Bipolar Electrode Assembly for High Voltage Battery Design
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Solution Overview
Problem
Current lithium batteries face challenges in achieving high energy density, safety, and cycle performance, particularly in the context of rapid development in electric vehicles and mobile electronics.
Innovation Solution
The electrode assembly is designed with a bipolar current collector and composite current collectors, along with active layers and separators, to create a series connection within the battery, maximizing internal space and increasing output voltage, thereby enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional single-polarity electrode plate structure is used, then the battery structure is simple, but the energy density and output voltage are limited
Solution Approach 1:
The electrode plate is divided into multiple electrode plate units, each with different polarities (positive and negative), arranged in series connection. This segmentation allows the battery to achieve higher voltage and energy density while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces a multi-dimensional electrode plate structure where electrode plate units are arranged both in the thickness direction and the planar direction, creating a three-dimensional series connection configuration that increases energy density without significantly increasing device complexity.
2Power
If electrode plate units with different polarities are arranged in series connection, then the output voltage increases, but the internal space utilization becomes more challenging
Solution Approach 1:
The electrode plate units are arranged in a three-dimensional configuration, utilizing both the thickness direction and planar directions to achieve series connection. This spatial arrangement maximizes internal space utilization while maintaining high output voltage through series connection of multiple electrode plate units.
Solution Approach 2:
The bipolar current collector serves multiple functions simultaneously: it acts as the current collector for one electrode plate unit while also serving as the separator and structural support for adjacent units with opposite polarity. This nesting approach efficiently utilizes internal space while achieving series connection.
3Quantity of substance
If a bipolar current collector structure is used, then the energy density increases, but the manufacturing complexity increases
Solution Approach 1:
The bipolar current collector merges multiple functions into a single component: it serves as the current collector for both positive and negative electrode plate units, and also acts as the separator between units of opposite polarity. This merging reduces the number of separate components needed and simplifies the manufacturing process while maintaining high energy density.
Solution Approach 2:
The bipolar current collector is designed with multi-functionality, serving simultaneously as current collector, separator, and structural support for adjacent electrode plate units with different polarities. This universal design reduces manufacturing complexity by eliminating the need for separate components for each function.
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
This configuration results in a battery with significantly increased output voltage and energy density, addressing the limitations of existing lithium batteries.
Implementation Method 1
The bipolar current collector is disposed between the first active layer and the second active layer. The first active layer is electrically connected to the second active layer.
Implementation Method 2
The composite current collector is disposed between the third active layer and the fourth active layer. The third active layer is electrically insulated from the fourth active layer.
Data Source
AI summary
An electrode assembly includes an electrode subassembly forming by winding a first electrode plate and a second electrode plate. The first electrode plate includes a first electrode plate unit. The first electrode plate unit includes a bipolar current collector, a first active layer, and a second active layer. The bipolar current collector is disposed between the first active layer and the second active layer. The first active layer is electrically connected to the second active layer. The second electrode plate includes a composite current collector, a third active layer, and a fourth active layer. The composite current collector is disposed between the third active layer and the fourth active layer. The third active layer is electrically insulated from the fourth active layer. The disclosure further provides a battery including the electrode assembly.