Series Battery Deterioration Detection Using Voltage Extremes
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Solution Overview
Problem
In battery systems where multiple batteries are connected in series, determining the deterioration variance among batteries without complicating the data acquisition process is challenging, especially in systems where batteries have varying internal states due to reuse or aging, which can lead to uneven load distribution and safety risks.
Innovation Solution
A determination device that estimates internal state parameters based on maximum and minimum voltage variations during charge or discharge cycles, comparing these parameters to determine deterioration variance among batteries and ensuring balanced performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal state parameters are estimated for all batteries to determine deterioration variance, then determination accuracy is improved, but data acquisition complexity and processing load increase
Solution Approach 1:
The patent segments the batteries into two groups: representative batteries (first batteries) whose internal state parameters are estimated, and non-representative batteries (second batteries) whose parameters are not estimated. This segmentation allows accurate deterioration variance determination through representative samples while avoiding the complexity of measuring all batteries.
Solution Approach 2:
The patent uses the voltage variation characteristics of representative batteries to infer the state of the entire battery group. The representative batteries serve themselves as indicators of the overall system state, eliminating the need for direct measurement of all batteries.
2Measurement precision
If voltage measurements are taken frequently to track deterioration, then determination accuracy is improved, but data amount and processing complexity increase
Solution Approach 1:
The patent applies partial action by measuring voltage variations only for representative batteries rather than all batteries. This partial measurement approach provides sufficient information for deterioration variance determination while significantly reducing the quantity of data to be processed and stored.
3Reliability
If all battery internal states are monitored individually, then safety is improved, but system complexity and cost increase
Solution Approach 1:
The patent makes the voltage measurement system multi-functional by using voltage variations of representative batteries to simultaneously assess the state of multiple other batteries. This universal approach maintains safety through accurate deterioration variance determination while reducing monitoring system complexity.
Data Source
AI summary
According to one embodiment, a determination device relating to a plurality of batteries connected in series is provided. The determination device includes a processor. The processor determines a deterioration variance among the batteries, based on first voltage data indicative of a maximum voltage which is greatest among voltages of the batteries in each of measurements in a plurality of periods in charge or discharge of the batteries, and second voltage data indicative of a minimum voltage which is least among the voltages of the batteries in each of the measurements in the periods.