Control Module Shielding Part for Battery Current Sensor Noise
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Solution Overview
Problem
The increasing size of battery modules in high-output motor systems for hybrid and electric vehicles poses a challenge in maintaining a compact control module size while minimizing the impact of electromagnetic noise, particularly due to the proximity of current sensors and switches in the charge/discharge circuit unit.
Innovation Solution
A control module configuration with a bus bar for electrical connection, a switch for magnetic field generation, and a current sensor for detection, along with a shielding part positioned between the current sensor and switch, reduces the magnetic field interference and maintains detection accuracy despite a shorter distance between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery module size is increased to achieve high output performance, then the battery module can supply sufficient driving electric power, but the control module size tends to increase and the distance between the relay and current sensor becomes shorter
Solution Approach 1:
A shielding part made of magnetically shielding material is introduced as an intermediary component between the relay and current sensor. This shielding part blocks magnetic fields generated by the relay from reaching the current sensor, thereby preventing electromagnetic noise interference while allowing the components to be positioned closer together
2Volume of moving object
If the distance between the relay and current sensor is shortened to reduce control module size, then the control module remains compact, but the current sensor becomes more susceptible to electromagnetic noise
Solution Approach 1:
The shielding part serves as a magnetic field barrier that allows the relay and current sensor to be positioned in close proximity without compromising detection accuracy. The shielding material blocks magnetic flux paths, preventing the relay's magnetic field from interfering with the current sensor's measurements
3Volume of moving object
If the control module size is suppressed to maintain compactness, then the overall device remains small, but electromagnetic noise from the relay affects the current sensor more strongly
Solution Approach 1:
The shielding part is strategically positioned between the relay and current sensor to create a magnetic field barrier. This allows the control module to maintain a compact design while the shielding material ensures reliable current detection by blocking electromagnetic interference from reaching the sensor
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
This configuration effectively suppresses electromagnetic noise interference, ensuring accurate current detection and preventing a size increase in the control module, thereby maintaining performance and compactness.
Implementation Method 1
the current sensor is configured to detect current passing through the bus bar by converting, to an electrical signal, a magnetic field generated by the current passing though the bus bar
Implementation Method 2
the shielding part is arranged between the current sensor and the switch... a magnetic field caused at the switch is reduced or suppressed from passing the current sensor
Data Source
AI summary
A control module is arranged side by side with a battery module. The control module includes a bus bar by which the battery module and an electric load are electrically connected to each other; a switch by which an electrical connection between the bus bar and the electric load is switched on and off; a current sensor by which a current of the bus bar is detected; and a shielding part. The current sensor detects current passing through the bus par by converting, to an electrical signal, a magnetic field generated by the current passing though the bus bar. The switch generates a magnetic field to switch over connections between the bus bar and the electric load based on the generated magnetic field. The shielding part is arranged between the current sensor and the switch.