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New energy automobile power battery top-speed flexible charging control method and system and automobile

A charging control method and new energy vehicle technology, applied in secondary battery charging/discharging, battery circuit devices, batteries, etc., can solve problems such as poor real-time performance, large amount of calculation, and failure to consider the impact of battery life, etc., to achieve battery damage Small, little impact on battery life, fast warm-up

Inactive Publication Date: 2021-03-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that this charging method needs to model each battery cell in the battery pack, which has a large amount of calculation and poor real-time performance, especially the impact on battery life is not considered in the charging target

Method used

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  • New energy automobile power battery top-speed flexible charging control method and system and automobile
  • New energy automobile power battery top-speed flexible charging control method and system and automobile
  • New energy automobile power battery top-speed flexible charging control method and system and automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] refer to figure 1 , the new energy vehicle power battery extremely fast flexible charging control method of this embodiment includes the following steps:

[0035] Step 1: Use the two-way charging system to generate sinusoidal AC current with a set frequency to charge and discharge the battery. With the help of the ohmic heat generated by the battery, the battery is quickly preheated from the inside to the outside, and the preheating is stopped when the set temperature is reached.

[0036] Considering the difference between the internal core temperature and the surface temperature of the battery, the section of the lithium-ion battery is divided into two parts: the core and the case. Such as figure 2 An equivalent thermal model of a cylindrical Li-ion battery is given. according to figure 2 , Equation (1) gives the differential equation of battery core temperature and surface temperature, which can realize the estimation of battery core temperature.

[0037]

[...

Embodiment 2

[0051] This embodiment provides a new energy vehicle power battery extremely fast flexible charging control system, which is characterized in that it includes:

[0052] (1) AC preheating control module, which utilizes image 3 Set the sinusoidal AC current with a frequency of 1Hz and an amplitude of 3C to charge and discharge the battery. With the help of the ohmic heat generated by the battery, the battery is quickly preheated from the inside to the outside. After reaching the set temperature, the preheating is stopped, and the battery temperature changes. curve like Figure 4 As shown, it takes about 300s to heat the battery core from 25°C to 50°C.

[0053] Preferably, a bidirectional charging system is used to generate a sinusoidal alternating current at a set frequency. The frequency of the sinusoidal alternating current is 1-100Hz, and the amplitude is 3C-5C. Utilizing the sinusoidal alternating current in this frequency and amplitude range can realize fast charging an...

Embodiment 3

[0063] This embodiment provides a new energy vehicle, which includes a new energy vehicle power battery, a bidirectional charging and discharging system, and the new energy vehicle power battery extremely fast flexible charging control system as described in the second embodiment.

[0064] Among them, the new energy vehicle power battery and the two-way charging and discharging system are existing structures, which will not be described in detail here.

[0065] The specific structure of the ultra-fast flexible charging control system for the power battery of a new energy vehicle is described in Embodiment 2, and will not be repeated here.

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Abstract

The invention discloses a new-source automobile power battery top-speed flexible charging control method and system and an automobile. The control method comprises the steps: employing a bidirectionalcharging system for generating a sine alternating current with the set frequency to conduct alternating current charging and discharging on a battery, performing rapid and efficient preheating on thebattery from inside to outside by means of ohm heat production of the battery, and stopping preheating after the set temperature is reached; and then charging the battery by adopting constant current, and after the voltage of the battery reaches a cut-off voltage, carrying out constant-voltage charging on the battery by the cut-off voltage. The charging speed of the new energy automobile is increased, battery lithium precipitation is avoided, the influence on the service life of the lithium ion battery is small, additional battery preheating equipment is not needed, implementation is easy, and the application prospect is very wide.

Description

technical field [0001] The invention belongs to the field of power batteries of new energy vehicles, and in particular relates to a control method, system and vehicle for extremely fast and flexible charging of power batteries of new energy vehicles. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] As we all know, extremely fast charging (10 minutes of charging, 400 kilometers of battery life) is an important means to realize the large-scale popularization of electric vehicles. At present, countries all over the world attach great importance to and actively deploy ultra-high power charging infrastructure networks. In 2018, the U.S. Department of Energy (DOE) invested $19 million in the development of an ultra-fast charging technology with a charging power of 350kW, and plans to build 2,000 ultra-fast charging stations; BMW, Daimler, Volksw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/613H01M10/625H01M10/637H02J7/00
CPCH01M10/446H01M10/613H01M10/625H01M10/637H02J7/00712H01M2220/20Y02E60/10
Inventor 张承慧商云龙殷培鑫鲁高鹏段彬张奇
Owner SHANDONG UNIV
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