Charge and discharge control method of power battery

A charging and discharging control, power battery technology, applied in the direction of secondary battery charging/discharging, battery/fuel cell control device, control device, etc., can solve the problems of poor charging characteristics, difficult to fully charge the battery, etc., to prolong the service life , improve stability and reliability, and avoid overcharge or overdischarge effects

Inactive Publication Date: 2017-04-26
安徽鸿创新能源动力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In addition, there are many factors that affect the charging efficiency of the battery. Temperature and charging rate are the main factors affecting the charging efficiency. The battery has poor charging characteristics at low temperature, and it is difficult for the battery to be fully charged at low temperature.

Method used

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  • Charge and discharge control method of power battery

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Embodiment Construction

[0029] The BMS control of the battery management system obtains the SOC range of the battery in real time, predicts the maximum charge and discharge current allowed by the battery, and sends these limits to the vehicle controller, which controls the charge and discharge current to not exceed the allowable limit value. Thereby avoiding overcharging or overdischarging the battery, and incorrect charging causing the worst permanent damage to the battery.

[0030] The SOC range of battery work is defined as: overcharge area, energy recovery area, work area, over-discharge buffer zone, and over-discharge area. Set 40% to 70% SOC as the working range; 30% to 40% SOC as the discharge buffer zone; 70% to 80% SOC as the energy recovery range; >80% SOC as the overcharge range; 0, discharging).

[0031] The charging system is working, and the following steps are cyclically executed according to the set frequency (the timing is 50ms for comparative control):

[0032] First read the esti...

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Abstract

The invention discloses a charge and discharge control method of a power battery. According to the increase of remaining power, SOC zones for working of the power battery are sequentially defined as follows: an overdischarge zone, a discharge buffer zone, a working zone, an energy recovery zone and an overcharge zone. A charging system works at a set frequency cyclically in the following steps: 1) reading the SOC estimation value for this time, and judging the zone to which the SOC estimation value belongs; 2) looking up the table to obtain adjustment signals of the maximum current limit value and the relay status control signal value; and 3) executing the adjustment signals. The allowed maximum charge and discharge current of the battery can be predicted according to the status and temperature of the battery, the limiting values are distributed to a vehicle controller, the vehicle controller performs controlling to make sure that the charge and discharge current does not exceed the allowed limiting values, so that the battery is avoided being overcharged or overdischarged, the working stability and reliability of the power battery are improved, the service life of the battery can be effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power batteries, in particular to a power battery charging and discharging control strategy. Background technique [0002] Battery overcharging or overdischarging are the two main causes of battery damage. A major factor for BMS to allow battery charging or discharging is the SOC of the battery. Hybrid batteries require high-power charging capabilities to absorb vehicle braking energy, and at the same time require There is a high-power discharge capability to meet the requirements of auxiliary driving. Therefore, the battery SOC must ensure that it can meet the high-power discharge requirements. At the same time, there must be a certain amount of remaining space to quickly and efficiently absorb the energy generated when the vehicle brakes. [0003] Battery charge control consists of three aspects: [0004] 1. Control the battery to start charging [0005] 2. Dynamically adjust the char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18H01M10/44
CPCB60L58/12B60L58/13B60L58/14B60L2240/545B60L2240/549H01M10/44Y02E60/10Y02T10/70
Inventor 江涛张勇张菁
Owner 安徽鸿创新能源动力有限公司
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