Soft-Pack CTP Battery Pack Structure for Assembly and Impact Support
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Solution Overview
Problem
Soft-pack cells face integration challenges in CTP-type battery packs due to their inability to withstand external impacts and poor assembly performance, necessitating improved structural support and assembly methods.
Innovation Solution
A battery pack design incorporating a box body, cell stack, thermally conductive structural adhesive, and side plates with fixture fitting portions, grooves, and reinforcing ribs to facilitate easy assembly and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If soft-pack cells are integrated into CTP-type battery packs, then energy density is improved, but structural strength and impact resistance deteriorate
Solution Approach 1:
The battery pack is divided into modular battery modules, each containing multiple soft-pack cells arranged in series. This segmentation allows the flexible soft-pack cells to be organized into structured modules that maintain structural integrity while achieving high energy density. The module-level organization provides mechanical support without requiring rigid cell casings.
Solution Approach 2:
The battery module structure combines soft-pack cells with rigid structural components (module housing, end plates, and structural adhesives) to create a composite assembly. This composite approach allows the soft cells to provide high energy density while the composite structure provides the necessary mechanical strength and impact resistance.
2Volume of moving object
If soft-pack cells are integrated into CTP-type battery packs, then space utilization is improved, but assembly performance deteriorates
Solution Approach 1:
Multiple soft-pack cells are pre-assembled into battery modules with predetermined configurations before integration into the full battery pack. This preliminary assembly establishes proper cell orientation, electrical connections, and mechanical support structures, making the subsequent integration process simpler and more reliable while maximizing space utilization.
Solution Approach 2:
Structural adhesives and module housing components serve as intermediaries between the soft-pack cells and the battery pack structure. These intermediary elements facilitate assembly by providing alignment features, mechanical support, and bonding interfaces, making it easier to integrate the flexible soft cells into the rigid battery pack architecture.
3Power
If multiple battery modules are connected in series to achieve high voltage, then voltage output is improved, but system complexity increases
Solution Approach 1:
The high-voltage battery pack is segmented into multiple standardized battery modules, each containing cells connected in series to achieve a specific voltage level. By organizing modules in a systematic arrangement with consistent electrical connections and mechanical interfaces, the overall system complexity is managed through modularity rather than increasing with voltage requirements.
Solution Approach 2:
Each battery module is designed as a universal building block that can be replicated and combined in various configurations to achieve different voltage and capacity requirements. The standardized module design with consistent electrical terminals and mechanical interfaces allows flexible system configuration without proportionally increasing complexity, enabling the same module to serve multiple functions in different arrangements.
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 allows for easy assembly and improved cycling performance of soft-pack cells, enhances heat dissipation, and ensures structural stability and safety against thermal runaway.
Implementation Method 1
The thermally conductive structural adhesive is arranged between the cell stack and the lower casing bottom plate
Data Source
AI summary
The disclosure relates to the technical field of batteries and specifically provides a battery pack and an electric vehicle. The battery pack includes a box body having a lower casing bottom plate, a cell stack formed by stacking a plurality of soft-pack cells, a thermally conductive structural adhesive arranged between the cell stack and the lower casing bottom plate, side plates arranged at both ends of the cell stack in a stacking direction and adhered to main body surfaces of the soft-pack cells at both ends, and fixture fitting portions arranged on surfaces of the side plates opposite to the soft-pack cells. In the solution, a soft-pack cell to pack (CTP) battery pack is constructed based on the soft-pack cells, the cell stack formed by stacking the soft-pack cells can be well protected, and assembly can be easily performed.