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Online discrimination method for open-circuit battery in battery pack

A technology for open-circuit batteries and battery packs, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., which can solve the problems of difficulty in finding single open circuits, high risk of battery open circuits, and battery detection, so as to reduce the risk of open circuits and eliminate accidents. hidden effect

Pending Publication Date: 2020-11-06
陈永强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the design, production, use and maintenance of the battery itself, the failure of the battery occurs from time to time. However, because the interior of the valve-regulated battery is in a sealed state, it is impossible to regularly detect the internal condition of the battery. It is difficult to identify open-circuit single cells by means of testing cell voltage
Battery offline discharge test is an effective method to detect battery open circuit at present, but the discharge test can only be performed periodically, the longer the interval between two discharge tests, the greater the risk of battery open circuit during this period

Method used

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  • Online discrimination method for open-circuit battery in battery pack
  • Online discrimination method for open-circuit battery in battery pack
  • Online discrimination method for open-circuit battery in battery pack

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Experimental program
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Embodiment

[0024] A bank is equipped with a battery pack consisting of 16 12V 65AH batteries. Number the 16 batteries sequentially: 1#, 2#, ..., 16#. Adopt the screening method of the present invention to carry out real-time open-circuit screening for each battery in the storage battery pack, and obtain the current by detecting the current of each battery figure 2 The resulting plots of current, cell internal resistance, and voltage for each cell are shown. from figure 2 It can be seen that the current of the 4# battery is 0.515A, which is obviously smaller than the current value of other batteries (about 2A); the internal resistance of the 4# battery is 595.925mΩ, which is far greater than the internal resistance of other batteries (about 14mΩ) ). At the same time, the internal resistance and current comparison of the 16 batteries are shown in Table 1.

[0025] Table 1 Comparison of internal resistance and maintenance current of 16 batteries

[0026]

[0027] It can be seen fr...

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Abstract

The invention discloses an online discrimination method for an open-circuit battery in a battery pack. The method comprises the steps of enabling a pulse power supply to be connected to each single battery in the battery pack in a time-sharing manner, not loading the pulse power supply to a certain single battery when the pulse power supply is connected to the single battery, and detecting the static voltage Vj of the single battery; applying a pulse power supply to the single battery, and detecting the dynamic voltage Vd of the single battery; detecting a flow value I0 when the pulse power supply is loaded; calculating the internal resistance Ri of the single battery; if the Ri is greater than four times of the standard internal resistance of the single battery, the single battery being seriously deteriorated, and if the Ri is greater than 20 times of the standard internal resistance of the single battery, the single battery being judged as a battery open circuit. According to the discrimination method, the pulse source is used for successively and circularly detecting each single battery in the battery pack, whether the storage battery is open-circuited can be detected in real time, and the open-circuit risk of the storage battery is reduced. And time and labor are saved, and potential accidents are eliminated.

Description

technical field [0001] The invention belongs to the technical field of storage battery identification and relates to an online identification method for open-circuit batteries in a battery pack. Background technique [0002] The storage battery used in the data center can reliably supply power to the electrical equipment under the condition of AC power failure. As a result, the overall performance of the entire battery pack drops sharply. The physical damage of a single battery includes open circuit, water loss, short circuit, acid leakage, active material falling off, etc. Open circuit is a form of physical damage. When a single battery is open circuited, it will cause the failure of the entire battery pack and eventually lead to serious accidents. [0003] Currently, data centers use valve-regulated lead-acid batteries. After 5 to 8 years of use, the internal resistance of the battery will increase, the capacity will decrease and eventually fail. Most data center accid...

Claims

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Application Information

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IPC IPC(8): G01R31/385G01R31/396G01R31/54
CPCG01R31/385G01R31/396G01R31/54
Inventor 陈永强
Owner 陈永强
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