Dual-Mode Battery State Detection for Vehicle Assembly
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Solution Overview
Problem
Existing secondary battery state detecting devices inaccurately assess the state of secondary batteries during vehicle assembly due to poor contact between the battery terminals and the detection device, leading to unnecessary battery exchanges.
Innovation Solution
A secondary battery state detecting device with dual operation modes: an initial mode for detecting the battery's state upon connection and a normal mode for stable detection using terminal voltage and charge/discharge current, with the ability to notify workers of abnormal states and using average or maximum values for accurate assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If state detection is performed during vehicle assembly when battery contact may be poor, then detection coverage is improved, but measurement precision deteriorates leading to false abnormal judgments
Solution Approach 1:
The system performs preliminary detection actions by storing multiple terminal voltage values detected during the vehicle assembly period before making a final abnormality judgment. This preliminary data collection allows the system to account for poor contact conditions that occur during assembly without triggering false alarms.
Solution Approach 2:
The system detects terminal voltages at multiple time points (excessive detection) rather than a single measurement, and uses only the necessary portion of these measurements (the maximum value) for the final judgment. This excessive detection ensures that at least one valid measurement is obtained even when contact is poor during assembly.
2Productivity
If state detection is performed when electric power is supplied to load, then operational monitoring is improved, but measurement precision deteriorates due to voltage drops
Solution Approach 1:
The system performs preliminary detection during the vehicle assembly period when the battery is not supplying power to loads, storing voltage values obtained under these ideal conditions. This preliminary detection establishes a baseline for normal battery voltage before operational conditions introduce confounding factors.
Solution Approach 2:
The system changes the detection parameter by selecting the maximum voltage value from multiple measurements taken under different conditions (including during load operation). This parameter selection strategy ensures that the final judgment is based on the most favorable measurement, effectively filtering out transient voltage drops caused by load operations.
3Reliability
If multiple voltage measurements are taken to account for poor contact, then reliability is improved, but loss of time increases due to multiple measurements
Solution Approach 1:
The system performs multiple voltage measurements (excessive action) during the vehicle assembly period but uses only the maximum value among these measurements for the final abnormality judgment. This approach ensures detection reliability by capturing at least one valid measurement while limiting the time impact through selective data usage.
Solution Approach 2:
The system performs multiple measurements as a preliminary action during vehicle assembly when time is not critical, storing these values for later evaluation. This preliminary data collection phase separates the measurement process from the judgment process, allowing comprehensive data gathering without directly impacting production timeline.
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 secondary battery states, reducing unnecessary exchanges by distinguishing between unstable and stable conditions, and preventing misjudgment of normal batteries as abnormal.
Implementation Method 1
detects an initial state of the secondary battery with reference to a terminal voltage of the secondary battery
Implementation Method 2
detects the state of the secondary battery at a normal time based on the terminal voltage and a charge/discharge current of the secondary battery
Data Source
Figure 1
Figure 2
Figure 3(A)~3(F)
AI summary
[Summary] [Object] To accurately detect a state of a secondary battery when the secondary battery is mounted on a vehicle. [Organization] In a secondary battery state detecting device 1 detecting a state of a secondary battery 14 which is mounted on a vehicle, a first operation mode being an initial operation mode in a case newly connected to the secondary battery and a second operation mode being a normal operation mode after the first operation mode are included, and an initial state detecting unit (control part 10) which makes the operation mode transit to the first operation mode, and detects an initial state of the secondary battery with reference to a terminal voltage of the secondary battery in a case connected to the secondary battery; and a normal state detecting unit (control part 10) which makes the operation mode transit to the second operation mode, and detects the state of the secondary battery at a normal time based on the terminal voltage and a charge/discharge current of the secondary battery at a predetermined timing after the state of the secondary battery is detected by the initial state detecting unit are included.