Cell Core Temperature Determination via Wall Measurement
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Solution Overview
Problem
Existing energy storage devices, such as those in hybrid vehicles, face challenges in accurately determining cell core temperatures due to temperature differences between the cell core and wall, leading to inefficient cooling and potential overheating, which can reduce service life and performance.
Innovation Solution
A method to determine cell core temperature by measuring wall or pole temperatures, using volumetric heat calculations based on internal resistance, current, and cell geometry, and applying Laplace transformations to analyze frequency domains for precise temperature prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If temperature sensors are placed on the cell wall or cell pole to measure temperature, then the measurement is easy to implement, but the temperature measurement provides only inadequate information about the actual temperature within the cell core
Solution Approach 1:
The patent uses the cell wall or cell pole temperature as an intermediary measurement point to indirectly determine the cell core temperature. By measuring the temperature at the accessible cell wall or pole and using it as a basis for calculation, the system avoids direct core measurement while still obtaining accurate core temperature data through the established temperature relationship model.
Solution Approach 2:
The patent replaces direct physical temperature measurement at the cell core with a computational approach. Instead of mechanically inserting sensors into the cell core, the system uses electronic processing to calculate the core temperature based on wall/pole temperature measurements and heat generation data, substituting a computational model for direct physical measurement.
2Reliability
If the cell is actively cooled to maintain maximum temperature below the limit temperature, then the service life of the energy store is extended, but the cooling system consumes additional energy and reduces overall efficiency
Solution Approach 1:
The patent implements a feedback control system where the calculated cell core temperature continuously informs the cooling system operation. The control unit monitors the determined core temperature and adjusts cooling activation and intensity accordingly, creating a closed-loop system that responds to actual thermal conditions rather than operating continuously or based on inaccurate wall temperature readings.
Solution Approach 2:
The patent makes the cooling system dynamic by basing its operation on real-time calculations of heat generation and core temperature. The cooling activation and intensity are continuously adjusted according to the current operational state, heat generation rate, and determined temperature, allowing the system to adapt to varying thermal conditions rather than operating statically.
3Ease of operation
If the wall temperature of the cell is used to determine cell core temperature, then the measurement is straightforward, but the current wall temperature cannot be used to draw sufficiently precise conclusions about the cell core temperature due to thermal inertia and varying heat generation
Solution Approach 1:
The patent performs preliminary calculations of heat generation based on electrical parameters (current, voltage, internal resistance) before using the wall temperature to determine core temperature. By pre-calculating the heat generation component and combining it with the measured wall temperature, the system compensates for thermal inertia effects and varying heat generation conditions, improving the accuracy of core temperature determination.
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 approach allows for accurate determination of cell core temperatures, enabling optimized cooling strategies that prevent overheating while maximizing performance, thus extending the lifespan and efficiency of energy storage devices.
Implementation Method 1
some cells of the energy storage device can be fitted with temperature sensors, e.g. on the cell wall or on the respective cell pole
Implementation Method 2
The cell is cooled via its cell wall or cell pole
Data Source
AI summary
The invention relates to a method for determining a core cell temperature of an energy store, wherein the energy store comprises at least one cell, wherein a temperature of the cell is measured; wherein a volumetric heat is determined; wherein the core cell temperature is determined based on a geometry of the cell. The invention further relates to a corresponding device and a vehicle having such a device.