Battery Power Converter Abnormality Current Limiting
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Solution Overview
Problem
Conventional battery systems face challenges in safely discharging a battery pack when an abnormality is detected, as the discharge current is reduced, taking time to reach a safe state, and there's a risk of exceeding permissible current values, leading to heat generation issues.
Innovation Solution
A power storage system with a battery apparatus, a power converter, and a battery monitoring circuit that controls power supply to maintain safety by restricting discharge current or power within set limits, and includes a switching unit to disconnect the battery when voltage is low, and temperature detection to adjust discharge current, ensuring safe discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge current is determined by the terminal voltage of the secondary battery and the discharge resistance, then the discharge current is reduced, but it takes some time to discharge to a safe state
Solution Approach 1:
The patent applies dynamics by making the discharge current adjustable rather than fixed. The control unit dynamically changes the discharge current based on the battery's charging state and temperature conditions, allowing the system to transition from a static resistance-based discharge to a dynamic controlled discharge that adapts to real-time conditions.
Solution Approach 2:
The patent changes the parameter of discharge current from being passively determined by terminal voltage and resistance to being actively controlled within a permissible range. The control unit adjusts the discharge current parameter based on battery state, enabling faster discharge when safe and preventing excessive current when risky.
2Reliability
If the discharge current is determined by the terminal voltage of the secondary battery and the discharge resistance, then the discharge current is reduced, but there is a risk of the discharge current becoming greater than a permissible current value
Solution Approach 1:
The patent implements feedback by continuously monitoring the battery's charging state and temperature, then using this information to adjust the discharge current. The control unit receives feedback about battery conditions and modifies the discharge current accordingly, preventing excessive current that would cause harmful heat generation while maintaining safety.
Solution Approach 2:
The system dynamically adjusts the discharge current based on real-time battery conditions rather than using a fixed current determination method. This dynamic control prevents the discharge current from exceeding permissible values under various charging states, thereby eliminating the risk of excessive heat generation.
3Object-generated harmful factors
If the discharge current is reduced to ensure safety, then heat generation is controlled, but it takes longer to discharge the battery to a safe state
Solution Approach 1:
The patent resolves this contradiction by making the discharge current dynamic rather than statically reduced. The control unit increases discharge current when battery conditions permit (reducing discharge time) and decreases it when conditions require safety (controlling heat generation), achieving both goals through adaptive control.
Solution Approach 2:
The system changes the discharge current parameter based on battery state, allowing higher currents when safe and lower currents when necessary. This parameter adjustment enables the system to discharge faster when possible while still controlling heat generation when required, resolving the time-heat contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces battery voltage while ensuring safety by controlling discharge current and temperature, preventing excessive heat generation and maintaining a safe battery state.
Implementation Method 1
a power converter that is provided between the battery apparatus and a load and that can control power supplied from the battery apparatus to the load
Implementation Method 2
a battery monitoring circuit that detects an abnormality in the battery apparatus
Implementation Method 3
when an abnormality in the battery apparatus is detected by the battery monitoring circuit, the power converter supplies power stored in the battery apparatus to the load or to an internally provided internal load at or below a current value or power value that is set in advance
Data Source
AI summary
An object is to improve safety. Provided is a power storage system including a battery apparatus 1; a power converter 2 provided between the battery apparatus 1 and a load 3 and that can control power supplied from the battery apparatus 1 to the load 3; and a battery monitoring circuit 4 that detects an abnormality in the battery apparatus 1. When an abnormality in the battery apparatus 1 is detected by the battery monitoring circuit 4, the power converter 2 supplies power stored in the battery apparatus 1 to the load 3 or to an internally provided internal load at or below a current value or power value that is set in advance, or alternatively, at a current value or power value that the load 3 demands, within a range that does not exceed an upper limit that is set in advance.