Lithium-Ion Battery Temperature Control via Multi-Region Sensing
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Solution Overview
Problem
Lithium ion secondary batteries experience nonuniform electrolyte concentration, current density, and temperature distribution due to local differences in the laminated parts of the battery, which are not adequately detected by existing technologies, leading to inefficient control and potential battery deterioration.
Innovation Solution
A battery system with central and side temperature detecting means to monitor the temperature of the laminated parts, allowing for precise control of charge and discharge currents based on temperature differences, using thermocouples or thermistors to detect and manage temperature variations across the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only a predetermined portion of the laminated part is measured by temperature detecting means, then the device complexity is reduced, but the measurement precision is insufficient to detect various nonuniformity occurring in the laminated part
Solution Approach 1:
The laminated part is divided into multiple measurement regions: a first temperature detecting means measures temperature in a first region of the laminated part, while a second temperature detecting means measures temperature in a second region. This segmentation allows comprehensive detection of temperature nonuniformity across different portions of the battery, resolving the contradiction between measurement precision and device complexity by strategically placing sensors in representative locations rather than uniformly distributing them.
2Measurement precision
If multiple temperature detecting means are installed to detect temperature distribution, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Different regions of the laminated part are equipped with temperature detecting means based on their specific thermal characteristics and operational importance. The first temperature detecting means is positioned in a first region while the second temperature detecting means is positioned in a second region, allowing each sensor to monitor the local quality and thermal behavior of its specific region. This approach achieves comprehensive temperature distribution detection without requiring excessive sensors throughout the entire battery structure.
3Reliability
If temperature detection is performed at multiple locations, then the reliability of battery control is improved, but the ease of operation becomes more complex
Solution Approach 1:
The control unit receives temperature information from both the first temperature detecting means and the second temperature detecting means, and uses this feedback to control the battery operation. By comparing temperature data from multiple locations, the control unit can detect temperature nonuniformity and adjust charging/discharging parameters accordingly, improving battery reliability while maintaining ease of operation through automated control algorithms that process the multi-location temperature data.
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
Enables effective detection and control of temperature nonuniformities, reducing battery deterioration by adjusting discharge currents and temperature management, thereby improving battery performance and extending its lifespan.
Implementation Method 1
A battery system with central and side temperature detecting means to monitor the temperature of the laminated parts, allowing for precise control of charge and discharge currents based on temperature differences, using thermocouples or thermistors to detect and manage temperature variations across the battery.
Implementation Method 2
A battery system with central and side temperature detecting means to monitor the temperature of the laminated parts, allowing for precise control of charge and discharge currents based on temperature differences, using thermocouples or thermistors to detect and manage temperature variations across the battery.
Data Source
AI summary
A battery system includes a lithium ion rechargeable battery including a power generating element having a laminated part, a positive electrode extended part, and a negative electrode extended part. The battery system further includes a controller and a detector that detects the temperatures of a central laminated part in the laminated part, and at least one of a positive-side temperature detector that detects the temperatures of a positive side-laminated part in the laminated part and a negative-side temperature detector that detects the temperatures of a negative-side laminated part in the stacked part. The controller controls the lithium ion rechargeable battery using the temperature of the central laminated part, and at least one of the temperature of the positive-side laminated part and the temperature of the negative-side laminated part.