Battery Cell Side Reaction Diagnosis Using Voltage and Capacity Deviations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems cannot accurately identify the type of side reactions occurring in battery cells, limiting the ability to set optimal operating conditions.
Innovation Solution
A battery management apparatus and method that measures voltage and capacity deviations at different time points to determine positive and negative electrode side reaction factors, allowing for precise judgment of the type of side reaction and setting appropriate operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacity retention rate information is used to estimate battery degradation, then degradation rate can be estimated, but the type of side reaction cannot be specified
Solution Approach 1:
The patent segments the side reaction analysis into two distinct components: positive electrode side reaction factor and negative electrode side reaction factor. By calculating separate reaction factors for each electrode based on voltage and capacity deviations, the system can identify which specific electrode is experiencing side reactions, thereby specifying the type of side reaction occurring in the battery.
2Measurement precision
If voltage and capacity measurements are taken at multiple time points, then side reaction type can be identified, but measurement complexity increases
Solution Approach 1:
The patent makes the existing voltage and capacity measurement systems multi-functional by utilizing them for both standard state-of-charge monitoring and side reaction type identification. The same voltage sensor and capacity tracking infrastructure is used to calculate voltage deviation and capacity deviation, eliminating the need for separate dedicated measurement devices and reducing overall system complexity.
Solution Approach 2:
The patent introduces voltage deviation and capacity deviation as intermediary parameters that mediate between the raw measurements (voltage at different time points, capacity at different time points) and the final output (side reaction type identification). These intermediary deviations serve as simplified indicators that capture the essential information needed for reaction type classification without requiring complex direct measurements.
3Reliability
If battery operating conditions are not optimized based on side reaction type, then battery can operate freely, but degradation occurs and performance decreases
Solution Approach 1:
The patent implements a feedback mechanism where the identified side reaction type is used to dynamically adjust battery operating conditions. The control unit receives information about which electrode is experiencing side reactions and responds by adjusting charging/discharging rates or voltage limits accordingly, creating a closed-loop system that continuously optimizes battery operation to prevent further degradation and maintain performance.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A battery management apparatus according to an embodiment of the present disclosure includes: a measuring unit configured to measure a first voltage of a battery cell at a first time point and measure a second voltage and a second capacity of the battery cell at a second time point later than the first time point; and a control unit configured to calculate a voltage deviation between the first voltage and the second voltage, calculate a capacity deviation between a first capacity corresponding to the first voltage and the second capacity, determine a positive electrode side reaction factor and a negative electrode side reaction factor for the battery cell based on the voltage deviation and the capacity deviation, and judge the type of a side reaction of the battery cell based on the positive electrode side reaction factor and the negative electrode side reaction factor.