Power Tool Battery State Detection for Undervoltage Power-On Blocking
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Solution Overview
Problem
Existing power tools face challenges in providing timely protection and power saving for battery packs, particularly when undervoltage conditions occur, leading to potential damage or waste of battery pack power.
Innovation Solution
A discharging system comprising a battery pack and a power tool, where the battery pack includes a controller and a state detection terminal connected to the power tool's power-on module. This module controls the power tool's power-on state based on the battery pack's state, preventing unnecessary power consumption and ensuring timely protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack continues to provide power to the power tool for protection operation when undervoltage abnormality occurs, then the controller can perform protection, but the battery pack consumes power continuously and cannot be protected in time leading to power waste or damage
Solution Approach 1:
The power-on module detects battery pack state in advance through the state detection terminal before the controller needs to perform protection operations. When abnormality is detected, the power-on module proactively disconnects the power supply module from the controller, preventing the battery pack from continuing to consume power during undervoltage conditions.
Solution Approach 2:
The power-on module acts as an intermediary between the battery pack and the controller. It receives state information from the battery pack via the state detection terminal and controls the power supply module accordingly, enabling timely disconnection when abnormality is detected, thus resolving the contradiction between providing protection and avoiding power waste.
2Reliability
If the state indication terminal is connected to the tool control unit, then the tool can perform protection when abnormality occurs, but the protection cannot be performed in time as the battery pack needs to be assembled and trigger switch closed first
Solution Approach 1:
The state detection function is extracted from the tool control unit and relocated to the battery pack itself. The battery pack includes a state detection terminal that independently detects its own state and communicates it to the power-on module, enabling the battery pack to autonomously initiate protection actions without waiting for the tool control unit.
Solution Approach 2:
The battery pack performs self-detection of its state through the state detection terminal and autonomously controls the power-on module to disconnect power when abnormality is detected. This self-service mechanism eliminates the delay caused by waiting for tool control unit intervention, achieving immediate protection response.
3Reliability
If the power-on module is connected to the state detection terminal, then the power tool can be controlled not to power on when battery is abnormal, but requires additional circuit components
Solution Approach 1:
The power-on module serves multiple functions: it detects battery pack state through the state detection terminal, controls the power supply module based on detected state, and manages the overall power-on/off of the power tool. By combining these functions into a single module, the circuit structure remains relatively simple while achieving reliable abnormality protection.
Data Source
AI summary
Disclosed in the present application are a power tool and a discharging system. A battery pack includes a first positive terminal, a first negative terminal, a first controller, and a first state detection terminal. The power tool includes a second positive terminal, a second negative terminal, a second controller, a power supply module for supplying power to the second controller, and a power-on module connected to the power supply module. When the battery pack is connected to the power tool by insertion, the power-on module is connected to the first state detection terminal; and the first state detection terminal controls on/off of the power-on module according to the state of the battery pack, so as to control whether to power on the power tool.