Method and system for detecting internal short circuit of power battery

A power battery and internal short-circuit technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., can solve the problems of ion irreversibility, puncture, and internal short-circuit detection without a direct implementation method

Active Publication Date: 2018-08-24
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The internal short circuit of the power battery is a safety-related problem during the use of the power battery. The following points may cause the internal short circuit of the power battery: First, the power battery is charged at low temperature, which is determined by the performance of the power battery, such as charging at low temperature , the battery is easy to form crystals, and the cumulative growth of crystals will pierce the battery diaph

Method used

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  • Method and system for detecting internal short circuit of power battery
  • Method and system for detecting internal short circuit of power battery
  • Method and system for detecting internal short circuit of power battery

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Embodiment 1

[0048] figure 1 It is a schematic flow chart of a method for detecting a short circuit inside a power battery according to an embodiment of the present invention, as shown in figure 1 As shown, a method for detecting an internal short circuit of a power battery, the method for detecting an internal short circuit of a power battery specifically includes the following steps:

[0049] Step 101: Collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs.

[0050] Step 102: Judging whether each of the terminal voltages is greater than the voltage threshold, and obtaining a first judgment result; if the first judgment result indicates that the terminal voltage is greater than the voltage threshold, then perform step 103; if the first judgment If the result indicates that all the terminal voltages are less than or equal to the voltage threshold, step 104 is executed.

[0051] Step 103: Judging whether the duration of all the t...

Embodiment 2

[0062] To achieve the above object, the present invention also provides a detection system for internal short circuit of a power battery.

[0063] figure 2 It is a schematic structural diagram of a power battery internal short circuit detection system according to an embodiment of the present invention, as shown in figure 2 As shown, the power battery internal short circuit detection system includes:

[0064] The terminal voltage collection module 201 is used to collect the terminal voltage of each battery pack in the power battery; the power battery includes n battery packs.

[0065] The first judging result obtaining module 202 is configured to judge whether each of the terminal voltages is greater than a voltage threshold to obtain a first judging result.

[0066] The second judgment result obtaining module 203 is configured to judge whether the duration of all the terminal voltages greater than the voltage threshold is greater than a preset time when the first judgment...

Embodiment 3

[0077] An embodiment of the present invention provides a method for detecting an internal short circuit of a lithium ion power battery, which is used to detect whether an internal short circuit occurs in the lithium ion power battery, so as to avoid serious accidents.

[0078] image 3 It is a schematic structural diagram of a device for collecting each terminal voltage of a lithium-ion power battery according to an embodiment of the present invention; image 3 As shown, since the lithium-ion power battery pack used in the electric vehicle contains 42 battery packs, 42 terminal voltages are collected. Since the battery pack voltage acquisition chip detects the voltage of 12 battery packs at most, four battery pack voltage acquisition chips are required, of which three battery pack voltage acquisition chips collect 36 battery pack voltages, and the remaining 6 battery packs also need a battery pack Voltage acquisition chip, so this battery pack voltage acquisition chip needs t...

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Abstract

The invention discloses a method and system for detecting the internal short circuit of a power battery, the method comprising: acquiring the terminal voltage of each battery pack in the power battery; connecting all terminal voltages in series and constructing a closed detection model; calculating a correlation coefficient of each two adjacent terminal voltages, and determining the correlation coefficient as a detection coefficient of the battery pack corresponding to the previous one of the two adjacent terminal voltages; determining whether all the detection coefficients are higher than a set threshold; if so, determining that a short-circuit fault does not occur inside the power battery; if not, determining that the short-circuit fault occurs in the battery packs corresponding to the detection coefficients not higher than the set threshold. By constructing the closed detection model, the method, on one hand, can quickly and effectively detect the short circuit fault of the batteryand ensure the safety of the power battery, and on the other hand, can accurately and effectively position the fault to solve inaccurate and unstable short-circuit detection inside the power battery in the prior art.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a method and system for detecting short circuits inside a power battery. Background technique [0002] Power batteries have been widely used in electric vehicles, and the safety and reliability of power batteries are directly related to the safe use of electric vehicles. The application of power batteries is affected by its characteristics, and has special requirements for ambient temperature and usage methods. In the application process, it is not only necessary to ensure that it operates in a good temperature environment, but also to set a reasonable usage method and detection method. , The reasonable use method ensures the maximum performance of the power battery, and the detection method ensures that the power battery can be found in time when there is a problem, so as to avoid causing greater damage to the power battery or even battery safety accidents. [0003] The...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/36
CPCG01R31/385G01R31/396G01R31/50
Inventor 王震坡李晓宇张雷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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