EV Charging Control for Auxiliary Loads Without Battery Cycling
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Solution Overview
Problem
Current electric vehicle systems cannot selectively use power from the grid for auxiliary loads while charging, which leads to battery aging due to continuous charging and discharging for these loads.
Innovation Solution
A control unit method that requests a charger to provide power to auxiliary loads and charge the battery to a desired State of Charge (SOC) level, automatically stopping charging when reached, allowing the charger to continue powering the loads with grid power instead of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery is used to power auxiliary loads during charging, then the auxiliary loads can operate continuously, but the battery lifetime is reduced due to continuous charging and discharging cycles
Solution Approach 1:
The patent segments the power supply path by introducing a switching mechanism that separates the battery charging function from the auxiliary load power supply function. The switch enables independent control of power flow to the battery versus power flow to auxiliary loads, allowing the battery to be charged without being discharged by auxiliary loads simultaneously.
Solution Approach 2:
The patent implements dynamic control of the power distribution system through a switch that can change states based on charging status. When charging is detected, the switch dynamically redirects power flow to supply auxiliary loads directly from the charger, preventing unnecessary battery discharge cycles while maintaining continuous auxiliary load operation.
2Duration of action of stationary object
If a switch is added to control power distribution between battery and auxiliary loads, then battery lifetime is protected, but the vehicle complexity and cost increase
Solution Approach 1:
The patent implements a self-service control mechanism where the control unit automatically detects charging status and autonomously controls the switch without requiring manual user input. The system monitors charging parameters and automatically activates the alternative power supply path when charging is detected, reducing complexity by eliminating manual control interfaces while protecting battery lifetime.
3Device complexity
If the battery is used to power auxiliary loads, then no additional power distribution control is needed, but the battery undergoes unnecessary charging and discharging cycles
Solution Approach 1:
The patent introduces a control unit as an intermediary that intelligently manages power distribution based on charging status. The control unit acts as a mediator between the charger, battery, and auxiliary loads, detecting charging conditions and automatically activating the switch to create an alternative power path that bypasses the battery for auxiliary load供电, thereby eliminating unnecessary energy cycling.
Data Source
AI summary
The invention relates to a method performed by a control unit (115) for handling charging in an at least partly electric vehicle (100). The control unit (115) transmits, to a charger (103), a request to provide power to at least one auxiliary load (108) and to charge a battery (101) with an amount of voltage. The amount of voltage corresponds to a desired SOC level. The charging of the battery (101) automatically stops when the desired SOC level is reached. The charger (103) continues to provide power to the at least one auxiliary load (108) when the desired SOC level is reached.