Switchable Battery Pack Topology for 400 V and 800 V Charging
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Solution Overview
Problem
Existing vehicles with dual compatibility for 400 V and 800 V charging equipment face inefficiencies due to the use of voltage converters, which increase manufacturing costs and reduce charging efficiency.
Innovation Solution
A power storage system with a first and second battery connected in series or parallel configurations, a three-phase motor, inverter, DC power supply circuit, branch circuit, capacitor, pre-charge circuit, converter, and second battery, allowing efficient charging and operation at both voltage levels without additional converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage converter is used to enable charging at both 400 V and 800 V, then compatibility with both charging equipment types is improved, but charging efficiency deteriorates and manufacturing cost increases
Solution Approach 1:
The battery module connection system is made dynamically switchable between series and parallel configurations. The first switch unit changes the connection state of battery modules based on the charging equipment type, enabling the battery pack to adapt its voltage output dynamically - series connection for 800V charging equipment and parallel connection for 400V charging equipment, thereby eliminating the need for voltage converters and improving charging efficiency
Solution Approach 2:
The battery connection system is designed to perform multiple functions through a single switchable architecture. The same battery modules can serve both 400V and 800V charging standards by simply changing their connection configuration, making the charging system universal without requiring separate voltage conversion pathways for different voltage standards
2Adaptability or versatility
If a voltage converter is used to enable charging at both 400 V and 800 V, then compatibility with both charging equipment types is improved, but manufacturing cost increases
Solution Approach 1:
The battery connection system is designed to perform multiple functions through a single switchable architecture. The same battery modules can serve both 400V and 800V charging standards by simply changing their connection configuration, making the charging system universal without requiring separate voltage conversion pathways for different voltage standards
Solution Approach 2:
The patent merges the voltage adaptation function into the existing battery connection structure rather than adding separate voltage conversion systems. The switchable connection system combines series and parallel configuration capabilities within a single architectural framework, eliminating the need for additional voltage converters and reducing manufacturing costs
3Productivity
If battery modules are connected in series for 800 V charging, then charging speed is improved, but compatibility with 400 V charging equipment is lost
Solution Approach 1:
The battery module connection system is made dynamically switchable between series and parallel configurations. The first switch unit changes the connection state of battery modules based on the charging equipment type, enabling the battery pack to adapt its voltage output dynamically - series connection for 800V charging equipment and parallel connection for 400V charging equipment, thereby eliminating the need for voltage converters and improving charging efficiency
Data Source
AI summary
A power storage system includes a first battery including two power storages, and a switch unit which switches between two voltage states in series and in parallel, a three-phase motor having a neutral point, an inverter connected on a power transmission path between the first battery and the three-phase motor, a DC power supply circuit connected to a connection portion on a power transmission path between the inverter and the first battery, a branch circuit branched from the DC power supply circuit on a positive side thereof and connected to a coil of one phase in the three-phase motor, a capacitor, a pre-charge circuit connected to a power transmission path between the inverter and the first battery, a converter connected to the pre-charge circuit, and a second battery connected to the converter and having a voltage lower than voltages of the first battery in the two voltage states.