Multi-Battery Power Control for Voltage-Imbalance Protection
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Solution Overview
Problem
Electric working machines powered by multiple battery packs connected in parallel face voltage differences that can lead to battery pack failures due to current flow imbalances, potentially damaging internal circuits.
Innovation Solution
A controller is implemented to manage the connection of battery packs, ensuring that only the battery pack with the highest voltage is used to drive the electric device and that the battery pack with the lowest voltage is charged, thereby preventing excessive current flow and reducing the risk of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery packs are connected in parallel to supply electricity to the electric device, then the current value of each battery pack is lowered and electricity can be supplied, but voltage differences between battery packs cause current to flow from high voltage to low voltage battery packs, potentially damaging internal circuits
Solution Approach 1:
The controller performs preliminary voltage comparison of all battery packs before connecting them in parallel. Based on the comparison results, the controller selectively connects only those battery packs whose voltage difference is within a predetermined safe range, preventing harmful current flow while enabling parallel operation for enhanced power supply capability.
2Productivity
If battery packs with voltage differences are connected in parallel, then electricity can be supplied to the electric device, but the current flow from high voltage to low voltage battery packs may reach tolerance values and damage internal circuits
Solution Approach 1:
The controller acts as an intermediary that mediates the connection between battery packs and the electric device. It monitors voltage levels and selectively controls which battery packs are connected, preventing harmful current flow while ensuring continuous electricity supply to the electric device through safe parallel operation.
3Power
If multiple battery packs are used to power the electric working machine, then the power supply capacity is increased, but voltage differences between individual battery packs cause current imbalances that can lead to failures
Solution Approach 1:
The controller performs preliminary voltage comparison of all battery packs before connecting them in parallel. Based on the comparison results, the controller selectively connects only those battery packs whose voltage difference is within a predetermined safe range, preventing harmful current flow while enabling parallel operation for enhanced power supply capability.
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
This solution effectively prevents battery pack failures by managing voltage differences and reducing the risk of damage from current imbalances, ensuring reliable operation of electric working machines.
Implementation Method 1
an electric device (20), electric circuitry (21) electrically connected to the electric device (20), battery packs (22) to be connected to the electric device (20) via the electric circuitry (21)
Data Source
AI summary
An electric working machine includes an electric device, electric circuitry electrically connected to the electric device, battery packs to be connected to the electric device via the electric circuitry, and a controller. The controller is configured or programmed to, in a driving mode, if a voltage difference between the battery packs is greater than a predetermined reference, connect one of the battery packs having a highest voltage to the electric device to drive the electric device.