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Method for measuring states of battery and application of method

A battery state and battery technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of large estimation error, difficult engineering practical application, complicated calculation process, etc., to prolong the service life, save test time and cost, the effect of improving the utilization rate

Active Publication Date: 2016-09-07
未名电池科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among battery state-of-charge estimation methods, the ampere-hour integral method and the open-circuit voltage method are simple and easy to use, but the estimation error is large; the closed-loop estimation method based on the model, such as the Kelman filter method, has high estimation accuracy, but The calculation process is complicated and not easy to apply in engineering practice

Method used

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  • Method for measuring states of battery and application of method
  • Method for measuring states of battery and application of method
  • Method for measuring states of battery and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 Establishment of first-order RC equivalent circuit model parameters and relationship between SOH and SOC

[0058] This example simulates the working condition of the automobile power battery, measures its current and voltage in the simulated working condition in real time, and extracts three parameters of the corresponding first-order RC equivalent circuit model according to a series of current and voltage, the series resistance Value, parallel resistance value and parallel capacitance value; establish the relationship between series resistance value, parallel resistance value and parallel capacitance value and SOH, and establish the relationship between parallel capacitance value and SOC, and finally establish this example through these associations battery status measurement method. In this example, the first-order RC equivalent circuit model is as figure 2 As shown in the figure, R s is the series resistance, R p is the parallel resistor, C p is a p...

Embodiment 2

[0086] Example 2 Battery sample test

[0087] Battery sample test, the battery sample is tested according to the measurement method in Embodiment 1. In this example, a used battery sample of unknown condition and a brand-new battery sample are used for the test respectively. The used battery sample and the brand-new battery sample are both of the same battery model. In this example, the lithium iron phosphate battery of model 32650 is specifically used. , and its rated capacity is 5Ah.

[0088] During the test, the two battery samples were charged in advance, the charging method was the same as that of Example 1, and then discharged by the same method as in Example 1. Similarly, the terminal voltage and current data of the battery during the discharge process were collected by a charge-discharge instrument. Select the 4C current rate in the working condition, and calculate the ohmic internal resistance, parallel internal resistance and parallel capacitance of the battery resp...

Embodiment 3

[0090] Embodiment 3 Remaining life measurement

[0091] In this example, after the battery is charged, the SOH value is calculated according to the ratio of the fully charged battery capacity to the rated capacity of the battery. If the SOH value is greater than or equal to 80%, it is judged that the battery is in a healthy state. If the SOH value is less than 80%, it is judged The battery is in an unhealthy state. After judging that the battery is in a healthy or unhealthy state, the remaining cycle life of the battery is judged according to the SOH value, which specifically includes calculating the remaining cycle number of the battery according to formula 3,

[0092] Formula three:

[0093] Among them, SOH is the SOH value, that is, the capacity retention rate, N is the number of remaining cycles, and e is a natural constant.

[0094] Formula 3 is the corresponding relationship between the battery capacity retention rate data and the number of cycles obtained according ...

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Abstract

The invention discloses a method for measuring the states of a battery and application of the method. The method for measuring the states of the battery includes the following steps that: (1) the current and voltage of the battery in operating are measured; (2) the series resistor resistance value, parallel resistor resistance value and parallel capacitance value of a first-order RC equivalent circuit model are extracted by adopting the least square method according to the measured current and voltage values; and (3) the state of heath (SOH) of the battery is preliminarily judged according to an interval where the extracted series resistor resistance value is located, and the state of heath of the battery is judged according to intervals where the parallel resistor resistance value and the parallel capacitance value are located. With the method of the invention adopted, the state of heath and the state of charge of the battery in a use process can be described authentically and comprehensively, and the determination of the performance of the battery and the prolonging of the service life of the battery can be benefitted, and the battery can be fully utilized. According to the method of the invention, only the current and voltage of the battery are required to be tested online, and therefore, test time and cost can be saved, and the usage rate of the battery can be improved. The method is suitable for establishing the service life prediction models of various retired lithium ion batteries.

Description

technical field [0001] The present application relates to the field of battery state detection, in particular to a method for measuring battery state and its application. Background technique [0002] The real-time state measurement technology of power battery state for electric vehicles is one of the key technologies for the popularization and application of electric vehicles. The real-time measurement content of its power battery state includes battery state of health (abbreviation SOH) measurement technology and battery state of charge (abbreviation SOC) measurement technology. [0003] Among them, SOC refers to the ratio of the current remaining capacity of the battery to the capacity of the fully charged state of the battery, and its value range is between 0-1. When SOC=1, it means that the battery is fully charged. . SOH refers to the ratio of the capacity of the battery in a fully charged state to the rated capacity of the battery. Similarly, its value ranges from 0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36B60L11/18
CPCB60L58/12G01R31/3842Y02T10/70
Inventor 乔荣学任文举林原潘锋
Owner 未名电池科技(深圳)有限公司
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