Battery Bypass Balancing for Inconsistent Energy Storage Packs
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Solution Overview
Problem
Energy storage systems in new energy vehicles, solar power generation, and wind power generation face reduced availability due to battery inconsistency caused by internal resistance and capacity variations, leading to a barrel effect that decreases system capacity and energy storage.
Innovation Solution
An energy storage system comprising M interconnected energy storage batteries with unique controllers that perform a balancing control method. The controllers determine whether to connect or bypass each battery based on state values such as SOC, maximum monomer voltage, and minimum monomer voltage, using communication links to synchronize battery states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery devices are connected to form an energy storage system, then the system capacity and energy storage increase, but battery inconsistency increases due to internal resistance and capacity variation
Solution Approach 1:
The energy storage system is divided into multiple independently controllable battery devices, each with its own controller. This segmentation allows individual battery management while maintaining system-level coordination through communication links, addressing the inconsistency issue by enabling device-level monitoring and control.
Solution Approach 2:
The system dynamically adjusts the connection state of each battery device based on real-time state values (SOC, voltage, temperature) and balancing control. Controllers receive state information from all batteries and dynamically determine connection or bypass status, allowing the system to adapt to changing battery conditions and maintain consistency.
2Reliability
If battery inconsistency increases due to internal resistance and capacity variation, then the barrel effect reduces system available capacity, but maintaining high availability requires complex balancing control
Solution Approach 1:
Each controller obtains state values from its local battery and receives state information from other batteries through communication links. This feedback mechanism enables real-time monitoring of battery inconsistencies and triggers balancing control when needed, maintaining system availability through informed decision-making.
Solution Approach 2:
Communication links serve as intermediaries between controllers, enabling information exchange without direct physical intervention. The controllers process received state information and make connection/bypass decisions, acting as intermediaries that coordinate battery management while reducing the complexity of direct battery-to-battery control.
3Reliability
If controllers continuously monitor and balance battery states, then battery consistency and system availability improve, but communication data transmission and processing requirements increase
Solution Approach 1:
Each controller performs multiple functions: local state monitoring, receiving state information from other batteries, processing balancing control, and controlling connection/bypass operations. This multi-functionality reduces the need for separate dedicated components, minimizing communication overhead while maintaining comprehensive battery management.
Data Source
AI summary
The present application provides an energy storage system, which comprises: M energy storage batteries interconnected and a communication link, where an energy storage battery is provided with a unique controller configured to control a corresponding energy storage battery to connect to or bypass from the energy storage system, where the controller is configured to perform a balancing control method, where the controller is configured to: obtain a first state value of the corresponding energy storage battery, send the first state value to another M−1 controllers based on the communication link, receive second state values sent by another M−1 controllers, and determine whether to connect the corresponding energy storage battery to the energy storage system or bypass it from the energy storage system based on the first state value and the M−1 second state values. Technical solutions in the present application improves availability of an energy storage system.