Multi-Assembly Battery Cell Layout for Balanced Polarization
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Solution Overview
Problem
Power batteries experience capacity attenuation due to inconsistent electrochemical polarization across different electrode assemblies, leading to reduced service life, as electrode assemblies farther from the case experience higher temperatures and wider state of charge usage ranges.
Innovation Solution
The battery cell design includes a cavity with distinct regions for electrode assemblies, where the polarization parameter of assemblies closer to the case is lower than those farther away, balancing the degree of delithiation across regions to match the degree of capacity attenuation, thereby extending the battery's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode assemblies are arranged in the cavity with different positions, then the battery cell can accommodate multiple electrode assemblies, but the electrode assemblies farther from the case experience higher temperatures and wider state of charge usage ranges, leading to inconsistent capacity attenuation
Solution Approach 1:
The patent applies local quality by setting different polarization parameters for electrode assemblies based on their positions in the cavity. Specifically, the first electrode assembly (closer to the case) has a first polarization parameter, while the second electrode assembly (farther from the case) has a second polarization parameter that is higher than the first. This localized parameter adjustment compensates for the temperature and state of charge usage range differences experienced by electrode assemblies at different positions, ensuring consistent capacity attenuation across all assemblies.
2Duration of action of stationary object
If the polarization parameter of electrode assemblies is increased to balance delithiation, then the service life of the battery cell is extended, but the device complexity increases due to region division and parameter control
Solution Approach 1:
The patent applies segmentation by dividing the cavity into distinct regions based on proximity to the case. The cavity is divided into a first region (closer to the case) and a second region (farther from the case), with electrode assemblies assigned to different regions. This segmentation allows for differentiated polarization parameter control, where electrode assemblies in the first region use a first polarization parameter and those in the second region use a second polarization parameter, thereby extending service life through manageable regional control.
3Volume of stationary object
If electrode assemblies are placed closer to the middle of the case, then more space is utilized, but the operating temperature increases and actual state of charge usage range widens, causing faster capacity attenuation
Solution Approach 1:
The patent applies parameter changes by adjusting the polarization parameters of electrode assemblies based on their positions. When electrode assemblies are placed in different regions of the cavity, their polarization parameters are changed accordingly: the first electrode assembly has a first polarization parameter, while the second electrode assembly has a second polarization parameter that is higher. This parameter adjustment compensates for the harmful effects of temperature rise and widened state of charge usage range, allowing effective utilization of cavity space while preventing faster capacity attenuation.
Data Source
AI summary
The present application provides a battery cell, a battery and an electrical apparatus, which belong to the technical field of batteries. The battery cell includes a case and at least three electrode assemblies; a cavity is defined in the case, the cavity includes a first region and a second region, the first region is closer to the case than the second region, a polarization parameter of a single electrode assembly located in the first region is PA, a polarization parameter of a single electrode assembly located in the second region is PB, and PA<PB.