Lithium ion power battery internal short-circuit detection method

A power battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as poor detection accuracy, achieve the effects of improving safety and reliability, avoiding thermal runaway, and shortening detection time

Active Publication Date: 2017-09-22
CONTEMPORARY AMPEREX TECH CO +1
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Problems solved by technology

[0007] In view of the problem of poor detection accuracy in the prior art, the object of the present invention is to provide a method for detecting internal short circuits in lithium-ion power batteries, so as to improve the detection accuracy of internal short-circuit detection and improve the safety and reliability of lithium-ion power batteries.

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Embodiment Construction

[0066] In order to make the technical solution of the present invention clearer, the method for detecting the internal short circuit of the lithium-ion power battery of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and not to limit the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0067] Such as figure 1 As shown, 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 a lithium ion power battery, so as to avoid the occurrence of thermal runaway, which specifically includes the following steps:

[0068] S010. Select a sing...

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Abstract

The invention provides a lithium ion power battery internal short-circuit detection method, which comprises the following steps: obtaining working parameters of each lithium ion power battery monomer in a battery module within internal short-circuit experiment time of an internal short-circuit experiment monomer in the battery module; carrying out calculation according to the working parameters of all lithium ion power battery monomers in the battery module and a table look-up function to obtain a first fault bit; obtaining a second fault bit according to monomer voltage in the working parameters of each lithium ion power battery monomer in the battery module; obtaining a third fault bit according to monomer temperature in the working parameters of each lithium ion power battery monomer in the battery module; and calculating a total fault bit according to the first fault bit, the second fault bit, and the third fault bit, and when the total fault bit is larger than or equal to a preset fault bit threshold value, judging that the internal short-circuit experiment monomer has internal short circuit. The lithium ion power battery internal short-circuit detection method improves detection precision of lithium ion power battery internal short-circuit detection.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for detecting short circuits in lithium-ion power batteries. Background technique [0002] Under the dual pressure of energy shortage and environmental pollution, the application of new energy has become an irreversible trend of technological development. The electrification of automobile power system has gradually become the main trend of future automobile technology development. One of the main characteristics of the electrification of the vehicle power system is to use electrical energy instead of chemical energy as the main source of driving energy for the vehicle. Lithium-ion power batteries have become one of the main choices of power sources for electric vehicles because of their high specific energy, low self-discharge rate and long cycle life. [0003] However, in recent years, with the gradual demonstration and application of electric vehicles, safety accid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 潘岳冯旭宁卢兰光欧阳明高李世超卢艳华
Owner CONTEMPORARY AMPEREX TECH CO
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