On-line judgment method for capacity of backup storage battery

A storage battery and judgment method technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as waste of energy, detachment of battery packs, non-recyclable utilization, etc., to improve timeliness, ensure timeliness, and avoid consumption Effect

Inactive Publication Date: 2010-03-17

哈尔滨龙易电气有限公司

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Problems solved by technology

[0004] 1. It is necessary to separate the battery pack from the working state of the system

The battery pack in the backup power supply is in a backup state for a long time, which brings unsafe hidden dangers to the power supply system.

In addition, this offline discharge process lasts for a long time (including the duration of the checking discharge process and the time it takes for the battery to be fully charged, about 24 hours). Once a power failure occurs in this process, the design function is a backup The battery pack will not be able to provide power supply, which will b...

Abstract

The invention discloses an on-line judgment method for capacity of a backup storage battery. The prior storage battery capacity measuring technology is lagged. The on-line judgment method for the capacity of the backup storage battery comprises the following steps: obtaining a corresponding relationship between the internal resistance and the capacity of the storage battery through actual measurement, setting the internal resistance of the battery obtained according to the capacity of the storage battery from the corresponding relationship as R1, setting the internal resistance of the storagebattery according to the actual measurement as R2, and calculating a reference value R0 of the internal resistance according to the following formula: R0=omega R1 + (1-omega) R2, wherein in the formula, the omega is a weighting coefficient, the measured current internal resistance of the storage battery correspondingly searched from a graph obtained through the actual measurement is Ri, then the percentage of delta R is equal to (Ri-R0)/R0, and the current capacity range of the storage battery can be determined by a corresponding relationship table of the actual measurement according to the numerical value of the percentage of delta R. The method is used for on-line measurement for the capacity of the storage battery.

Application Domain

Electrical testing

Technology Topic

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Experimental program(1)

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[0017] Example 1:

[0018] The online judgment method of the battery capacity of the backup battery includes: the corresponding relationship between the internal resistance of the battery and the capacity of the battery obtained through actual measurement, and the internal resistance of the battery obtained according to the capacity of the battery from the corresponding relationship is set to R 1 , The internal resistance of the actual measurement battery is set to R 2 ,Calculate the internal resistance reference value R according to the following formula 0 : R 0 =ωR 1 +(1-ω)R 2 , Where ω is the weighting coefficient, which can be checked by the graph obtained from actual measurement, and the current internal resistance of the battery is determined to be R i , Then ΔR%=(R i -R 0 )/R 0 , According to the corresponding relationship measured by the actual value of ΔR% image 3 Then the current capacity range of the battery can be determined.

[0019] With the operation of the battery, the internal resistance of the battery will increase to a certain extent, and the capacity of the battery will decrease. In the life cycle of the battery, the relationship between the internal resistance and the capacity is as follows: figure 1 Shown.

[0020] according to figure 1 The corresponding relationship between the battery life cycle process, the battery internal resistance and the capacity of the relationship, you can judge the battery capacity. Due to the large difference in internal resistance of batteries with different nominal capacities, it is necessary to find the internal resistance reference parameter R of the batteries according to the different nominal capacities of the batteries. 0 , Observe the absolute value ΔR of the change in the internal resistance of the battery, and judge the battery capacity through this ΔR.

[0021] But at the same time, as the battery runs, the internal resistance parameters of the battery will increase to a certain extent. The present invention is integrated in the battery monitoring device. In practice, the battery monitoring device is difficult to achieve with the commissioning of the new battery. Installed together, the internal resistance reference parameters need to be modified to solve the deviation of the battery internal resistance reference parameters caused by the installation of the battery pack and the battery monitoring device cannot be synchronized. For this reason, the internal resistance reference parameter R is introduced. 0 Correction.

[0022] Combine the internal resistance parameters of each battery in the current battery pack with the time parameters that the battery has been put into operation, and use mathematical relations to correct the reference value of the battery internal resistance to obtain the reference value R 0 , The reference value R 0 As the core parameter of battery capacity judgment. At the same time, the current battery internal resistance R i , And R 0 Compare, get the absolute value of the battery internal resistance change ΔR, ΔR and R 0 The ratio of is used as the fundamental basis for judging battery capacity.

[0023] For online judgment of battery capacity, the following parameters must be accurately grasped:

[0024] 1) Correspondence between different capacity batteries and internal resistance, the purpose is to obtain R 1. In the fully charged state, since the internal resistance of the battery has the same capacity, the internal resistance is not much different. For this reason, a large amount of actual measurement work can be used to obtain the basic data of the internal resistance of the battery of different capacities under the fully charged condition to obtain R 1. As shown in Table 1:

[0025] Table 1

[0026] battery voltage

[0027] 2) The duration of the battery pack put into operation, the purpose is to obtain ω, in order to determine the internal resistance of the battery R 0 The deviation caused by the difference in the operating time of the battery is corrected to make it close to the internal resistance parameter value of the new battery at the initial stage of operation. The value of ω has a linear relationship with the running time as figure 2.

[0028] 3) Initial measurement of battery internal resistance R 2 , In order to correct the reference value of the internal resistance of the battery.

[0029] Current battery internal resistance R i The internal resistance of the battery measured initially can be the same value at the initial moment, but with the extension of the battery's running time, the internal resistance of the battery will increase to varying degrees, which is R 2 With R i s difference.

[0030] Finally follow the attached image 3 , Find the relationship between ΔR% and battery capacity.

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On-line judgment method for capacity of backup storage battery

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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