Preheating charging control method for lithium ion battery

A charging control method and lithium-ion battery technology, which can be applied to battery/fuel cell control devices, control devices, electric vehicles, etc., and can solve problems such as obstacles to the application of fast charging in batteries

Inactive Publication Date: 2021-12-21
北京链宇科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the internal potential and temperature of the battery cannot be accurately controlled, it will bring a major obstacle to the application of fast charging in the battery

Method used

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  • Preheating charging control method for lithium ion battery
  • Preheating charging control method for lithium ion battery
  • Preheating charging control method for lithium ion battery

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Embodiment Construction

[0062] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0063] A kind of preheating charge control method of lithium-ion battery, such as figure 1 shown, including the following steps:

[0064] S1. Establish an equivalent model for thermoelectric coupling of battery temperature and negative electrode potential estimation, and set the negative electrode potential safety threshold, temperature safety threshold, target charging capacity and cut-off charging voltage;

[0065] In st...

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Abstract

The invention discloses a preheating charging control method for a lithium ion battery. The method comprises the steps of: firstly, establishing a thermoelectric coupling temperature and cathode potential estimation model; secondly, heating the battery to a preset charging initial temperature before charging according to the initial electric quantity and the temperature state of the battery; then charging the battery with a preset charging current again, in the charging process, estimating the current cathode potential and temperature of the battery in real time by utilizing the temperature of the battery and the cathode potential estimation model; and finally adjusting the charging current in real time by utilizing an optimization algorithm. According to the scheme, by establishing the thermoelectric coupling temperature and cathode potential estimation model, the anode characteristics and the cathode characteristics of the battery are separated, and the change rules of the cathode potential, the total battery voltage and the surface temperature in the charging process of the battery are accurately simulated. And the closed-loop estimation algorithm and the control optimization algorithm are used for adjusting the charging current in real time, so that the charging capacity of the battery is maximized in a safe charging interval, and safe and quick charging of the battery is realized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery management and charging, in particular to a method for controlling preheating and charging of a lithium-ion battery. Background technique [0002] As an important part of new energy power systems and electrochemical energy storage systems, lithium-ion batteries play a key role in the promotion of new energy vehicles and the development of renewable energy. With the continuous advancement of vehicle power battery technology, the battery life and service life of lithium-ion battery systems in pure electric vehicles have gradually been resolved. However, fast charging technology has not made breakthrough progress: In terms of charging speed, it only takes a few minutes for traditional fuel vehicles to fill up the fuel tank. At this stage, it takes at least dozens of minutes to replenish 80% of the electricity, and users still worry about charging. Existence; In terms of battery materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/27B60L58/13
CPCB60L58/27B60L58/13B60L2240/545B60L2240/547B60L2240/549Y02T10/70
Inventor 曹晟阁
Owner 北京链宇科技有限责任公司
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