Alternating excitation low-temperature heating method for lithium ion battery based on temperature change

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: 2019-05-21
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Alternating excitation low-temperature heating method for lithium ion battery based on temperature change
  • Alternating excitation low-temperature heating method for lithium ion battery based on temperature change
  • Alternating excitation low-temperature heating method for lithium ion battery based on temperature change

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specific Embodiment approach 1

[0015] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the method for alternating excitation low-temperature heating of a lithium-ion battery based on temperature changes in this embodiment includes:

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

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

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

[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 three-dimensional state space relationship mode...

specific Embodiment approach 2

[0021] Specific implementation manner 2: the following combination figure 2 This embodiment will be described. This embodiment will further explain the method of alternating excitation low-temperature heating of lithium ion battery based on temperature change described in embodiment 1. The second-order Thevenin equivalent of the lithium ion power battery described in step 1 is Circuit model includes polarization internal resistance R 1 , Polarization capacitance C 1 , Equivalent internal resistance R 0 , Equivalent inductance L and open circuit equivalent voltage source U oc ;

[0022] Polarized internal resistance R 1 Polarized capacitor C 1 Is connected to one end, and the polarization internal resistance R 1 This end of the is connected to the positive pole of the charging power supply; the polarization internal resistance R 1 The other end of the polarizing capacitor C is connected at the same time 1 The other end and equivalent internal resistance R 0 One end, equivalent int...

specific Embodiment approach 3

[0023] Specific implementation manner three: the following combination figure 2 This embodiment will be described. This embodiment will further explain the method of alternating excitation low-temperature heating of lithium-ion battery based on temperature change described in the second embodiment, and the second-order Thevenin equivalent circuit of the lithium-ion power battery described in step one The formula of the model is:

[0024]

[0025] Where U oc Is the open circuit voltage of the lithium ion battery, R 0 Is the ohmic 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, I is the charging current of the lithium-ion battery, and s is the frequency domain variable.

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Abstract

The present invention discloses an alternating excitation low-temperature heating method for a lithium ion battery based on temperature change, and belongs to the technical field of charging of lithium ion power batteries. The present invention solves the problem that the existing lithium ion battery has poor charging and discharging performance in a low-temperature environment. The present invention applies pulse current of the changing frequency to a battery, 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 a second-order Thevenin equivalent circuit model, the internal parameters of the lithium ion power battery are constructed in combination with a recursive least-squares method and are identified; a three-dimensional state space method is used to establish a three-dimensional relationship among the internal parameters of the battery, the pulse current frequency andtemperature; and the change of the internal parameters of the battery at different temperatures and the pulse current frequency corresponding to the maximum internal resistance of the battery are calculated in real time. The alternating excitation low-temperature heating method is suitable for the technical field of charging of the batteries.

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 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 with poor charging and discharging performance of lithium-ion batteries at low temperatures. For example, the activity of various active materials is reduced, the reaction rate of the cell electrodes is low, and the graphite negative electrode lithium-ion battery has various problems. The class impedance is greatly increased, the available battery capacity is reduced, and the output power is significantly reduced. This has a greater impact on the performance of electric vehicles. Summary of the invention [0003] The purpose of the present invention is to solve the problem of poor ...

Claims

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Application Information

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Patent Type & Authority Applications(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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