Battery Pack Voltage and Temperature Measurement Circuit Isolation
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Solution Overview
Problem
Conventional battery packs face issues with reduced insulation resistance and incorrect temperature measurements due to electrical connections between voltage and temperature measuring circuits, and complex assembly processes that increase system size and risk of short circuits.
Innovation Solution
A battery pack structure with separated voltage and temperature measuring circuits, where the temperature measuring circuit is directly connected to the BMS, preventing electrical interference and allowing for simple assembly and replacement of voltage measuring members, thereby ensuring accurate voltage and temperature measurements while minimizing system size and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage and temperature measuring circuits are connected via wiring harnesses and connectors, then electrical connection is established, but insulation resistance is reduced and short circuit risk increases
Solution Approach 1:
The patent divides the measuring circuits into separate voltage measuring circuit and temperature measuring circuit, each with independent wiring paths. The voltage measuring member and temperature measuring member are connected to the BMS through separate connectors (CNT1 and CNT2), preventing electrical interference and insulation resistance reduction that would occur if the circuits were combined.
2Measurement precision
If multiple measuring members are installed to monitor battery cells, then measurement accuracy is improved, but assembly complexity and system size increase
Solution Approach 1:
The BMS serves multiple functions by integrating both voltage measurement and temperature measurement capabilities in a single control unit. The voltage measuring circuit and temperature measuring circuit both connect to the same BMS, allowing one device to perform multiple monitoring functions without requiring separate monitoring systems.
3Reliability
If wiring harnesses and connectors are used to connect measuring members to BMS, then electrical connection is achieved, but assembly time and manufacturing cost increase
Solution Approach 1:
The patent separates the voltage measurement function and temperature measurement function into distinct circuits with separate connectors. This segmentation allows for standardized, pre-assembled connector units that can be quickly attached to the BMS, reducing assembly time while maintaining reliable electrical connections through dedicated wiring paths for each measurement type.
Data Source
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AI summary
Disclosed herein is a battery pack including a battery module having a battery cell stack structure in which at least two electrically connected battery cells or unit modules are stacked, a voltage measuring member that measures voltage at an electrode terminal connection part of the battery cells or the unit modules, a voltage measuring circuit that connects the voltage measuring member to a Battery Management System (BMS), a temperature measuring member that measures temperature of the battery cells or the unit modules, a temperature measuring circuit that connects the temperature measuring member to the BMS and that is separated from the voltage measuring circuit, and the BMS electrically connected to the voltage measuring member to control operation of the battery modules.