Parallel Battery Pack Layout for Peak Power and Long Lifespan
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Solution Overview
Problem
Existing battery packs struggle to provide high-power and high-capacity output simultaneously without compromising lifespan, especially in applications requiring long-term high power delivery.
Innovation Solution
A hybrid battery pack structure is employed, combining a high-power type-1 battery cell with multiple high-capacity type-2 battery cells. The type-1 battery cell is surrounded by type-2 battery cells arranged in a circular configuration, connected in parallel to enhance power output and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single type of battery cell is used to achieve high power output, then power delivery capability is improved, but lifespan decreases due to excessive heat generation and stress
Solution Approach 1:
The battery pack is segmented into two distinct types of battery cells: type-1 cells optimized for high power output and type-2 cells optimized for high capacity and longevity. This segmentation allows each cell type to perform its specialized function, with type-1 cells handling peak power demands and type-2 cells providing sustained energy supply, thereby resolving the contradiction between power output and lifespan
Solution Approach 2:
Different regions of the battery pack are assigned different cell types based on local functional requirements. Type-1 cells with high power density are strategically placed to meet instantaneous power demands, while type-2 cells with high capacity are positioned to provide long-term energy supply. This local quality differentiation allows the system to achieve both high power and extended lifespan simultaneously
2Power
If type-1 battery cells with high output power are used, then power delivery is improved, but heat generation increases causing thermal management issues
Solution Approach 1:
Type-2 battery cells act as thermal intermediaries surrounding the type-1 cells. These type-2 cells with lower heat generation characteristics serve as a thermal buffer, absorbing and dissipating heat away from the high-power type-1 cells. This intermediary arrangement allows the type-1 cells to deliver high power while the type-2 cells manage the thermal load, preventing overheating and associated problems
3Power
If high-power battery cells are used to meet power demands, then power output is improved, but capacity decreases limiting operating time
Solution Approach 1:
The battery pack merges type-1 cells (high power, lower capacity) and type-2 cells (lower power, high capacity) into a unified parallel electrical configuration. This merging allows the system to simultaneously access both high power output from type-1 cells and extended operating time from type-2 cells, achieving a combination of power and duration that neither cell type could provide alone
4Power
If a hybrid structure with different battery cell types is used, then power and capacity are improved, but manufacturing complexity increases
Solution Approach 1:
The battery pack employs a nested arrangement where type-2 cells are positioned in the peripheral regions surrounding the centrally located type-1 cells. This nested doll-like structure efficiently utilizes the available space, with the outer layer of type-2 cells providing both structural containment and energy storage, while the inner type-1 cells provide high power output. This geometric nesting simplifies the overall packaging and reduces structural complexity compared to more distributed arrangements
Data Source
AI summary
A battery pack, a battery module including the battery pack, and a power supply device including the battery module. The battery pack includes: a type-1 battery cell; and a series of type-2 battery cells which have an output power and a capacity different from an output power and a capacity of the type-1 battery cell and are arranged along a circumference of the type-1 battery cell to surround the type-1 battery cell. The series of type-2 battery cells are connected in parallel to the type-1 battery cell. The battery pack is a high-power, high-capacity battery pack capable of instantaneously outputting high power without a decrease in lifespan for a long time.