Battery Pack Block Layer and Heat Absorbing Layer Design
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Solution Overview
Problem
Lithium secondary batteries with graphite or alternative negative electrodes face issues of high-temperature high-pressure gas and flame release during malfunctions, leading to potential fires, and the heat absorbing or insulating layers can react with molten alkali salts, losing their functionality.
Innovation Solution
A battery pack design featuring a heat absorbing layer with a flame-retardant binding agent and a block layer resistant to molten alkali salts, preventing leakage and maintaining heat absorption and insulation functions by isolating the heat absorbing layer from direct contact with molten materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat absorbing layer is provided to suppress temperature increase of the battery pack surface, then the surface temperature is reduced, but the heat absorbing layer reacts with molten alkali salts and loses its functionality
Solution Approach 1:
The protective structure is divided into multiple functional layers: a block layer made of molten alkali salt-resistant material positioned between the secondary battery and the heat absorbing layer, and the heat absorbing layer positioned between the block layer and the molded body. This segmentation prevents direct contact between the heat absorbing layer and molten alkali salts while maintaining heat absorption functionality.
Solution Approach 2:
The block layer made of molten alkali salt-resistant material serves as an intermediary barrier between the secondary battery (source of molten alkali salts) and the heat absorbing layer. This intermediary prevents harmful chemical reactions while allowing the heat absorbing layer to perform its temperature suppression function.
2Reliability
If a heat insulating material is inserted to shield the battery from ambient temperature, then battery characteristics are maintained, but the heat insulating material may react with molten alkali salts
Solution Approach 1:
The protective structure is divided into multiple functional layers: a block layer made of molten alkali salt-resistant material positioned between the secondary battery and the heat absorbing layer, and the heat absorbing layer positioned between the block layer and the molded body. This segmentation prevents direct contact between the heat absorbing layer and molten alkali salts while maintaining heat absorption functionality.
Solution Approach 2:
The block layer made of molten alkali salt-resistant material serves as an intermediary barrier between the secondary battery (source of molten alkali salts) and the heat absorbing layer. This intermediary prevents harmful chemical reactions while allowing the heat absorbing layer to perform its temperature suppression function.
3Use of energy by moving object
If the energy of the lithium ion secondary battery is increased to meet functional demands, then power supply capability is improved, but the amount of heat generated during malfunction increases
Solution Approach 1:
The heat generated during battery malfunction, which is normally a harmful factor, is converted into a beneficial effect by using the heat absorbing layer. This layer absorbs the excessive heat through phase change or chemical reaction, preventing temperature escalation and potential fires, thus transforming the harmful thermal energy into a controlled protective mechanism.
Solution Approach 2:
The heat absorbing layer utilizes phase transitions (such as melting or decomposition) to absorb excessive heat generated during battery malfunction. This phase change process consumes large amounts of thermal energy, effectively suppressing temperature increase and preventing catastrophic failures.
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
Prevents contents from flowing out and effectively suppresses surface temperature increases during battery malfunctions, ensuring the integrity and safety of the battery pack.
Implementation Method 1
When each of the magnesium hydroxide and the aluminum hydroxide is heated, it absorbs ambient heat and discharges water (H 2 O). Therefore, combustion heat is reduced by this heat absorbing action.
Implementation Method 2
When each of the magnesium hydroxide and the aluminum hydroxide is heated, it absorbs ambient heat and discharges water (H 2 O). Therefore, combustion heat is reduced by this heat absorbing action.
Implementation Method 3
proposed is a method for introducing a polymeric material in the battery pack to utilize melting latent heat generated when the polymeric material melts
Implementation Method 4
by inserting the heat insulating material in the battery pack to shield the battery from the ambient temperature, the battery is not affected by the ambient temperature
Data Source
Figure 1
Figure 2~3(b)
AI summary
A battery pack 1 of the present invention includes: a secondary battery 2; a molded body 11 configured to store therein the secondary battery; a temperature increase suppressing layer 13 provided between the secondary battery and an inner surface of the molded body to suppress a temperature increase of an outer surface of the molded body; and a block layer 12 provided between the secondary battery and the temperature increase suppressing layer to block leakage from the secondary battery. With this, if a malfunction, such as a case where contents, such as a molten material, flows out from the secondary battery, occurs, the contents are prevented from flowing out to the outside of the battery pack, and the temperature increase of the surface of the battery pack is suppressed.