Battery Storage System for Fast EV Charging with Low Grid Load
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Solution Overview
Problem
The existing charging infrastructure for cyclically rechargeable traction batteries in electric and hybrid vehicles faces challenges in providing fast and efficient charging, especially in locations with low grid connection capacity, leading to high additional loads on the power grid and increased costs for infrastructure development.
Innovation Solution
A method utilizing a battery storage system comprising multiple starter batteries grouped together to provide high discharge currents for short periods, allowing for efficient charging of traction batteries through sequential activation of battery groups, which can be inducted or connected via a plug, and a charging station network that manages energy distribution and types of electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high charging current is supplied directly from the power grid to charge the traction battery quickly, then the charging speed is improved, but the load on the power grid infrastructure increases significantly
Solution Approach 1:
The battery storage system is divided into multiple battery groups (first battery group, second battery group, etc.), each capable of independent operation. This segmentation allows the system to distribute the charging load over time by sequentially activating different groups, reducing the peak power demand on the grid while maintaining fast charging capability.
Solution Approach 2:
Battery groups are pre-charged during periods of lower demand and then sequentially discharged to provide high charging currents when needed. This preliminary charging action allows the system to store energy in advance and deliver it during peak charging requirements without imposing continuous high load on the grid.
2Quantity of substance
If multiple battery groups are charged simultaneously from the power grid, then the battery storage capacity is improved, but the power grid load increases
Solution Approach 1:
The system employs periodic charging and discharging cycles for different battery groups. Instead of charging all groups simultaneously, the controller activates battery groups in sequence - charging one group while another discharges to provide load current. This periodic operation builds up storage capacity over time while maintaining manageable grid load at any given moment.
Solution Approach 2:
While one battery group is being charged from the grid, another group simultaneously discharges to supply current to the traction battery. This continuous useful action ensures that the charging function is maintained without interruption, while the grid only needs to supply power at a moderate rate to individual groups rather than the sum of all groups simultaneously.
3Device complexity
If starter batteries are used in the battery storage system, then the device complexity and cost are reduced, but the batteries can only discharge for short periods
Solution Approach 1:
Multiple starter batteries are combined into battery groups that collectively provide the required energy capacity. While individual starter batteries have limited discharge duration, the combination of several groups operating sequentially extends the overall available discharge time. This merging approach maintains the simplicity and cost-effectiveness of using standard starter batteries while achieving the functional requirements.
Solution Approach 2:
The system dynamically switches between different battery groups based on their charge state and the current charging demand. When one group is depleted, the controller transitions to the next charged group, creating a dynamic operation pattern that extends the effective discharge duration beyond what any single starter battery could provide, while maintaining system simplicity.
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
Enables quick and efficient charging of traction batteries even in locations with low mains connection power, reducing the additional load on the power grid and allowing for widespread deployment of rapid charging stations with minimal infrastructure expansion, while also utilizing old batteries for power supply.
Implementation Method 1
a battery storage system (8), in particular having a large number of cyclically rechargeable batteries (B1 to Bx), in particular to provide high electrical power
Implementation Method 2
the electrical energy can also be transmitted inductively
Data Source
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AI summary
The invention relates to a method and a charging station for charging a cyclically rechargeable traction battery (5) of at least partially electrically powered vehicles (4), in particular electric and/or hybrid cars. According to the invention, a charging station (10) comprises a battery storage system (8) and a charging device (7). The charging device (7) has an energy transfer device (11) by means of which electrical energy is transferred to a traction battery (5) to be charged. The battery storage system comprises a plurality of cyclically rechargeable batteries (B1 to Bx) which are grouped into several battery groups (BG11 to BGn4), wherein the batteries (B1 to Bx) are starter batteries, in particular automotive starter batteries and/or lead-acid starter batteries.The battery groups (BG11 to BGn4) supply a traction battery (5) connected to the charging device (7) with a high battery group discharge current during short battery group discharge periods (t1 to t30) in immediate succession, whereby immediately successive short battery group discharge periods (t1 to t30) result in the high battery group discharge current and thus a high charging current (1) for the traction battery (5) to be charged over a longer charging period (T1).