Dual-Battery Power Isolation for EV Parasitic Drain Control
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Solution Overview
Problem
Batteries in vehicles experience parasitic drain when not in use, leading to charge depletion and potential loss of power to essential systems, and there is a need for a solution to manage power when the power source or recharging ceases to operate.
Innovation Solution
A battery power management apparatus that includes a primary vehicle battery, a main cutoff switch, and a vehicle auxiliary battery, allowing for the disconnection of power to non-essential systems when the vehicle is not in use while maintaining power to essential systems and enabling remote control of the battery management system to conserve and recharge batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the battery is disconnected when the vehicle is not in use, then battery charge is conserved, but power to essential systems is lost
Solution Approach 1:
The patent divides the battery system into two separate batteries: a primary battery that remains connected to provide continuous power to essential systems (anti-theft system, radio clock, electronic command computer), and a secondary battery that can be disconnected to conserve charge. This segmentation allows the system to simultaneously maintain power supply reliability for essential systems while enabling charge conservation through selective disconnection of the secondary battery.
2Reliability
If the battery remains connected to power essential systems, then system reliability is maintained, but parasitic drain depletes battery charge
Solution Approach 1:
The patent segments the battery system into primary and secondary batteries, where the primary battery remains connected to essential systems to maintain continuous power supply, while the secondary battery can be disconnected to eliminate parasitic drain. This segmentation enables the system to simultaneously achieve reliability for essential systems and energy conservation by isolating the drain source.
Solution Approach 2:
The patent extracts the parasitic drain problem by separating the secondary battery from the essential systems circuit. The secondary battery can be disconnected using a cutoff switch, effectively removing the source of parasitic drain while the primary battery continues to power essential systems, thus eliminating energy loss without compromising system reliability.
3Loss of energy
If a cutoff switch is used to disconnect the battery, then energy loss is reduced, but system complexity increases
Solution Approach 1:
The patent introduces a cutoff switch to extract and control the disconnection of the secondary battery from the circuit. This simple switching mechanism enables effective parasitic drain reduction by allowing complete disconnection of the secondary battery when not in use, while adding minimal complexity to the overall system. The cutoff switch provides a straightforward solution to energy loss without requiring complex management electronics.
Data Source
AI summary
An apparatus, including a first circuit which contains a first load which does not draw current from a first battery when not operating, and includes an electric motor of an electric vehicle or hybrid vehicle; a second circuit which contains a second load which draws current from a second battery when the first load is not operating or is non-operational; a first switch which is capable of disconnecting the first battery from the first circuit; a second switch which is capable of connecting the first battery to the first circuit; and at least one recharger which is capable of recharging the first battery and the second battery when the first load is operating. The apparatus is capable of providing electrical power to the second load when the at least one recharger ceases to operate or becomes non-operational. The first load is an eaxle.