Battery Terminal Temperature Feedback for Laminate Film Durability
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Solution Overview
Problem
All-solid-state battery systems face durability issues due to temperature increases from heat generation or reception, which affect the laminate film covering the cells, leading to reduced durability.
Innovation Solution
A battery system that includes a temperature acquisition device to monitor terminal temperatures and a control device to set upper limits on transmission power based on this information, reducing Joule heat generation and subsequent temperature increases, thereby minimizing the impact on the laminate film's durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmission power is increased to improve power output, then power delivery capability is improved, but terminal temperature increases due to Joule heat generation, reducing laminate film durability
Solution Approach 1:
The control device dynamically adjusts the upper limit value of transmission power based on real-time terminal temperature measurements. When terminal temperature is high, the upper limit is reduced to prevent excessive Joule heat generation; when temperature is low, the upper limit can be increased to allow higher power transmission. This dynamic adjustment resolves the contradiction between maintaining high power output capability and preventing temperature-induced durability degradation of the laminate film.
Solution Approach 2:
The system implements a feedback control mechanism where the acquisition device continuously monitors terminal temperature and feeds this information to the control device. The control device uses this feedback to adjust the transmission power upper limit, creating a closed-loop control system that automatically balances power transmission needs with thermal management requirements, thereby protecting laminate film durability while maintaining power delivery capability.
2Productivity
If transmission power is increased to improve power output, then power delivery capability is improved, but terminal temperature increases, affecting exterior durability
Solution Approach 1:
The system dynamically adjusts the transmission power upper limit based on real-time terminal temperature conditions. This allows the system to operate at higher power levels when thermal conditions permit, maximizing productivity, while automatically reducing power limits when temperature becomes excessive, thereby eliminating the harmful thermal effects on the exterior laminate film.
Solution Approach 2:
The control device changes the operational parameter (transmission power upper limit) based on the thermal state of the terminal. By adjusting this parameter according to temperature measurements, the system optimizes power transmission efficiency while preventing harmful temperature increases that would damage the exterior materials.
3Reliability
If cooling control is applied to reduce terminal temperature, then laminate film durability is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The system employs a self-service control mechanism where the control device automatically adjusts transmission power limits based on temperature feedback without requiring external intervention or complex active cooling systems. The battery management system itself performs the thermal regulation by modulating power transmission, eliminating the need for separate cooling infrastructure and reducing overall system complexity while maintaining laminate film durability.
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
The system effectively reduces the increase in terminal temperature and subsequent durability issues of the laminate film, enhancing the overall performance and longevity of the battery system.
Implementation Method 1
the acquisition device may include a temperature sensor provided for the terminal and configured to detect the temperature of the terminal
Implementation Method 2
a thermistor provided for the terminal of at least one of the cells
Implementation Method 3
An increase in Joule heat generation in the terminal can be reduced by setting the upper limit value to a low value
Data Source
AI summary
The ECU performs a step of determining whether charging/discharging control is being executed, a step of acquiring the temperature of the terminal portion when it is determined that charging/discharging control is being executed, and a step of determining the charging power limit value, a step of setting a discharge power limit value, and a step of performing charge/discharge control using the set charge power limit value and the set discharge power limit value.