Battery Case Guide Portion for Gas Detection and Cooling
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Solution Overview
Problem
Existing battery packs face challenges in efficiently guiding gas produced by secondary batteries to detection sensors and in simplifying the assembly process due to the need for insulating oil contact with oblique surfaces, which complicates the cooling and heat dissipation mechanisms.
Innovation Solution
The design incorporates a guide portion with an oblique surface on the inner case wall to direct gas to a predetermined position for efficient detection and a contact portion that protrudes to interact with a coolant for enhanced heat dissipation, eliminating the need for additional coolant during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery case lid has an oblique surface to lead gas to a predetermined position, then gas detection accuracy is improved, but the assembly operation becomes complicated due to the need to add insulating oil after fixing the lid
Solution Approach 1:
The oblique surface is formed on the battery case lid during the molding process itself, rather than requiring subsequent assembly steps. The insulating oil is pre-filled into the battery case before the lid is attached, so that when the lid with the oblique surface is fixed to the case, the gas guidance function is automatically activated without requiring additional oil addition steps. This preliminary preparation resolves the contradiction by embedding the gas guidance structure in the lid design and pre-positioning the oil, thereby improving gas detection accuracy while maintaining simple assembly operations.
2Measurement precision
If the oblique surface is designed to contact insulating oil for gas guidance, then gas leading function is improved, but the cooling and heat dissipation mechanisms become complicated
Solution Approach 1:
The battery case lid is designed with multi-functionality: it serves both as a structural cover and as a gas guidance component through the integrated oblique surface. The insulating oil serves dual purposes - it provides electrical insulation and simultaneously acts as the cooling fluid that contacts the battery cells for heat dissipation. By making the lid and oil serve multiple functions, the design achieves effective gas leading without adding separate cooling mechanisms, thereby resolving the contradiction between gas leading efficiency and system 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
This configuration improves gas detection accuracy and heat dissipation efficiency while simplifying the assembly process by using the coolant for heat transfer without additional coolant addition.
Implementation Method 1
the guide portion having an oblique portion for, when gas is produced by the electricity storage unit, leading the gas to a predetermined position
Implementation Method 2
a contact portion that protrudes in a direction of the electricity storage unit with respect to the oblique portions of the guide portions and is brought into contact with the coolant
Data Source
AI summary
An electricity storage device has an electricity storage unit and a case that contains the electricity storage unit and a coolant for cooling the electricity storage unit. The case includes guide portions on an inner wall surface above the electricity storage unit, each of the guide portions having an oblique portion for, when gas is produced by the electricity storage unit, leading the gas to a predetermined position; and contact portions each of which protrudes in a direction of the electricity storage unit with respect to the oblique portions of the guide portions and is brought into contact with the coolant.