Electric car power cell automatic preheating method

A technology for power batteries and electric vehicles, applied in electric vehicles, secondary batteries, electric traction, etc., can solve the problems of battery capacity attenuation, calculation of warm-up time, and energy recovery rate reduction, so as to improve power performance, safety, and energy efficiency. Reduce vehicle power consumption and increase the effect of energy recovery

Inactive Publication Date: 2017-05-10
HUIZHOU BNET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the battery is at different ambient temperatures, the temperature reduction of the battery cannot be estimated, resulting in an unpredictable amount of time to start the vehicle in advance
2. Start the vehicle, and use the heating module and battery charge and discharge to increase the temperature of the battery itself during the driving process. This method will cause battery capacity attenuation and energy recovery rate reduction, which will affect the driver's driving experience.
However, since the device cannot intelligently calculate the preheating time through some time parameters, battery parameters and environmental parameters, it can only decide whether to stop heating by judging whether the battery target temperature is reached after preheating the battery, which will cause power energy to a certain extent. The waste of the preheating method has certain limitations
Similarly, a low-temperature preheating system for an electric vehicle battery pack and its control method disclosed in the Chinese public patent document CN201510975431.4 are also unable to intelligently calculate the preheating time through some time parameters, battery parameters and environmental parameters, so that it has a certain limitations, resulting in waste of electric energy to a certain extent

Method used

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  • Electric car power cell automatic preheating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The driver stopped at 18:00 on September 14, 2016 and artificially set the next start-up time as t1 = 6:00 on September 15, 2016. After the driver closed the vehicle, he recorded the car's flameout time t2 = September 14, 2016 18:05.

[0068] It should be noted that in Embodiment 1, the preset duration Δt1 is 2 hours, which is the best value obtained from experimental data according to the heat preservation and heat dissipation state of the power supply, and can of course be determined according to the actual vehicle condition Adjust accordingly.

[0069] According to the judgment condition, whether the interval between the next start-up time t1 and the car flameout time is greater than the preset time length Δt, if so, the vehicle enters the automatic preheating process for the first time after the preset time length Δt1, and records the time t3 when entering the automatic preheating process. Specifically, when making judgments and comparisons, the time format is year...

Embodiment 2

[0079] The driver stopped at 18:00 on September 14, 2016 and artificially set the next start-up time as t1 = 19:00 on September 14, 2016. After the driver closed the vehicle, he recorded the car's flameout time t2 = September 14, 2016 18:05.

[0080] According to the judgment condition, whether the time interval between the next start-up time t1 and the engine-off time of the car is greater than the preset duration Δt, in this embodiment, the preset duration Δt1 is 3 hours, if so, enters the automatic preheating process, after preheating After setting the time length Δt1, it enters the automatic preheating process time t3. Specifically, when making judgments and comparisons, the format of the time is year, month, day, hour, minute, and second. In this example, the complete format of the next start-up time t1 is 19:00 on September 14, 2016, and the complete format of the car’s flameout time t2 The format is 18:05 on September 14, 2016. In the program, first determine whether t...

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Abstract

The invention discloses an electric car power cell automatic preheating method. According to the characteristics of a cell, the cell preheating time is intelligently computed in combination with related parameters such as car starting time, parking time and the environment temperature. The waiting time of manual preheating by a user is shortened, and the power performance and safety of a car during starting are improved. Capacity fading of the car power cell under the lower temperature condition and damage to the cell during usage under the lower temperature condition are avoided, the service life of the cell is prolonged to a certain extent, meanwhile, the optimal state of the car power cell is reached, energy recovery during car running is improved, and car electricity consumption is reduced. The electric car power cell automatic preheating method is suitable for preheating the electric car power cell.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to an automatic preheating method for a power battery of an electric vehicle. Background technique [0002] In recent years, in order to reduce carbon dioxide emissions and reduce the pressure brought by non-renewable resources, the research and development of electric vehicles has become a hot spot in the automotive industry. Current electric vehicles use lithium-ion batteries as the main power output, but the battery characteristics of lithium-ion batteries deteriorate at low temperatures. When the battery temperature is low, the charging and discharging power of the battery will drop severely and the battery capacity will be seriously attenuated. When the battery temperature continues to drop to the ambient temperature, the battery discharge power will be close to 0, which will cause the vehicle to fail to start or affect the power of the vehicle. At the same time, the mileage of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18H01M10/615H01M10/625H01M10/635
CPCB60L58/27H01M10/615H01M10/625H01M10/635Y02E60/10Y02T10/70
Inventor 徐文赋任素云
Owner HUIZHOU BNET TECH CO LTD
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