Method and device for judging short circuit in metal secondary battery

A secondary battery and internal short circuit technology, applied in the field of lithium batteries, can solve the problem of inability to accurately judge the internal conditions of metal secondary batteries, and achieve the effect of small amount of data and accurate judgment

Active Publication Date: 2022-08-09
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a method for judging the internal short circuit of a metal secondary battery to solve the problem that the current battery short circuit detection method cannot accurately judge the internal situation of the metal secondary battery. Early warning of capacity fading and safety issues that may occur during the cycle of secondary batteries

Method used

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  • Method and device for judging short circuit in metal secondary battery
  • Method and device for judging short circuit in metal secondary battery
  • Method and device for judging short circuit in metal secondary battery

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Embodiment 1

[0036] A method for judging a short circuit in a metal secondary battery, comprising the following steps:

[0037] S1, respectively obtain the charging current and the corresponding charging time of the metal secondary battery, as well as the discharging current and the corresponding discharging time, the charging capacity y is equal to the charging current multiplied by the corresponding charging time, and the discharging capacity z is equal to the discharging current multiplied by the corresponding The calculation formula of the discharge time obtains the charge capacity and the discharge capacity, and then the Coulomb efficiency x is obtained from the charge capacity y and the discharge capacity z;

[0038] S2, after the nth cycle of the cycle, if x(n-1)-x(n)>0.7%, y(n)>y(n-1) is satisfied; then continue to the n+1th cycle, if not If satisfied, it is considered that there is no micro-short circuit in the metal secondary battery; after the n+1 cycle is continued, x(n)>x(n+1)...

Embodiment 2

[0041] A method for judging a short circuit in a metal secondary battery, comprising:

[0042] The acquisition module is used to acquire the charging capacity y and the coulombic efficiency x of the metal secondary battery; wherein, the acquisition module includes a capacity acquisition block and a first analysis block connected to the capacity acquisition block, and the first analysis block is used to calculate the metal two The coulombic efficiency x of the secondary battery, and the capacity acquisition block includes a current acquisition block, a time acquisition block, and a second analysis block. The current acquisition block and the time acquisition block are both connected to the second analysis block, and the second analysis block is connected to The first analysis block is connected, the current acquisition block is used to acquire the charging current and the discharge current, the time acquisition block is used to acquire the charging time and the discharging time,...

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Abstract

The present invention provides a method of judging short circuit in the metal secondary battery. By judging the use of computing logic, the charging capacity data and Kuron efficiency data required for computing logic are brought into the calculation logic.The efficiency of the N -1 circle in Kuron's efficiency decreased by more than 0.7 % compared to the N -1 circle, and the charging capacity was improved, which met the operation logic of the first step.Compared with the N -L -Circle, the efficiency of Kuron continued to decline compared to the N -Ling circle, and the charging capacity continued to rise, indicating that there was a slight short circuit inside the battery, and the detection was stopped to deal with the battery.The calculation logic of the present invention is small to obtain the amount of data, and the judgment is accurate. Early warning for short circuit in the metal secondary battery, which greatly improves the security of metal secondary batteries.In addition, the present invention also provides equipment for judging short -circuit in the metal secondary battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method and equipment for judging an internal short circuit of a metal secondary battery. Background technique [0002] With the development of society and the progress of human beings, higher and higher requirements are put forward for secondary power sources. At present, the most widely used secondary power source is the lithium-ion battery, which is also the battery with the highest energy density among the current commercial batteries. However, although the capacity of lithium-ion batteries is much higher than that of traditional lead-acid batteries, due to the limitation of the capacity of positive and negative electrodes, the current capacity of lithium batteries has been difficult to greatly increase. With the increase in the use time requirements of electronic equipment and the increase in the cruising range requirements of electric vehicles, lithium-ion batteries have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R31/378G01R31/385G01R31/387H01M10/42
CPCG01R31/378G01R31/385G01R31/387H01M10/4285Y02E60/10
Inventor 聂阳徐雄文
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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