A charging/heating control method for electric vehicle power battery

A power battery and heating control technology, applied in the direction of secondary battery charging/discharging, electric vehicles, battery/fuel cell control devices, etc., can solve the problems of battery damage and uneven heating temperature distribution, avoid overcharging, and realize heating And the effect of charging and reducing energy consumption

Active Publication Date: 2022-01-21
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims to solve the problem that lithium-ion power batteries need to be preheated in low-temperature environments, but the existing external heating devices have uneven heating temperature distribution and are likely to cause damage to the batteries. A charging / heating method for electric vehicle power batteries is proposed. Integrated device and method

Method used

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  • A charging/heating control method for electric vehicle power battery
  • A charging/heating control method for electric vehicle power battery
  • A charging/heating control method for electric vehicle power battery

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specific Embodiment approach 1

[0017] Specific implementation mode one: the following combination figure 1 Describe this implementation mode, a charging / heating control method for an electric vehicle power battery described in this implementation mode, the specific steps of the method are:

[0018] Step 1. Collect the surface temperature T of the lithium-ion power battery, and determine whether the surface temperature T of the lithium-ion power battery is less than the preset temperature threshold T set , if yes, go to step 2, otherwise, go to step 8; where, the temperature threshold T set is a positive number;

[0019] Step 2. Collect the state of charge soc, terminal voltage U and current I of the lithium-ion power battery, and determine whether the state of charge soc of the lithium-ion power battery is less than the set threshold soc set , if so, go to Step 3, otherwise, go to Step 4;

[0020] Step 3: Use an external power source to charge the supercapacitor until the state of charge of the supercapa...

specific Embodiment approach 2

[0028] Specific implementation mode two: the following combination figure 2 Describe this embodiment. This embodiment will further explain the charging / heating control method for an electric vehicle power battery described in Embodiment 1. The first-order Thevenin equivalent circuit model inside the lithium-ion battery includes the ohmic internal resistance R 0 , Polarization resistance R 1 , Polarized capacitance C 1 and open circuit equivalent voltage source U OC ;

[0029] Ohm internal resistance R 0 One end of the connection is connected to the positive pole of the charging power supply, and the ohmic internal resistance R 0 The other end of the polarized capacitor C is connected at the same time 1 one end and the polarization resistance R 1 One end of the polarized capacitance C 1 The other end of the polarizing resistor R 1 The other end of the open circuit equivalent voltage source U OC The positive pole of the open circuit equivalent voltage source U OC The ...

specific Embodiment approach 3

[0030] Specific embodiment three, this embodiment is to further explain a kind of electric vehicle power battery charging / heating control method described in specific embodiment two, the formula of the lithium-ion battery first-order Thevenin equivalent circuit model described in step four is: :

[0031]

[0032] Among them, R 0 is the ohmic internal resistance, R 1 is the polarization internal resistance, C 1 is the polarized capacitance, U OC is the open circuit voltage of the lithium-ion battery, U is the terminal voltage of the lithium-ion battery, and s is the complex frequency.

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Abstract

A charging / heating control method for a power battery of an electric vehicle relates to the technical field of lithium ion power battery heating and charging. It solves the problem that the lithium-ion power battery needs to be preheated when used in a low-temperature environment, and the existing external heating device has uneven heating temperature distribution, which is easy to cause damage to the battery. In the present invention, when the surface temperature of the lithium-ion power battery is lower than the set temperature, if the SOC of the remaining power of the battery is lower than the preset value, the supercapacitor is charged by the power supply, and the supercapacitor charges the lithium-ion power battery through a bidirectional DC / DC. Alternating excitation heating. Otherwise, the self-heating energy is provided by the lithium-ion power battery, and the supercapacitor is charged and discharged with alternating frequency via bidirectional DC / DC to realize the alternating excitation heating of the lithium-ion power battery. When the temperature of the lithium-ion power battery is greater than the set temperature, when When the lithium-ion power battery is not fully charged, it is charged until the lithium-ion power battery is fully charged. The invention is suitable for heating and charging the power battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion power battery heating and charging. Background technique [0002] With the emergence of energy problems, the country strongly supports the new energy industry. Due to its high energy density, low self-discharge rate and no memory effect, lithium-ion batteries have become important energy storage components. In new energy power stations, electric vehicles and other fields have been widely used. [0003] Due to the internal structure and electrochemical properties of lithium batteries, there are major problems in the charge and discharge performance of lithium batteries at low temperatures. As the activity of the active material decreases at low temperature, the internal diffusion rate decreases, the internal impedance of the lithium-ion battery increases significantly at low temperature, the output power decreases, and the available battery capacity also decreases accordingly. At the same tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/615H01M10/617H01M10/625H01M10/633H01M10/657B60L58/12B60L58/27
CPCY02T10/70Y02E60/10
Inventor 吴晓刚崔智昊
Owner HARBIN UNIV OF SCI & TECH
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