Battery Discharge Communication Using Charging Protocol Compatibility
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Solution Overview
Problem
Most battery management systems (BMS) do not support discharging protocols, preventing the discharge of batteries in scenarios like V2L or V2G.
Innovation Solution
A charging and discharging apparatus with a communication module that communicates with the BMS using a universal charging protocol and a conversion module to convert direct current to alternating current, enabling discharge even when the BMS does not support a specific discharging protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a BMS does not support a specific discharging protocol, then the battery cannot be discharged, but using a universal charging protocol enables communication and discharge functionality
Solution Approach 1:
The charging and discharging apparatus is designed to support multiple protocols (both charging protocols and discharging protocols) and can automatically adapt to the protocol supported by the BMS. This multi-functional capability allows the apparatus to communicate effectively with BMS regardless of whether they support discharging protocols or not, thereby resolving the contradiction between protocol compatibility and discharge functionality.
2Ease of operation
If the BMS lacks discharging protocol support, then battery discharge is prevented, but the communication module can still establish communication using charging protocols
Solution Approach 1:
The communication module acts as an intermediary that can translate or adapt communication between different protocols. When the BMS does not support discharging protocols, the communication module uses charging protocols to establish communication and then coordinates with the conversion module to enable power transmission, thus bridging the gap between communication capability and power transmission capability.
Solution Approach 2:
The apparatus is divided into distinct functional modules: a communication module for protocol handling and a conversion module for power transmission. This segmentation allows the communication module to independently establish communication using charging protocols while the conversion module handles the actual power transmission, enabling both communication and power transmission even when the BMS lacks discharging protocol support.
3Adaptability or versatility
If direct current from the battery needs to be transmitted to an alternating current side connecting structure, then a conversion module is required, but this adds device complexity
Solution Approach 1:
The conversion module is designed to handle both charging and discharging operations, converting power in both directions (AC to DC during charging, DC to AC during discharging). This multi-functional design consolidates what could be separate conversion devices into a single unit, reducing overall system complexity while maintaining the capability to transmit energy in multiple modes.
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 battery discharge by implementing communication and conversion to facilitate power transmission between the BMS and the charging and discharging apparatus, allowing discharge even when the BMS does not support a specific discharging protocol.
Implementation Method 1
the conversion module is configured to convert direct current provided by the battery into alternating current and transmit the alternating current to the alternating current side connecting structure
Data Source
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AI summary
The present application discloses a charging and discharging apparatus and a power transmission method thereof, and relates to the field of battery power. The charging and discharging apparatus includes: a communication module, where the communication module is communicatively connected to a BMS and is configured to, under a condition of being in a first energy transmission mode and the BMS not supporting a specific discharging protocol, perform first communication with the BMS based on a universal charging protocol; and a conversion module, where one side of the conversion module is connected to a battery, the other side of the conversion module is connected to an alternating current side connecting structure, and the conversion module is configured to convert direct current provided by the battery into alternating current and transmit the alternating current to the alternating current side connecting structure in a process of the first communication. The first energy transmission mode is a mode in which the battery transmits power to the alternating current side connecting structure of the apparatus. Through the embodiments of the present application, the battery can be discharged under a condition that the BMS does not support a discharging protocol.