Composite Battery Thermal Isolation for Voltage-Stable Hybrid Cells
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Solution Overview
Problem
Existing composite batteries fail to maintain different operating temperatures and accommodate voltage variations caused by environmental temperature changes, particularly when combining high-power secondary batteries and fuel cell systems.
Innovation Solution
A composite battery system is designed with an all-solid-state secondary battery housed in a heat-insulating enclosure and a high-power lithium ion secondary battery outside, utilizing an operating voltage holding device to maintain voltage stability and control temperature, ensuring both batteries operate within predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a fuel cell system and a high-power secondary battery are combined to achieve a composite battery, then the battery capacity and energy density are improved, but the operating temperature control becomes problematic because the fuel cell system operates at high temperature while the secondary battery requires room temperature
Solution Approach 1:
The composite battery system is divided into two independent temperature zones: a high-temperature zone for the fuel cell system and a low-temperature zone for the secondary battery. This segmentation allows each component to operate at its optimal temperature without interfering with the other, resolving the temperature control contradiction while maintaining high battery capacity.
Solution Approach 2:
A thermal management system acts as an intermediary between the fuel cell system and the secondary battery. This intermediary controls heat transfer and temperature distribution, ensuring that the high-temperature operation of the fuel cell does not adversely affect the low-temperature operation of the secondary battery, thereby enabling both components to maintain their respective operating temperatures simultaneously.
2Use of energy by moving object
If a fuel cell system is used as a large-capacity secondary battery in a composite battery, then the energy density is improved, but the operating voltage varies significantly with environmental temperature changes
Solution Approach 1:
A control system with feedback mechanisms monitors the operating voltage of the fuel cell system and adjusts operating parameters in real-time to compensate for temperature-induced voltage variations. This feedback control maintains voltage stability within acceptable ranges, resolving the reliability issue while preserving the high energy density benefits of the fuel cell system.
Solution Approach 2:
The operating parameters of the fuel cell system, such as current density and fuel flow rate, are dynamically adjusted based on environmental temperature conditions. By changing these parameters in response to temperature variations, the system compensates for voltage instability and maintains reliable operation across different temperature environments while retaining high energy density.
3Quantity of substance
If different types of batteries with different properties are connected in parallel to achieve high energy density and high power density, then the battery capacity is improved, but the temperature management complexity increases
Solution Approach 1:
The thermal management system is segmented into separate control zones for the fuel cell system and the secondary battery, with independent temperature control mechanisms for each zone. This segmentation simplifies the overall temperature management by allowing each battery type to be controlled independently according to its specific thermal requirements, reducing the complexity that would arise from attempting to manage both types uniformly.
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 maintains different operating temperatures and accommodates voltage variations, enabling continuous operation and enhanced thermal efficiency, power self-sufficiency, and increased battery capacity.
Implementation Method 1
a housing (18) formed of a heat-insulating member such that an inside of the housing (18) is thermally isolated from an outside of the housing (18)
Implementation Method 2
in response to charging power being supplied from outside, a reduction reaction of iron occurs and oxygen is released from the all-solid-state secondary battery to outside and such that, in response to supply of the charging power being stopped and oxygen being supplied from outside, an oxidation reaction of iron occurs and power is supplied from the all-solid-state secondary battery to outside
Data Source
AI summary
A composite battery and a composite battery system including the composite battery are provided. A composite battery includes an all-solid-state secondary battery, a lithium ion secondary battery, an operating voltage holding device, and a housing. The all-solid-state secondary battery operates under a predetermined temperature condition. The lithium ion secondary battery is of a high-power type connected in parallel to the all-solid-state secondary battery. The operating voltage holding device is for holding the operating voltage of the all-solid-state secondary battery within a predetermined range. The housing is formed of a heat-insulating member such that the inside of the housing is thermally isolated from the outside of the housing. The all-solid-state secondary battery is disposed inside the housing, and the lithium ion secondary battery and the operating voltage holding device are disposed outside the housing.