Battery Pack PCB Layout for Cell Voltage Sensing and Heat Control
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Solution Overview
Problem
Existing battery packs face challenges in efficiently managing power output and heat dissipation, particularly in high-power applications like electric vehicles, where multiple battery cells are connected in series or parallel configurations, leading to complex wiring and potential overheating issues.
Innovation Solution
A battery pack design featuring a circuit board that gathers voltage information from alternating end portions of battery cells, using connection members and busbars for series or parallel connections, with integrated cooling channels and venting systems to manage heat and gas discharge, optimizing cell arrangement for efficient power distribution and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a battery pack includes a plurality of battery cells connected in series to achieve high voltage, then the output voltage is improved, but the risk of thermal runaway propagating across cells increases
Solution Approach 1:
The battery pack is divided into multiple independent battery cell modules, each with its own protective housing and thermal management structure. This segmentation isolates thermal runaway events to specific modules, preventing propagation to the entire battery pack while maintaining high voltage through series connection of the modules.
Solution Approach 2:
Thermal barriers and insulating materials are introduced as intermediary elements between adjacent battery cells. These intermediaries absorb and block heat transfer, acting as a protective buffer that prevents thermal runaway from propagating from one cell to another, thereby enabling high voltage operation with reduced thermal risk.
2Measurement precision
If connection holes are exposed on the circuit board to measure voltage of adjacent battery cells, then voltage measurement capability is improved, but the circuit board structure becomes more complex
Solution Approach 1:
The circuit board is designed with multi-functional connection holes that serve both as mounting points for electronic components and as access points for voltage measurement. This universal design allows the same structural element to fulfill multiple functions, enabling voltage measurement of adjacent battery cells without adding separate measurement infrastructure that would increase complexity.
3Loss of information
If connectors are placed between battery cells for voltage measurement, then voltage information gathering is improved, but the manufacturing process becomes more difficult
Solution Approach 1:
The voltage measurement connectors are merged with the existing battery cell assembly structure rather than being added as separate components. The connectors are integrated into the housing or mounting structure that already holds the battery cells, allowing voltage information gathering to be achieved through the same manufacturing processes used for cell assembly, thereby avoiding additional manufacturing complexity.
Data Source
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AI summary
Described is a battery pack which includes a plurality of battery cells, a circuit board on the plurality of battery cells to gather voltage information of the plurality of battery cells, the circuit board including at least one connection hole exposing at least a part of each of a pair of adjacent battery cells of the plurality of battery cells, and a plurality of connectors between the plurality of battery cells and the circuit board, the plurality of connectors being voltage measurement lines.