Battery Pack Temperature Monitoring With Adaptive BMS Wake-Up Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems (BMS) in electric vehicles unnecessarily switch to wake-up mode to monitor battery pack temperatures, leading to over-discharge and increased power consumption, as they do not have individualized timing for switching between sleep and wake-up modes based on temperature variations across multiple battery modules.
Innovation Solution
A temperature monitoring apparatus with a master BMS and multiple slave BMSs, where each slave BMS switches to wake-up mode at a pre-set time and transmits temperature data to the master BMS, which adjusts the wake-up times of other slave BMSs based on temperature data and patterns, optimizing the cooling process by reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BMS frequently switches to wake-up mode to monitor battery pack temperature, then the temperature monitoring reliability is improved, but the power consumption increases and over-discharge occurs
Solution Approach 1:
The BMS is divided into multiple independent monitoring units, each responsible for monitoring temperature of specific battery modules. Each unit can independently switch between sleep and wake-up modes based on its own temperature monitoring needs, rather than the entire BMS switching simultaneously. This segmentation allows only necessary units to consume power during wake-up periods.
Solution Approach 2:
The wake-up timing of each BMS unit is dynamically adjusted based on real-time temperature data. When temperature is stable and within normal range, wake-up intervals are extended. When temperature changes are detected or exceed thresholds, wake-up frequency increases. This dynamic adjustment optimizes the balance between monitoring reliability and power consumption.
2Reliability
If the BMS monitors all battery modules simultaneously with fixed timing, then the monitoring consistency is improved, but the power consumption increases unnecessarily
Solution Approach 1:
Different battery modules are assigned different monitoring strategies based on their local characteristics. Modules with higher temperature variability or closer to critical thresholds receive more frequent monitoring, while stable modules are monitored less frequently. This localized quality approach ensures consistent safety monitoring while reducing overall power consumption.
Solution Approach 2:
The monitoring parameters (wake-up time intervals) are changed dynamically based on temperature conditions. Instead of fixed timing for all modules, the system adjusts monitoring frequency according to actual temperature states, transforming from a static parameter system to a dynamic one that adapts to real-time conditions.
3Productivity
If the BMS extends wake-up intervals to reduce power consumption, then the energy efficiency is improved, but the temperature monitoring responsiveness deteriorates
Solution Approach 1:
The system implements feedback mechanisms where temperature data from previous monitoring cycles informs future wake-up timing decisions. When temperature readings indicate stable conditions, the system feedbacks to extend wake-up intervals for energy efficiency. When temperature changes are detected, feedback triggers more frequent wake-ups to maintain responsiveness. This closed-loop feedback optimizes both energy efficiency and monitoring speed.
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
Provided are temperature monitoring apparatus and method for a battery pack. The temperature monitoring apparatus includes a plurality of slave battery management systems (BMSs) including a first slave BMS and a second slave BMS; and a master BMS connected to the plurality of slave BMSs to communicate with them. The master BMS sets a next wake-up time of the second slave BMS based on first temperature data indicating a temperature of a first battery module from among a plurality of battery modules and transmitted from the first slave BMS.