Solid-State Battery Module Pressurization With Endothermic Heat Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium batteries with solid-state electrolytes have lower sensitivity for detecting abnormal heat generation, leading to a shorter time from detection to thermal runaway, necessitating a lower abnormality detection temperature.
Innovation Solution
Incorporating a heat-absorbing material with an endothermic reaction initiation temperature between 80°C and 190°C into the liquid filling the container, which pressurizes the battery cell stack, enhancing reaction uniformity and increasing the abnormality detection temperature by prolonging the time to thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a liquid is used to pressurize the battery element, then the battery element is pressurized at a predetermined pressure, but the sensitivity for detecting abnormal heat generation is lower
Solution Approach 1:
The patent introduces a heat-absorbing material as an intermediary substance between the container and the battery element. This material serves dual purposes: maintaining pressurization while enabling thermal detection. The heat-absorbing material directly contacts both the battery element and the temperature detection device, acting as a thermal conduit that improves detection sensitivity without compromising pressurization function.
Solution Approach 2:
The patent changes the thermal parameters of the pressurizing medium by incorporating a heat-absorbing material with specific endothermic reaction initiation temperature (50°C to 200°C). This parameter change allows the system to absorb excess heat through endothermic reactions while maintaining pressurization, thereby improving both thermal management and detection capabilities.
2Reliability
If the abnormality detection temperature is lowered to ensure safety, then the time from detecting abnormal heat generation until thermal runaway is shorter
Solution Approach 1:
The patent converts the potentially harmful rapid heat generation into a beneficial process by using the heat-absorbing material's endothermic reaction. When abnormal heat generation occurs, the heat-absorbing material absorbs the excess heat through endothermic reactions at controlled temperatures (50°C to 200°C), transforming the harmful thermal runaway process into a controlled heat absorption process that extends the time available for safety responses.
Solution Approach 2:
The patent utilizes phase transitions and endothermic reactions of the heat-absorbing material to manage thermal energy. The material undergoes phase changes or chemical reactions at specific temperature ranges (50°C to 200°C) that absorb excess heat, creating a time buffer between abnormal heat generation detection and thermal runaway, thereby extending the safe response window.
3Use of energy by moving object
If solid-state battery cells are used, then energy efficiency is improved, but the uniformity of reaction is lower due to expansion and contraction
Solution Approach 1:
The heat-absorbing material acts as an intermediary that uniformly distributes pressure and thermal energy across all battery cells. By directly contacting each battery element and serving as a thermal and mechanical conduit, it ensures uniform reaction conditions across the battery module, compensating for the expansion and contraction issues of solid-state cells.
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 battery module achieves higher reaction uniformity and increased abnormality detection temperature, allowing for safer operation by prolonging the time to thermal runaway through the endothermic reaction of the heat-absorbing material.
Implementation Method 1
the heat-absorbing material has an endothermic reaction initiation temperature of 80° C. or greater and 190° C. or less
Data Source
AI summary
A battery module including a battery cell stack in which a plurality of battery cells is stacked, a container filled with a liquid and containing the battery cell stack, and a pressurizer for pressurizing the liquid that is filled in the container. The battery cells are solid-state battery cells. The battery cell stack is packaged with a packaging material. The liquid contains an oil and a heat-absorbing material. The heat-absorbing material has an endothermic reaction initiation temperature of 80° C. or greater and 190° C. or less.