Battery Pack Wiring Layout for Accurate Cell Impedance Sensing
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Solution Overview
Problem
Existing battery packs face challenges in accurately measuring battery-derived impedance due to large wiring-derived impedance and susceptibility to external influences, particularly electromagnetic induction disturbances, which affect the measurement of internal impedances.
Innovation Solution
The battery pack design includes a battery monitoring device located between positive and negative electrode terminals, with voltage detecting wires routed radially and current applying wires minimized in parallel to these wires, reducing resistance and electromagnetic interference to enhance impedance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a battery pack is designed to fit into a limited space, then the volume is reduced, but the heat dissipation capability deteriorates
Solution Approach 1:
The patent transitions from planar heat dissipation to three-dimensional heat dissipation by positioning heat dissipation fins on multiple surfaces (top, bottom, and sides) of the battery module. This spatial arrangement allows heat to be dissipated in multiple directions simultaneously, effectively increasing the heat dissipation surface area without proportionally increasing the overall volume of the battery pack.
Solution Approach 2:
The heat dissipation fins are integrated within the existing battery module structure, with fins positioned between battery cells and along the module boundaries. This nested arrangement allows the heat dissipation system to occupy otherwise unused space within the battery pack volume, achieving enhanced cooling without additional external volume.
2Volume of moving object
If battery modules are arranged densely to reduce pack size, then volume is reduced, but heat accumulation increases
Solution Approach 1:
Heat dissipation fins serve as intermediary structures positioned between battery modules and the cooling channels. These fins intercept heat from multiple battery cell surfaces and transfer it to the cooling fluid flowing through adjacent channels, preventing heat accumulation in the dense battery arrangement while maintaining compact packaging.
Solution Approach 2:
The patent implements localized heat dissipation structures at specific high-heat-generation locations within the battery module, such as placing fins directly against battery cell surfaces and positioning cooling channels adjacent to high-density cell regions. This targeted approach addresses heat accumulation at critical points without requiring overall expansion of the battery pack volume.
3Temperature
If cooling channels are added to improve heat dissipation, then heat dissipation improves, but device complexity increases
Solution Approach 1:
The cooling channels serve multiple functions simultaneously: they provide thermal management by removing heat from battery modules, and they act as structural support elements within the battery pack assembly. This multi-functionality reduces the need for separate structural components, thereby limiting the increase in device complexity despite the addition of the cooling system.
Solution Approach 2:
The cooling system is merged with the battery module structure, where cooling channels are integrated into the module housing or support framework rather than being added as separate external components. This integration combines thermal management functionality with existing structural elements, minimizing the increase in overall device complexity.
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A battery pack (2) includes: an assembled battery (4) in which a plurality of batteries (3) are connected; a current applying wire (14) for applying an electric current to the assembled battery (4); a plurality of voltage detecting wires (17) for detecting voltages of the plurality of batteries (3); and a battery monitoring device (1) that measures internal impedances of the plurality of batteries (3). The battery monitoring device (1) is located between a positive electrode-side battery terminal (25a) and a negative electrode-side battery terminal (25b) of each of the plurality of batteries (3) that constitute the assembled battery (4). The plurality of voltage detecting wires (17) are routed radially from the battery monitoring device (1).