Battery Management System SOC Difference Control
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Solution Overview
Problem
In energy storage systems for vehicles, battery packs connected in parallel often have different state of charge (SOC) levels, leading to the risk of overcharging and potential fires or explosions, especially with lithium-ion batteries, and existing solutions increase costs due to the need for multiple components for current control.
Innovation Solution
An energy storage system with a battery management system that measures SOC levels across battery packs and uses transistor units to control charging and discharging, maintaining a reference difference value to prevent overdischarge, by adjusting the state of charge and current levels for each pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components are used for current control to prevent overdischarge, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The battery management system automatically monitors SOC levels and controls charging/discharging currents without external intervention. The system self-regulates by comparing SOC values and adjusting transistor units to maintain SOC differences within reference ranges, preventing overdischarge while minimizing component requirements.
Solution Approach 2:
The system dynamically adjusts charging and discharging current parameters based on real-time SOC measurements. By changing current levels according to SOC differences between battery packs, the system prevents overdischarge without requiring complex mechanical or electrical control components.
2Productivity
If battery packs are charged simultaneously in parallel, then productivity is improved, but reliability deteriorates due to SOC differences causing overcharge risk
Solution Approach 1:
The battery management system continuously measures SOC levels of all battery packs and uses this feedback to control charging and discharging operations. When SOC differences exceed reference values, the system adjusts current distribution to maintain safety while allowing parallel operation, thus preserving productivity without compromising reliability.
Solution Approach 2:
The system dynamically adjusts charging and discharging currents for each battery pack based on real-time SOC conditions. By making current levels variable rather than fixed, the system enables safe parallel charging of multiple battery packs with different SOC states, maintaining both productivity and safety.
Data Source
AI summary
An energy storage system including battery packs having a first terminal electrically connected to a first node and a second terminal electrically connected to a second node and configured to receive power from an external device or configured to provide power to the external device through the first and second nodes and a battery management system controlling the battery packs. Each battery pack includes batteries and a transistor unit electrically coupled between the batteries and the first node. The battery management system includes a measuring unit for measuring a state of charge (SOC) of the batteries of each battery pack, and a controller configured to calculate a high value, a low value, an average value, and a difference value between the high and low values from the measured SOCs, and configured to control the transistor units of the battery packs, based on the calculated high, low, average, and difference values.