Battery Pack Selective Block Control for Current Imbalance
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Solution Overview
Problem
The parallel interconnection of battery blocks in battery packs can lead to variations in charged amounts causing current flow between blocks, reducing reliability due to potential short circuits and lowering internal resistance, resulting in excessive voltage and current to motors, which can damage them.
Innovation Solution
A battery pack with conduction/interruption units and a control unit that selectively connects battery blocks to external devices based on state detection, preventing current flow between blocks and maintaining balanced charging/discharging, and using a DC/DC converter to stabilize voltage and prevent overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery blocks are parallelly interconnected to increase storable electric energy, then battery capacity is improved, but current flows from battery blocks with higher output voltage to those with lower output voltage causing reliability degradation
Solution Approach 1:
The battery pack is divided into multiple independent battery blocks, each with its own conduction/interruption unit. This segmentation allows individual control of each battery block's connection to external devices, preventing harmful current flow between blocks while maintaining the increased capacity benefit of multiple blocks.
Solution Approach 2:
Conduction/interruption units are introduced as intermediary components between the battery blocks and external devices. These units act as switches that control current flow, allowing the system to selectively connect or disconnect individual battery blocks based on their state, thereby preventing reliability degradation while maintaining capacity.
2Quantity of substance
If multiple battery blocks are parallelly interconnected to increase battery capacity, then storable electric energy is improved, but internal resistance is lowered causing excessive voltage and current to external devices
Solution Approach 1:
The conduction/interruption units enable dynamic control of battery block connections based on real-time state detection. The control unit can selectively activate or deactivate individual battery blocks, adjusting the overall internal resistance and output characteristics to prevent excessive voltage and current to external devices while maintaining high capacity.
3Reliability
If battery blocks are selectively connected based on state detection, then reliability is improved by preventing current imbalances, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The state detection unit continuously monitors each battery block's state and provides this information to the control unit, which automatically makes connection decisions. This self-service mechanism reduces the need for complex external control systems while maintaining high reliability through automated, state-based management of battery block connections.
Data Source
AI summary
A battery pack in one aspect of the present disclosure comprises: a plurality of battery blocks, a plurality of conduction/interruption units, and a control unit. The control unit selects one battery block to be electrically connected to an external device from among the plurality of battery blocks, on the basis of detection results obtained from a state detection unit, and sets the conduction/interruption unit corresponding to the selected battery block to a conducting state.