Battery Module Heat-Absorbing Sheet for Thermal Runaway Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary battery modules face challenges in effectively suppressing rapid temperature rises during high-speed charging or high-output discharging, which can lead to ignition or damage due to thermal runaway.
Innovation Solution
A secondary battery module incorporating a heat-absorbing sheet with a heat-absorbing agent, such as inorganic hydrates or carbonates, sandwiched between battery cells. The heat-absorbing sheet may also include a void part, a heat storage material, and a flame shielding layer to enhance its heat absorption and fire-resistant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat-absorbing agent is added to the exterior film, then the heat-absorbing effect is improved, but the flexibility and strength of the exterior film deteriorate
Solution Approach 1:
The invention divides the heat-absorbing function from the exterior film structure by introducing a separate heat-absorbing sheet between battery cells. This sheet contains the heat-absorbing agent (such as inorganic hydrates, metal hydroxides, or carbonates) while the exterior film maintains its original flexibility and strength properties without being compromised by heat-absorbing material additions.
Solution Approach 2:
The heat-absorbing sheet acts as an intermediary component between battery cells, absorbing excess heat generated during high-speed charging or high-output discharging. This mediator approach allows the exterior film to remain structurally intact while still providing thermal management through the intermediate heat-absorbing layer.
2Temperature
If the content of heat-absorbing agent is increased, then the heat-absorbing effect is improved, but the thickness and flexibility of the exterior part are compromised
Solution Approach 1:
The thermal management function is segmented into a dedicated heat-absorbing sheet with optimal thickness for heat absorption, separate from the exterior film whose thickness must be minimized to maintain flexibility. This allows each component to be optimized independently for its specific function.
Solution Approach 2:
The heat-absorbing sheet is strategically positioned between battery cells where heat generation is most intense, providing localized thermal management. This local quality approach concentrates the heat-absorbing function where it is most needed without increasing the overall thickness of the exterior assembly.
3Reliability
If a fire resistant coating is applied to the battery cell, then the fire resistance is improved, but the heat-absorbing capacity is limited due to thickness constraints
Solution Approach 1:
The invention separates the fire resistance function (provided by the exterior film and coating) from the heat-absorbing function (provided by the heat-absorbing sheet with high heat-absorbing agent content). This segmentation allows each function to be optimized independently without compromising the other.
Solution Approach 2:
The system uses composite materials strategically: the exterior film provides fire resistance through its multilayer structure, while the heat-absorbing sheet provides superior heat absorption capacity through high content of heat-absorbing agents like inorganic hydrates and metal hydroxides. This composite approach maximizes both fire resistance and heat-absorbing capacity.
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 proposed solution effectively suppresses rapid temperature rises, prevents ignition or damage due to thermal runaway, and mitigates internal pressure rises in the battery module by absorbing and extinguishing heat from overheated battery cells.
Implementation Method 1
a heat-absorbing sheet including a heat-absorbing agent and sandwiched between battery cells... suppresses rapid temperature rises... by absorbing and extinguishing heat
Implementation Method 2
the heat-absorbing sheet is a heat-absorbing sheet having a void part
Implementation Method 3
the heat-absorbing sheet is a heat-absorbing sheet further including a heat storage material
Implementation Method 4
the heat-absorbing sheet is a heat-absorbing sheet further including a flame shielding layer
Data Source
AI summary
The present invention relates to a secondary battery module including a heat-absorbing sheet including a heat-absorbing agent and sandwiched between battery cells. The configuration of the present invention can suppress a rapid temperature rise of a secondary battery due to heat generation during high-speed charging and high-output discharging, internal short circuits, or the like, minimize damage such as ignition and smoking due to thermal runaway, and prevent or delay the chain explosion to other battery cells by absorbing and extinguishing the heat from battery cells that have reached abnormally high temperature. In addition, the expansion of the battery cell itself caused by the heat generation and temperature rise described above can be suppressed.