Integrated Current Detecting Apparatus for Battery Management
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Solution Overview
Problem
The complexity and high cost of traditional battery management systems for electric vehicles, due to the need for external primary positive and negative circuits and current sensors, hinder the widespread adoption of electric vehicles, and existing solutions like relays have short service life, long response times, and are prone to damage.
Innovation Solution
Integration of primary positive and negative circuits within a current detecting apparatus, using MOS transistors for control and isolation modules to simplify the circuit structure, reduce energy consumption, and eliminate the need for external relays and fuses, allowing real-time control of the battery pack current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external primary positive circuit and primary negative circuit are used with current sensor, then current detection function is achieved, but circuit structure becomes complex and cost increases
Solution Approach 1:
The patent combines the primary positive circuit, primary negative circuit, and current detection function into a single integrated current detecting apparatus. The MOS transistors serve dual purposes as both circuit elements and current sensors, eliminating the need for separate external circuits and current sensors, thus simplifying the overall circuit structure while maintaining detection reliability
Solution Approach 2:
The MOS transistors in the primary circuits serve multiple functions: they act as circuit switching elements, current sensing elements, and protection elements. This multi-functionality reduces the number of components needed and simplifies the circuit structure while achieving reliable current detection and control
2Reliability
If external primary positive circuit and primary negative circuit are used, then current control function is achieved, but cost increases
Solution Approach 1:
The patent merges the primary circuits and current detection apparatus into a single integrated unit, reducing the number of separate components that need to be manufactured and assembled. This integration lowers material costs, assembly costs, and overall system complexity while maintaining effective current control functionality
Solution Approach 2:
The MOS transistors perform multiple functions including current control, current sensing, and circuit protection, eliminating the need for separate components for each function. This multi-functionality reduces the total component count and associated costs while achieving reliable current control
3Ease of operation
If relay is used for circuit control, then switching function is achieved, but service life becomes short and response time increases
Solution Approach 1:
The patent replaces the mechanical relay system with electronic MOS transistor-based switching. The MOS transistors are solid-state devices with no moving parts, eliminating mechanical wear and contact degradation issues. This substitution provides the same switching function while dramatically extending service life and reducing response time through electronic control
Data Source
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AI summary
A current detecting apparatus and a battery management system are provided, wherein: a positive electrode of a power battery pack is connected to a first terminal of a primary positive circuit (130), a negative electrode of the power battery pack is connected to a first terminal of a primary negative circuit (140), and a current sensor (110) is connected in series between the negative electrode of the power battery pack and the first terminal of the primary negative circuit (140); the current sensor (110) is configured for obtaining and outputting a voltage signal of the power battery pack; a microcontroller unit (120) is configured for implementing current conversion on the voltage signal, transmitting a detected current value of the power battery pack and receiving a control command for controlling the primary positive and negative circuits to turn on or turn off.