Automotive Diagnostic Tablet Battery Pack for Accurate Power Sensing
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Solution Overview
Problem
In automotive diagnostic tablets, the voltage drop due to internal resistance in the battery connector, wires, and PCB traces leads to significant errors in battery power detection, especially at higher currents.
Innovation Solution
A battery design that includes a first resistor connected between the battery cell's negative electrode and the negative electrode interface, and a protection chip with a power detection end connected to the resistor, which detects power information and sends it to a microprocessor via a communication interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltameter chip is placed at the main board end together with a charging chip and electrically connected to the battery via a battery connector, then the battery power detection function is achieved, but voltage drop occurs due to internal resistance of connector, wire, and PCB trace leading to large detection errors
Solution Approach 1:
The voltameter chip is extracted from the main board and integrated directly into the battery pack. This separates the power detection function from the main control board, allowing direct measurement at the battery terminals without the influence of connector and trace resistance, thereby eliminating voltage drop errors.
Solution Approach 2:
A dedicated detection circuit with voltameter chip is introduced as an intermediary component between the battery terminals and the detection system. This intermediary enables direct power measurement at the battery level, isolating the measurement path from the problematic connector and PCB trace pathways that cause voltage drop.
2Productivity
If the current increases to meet high battery charging and discharging requirements, then the battery endurance and charging speed are improved, but the voltage drop increases leading to greater detection errors
Solution Approach 1:
The system is segmented into separate functional modules: the battery pack with integrated voltameter chip for local power measurement, and the main board for control and communication. This segmentation allows high current operation without compromising measurement accuracy, as the detection path is physically separated from the high-current power paths.
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 design reduces power detection errors in automotive diagnostic tablets by directly detecting the power state of the battery cell with high accuracy, even at higher currents.
Implementation Method 1
a first resistor, wherein one end of the first resistor is connected to the negative electrode of the battery cell, and the other end of the first resistor is connected to the negative electrode interface
Data Source
AI summary
The present application provides a battery that has application in automotive diagnostic tablets. The battery includes a battery cell, a positive electrode interface, and a negative electrode interface. The positive electrode of the battery cell is connected to the positive electrode interface. The battery further includes a first resistor and a protection chip. A first end of the first resistor is connected to the negative electrode of the battery cell, and the other end of the first resistor is connected to the negative electrode interface. The protection chip includes a power detection end and a communication interface, and the power detection end is connected to the first resistor. The protection chip is used to detect the power information of the battery cell by means of the power detection end, and the power information is sent by means of the communication interface to a microprocessor.