Energy Storage System with DC/DC Converter for Battery Cycle Life
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Solution Overview
Problem
Existing energy storage systems for handheld devices and electric cars primarily focus on extending battery discharge life without considering the impact of secondary battery dynamic response on cycle life, leading to reduced battery performance over time.
Innovation Solution
An energy storage system comprising a secondary battery and a capacitor connected in parallel, with a DC/DC converter configuring the equivalent series resistor of the capacitor to be larger than the battery's internal resistor, effectively decoupling transient voltage and smoothing ripple current, thereby enhancing battery cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a capacitor with very low equivalent series resistor is disposed between battery and load, then transient current consumption and voltage drop are reduced, but battery cycle life is not considered and electricity quality is affected by secondary battery's dynamic response
Solution Approach 1:
The patent changes the resistance parameter of the capacitor from very low (conventional) to a specific range that is larger than the battery's internal resistance. This parameter change optimizes the balance between reducing transient current loss and maintaining battery cycle life, preventing the battery from experiencing excessive dynamic response stress while still effectively smoothing voltage drops.
Solution Approach 2:
The capacitor acts as an intermediary element between the battery and the load. By positioning the capacitor with optimized resistance characteristics in this intermediate position, it buffers the direct interaction between battery and load, filtering transient currents and protecting the battery from harsh dynamic responses while maintaining power supply stability.
2Duration of action of moving object
If capacitor equivalent series resistor is made very low to reduce voltage drop, then discharge-life time is extended, but dynamic response effect affects electricity quality and cycle life
Solution Approach 1:
The patent optimizes the capacitor's equivalent series resistor parameter to a specific range rather than minimizing it. This optimized parameter setting extends discharge life time by effectively smoothing voltage drops while simultaneously reducing the battery's dynamic response stress, thereby preserving cycle life and overall system reliability.
3Duration of action of moving object
If secondary battery is used to extend discharge-life time, then operational duration is improved, but cycle life is reduced due to dynamic response effects
Solution Approach 1:
The capacitor serves as a protective intermediary between the secondary battery and the load. It absorbs and smooths transient currents and voltage fluctuations, preventing these dynamic responses from directly affecting the battery. This allows the battery to maintain its discharge life time while experiencing reduced stress, thereby extending its cycle life.
Solution Approach 2:
By optimizing the capacitor's resistance parameter to be larger than the battery's internal resistance, the system achieves a balanced configuration that maximizes discharge life time while minimizing the negative impact on cycle life. This parameter optimization ensures the battery operates in a more stable electrical environment.
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 significantly increases the cycle life of secondary batteries by stabilizing output electricity and reducing the dynamic response effect, leading to a longer operational time and reduced capacity decline.
Implementation Method 1
a capacitor device, electrically connected to the first terminal and the second terminal in parallel, and the capacitor device has an equivalent series resistor
Implementation Method 2
a DC/DC converter, electrically connected between the first terminal and the capacitor device
Data Source
AI summary
An energy storage system has a battery device, a first terminal, a second terminal, a capacitor device and a DC/DC converter. The first and second terminals are respectively connected two electrodes of the battery device, and the two electrodes have opposite polarities. The capacitor device is electrically connected to the first and second terminals in parallel. The DC/DC converter is electrically connected between the first terminal and the capacitor device. The battery device composed of at least one secondary battery and the capacitor device composed of at least one capacitor are electrically connected to each other in parallel, and by combining with the DC/DC converter, configuring the relation between the equivalent series resistor of the capacitor device and the internal resistor of the battery device, and/or configuring the upper current limit of the rated current of range the DC/DC converter, the battery cycle life is increased.