Lithium precipitation detection method and device and polarization ratio acquisition method and device
A detection method and lithium-evolution technology, which are applied in measurement devices, circuit devices, battery circuit devices, etc., can solve the problems of affecting accuracy and poor accuracy of lithium-evolution detection results, and achieve the effect of easy acquisition and accuracy.
Active Publication Date: 2021-04-16
HUAWEI TECH CO LTD
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[0004] However, factors such as the material of the reference electrode and its position in the rechargeable battery will affect the accuracy of the measured potential of the negative electrode relative to the reference electrode, resulting in poor accuracy of the lithium analysis results.
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[0083] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.
[0084] For ease of understanding, terms involved in the embodiments of the present application are firstly explained below.
[0085] Lithium analysis is a phenomenon in which when lithium ions cannot be inserted into the negative electrode in the same amount after they are released from the positive electrode of the battery, the lithium ions that cannot be inserted into the negative electrode of the battery get electrons near the negative electrode of the battery, thereby forming a silver-white lithium element.
[0086] Terminal voltage is the voltage difference between the positive and negative terminals of the battery.
[0087] Positive pole voltage: The voltage difference of the positive pole with respect to the reference pote...
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The invention discloses a lithium precipitation detection method and device and a polarization ratio acquisition method and device, and belongs to the technical field of rechargeable batteries. The method comprises: acquiring an open-circuit voltage of a rechargeable battery and a negative open-circuit voltage of the rechargeable battery based on a state of charge of the rechargeable battery (205); based on the open-circuit voltage of the rechargeable battery, the terminal voltage of the rechargeable battery, and the polarization ratio of the rechargeable battery, obtaining a negative polarization voltage of the rechargeable battery (206), the polarization ratio of the rechargeable battery representing a ratio of the negative polarization voltage of the rechargeable battery to the polarization voltage of the rechargeable battery when the rechargeable battery is at a lithium precipitation critical point; acquiring a negative voltage of the rechargeable battery based on the negative open-circuit voltage of the rechargeable battery and the negative polarization voltage of the rechargeable battery (207); based on the negative electrode voltage of the rechargeable battery, determining whether or not lithium precipitation occurs in the rechargeable battery (208). The method improves the accuracy of lithium precipitation detection.
Description
technical field [0001] The present application relates to the technical field of rechargeable batteries, in particular to a lithium analysis detection method and device, and a polarization ratio acquisition method and device. Background technique [0002] With the development of new energy technology, more and more users use electric vehicles to travel, and the battery safety of electric vehicles has also received more and more attention. Among them, the lithium analysis of rechargeable batteries of electric vehicles is an important factor affecting battery safety. Therefore, the diagnosis and prevention of lithium analysis of rechargeable batteries has become an important technical work. [0003] In the related technology, the rechargeable battery can be transformed into a battery with a positive electrode, a negative electrode and a reference electrode, and then the potential of the negative electrode relative to the reference electrode is measured during charging, and the...
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Login to View More IPC IPC(8): G01R31/378G01R31/385
CPCG01R31/378H01M10/44Y02E60/10G01R31/392H02J7/0047H01M10/42H01M10/052H01M10/0525H01M2010/4271H01M10/425H01M10/48H01M10/4285G01R31/396G01R31/388G01R31/364
Inventor 袁世斐刘兵晓吴志伟
Owner HUAWEI TECH CO LTD