Battery Charging Circuit Activation Using Wake-Up Voltage Checks
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Solution Overview
Problem
Battery overcharge poses a significant safety risk, particularly in lithium batteries, leading to thermal runaway and potential fires, especially when the charging circuit is activated before the vehicle is started, causing large current discharge and switch sticking issues.
Innovation Solution
A circuit control method that acquires an apparatus wake-up signal and determines if the power source terminal voltage and its change rate meet specific thresholds, ensuring the charging circuit is only turned on when the vehicle is started, and includes additional conditions such as state of charge, fault alarms, and battery temperature to prevent overcharge and over-discharge, thereby enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging circuit is activated before the vehicle is started, then the battery can be charged in advance, but large current discharge occurs causing switch sticking and potential thermal runaway
Solution Approach 1:
The patent applies preliminary action by checking the wake-up signal status before activating the charging circuit. The control method verifies that the vehicle has been properly started (wake-up signal present) before allowing charging to begin, preventing the scenario where charging activates prematurely and causes large current discharge and switch sticking issues.
Solution Approach 2:
The patent implements feedback by continuously monitoring the wake-up signal state and using it to control the charging circuit's activation. The system reads the wake-up signal status and adjusts the charging circuit accordingly - keeping it off when the vehicle is not started and enabling it only when the wake-up signal confirms proper vehicle operation, thus preventing thermal runaway and switch sticking.
2Reliability
If multiple control conditions are added to prevent overcharge, then battery safety is improved, but the control system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control conditions into distinct, modular checks: wake-up signal status, power source terminal voltage threshold, and change rate threshold. Each condition is evaluated independently in sequence, making the complex control logic more manageable and easier to implement while maintaining comprehensive safety coverage.
Solution Approach 2:
The patent uses preliminary action by performing voltage and change rate threshold checks before activating the charging circuit. By verifying all safety conditions (wake-up signal, voltage threshold, change rate threshold) in advance, the system ensures battery safety without requiring complex real-time monitoring during charging operation.
Data Source
AI summary
Provided are a circuit control method, a battery controller, a battery management system, a battery, an electrical apparatus, and a vehicle. The circuit control method includes: acquiring an apparatus wake-up signal; determining whether a power source terminal voltage of a charging circuit of a battery on the apparatus is greater than a first threshold and whether a change rate in a first time length is less than a second threshold, wherein the charging circuit is a circuit connecting the battery on the apparatus and a generator, and the power source terminal voltage is an output voltage of the generator; and issuing a first instruction when the power source terminal voltage of the charging circuit of the battery on the apparatus is greater than the first threshold and the change rate in the first time length is less than the second threshold, so that the charging circuit is turned on.