Apparatus used for lithium battery charging and control method thereof

A control method and technology for lithium batteries, applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve the problems of device consumption, energy consumption, long time, etc., and achieve controllable volume, large current, fast effect

Inactive Publication Date: 2016-10-26
安徽安耐捷新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the dissipative equalization scheme, the heat dissipation resistor wastes power and generates a lot of heat at the same time, causing thermal management problems, and the equalization current is too small compared to the charging current
[0005] Non-dissipative equalization often uses inductance and capacitance to transfer energy from high-voltage monomers to low-voltage monomers. The time required for equalization is very long, which does not meet the rapidity requirements of battery charging; and frequent switching It will also consume a lot of energy, and a part of the electric energy will definitely be consumed due to the loss of the device during the transfer process.
Coaxial coil transformer equalization circuit, because the length and shape of the wires between the winding and each single battery are different, the transformation ratio is different, resulting in inconsistent balance of each single battery
The coaxial coil itself consumes a certain amount of energy due to electromagnetic leakage and other problems; at the same time, the volume of the transformer also limits its application in many compact occasions
These problems make the above non-dissipative equalization scheme difficult to be practical

Method used

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  • Apparatus used for lithium battery charging and control method thereof

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Embodiment Construction

[0024] The device used for lithium battery charging includes a charging system and a battery pack used in conjunction with it.

[0025] Lithium batteries usually consist of multiple battery cells to form a battery unit, and then multiple battery cells are connected to each other and packaged between the upper cover and the lower cover to form a battery pack. The series and parallel connections between battery cells and battery cells The relationship is designed according to the needs of the battery pack.

[0026] The charger is a power conversion device used to charge the battery pack. The positive and negative terminals for outputting electric energy are fixed on the upper cover of the battery pack. There is a charging cable clip on the charger, which can be used to clamp the positive and negative electrodes. The terminal is for charging the battery pack. In order to facilitate charging with other parts of the charging device without interference, the positive and negative te...

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Abstract

The invention discloses an apparatus used for lithium battery charging. Through two sets of charging mechanisms, charging equalization work is completed. Compared to dissipative equalization, by using the apparatus, a heat management problem does not exist; compared to non-dissipation equalization of a capacitor or inductance energy storage, by using the method in the invention, an equalization current is large, efficiency is high and a speed is fast; and compared to transformer equalization, by using the method in the invention, a magnetic core and a coil are not needed, nonmagnetic leakage does not exist and the size is controllable.

Description

technical field [0001] The invention relates to the field of lithium battery charging. Background technique [0002] Equalization is a key technology to solve the difference of battery cells. Electric vehicles can be divided into a charging phase and a discharging and idle phase according to the state of use. According to the different working characteristics of the two stages, different equilibrium strategies are formulated respectively. [0003] The purpose of equalization in the charging phase is to make all the cells fully charged, and try to avoid the situation of inconsistent power of the cells. The charging equalization reported in the literature generally uses dissipative equalization or non-dissipative equalization. [0004] In the dissipative equalization scheme, the heat dissipation resistor wastes power and generates a lot of heat, causing thermal management problems, and the equalization current is too soft compared to the charging current. [0005] Non-diss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/443H02J7/0014H02J7/0026H02J7/0036H02J7/0091Y02E60/10
Inventor 宣善俊刘钊见
Owner 安徽安耐捷新能源科技有限公司
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