Stacked Battery Pack Layout for Accurate Impedance Measurement
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Solution Overview
Problem
In assembled batteries, the magnetic field generated by one power storage device interferes with other devices, making it difficult to accurately measure internal impedances such as electrode or electrolyte impedance.
Innovation Solution
The battery pack design includes an assembled battery with power storage devices stacked such that electrode plates on the outermost surfaces of adjacent devices have the same polarity, minimizing magnetic flux interference. This configuration allows for accurate measurement of internal impedances using current application lines and voltage detection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power storage devices are arranged in an assembled battery, then the battery capacity and output voltage are increased, but magnetic field interference between adjacent devices makes it difficult to accurately measure internal impedances
Solution Approach 1:
A magnetic shielding member (intermediary element) is introduced between adjacent power storage devices to block magnetic field interference. This shielding member acts as a mediator that allows the battery pack to maintain high capacity through multiple stacked devices while preventing magnetic flux from interfering with impedance measurements of neighboring devices, thereby resolving the contradiction between quantity and measurement precision.
2Duration of action of moving object
If multiple power storage devices are stacked to increase battery capacity, then the use time is extended, but the magnetic flux generated by each device interferes with adjacent devices
Solution Approach 1:
The magnetic shielding member converts the harmful magnetic field interference into a contained magnetic flux pattern. By introducing the shielding member with specific magnetic permeability, the magnetic flux that would otherwise interfere with adjacent devices is redirected and contained, allowing multiple devices to be stacked for extended use time without suffering from magnetic interference effects.
3Device complexity
If voltage detection lines are placed in the external space of electrode terminals, then the device complexity is reduced, but electromagnetic induction disturbance generates induced electromotive force that affects measurement accuracy
Solution Approach 1:
The magnetic shielding member serves as an intermediary that blocks electromagnetic induction disturbance from reaching the voltage detection lines. Even though the detection lines are placed in external space for simplicity, the shielding member prevents induced electromotive force from affecting the measurements, thereby maintaining measurement precision without increasing device complexity.
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 enables precise measurement of internal impedances in power storage devices within an assembled battery, reducing the impact of magnetic interference and improving the accuracy of battery state monitoring.
Implementation Method 1
a current application line for applying current to the assembled battery; voltage detection lines for detecting voltages of the plurality of power storage devices; and a battery monitoring device that measures internal impedances of the plurality of power storage devices via the current application line and the voltage detection lines
Implementation Method 2
Each of the plurality of power storage devices includes an electrode assembly in which a positive electrode plate and a negative electrode plate are alternately stacked... Each of the plurality of power storage devices is stacked
Implementation Method 3
a problem is that the signal is likely to receive an external influence. One example of such a problem is electromagnetic induction disturbance that induced electromotive force is generated in an electrical circuit path
Data Source
AI summary
A battery pack includes: an assembled battery in which power storage devices are connected; a current application line for applying current to the assembled battery; voltage detection lines for detecting voltages of the power storage devices; and a battery monitoring device that measures internal impedances of the power storage devices via the current application line and the voltage detection lines. Each of the power storage devices includes an electrode assembly in which a positive electrode plate and a negative electrode plate are alternately stacked, and an electrode plate on one principal surface of the electrode assembly and an electrode plate on the other principal surface of the electrode assembly have the same polarity, the direction of current that flows through the positive electrode plate is an opposite direction of the direction of current that flows through the negative electrode plate, and each of the power storage devices is stacked.