Battery Pack Gas Ventilation Temperature Measurement
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Solution Overview
Problem
Existing battery packs face challenges in measuring the temperature of gas ventilation passages without directly placing a temperature sensor within the passage, especially when the passage dimensions are reduced for size or performance enhancement.
Innovation Solution
A battery pack configuration where a temperature sensor is positioned on the outer surface of the gas-ventilation-passage defining portions, allowing it to indirectly measure the temperature of the gas ventilation passage by utilizing the heat transferred from the gas passing through, and optionally using a heat transfer member or being adjacent to the battery cells or piping members for enhanced measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the dimension of the gas ventilation passage is reduced to promote size reduction of the battery pack, then the overall size and weight of the battery pack are reduced, but it becomes difficult to dispose the temperature sensor in the gas ventilation passage
Solution Approach 1:
The patent uses the gas-ventilation-passage defining portion (a structural component of the battery pack) as an intermediary medium to transfer heat from the gas inside the passage to the temperature sensor located on the outside. This eliminates the need to install the sensor directly inside the passage, resolving the contradiction between passage size reduction and sensor installation feasibility.
2Adaptability or versatility
If the dimension of the gas ventilation passage is reduced to enhance performance by utilizing spared space for other components, then space utilization is improved, but it becomes difficult to dispose the temperature sensor in the gas ventilation passage
Solution Approach 1:
The patent replaces the direct mechanical placement of the temperature sensor inside the gas ventilation passage with a thermal field-based measurement approach. The sensor measures temperature indirectly through heat conduction via the passage defining portion, eliminating the need for physical access to the interior of the passage and enabling space optimization.
3Measurement precision
If a temperature sensor is disposed inside the gas ventilation passage to directly measure temperature, then measurement precision is improved, but the gas ventilation passage dimension must be increased to accommodate the sensor
Solution Approach 1:
The gas-ventilation-passage defining portion serves as a heat transfer intermediary that conducts thermal energy from the hot gas inside the passage to the temperature sensor on the outside. This indirect measurement approach achieves sufficient temperature detection capability without requiring the passage to be enlarged to fit the sensor.
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
Enables effective temperature measurement of the gas ventilation passage without the need for a sensor inside the passage, allowing for detection of gas exhaustion from relief valves while enabling size reduction and performance enhancement of the battery pack.
Implementation Method 1
heat of the gas increases the temperature of the gas-ventilation-passage defining portions; thus, even the temperature sensor disposed on the side of the outer surface of the gas-ventilation-passage defining portion can indirectly measure the temperature of the inside of the gas ventilation passage via the gas-ventilation-passage defining portion
Data Source
AI summary
A battery pack installed in a vehicle, includes battery cells including relief valves and exhausting gas through the relief valves; gas-ventilation-passage defining portions each of which includes an inner surface and an outer surface, and is provided with a gas ventilation passage on the inner surface side to allow the gas exhausted from the relief valves to pass through the gas ventilation passage; and a temperature sensor disposed on the outer surface side of the gas-ventilation-passage defining portion to measure the temperature of the inside of the gas ventilation passage via the gas-ventilation-passage defining portion.