Solid-State Battery Thermal Insulation for Weight Reduction
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Solution Overview
Problem
High-voltage batteries for motor vehicles require active cooling for lithium ion cells, which increases weight, costs, and reduces efficiency due to space constraints, necessitating a more efficient and lightweight solution.
Innovation Solution
The use of solid-state battery cells with a thermally insulating holding device that minimizes heat exchange between the battery module and housing, eliminating the need for active cooling by maintaining a virtually adiabatic structure, allowing the battery to operate efficiently at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling is used for lithium ion cells, then temperature control is improved, but weight increases and installation space is reduced
Solution Approach 1:
The patent removes the cooling device entirely from the battery system by using solid-state cells that do not require active cooling. This extraction of the cooling subsystem directly reduces battery weight while maintaining temperature control through the inherent properties of solid-state cells and passive thermal management.
Solution Approach 2:
The patent changes the fundamental parameter of cell type from liquid electrolyte lithium ion cells to solid-state cells. This parameter change fundamentally alters the thermal management requirements, eliminating the need for active cooling systems and thereby reducing weight.
2Temperature
If active cooling is used for lithium ion cells, then temperature control is improved, but installation space is reduced
Solution Approach 1:
By removing the cooling device from the battery system through the use of solid-state cells, the patent frees up installation space that would otherwise be occupied by cooling components, thereby increasing the available volume for battery modules.
Solution Approach 2:
The transition to solid-state cells changes the thermal management parameter from requiring active cooling to passive thermal control, which eliminates the space-consuming cooling infrastructure and optimizes installation space.
3Temperature
If cooling device is installed, then temperature control is improved, but costs increase
Solution Approach 1:
The patent eliminates the cooling device from the battery system, which directly reduces manufacturing costs by removing the need to procure, install, and maintain expensive cooling components while still achieving temperature control through solid-state cell properties.
4Weight of moving object
If solid-state cells are used, then weight is reduced and installation space is improved, but temperature management becomes challenging
Solution Approach 1:
The patent converts the potential harm of heat generation in solid-state cells into a benefit by designing the holding device to provide passive thermal management. The holding device structure, while primarily for mechanical support, also serves to manage temperature by providing a controlled thermal environment, thus converting a potential problem into an advantage.
5Temperature
If thermally insulating holding device is used, then heat exchange is minimized, but manufacturing complexity increases
Solution Approach 1:
The holding device is designed to serve multiple functions simultaneously: mechanical support of battery modules and thermal insulation. This multi-functionality reduces the need for separate dedicated insulation components, thereby simplifying manufacturing while achieving heat exchange control.
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 solution results in a high-voltage battery that is more installation space-efficient, lighter, and cost-effective, capable of quick charging and discharging while maintaining performance without the need for cooling devices, enhancing overall efficiency and safety.
Implementation Method 1
a thermally insulating holding device (12) for holding the battery module (2) in the reception space (3). The thermally insulating holding device (12) is designed to minimize an exchange of heat between the battery module (2) and the battery housing (4) in order to prevent cooling of the battery cells (11)
Implementation Method 2
solid-state cells whose internal resistance decreases as the temperature increases
Data Source
AI summary
A high-voltage battery for a motor vehicle includes at least one battery module including a cell block with stacked battery cells, wherein the battery cells are embodied as solid-body cells, the internal resistance of which decreases as the temperature rises, a battery housing having a receiving space for receiving the at least one battery module, and a heat-insulating holding device for holding the at least one battery module in the receiving space. The heat-insulating holding device is designed to minimize heat exchange between the at least one battery module and the battery housing for preventing cooling of the battery cells. A motor vehicle with the high-voltage battery is also provided.