Battery Pack Fusion Maintenance Balancing Voltage and Capacity
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Solution Overview
Problem
Current maintenance methods for power battery packs, such as voltage-based and capacity-based methods, face challenges in accurately balancing battery capacity and extending service life due to inconsistencies in battery capacity and performance, leading to excessive charging and discharging risks and reduced utilization rates.
Innovation Solution
An improved maintenance method that analyzes real-time characteristic data of battery packs to identify cells needing charging or discharging maintenance, controlling the ratio of cells requiring maintenance through a fusion maintenance approach, which normalizes voltage and state of charge data to determine maintenance levels and thresholds, thereby ensuring consistency and extending battery pack life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage-based maintenance method is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent combines voltage-based maintenance method (easy to operate) with capacity-based maintenance method (high precision) into a fusion maintenance method. The system calculates both voltage difference and capacity difference, then determines maintenance priority based on both parameters, achieving both ease of operation and measurement precision.
Solution Approach 2:
The patent changes the maintenance determination parameters from single voltage parameter to dual parameters (voltage difference and capacity difference). By introducing capacity-based parameters alongside voltage parameters, the system achieves more precise measurement while maintaining operational simplicity through automated calculation.
2Measurement precision
If capacity-based maintenance method is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges voltage-based maintenance (simple device) with capacity-based maintenance (precise but complex device) into a unified fusion maintenance system. The system uses a single maintenance determination module that processes both voltage and capacity data, avoiding the need for separate complex capacity measurement devices while achieving precise maintenance determination.
Solution Approach 2:
The maintenance determination module performs multiple functions: it calculates voltage difference, calculates capacity difference, determines maintenance priority, and controls maintenance charging/discharging. This multi-functional module reduces overall device complexity by consolidating what would otherwise require separate specialized devices.
3Stability of the object's composition
If maintenance is performed on all batteries, then consistency is improved, but loss of energy increases
Solution Approach 1:
The patent applies local quality by performing maintenance only on specific batteries that have high maintenance priority, rather than uniformly maintaining all batteries. The system calculates maintenance priority for each battery based on voltage and capacity differences, then selectively applies maintenance to those most needing it, reducing unnecessary energy loss while maintaining consistency.
Solution Approach 2:
The patent uses partial action by performing maintenance on only a subset of batteries (those with high maintenance priority) rather than all batteries. The maintenance determination module identifies specific batteries requiring maintenance and applies maintenance only to them, achieving sufficient consistency improvement without the excessive energy loss of universal maintenance.
Data Source
AI summary
An improved maintenance method of a power battery pack is disclosed herein, comprising the following steps: (1) conducting analysis on battery pack; (2) data preprocessing; (3) conducting normalization processing of voltage data volavgi obtained in (2) and state of charge SOCi, state of health SOHi of single cells respectively; (4) calculating the charging and discharging levels of single cell that needs to maintain, and determining the battery sets that require charging and discharging maintenance. The maintenance method of power battery pack in the invention can perform analysis of various characteristic data of battery in a real-time manner and pick up the single cells that need charging and discharging maintenance during battery pack operation, and control the ratio of number of batteries that need charging maintenance to that needs discharging maintenance, to achieve bus balance.