Composite Electrode Layout for Self-Heating Solid-State Batteries
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Solution Overview
Problem
Existing all-solid-state batteries suffer from low electrochemical performance and energy density due to low ion conductivity and heat generation issues, with existing heat management technologies increasing battery size or requiring external power, and failing to maintain heat generation effectively.
Innovation Solution
An all-solid-state battery design with a stacked electrode assembly featuring a high heat-generating first electrode at the center and a low heat-generating second electrode, where the first electrode has a higher solid electrolyte ratio, allowing internal temperature increase without increasing battery volume or requiring external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate heat generation unit is provided, then the battery temperature can be increased, but the energy density decreases due to increased battery size and external power requirements
Solution Approach 1:
The patent merges the heat generation function into the electrode structure itself by creating a composite electrode that combines heat-generating material and active material in the same layer, eliminating the need for separate heat generation units and external power sources
Solution Approach 2:
The battery performs self-heating through its own electrode structure during normal operation, using the electrochemical reactions within the composite electrode to generate heat internally without requiring external power input
2Temperature
If the thickness of the battery cell is increased to accommodate heating elements, then temperature control is improved, but energy density decreases
Solution Approach 1:
The heating function is integrated into the electrode layer itself rather than adding separate heating elements, so the battery cell thickness does not need to be increased to accommodate additional components
Solution Approach 2:
The composite electrode structure allows different regions of the electrode to have different properties, with heat-generating material distributed within the electrode layers to provide localized heating where needed
3Temperature
If all electrodes generate heat uniformly, then temperature distribution is improved, but energy waste increases due to excessive heat generation
Solution Approach 1:
The patent applies heat-generating material to specific electrodes based on their heat generation characteristics, creating a composite electrode structure where only certain electrodes contribute to heating, thereby optimizing temperature distribution while minimizing energy waste
Solution Approach 2:
Instead of making all electrodes heat-generating, the patent selectively applies heat-generating material to specific electrodes that benefit most from heating, avoiding unnecessary heat generation in electrodes that do not require it
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 design enhances battery capacity and energy density, particularly at subzero temperatures, by uniformly raising the internal temperature and maintaining stability, thus improving overall performance.
Implementation Method 1
a relatively high heat-generating first electrode and a relatively low heat-generating second electrode, wherein the first electrode is disposed in a center of the electrode assembly
Implementation Method 2
an all-solid-state battery comprising an electrode assembly and a solid electrolyte
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
Disclosed is an all-solid-state battery comprising an electrode assembly and a solid electrolyte, wherein the electrode assembly comprises a structure in which plate-shaped electrodes are stacked; and the electrodes include a relatively high heat-generating first electrode and a relatively low heat-generating second electrode, wherein the first electrode is disposed in a center of the electrode assembly, the all-solid-state battery with improved performance by increasing the temperature of the battery without adding additional members.