Battery Pack Chloride-Ion Inspection for Corrosion and Sensor Faults
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Solution Overview
Problem
Existing inspection systems for battery packs struggle to accurately detect corrosion, particularly when chloride ions from air-cooled environments cause deterioration, leading to malfunction and improper detection.
Innovation Solution
An inspection system incorporating chloride-ion detection sensors with a semiconductor design, including a first electrode, a second electrode, a control electrode, and a reference electrode, which detect chloride ions by measuring electric potential and current changes, and a controller that performs inspections based on detection values in two states to ensure accurate corrosion detection and sensor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air-cooling is used to cool the battery, then cooling efficiency is improved, but chloride ions from the air enter the battery pack causing corrosion
Solution Approach 1:
A cover plate is introduced as an intermediary component between the air cooling system and the battery pack. The cover plate includes an through-hole that allows air flow for cooling while preventing chloride ions from entering the battery pack interior, thus mediating between the cooling requirement and corrosion prevention
2Measurement precision
If chloride-ion detection sensors are installed to detect corrosion, then corrosion detection capability is improved, but sensor malfunction occurs due to chloride ion interference
Solution Approach 1:
The harmful chloride ions are extracted or removed from the air before it enters the battery pack by using the cover plate with the through-hole configuration. This prevents the chloride ions from reaching and interfering with the detection sensors, thereby maintaining both detection accuracy and sensor reliability
3Object-affected harmful factors
If the battery pack structure is sealed to prevent chloride ion entry, then corrosion prevention is improved, but air-cooling efficiency deteriorates
Solution Approach 1:
The cover plate is segmented with a through-hole that creates a selective barrier. The structure is divided into regions that allow air passage for cooling while blocking chloride ion penetration, achieving both cooling efficiency and corrosion resistance through strategic segmentation of the cover plate
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 system effectively detects corrosion in battery packs and identifies sensor malfunctions, enhancing the reliability of chloride-ion detection and allowing for proper maintenance and replacement, thereby preventing battery pack deterioration.
Implementation Method 1
an electric potential of the control electrode changes in accordance with a voltage applied to the reference electrode and a concentration of the chloride ion present in the predetermined gap
Implementation Method 2
an electric current between the first electrode and the second electrode changes in accordance with the electric potential of the control electrode
Data Source
AI summary
An inspection system includes a battery pack accommodating a vehicle battery, intake and exhaust ducts, a chloride-ion sensor disposed inside the pack and detecting a chloride ion, and a controller. The sensor includes first and second electrodes, a control electrode, and a reference electrode. A potential of the control electrode changes according to a voltage applied to the reference electrode and a chloride-ion concentration. An electric current between the first and second electrodes changes according to the potential. The controller includes a processor and a memory. The processor performs an inspection of corrosion of the pack based on a detection value of the sensor in a first state where the voltage is applied to the reference electrode, and inspects the sensor based on the detection value of the sensor in a second state where the voltage is applied directly to the control electrode without intervention of the reference electrode.