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"Upside down" data evaluation method for accelerated degradation test of disposable lithium battery capacity

An accelerated degradation test, battery capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problem of data "upside down"

Active Publication Date: 2017-06-23
BEIHANG UNIV
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Problems solved by technology

[0005] (1) The purpose of the present invention: to provide a data analysis and processing method to solve the problem that the data "upside down" phenomenon often occurs when the disposable lithium battery is subjected to a constant high temperature capacity accelerated degradation test

Method used

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  • "Upside down" data evaluation method for accelerated degradation test of disposable lithium battery capacity
  • "Upside down" data evaluation method for accelerated degradation test of disposable lithium battery capacity
  • "Upside down" data evaluation method for accelerated degradation test of disposable lithium battery capacity

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Embodiment Construction

[0084] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0085] The capacity accelerated degradation test is carried out on the WR411400 lithium / sulfur dioxide series battery (abbreviated as WR411400 battery). Each test stage keeps the battery under accelerated stress for 28 days, and then randomly selects it offline for destructive measurement. The test data is as follows: figure 1 and figure 2 shown. Since the mean values ​​of capacity at 65°C and 75°C have different degrees of "inversion", in order to evaluate the storage period with a reliability of 0.9, according to image 3 The shown inventive method flow process is carried out. Table 1 gives the factory capacity data, which is used as the initial capacity data of the battery.

[0086] Table 1 Initial capacity of WR411400 battery

[0087]

[0088] Step 1: Preprocess the initial battery capacity data and the WR411400 battery capacity da...

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Abstract

An 'upside down' data evaluation method of a capacity accelerated degradation test of a primary lithium battery comprises the following steps: 1, preprocessing data of a battery capacity test, 2, carrying out isotonic regression processing on battery capacity data, 3, correcting a standard deviation of battery capacity at each measurement point by keeping a variation coefficient constant, 4, modeling degradation with a percentile value and estimating an acceleration life under each acceleration stress, and 5, extrapolating a storage life at room temperature with an acceleration model. The purposes of life and reliability evaluation by using 'upside down' data existing in the capacity accelerated degradation test of the primary lithium battery are achieved through the above five steps. The method ensures parameter estimation correctness of a degradation model, and reduces evaluation risks caused by the excessive local standard deviations.

Description

technical field [0001] The invention belongs to the technical field of storage period evaluation of disposable lithium batteries, and in particular relates to an analysis and processing method for WR411400 lithium battery capacity data when the "upside down" phenomenon occurs in capacity accelerated degradation tests. Background technique [0002] Primary Lithium Battery (Primary Lithium Battery) is a high-energy chemical primary battery, commonly known as a lithium battery, used to provide continuous or intermittent power to electronic devices. Unlike lithium-ion batteries that can be charged and discharged many times, lithium batteries cannot be reused once the power is exhausted. However, due to their advantages such as high specific energy, long life, and resistance to leakage, they are widely used in cameras and other low-power consumption devices. in electronic products. In addition, disposable lithium batteries are also often used in long-term storage weapons and equ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 马小兵习文刘秀亭
Owner BEIHANG UNIV
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