Battery Module Top-Cover Temperature Sensing Under Safe Mounting Pressure
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Solution Overview
Problem
Conventional temperature sensing assemblies in battery modules are prone to failure due to excessive pressure during mounting, leading to inaccurate temperature sensing and premature power limitation, especially under high-power conditions where the temperature difference between the connection piece and the battery interior is significant.
Innovation Solution
A battery module design featuring a temperature sensing assembly with a thermistor and thermal pad mounted on a wire harness board, pressed closely against the top cover of the battery, providing a short temperature transfer path and accurate temperature response, ensuring reliable and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional temperature sensing assembly is mounted in the battery module, then temperature sensing capability is provided, but the assembly receives excessive pressure during mounting which causes it to fail and be unable to sense temperature properly
Solution Approach 1:
The patent introduces a mounting plate as an intermediary component between the circuit board and the temperature sensing assembly. The mounting plate distributes the pressing force from the circuit board over a larger area, preventing excessive localized pressure on the temperature sensing assembly while still ensuring adequate contact for accurate temperature sensing.
Solution Approach 2:
The mounting plate serves as a cushioning element that is installed beforehand to protect the temperature sensing assembly from excessive pressure. By placing this protective layer in advance, the delicate temperature sensing components are shielded from the full force of the circuit board pressing operation, preventing damage before it occurs.
2Measurement precision
If the temperature sensing assembly is pressed closely against the top cover, then temperature response speed and accuracy are improved, but the assembly is at risk of being crushed under pressure
Solution Approach 1:
The mounting plate acts as an intermediary that enables the circuit board to press the temperature sensing assembly against the top cover while distributing the pressure evenly. This ensures good thermal contact for accurate temperature measurement without concentrating force that could damage the sensing assembly.
Solution Approach 2:
The mounting plate changes the pressure distribution parameter from concentrated high pressure to distributed lower pressure. This allows the temperature sensing assembly to maintain close contact with the top cover for accurate sensing while the pressure on any single point remains within safe limits.
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 design enhances the accuracy and speed of temperature sensing, reducing premature power limitations and optimizing the performance and reliability of the battery module, particularly in high-power conditions, by closely mounting the temperature sensing assembly to the battery top cover, which reflects the internal battery temperature effectively.
Implementation Method 1
a thermal pad, where the thermistor is sandwiched between the mounting portion and the thermal pad, and the thermal pad abuts against the top cover
Data Source
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AI summary
This application discloses a battery module, a battery pack, and a device, and relates to the field of battery technologies, to optimize a structure of the battery module. The battery module includes a battery, a wire harness board, a circuit board, and a temperature sensing assembly. The battery includes a top cover. The wire harness board is disposed on an outer side of the top of the top cover, and the wire harness board includes a body and a mounting portion disposed at the body. The circuit board is connected to the wire harness board. The temperature sensing assembly is mounted at the mounting portion, and pressed by the circuit board closely against the top cover. The battery module provided in the foregoing technical solution not only effectively implements temperature sensing at the top cover, but also prevents the temperature sensing assembly from being damaged due to excessive force applied by the circuit board, effectively increasing reliability of sensing a temperature by the temperature sensing assembly, and also increasing operating reliability of the battery module.