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Accumulator internal resistance measurement method

A measurement method and storage battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems affecting measurement accuracy, charger ripple current, noise interference, etc., and achieve strong anti-interference ability and high measurement accuracy Effect

Active Publication Date: 2009-01-07
HEBEI GODSEND HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the instrument using the method of AC injection has many interference factors in measurement, and it increases the complexity of the system, and also affects the measurement accuracy, and there is a problem that it is susceptible to charger ripple current and other noise interference
Some devices cannot test the battery online (connected to the charger and load, and in the state of floating charge)

Method used

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  • Accumulator internal resistance measurement method
  • Accumulator internal resistance measurement method
  • Accumulator internal resistance measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take a 12V, 100Ah UPS battery as an example. When discharging, connect a 6Ω discharge resistor (power 100W) for 12 seconds, and the discharge current I is about 50A. At this time, measure the voltage V1 at both ends of the battery for about It is 12.36V, disconnect the discharge circuit, delay 1 millisecond, measure the voltage V2 across the battery at this time is about 12.6V, use the formula R=(V2-V1)÷I=0.005Ω(5000μΩ).

Embodiment 2

[0026] Take a 6V, 100Ah UPS battery as an example. When discharging, connect a 0.12Ω discharge resistor (power 100W) and discharge for 10 seconds. The discharge current I is about 50A. At this time, measure the voltage V1 at both ends of the battery. It is about 6.2V, disconnect the discharge circuit, delay for 1 millisecond, measure the voltage V2 across the battery at this time is about 6.3V, use the formula

[0027] R=(V2-V1)÷I=0.002Ω (2000μΩ).

Embodiment 3

[0029] Take a 2V, 1000AH battery as an example. When the discharge measurement is in progress, connect a 0.04Ω standby resistor (power 100W), discharge for 7 seconds, and the discharge current I is about 50A. At this time, measure the voltage V1 at both ends of the battery for about It is 2.061V, disconnect the discharge circuit, delay 2 milliseconds, measure the voltage V2 across the battery at this time is about 2.102V, use the formula R=(V2-V1)÷I=0.00082Ω(820μΩ)

[0030] In the side tests of the above three embodiments, the applicant researched and manufactured the "battery internal resistance tester" for measurement, and the "battery internal resistance tester" has applied for a Chinese patent.

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Abstract

The invention relates to an internal resistance measuring method of an accumulator, which belongs to a measuring method that the internal resistance of the accumulator is measured by utilizing heavy current direct current discharge method. The specific steps are as follows: (1) a resistance with high power, high precision and low resistance value is selected as the discharge resistance; (2) close of the high power relay is controlled, and the discharge circuit is switched on to cause the accumulator to perform spark on the discharge resistance from earth. The discharge time is controlled within 7 - 12s and the discharge current I and voltage at both terminals of the accumulator V1 are measured at the same time; (3) the discharge circuit is switched off for a 1 -2ms delay time, and the voltage at both terminals of the accumulator V2 are measured for the moment; and (4) the internal resistance of the accumulator is calculated. The method has the advantages of high measurement accuracy, and strong interference-free feature. The accumulator can be measured on line, the health status of the accumulator can be monitored and capacity of the accumulator can be estimated by the method.

Description

technical field [0001] The invention relates to a method for measuring the internal resistance of a storage battery, which belongs to the method for measuring the internal resistance of the storage battery using a high-current direct-current discharge method of the storage battery. Background technique [0002] At present, the commonly used method for measuring the internal resistance of the battery is the AC injection method. The AC injection method injects a constant AC current signal I into the battery. S , measure the voltage response signal V at both ends of the battery O , and the corresponding difference θ between the two, the internal resistance of the battery is calculated by the following formula: [0003] R = V O I S COSθ ; [0004] By the equivalent circuit of the battery (see figure 1 ), it can be seen that the inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R31/36
Inventor 田晓光刘恒原伟齐国光赵飞
Owner HEBEI GODSEND HIGH TECH
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