Battery Pack Lower Holder Structure for Cell Cooling and Stability
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Solution Overview
Problem
Rechargeable batteries generate heat during charging and discharging, which can lead to damage if not effectively dissipated, and require structures that can fix and cool multiple unit cells to handle shock and vibration.
Innovation Solution
A rechargeable battery pack design featuring a battery housing with a lower holder unit that fixes and cools unit cells using a cooling unit in the bottom plate, incorporating aluminum for heat transfer and thermal glue for insulation, along with a bus bar system for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple unit battery cells are connected in parallel or series to implement large capacity, then the battery capacity increases, but the heat generation during charging and discharging increases
Solution Approach 1:
The battery pack is divided into multiple unit battery cells that can be independently arranged and connected. Each unit cell can be individually managed for heat dissipation, allowing the system to scale capacity while maintaining thermal control through modular segmentation.
Solution Approach 2:
A cooling unit is introduced as an intermediary component between the battery cells and the environment. This cooling unit actively removes heat generated during charging and discharging, enabling the system to maintain high capacity without excessive temperature rise.
2Temperature
If a structure is designed to effectively dissipate heat during charging and discharging, then the cooling performance improves, but the device complexity increases
Solution Approach 1:
The lower holder unit serves multiple functions: it mechanically supports and positions the battery cells while simultaneously acting as a heat dissipation structure. By integrating support and cooling functions into a single component, the design improves cooling performance without proportionally increasing structural complexity.
Solution Approach 2:
The cooling unit is merged with the housing structure rather than being a separate auxiliary component. This integration allows the housing to serve dual purposes of protection and thermal management, improving cooling efficiency while minimizing additional structural complexity.
3Stability of the object's composition
If the lower holder unit is formed integrally with the bottom plate to include groove portions for fixing battery cells, then the fixing stability improves, but the manufacturing complexity increases
Solution Approach 1:
The groove portions are pre-formed as integral features of the lower holder unit during the molding process. This preliminary formation of fixing structures eliminates the need for separate assembly steps to install fixing components, thereby improving fixing stability while actually simplifying the overall manufacturing process.
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 design effectively dissipates heat generated during operation, stabilizes the battery cells, and enhances durability against shock and vibration, improving the battery's cooling efficiency and driving stability.
Implementation Method 1
a cooling unit in a bottom plate of the battery housing under the lower holder unit to cool the unit battery cells
Implementation Method 2
The filler may be an electrically insulating thermal glue
Data Source
AI summary
A rechargeable battery pack includes: a battery housing including an inner space; a plurality of unit battery cells in the inner space; a bus bar configured to electrically connect unit battery cells of the plurality of unit battery cells; a lower holder unit configured to fix the unit battery cells in the battery housing; and a cooling unit in a bottom plate of the battery housing under the lower holder unit to cool the unit battery cells.