Battery Cluster Regulation for SOC Balancing in Energy Storage
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Solution Overview
Problem
Traditional energy storage systems face challenges due to differences in state of charge (SOC) between battery clusters, leading to reduced constant power operation capability.
Innovation Solution
A regulating system that includes a first power converter connected in series with each battery cluster and a control unit that communicates with the power converter and each battery cluster, allowing for the disconnection of parallel connections between target battery clusters and other clusters, and the control of connections between target battery clusters and the power converter to conduct, thereby regulating the target battery cluster to match the SOC of other clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple battery clusters are directly connected in parallel to the DC side of the power converter, then the system structure is simple, but the SOC differences between battery clusters reduce the constant power operation capability
Solution Approach 1:
The patent divides the battery system into multiple independent battery clusters, each equipped with its own power converter. This segmentation allows independent control and SOC balancing of each cluster, eliminating the SOC differences that plague parallel-connected systems while maintaining structural simplicity through modular design.
Solution Approach 2:
The patent implements dynamic SOC balancing by enabling each battery cluster to independently adjust its charge/discharge rate through its dedicated power converter. This dynamic adjustment capability ensures that SOC differences between clusters are continuously eliminated, maintaining optimal constant power operation capability under varying operating conditions.
2Reliability
If each battery cluster is equipped with an independent power converter, then the SOC balancing capability is improved, but the device cost and heat dissipation cost increase
Solution Approach 1:
The patent designs the power converter as a multi-functional device that simultaneously performs power conversion, SOC balancing, and monitoring functions. By integrating multiple functions into a single device, the patent avoids the need for separate balancing circuits and monitoring systems, thereby reducing overall device cost and heat dissipation requirements while maintaining superior SOC balancing capability.
Data Source
AI summary
A regulating system includes a first power converter and a control unit. Multiple battery clusters of the battery system share the first power converter, and the control unit is connected to the first power converter and each of the battery cluster in communication. The control unit disconnects the parallel connection between the target battery cluster and other battery clusters, controls the connection between the target battery cluster and the first power converter to conduct, and sends a target current command to the first power converter to regulate the target battery cluster.