Battery Pack Thermistor Placement for Fewer Collection Ports
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Solution Overview
Problem
Existing battery packs face challenges in accurately monitoring temperature distribution and reducing the complexity of temperature collection ports, which increases size and cost, while ensuring thermal safety and efficiency.
Innovation Solution
The battery pack is designed with thermistors positioned on specific cells based on their temperature characteristics, reducing the number of collection ports by strategically placing them on cells with the highest and lowest temperatures and highest temperature change rates, and integrating them with a simplified wiring system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sampling point is set in each cell of the battery pack, then temperature sampling accuracy is improved, but the quantity of collection ports increases and complicates connections of collection wire harnesses
Solution Approach 1:
The patent extracts the temperature monitoring function from every cell and concentrates it on only three representative cells (front, middle, rear). Instead of placing sampling points in all cells, the solution takes out the monitoring requirement and implements it selectively on critical cells that represent the temperature characteristics of the entire battery pack, thereby reducing collection ports while maintaining effective temperature monitoring.
Solution Approach 2:
The patent uses the temperature characteristics of three representative cells as copies that reflect the overall temperature state of the entire battery pack. By monitoring these three cells, the system obtains a copy of the thermal state information without needing to directly measure every cell, thus simplifying the collection system while preserving monitoring accuracy.
2Measurement precision
If a sampling point is set in each cell of the battery pack, then temperature sampling accuracy is improved, but the size and costs of the battery pack increase
Solution Approach 1:
The patent extracts the temperature monitoring requirement from all cells and implements it on only three representative cells. This extraction reduces the number of collection ports and associated wiring components, thereby reducing the overall volume and cost of the battery pack while maintaining effective temperature monitoring capability.
Solution Approach 2:
Instead of fully monitoring every cell (excessive action), the patent applies partial monitoring to only the three most critical cells that represent the temperature distribution characteristics. This partial action is sufficient to ensure thermal safety and accuracy without the overhead of complete cell-by-cell monitoring.
3Device complexity
If thermistors are disposed on top cover surfaces of cells at a front end, the middle, and a rear end, then the quantity of collection ports is reduced, but temperature sampling coverage must be optimized
Solution Approach 1:
The patent applies local quality by placing thermistors at specific locations (front, middle, rear cells) that have distinct temperature characteristics. Each location represents a different thermal zone within the battery pack, and the selective placement ensures that the temperature sampling captures the local quality variations across the entire pack without requiring universal coverage.
Solution Approach 2:
The three strategically placed thermistors create a representative copy of the overall temperature distribution. By selecting cells at front, middle, and rear positions, the system obtains a copied thermal profile that reflects the entire battery pack's temperature state, maintaining sampling coverage accuracy with fewer sensors.
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 enhances temperature sampling accuracy, reduces the size and cost of the battery pack, and improves thermal management by detecting potential risks early, thereby prolonging the battery's service life and ensuring safety.
Implementation Method 1
a thermally conductive adhesive is provided between the thermistor and a top cover surface of a cell on which the thermistor is disposed
Implementation Method 2
thermistors are disposed on top cover surfaces of cells
Data Source
AI summary
A battery pack. The battery pack is configured to accommodate a battery module, and the battery module includes a plurality of cells. In the embodiments, thermistors are disposed on cells at a front end, the middle, and a rear end in the plurality of cells respectively, to learn of a temperature range of the entire battery pack and a temperature change rate of the battery pack, so that detection accuracy of a temperature of the battery pack can be ensured while quantities of collection components and collection ports in the battery pack are reduced.