Battery Health Assessment Using Partial Charge and Discharge Phases
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Solution Overview
Problem
Existing methods for determining the state of health of a battery require strict control of current and voltage during partial charges or discharges, making it difficult to assess battery health during normal operation.
Innovation Solution
A method that splits the battery's state of health into two distinct phases, allowing the overall state of health to be determined from partial charges or discharges without requiring strict control of current or voltage, using equations to calculate health based on accumulated Ah or Wh during these phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete charge or discharge is performed to determine battery state of health, then measurement precision is improved, but device complexity and operational disruption increase
Solution Approach 1:
The patent segments the charge/discharge process into multiple partial cycles, each contributing to the overall state of health assessment. By dividing the complete cycle into manageable partial segments, the system achieves accurate SOH measurement without requiring full discharge/charge operations, thus reducing control complexity and operational disruption.
Solution Approach 2:
The patent applies partial action by performing only the necessary portion of charge/discharge cycles to assess state of health, rather than requiring complete cycles. This partial approach provides sufficient measurement data for accurate SOH determination while avoiding the complexity and operational disruption of complete cycles.
2Measurement precision
If strict control of current and voltage is applied during partial charge/discharge, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the battery system to self-assess its state of health through automated measurement and calculation during normal charge/discharge operations. The system performs self-diagnosis by monitoring voltage, current, and temperature naturally occurring during operation, eliminating the need for external strict control mechanisms and maintaining ease of operation while achieving accurate measurement.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors and evaluates battery parameters during charge/discharge cycles, using this feedback to dynamically adjust measurements and calculations. This feedback approach maintains measurement precision by adapting to actual battery conditions without requiring strict external control, thereby preserving ease of operation.
3Measurement precision
If normal operation is altered to access state of health, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent performs preliminary measurements and calculations during normal charge/discharge operations to assess state of health without requiring separate dedicated testing cycles. By incorporating SOH assessment into routine operations, the system achieves accurate measurement while maintaining full productivity, as no additional operational time or resource allocation is needed.
Solution Approach 2:
The patent merges the state of health assessment function with the normal charge/discharge operations. Instead of separating SOH measurement from regular device operation, the system combines both functions, allowing productivity to be maintained while achieving accurate measurement. The same operational cycles serve both productivity purposes and health assessment purposes.
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
A first aspect of the invention relates to a method for determining the state of health of a battery, called the overall state of health, the voltage feature at the terminals of the battery depending on the state of charge which can be split into a first phase, called phase A, and a second phase, called phase B, phase A and phase B being distinct and consecutive, phase A being associated with a first state of health and phase B being associated with a second state of health, the overall state of health being equal to the sum of the state of health associated with phase A and the state of health associated with phase B; the method being characterised in that the overall state of health of the battery is determined according to at least one measurement of the state of health associated with phase A and/or the state of health associated with phase B. The invention also relates to a device comprising means configured to implement the method.