Battery Pack Sensing Layout for Accurate Cell State Detection
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Solution Overview
Problem
Existing battery packs lack an efficient sensing structure for accurately obtaining state information such as voltages, currents, and temperatures of battery cells, which is crucial for optimal performance and safety, especially in applications like electric vehicles and mobile devices.
Innovation Solution
A battery pack design featuring a circuit board with connection tabs and detection members that connect to battery cells, allowing for parallel and series connections, along with a thermistor for temperature detection, to facilitate the collection of state information and improve monitoring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional battery pack structure without dedicated sensing components is used, then the device complexity is reduced and manufacturing is easier, but the measurement precision of battery cell state information (voltages, currents, temperatures) deteriorates
Solution Approach 1:
The patent combines multiple sensing functions (voltage detection, current detection, temperature detection) into an integrated sensing structure where the circuit board serves as both the electrical connection substrate and the mounting platform for all sensing components. The connection tabs integrate both current carrying and sensing capabilities, while the single thermistor handles temperature monitoring for multiple cells, thereby improving measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The circuit board performs multiple functions simultaneously: it provides electrical connections between battery cells, mounts sensing components, serves as a structural support, and routes signals. The connection tabs serve dual purposes of current conduction and voltage sensing. This multi-functionality allows the patent to achieve comprehensive state monitoring while minimizing the number of separate components and reducing overall system complexity.
2Reliability
If multiple separate sensing components are added to each battery cell, then the measurement precision and reliability improve, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the sensing components onto a single circuit board rather than distributing separate sensors to each battery cell. This consolidation maintains reliable monitoring of all cells while significantly simplifying the manufacturing process, as the circuit board can be pre-assembled with all sensing components before being installed as a single unit in the battery pack.
Solution Approach 2:
The circuit board acts as an intermediary structure that centralizes all sensing functions. Instead of directly attaching multiple sensors to each battery cell (which would be complex and error-prone), the circuit board provides a standardized interface for mounting sensing components and routing connections to all cells, thereby improving both reliability and ease of manufacture.
3Ease of operation
If a compact battery pack design without extended connection structures is used, then the volume is reduced, but the ease of operation for connecting sensing components deteriorates
Solution Approach 1:
The patent resolves the volume-accessibility contradiction by changing the spatial arrangement from horizontal extension to vertical stacking. The circuit board is positioned vertically between battery cells, with connection tabs extending upward and downward along the vertical axis. This dimensional reorganization allows sensing components to be easily accessible on the vertical surfaces while maintaining a compact horizontal footprint, thereby improving ease of operation without significantly increasing battery pack volume.
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 enhances the ability to monitor and manage battery state information, leading to improved performance, safety, and capacity utilization, while reducing the risk of overheating and optimizing charging/discharging operations.
Implementation Method 1
a detection connection member connecting the first connection tab to the first battery cell
Implementation Method 2
a thermistor for temperature detection
Data Source
AI summary
A battery pack includes: a first battery cell; a circuit board electrically connected to the first battery cell and extending along a first axis, a first surface of the circuit board facing the first battery cell; a first connection tab protruding from the first surface of the circuit board toward the first battery cell along a second axis crossing the first axis; and a detection connection member connecting the first connection tab to the first battery cell.