A battery charging method, battery full life cycle charging method and system

Abstract

A battery charging method, battery full life cycle charging method and system, belonging to the field of battery management. The battery charging method includes: if the charging current is controlled within a safe range, and the second charging time tc2 is not less than the first charging time tc1, charging the battery with tc1; if the charging voltage is controlled within a safe range, and tc1 is not less than At tc2, the cell is charged with tc2; tc1 is the longest time during which the cell is at the overcharge voltage but has not yet formed irreversible damage; tc2 is the cell is at the overcharge current during charging but has not yet formed irreversible damage longest time. The battery charging method includes: calculating the charging pulse at the next moment according to the real-time data of the battery, tc1, tc2, and the change information of the first and second relaxation times, so that the battery has the highest tolerable charging voltage or the highest charging voltage in a healthy state. current for the longest time until the battery is fully charged. The invention realizes low-cost and well-balanced fast charging under the condition of lowering the requirement for the consistency of the electric core itself.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a battery charging method, a battery full life cycle charging method and a system. Background technique [0002] Electrochemical energy storage has many advantages, such as short construction period and return on investment period, low environmental requirements, distributed construction, and suitable for distributed renewable energy storage. Therefore, it is one of the important energy storage technologies for the Energy Internet. How to develop a battery system with high safety, good economy, environmental protection and good reproducibility is the core problem of solving distributed energy storage. [0003] Charging technology is one of the keys to the healthy and safe use of battery systems. Unreasonable charging methods will greatly shorten battery life, and even cause potential safety hazards. The recent frequent spontaneous combustion of lithium battery electr...

AI Technical Summary

Problems solved by technology

Due to the consideration of power consumption and cost, the balance current of the traditional active battery management system is generally around 5A. Therefore, its balance ability is limited, and the requirements for battery cells in groups are high.

In addition, the balance method of the active battery management system is not closely related to the charging algorithm; and the active balance algorithm is controlled by the model and has a weak dependence on historical data

[0006] It can be seen that during the charging process, the weak cell balancing ability of the existing battery management system has greatly increased the battery system's requirements for cell consistency, which will greatly increase the cost on the one hand, and on the other hand, as the charging speed increases , the charging current becomes larger, and the balance between the cells becomes impossible, which leads to overcharging of some cells and accelerates the aging of the battery

Seriously, it will also cause thermal runaway of the battery and cause a safety accident

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