Battery Pack Temperature Sensor Through-Hole Contact
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Solution Overview
Problem
Existing battery packs face challenges in accurately measuring temperature due to inadequate contact between temperature sensors and battery cells, leading to delayed protection circuit activation and potential overheating or explosion risks.
Innovation Solution
A battery pack design featuring a temperature sensor extending through a hole in the case to contact the outer surface of battery cells, with a flexible printed circuit board type and varying intervals for secure adherence, allowing for accurate temperature measurement without additional adhesives or tapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is placed inside the holder case, then the assembly is simple, but the temperature measurement accuracy is insufficient due to inadequate contact with battery cells
Solution Approach 1:
The patent introduces an intermediary structure (the holder case with through-hole and exposing portion) that facilitates direct contact between the temperature sensor and battery cell outer surface. This mediator enables accurate temperature measurement without requiring complex internal sensor placement or additional adhesives, resolving the contradiction between measurement accuracy and device complexity.
Solution Approach 2:
Instead of placing the temperature sensor inside the holder case and relying on indirect heat transfer, the patent inverts the approach by extending the sensor through the holder case wall to make direct contact with the battery cell outer surface. This inversion achieves both accurate measurement and simple assembly.
2Reliability
If additional adhesives or tapes are used to secure the temperature sensor, then the temperature measurement reliability improves, but the assembly process becomes more complex and productivity decreases
Solution Approach 1:
The holder case structure provides self-service functionality by incorporating a through-hole and exposing portion that automatically secure the temperature sensor in the correct position and ensure proper contact with the battery cell. This eliminates the need for additional adhesives or tapes, maintaining high reliability while improving assembly productivity.
3Reliability
If the temperature sensor contacts the battery cell outer surface, then timely temperature detection is achieved, but the holder case structure becomes more complex
Solution Approach 1:
The holder case is segmented into distinct functional regions: a through-hole portion for sensor passage and an exposing portion for sensor contact with the battery cell. This segmentation allows the holder case to maintain structural integrity while enabling timely temperature detection, resolving the contradiction between reliability and structural 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
Enhances temperature measurement reliability and safety by ensuring timely detection of high temperatures, preventing damage and explosions, while simplifying assembly and increasing productivity.
Implementation Method 1
the temperature sensor extending through the insertion area to contact an outer surface of at least one of the battery cells
Data Source
AI summary
A battery pack includes a protection circuit module for a plurality of battery cells arranged in parallel in a case. The protection circuit module includes a temperature sensor. An insertion area is at a location of the case corresponding to the temperature sensor and includes a removed part of the case. The temperature sensor extends through the insertion area to contact an outer surface of at least one of the battery cells.