Secondary Battery Charge Control Circuit for Pulse Charging Safety
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Solution Overview
Problem
Existing charge control methods for secondary batteries, particularly lithium-ion batteries, fail to ensure safety during pulse charging due to inadequate temperature detection and voltage control, leading to potential overheating and reduced efficiency, especially in abnormal battery states such as increased internal resistance or internal short circuits.
Innovation Solution
A charge control method and circuit that record and analyze charge data from previous cycles to determine if charging should be inhibited, using threshold values for charge time, temperature, state of charge, and voltage to prevent unsafe charging conditions, ensuring the battery is not subjected to prolonged constant current charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulse charging is used to charge the secondary battery within a short time, then charging speed is improved, but heat generation increases and safety deteriorates
Solution Approach 1:
The patent applies periodic action by implementing pulse charging with alternating charge and rest periods. The charging current is supplied in pulses rather than continuously, with the charge control circuit switching between charging mode and rest mode. This periodic action allows heat to dissipate during rest periods while maintaining fast charging capability, resolving the contradiction between charging speed and heat generation.
Solution Approach 2:
The patent applies preliminary action by detecting battery temperature and charge voltage before each charging pulse to determine whether to inhibit charging. The charge control circuit预先 checks temperature and voltage conditions, and only permits charging when conditions are safe. This preliminary detection prevents heat accumulation and ensures safety while maintaining efficient charging when conditions permit.
2Reliability
If charging is conducted at constant voltage control, then safety is improved, but charge-discharge efficiency decreases when internal resistance increases
Solution Approach 1:
The patent applies dynamics by transitioning from static constant voltage control to dynamic pulse charging with adjustable parameters. The charge control circuit dynamically adjusts charging current, voltage, and pulse width based on real-time battery state (temperature, voltage, charge level). This dynamic control maintains safety through continuous monitoring while optimizing charge-discharge efficiency by adapting to the battery's changing internal resistance characteristics.
Solution Approach 2:
The patent applies parameter changes by modifying charging voltage and current parameters based on battery state. Instead of fixed voltage control, the system changes voltage and current parameters dynamically during charging cycles. When temperature or voltage thresholds are exceeded, parameters are adjusted to inhibit charging; when conditions are favorable, parameters are optimized for efficient charging, thus resolving the contradiction between safety and efficiency.
3Productivity
If the battery is charged repeatedly without inhibition, then productivity is improved, but battery deterioration accelerates and reliability decreases
Solution Approach 1:
The patent applies feedback by continuously monitoring battery temperature, charge voltage, and charge level, then using this feedback to control charging inhibition. The charge control circuit receives feedback from temperature sensors and voltage detectors, processes this information, and adjusts charging accordingly. This feedback mechanism prevents excessive charging frequency that would cause deterioration while maintaining high productivity when battery conditions permit repeated charging.
4Device complexity
If temperature detection and voltage control are not conducted accurately, then device complexity is reduced, but heat generation increases and charge efficiency drops
Solution Approach 1:
The patent applies universality by designing a charge control circuit that performs multiple functions: temperature detection, voltage detection, charge level monitoring, and charging control all within a single integrated circuit. This multi-functional design achieves accurate temperature and voltage control without proportionally increasing device complexity, thereby maintaining high charge efficiency while avoiding excessive system complexity.
Data Source
AI summary
A secondary battery charge control method includes: a charge control step of executing charging by supplying a charge current to a secondary battery; a charge information acquisition step of acquiring information relating to the charging executed in the charge control step; a storage step of storing the information acquired in the charge information acquisition step as charge data; and a charge inhibition determination step of determining whether to inhibit the charging in the charge control step on the basis of the charge data of a previous cycle that have been stored in the storage step when charging in the charge control step is started again after charging in the charge control step has been completed.