Secondary Battery Cell Spacing With Incombustible Heat Storage Sheets
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Solution Overview
Problem
Secondary batteries face performance deterioration and fire risks due to temperature fluctuations, with existing heat storage solutions being combustible and ineffective in preventing fire spread.
Innovation Solution
A secondary battery design incorporating a second heat storage sheet with an incombustible layer, positioned between cells, to absorb heat and prevent temperature rises, featuring a thermoplastic resin matrix with a specific melting point range and coated particles for enhanced heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat storage sheet with combustible heat storage material is used, then temperature rise of cells is suppressed, but fire spread risk increases when battery is damaged
Solution Approach 1:
The heat storage sheet is constructed as a composite material consisting of a heat storage material layer combined with an incombustible material layer. This composite structure allows the sheet to simultaneously provide heat storage functionality for temperature control and fire prevention through the incombustible layer, resolving the contradiction between temperature rise suppression and fire spread risk
Solution Approach 2:
The incombustible material layer acts as an intermediary barrier between the combustible heat storage material and the external environment. This intermediary layer prevents fire spread while allowing the heat storage material to function, thus resolving the contradiction by introducing a mediating element that provides both functions
2Temperature
If cooling mechanism is added to suppress temperature rise, then battery performance is maintained, but battery size increases
Solution Approach 1:
The heat storage sheet serves multiple functions simultaneously: it acts as a thermal management component to suppress temperature rise during charging, serves as a fire prevention barrier with its incombustible layer, and provides structural separation between cells. This multi-functionality eliminates the need for separate cooling mechanisms, maintaining temperature control while avoiding increased battery size
Solution Approach 2:
The patent merges the heat storage functionality with fire prevention functionality into a single integrated component (the heat storage sheet with incombustible layer). This consolidation combines multiple protective functions into one element, avoiding the need for additional separate cooling or fire suppression equipment that would increase battery size
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 suppresses temperature-related performance deterioration and prevents fire spread in secondary batteries, ensuring safety and reliability by using an incombustible material that absorbs heat generated during charging.
Implementation Method 1
the second heat storage sheet including an incombustible layer, wherein the second heat storage sheet is disposed between the two or more cells
Implementation Method 2
featuring a thermoplastic resin matrix with a specific melting point range
Data Source
AI summary
A secondary battery that can suppress performance deterioration due to temperature rise and has excellent incombustibility is provided. The secondary battery contains two or more cells each including a cell stack that includes a positive electrode having a positive electrode terminal, a negative electrode having a negative electrode terminal, a separator interposed between the positive electrode and the negative electrode, and an electrolyte held by the separator and contains a second heat storage sheet including an incombustible layer. The second heat storage sheet is disposed between the two or more cells.