Accumulator Battery Abnormality Control via Dynamic Current Limiting
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Solution Overview
Problem
Existing accumulator battery systems fail to effectively manage minor short-circuiting abnormalities, leading to potential overheating and damage, especially in hybrid and electric vehicles, while also causing significant disruptions to the load using the battery.
Innovation Solution
An accumulating system that includes a charging/discharging control portion, an abnormality detecting portion, and an abnormality processing portion, which narrows the control range for charging/discharging when an abnormality is detected, limiting the process only when it exceeds safe limits to prevent battery damage with minimal impact on the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging/discharging is stopped upon detection of abnormality, then battery protection is improved, but system productivity deteriorates
Solution Approach 1:
The patent changes the parameter of charging/discharging current by introducing a limited current value when abnormality is detected. Instead of completely stopping charging/discharging, the system modifies the current parameter to a safer level that prevents battery damage while still allowing power flow to maintain system productivity.
2Reliability
If charging/discharging current is suppressed, then battery safety is improved, but load effect deteriorates
Solution Approach 1:
The patent applies partial action by selectively limiting charging/discharging current only when abnormality is detected, while allowing normal current flow when no abnormality is present. This partial application of current limitation protects the battery without unnecessarily affecting load operation during normal conditions.
Solution Approach 2:
The system dynamically adjusts the charging/discharging current based on the detected state. When abnormality is detected, the current is changed to a limited value; when no abnormality is detected, normal current flow is maintained. This dynamic adjustment optimizes both battery safety and load performance based on real-time conditions.
Data Source
AI summary
When minor short-circuiting abnormality of a battery is determined at timing t4, a battery ECU turns on a fail-safe flag to perform a fail-safe process. In the fail-safe process, the battery ECU changes a discharging power limiting value from a first discharging power limiting value to a second discharging power limiting value that is smaller than the first discharging power limiting value as time elapses, and changes a charging power limiting value from a first charging power limiting value to a second charging power limiting value that is greater than the first charging power limiting value as time elapses.