Photovoltaic energy storage has become a better solution for the normalization of electricity limit and time -sharing electricity prices, because as a clean and renewable energy, the photovoltaic energy storage system has become one of the main battlefields of the future energy storage system. The distributed system is also an independent network energy storage system. The battery management system, that is, the stability of the BMS system, has become one of the important factors to measure the performance of the energy storage system.

    The BMS system is mainly responsible for the monitoring and management of the working status of the battery system, especially the lithium battery pack system, which is one of the core components of the energy storage system. In terms of design, stability is more important. In the electronic circuit design of the BMS system, we must consider the overall stability and fault tolerance of the system, including the risk treatment measures carried out when the energy storage battery system fails.

     Based on the IEC 61508 and IEC 60730-1 Appendix H, we combed the functional stable design and verification of lithium-ion battery energy storage products. In addition to photovoltaic energy storage products, other forms of electrochemical energy storage systems can also be referenced.

    Based on the risk recognition and risk analysis of the comprehensive management system, we analyze and design from the three main points of determining and stable function distribution, stability integrity, and verification from the overall stability of the energy storage system. , IEC60730-1 and other related reference standards combed the analysis and design process of the conventional battery energy storage system BMS function.

     Through analysis and experiments, it can be found that the influence and diagnosis analysis (FMEDA) and the risk matrix method (RM) of the failure mode of the failure mode, the reliability box diagram (RBD), the risk is controllable. Design principle.

     In design, we need to carefully comply with relevant standards such as IEC 61508, IEC60730-1, and combined with the actual introduction of energy storage system products, adapt to local conditions, select our own design and analysis paths to ensure the stability and integrity of the BMS management system ( SIL) Effectively achieve.

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