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Coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of power battery

A Coulombic efficiency and power battery technology, applied in the field of Coulombic efficiency measurement, can solve problems such as changes in Coulombic efficiency, inaccurate SOC estimation, and failure to consider the range of battery capacity, etc., and achieve the effects of easy operation, wide temperature application range, and fast calculation speed

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the capacity range of the battery in actual use is not considered when calculating the coulombic efficiency in the prior art, and the temperature of the battery itself will change during the charging and discharging process, resulting in a change in the coulombic efficiency, thereby affecting the accuracy of the coulombic efficiency, resulting in The inaccurate problem of SOC estimation, the present invention realizes through the following steps:

Method used

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  • Coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of power battery
  • Coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of power battery
  • Coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of power battery

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specific Embodiment approach 1

[0024] Specific implementation mode one: as figure 1 As shown, the Coulombic efficiency measurement of the power battery is carried out through the following steps:

[0025] Step 1: Select a power battery to be tested with an operating temperature range of -20°C-60°C, and select a temperature within this temperature range as the temperature to be tested. The following steps 2 to 7 are all carried out under the temperature conditions to be tested;

[0026] Step 2: Test the mixed power pulse characteristics of the battery to be tested, discharge the battery to be tested, let it rest for an hour, and charge the battery with a constant current that does not exceed the safe current to the m of the available battery power 1 %, then conduct a pulse power test, stand still for an hour, and then charge the battery with a constant current not exceeding the safe current until the power is the m of the available power of the battery 2 %, carry out the mixed power pulse characteristic tes...

specific Embodiment approach 2

[0034] Specific embodiment two: The Coulombic efficiency measurement is carried out on the power battery to be tested in specific embodiment one, and the measurement steps and results are as follows:

[0035] Step 1: Select a temperature of 20°C within the operating temperature range of the power battery to be tested as the temperature to be tested to determine the Coulombic efficiency;

[0036] Step 2: Conduct a mixed power pulse characteristic test on the battery to be tested, discharge the battery to be tested, let it rest for an hour, charge the battery with a constant current not exceeding the safe current to 10% of the battery’s available power, and then conduct a pulse power test , stand still for an hour, and then charge the battery with a constant current not exceeding the safe current until the power is 20% of the battery’s available power, and perform a mixed power pulse characteristic test, and so on, until the charging power is 90% of the battery’s available power,...

specific Embodiment approach 3

[0048] For the power battery to be tested in the second specific embodiment, in step 1, select a temperature of 30° C. within the working temperature range of the power battery to be tested as the temperature to be measured to measure the Coulombic efficiency, n=15 in step 6, other steps and specific implementation methods The two measures Coulombic efficiency in the same way.

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Abstract

The invention discloses a coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of a power battery, relates to the technical field of power batteries or power battery pack management and aims at solving the problems that in the prior art, when the coulomb efficiency is calculated, the capacitance range of the battery in the practical use is not considered, and the coulomb efficiency is not accurate caused by the self temperature change of the battery in charging and discharging process and the like. The method comprises the following specific steps: conducting HPPC (hybrid pulse-power capability) test on a battery to be detected, and recording a voltage time curve and a current time curve in the HPPC test; calculating the relation curve of pulse power capacity and charging electric quantity according to the obtained voltage time curve and current time curve, and calculating the minimum discharging depth and the maximum discharging depth according to the curve; calculating the coulomb efficiency of middle discharging depth; charging the battery to the middle discharging depth, charging for n times to keep the work condition, discharging the battery completely, and calculating the coulomb efficiency of the battery to be detected. The method disclosed by the invention is used for measuring the coulomb efficiency of batteries in the fields of electric automobiles, renewable energy sources, and large-scale energy storage.

Description

technical field [0001] The invention relates to a coulombic efficiency measurement method for estimating the SOC of a power battery, and relates to the technical field of power battery or power battery group management. Background technique [0002] At present, people pay more and more attention to the protection of the environment and the effective and rational use of energy. Therefore, high-efficiency, energy-saving, and environmentally friendly new energy vehicles have become the development trend of the automotive industry. In order to ensure the safety of the power battery and the implementation of the vehicle control strategy, the research and development of the power battery management system is particularly important. Among them, SOC (percentage of remaining power), as the most important factor affecting battery characteristics, is one of the hotspots and difficulties in the research of battery pack management systems in recent years. [0003] The ampere-hour measu...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 朱春波冯飞逯仁贵
Owner HARBIN INST OF TECH
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