Double-Sealed Battery Structure for Leak and Vibration Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery sealing methods are prone to leakage and have poor sealing efficiency, and the connection of multiple electrode cores in series leads to instability and safety issues due to movement and relative displacement during vibration and bumping.
Innovation Solution
A battery design featuring a metal shell with electrode core assemblies sealed in a packaging film, which is then secondary sealed within the metal shell, creating a double-layer sealing effect. The air pressure between the metal shell and the packaging film is lower than the external pressure, reducing internal gaps and preventing electrode core movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode core is directly sealed in the shell, then the manufacturing process is simple, but the sealing effect is poor and leakage is prone to occur
Solution Approach 1:
The patent implements a nested sealing structure where the electrode core is first sealed in an inner sealing structure, and then the entire assembly is sealed in an outer sealing structure. This multi-level nesting approach enhances the sealing effect without significantly complicating the manufacturing process, as each sealing layer provides redundant protection against electrolyte leakage.
Solution Approach 2:
The sealing system is segmented into multiple independent sealing structures (inner and outer sealing structures) rather than using a single sealing layer. This segmentation allows each sealing structure to perform its sealing function independently, and the combination of multiple sealing structures provides enhanced reliability against leakage while maintaining manufacturing feasibility.
2Quantity of substance
If multiple electrode cores are connected in series in the shell, then the battery capacity increases, but the electrode cores are prone to movement and relative displacement during vibration and bumping
Solution Approach 1:
Multiple electrode cores are segmented and individually enclosed in separate inner sealing structures, which are then collectively sealed in an outer sealing structure. This segmentation prevents the electrode cores from moving relative to each other during vibration and bumping, while still allowing them to be connected in series to increase battery capacity.
Solution Approach 2:
The sealing structures act as intermediary elements between the electrode cores and the external environment, providing mechanical support and preventing movement. The inner sealing structure directly contacts and stabilizes each electrode core, while the outer sealing structure provides additional mechanical support for the entire assembly.
3Strength
If the shell is damaged, then the battery structure is compromised, but the electrolyte solution is prone to leakage due to poor sealing
Solution Approach 1:
The patent implements beforehand cushioning by creating multiple sealing barriers (inner and outer sealing structures) that protect against electrolyte leakage even if the outer shell is damaged. This redundant sealing approach ensures that a single point of failure in the shell does not necessarily lead to leakage, as the sealed electrode cores remain protected within the sealing structures.
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 double-layer sealing enhances the mechanical strength and safety of the battery, reduces the risk of leakage, and allows for the manufacture of longer, more stable batteries with improved volume utilization and reduced weight in battery packs.
Implementation Method 1
An air pressure between the metal shell and the packaging film is lower than an air pressure outside the metal shell. An air pressure inside the packaging film is lower than the air pressure between the metal shell and the packaging film.
Data Source
AI summary
A battery, a battery module, a battery pack, and an electric vehicle are provided. The battery includes a metal shell and a plurality of electrode core assemblies sealed in the metal shell and arranged in sequence. The electrode core assemblies are connected in series. Each of the electrode core assemblies includes at least one electrode core. The electrode core assemblies are sealed in a packaging film. An air pressure between the metal shell and the packaging film is lower than an air pressure outside the metal shell. An air pressure inside the packaging film is lower than the air pressure between the metal shell and the packaging film.