Battery State Indicator with Type-Specific Threshold Memory
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric construction tools with battery state indication devices cannot accurately indicate the voltage state of different types of battery packs when multiple types are selectively attached.
Innovation Solution
A battery state indication device with a voltage measurement unit, battery identification unit, threshold memory, control unit, and indicator, which measures and compares voltage thresholds specific to each battery pack's rated output voltage to determine and display the state of charge using LEDs, ensuring accurate indication across various battery types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single voltage threshold is used for battery state indication, then the device structure is simple, but it cannot accurately indicate the state of charge for battery packs with different rated output voltages
Solution Approach 1:
The patent divides the voltage threshold reference into multiple segments corresponding to different battery pack types. The threshold memory stores separate voltage threshold sets for each battery pack rated output voltage (e.g., 18V, 36V, 54V). When a battery pack is attached, the system identifies its type and selects the corresponding threshold segment, enabling accurate state indication for each battery type without using a single universal threshold that would compromise precision.
Solution Approach 2:
The patent pre-stores multiple sets of voltage thresholds in the threshold memory before operation, organized according to different battery pack specifications. This preliminary preparation allows the control unit to quickly retrieve and apply the appropriate threshold set once battery identification is made, avoiding real-time calculations and ensuring rapid accurate indication.
2Measurement precision
If multiple voltage thresholds are stored for different battery types, then accurate state indication is achieved, but the threshold memory becomes more complex
Solution Approach 1:
The threshold memory is designed with multi-functionality to serve multiple battery pack types simultaneously. A single threshold memory unit handles indication for various battery rated output voltages (18V, 36V, 54V, etc.) by organizing thresholds in a structured manner that allows selective access. This universal design eliminates the need for separate indication devices for each battery type, achieving measurement precision across all types while managing memory complexity through efficient organization.
Solution Approach 2:
The patent changes the parameter organization within the threshold memory based on battery pack identification. Instead of a fixed single threshold, the system dynamically selects and applies different threshold parameters (voltage levels) corresponding to the identified battery type. This parameter change approach allows the same hardware structure to achieve high measurement precision for multiple battery configurations.
3Adaptability or versatility
If the battery state indication device is selectively connectable to multiple battery pack types, then versatility is improved, but the indication accuracy deteriorates without type-specific thresholds
Solution Approach 1:
The patent introduces battery identification as an intermediary step between battery connection and state indication. The battery identification unit acts as a mediator that recognizes the attached battery pack type and triggers the selection of appropriate voltage thresholds from the threshold memory. This intermediary mechanism enables the system to maintain high versatility by accepting multiple battery types while preserving indication accuracy through type-specific threshold application.
Solution Approach 2:
The patent implements dynamic threshold selection based on real-time battery identification. Instead of using fixed thresholds, the system dynamically adjusts the voltage thresholds according to the detected battery pack type. This dynamic adaptation allows the indication device to seamlessly handle multiple battery pack types with different voltage characteristics, maintaining both versatility and measurement precision through real-time parameter adjustment.
Data Source
Figure 1
Figure 2~4
AI summary
A battery state indication device includes a control circuit (21) that reads a plurality of voltage thresholds corresponding to an identified battery pack (12) from a threshold memory (21a) and compares the voltage of the battery pack (12) measured by the voltage measurement unit (23) with the read voltage thresholds to determine the voltage state of the battery pack. Then, a voltage indicator (24) indicates the voltage state of the battery pack determined by the control circuit (21).