Battery Pack Inertia Sensor Current Interruption
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Solution Overview
Problem
Battery packs in electric vehicles face challenges in determining whether excessive discharge current is due to legitimate load requirements or systematic errors, leading to potential damage when high current is continuously supplied, especially when the vehicle is stationary.
Innovation Solution
Incorporating a battery management system (BMS) with an inertia sensor and GPS receiver to monitor discharge current, determine the moving state of the load, and control the discharge current by turning off the discharge switch when the current exceeds a critical value for a preset time, while also utilizing an alarm and power-saving measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery pack supplies large discharge current to meet load demands, then the power output is improved, but the risk of damage from systematic errors increases
Solution Approach 1:
The BMS performs preliminary assessment of discharge current requirements by analyzing inertia sensor data to predict legitimate high-current scenarios before they occur. This allows the system to prepare appropriate response strategies in advance, distinguishing between anticipated legitimate demands and potential error conditions before damage can occur.
Solution Approach 2:
The system continuously monitors discharge current and compares it against critical thresholds, using feedback loops to detect abnormal patterns. When discharge current exceeds the first critical current value for the preset time period, the BMS receives real-time feedback and automatically interrupts the discharge to prevent damage, creating a closed-loop safety mechanism.
2Reliability
If the BMS continuously monitors discharge current to detect errors, then the system safety is improved, but the energy consumption increases
Solution Approach 1:
The monitoring system dynamically adjusts its operation based on discharge current conditions. The BMS activates intensive monitoring only when discharge current reaches the first critical current value, and deactivates it when current is below this threshold. This dynamic adaptation allows continuous safety monitoring capability while minimizing energy consumption during normal low-current operation.
Solution Approach 2:
The system changes the monitoring parameter state based on operating conditions. When discharge current is below the first critical current value, the BMS reduces monitoring intensity to save energy. When current exceeds the threshold for the preset time period, the BMS switches to high-intensity monitoring mode, changing the operational parameters of the monitoring system to match the risk level.
3Reliability
If the BMS interrupts discharge current when exceeding critical values, then the system protection is improved, but the power delivery capability deteriorates
Solution Approach 1:
The BMS applies partial interruption of discharge current rather than complete shutdown in all cases. When discharge current exceeds the first critical current value for the preset time period, the system interrupts only the excessive portion while allowing legitimate current to continue flowing. This partial action approach maintains necessary power delivery for legitimate loads while protecting against systematic errors.
Solution Approach 2:
The discharge current control is segmented into different operational zones based on critical current thresholds. The BMS divides the current range into safe operating regions and protection-triggered regions, allowing uninterrupted power delivery in safe zones while applying protective interruption only when current exceeds the first critical current value for the preset time period, thus maintaining productivity during normal operation.
Data Source
AI summary
A battery pack includes a battery, a battery management system (BMS), and an inertia sensor. The battery includes at least one battery cell to supply electricity to a load. The BMS monitors voltage and current states of the battery and to control charge and discharge operations of the battery. The BMS determines a moving state of the load based on inertia information from the inertia sensor and outputs a control signal to interrupt flow of a discharge current of the battery when the discharge current is equal to or greater than a first critical current value for a preset time period and the load is determined to be stationary.