Battery Cell Heat Suppression Sheet With Evaporative Cooling Gap
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Solution Overview
Problem
Existing battery packs face challenges in maintaining surface temperature within a predetermined range during normal use and effectively cooling battery cells when abnormal high temperatures occur, leading to heat propagation and potential thermal runaway.
Innovation Solution
A heat transfer suppression sheet is interposed between battery cells, comprising a heat-insulating material with inorganic particles or fibers that release moisture upon heating, and a covering material with a gap that communicates with the outside, allowing for evaporation and discharge of heat, thereby cooling the cells during normal use and preventing heat propagation during abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If only a heat-insulating layer is provided between battery cells, then heat propagation between cells is suppressed, but the battery cell cannot be effectively cooled during charge and discharge cycles
Solution Approach 1:
The patent changes the physical and chemical parameters of the heat-insulating material by incorporating substances with different dehydration temperatures. The material transitions from a simple insulator to a multi-functional substance that can cool through dehydration at lower temperatures (normal operation) and provide thermal insulation at higher temperatures (abnormal conditions).
Solution Approach 2:
The patent uses composite materials containing two or more substances with different dehydration temperatures within the heat-insulating layer. This composite structure enables the material to perform both cooling and heat insulation functions simultaneously, resolving the contradiction between heat propagation suppression and cooling capability.
2Temperature
If a heat-absorbing sheet with dehydration substances is used to cool battery cells during normal use, then cooling is achieved, but the sheet cannot effectively suppress heat propagation when abnormal high temperatures occur
Solution Approach 1:
The patent utilizes the temperature-dependent dehydration characteristics of different substances. At normal operating temperatures, substances with lower dehydration temperatures actively cool the battery. When abnormal high temperatures occur, the material structure changes and the heat insulation function becomes dominant, effectively suppressing heat propagation.
3Productivity
If battery cell temperature is allowed to rise to maintain charge and discharge performance, then performance is improved, but thermal runaway risk increases
Solution Approach 1:
The patent incorporates dehydration substances in advance within the heat-insulating layer. These substances are prepared to activate at specific temperature thresholds during normal operation, providing proactive cooling before thermal runaway conditions develop. The preliminary placement of cooling agents ensures rapid response to temperature increases.
Solution Approach 2:
The heat-insulating layer with dehydration substances acts as a cushioning mechanism against thermal runaway. By incorporating substances that dehydrate at different temperatures, the system creates a buffer zone that absorbs excess heat and prevents temperature escalation, cushioning the battery against thermal runaway while maintaining performance.
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
The solution effectively maintains battery cell temperatures within a safe range during normal use and prevents heat propagation during abnormal conditions, ensuring the battery pack's safety and performance by utilizing the heat of vaporization for cooling.
Implementation Method 1
a heat-insulating material containing at least one of inorganic particles or inorganic fibers... at least one of the inorganic particles or the inorganic fibers contained in the heat-insulating material contains a material that releases moisture when heated
Implementation Method 2
heat-insulating material containing at least one of inorganic particles or inorganic fibers
Implementation Method 3
a gap is formed between the heat-insulating material and the covering material, and the gap communicates with the outside of the heat-insulating material and the covering material
Implementation Method 4
a heat-insulating material containing at least one of inorganic particles or inorganic fibers... Heat transfer from one plate member to another plate member is also suppressed by the low thermal conductive layer
Data Source
AI summary
A heat transfer suppression sheet for a battery pack, the heat transfer suppression sheet being used in a battery pack in which battery cells are connected in series or in parallel and being interposed between the battery cells, the heat transfer suppression sheet containing: a heat-insulating material containing at least one of inorganic particles or inorganic fibers; and a covering material covering at least a part of the heat-insulating material, in which a gap is formed between the heat-insulating material and the covering material, and the gap communicates with the outside of the heat-insulating material and the covering material.