Battery Pack Power Blocking Device for Main Switch Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In battery packs, a short-circuit current can cause the main switch to fuse and potentially ignite due to delayed control signals and defects in the main fuse, leading to permanent bonding and increased risk of ignition.
Innovation Solution
A battery pack design incorporating a power blocking device with an auxiliary switch and fuse that immediately blocks driving power to the main switch when a short-circuit current is detected, preventing the main switch from fusing by short-circuiting the coil ends and blowing the auxiliary fuse before the main switch can fuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main switch is used to electrically connect the battery module and load, then the battery pack can be controlled to connect or disconnect the load, but when a short-circuit current flows through the main switch, the main switch may be fused and cause ignition due to delayed control signals
Solution Approach 1:
The power blocking device is configured to block the driving power supply to the main switch before the main switch can be fused by short-circuit current. This preliminary action prevents the harmful effect of ignition by removing power supply in advance when abnormal current is detected, rather than waiting for the main switch control signal to respond
Solution Approach 2:
The power blocking device serves as an intermediary component between the driving power supply and the main switch. It monitors the current flowing through the main switch and interrupts the power supply path when abnormal conditions are detected, thereby protecting the main switch from fusing and preventing ignition without requiring the main switch control signal to respond
2Reliability
If the main fuse is provided in the current path to protect against short-circuit current, then overcurrent protection is provided, but defects in the main fuse can cause delayed response and allow short-circuit current to continuously flow
Solution Approach 1:
The power blocking device performs preliminary protection by blocking the driving power supply before the main fuse can respond to short-circuit current. This eliminates the time delay associated with main fuse operation, as the power blocking device directly interrupts the power supply path when abnormal current is detected
Solution Approach 2:
The protection function is segmented into two independent parts: the main fuse that protects against overcurrent in the load path, and the power blocking device that protects against short-circuit current by blocking the driving power supply. This segmentation allows each component to perform its specific protection function without interfering with the other, eliminating the response delay problem
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 design effectively prevents the main switch from fusing and reduces the risk of ignition by quickly disconnecting the main switch from the driving power supply, ensuring safe disconnection even with delayed control signals or fuse defects.
Implementation Method 1
a third contact terminal that electrically configured to connect the first and second contact terminals when a current flows through the first coil
Implementation Method 2
a second coil that is coupled to a power line connecting one end of the battery module and the first contact terminal, and is configured to generate an electromotive force when an amount of a current flowing through the power line is changed
Data Source
AI summary
A battery pack includes a main switch configured to electrically connect a battery module and a load, a power supply configured to supply driving power to the main switch, and a power blocking device configured to block the driving power based on a current flowing between the battery module and the load.