Battery Contact Sequence Control for Safe Power Connection
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Solution Overview
Problem
Conventional electrical devices with replaceable battery packs often restart unintentionally when a new battery pack is installed, leading to potential sparking and wear on contact elements due to premature power connection before data exchange is established.
Innovation Solution
A protection system that delays the communication connection relative to the power connection when a battery pack is installed, using a control device to suppress activation if the power connection is established before the communication connection, and includes mechanisms to ensure a time delay in establishing electrical connections, such as spatially offset or shorter contact elements, and mechanical or electrical release devices to block contact elements until the power connection is secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the main contacts of the battery pack make contact with the main contacts on the device first to establish power supply, then the power connection is established quickly, but the device may unintentionally restart if the main switch is already on
Solution Approach 1:
The contact elements are divided into two functional groups: first contact elements for power connection and second contact elements for communication connection. This segmentation allows the power connection to be established first while the communication connection follows, enabling the control unit to detect the installation state and prevent unintended restarts.
Solution Approach 2:
The first contact elements are positioned to make contact before the second contact elements during battery pack installation. This preliminary action establishes the power connection in advance, allowing the control unit to subsequently detect the communication connection status and suppress activation if needed.
2Productivity
If the power connection is established before the communication connection during battery installation, then the power supply is quickly restored, but sparking occurs on the contact elements
Solution Approach 1:
The contact elements are segmented into first contact elements (power) and second contact elements (communication). The spatial offset ensures that during insertion, the power contacts engage first while communication contacts engage later, preventing sparking by controlling the sequence of electrical connection.
Solution Approach 2:
The control unit acts as an intermediary that monitors the establishment of both power and communication connections. It uses the timing information from the contact element engagement sequence to determine whether to suppress device activation, thereby preventing harmful sparking effects.
3Reliability
If the contact elements are positioned to establish communication connection before power connection, then unintended restarts are prevented, but the power supply establishment is delayed
Solution Approach 1:
Instead of establishing communication connection first and then power connection, the patent inverts the sequence by establishing power connection first through the first contact elements, followed by communication connection through the second contact elements. This inversion allows quick power restoration while using the control unit to prevent unintended restarts.
4Reliability
If spatially offset contact elements are used to create time delay in connection establishment, then the correct connection sequence is achieved, but the device complexity increases
Solution Approach 1:
The contact device is segmented into first contact elements and second contact elements with different spatial positions. This segmentation creates the required time delay in connection establishment through simple geometric arrangement rather than complex control mechanisms, achieving reliable sequence control with minimal added complexity.
Data Source
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AI summary
The invention relates to a protection system (102) for an electrical appliance (100) powered by an installable battery pack (200). The protection system comprises a control device (150), wherein the control device (150) is designed to activate the electrical appliance (100), when the battery pack (200) is installed, by actuation of a main switch (140), and wherein a contact device (101) of the electrical appliance (100) and a contact device (201) of the battery pack (200) comprise contact elements (111, 112, 121, 122, 123, 211, 212, 221, 222, 223) that complement each other, each of which forms a first and a second interface (110, 120, 210, 220) to establish a first and a second electrical connection (301, 302) between the electrical appliance (100) and the battery pack (200). The contact devices (101, 102) are designed, on installation of the battery pack (200), to establish the first electrical connection (301) before the second electrical connection (302). Furthermore, the control device (150) is designed to suppress the activation of the electrical appliance (100) if the first electrical connection (101) is established before the second electrical connection (102) provided the main switch (140) is actuated.