锂离子电池具有绿色、高容量、低成本等优点，被广泛应用于电力电子设备中。但锂离子电池电压、温度过高或低，以及充电电流过大会都影响锂离子电池性能，甚至会引发严重的安全事故。另外近几年国内集成电路行业飞速发展，芯片国产化替代浪潮袭来，自主研发锂离子电池保护芯片具有重要意义。

根据锂离子电池的实际应用需求，提出了保护芯片的设计方案和关键参数设计指标；基于电荷守恒定律，利用电容设计了电池电压检测电路，并采用时序控制开关循环对每节电池电压进行监控，实现了电压比较器的分时复用，可降低电路复杂度并减小版图面积；仅使用一个比较器即可实现电池充、放电电流的交替监测，并具有两段放电电流检测功能，以此提高电池的使用安全；设计了可外设阈值的温度保护电路，拓宽芯片的应用场景；设计了电池串接数量可选电路，可支持4~7节电池应用，便于兼容不同电压等级的系统；此外，为确保芯片正常工作，满足设计指标要求，设计了内部电源、无需启动电路的带隙基准、内部电源欠压保护、振荡器及充放电MOSFET驱动等子模块电路。最终完成多节锂离子电池保护芯片整体电路设计。

 基于SMIC 0.18um BCD工艺对整体电路进行仿真分析，仿真结果表明该芯片的各个功能正常，各项指标参数与预期的要求一致。该设计不仅实现了锂离子电池充放电电压、电流保护，还实现了可外设阈值的充放电温度保护和电池串接数量可选功能。最后对整体电路的版图进行设计，并通过了DRC和LVS检查。其结果验证了所设计多节锂离子电池保护芯片版图的可行性。

Lithium-ion batteries are widely used in power electronics because of their green, high capacity and low cost advantages. However, extreme voltage, current and temperature can affect the performance of lithium-ion batteries and even cause serious safety accidents. In addition, with the international situation and domestic policy support, the wave of chip localization replacement comes, independent research and development of lithium-ion battery protection chip is of great significance.

According to the actual application requirements of lithium-ion batteries, the internal design scheme and key parameter design indicators of the protection chip are designed. Based on the law of conservation of charge, the battery voltage detection circuit is designed by capacitor, and the timing control switch is used to monitor the voltage of each battery in turn, which realizes the time-sharing multiplexing of the voltage comparator, which can reduce the complexity of the circuit and reduce the layout area. Only one comparator can realize the alternating monitoring of battery charging current and discharge current, and has a two-stage discharge current detection function, so as to improve the safety of battery use. A temperature protection circuit with peripheral threshold is designed to broaden the application scenarios of the chip. The optional circuit of battery series connection is designed, which can support 4~7 battery applications, which is convenient for compatibility with systems with different voltage levels. In addition, in order to ensure the normal operation of the chip and meet the design specifications, sub-module circuits such as internal power supply, bandgap reference without start-up circuit, internal power supply undervoltage protection, oscillator, and charge-discharge MOSFET driver are designed. Finally, the overall circuit design of multi-cell lithium-ion battery protection chip was completed.

Simulation analysis of the overall circuit based on SMIC 0.18um BCD process, the simulation results show that the chip's various functions are normal and the index parameters were consistent with the expected requirements. The design not only allowed the normal charge and discharge overvoltage protection and charge and discharge overcurrent protection of Li-ion battery, but also realizes the charge or discharge temperature protection and battery series connection number selectable function with external threshold. Finally, the layout of the overall circuit was designed and passed the DRC and LVS checks. The results verify the feasibility of the designed multi-cell lithium-ion battery protection chip layout.

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