Hot-Plug Battery Expansion Circuit for Collision Current Control
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Solution Overview
Problem
Existing portable energy storage systems face challenges with insufficient battery capacity due to low energy density, and current methods for parallel connection of batteries are limited by the need for consistent charge levels to avoid collision currents and power failures, preventing hot-plug functionality.
Innovation Solution
An expandable energy storage system with an inverter system, built-in battery, and external batteries connected via a hot-plug line and switching compensation circuit, which controls the connection and disconnection of external batteries based on charge levels to prevent collision currents and ensure seamless power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If parallel connection of batteries is implemented to increase battery capacity, then the energy storage capacity is improved, but the system reliability deteriorates due to collision currents and power failures when charge levels are inconsistent
Solution Approach 1:
The patent introduces a switching compensation circuit as an intermediary between the first and second batteries. This circuit includes switching tubes and compensation inductors that mediate the connection process, enabling safe parallel connection even when charge levels differ by controlling the switching timing and current flow paths.
Solution Approach 2:
The patent implements preliminary detection of battery charge levels before connection. The controller detects the charge levels of both batteries in advance, determines whether their difference is within the preset range, and only permits connection when conditions are satisfied, preventing collision currents before they occur.
2Duration of action of moving object
If external batteries are connected in parallel to extend operational time, then the duration of action is improved, but the ease of operation deteriorates due to the inability to perform hot-plug operations
Solution Approach 1:
The patent performs preliminary detection of charge level differences before enabling connection. By detecting whether the charge level difference is within the preset range beforehand, the system can safely enable hot-plug operations without causing collision currents, making battery replacement convenient and safe.
Solution Approach 2:
The patent implements dynamic control of the switching tubes based on real-time charge level detection. The switching compensation circuit dynamically adjusts its state according to the charge levels of the batteries, enabling flexible hot-plug operations while maintaining safety through continuous monitoring and adaptive switching control.
3Reliability
If battery charge level consistency is required to prevent collision currents, then the reliability is improved, but the adaptability deteriorates by preventing hot-plug functionality
Solution Approach 1:
The switching compensation circuit acts as an intermediary that enables connection even when charge levels differ slightly. It provides a controlled transition path with compensation inductors that prevent collision currents while allowing the operation to proceed, thus maintaining both reliability and adaptability.
Solution Approach 2:
The patent changes the control parameter from requiring exact charge level equality to allowing a preset range of difference. By adjusting this parameter threshold, the system balances reliability (preventing excessive collision currents) with adaptability (enabling hot-plug operations within acceptable ranges).
Data Source
AI summary
An expandable energy storage system and an expansion method thereof. The system includes an inverter system provided with a built-in battery, external batteries and switching compensation circuit, wherein each of the external batteries is communicatively connected with the inverter system through a hot-plug connection line. Each of the external batteries is further connected with the built-in battery through the switching compensation circuit. The inverter system is configured to turn off a charging tube of the built-in battery and turn on a discharging tube of the built-in battery when the electric quantity of the built-in battery is lower than a preset electric quantity. The switching compensation circuit is configured to control the external battery to be connected with the built-in battery when the electric quantity of the built-in battery is lower than the preset electric quantity and lower than the electric quantity of the external battery.