Rectifier Feedback Control for Li-Ion Battery Safety
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Solution Overview
Problem
Conventional emergency power supply systems using lithium ion secondary batteries face reliability issues and battery life deterioration due to improper charge and discharge management, especially when replacing lead storage batteries without changing the system configuration.
Innovation Solution
A power supply device with a rectifier that converts alternating current to direct current and includes current sensors to control output current based on load and battery state, preventing excessive charge currents and ensuring safe charge and discharge operations without a special charger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a lead storage battery is replaced with a lithium ion secondary battery without changing the system configuration, then battery capacity and energy density are improved, but reliability deteriorates due to improper charge and discharge management
Solution Approach 1:
The patent implements a feedback control mechanism where the rectifier monitors the charge current to the lithium ion battery and adjusts its output accordingly. The rectifier reduces or stops charging when the battery reaches full charge or when discharge current is being supplied, preventing overcharge and ensuring safe operation. This feedback loop resolves the contradiction by enabling high-capacity lithium ion batteries to operate reliably within the existing emergency power supply configuration.
2Ease of operation
If float charging is performed without current control, then battery charging is simplified, but battery life deteriorates due to excessive charge current
Solution Approach 1:
The rectifier dynamically adjusts its output current based on real-time battery state and system conditions. During float charging, the rectifier continuously monitors and controls the charge current to prevent excessive charging that would reduce battery life. When the battery is fully charged or when discharge is occurring, the rectifier automatically reduces or stops charging current. This dynamic control maintains charging simplicity while extending battery life through intelligent current management.
3Device complexity
If no current sensor feedback is implemented, then system complexity is reduced, but charge and discharge safety deteriorates
Solution Approach 1:
The patent incorporates current sensors that provide feedback to the rectifier, enabling real-time monitoring and control of charge and discharge currents. This feedback mechanism allows the rectifier to detect when the battery is fully charged or when discharge current is being supplied, and automatically adjust its output to prevent overcharge and ensure safe operation. The feedback system maintains battery safety while integrating seamlessly into the existing emergency power supply configuration.
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
This solution allows for safe and reliable charge and discharge operations of lithium ion batteries in emergency power systems, preventing battery deterioration and extending battery life without altering the existing system configuration.
Implementation Method 1
a rectifier configured to convert an alternating current power from a system into a direct current power
Data Source
AI summary
Provided is a power supply device including a rectifier configured to convert an alternating current power from a system into a direct current power and supply the direct current power to a power storage device and a load, and a current sensor configured to detect one or both of a first direct current from the rectifier to the load and a second direct current from the rectifier to the power storage device, in which a measurement result of the current sensor is configured to be fed back to the rectifier to control an output current of the rectifier.