Endothermic Layer Between Solid Battery Unit Cells
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Solution Overview
Problem
Conventional techniques face challenges in inhibiting both the degradation of output performance and temperature rising in solid batteries when they generate heat due to short circuits, as endothermic materials used inside the batteries can disrupt ion and electron conductivity.
Innovation Solution
The arrangement of an endothermic material with low ion and electron conductivity outside the electrode bodies, between unit batteries with current collectors, allows for effective heat absorption without interfering with ion and electron conduction, thereby inhibiting temperature rise and maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an endothermic material is contained in a cathode, anode, or solid electrolyte layer of a solid battery, then heat can be absorbed, but the ion conductivity and electron conductivity of the battery seriously degrade
Solution Approach 1:
The endothermic material is extracted from the electrode bodies and solid electrolyte layer, and placed in a separate heat-absorbing layer positioned between the electrode bodies. This extraction allows the endothermic material to absorb heat without degrading the ion and electron conductivity within the electrode structures, resolving the contradiction between heat absorption capability and electrical performance.
Solution Approach 2:
A dedicated heat-absorbing layer serves as an intermediary component between the electrode bodies, containing the endothermic material. This intermediary structure enables heat absorption functionality without directly interfering with the electrochemical reactions and charge transport processes occurring within the electrode bodies and solid electrolyte layer.
2Temperature
If a conductive layer with high resistance is used to stop battery reaction during short circuit, then temperature rising can be inhibited, but it takes a long time for the shut down function to develop
Solution Approach 1:
The endothermic material is pre-positioned in the heat-absorbing layer between the electrode bodies, ready to immediately absorb heat upon generation during a short circuit. This preliminary positioning eliminates the time delay associated with developing a shut-down function, as the heat absorption action occurs instantaneously when the material reaches its activation temperature.
Solution Approach 2:
The endothermic material utilizes phase transition (such as melting or decomposition) to absorb heat rapidly during a short circuit. This phase change mechanism provides immediate heat absorption capability without requiring time for a conductive layer to develop high resistance, thus resolving the time delay issue while effectively inhibiting temperature rising.
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
This configuration effectively absorbs heat generated during short circuits, preventing battery output degradation and temperature rise while maintaining normal ion and electron conductivity within the battery.
Implementation Method 1
an endothermic layer arranged between the unit batteries adjacent in a stacking direction, the layer including an endothermic material
Data Source
AI summary
A battery that can inhibit temperature rising when generating heat due to a short circuit etc., while inhibiting degradation of the battery output performance, includes a plurality of unit batteries stacked together; and an endothermic layer arranged between the unit batteries adjacent in a stacking direction, the layer including an endothermic material, wherein each unit battery includes: a pair of current collectors; and at least one electrode body, wherein: the pair of current collectors are arranged to both ends of the unit battery in the stacking direction respectively, the electrode body includes a first pole active material layer, a second pole active material layer which is different from the first pole active material layer, and a solid electrolyte layer; the first and second pole active material layer are arranged between the pair of current collectors; and the current collectors have contact with the first or second pole active material layer.