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Alternating excitation low-temperature heating method for lithium-ion power battery

A technology of power battery and heating method, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of decreased charge and discharge performance, decreased activity of active materials, etc., and achieve the effect of optimal battery self-heating effect.

Active Publication Date: 2021-11-19
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the decrease in the charge and discharge performance of the lithium ion power battery caused by the decrease in the activity of the active material in a low temperature environment

Method used

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  • Alternating excitation low-temperature heating method for lithium-ion power battery
  • Alternating excitation low-temperature heating method for lithium-ion power battery
  • Alternating excitation low-temperature heating method for lithium-ion power battery

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specific Embodiment approach 1

[0014] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a lithium-ion power battery alternating excitation low-temperature heating method described in this embodiment, the specific steps of the method are:

[0015] Step 1: Establish the second-order Thevenin equivalent circuit model of the lithium-ion power battery;

[0016] Step 2: Real-time identification of the parameters of the components in the second-order Thevenin equivalent circuit model by using the Laplace transform and the recursive least squares method;

[0017] Step 3: Using the parameters of the components identified in Step 2, write the impedance equation of the equivalent circuit model described in Step 1, and calculate the first and second derivatives of the internal impedance equation of the battery to obtain the lithium-ion power The function of the relationship between the maximum value of the internal AC impedance of the battery and the frequency of the pulse ...

specific Embodiment approach 2

[0020] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment will further explain the low-temperature heating method of a lithium-ion power battery described in the first embodiment, the second-order Thevenin equivalent circuit model of the lithium-ion power battery described in step 1 includes Polarization internal resistance R 1 , Polarized capacitance C 1 , equivalent internal resistance R 0 , equivalent inductance L and open circuit equivalent voltage source U oc ;

[0021] Polarization internal resistance R 1 One end of the polarized capacitor C 1 One end is connected, and the polarization internal resistance R 1 The end of this terminal is connected to the positive pole of the charging power supply; the polarization internal resistance R 1 The other end of the polarized capacitor C is connected at the same time 1 The other end and the equivalent internal resistance R 0 One end of the equivalent internal r...

specific Embodiment approach 3

[0022] Specific implementation mode three: the following combination figure 2 Describe this embodiment, this embodiment will further explain the alternating excitation low temperature heating method of a lithium-ion power battery described in the first embodiment, in this embodiment,

[0023] The formula of the second-order Thevenin equivalent circuit model of the lithium-ion power battery described in step 1 is:

[0024]

[0025] Among them, R 0 is the ohmic internal resistance of the lithium-ion power battery, R 1 is the polarization internal resistance of the lithium-ion power battery, C 1 is the polarization capacitance of the lithium-ion power battery, U is the terminal voltage of the lithium-ion power battery, L is the equivalent inductance of the lithium-ion power battery, U oc is the open-circuit equivalent voltage source of the lithium-ion power battery, I is the charging current of the lithium-ion battery, and s is a variable in the frequency domain.

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Abstract

The invention discloses a low-temperature heating method with alternating excitation of a lithium-ion power battery, which belongs to the technical field of lithium-ion power battery charging. The invention solves the problem that the charging and discharging performance of the lithium-ion power battery is lowered due to the lowering of the activity of the active material in a low-temperature environment. The invention establishes the second-order Thevenin equivalent circuit model of the lithium-ion power battery, uses Laplace transform and recursive least squares method to identify the internal parameters of the lithium-ion power battery in real time; uses the parameters of the components and the impedance of the equivalent circuit model According to the equation, the relationship function between the maximum value of the internal AC impedance of the lithium-ion power battery and the frequency of the pulse current is obtained; according to the pulse current frequency function corresponding to the maximum value of the internal AC impedance of the battery and the internal resistance of the lithium-ion power battery at the current moment, real-time adjustment of the input lithium ion The pulse current frequency of the power battery realizes the alternating excitation heating of the lithium-ion power battery. The invention is suitable for charging lithium-ion power batteries in low-temperature environments.

Description

technical field [0001] The invention belongs to the technical field of battery charging. Background technique [0002] Lithium-ion batteries are gradually replacing other batteries as the main power battery due to their advantages such as high specific power, high energy density, low self-discharge rate and long storage time. Although lithium-ion batteries have many advantages, there are still major problems in the charging and discharging performance of lithium-ion batteries at low temperatures, such as: the activity of various active materials is reduced, the reaction rate of the battery electrode is low, and the graphite negative electrode inside the lithium-ion battery The class impedance increases significantly, and the available capacity of the battery decreases, resulting in a decrease in charge and discharge performance and a significant decrease in output power. Contents of the invention [0003] The purpose of the present invention is to solve the problem that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/633H01M10/615H01M10/654
CPCY02E60/10
Inventor 吴晓刚李凌任
Owner HARBIN UNIV OF SCI & TECH
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