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A method for equalizing battery packs of electric vehicles

An equalization method and electric vehicle technology, applied in electric vehicles, charge equalization circuits, battery circuit devices, etc., can solve problems such as BMS aging and circuit complexity, and achieve low cost, simple circuit, and good equalization effect

Active Publication Date: 2018-08-07
HIGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type of charge equalization heating will cause problems such as BMS aging, and the circuit is relatively complicated. The second type needs to manually operate the battery corresponding to each BMS slave control, and also requires special equipment.

Method used

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  • A method for equalizing battery packs of electric vehicles

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Embodiment Construction

[0022] Such as figure 1 As shown, in the electric vehicle battery pack equalization method disclosed in the present invention, a resistor and a Zener diode D1 are connected in parallel to each single cell of the battery pack, and several single cells are connected in parallel with a Zener diode D2. Resistors are used to balance the difference in self-discharge rate, and then Zener diodes D1 and D2 are used to balance charge and discharge to balance the error of resistance balance.

[0023] The size of the resistor is determined by the following method:

[0024] 1) Measure the self-discharge rate Dsn of each single battery in the battery pack;

[0025] 2) Calculate the self-discharge current Isn of the single battery from the self-discharge rate and battery capacity of the single battery;

[0026] 3) Taking the single battery with the largest self-discharge current as the benchmark Is0, calculate the difference between the self-discharge current Isn of each single battery and...

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Abstract

The invention discloses a method for equalizing a battery pack of an electric vehicle. A resistor and a voltage stabilizing diode D1 are connected in parallel to each single cell of the battery pack, and a voltage stabilizing diode D2 is connected in parallel with two or several single cells. The resistors are used to balance the difference in the self-discharge rate, and then the Zener diodes D1 and D2 are used to balance the charge and discharge to balance the error of the resistance balance. The electric vehicle battery pack equalization method provided by the present invention adopts a simple, reliable, and low-cost circuit, does not need any control circuit, does not need to rely on measurement and estimation results, has good equalization effect, and has a fixed and repeated equalization end point without error. The maximum possible capacity of the battery pack can be exerted, and the heat generation can be ignored.

Description

technical field [0001] The invention relates to the technical field of equalization of battery packs, in particular to a method for equalizing battery packs of electric vehicles. Background technique [0002] Due to the materials, manufacturing process, and use environment of lithium batteries, various parameters of the monomers in the battery pack are scattered to a certain extent. Even if the difference in capacity after matching is very small, as small as one-thousandth, due to environmental differences in the use process, differences in self-discharge rates, and differences in capacity attenuation, the balance between each section of the battery pack will be out of balance, which is manifested as They cannot be fully charged at the same time, nor can they be fully discharged at the same time. If it is not balanced, the available capacity of the battery pack will become smaller and smaller, and it will reduce the service life of the battery pack and accelerate the aging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18H02J7/00
CPCB60L58/22H02J7/0016Y02T10/70
Inventor 方兰兰王世强李竞克孙敏刘增洋宋泽琳
Owner HIGER