Battery Module Magnet Members Compressive Force Volume Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium secondary battery modules face challenges in reducing size and increasing lifespan while maintaining high energy density and output performance, particularly due to the large volume increase of lithium metal batteries, which necessitates thicker battery cases and limited installation space in applications like electric vehicles.
Innovation Solution
Incorporating magnet members to apply a compressive force and external magnetic field to the battery module, which suppresses the volume increase of unit cells, enhances lithium electrodeposition uniformity, and integrates a frame for thermal management and structural resistance, allowing for a thinner battery design and improved lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number or size of unit cells is increased to achieve high output and large capacity, then the energy density and output performance are improved, but the overall size of the battery module increases
Solution Approach 1:
Multiple unit cells are stacked vertically in a nested configuration along the thickness direction, allowing high capacity to be achieved within a compact footprint by utilizing the vertical dimension for cell arrangement
2Quantity of substance
If lithium metal batteries are used to achieve high energy density, then the energy density is improved, but the volume of the battery increases necessitating thicker cases
Solution Approach 1:
Unit cells are stacked vertically to maximize space utilization, achieving high energy density without increasing the horizontal footprint, thus avoiding the need for thicker battery cases
Solution Approach 2:
A thin protective case is used instead of a thick rigid case, as the magnet members provide the necessary compressive force to maintain cell structure and prevent swelling, allowing the case to be thinner while still providing protection
3Stability of the object's composition
If magnet members are added to apply compressive force to suppress volume increase, then the volume stability is improved, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into the magnet members: they provide compressive force to suppress volume increase, generate magnetic fields to control electrodeposition, and serve as structural components integrated with the battery module housing, thereby reducing overall device complexity despite adding functionality
Solution Approach 2:
The magnet members serve multiple purposes simultaneously: mechanical compression, magnetic field generation for electrodeposition control, and structural support, which justifies their inclusion by delivering multiple benefits from a single component
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 reduces battery thickness, enhances energy density, and extends the lifespan of lithium batteries by controlling electrodeposition, managing thermal stress, and minimizing internal physical stress through magnetic forces and volume cushioning materials.
Implementation Method 1
at least one pair of magnet members arranged to provide a compressive force to the stacked plurality of unit cells and magnetically coupled to each other
Implementation Method 2
Incorporating magnet members to apply a compressive force and external magnetic field to the battery module, which suppresses the volume increase of unit cells, enhances lithium electrodeposition uniformity
Data Source
AI summary
A battery module includes a plurality of unit cells stacked along a stacking direction thereof; and at least one pair of magnet members arranged to provide a compressive force to the stacked plurality of unit cells and magnetically coupled to each other.