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Method for compensating heating of PTC (Positive Temperature Coefficient) heating element during charging of electric vehicle

A technology of electric vehicles and heating parts, which is applied in the direction of electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of reducing user experience, lagging power of charging piles, and increasing charging time, so as to shorten charging time and improve satisfaction The effect of increasing the charging rate

Pending Publication Date: 2021-11-02
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When electric vehicles are charged at low temperature, they need to be heated while charging. The power requested by the battery from the charging pile includes the power required by the battery itself and the heating power of the PTC heating element. Due to the transient changes in the adjustment of the heating power of the PTC heating element and the charging pile to the There is a lag in the output power of the battery, which makes the battery have the risk of overcharging. Therefore, when the existing electric vehicle uses the PTC heating element to heat while charging, the power compensation value of the PTC heating element is zero or relatively small, resulting in an increase in the charging time. , reducing the user experience

Method used

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  • Method for compensating heating of PTC (Positive Temperature Coefficient) heating element during charging of electric vehicle
  • Method for compensating heating of PTC (Positive Temperature Coefficient) heating element during charging of electric vehicle
  • Method for compensating heating of PTC (Positive Temperature Coefficient) heating element during charging of electric vehicle

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Effect test

Embodiment 1

[0035] This embodiment provides a method for compensating the heating of the PTC heating element when charging an electric vehicle, such as figure 1 shown, including:

[0036] S1, open the PTC heating element 1 (such as image 3 shown) and set its required power, and increase the required power of the PTC heating element 1 to the battery 8 at a preset compensation rate (such as image 3 As shown) in the requested power of the charging pile, the PTC heating element 1 is used for power compensation, and the PTC heating element 1 operates at the actual power;

[0037] S2. Determine whether the difference between the current actually charged into the battery 8 by the charging pile and the current required by the battery 8 itself is greater than the preset overcharge current. Timeout period; if not, execute S4;

[0038] S3, the filter coefficient μ of the PTC heating element 1 i Adjust N times, filter coefficient μ i =μ i-1 -Δμ i , until the difference between the current ac...

Embodiment 2

[0066] This embodiment provides a method for compensating the heating of the PTC heating element when charging an electric vehicle, including:

[0067] S01. When charging the battery 8, the battery 8 requests the power required by the battery 8 from the charging pile according to its state of charge and temperature;

[0068] S02. After a period of time, the output power of the charging pile increases at a preset charging rate;

[0069] S1. Turn on the PTC heating element 1 and set its required power, and increase the required power of the PTC heating element 1 to the power requested by the battery 8 for the charging pile at a preset compensation rate, so as to perform power compensation for the PTC heating element 1, and then When the PTC heating element 1 runs at the actual power, judge whether the output power of the charging pile is greater than the instantaneous overcharge preset power of the battery 8; 8, until the output power of the charging pile is less than the insta...

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Abstract

The invention relates to the technical field of charging of electric vehicles, and discloses a method for compensating heating of a PTC (Positive Temperature Coefficient) heating element during charging of an electric vehicle, which comprises the following steps: S1, starting the PTC heating element, setting the required power of the PTC heating element, and increasing the required power into the required power of a battery to a charging pile according to a preset compensation rate; S2, judging whether the difference value of the current is greater than a preset overcharge current or not, and if so, executing S3; if not, executing S4; S3, adjusting the filter coefficient [mu]i of the PTC heating element for N times, wherein [mu]i=[mu]i-1-[delta][mu]i; and S4, judging whether the number of overcharge times of the battery is greater than a first allowable pre-value n1 or whether the duration of continuous overcharge is greater than a first allowable pre-value m1, and if so, exiting the power compensation for the PTC heating element and operating the PTC heating element according to the actual power. According to the method disclosed by the invention, the actual power of the PTC heating element can be adjusted in real time according to the actual condition in the battery heating process, so that the charging time is shortened.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a method for compensating the heating of a PTC heating element when the electric vehicle is charged. Background technique [0002] When electric vehicles are charged at low temperature, they need to be heated while charging. The power requested by the battery from the charging pile includes the power required by the battery itself and the heating power of the PTC heating element. Due to the transient changes in the adjustment of the heating power of the PTC heating element and the charging pile to the There is a lag in the output power of the battery, which makes the battery have the risk of overcharging. Therefore, when the existing electric vehicle uses the PTC heating element to heat while charging, the power compensation value of the PTC heating element is zero or relatively small, resulting in an increase in the charging time. , reducing the user experience...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L53/62B60L58/15B60L58/27
CPCB60L53/62B60L58/15B60L58/27Y02T10/70Y02T10/7072Y02T90/12
Inventor 徐家良郭丁伊苗春壮
Owner CHINA FIRST AUTOMOBILE
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