Battery Pack Charging Discharging Control Circuit Protection
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Solution Overview
Problem
Existing battery charging/discharging control circuits struggle to effectively protect against excess-current states during both charging and discharging operations, especially when current values differ significantly, leading to increased complexity and size in the battery pack's terminal structure and internal mechanisms.
Innovation Solution
A charging/discharging control device with first and second switches connected in parallel, a switching control unit, and separate protective elements for charging and discharging current paths, which switch between charging and discharging operations and fuse respective current paths when current values exceed specific fusing values, preventing excess-current states without increasing device scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate protective elements are arranged for charging and discharging current paths, then protection from excess-current states in both charging and discharging operations is achieved, but the terminal structure and internal structure become complex and the battery pack size increases
Solution Approach 1:
A single protective element is designed to perform multiple functions by detecting both charging and discharging current states and providing protection for both operations. The protective element universally monitors current flow regardless of direction and triggers protection mechanisms for both charging and discharging excess-current states, eliminating the need for separate protective elements for each operation.
Solution Approach 2:
The patent combines the protective functions for charging and discharging operations into a single integrated protective element. Instead of having separate protective elements for charging current path and discharging current path, the invention merges these functions into one element that handles both protection tasks, thereby reducing terminal structure complexity and battery pack size while maintaining comprehensive 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
The solution effectively protects battery cells from both excess-current states during charging and discharging while preventing device complexity and size increases, ensuring rapid protection and efficient operation by using distinct fusing current values for each operation.
Implementation Method 1
a first protective element that fuses the charging current path when a current value of the charging current path flowing through the first switch exceeds a first fusing current value; and a second protective element that fuses the discharging current path when a current value of the discharging current path flowing through the second switch exceeds a second fusing current value
Data Source
AI summary
A charging/discharging control device that can protect a chargeable/dischargeable battery cell from an excess current state while preventing the device from being increased in scale and from being complex. The charging/discharging control device includes: switches that are connected in parallel on current paths between a battery and a positive terminal of a battery pack; a switching control unit that switches between a charging current path and a discharging current path; a protective element that fuses the charging current path when a current value of the charging current path flowing through the switch exceeds a first fusing current value; and a protective element that fuses the discharging current path when a current value of the discharging current path flowing through the switch exceeds a second fusing current value higher than the first fusing current value.