Battery Startup Circuit for Undervoltage Disconnect Control
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Solution Overview
Problem
Existing lithium battery energy storage systems face risks of permanent damage due to overdischarge, as current undervoltage protection mechanisms can lead to repeated startup instructions, causing extra power consumption and potential irreversible damage.
Innovation Solution
The proposed energy storage system incorporates a startup circuit with a first control circuit and a second control circuit, including voltage divider circuits, to automatically perform undervoltage protection. This system controls the connection status between the electrochemical cell pack and the auxiliary source circuit based on an external input signal, ensuring that power is only supplied when the battery voltage meets the specified startup voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based undervoltage protection is used, then the system can detect low battery voltage, but repeated startup instructions may cause overdischarge and permanent damage to the electrochemical cell pack
Solution Approach 1:
The patent implements preliminary action by using the voltage divider circuit to detect battery voltage before the startup sequence executes. The circuit proactively identifies undervoltage conditions and prevents startup initiation, thereby avoiding overdischarge damage before it can occur. This is achieved through the voltage divider network that continuously monitors battery voltage and provides feedback to the control logic.
Solution Approach 2:
The patent introduces an intermediary hardware circuit (voltage divider with comparator) between the battery and the startup control system. This intermediary circuit acts as a mediator that translates battery voltage status into actionable signals, providing a physical layer of protection that operates independently of software execution, thus preventing overdischarge through hardware-based voltage threshold detection.
2Reliability
If the startup circuit continuously monitors battery voltage, then overdischarge can be prevented, but the circuit complexity increases with additional voltage divider circuits and control logic
Solution Approach 1:
The patent applies self-service by designing a voltage divider circuit that automatically detects undervoltage conditions and triggers protection without requiring external intervention or complex control logic. The circuit serves itself by using the battery's own voltage to drive the detection mechanism, eliminating the need for additional power supplies or complex monitoring systems.
Solution Approach 2:
The patent uses parameter changes by monitoring voltage threshold parameters through the voltage divider circuit. When the battery voltage parameter drops below a predetermined threshold, the circuit automatically changes state to prevent startup, providing simple yet effective protection through parameter-based control rather than complex logical operations.
3Adaptability or versatility
If the battery supplies power to the auxiliary source circuit during startup, then the system can operate without external power supply, but the battery may undergo overdischarge if voltage protection fails
Solution Approach 1:
The patent implements preliminary action by establishing hardware-based voltage threshold detection before power transfer occurs. The voltage divider circuit pre-assesses battery voltage adequacy and prevents power supply initiation when voltage is insufficient, ensuring independent operation only when safe and preventing overdischarge before it can happen.
Solution Approach 2:
The patent applies feedback by using the voltage divider circuit to continuously monitor battery voltage and provide real-time feedback to the startup control logic. This feedback mechanism ensures that power supply to the auxiliary source circuit only occurs when voltage levels are adequate, maintaining system adaptability while preventing harmful overdischarge conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents overdischarge of the electrochemical cell pack and mitigates the risk of battery pack damage by automatically disconnecting power during undervoltage conditions, thereby ensuring the longevity and reliability of the energy storage system.
Implementation Method 1
the first voltage divider circuit includes a switching device and a voltage divider that are connected in series... When the switching device is turned on, a turn-on voltage of the connection point may generate a turn-on voltage that is lower than a battery voltage of the electrochemical cell pack
Data Source
AI summary
An energy storage system includes an electrochemical cell pack, a startup circuit, and an auxiliary source circuit. The startup circuit includes a first control circuit and a second control circuit, the second control circuit includes a first voltage divider circuit and a second voltage divider circuit that are connected in series, the first voltage divider circuit includes a switching device and a voltage divider that are connected in series, and a connection point between the first voltage divider circuit and the second voltage divider circuit is connected to a first control end of the first control circuit. When the switching device is turned on, a voltage of the electrochemical cell pack needs to meet a specified condition, and the first control circuit turns on a line between the electrochemical cell pack and the auxiliary source circuit, to enable the battery pack to supply power to the auxiliary source circuit.