Battery Output Power Prediction Using Representative Temperature
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Solution Overview
Problem
Existing methods for predicting battery output power require multiple temperature sensors and complex processes, leading to increased costs and inefficiencies.
Innovation Solution
A battery system that predicts output power based on the temperatures of some battery cells using a main control circuit to determine a representative temperature from module and air temperatures, reducing the need for extensive sensor deployment and simplifying the temperature determination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature sensors are mounted on each battery cell to measure cell temperature, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the temperature measurement function from individual battery cells and relocates it to the battery module level. By measuring temperature at the module level (which encompasses multiple cells) and using this representative temperature for output power prediction, the system eliminates the need for multiple individual cell sensors, thereby reducing device complexity while maintaining sufficient measurement precision for the application
Solution Approach 2:
The module-level temperature sensor serves multiple functions: it monitors the overall thermal state of the battery module, provides input for output power prediction, and enables thermal management decisions. This multi-functional approach replaces the need for multiple specialized cell-level sensors, reducing both device complexity and manufacturing cost
2Measurement precision
If a complicated process is used to determine battery temperature from multiple measured cell temperatures, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the temperature determination process from the complex multi-cell analysis and simplifies it to a direct module-level measurement approach. By obtaining temperature directly from the battery module sensor rather than processing multiple cell temperature readings, the system maintains adequate temperature determination accuracy while dramatically simplifying the operational process
Solution Approach 2:
Instead of measuring and processing temperatures from all battery cells (excessive action), the patent uses a partial measurement approach by monitoring only the battery module temperature. This partial action is sufficient for output power prediction purposes and eliminates the need for complex data processing from multiple sensors, thereby improving ease of operation
Data Source
AI summary
Provided are a method for predicting output power of a battery and a battery system providing the same, the system including: a battery including a plurality of battery modules each including a plurality of battery cells; and a main control circuit determining a representative temperature corresponding to a battery temperature based on a plurality of module temperatures which are respective temperatures of the plurality of battery modules, a cooling water temperature which is a temperature of cooling water flowing between the plurality of battery modules, and an air temperature, and predicting an output power value of the battery based on a state of charge SOC of the battery that is determined based on the determined representative temperature and a predetermined reference.