Battery Assembly AC Heating for Internal Temperature Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Managing thermal properties of battery storage systems, particularly in low temperature conditions, is challenging due to limited charging and discharging capabilities.
Innovation Solution
A thermal management system using a quasi-resonant circuit to apply alternating current signals to battery assemblies for temperature estimation and control, enabling rapid and uniform heating by calculating resistance and capacitance based on response parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermal management systems are used for battery heating, then heating capability is provided, but system complexity increases and uniformity of heating deteriorates
Solution Approach 1:
The existing electronic circuit components (inductor, capacitor, switches) are made to serve dual purposes: their primary function for power conversion and an secondary function for temperature estimation and heating control. This eliminates the need for separate dedicated heating components, reducing overall system complexity while providing effective thermal management.
Solution Approach 2:
The battery assembly itself is used as the heating element by passing AC current through it, utilizing its internal resistance to generate heat. This self-heating approach eliminates the need for external heating devices, simplifying the system architecture while achieving uniform temperature distribution throughout the battery.
2Measurement precision
If conventional temperature measurement methods are used, then temperature monitoring is provided, but measurement accuracy of internal temperature deteriorates
Solution Approach 1:
The patent uses electrical parameters (impedance, resistance) as intermediary measurements to indirectly determine the internal temperature of the battery. By measuring the battery's electrical response to AC signals and correlating this with temperature-dependent electrical properties, the system achieves accurate internal temperature estimation without requiring direct thermal contact sensors inside the battery.
Solution Approach 2:
The patent replaces mechanical/thermal measurement methods (physical temperature sensors inside the battery) with electrical measurement methods. By using electrical impedance spectroscopy and analyzing the battery's response to AC signals, the system non-invasively measures internal temperature with high accuracy, avoiding the complexity of inserting physical sensors into the battery assembly.
3Speed
If rapid heating is achieved through high power AC current, then heating speed improves, but temperature control precision deteriorates
Solution Approach 1:
The system continuously monitors the battery's electrical response parameters (impedance, resistance) during AC current application and uses this feedback to estimate real-time temperature. This temperature estimation feedback is then used to dynamically adjust the AC current parameters (amplitude, frequency, duty cycle), enabling rapid heating while maintaining precise temperature control through closed-loop regulation.
Solution Approach 2:
The patent employs dynamic adjustment of AC signal parameters (amplitude, frequency, pulse width) based on real-time temperature estimation. By continuously adapting the heating power delivery to match the battery's instantaneous thermal state, the system achieves both rapid heating response and precise temperature control, avoiding the trade-off between speed and precision.
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
Facilitates accurate internal temperature measurement and uniform heating of battery systems without complex heating systems, utilizing existing electronic components.
Implementation Method 1
a circuit configured to generate an alternating current (AC) signal through the battery assembly... applying an AC current to the battery assembly to heat the battery assembly
Implementation Method 2
calculate one or more response parameters based on the response, the one or more response parameters including a calculated resistance of the battery assembly, and estimate the internal temperature based on the calculated resistance
Data Source
AI summary
A device for parameter estimation and thermal control of a battery assembly includes a thermal management module electrically connected to the battery assembly, the thermal management module including a circuit configured to generate an alternating current (AC) signal through the battery assembly. The device also includes a controller configured to estimate an internal temperature of the battery assembly based on a response of the circuit and the battery assembly to the AC signal, the AC signal including at least one pulse having a selected amplitude and a selected pulse width. The controller is configured to apply the AC signal to the battery assembly via the thermal management module, detect the response, calculate one or more response parameters based on the response, the one or more response parameters including a calculated resistance of the battery assembly, and estimate the internal temperature based on the calculated resistance.