Battery Pack Surface Pressure Patch for Swelling
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Solution Overview
Problem
Conventional battery packs face challenges in uniformly maintaining surface pressure due to thickness dispersion, deterioration, and manufacturing variations among stacked battery cells, leading to uneven pressure distribution and potential damage from excessive swelling.
Innovation Solution
A battery pack design featuring a surface pressure patch with a bar shape and bending portion, attached between the end cover and side wall, which disperses pressure concentration by contacting the side wall when the interval between components is closer than a predetermined interval, ensuring uniform pressure application and structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If support bars are fixed to end plates to apply surface pressure to battery cells, then structural support is provided, but uniform pressure distribution cannot be maintained due to thickness dispersion and deterioration variations
Solution Approach 1:
The patent changes the structural parameters from rigid support bars fixed to end plates to elastic pressing members that can deform elastically. This allows the pressing members to adapt to variations in battery cell thickness and deterioration, maintaining uniform pressure distribution across all cells despite manufacturing tolerances and aging effects.
Solution Approach 2:
The patent employs elastic pressing members that function as flexible elements between the rigid end plates and battery cells. These elastic members can deform to accommodate thickness variations in stacked cells, ensuring consistent surface pressure application across the entire battery module while the rigid end plates provide overall structural support.
2Stability of the object's composition
If support bars are used to apply surface pressure, then structural rigidity is maintained, but excessive swelling causes damage due to inability to uniformly distribute pressure
Solution Approach 1:
The patent introduces elastic pressing members as flexible elements that can deform under swelling forces. These members are positioned between the rigid end plates and battery cells, allowing them to absorb swelling-induced stress through elastic deformation, thereby protecting the battery cells from damage while maintaining overall structural rigidity through the end plates.
Solution Approach 2:
The elastic pressing members serve as pre-configured cushioning elements that can absorb unexpected swelling forces. By having these elastic members in place before swelling occurs, the system is prepared to handle swelling events, distributing the forces evenly and preventing the concentration of stress that would lead to cell damage.
3Ease of manufacture
If support bars are fixed to end plates, then assembly is simplified, but pressure distribution becomes uneven due to central swelling of battery cells
Solution Approach 1:
The patent replaces rigid support bars with elastic pressing members that can deform to match the swelling profile of battery cells, particularly the central swelling that occurs during operation. This flexible approach maintains assembly simplicity while achieving uniform pressure distribution across cells with varying thickness profiles.
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 disperses pressure concentration, maintaining uniform surface pressure and securing structural rigidity, thereby improving battery pack performance and longevity by evenly distributing pressure across the battery cells.
Implementation Method 1
a surface pressure patch disposed between the end cover of the battery module and the side wall which are disposed in the receiving space, and configured to apply a pressure to an inside of the battery module when an interval between the end cover and the side wall is closer than a predetermined interval due to swelling of the battery cell
Data Source
AI summary
A battery pack is provided and includes a battery module that has a plurality of stacked battery cells and an end cover disposed on an outer side to face an outermost battery cell. A case having a receiving space accommodates the battery module and the receiving space has a side wall facing the end cover. A surface pressure patch is disposed between the end cover of the battery module and the side wall which are disposed in the receiving space, and is configured to apply a pressure to an inside of the battery module when an interval between the end cover and the side wall is closer to a predetermined interval due to swelling of the battery cell.