Battery SOH-Based Grid Power Dispatch for Electric Storage Systems
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Solution Overview
Problem
Current systems for managing secondary batteries in vehicles lack efficient methods to optimize battery health and usage, leading to uneven power distribution and potential battery degradation, which affects the reliability of energy storage and release to the power grid.
Innovation Solution
A control apparatus that communicates with vehicles and charging facilities to monitor battery State of Health (SOH) and usage history, prioritizing batteries and electrical appliances based on deterioration levels, and strategically managing charging and discharging to maintain battery margins and prevent overuse, thereby optimizing power transmission to the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batteries are used for power transmission to the grid without management, then energy storage capacity is utilized, but battery deterioration accelerates and reliability decreases
Solution Approach 1:
The control apparatus dynamically adjusts charging and discharging parameters (current, voltage, timing) based on battery SOH values and usage history. Batteries with higher SOH are selected for discharging to the grid, while those with lower SOH are protected or charged, optimizing both power transmission and battery longevity
Solution Approach 2:
The system continuously monitors battery SOH, usage history, and charging/discharging cycles, using this feedback to make real-time decisions about which batteries to charge or discharge. This closed-loop control prevents overuse of degraded batteries and extends overall system reliability
2Productivity
If batteries are charged and discharged frequently for grid power, then energy storage utility increases, but battery lifespan decreases
Solution Approach 1:
The control apparatus modifies operational parameters by adjusting charge/discharge timing and intensity based on individual battery SOH levels. Batteries are cycled differently according to their health status, allowing frequent grid service while protecting battery lifespan through parameter optimization
Solution Approach 2:
The system performs preliminary assessment of battery SOH and usage history before deciding on charge/discharge actions. This advance planning prevents excessive cycling of already degraded batteries, extending lifespan while maintaining energy storage utility
3Device complexity
If all batteries are managed uniformly, then system complexity is reduced, but uneven power distribution and degradation occur
Solution Approach 1:
The control apparatus applies differentiated management strategies to individual batteries based on their specific SOH values and usage histories. Each battery receives customized charge/discharge instructions tailored to its local condition, ensuring uniform power distribution and preventing uneven degradation despite increased management complexity
Data Source
AI summary
A control apparatus, including an acquisition unit configured to acquire a usage history of a plurality of electric storage systems with a battery and an electrical appliance operating when conducting charging and discharging of the battery; and a selecting unit configured to specify a deterioration state or usage of each of the plurality of batteries and deterioration state or usage of each of the plurality of electrical appliances based on the usage history, and select, among the plurality of electric storage systems, an electric storage system that conducts power transmission and reception with the power grid according to the deterioration state or usage of each of the plurality of batteries and the deterioration state or usage of each of the plurality of electrical appliances.