Battery Pack Controller for Power Tool Current Integration
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Solution Overview
Problem
The challenge in cordless power tools with battery packs is effectively managing cell charging and discharging to prevent overcharge or overdischarge, which can lead to security risks and reduced performance, while conservative management may hinder cell effectiveness.
Innovation Solution
A battery pack system with a controller that detects charge and discharge currents, estimates remaining capacity based on these currents over time, and generates power supply parameters to limit power usage, incorporating sensors for temperature and internal resistance to ensure safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a considerable number of cells are arranged in the battery pack to improve power supply capability, then the power supply capability is enhanced, but the risk of overcharge or overdischarge increases, leading to security risks
Solution Approach 1:
The controller continuously monitors the charge and discharge currents of each cell, calculates remaining capacity in real-time, and adjusts power output accordingly. This feedback mechanism prevents overcharge and overdischarge by dynamically responding to the actual state of the battery pack, resolving the security risk while maintaining high power capability.
Solution Approach 2:
The system performs self-monitoring and self-regulation of the battery cells through the controller that automatically detects current, calculates capacity, and manages power distribution without external intervention. This self-service approach ensures safe operation of multiple cells while maximizing power supply capability.
2Reliability
If conservative security management is applied to prevent overcharge or overdischarge, then security risks are reduced, but the cells cannot work effectively, reducing productivity
Solution Approach 1:
The power supply capability parameter is dynamically adjusted based on real-time remaining capacity calculations rather than using fixed conservative limits. The controller continuously updates the power output limits according to the actual state of charge, allowing cells to work at optimal levels while maintaining security, thus resolving the contradiction between safety and effectiveness.
Solution Approach 2:
The system changes the power supply capability parameter dynamically based on calculated remaining capacity. Instead of maintaining a static conservative power limit, the parameter is adjusted in real-time to match the actual battery state, enabling effective cell utilization while preventing overcharge or overdischarge conditions.
3Measurement precision
If remaining capacity is estimated based on integral of charge/discharge current over time, then accurate capacity management is achieved, but the system complexity increases due to continuous monitoring and calculation requirements
Solution Approach 1:
The controller performs automatic current integration and capacity calculation without requiring external monitoring equipment. The system uses its own built-in computational capabilities to track remaining capacity, reducing overall system complexity while maintaining high measurement precision.
Solution Approach 2:
The controller serves multiple functions: it monitors current, calculates remaining capacity through integration, determines power supply capability parameters, and manages power distribution. This multi-functionality consolidates what could be separate complex subsystems into a single integrated controller, reducing overall device complexity while maintaining accurate capacity estimation.
Data Source
AI summary
A battery pack of a power tool includes a plurality of cells connected in series, a controller, which is configured to detect a charge current and/or a discharge current of the plurality of cells, estimate remaining capacity of the plurality of cells at least base on an integral of the charge current and/or the discharge current of the plurality of cells over time and generate or select a power supply capability parameter for limiting power of the power tool at least base on the remaining capacity of the plurality of cells, and a memory, which is configured to store data related to the remaining capacity of the plurality of cells.