Battery Pack Heat Suppression Sheet With Steam-Venting Gaps
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Solution Overview
Problem
Existing battery packs struggle to maintain normal temperature levels during use and effectively cool battery cells when abnormal high temperatures occur, leading to thermal runaway and heat propagation between cells.
Innovation Solution
A heat transfer suppression sheet with a heat-insulating material containing inorganic particles or fibers that release moisture upon heating, featuring gaps that allow air exchange and steam discharge, effectively cooling the battery cells during normal and abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 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 cycle
Solution Approach 1:
The sheet structure is divided into different regions with distinct functions: heat-insulating portions for blocking heat propagation and cooling portions for active cooling. This local differentiation allows the same component to address both heat isolation and heat dissipation needs in different areas.
Solution Approach 2:
The sheet integrates multiple functions into a single component: it provides both heat insulation and cooling capabilities. The cooling portions contain moisture that evaporates to cool battery cells, while the heat-insulating portions prevent heat propagation, making the sheet a multi-functional safety component.
2Temperature
If a heat-absorbing sheet with dehydration substances is used, then cooling during normal use is achieved, but the complexity of material composition increases
Solution Approach 1:
The cooling portions are designed with porous structures that facilitate moisture storage and evaporation. The porous material provides large surface area for evaporative cooling while maintaining a relatively simple overall sheet structure, avoiding the need for complex multi-layer compositions.
3Object-affected harmful factors
If gaps are formed in the heat-insulating material, then steam discharge is enabled during abnormality, but heat insulation performance may be reduced
Solution Approach 1:
The sheet is segmented into distinct functional regions: heat-insulating portions that maintain thermal barrier properties and cooling portions with gaps for steam discharge. This segmentation allows gaps to be strategically placed only where needed for venting, while the majority of the sheet maintains continuous heat insulation.
Solution Approach 2:
The cooling portions act as intermediary elements between the battery cell and the external environment. They provide a controlled path for steam discharge while the surrounding heat-insulating portions maintain the thermal barrier, mediating between the need for venting and the need for insulation.
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 sheet maintains low temperatures during normal use through air insulation and evaporative cooling, while preventing heat propagation and thermal runaway during abnormalities by discharging heated steam, thus ensuring safe and efficient battery operation.
Implementation Method 1
a heat transfer suppression sheet with a heat-insulating material containing inorganic particles or fibers that release moisture upon heating
Implementation Method 2
radiant heat from the first power storage element to the second power storage element or radiant heat from the second power storage element to the first power storage element is blocked by the first plate member and the second plate member
Implementation Method 3
Heat transfer from one plate member to another plate member is also suppressed by the low thermal conductive layer
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Provided are a battery pack and a heat transfer suppression sheet for a battery pack that is used in a battery pack in which battery cells are connected in series or in parallel, and that can cool the individual battery cells during normal use while suppressing propagation of heat between the battery cells when an abnormality occurs. The heat transfer suppression sheet (10) for a battery pack is used in a battery pack in which battery cells are connected in series or in parallel, and is interposed between the battery cells. The heat transfer suppression sheet (10) for a battery pack includes a heat-insulating material (11) containing at least one of inorganic particles or inorganic fibers, and a covering material (12) covering at least a part of the heat-insulating material (11). A gap (14) is formed between the heat-insulating material (11) and the covering material (12), and the gap (14) communicates with the outside of the heat-insulating material (11) and the covering material (12).