Active Equalizing Charging Device for Battery Modules
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Solution Overview
Problem
Existing secondary battery charging devices lack effective methods for equalizing the charge across multiple battery modules, leading to potential overcharging and reduced battery lifespan, as they rely on dissipative or suspend charging methods that are not efficient in maintaining balanced voltage across all cells.
Innovation Solution
An active equalizing charging device with a control unit, voltage detection unit, temperature detection unit, and multiple charging units that dynamically adjust charging based on detected voltage and temperature, ensuring each battery module is charged to a balanced state while preventing overcharging and excessive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dissipative equalizing circuit is used to consume power for equalized charging, then equalized charging of battery cells is achieved, but energy is wasted and charging efficiency is reduced
Solution Approach 1:
The patent implements dynamic charging control by switching between different charging modes (constant current, constant voltage, equalization charging) based on real-time battery state detection. The control unit dynamically adjusts charging parameters to achieve equalized charging without continuous energy dissipation, resolving the contradiction between reliable equalized charging and energy loss.
Solution Approach 2:
The patent changes charging parameters (current, voltage, time) based on battery state to achieve equalized charging. By detecting battery voltage and temperature, the system adjusts charging parameters dynamically, eliminating the need for dissipative circuits while maintaining charging equality, thus reducing energy loss.
2Reliability
If suspend charging method is used to achieve equalized charging, then overcharging is prevented, but charging time is extended and productivity is reduced
Solution Approach 1:
The patent employs feedback control by continuously detecting battery voltage and temperature, then adjusting charging current accordingly. The control unit receives real-time battery state information and dynamically modifies charging parameters to prevent overcharging while maintaining optimal charging speed, resolving the contradiction between safety and productivity.
Solution Approach 2:
The system dynamically transitions between charging stages (constant current, constant voltage, equalization) based on real-time battery state. This dynamic control prevents overcharging without requiring suspension of charging, thereby maintaining high charging productivity while ensuring battery safety.
3Reliability
If multiple independent charging circuits are used for each battery module, then equalized charging is achieved, but device complexity increases
Solution Approach 1:
The patent uses a single control unit that performs multiple functions: voltage detection, temperature monitoring, charging control, and equalization management. This multi-functional design achieves equalized charging for multiple battery modules without requiring independent charging circuits for each module, thereby reducing device complexity while maintaining reliability.
Solution Approach 2:
The patent combines detection and control functions into an integrated control unit that manages all battery modules through a unified charging circuit. By merging multiple functions into one control system, the patent achieves equalized charging across modules without the complexity of multiple independent charging circuits.
Data Source
AI summary
The present invention provides an active equalizing charging device and a method using the charging device to charge a secondary battery. The secondary battery consists of a storage battery unit, which includes a plurality of battery modules connected in series. The active equalizing charging device consists of a control unit, a charging unit, a voltage detection unit, and a temperature detection unit. The control unit is coupled to and used to control the charging unit. The voltage detection unit is used to detect the voltage of each of the battery modules. The temperature detection unit is used to detect the temperature of the storage battery unit. The charging unit consists of one first battery charger, one first switch, a plurality of second battery chargers, and a plurality of second switches. The first switch is used to close or open the circuit between the first battery charger and the storage battery unit. Each of the second battery chargers is respectively coupled to one of the battery modules and the power source, and each of the battery modules is respectively coupled to one of the second battery chargers. Each of the second switches are used to close or open the circuit between each of the second battery chargers and the battery modules.