Battery Cell Temperature Sensing With Shared ADC Channels
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Solution Overview
Problem
Existing battery management systems face challenges in detecting abnormal temperature rises in battery cells, particularly in cells without temperature sensors, leading to potential thermal runaway and safety risks.
Innovation Solution
An apparatus and method for measuring battery cell temperatures that utilize a processor and multiple temperature sensors connected through a minimal number of channels, allowing for the detection of temperature abnormalities across many battery cells with reduced component costs and increased convenience in data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are attached to all battery cells, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Multiple temperature sensors are connected to a single ADC circuit through a shared channel, merging the sensing function across multiple cells while using a common readout path. This reduces the number of ADC circuits from N (one per cell) to 1 (shared by all cells), directly resolving the contradiction between comprehensive temperature monitoring and system complexity
Solution Approach 2:
The single ADC circuit is designed to serve multiple temperature sensors through time-multiplexed or sequential measurement, making it a universal component that performs the conversion function for all battery cells rather than being dedicated to a single cell. This universal approach reduces component count while maintaining full measurement capability
2Measurement precision
If temperature sensors are attached to all battery cells, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The ADC circuit resources are merged into a single shared unit that serves all temperature sensors, eliminating the need for N separate ADC circuits. This consolidation directly reduces material costs and assembly complexity, addressing the manufacturing cost issue while preserving complete temperature monitoring capability across all battery cells
3Device complexity
If a minimal number of channels are used, then device complexity is reduced, but measurement precision deteriorates due to blind spots
Solution Approach 1:
The system dynamically switches between different temperature sensors connected to the single ADC channel, sequentially measuring each sensor's output over time. This dynamic time-multiplexed approach allows one channel to effectively monitor multiple cells without blind spots, resolving the contradiction between channel minimization and comprehensive measurement coverage
Solution Approach 2:
The ADC circuit periodically samples each temperature sensor in sequence, creating a periodic measurement cycle that covers all battery cells. This periodic action ensures that every cell is measured at regular intervals, maintaining measurement precision across all cells while using only a single channel, thus eliminating blind spots
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
This solution minimizes blind spots in temperature measurement, quickly detects abnormal temperatures, and secures user evacuation time by efficiently monitoring the temperatures of many battery cells with a minimal number of channels, thereby enhancing safety and reducing costs.
Implementation Method 1
a first temperature sensor that detects whether a temperature of an individual battery cell included in all or some of a plurality of battery cells exceeds a threshold temperature
Data Source
AI summary
An apparatus for measuring a battery cell temperature includes a memory that stores a program instruction, a processor that executes the program instruction, and a plurality of first temperature sensors that detects whether temperatures of all or some of a plurality of battery cells exceed a threshold temperature. The first temperature sensor may correspond to an individual battery cell included in all or some of the plurality of battery cells in an N:1 relationship, where N may be a natural number greater than or equal to 1 and represent a number of the first temperature sensor, and 1 represents a number of individual batteries. The processor may collect data related to the temperatures of all or some of the plurality of battery cells based on detecting whether a temperature of the individual battery cell exceeds the threshold temperature through at least one of the plurality of first temperature sensors.