Battery Voltage Sensing Modes for Vehicle Overdischarge Prevention
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Solution Overview
Problem
Batteries, particularly lithium-based ones, face the challenge of overdischarge due to continuous power supply to battery monitoring integrated circuits (BMICs) even when not supplying power to loads, leading to energy consumption and potential overdischarge.
Innovation Solution
An overdischarge preventing apparatus and method that includes a sensor to measure battery voltage and a controller to determine the operation state of a charging and discharging relay, adjusting the sensor's operation mode based on vehicle stop status and voltage levels to conserve energy and prevent overdischarge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BMIC continuously measures battery state information (temperature, voltage, current), then the battery monitoring function is maintained, but the battery may be overdischarged due to continuous energy consumption
Solution Approach 1:
The patent applies dynamics by making the BMIC operational state adjustable between different modes (active monitoring, reduced monitoring, and sleep modes) based on battery state. The controller dynamically switches the BMIC between these modes depending on whether the battery voltage is above or below threshold values, allowing the system to adapt its energy consumption to the actual monitoring needs while preventing overdischarge.
Solution Approach 2:
The patent changes the operational parameters of the BMIC by adjusting its measurement frequency and activation state based on battery voltage levels. When voltage is sufficient, the BMIC operates in normal monitoring mode with frequent measurements. When voltage drops below thresholds, the controller reduces measurement frequency or puts the BMIC in sleep mode, thereby changing the energy consumption parameter to prevent overdischarge while maintaining essential monitoring capability.
2Measurement precision
If the sensor operates in wake-up mode with frequent voltage measurements, then accurate battery voltage information is obtained, but energy is consumed at a higher rate
Solution Approach 1:
The patent implements periodic action by switching between different measurement cycles based on battery state. In wake-up mode, the sensor performs voltage measurements in a first (shorter) cycle for high precision monitoring. When the battery enters eco-mode, the measurement cycle is extended to a second (longer) cycle, reducing measurement frequency and energy consumption. This periodic adjustment of measurement intervals allows the system to maintain accuracy when needed while conserving energy during normal operation.
Data Source
AI summary
An overdischarge preventing apparatus for preventing a battery pack provided in a vehicle from being overdischarged includes a sensor configured to measure a voltage of a main battery provided in the battery pack according to an operation mode; and a controller configured to determine an operation state of a charging and discharging relay connected to the main battery, and control the operation mode of the sensor based on at least one of the determined operation state of the charging and discharging relay, information as to whether the vehicle is stopped, and the voltage of the main battery measured by the sensor.