Dual-Terminal Battery Module Layout for Shorter Current Paths
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Solution Overview
Problem
The increase in battery size to improve capacity and grouping efficiency leads to longer internal current collection paths, resulting in increased internal resistance, which affects high-rate charge and discharge performance and safety.
Innovation Solution
A battery module design with n cells, each having multiple surfaces with dual terminal pairs, allowing for side-by-side serial connection and reduced internal resistance through shorter current collecting paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of the battery is increased to improve the battery capacity and grouping efficiency, then the battery capacity and grouping efficiency are improved, but the internal current collection path becomes too long and internal resistance increases
Solution Approach 1:
The battery cell is divided into multiple electrode terminal pairs (first positive terminal, first negative terminal, second positive terminal, second negative terminal), allowing current to be collected from multiple locations simultaneously. This segmentation of the current collection system reduces the effective path length for current flow while maintaining overall battery capacity.
2Quantity of substance
If the size of the battery is increased to improve the battery capacity and grouping efficiency, then the battery capacity and grouping efficiency are improved, but the high-rate charge and discharge performance deteriorates
Solution Approach 1:
Multiple electrode terminal pairs provide parallel current collection paths, enabling higher current flow rates without excessive voltage drops. The staggered tab arrangement at either end of the cell further segments the current collection, improving high-rate charge and discharge performance.
Solution Approach 2:
The invention utilizes the spatial dimension by arranging tabs at both ends of the cell in a staggered configuration. This three-dimensional current collection strategy reduces the effective current path length and improves electron transport efficiency during high-rate operations.
3Quantity of substance
If the size of the battery is increased to improve the battery capacity and grouping efficiency, then the battery capacity and grouping efficiency are improved, but the safety performance deteriorates
Solution Approach 1:
Multiple electrode terminal pairs and staggered tab arrangements create multiple independent current collection paths. This segmentation reduces localized current density and heat generation, improving thermal management and safety performance.
Data Source
AI summary
A battery module, a power battery pack and a vehicle are provided. The battery module comprises n cells. At least two surfaces of the cell are respectively provided with a first positive terminal and a first negative terminal, and a second positive terminal and a second negative terminal. The n cells are arranged side by side in series. The cell (100) has a length L and a width H, where L meets 600 mm<L≤1300 mm, and L and H meet 10<L/H≤20.