止来测量的。

Storage Characteristics       Capacity after storage for 30days at 25℃ from the standard charge,       measured with discharge current 1500mA with 2.75V cut-off at 25℃.

Capacity retention(after the storage) ≥ 2320mAh (80% of the capacity at 25℃)

7.10 Status of the cell as of ex-factory
      The cell should be shipped in 50% charged state. In this case, OCV is from 3.65V to
3.85V.

存储特性标准充电后，在25℃条件下储存30天的容量，在25℃条件下以2.75V截止电流1500mA放电测量。

容量保持(储存后)≥2320mAh(25℃时容量的80%)

7.10电池出厂时的状态
电池应在50%充电状态下运输。在这种情况下，OCV从3.65V到
3.85 v。

尺寸