Battery Module AC Heating to Suppress Terminal Voltage Fluctuation
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Solution Overview
Problem
Conventional power storage systems face challenges in efficiently increasing the temperature of power storage devices while minimizing voltage fluctuations and suppressing current flow through capacitors connected in parallel.
Innovation Solution
A power storage system is designed with multiple modules and AC application units that apply alternating currents with phases offset to attenuate voltage fluctuations at the ends of the power storage device, thereby promoting heat generation and temperature increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an AC voltage is applied to both ends of the power storage device to increase temperature through heat generation, then the temperature of the power storage device increases, but the current flowing through the power storage device is suppressed due to the capacitor's smaller impedance
Solution Approach 1:
The power storage device is divided into multiple modules, and AC voltage is applied to each module separately rather than to the entire device. This segmentation allows the AC current to flow through each module's internal resistance to generate heat while the capacitor connected in parallel to the entire device does not provide a low-impedance path for the AC current, thus solving the contradiction between temperature increase and current suppression
Solution Approach 2:
The AC voltage is applied locally to each module of the power storage device rather than uniformly to the entire device. This local application of AC voltage creates localized heat generation in each module through its internal resistance, while the overall system benefits from reduced voltage fluctuation and minimized capacitor current interference
2Stability of the object's composition
If a capacitor is connected in parallel to the power storage device, then voltage fluctuation is reduced, but the amount of current flowing through the power storage device is suppressed
Solution Approach 1:
By segmenting the power storage device into multiple modules and applying AC voltage to each module separately, the invention allows the capacitor to remain connected in parallel to the entire device for voltage stabilization without creating a low-impedance path that would suppress the current needed for heat generation in the individual modules
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
The system effectively suppresses voltage fluctuations and promotes heat generation, leading to appropriate temperature increases in the power storage device while minimizing the increase in withstand voltage and cost of the AC application units.
Implementation Method 1
there is known a device applying an AC voltage to both ends of a power storage device and increasing a temperature of the power storage device by heat generation at an internal resistance through which an alternating current flows
Data Source
AI summary
A power storage system capable of appropriately increasing a temperature of a power storage device is provided. A power storage system (10) includes a battery (31) and a plurality of AC application units (33). The battery (31) includes a string (31b) which is formed by a plurality of cells (31a) connected in series to each other. The battery (31) includes a plurality of modules (35) which are formed by dividing the string (31b) into a plurality of substrings in series. The plurality of AC application units (33) respectively apply alternating currents I having phases set to attenuate a voltage fluctuation at both ends (the positive electrode terminal (BP) and the negative electrode terminal (BN)) of the battery (31) to each of the plurality of modules (35).