Dynamic Battery Charging Voltage Control via Load Current and Temperature
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Solution Overview
Problem
Current battery charging technologies often lead to overcharging and over-discharging of storage batteries, reducing their cycle life due to the lack of consideration for voltage rise phenomena during charging and discharging processes.
Innovation Solution
A battery device and control method that includes a current sensing unit, temperature sensing unit, storage unit, and processing unit to dynamically adjust charging voltage based on load current and battery temperature, preventing overcharging by identifying threshold intervals and corresponding charging voltage values to perform constant voltage charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed rate voltage charging is applied after discharging, then charging simplicity is maintained, but voltage rise phenomenon causes overcharging and reduces battery cycle life
Solution Approach 1:
The patent applies dynamics by transitioning from fixed rate voltage charging to dynamic charging voltage adjustment. The charging voltage is dynamically regulated based on the depth of discharge (DOD) calculated from load current, battery temperature, and cycle number. This allows the charging voltage to adapt to the battery's actual state, preventing overcharging while extending cycle life.
Solution Approach 2:
The patent changes the charging voltage parameter based on DOD threshold intervals. By calculating DOD and comparing it against predefined thresholds, the system selects appropriate charging voltage values from a set of predetermined values. This parameter change strategy ensures the charging voltage matches the battery's discharge characteristics, avoiding voltage rise-induced overcharging.
2Productivity
If fast charging is implemented to meet consumer demand, then charging speed is improved, but overcharging risk increases and decreases cycle life
Solution Approach 1:
The patent implements feedback by continuously monitoring load current, battery temperature, and cycle number to calculate DOD. This feedback mechanism allows the system to adjust charging voltage in real-time based on the battery's actual state, preventing overcharging even during fast charging operations while maintaining high charging speed.
Solution Approach 2:
The patent applies preliminary action by pre-calculating DOD threshold intervals and corresponding charging voltage values before charging begins. The system stores multiple charging voltage values associated with different DOD ranges, allowing it to quickly select the appropriate voltage during charging without complex real-time calculations, thus maintaining fast charging speed while ensuring safety.
3Power
If heavy load discharge is allowed to meet power demands, then power delivery capability is improved, but over-discharge occurs and reduces battery capacity
Solution Approach 1:
The patent replaces mechanical current limiting with an intelligent control system that uses electrical measurements (current, temperature, cycle number) to calculate DOD and regulate charging voltage. This substitution allows the battery to deliver high power during heavy loads while the control system prevents over-discharge by adjusting charging parameters based on accumulated discharge data.
Data Source
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AI summary
A battery device includes a storage battery unit, a current sensing unit, a temperature sensing unit, a storage unit and a processing unit. The current sensing unit detects load current. The temperature sensing unit detects the battery temperature of the storage battery unit. The storage unit stores a cycle number, multiple threshold intervals, and multiple charging voltage values. According to the load current, the battery temperature and the cycle number, the depth of discharge of the storage battery is acquired. The storage unit stores the load current, the battery temperature and the cycle number. The processing unit operates a charging procedure. The charging voltage value corresponding to the working threshold interval is selected to be the main charging voltage value, and the DC voltage that is identical to the main charging voltage value is used to perform a constant voltage charge for the battery unit.