Battery Pack Memory for Power Tool Compatibility
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Solution Overview
Problem
Existing power tool systems require time to determine whether a battery pack is usable based on rated capacity and output voltage information, and there is a need to shorten this determination time for both battery pack usage and charging compatibility.
Innovation Solution
A power tool system that includes a battery pack with a memory storing identification information in the smallest unit for communication with a charger and power tool body, along with determination units in each component to quickly assess compatibility using pre-stored identification information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If determination is performed based on rated capacity and rated output voltage information, then compatibility can be verified, but determination time increases
Solution Approach 1:
The patent applies preliminary action by pre-storing identification information in the battery pack memory before actual use. The battery pack contains identification information that corresponds to its rated capacity and rated output voltage, allowing the power tool body to quickly determine compatibility by simply comparing this pre-stored identification information against stored reference data, rather than performing complex verification calculations during the determination phase.
2Measurement precision
If detailed battery information is stored and verified, then compatibility accuracy improves, but data processing time increases
Solution Approach 1:
The patent applies the extraction principle by isolating and storing only the essential identification information in the battery pack memory that corresponds to rated capacity and rated output voltage. This extracted identification information is sufficient for compatibility determination, allowing the power tool body to quickly verify compatibility by comparing this condensed data against pre-stored reference identification information, thereby achieving both accuracy and speed.
3Reliability
If multiple pieces of battery information are checked, then usability determination becomes more reliable, but the complexity of the determination process increases
Solution Approach 1:
The patent applies parameter changes by transforming multiple battery parameters (rated capacity, rated output voltage) into a single identification information value that is stored in the battery pack memory. This parameter transformation simplifies the determination process in the power tool body, which only needs to compare the single identification information value against pre-stored reference data, thereby maintaining reliability while reducing process complexity.
Data Source
AI summary
A power tool system includes a battery pack, a charger connectable to the battery pack, and a power tool body connectable to the battery pack. The battery pack includes a battery pack memory that stores identification information in a smallest unit allowing for communication with the charger and the power tool body. Each of the charger and the power tool body includes a device memory that stores at least one piece of identification information of a usable battery pack. Each of the charger and the power tool body or the battery pack includes a determination unit that determines whether or not the at least one piece of identification information stored in the device memory includes the identification information stored in the battery pack memory.