Battery Discharge Sequencing With Reverse Potential to Reach 0 V
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Solution Overview
Problem
Existing battery discharge methods are inefficient and costly, particularly for recycling, as they require immersion in salt water and can lead to increased discharge time and risk of short circuits due to incomplete discharge to 0 V.
Innovation Solution
A battery discharge apparatus comprising a main control unit, a first discharge unit, and a second discharge unit, along with a short-circuit switch, which discharges batteries from a start voltage to a completion voltage and then to a reverse potential voltage, ensuring complete discharge and stability by short-circuiting when the voltage reaches 0 V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery is discharged to a discharge termination voltage using conventional methods, then the discharge process is simple, but the battery voltage increases again after discharge and short circuiting is required, increasing safety risks and operational complexity
Solution Approach 1:
The patent applies reverse polarity discharge by inverting the discharge direction. After discharging to the termination voltage, the system switches to discharge in the opposite direction (reverse polarity) to reach a reverse potential voltage. This inversion principle allows the battery to be fully discharged to 0V without requiring additional short circuiting operations, as the reverse discharge naturally completes the voltage reduction to zero.
Solution Approach 2:
The system performs preliminary discharge to the termination voltage using the first discharge unit before switching to the second discharge unit for reverse polarity discharge. This preliminary action ensures that the battery is partially discharged in the normal direction first, then completes the discharge process in reverse, achieving complete discharge to 0V and eliminating the need for post-discharge short circuiting.
2Reliability
If salt water immersion discharge is used for battery recycling, then discharge can be achieved, but workability deteriorates and discharge time and costs increase
Solution Approach 1:
The patent replaces the mechanical/chemical salt water immersion discharge method with an electrical discharge system using controlled current flow. Instead of using salt water as a discharge medium, the system uses electronic discharge units that can precisely control the discharge process, achieving complete discharge to 0V while maintaining high efficiency and reducing operational complexity.
Solution Approach 2:
The system changes the discharge parameters by switching between two discharge units with different discharge characteristics. The first discharge unit operates with normal polarity parameters to discharge to termination voltage, then the second discharge unit operates with reverse polarity parameters to discharge to reverse potential voltage, achieving complete discharge without the inefficiencies of salt water immersion.
3Loss of time
If the battery is discharged only to discharge termination voltage, then discharge time is shorter, but incomplete discharge to 0 V causes safety risks due to voltage increase after discharge apparatus removal
Solution Approach 1:
The patent ensures continuous discharge action by operating two discharge units in sequence without interruption. The first discharge unit discharges to termination voltage, then immediately the second discharge unit continues the discharge in reverse polarity to reach reverse potential voltage, ensuring the battery voltage reaches 0V continuously without stopping, thereby eliminating safety risks while maintaining efficient discharge time.
Data Source
AI summary
Provided is a battery discharge apparatus, which includes a main control unit; a first discharge unit configured to discharge a battery from a discharge start voltage to a discharge completion voltage under control of the main control unit; a second discharge unit configured to discharge the battery from the discharge completion voltage to a reverse potential voltage under the control of the main control unit; and a short-circuit switch configured to short-circuit the battery under the control of the main control unit when a voltage of the battery is increased from the reverse potential voltage to become 0 V.