Method and device for estimating full charge capacity of lithium battery
A full-capacity, lithium-ion battery technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of cumulative error of Coulomb integral value, easy to cause errors, and insufficient precision, and achieve high adaptability , easy to calculate, high-precision effect
Active Publication Date: 2021-07-16
上海市高级技工学校 +1
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Problems solved by technology
This method has two disadvantages: (1) Affected by the error of the current detection element, the Coulomb integral value has a cumulative error, which causes an error in the full charge capacity; (2) During the charging process, if the charging current does not reach the cut-off current and the charging If the process ends early, the latest estimated value of the full charge capacity cannot be obtained, resulting in the inability to update the full charge capacity in time
Therefore, when using this method to estimate the full charge capacity, the accuracy is not high enough and it is easy to cause errors
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[0042] Such as figure 1 As shown, the present invention discloses a lithium battery full charge and maximum chemical capacity Qmax, a virtual electricity quantity Q using a lithium battery management system. v The approximate relationship between the lithium battery is estimated to the lithium battery, which is a dynamic constant loop process, which is an online estimate of the maximum chemical capacity and charging time constant of lithium batteries. Make sure the full charge capacity is not affected by battery aging and battery temperature changes, while always maintaining high precision.
[0043] This method mainly includes the following steps:
[0044] Step 1: In the initial phase, set two Flash type memory, store the initial value of the maximum chemical capacity Qmax and charging time constant τ, where the charging time constant τ is stored, respectively, where the maximum chemical capacity memory is used to store the initial value of the maximum chemical capacity QMAX, and ...
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The invention relates to a method for estimating the full charge capacity of a lithium battery, comprising the following steps: S1: respectively setting the maximum chemical capacity Qmax and the initial value of the charging time constant τ of the lithium battery; S2: separately judging the maximum chemical capacity Qmax and the charging time Whether the condition for updating the constant τ is true, if so, calculate the corresponding latest value and update it, if not, keep the maximum chemical capacity Qmax and the value of the charging time constant τ unchanged; S3: According to the charging time constant τ and the set cut-off current I c , calculate the virtual power Q v ; S4: According to the maximum chemical capacity Qmax and the virtual charge Q v , Calculate the full charge capacity FCC of the lithium battery. Compared with the prior art, the invention has the advantages of easy detection, high precision and high adaptability.
Description
Technical field [0001] The present invention relates to the field of lithium batteries, and more particularly to a method and apparatus for a lithium battery full charge capacity estimate. Background technique [0002] In recent years, portable electronic products, electric vehicles, electric vehicles, etc. have a growing demand for energy storage devices to promote rapid development of lithium battery technology. Lithium batteries are widely used in daily life and industrial production, and corresponding battery management technology is also increasingly displayed. During the working process of lithium batteries, it is necessary to estimate and monitor their various status parameters to ensure that the lithium battery works in a safe and reliable state. Full ChargeCAPACITIVE (FCC) is an important state parameter for lithium batteries, which refers to a lithium battery under a specific temperature and health condition (State of Health, SOH), from a constant current constant press...
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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 张江安杨洪柏
Owner 上海市高级技工学校