Battery Module Switch Arrangement for Reverse Polarity Blocking
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Solution Overview
Problem
Rechargeable battery modules face damage from reverse polarity connections, and existing solutions like diodes can overheat and complicate manufacturing, especially in high-power applications.
Innovation Solution
A battery module design featuring a switch arrangement with a first switching device that can operate in both current passing and blocking states, capable of blocking voltages twice the maximum charge voltage, providing dual functionality for discharging and protection against reverse polarity connections without the need for additional protective components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is used for reverse polarity protection, then the battery module is protected from reverse polarity connection, but the diode may overheat in high power applications and the manufacturing becomes more complex
Solution Approach 1:
The patent combines the reverse polarity protection function with the existing switching device that controls battery discharge. The switching device is configured to block current in both reverse polarity conditions and normal discharge conditions, eliminating the need for a separate protection diode and reducing overall circuit complexity
Solution Approach 2:
The switching device is designed to perform multiple functions: it controls battery discharge during normal operation and simultaneously provides reverse polarity protection. This multi-functionality reduces the number of components needed and simplifies the overall circuit design
2Reliability
If a diode is used for reverse polarity protection, then the battery module is protected from reverse polarity connection, but the diode may suffer from overheating in high power applications
Solution Approach 1:
The protection function is merged into the switching device that already handles high current during battery discharge. Since the switching device is designed to handle the full discharge current, it can also handle reverse polarity currents without overheating, unlike a separate protection diode would
Solution Approach 2:
The switching device uses its own control mechanism to protect against reverse polarity connections. The controller detects reverse polarity conditions and automatically blocks the switching device, eliminating the need for separate protection components that would generate heat
Data Source
AI summary
The present disclosure relates to a battery module (300) comprising a first charging terminal (203) and a second charging terminal (204) for connecting the battery module to an external power source (250) or a load (350). The battery module includes a battery cell arrangement (210) which has a maximum charge voltage and has a first terminal (201) and a second terminal (202). The first terminal (201) is connected to the first charging terminal (203). The battery module includes also a switch arrangement including at least a first switching device (240) connected between the second terminal (202) of the battery cell arrangement and the second charging terminal (204). The first switching device is operable to switch to a current passing state for discharging the battery module. The battery module also includes a controller (220) configured to control operation of the switch arrangement. Upon detection of a reverse polarity connection of the external power source at the first and second charging terminals, the controller is configured to operate the first switching device to switch to a current blocking state. The first switching device has a blocking voltage equal or higher than at least twice the maximum charge voltage of the battery cell arrangement.