Battery Module Temperature Sensor Contact Recess Design
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Solution Overview
Problem
The detection precision of temperature information in battery modules drops when foreign matter, such as metal chips from laser welding, becomes trapped between the temperature sensor and the secondary battery, leading to improper control of charging and discharging.
Innovation Solution
A battery module design that incorporates a level difference at the contact region between the secondary battery and the temperature sensor, forming a space to accommodate foreign matter, ensuring proper contact and high-precision temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is attached directly to the secondary battery surface, then temperature detection precision should be high, but foreign matter (metal chips from laser welding) becomes trapped between the sensor and battery, causing detection precision to drop
Solution Approach 1:
The patent introduces a protrusion structure on the battery case surface that acts as an intermediary between the temperature sensor and the battery surface. This protrusion creates a dedicated contact region where the temperature sensor can make direct contact with the battery, while the surrounding recessed area prevents foreign matter from interfering with the contact interface. The protrusion structure thus mediates between the need for direct contact (for precision) and the need to exclude foreign matter (for reliability).
Solution Approach 2:
The patent transitions from a two-dimensional flat contact surface to a three-dimensional structured surface with protrusions and recesses. By creating a protrusion that extends from the battery case surface, the patent adds a vertical dimension to the contact interface, allowing the temperature sensor to contact the protruding portion while foreign matter is confined to the recessed surrounding areas. This dimensional change effectively separates the contact function from the foreign matter containment function.
2Ease of manufacture
If the battery case surface is made flat for easy manufacturing, then manufacturing precision is maintained, but foreign matter cannot be effectively excluded from the contact region
Solution Approach 1:
The patent segments the battery case surface into distinct functional zones: a protruding contact region for temperature sensor attachment and surrounding recessed areas for foreign matter containment. This segmentation is achieved through the protrusion structure that divides the surface into different levels, allowing each zone to perform its specific function independently while being integrated into the overall battery case structure.
Solution Approach 2:
The patent applies local quality by creating a protrusion with specific geometric characteristics (height, base area, shape) at the precise location where the temperature sensor will be attached. This localized structural modification provides the necessary foreign matter exclusion function only at the critical contact region, while the rest of the battery case maintains its standard flat surface for ease of manufacturing and assembly.
Data Source
AI summary
A battery module includes a secondary battery, temperature detection unit that detects temperature information about the secondary battery, and a control device that controls charging and discharging of the secondary battery on the basis of the temperature information detected by the temperature detection unit. In the battery module, a level difference (recess) is provided on the surface of at least one of the secondary battery and the temperature sensor such that a space is formed at least at a central portion of a contact region at which the temperature sensor of the temperature detection unit and the secondary battery come into contact with each other. As a result, a space in which foreign matter can be accommodated can be formed, and accordingly the temperature information about the secondary battery can be detected with high precision by suitably bringing the temperature sensor and the secondary battery into contact with each other.