Non-aqueous Electrolyte Battery Freezing Detection
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Solution Overview
Problem
Conventional methods fail to accurately detect whether a non-aqueous electrolyte in a lithium ion secondary battery is in a frozen state at any given time, leading to potential battery performance deterioration when used in a frozen state.
Innovation Solution
A non-aqueous electrolyte battery system that includes a charge/discharge control section and a freezing determination section, which executes a freezing determination current control by supplying a predetermined current to the battery for a specific time, determining the electrolyte's frozen state based on the voltage transition, rising to a peak and then decreasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage detection method is used to detect frozen state, then detection simplicity is maintained, but detection accuracy deteriorates because it cannot determine whether electrolyte is frozen at any given time
Solution Approach 1:
The system performs preliminary freezing determination by applying a determination current before allowing charge/discharge operations. This preliminary action detects the frozen state in advance, preventing inaccurate operation detection. The determination current application and voltage transition observation are performed as preliminary steps to ensure the electrolyte is in a suitable state for normal operation.
2Reliability
If determination current is supplied frequently to check frozen state, then detection reliability is improved, but battery load increases due to repeated high-current loading
Solution Approach 1:
The freezing determination is performed periodically at specific intervals rather than continuously. The control section supplies the determination current at predetermined periods, balancing the need for reliable detection with the need to minimize energy consumption and battery load. This periodic action ensures the frozen state is checked at appropriate intervals without excessive frequency.
3Productivity
If charging is performed when electrolyte is frozen, then productivity is maintained, but battery performance deteriorates due to lithium deposition
Solution Approach 1:
The system applies preliminary anti-action by detecting the frozen state before charging operations begin and preventing charging when the electrolyte is frozen. The control section observes the voltage transition during determination current application, identifies frozen state conditions, and accordingly prohibits charging or discharging operations, thereby preventing lithium deposition and performance deterioration.
4Speed
If frozen state detection is performed continuously, then detection responsiveness is improved, but system complexity increases due to continuous monitoring requirements
Solution Approach 1:
The system uses periodic action by performing freezing determination at predetermined intervals rather than continuously. The control section supplies the determination current and observes voltage transitions at specific periods, achieving adequate detection responsiveness while avoiding the complexity and energy consumption associated with continuous monitoring.
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
Enables accurate detection of the electrolyte's frozen state, preventing battery deterioration by disabling charging and discharging when frozen, and reducing the frequency of high-current loading on the battery.
Implementation Method 1
determine that the non-aqueous electrolyte is in the frozen state in response to a detection of a transition that rises once to a peak value and then decreases with time exhibited by a voltage output from the battery voltage output section
Data Source
AI summary
A non-aqueous electrolyte battery system includes a battery voltage output section for outputting a voltage of a non-aqueous electrolyte secondary battery and a freezing determination section for performing freezing determination to a non-aqueous electrolyte. In the freezing determination, the freezing determination section executes freezing determination current control for supplying a current at a freezing determination current value at a freezing determination time in a direction to charge the non-aqueous electrolyte secondary battery. When a voltage value output from the battery voltage output section exhibits a transition that rises once to a peak value during execution of the freezing determination current control, and then decreases with time, it is determined that the non-aqueous electrolyte is in a frozen state.