Battery Pack Impact Detection With Axis-Specific Thresholds
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Solution Overview
Problem
Portable power storage packs used in electric vehicles are prone to impacts during handling, which can exceed safe limits, necessitating a high-accuracy impact detection system to ensure safety and prevent damage.
Innovation Solution
A three-axis accelerometer sensor-based impact detection device with a dedicated impact detection circuit that compares acceleration values across different axes, setting unique thresholds based on the mechanical characteristics of the power storage pack to differentiate between acceptable and unacceptable impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-axis accelerometer sensor is used to detect impact on the battery pack, then impact detection capability is provided, but detection accuracy is insufficient because uniform thresholds cannot account for directional mechanical characteristics
Solution Approach 1:
The patent applies local quality by setting different threshold values for different axes (X, Y, Z) based on the specific mechanical characteristics of the battery pack in each direction. The control unit stores and compares acceleration values against axis-specific thresholds, allowing each dimension to have customized safety parameters that reflect its unique structural properties and impact resistance.
2Adaptability or versatility
If the power storage pack is made portable for user carrying, then versatility and convenience are improved, but the risk of impact damage increases due to handling and dropping
Solution Approach 1:
The patent implements preliminary action by pre-storing threshold values for each axis in the control unit before impact occurs. The system is pre-configured with safety parameters that reflect the battery pack's mechanical characteristics, enabling immediate comparison and judgment when impact acceleration is detected, thus providing proactive safety protection rather than reactive response.
3Reliability
If fixed battery packs are used in vehicles, then safety is maintained, but charging time increases due to inability to exchange packs quickly
Solution Approach 1:
The patent applies feedback by having the control unit continuously monitor acceleration sensor outputs and compare them against stored threshold values. When impact exceeds the threshold, the system provides immediate feedback through impact detection signaling, enabling real-time safety assessment that allows portable packs to be used with confidence equivalent to fixed installations.
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 impacts outside the safe range, preventing unsafe usage and potential damage by activating safety controls and recording impact data for analysis, while minimizing power consumption.
Implementation Method 1
an impact detection device to be mounted on a power storage pack, including a three-axis accelerometer sensor
Data Source
AI summary
In impact detection device to be mounted on power storage pack, an impact detection circuit compares detection values of three axes output from a three-axis accelerometer sensor with thresholds set to different values according to mechanical characteristics of power storage pack, and detects an impact outside an allowable range. For example, power storage pack includes wound cylindrical cells, and a threshold of an axis in a direction along a winding axis may be set to a value smaller in absolute value than thresholds of other two axes.