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A low-temperature heating method based on temperature change for lithium-ion batteries with alternating excitation

A lithium-ion battery, temperature change technology, applied to secondary batteries, circuits, electrical components, etc., can solve problems such as poor charge and discharge performance, and achieve the best low-temperature self-heating effect of the battery

Active Publication Date: 2021-12-03
HARBIN UNIV OF SCI & TECH
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  • 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 poor charging and discharging performance of existing lithium-ion batteries in low-temperature environments, and proposes a low-temperature heating method based on temperature changes for lithium-ion batteries with alternating excitation

Method used

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  • A low-temperature heating method based on temperature change for lithium-ion batteries with alternating excitation
  • A low-temperature heating method based on temperature change for lithium-ion batteries with alternating excitation
  • A low-temperature heating method based on temperature change for lithium-ion batteries with alternating excitation

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specific Embodiment approach 1

[0015] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a method for heating lithium-ion batteries based on temperature changes under alternating excitation low-temperature heating described in this embodiment, the method includes:

[0016] Step 1: Establish the second-order Thevenin equivalent circuit model of the lithium-ion power battery;

[0017] Step 2: Use Laplace transform and recursive least squares method to identify the parameters of components in the second-order Thevenin equivalent circuit model under the current temperature environment;

[0018] Step 3: Using the component parameters identified in Step 2, establish an objective function that takes the internal AC impedance and pulse current frequency of the lithium-ion power battery as objects;

[0019] Step 4: Using the three-dimensional state space method, combined with the objective function of internal AC impedance and pulse frequency in step three, establish a th...

specific Embodiment approach 2

[0021] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment will further explain a kind of lithium-ion battery alternating excitation low-temperature heating method based on temperature change described in the first embodiment, the second-order Thevenin equivalent of the lithium-ion power battery described in step 1 The circuit model includes the 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 ;

[0022] 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 interna...

specific Embodiment approach 3

[0023] Specific implementation mode three: the following combination figure 2 Describe this embodiment, this embodiment will further explain a kind of lithium-ion battery alternating excitation low-temperature heating method based on temperature change described in the second embodiment, the second-order Thevenin equivalent circuit of the lithium-ion power battery described in step 1 The formula for the model is:

[0024]

[0025] Among them, U oc is the open circuit voltage of the lithium-ion battery, 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 polarized 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, 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 relates to a low-temperature heating method based on temperature change for lithium-ion battery alternating excitation, which belongs to the technical field of lithium-ion power battery charging. The invention solves the problem of poor charge and discharge performance of the existing lithium ion battery in a low temperature environment. In the present invention, the battery is supplied with a pulse current of varying frequency at any time, so that the internal resistance of the battery is energized to generate heat, thereby achieving the effect of low-temperature self-heating inside the battery. Based on the second-order Thevenin equivalent circuit model, combined with the recursive least squares method to construct lithium Identify the internal parameters of the ion power battery, and use the three-dimensional state space method to establish the three-dimensional relationship between the internal parameters of the battery and the pulse current frequency and temperature, and calculate the changes in the internal parameters of the battery at different temperatures in real time, as well as the pulse corresponding to the maximum internal resistance of the battery current frequency. The invention is applicable to the technical field of battery charging.

Description

technical field [0001] The invention belongs to the technical field of lithium ion power 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 problems of poor charge and discharge 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, the available capacity of the battery decreases, and the output power drops significantly. This has a great impact on the performance of electric vehicles. Contents of the invention [0003] The object of the present invention is to solve the proble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/633H01M10/615H01M10/625H01M10/651H01M10/654H01M10/657
CPCY02E60/10
Inventor 吴晓刚李凌任
Owner HARBIN UNIV OF SCI & TECH
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