BMS Relay Protection Circuit With Single-Relay Current Threshold Control
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Solution Overview
Problem
The current battery management system (BMS) relay scheme is complex, increasing manufacturing cost, assembly time, and defective rates due to multiple relays requiring manual operations and increased labor and equipment costs, leading to potential errors and quality issues.
Innovation Solution
A simplified relay protection circuit using one relay with integrated components like a shunt resistor, current detection module, AFE chip, MCU control chip, MOS modules, and a relay control power supply, which detects current thresholds to control the relay's state, reducing the need for multiple relays and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple relays (pre-charging relay, pre-discharging relay, main charging relay, main discharging relay) are used in the BMS relay scheme, then the battery charging and discharging process can be effectively managed and protected, but the device complexity increases, manufacturing cost increases, and assembly defective rate increases
Solution Approach 1:
The patent combines multiple relay functions (pre-charging relay, pre-discharging relay, main charging relay, main discharging relay) into a single integrated relay device. This merging reduces the number of separate components from four to one, simplifying the overall system structure while maintaining the protective functions for battery charging and discharging processes
Solution Approach 2:
The integrated relay is designed to perform multiple functions that were previously distributed across four separate relays. It can control pre-charging, pre-discharging, main charging, and main discharging operations, as well as provide short-circuit protection, making a single component universal for multiple protective roles in the BMS system
2Reliability
If multiple relays are used in the BMS relay scheme, then comprehensive battery protection is achieved, but the manufacturing cost significantly increases due to relay costs, labor costs, additional equipment and tool investment
Solution Approach 1:
By merging four separate relays into one integrated relay, the patent reduces component procurement costs and eliminates the need for multiple relay mounting positions. This consolidation directly reduces material costs and assembly labor costs, making the manufacturing process more cost-effective while preserving comprehensive battery protection capabilities
3Reliability
If multiple relays are used in the BMS relay scheme, then battery charging and discharging control is achieved, but the assembly time increases due to more manual operations and debugging and testing time
Solution Approach 1:
The integration of multiple relay functions into a single relay reduces the number of manual mounting operations from four to one. This significantly reduces assembly time and eliminates the need for extensive debugging and testing that would be required for multiple separate relay components, thereby reducing time loss in the manufacturing process
4Reliability
If multiple relays are used in the BMS relay scheme, then battery charging and discharging protection is achieved, but the assembly defective rate increases due to more components and connections involved
Solution Approach 1:
By combining four separate relay components into one integrated relay, the patent reduces the number of connections and mounting points from four to one. This reduction in component count and connection points directly lowers the probability of assembly errors, improving manufacturing precision and reducing the assembly defective rate while maintaining over-charging and over-discharging protection
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
Reduces manufacturing costs, streamlines assembly, decreases defective rates, and ensures product stability and durability by replacing multiple relays with a single integrated solution.
Implementation Method 1
a current detection module, configured to detect a current of the shunt resistor to generate a current detection signal
Data Source
AI summary
The invention discloses a relay protection circuit for a BMS. The relay protection circuit for a BMS includes: a BMS battery, a shunt resistor, a current detection module, an AFE chip, an MCU control chip, a pre-discharging MOS module, a pre-charging MOS module, a relay and a relay control power supply. The current detection module is configured to detect a current of the shunt resistor to generate a current detection signal, and the current detection signal is transmitted to the AFE chip to determine whether the detected current exceeds a current threshold; and when the detected current exceeds the current threshold, the AFE chip sends a notification signal to the MCU control chip, and the MCU control chip controls an on/off state of the relay control power supply so as to control an on/off state of the relay.