Battery State of Health Diagnosis via Parallel Balancing
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Solution Overview
Problem
Existing battery management methods are not optimal for diagnosing the state of health (SOH) of batteries composed of multiple accumulators linked in series or parallel, as they require additional phases that immobilize the battery and do not accurately reflect the aging and energy storage capabilities of individual cells.
Innovation Solution
A method that involves a charging or discharging phase followed by a balancing phase, where the electrical quantities representing the balancing of accumulators are measured, allowing for the computation of the state of health (SOH) of each accumulator using the formula SOHi = (X + XEi) × 100 / (X + XEmin), where X is the capacity charged or discharged, and XEi and XEmin are the balancing charges, enabling simultaneous diagnosis during charging or discharging without additional immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery diagnosis methods are used to compute state of health (SOH), then SOH evaluation can be performed, but the battery must be immobilized for additional diagnosis phases which reduces productivity
Solution Approach 1:
The patent combines the SOH diagnosis function with the existing charging/discharging and balancing operations. By measuring electrical quantities (current, voltage, time) during these normal battery operations, the system computes SOH without requiring separate diagnosis phases. This merges multiple functions into existing operational workflows, eliminating the need to immobilize the battery for dedicated diagnosis.
Solution Approach 2:
The patent enables continuous SOH monitoring by performing measurements and computations during ongoing charging, discharging, or balancing operations. The diagnosis process continues uninterrupted alongside these useful actions, rather than requiring the battery to be taken offline. This maintains continuous operational utility while achieving diagnostic goals.
2Measurement precision
If additional diagnosis phases are added to compute SOH, then more accurate aging assessment is achieved, but the device complexity increases
Solution Approach 1:
The patent makes the battery system self-diagnostic by using its own operational data (current, voltage, time measurements during charging/discharging/balancing) to compute its own SOH. The existing battery management system performs these measurements and computations without requiring external diagnostic equipment or complex additional hardware, leveraging resources already present in the system.
Solution Approach 2:
The patent computes SOH by analyzing changes in electrical parameters (current, voltage, time) during standard battery operations. By monitoring how these parameters evolve during charging, discharging, and balancing phases, the system derives aging information from natural parameter variations rather than requiring complex specialized measurement setups.
3Reliability
If battery balancing is performed to equalize accumulator charges, then reliability is improved, but additional time is required which increases loss of time
Solution Approach 1:
The patent performs SOH computations and aging assessments during the balancing phase itself, rather than requiring a separate post-balancing evaluation step. By calculating SOH values while the balancing operation is in progress using the measured electrical quantities, the system obtains diagnostic information without extending the total time required for the balancing process.
Solution Approach 2:
The patent maintains continuous useful action by performing diagnostic computations during the balancing operation rather than requiring a separate immobilized diagnosis phase. The SOH calculation utilizes measurements taken throughout the balancing process, allowing diagnostic evaluation to occur concurrently with the balancing activity and eliminating additional time loss.
Data Source
AI summary
Method for managing a battery comprising several accumulators that can be linked in series or in parallel, comprising a charging or discharging phase during which the accumulators are disposed in series, characterized in that it thereafter comprises a balancing phase comprising the placing of the accumulators in parallel, during which an electrical quantity Gmin representing the balancing of the accumulator that has attained the maximum voltage during the charging phase or minimum voltage during the discharging phase is measured or estimated, and during which an electrical quantity Gi representing the balancing of another accumulator i of the battery is also measured or estimated, and in that the state of health SOHi of this other accumulator i is computed on the basis of the two electrical quantities Gmin and Gi and on the basis of the knowledge of the performance of the accumulator i at the start of life.