Hybrid Switch Module for Battery Charge Discharge Circuits
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Solution Overview
Problem
The low switching speed and high failure rate of relays in charge and discharge circuits for battery modules and packs reduce the charging and discharging capacity, impacting their performance in new energy applications.
Innovation Solution
A charge and discharge circuit design that incorporates a combination of semiconductor switches and relays in switch modules, forming charging and discharging loops to reduce relay usage and improve circuit efficiency, with semiconductor switches offering higher switching speed and lower failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If relays are used to control charging and discharging, then the circuit structure is simple, but the switching speed is low and failure rate is high
Solution Approach 1:
The switch module is divided into multiple switches working in parallel, where at least one switch is a semiconductor switch and others are relays. This segmentation allows the system to combine the simplicity of relay-based structures with the high reliability of semiconductor switches, resolving the contradiction between circuit simplicity and switching reliability.
Solution Approach 2:
The patent changes the parameter of switch type from purely relay-based to a hybrid configuration including semiconductor switches. This parameter change improves switching speed and reliability while maintaining circuit functionality, directly addressing the contradiction between simple circuit structure and high switching reliability.
2Ease of manufacture
If relays are used for switching, then the circuit is easy to manufacture, but the charging and discharging capacity is reduced
Solution Approach 1:
By segmenting the switch module into multiple parallel switches with different types (semiconductor and relay), the system maintains ease of manufacture through modular design while improving charging and discharging capacity through the high-speed semiconductor switches.
Solution Approach 2:
The switch module uses a composite approach by combining different switch types (semiconductor switches and relays) in parallel. This composite configuration leverages the manufacturing simplicity of relays while incorporating the high-performance characteristics of semiconductor switches to enhance overall charging and discharging capacity.
3Duration of action of stationary object
If more relays are used to ensure circuit functionality, then the circuit is more reliable in terms of durability, but the switching speed decreases
Solution Approach 1:
The switch module segments the switching function across multiple parallel switches, allowing semiconductor switches to handle high-speed operations while relays provide durable, long-lasting operation. This segmentation resolves the contradiction between durability and switching speed by assigning different operational roles to different switch types.
Solution Approach 2:
The control unit acts as an intermediary that intelligently selects which switch type to activate based on operational requirements. For high-speed charging/discharging, semiconductor switches are activated; for durable, long-duration operations, relays are used. This intermediary control resolves the speed-durability contradiction.
Data Source
AI summary
A charge and discharge circuit includes: a charging loop, including a battery pack, a first switch module and a charging device connected in series, where, the charging loop is configured to charge the battery pack using the charging device, and precharge the charging device; and a discharging loop, including the battery pack, a second switch module and an electric device connected in series, where, the discharging loop is configured to make the battery pack discharge to the electric device, and precharge the electric device; where, the first switch module and the second switch module each include at least one switch, and a part of switches in the first switch module and the second switch module are semiconductor switches, and the other part of the switches in the first switch module and the second switch module are relays.