Functional safety analysis and design of BMS for lithium-ion battery energy storage system

doi:10.19799/j.cnki.2095-4239.2019.0177

Abstract

Abstract:

During the previous two years, China’s energy storage industry has witnessed explosive growth. Compared with other energy storage technologies, lithium-ion batteries are more competitive due to rapid advances in production technology and a gradual decline in manufacturing costs, and the market penetration rate in the field of energy storage is continuously increasing. As an electronic device for monitoring and managing a battery, the battery management system (BMS) is the core component of an energy storage system. Its functional safety is related to the safe and stable operation of an entire lithium-ion battery power station. To accurately and efficiently implement the design and verification of function safety in the BMS of the energy storage system, the analysis and design of a BMS to achieve functional safety, which is primarily described through system hazard identification and risk analysis, overall safety requirements and safety function allocation, and safety integrity verification, are outlined by incorporating the characteristics of a lithium-ion battery energy storage system BMS according to IEC 61508, GB/T 20438, and other related reference standards. The analysis shows that the failure mode effects and diagnostic analysis, the risk matrix, and the reliability block diagram are suitable for the functional safety analysis and design of the BMS of the energy storage system. Based on the IEC 61508 and IEC 60730-1 standards, combined with the characteristics of the energy storage system, an accurate analysis design ensures that the functional safety integrity level of the energy storage system BMS is effectively achieved. These provide a reference for the design and development of the energy storage power stations.

Key words: battery energy storage system, battery management system, functional safety, functional safety integrity level

CLC Number:

X 956

ZHU Weijie, SHI Youjie, LEI Bo. Functional safety analysis and design of BMS for lithium-ion battery energy storage system[J]. Energy Storage Science and Technology, 2020, 9(1): 271-278.

Figures/Tables 7

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References 22

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序号	危险事件名称	来源	相关安全功能
1	释放可燃、有毒或爆炸性气体	电池化学反应	有害气体监测功能报警功能通风控制功能
2	流出可燃、有毒或腐蚀性液体	电池化学反应	流出液体监测报警功能
3	热失控	电池化学反应	通过结构设计进行防护
4	电芯着火或爆炸	电池化学反应	消防启动功能
5	电芯过热	电池化学反应	过温保护功能
6	电池内短路	电池	电流监测功能
7	电池内阻超出	电池	在线内阻监测功能报警功能

序号	危险事件名称	来源	相关安全功能
8	外短路	PCS或线缆	过流保护 +熔断器(不属于功能安全)
9	地震事件	外部环境	固定、机械强度(不属于功能安全)
10	外部火灾	外部环境	外壳防护(不属于功能安全)
11	滴水	外部环境	外壳防护(不属于功能安全)
12	跌落	外部环境/人为	外壳防护(不属于功能安全)
13	电池由于电池架倒塌受到挤压	外部环境或人为因素	固定(不属于功能安全)
14	操作人员失误	人员	输入防错功能
15	其他人为故意行为	人员	输入安全密码控制功能
16	失去温度控制	BMS	过温保护功能
17	失去电池电压控制功能	BMS	过压保护功能
18	由于失去控制功能或接地故障发生的过放电	BMS	绝缘故障检测功能状态监测功能主接触器控制功能
19	由于失去控制功能或数据漂移或软件错误发生的过充电	BMS	状态监测功能主接触器控制
20	过放后充电	外部指令或人为误操作	状态监测功能主接触器控制功能
21	BMS控制线故障	BMS/外部环境	状态监测功能主接触器控制功能
22	BMS通信中断、错误	BMS/EMS	通讯监测功能
23	电击	外部环境/绝缘故障	接地保护绝缘故障监测功能报警功能

安全完整性等级(SIL)	安全功能的每小时危险失效平均频率(PFH)
4	≥10^-9且<10^-8
3	≥10^-8且<10^-7
2	≥10^-7且<10^-6
1	≥10^-6且<10^-5

组件安全失效分数	硬件裕度
组件安全失效分数	0	1	2
<60%	不允许	SIL1	SIL2
60%~<90%	SIL1	SIL2	SIL3
90%~<99%	SIL2	SIL3	SIL4
>99%	SIL3	SIL4	SIL4

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