摘要：在日常生活中，锂离子电池得到了广泛的应用。然而因为锂电池的能量密度高，难以确保其安全性，是以设计一款低功耗高精度的锂电池保护电路具有很强的适用性。

本设计是一款用于对锂离子电池进行充放电保护的电路。该保护电路使用单片机检测充放电电路的电压信息，交由单片机内部AD转换处理后，通过继电器来控制锂电池充放电电路的断开与闭合，并将充放电状态用液晶显示屏显示出来。该电路能够在电池电压过低时切断放电开关，电池电压过高时切断充电开关。整个电路具有锂电池过充、过放保护的基本功能。92688

本文设计的保护电路整体结构简单，具备对锂离子电池充放电状态的实时处理，并且实际实验效果良好，具有一定的应用价值。

毕业论文关键词：MSP430F149，锂电池，保护电路

Abstract：Lithium-ion batteries have been widely used in our daily life。 However, because of the high energy density of lithium battery, it is difficult to ensure the security of the lithium battery, so it is very suitable to design a low power and high precision lithium battery protection circuit。

This design is a lithium-ion battery charging and discharging protection circuit。 The protection circuit uses the single chip microcomputer to detect the voltage of the charging and discharging circuit。 Through the internal analog to digital conversion, the lithium-ion battery charging and discharging circuit is controlled by two relays, and the charging and discharging state is displayed by a liquid crystal display screen。 The circuit can cut off the discharge switch when the battery voltage is too low, and cut off the charging switch when the battery voltage is too high。 The circuit has the basic functions of overcharge and over discharge protection。

The protection circuit designed in this paper is simple in structure, has the real-time processing of the state of charge and discharge of lithium-ion battery, and has a good effect in practice。 The protection circuit has fixed application value。

Keywords:msp430f149,li-ion battery, protective circuit

目录

1 绪论 4

1。1 课题背景及意义 4

1。2 锂电池保护电路的现状 4

1。3 锂电池保护电路的发展趋势 4

1。4 设计任务及要求 5

2 保护电路设计方案及原理 5

2。1 总体设计方案 5

2。2 单片机的选型 6

2。3 显示模块的选型 7

2。4 继电器的选型 8

3 硬件电路设计 8

3。1 MSP430F149单片机最小系统 8

3。2 电源模块 9

3。3 充放电检测与控制模块 9

3。4 LCD1602显示模块 10

4 系统软件设计 11

4。1 系统软件开发环境 11

4。2 总体及各模块流程图 12

5 焊接与实物调试 15

5。1 电路焊接 15

5。2 硬件测试 16

5。3 系统测试 16

结论 18