Battery Quick Charging via Temperature-Adaptive Cut-Off Voltage
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Solution Overview
Problem
Conventional battery charging methods are slow due to prolonged constant-voltage stages, which can lead to reduced charging speed and potential battery damage from overvoltage, especially in devices with high power consumption.
Innovation Solution
A battery quick charging method that involves acquiring state parameters, such as temperature, to select a charging cut-off voltage higher than the rated voltage using a target parameter mapping relationship, allowing for prolonged constant-current charging while avoiding overvoltage through flexible adjustment of charging cut-off voltage based on temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant-voltage charging is used to ensure no overvoltage and full charging, then battery safety is improved, but charging speed deteriorates
Solution Approach 1:
The patent implements dynamic switching between constant-current and constant-voltage charging stages based on real-time battery state monitoring. The charging apparatus adjusts charging parameters dynamically by detecting battery voltage and current, transitioning from constant-current charging when voltage is below threshold to constant-voltage charging when voltage reaches the threshold, thereby optimizing both charging speed and safety adaptively
Solution Approach 2:
The patent changes charging parameters (voltage threshold, current) based on battery state. By setting a voltage threshold lower than the rated voltage and adjusting charging current during different stages, the system achieves faster charging while preventing overvoltage. The charging cut-off voltage is set higher than rated voltage during constant-current stage, then switched to constant-voltage stage when threshold is reached
2Reliability
If constant-voltage stage is prolonged to ensure full charging, then charging completeness is improved, but charging time increases
Solution Approach 1:
The patent performs preliminary constant-current charging to rapidly increase battery voltage to near-full levels before transitioning to constant-voltage charging. This preliminary high-speed charging phase reduces the overall time required for the slower constant-voltage stage to complete the charging process
Solution Approach 2:
The patent dynamically determines the transition point from constant-current to constant-voltage charging based on real-time voltage monitoring. When battery voltage reaches the predetermined threshold (lower than rated voltage), the system automatically switches charging modes, optimizing the duration of each stage to minimize total charging time while ensuring full charging
3Productivity
If higher charging voltage is applied to increase charging speed, then charging speed is improved, but risk of overvoltage damage increases
Solution Approach 1:
The patent changes voltage parameters based on battery state and charging stage. During constant-current charging, the charging cut-off voltage is set higher than rated voltage to enable faster charging. When battery voltage reaches a predetermined threshold (lower than rated voltage), the system switches to constant-voltage charging mode, maintaining voltage at or below rated voltage to prevent overvoltage damage
Solution Approach 2:
The patent implements continuous feedback monitoring of battery voltage and current during charging. The charging apparatus detects real-time battery state and automatically adjusts charging parameters accordingly, reducing charging current or voltage when thresholds are approached to prevent overvoltage damage while maximizing charging speed during safe operating conditions
Data Source
AI summary
Provided are a battery quick charging method, a charging apparatus, and a device to-be-charged. The battery quick charging method includes the following. State parameters of a battery of a device to-be-charged are acquired, where the state parameters of the battery include a present temperature of the battery. A charging cut-off voltage corresponding to the present temperature is selected from a target parameter mapping relationship, where the charging cut-off voltage is higher than a rated voltage of the battery. Constant-current charging is performed on the battery until a voltage of the battery reaches the charging cut-off voltage and then performing of the constant-current charging on the battery is stopped.