Battery Module Stress Distribution via Intermediary Supports
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Solution Overview
Problem
Stacked battery cells are susceptible to stress, which can damage electrodes and solid electrolyte layers, particularly in solid-state batteries, and existing configurations fail to reliably prevent such damage.
Innovation Solution
Incorporating a battery cell support that directly supports battery cells on their surfaces, along with a fixation film and extending portions, to prevent damage from stress and external forces, and optionally using a placement plate with interposition portions for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are stacked in direct contact with each other, then the volumetric energy density is improved, but the battery cells are susceptible to stress and damage to electrodes and solid electrolyte layers
Solution Approach 1:
A battery cell support is introduced as an intermediary component between adjacent battery cells. This support directly supports the battery cells on their surfaces, preventing direct contact that causes stress. The battery cell support acts as a mediator that maintains close spacing for high volumetric energy density while preventing damage to electrodes and solid electrolyte layers by distributing and reducing stress on the battery cells.
2Stability of the object's composition
If battery cells are fixed between grasping means, then the battery cells are secured, but ends of the battery cell become susceptible to stress
Solution Approach 1:
The support structure is segmented into multiple battery cell supports, each independently supporting specific battery cells. This segmentation allows the support to contact and stabilize the battery cells at multiple locations without concentrating stress at the ends. Each support unit distributes the fixation load across the supported cell's surface area, preventing end stress while maintaining stability.
3Quantity of substance
If battery cells are stacked without joint portions at four sides, then the volumetric energy density is improved, but the battery cells cannot be fixed using grasping means
Solution Approach 1:
The battery cell support serves as a mediator that enables fixation without requiring joint portions at the four sides of battery cells. By placing supports between the cells, the system achieves stable fixation through the supports themselves rather than through modifications to the battery cell structure. This maintains the simplified single-sheet exterior casing design for high volumetric energy density while providing secure fixation capability.
Data Source
AI summary
Provided is a battery module including a plurality of battery cells stacked on one another and being capable of effectively preventing damage to the battery cells despite such a configuration. A battery module 1 includes a plurality of battery cells 10 stacked on one another and a battery cell support 2. The battery cells 10 each include a battery 11 and an exterior casing 12 accommodating the battery 11. The battery cell support 2 is disposed between the plurality of battery cells 10. The battery module preferably further includes a fixation film 6 wound around the plurality of battery cells in a stacking direction and fixing the plurality of battery cells.