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Method for estimating state-of-health of battery and device thereof

A technology for battery health status and battery, which is applied to measuring devices, measuring electricity, measuring electrical variables, etc., can solve a large number of problems, increase costs, etc., and achieve the effects of simple installation, low cost, and short test time.

Inactive Publication Date: 2015-10-14
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of building a table of various factors and the SOH of the battery requires a large amount of experimental data to support, which means that a large amount of equipment, time and manpower are required for data collection, which greatly increases the cost

Method used

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  • Method for estimating state-of-health of battery and device thereof
  • Method for estimating state-of-health of battery and device thereof
  • Method for estimating state-of-health of battery and device thereof

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Embodiment Construction

[0016] A method and device for estimating the state of health (SOH) of a battery provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] see figure 1 , battery capacity is an important factor for a battery to hold a maximum charge. The capacity of a new battery is approximately the capacity indicated by the manufacturer. However, it is critical to determine the usage capacity that a battery has after charging so that the battery can perform its intended function. In the setting of the battery capacity, the lower limit voltage 204 is generally set as the basis for the state of charge (SOC) of the battery to drop to 0%. The first curve 201 is the relationship between the open circuit voltage (OCV) value and the current of the battery. The second curve 202 is the relationship curve between the terminal voltage and the current of the battery under the specific current discharge, and the t...

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Abstract

The invention provides a method for estimating a state-of-health (SOH) of a battery and a device thereof. The method comprises the steps of measuring the internal resistance R of the battery; obtaining the voltage drop value deltaV of the battery according to a relational expression deltaV=R*I between the internal resistance R of the battery and the voltage drop deltaV, wherein I is a lower-limit current value which is preset in a using capacity; computing a lower-limit OCV value of the capacitance at this time according to the voltage drop deltaV; acquiring a lower-limit value SOC-1 of the SOC at this time according to a relationship table between the OCV and the SOC of the battery; and acquiring an SOH value according to a relational expression SOH=100%-SOC-1 between the SOH and the SOC-1 of the state-of-charge (SOC) of the battery at this time. According to the method for estimating the state-of-health of the battery, the SOH value is directly computed through the internal resistance of the battery. The method and the device of the invention have advantages of simple method, relatively low cost and short test time.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for estimating the state of health of batteries. Background technique [0002] At present, due to the enhancement of people's awareness of environmental protection and effective and reasonable utilization of energy, electric vehicles with high efficiency, energy saving and environmental protection have become the development trend of the automobile industry. The battery, which is the energy storage device for electric vehicles, has become a research hotspot in this industry. Of course, the ability to accurately measure the state of health (SOH) of the battery is particularly important for the implementation of the entire control strategy of electric vehicles. [0003] In order to indicate the indicator of the state of the battery of the electric vehicle, the concept of SOH is used. SOH is a parameter that reflects the overall performance of the battery and the ability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 施昌沅阮宪熙
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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