Battery Pack Temperature Sensing Layout for Accurate Cell Status
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Solution Overview
Problem
Existing temperature sampling methods in battery packs using negative temperature coefficient thermistors are inaccurate due to the temperature difference between the battery cell shell and the charged parts, affecting charging and discharging performance and reliability.
Innovation Solution
Implementing a battery pack design with first and second temperature measurement elements, where the first element contacts the battery cell shell and the second element contacts the terminal post or busbar device, allowing simultaneous measurement of shell and charged part temperatures, and distributing second elements in end and middle areas to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single temperature sensor is used to measure battery cell temperature, then the device complexity is reduced, but the measurement precision deteriorates due to temperature difference between shell and charged parts
Solution Approach 1:
The temperature measurement function is segmented into two distinct measurement elements: a first temperature measurement element contacting the battery cell shell and a second temperature measurement element contacting the terminal post or busbar device. This segmentation allows independent measurement of different temperature zones, resolving the contradiction by improving measurement precision through multi-point monitoring while keeping each individual measurement element simple.
Solution Approach 2:
Different measurement locations are assigned different measurement elements based on their local thermal characteristics. The first element measures shell temperature while the second element measures charged part temperature, acknowledging that different locations have different thermal properties. This local quality approach improves overall measurement accuracy by capturing spatial temperature variations without requiring a complex unified sensor system.
2Measurement precision
If temperature measurement points are reduced to simplify the system, then the device complexity is reduced, but the measurement precision deteriorates due to insufficient coverage of temperature distribution
Solution Approach 1:
The battery pack is segmented into distinct thermal zones (shell region and charged part region) with dedicated measurement elements for each zone. This segmentation strategy improves measurement precision by ensuring critical temperature points are captured, while maintaining device simplicity by using only two measurement elements rather than extensive sensor arrays.
Solution Approach 2:
The patent uses the existing battery cell shell and terminal post/busbar device as intermediary structures that naturally conduct and represent temperatures from different regions. By placing measurement elements on these existing components rather than adding separate temperature probes throughout the battery, the system achieves comprehensive temperature monitoring with minimal additional complexity.
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
Improves the accuracy of determining the battery cell's operating status, enhancing charging and discharging performance and reliability by comprehensively measuring temperatures at various positions within the battery pack.
Implementation Method 1
the first temperature measurement element arranged in contact with the shell of the corresponding battery cell
Implementation Method 2
the second temperature measurement element arranged in contact with the terminal post of the corresponding battery cell and/or the corresponding busbar device
Data Source
AI summary
A battery pack includes a box, a battery unit, a busbar device, and a temperature measurement device. The temperature measurement device includes at least one first temperature measurement element and at least one second temperature measurement element, the first temperature measurement element is arranged in contact with the shell of the corresponding battery cell, and the second temperature measurement element is arranged in contact with the terminal post of the corresponding battery cell and/or the corresponding busbar device, the at least one second temperature measurement element is located in an end area on one side of the box along the first direction, the at least one second temperature measurement element is located in an end area on the other side of the box along the first direction, and the at least one second temperature measurement element is located in a middle area of the box along the first direction.