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Balance control method for lithium-ion battery pack

A lithium-ion battery pack and equalization control technology, applied in the field of new energy research, can solve problems such as poor balance accuracy

Active Publication Date: 2016-07-27
珠海中力新能源科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor balance accuracy in the balance control o

Method used

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  • Balance control method for lithium-ion battery pack
  • Balance control method for lithium-ion battery pack
  • Balance control method for lithium-ion battery pack

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Embodiment Construction

[0061] This embodiment is described in conjunction with FIG. 1, a lithium-ion battery pack balance control method described in this embodiment, the method includes the following steps:

[0062] Step 1. Establish a single particle model for lithium-ion batteries:

[0063] The lithium-ion battery mechanism model can accurately describe the complex physical and chemical processes inside the battery, and has the ability to simulate and estimate the battery response under arbitrary load current excitation. However, the model usually has a complex form, the calculation is time-consuming, and the parameters of the mechanism model need to be obtained by means of electrochemical measurement methods or intelligent algorithms, which do not have the ability to obtain parameters quickly and non-destructively. At present, common mechanism models are mainly used in the design and improvement of batteries, and are rarely used in battery management systems.

[0064] The single particle model ...

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Abstract

The invention discloses a balance control method for a lithium-ion battery pack, belongs to the field of new energy research and aims at solving the problem of poor balancing accuracy in traditional battery pack balance control. The method comprises the following steps: (1) building a single-particle model for lithium-ion batteries; (2) exerting different excitations on single batteries in the battery pack for balance control and obtaining mechanism parameters of the batteries; (3) detecting status data of the single batteries in the battery pack, and calculating SOC values of the single batteries by the obtained mechanism parameters of the batteries and the status data according to the built single-particle model; (4) obtaining a balance current and balance time by the obtained SOC values of the single batteries according to the requirements of charging balance or discharging balance; and (5) carrying out energy balance control on the single batteries in the battery pack by a balance energy transfer circuit according to the obtained balance current and balance time. The balance control method is used for controlling charging and discharging of the lithium-ion battery pack.

Description

technical field [0001] The invention relates to a lithium-ion battery group balance control method, which belongs to the field of new energy research. Background technique [0002] The outstanding features of lithium-ion batteries are high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and environmental protection. It is the main energy storage device for large equipment or systems. As a high-quality carrier of electric energy, it has a wide range Application prospects. Normally, the battery voltage required to drive a pure electric vehicle is as high as hundreds of volts or even hundreds of volts, so multiple batteries must be connected in series to form a battery pack. However, limited by the production process in the production process of lithium-ion batteries, there are inconsistencies in voltage, capacity, internal resistance, etc. between the cells, even in the same batch of lithium-ion cells as the number of cycles incre...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 吕超刘璇赖庆智王立欣
Owner 珠海中力新能源科技有限公司
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