Battery Pack Sensor Layout for Shared Cell Temperature Monitoring
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Solution Overview
Problem
The one-to-one correspondence of temperature sensors with battery cells in battery packs increases the cost without adequately addressing the need for accurate temperature measurement, especially in compact and high-performance battery packs.
Innovation Solution
Implementing a battery pack design where temperature measurement devices are shared among multiple battery cells, with a configuration that includes at least one device for every two adjacent cells, allowing contact with either the shell or terminal posts and busbar devices, thereby reducing the overall number of sensors while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are arranged in one-to-one correspondence with battery cells, then temperature measurement coverage is improved, but battery pack cost increases
Solution Approach 1:
The patent merges the temperature measurement function for multiple adjacent battery cells into a single temperature sensor. Specifically, one temperature sensor is designed to simultaneously measure temperatures of multiple battery cells by positioning it to detect thermal fields from several cells, thereby reducing the total number of sensors needed while maintaining adequate temperature monitoring coverage
Solution Approach 2:
The temperature sensor is designed with multi-functionality to serve multiple battery cells simultaneously. A single sensor placement can monitor temperature data for several adjacent cells, making the sensor universal across multiple measurement points rather than dedicated to a single cell, thus reducing component quantity
2Quantity of substance
If the number of temperature measurement devices is reduced, then battery pack cost decreases, but temperature measurement accuracy may deteriorate
Solution Approach 1:
The patent transitions from a one-to-one correspondence model to a many-to-one model in temperature measurement. By redesigning the spatial relationship between sensors and battery cells, multiple cells share a single sensor, changing the dimensional mapping from bijective to many-to-one, which reduces sensor quantity while preserving measurement capability through strategic positioning
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 measurement accuracy and reduces costs by evenly distributing temperature sensors, improving the reliability and performance of battery packs.
Implementation Method 1
the temperature measurement device is in contact with the shell of the corresponding battery cell, or alternatively, the temperature measurement device is in contact with at least one of the terminal post of the corresponding battery cell and a busbar device electrically connected to the terminal post
Data Source
AI summary
A battery pack includes a box, a battery unit, a busbar device, and multiple temperature measurement devices. At least one battery unit is located in the box, the battery unit includes at least two battery cells, a busbar device is provided between every two adjacent battery cells of the corresponding battery unit, the busbar device is electrically connected to terminal posts of the corresponding two adjacent battery cells respectively, the multiple temperature measurement devices are located in the box, and a number of the temperature measurement devices is no less than ½ of the number of the battery cells and no more than ⅔ of the number of the battery cells.