Method for estimating low temperature available energy of power lithium ion battery pack
A lithium-ion battery pack, lithium-ion battery technology, applied in the measurement of electrical variables, measurement of electricity, measurement devices, etc., can solve the problems of charge and discharge performance degradation, poor customer experience, insufficient vehicle cruising range, etc., to achieve simple and easy. Achieve and facilitate the effect of engineering application
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[0023] The present invention will be further described below in conjunction with the accompanying drawings:
[0024] like figure 1 , 2 As shown, the method for estimating the low-temperature available energy of a power lithium-ion battery pack in this embodiment includes the following steps:
[0025] S1: Under the condition of 25 ℃, the discharge test of the single power lithium battery is carried out, and its discharge energy is recorded as E 0 =318.45Wh, discharge test of single power lithium-ion battery at different temperatures (10℃, 0℃, -10℃, -20℃, -30℃), and record the discharge energy E T . As shown in Table 1:
[0026] Table 1
[0027]
[0028] S2: Perform polynomial fitting on the discharge energy of lithium batteries at different temperatures measured in an incubator, and establish a battery discharge energy-temperature model. In this embodiment, a quadratic polynomial is used for fitting, and the fitting model is as follows:
[0029] λ=1-E T / E 0 =AT 2 ...
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