Power Tool Control PCB Mounting Structure for Stable Battery Connection

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Solution Overview

Problem

Existing PCB assemblies face connection failures due to unstable terminals, complex wiring, and limited integration, leading to reliability issues, increased maintenance costs, and obstacles to miniaturization and sophistication.

Innovation Solution

The power tool incorporates an electronic control device with a metal substrate power circuit board, a mounting base, and a connecting assembly that forms a secure mounting space, enhancing stability and integration while simplifying the structure and reducing manufacturing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a soft connection with wires is used to connect the PCB assembly to the power supply, then the assembly is easy to manufacture, but the connection stability is poor and reliability is low

Engineering Contradiction:
Improvemanufacturing easeVSAvoidconnection reliability
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent merges the connection function and support function into a single integrated metal substrate structure. The metal substrate serves as both the structural support base and the electrical connection pathway, eliminating the need for separate wire connections and terminal components. This integration resolves the contradiction by providing both manufacturing simplicity and connection reliability through a unified rigid structure.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the mechanical wire connection system with a direct metal-to-metal contact system. Instead of using flexible wires with terminal connections, the circuit board directly contacts the metal substrate, which is then rigidly connected to the power supply. This substitution eliminates the weak terminal connections while maintaining ease of manufacture through simplified assembly steps.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If a traditional PCB assembly with basic functions is used, then the device complexity is low, but the integration degree is low and space occupation is large

Engineering Contradiction:
Improveassembly complexityVSAvoidspace occupation
Core Design Contradiction:
Device complexityVSVolume of moving object

Solution Approach 1:

The patent combines multiple functions into the metal substrate structure, which serves as the mechanical support base, the electrical connection pathway, and the mounting platform for power components. This multi-function integration reduces the overall space requirement while maintaining simple assembly procedures, resolving the contradiction between low device complexity and reduced space occupation.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The metal substrate is designed to perform multiple functions simultaneously: providing structural support, establishing electrical connections, and serving as a heat dissipation pathway. This multi-functionality allows the system to achieve high integration density without increasing assembly complexity, as the same component fulfills multiple roles.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Ease of manufacture

If a traditional PCB assembly with wires is used, then the manufacturing cost is low, but the wiring method is complicated and manufacturing difficulty is high

Engineering Contradiction:
Improvemanufacturing easeVSAvoidwiring complexity
Core Design Contradiction:
Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent extracts the wiring function from the traditional PCB assembly and integrates it directly into the metal substrate structure. By removing the separate wire routing and terminal connection components, the design eliminates wiring complexity while maintaining manufacturing ease through direct contact and rigid connection methods.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the electrical connection pathways with the structural support framework by using the metal substrate as both the mechanical base and the electrical conductor. This consolidation eliminates the need for separate wiring harnesses and terminal blocks, reducing wiring complexity while simplifying the manufacturing process through fewer assembly steps.

Inventive Principle:
Principle #5Merging (Combining)

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 configuration improves the reliability and integration of the electronic control device, reduces the risk of connection failures, and facilitates miniaturization and cost-effective production, while ensuring efficient heat dissipation and improved user experience.

Implementation Method 1

The power circuit board is made of a metal substrate. The power circuit board is in contact with the mounting base which is a metal base

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The connecting assembly for conductively connecting the battery pack to the electronic control assembly is inserted to the mounting base via the opening

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12255499B2Power tool and electronic control device
Publication Date: 2025.03.18 NANJING CHERVON IND
  • US12255499B2 patent drawing
  • US12255499B2 patent drawing
  • US12255499B2 patent drawing

AI summary

A power tool includes a main body and a battery pack. The main body includes a housing and a motor, a switch assembly, and an electronic control device. The electronic control device is electrically connected to the switch assembly and the motor. The electronic control device includes an electronic control assembly, a mounting base, and a connecting assembly. The electronic control assembly includes a power circuit board. The power circuit board is provided with an opening. The connecting assembly conductively connects the battery pack to the electronic control assembly, connects to the mounting base via the opening, and mates with the mounting base to form a mounting space in which the electronic control assembly is mounted.