Electric vehicle, electric vehicle power system and battery heating method

A technology of electric vehicles and power systems, applied in the field of electric vehicles, can solve problems such as damage to the life of battery packs, internal short circuits, and potential safety hazards, and achieve the effects of reducing the use of low-temperature environments, meeting driving and charging requirements, and high heating efficiency

Active Publication Date: 2016-02-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ambient temperature is too low, the internal battery of the electric vehicle will have the following problems: (1) At low temperature, lithium ions are easy to deposit on the negative electrode, lose electrical activity, and may even cause safety problems
Therefore, vehicles and battery packs are often used at low temperatures, which will greatly damage the life of the battery pack, and may cause safety hazards in severe cases
(2) At low temperature, when lithium-ion batteries are charged, lithium ions are easily deposited on the negative electrode and become dead lithium, and the capacity that the battery can exert is significantly reduced, and in the process of continuous use, these deposited lithium grows larger and may even Cause internal short circuit, causing safety hazard
(3) At low temperature, the discharge capacity of the battery is limited, which is not conducive to driving
Most of these schemes use external large heating equipment and power supply to heat the battery, so these schemes are only suitable for instances where the battery is fixed
In addition, using an external power source to heat the battery of a pure electric vehicle has limitations and is not suitable for vehicles that are not fixed
Therefore, these heating technologies have not been widely used in pure electric vehicles

Method used

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  • Electric vehicle, electric vehicle power system and battery heating method
  • Electric vehicle, electric vehicle power system and battery heating method
  • Electric vehicle, electric vehicle power system and battery heating method

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0029] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

A power system of an electric vehicle, an electric vehicle comprising the same and a method for heating a battery group of the electric vehicle are provided. The power system comprises: a battery group (101), a battery heater (102) connected with the battery group (101); a battery management device (103) configured to control the battery heater (102) to heat the battery group (101) in a running heating mode or in a parking heating mode according to a temperature and a residual electric quantity of the battery group (101) when the temperature of the battery group (101) is lower than a first heating threshold and the residual electric quantity of the battery group (101) is larger than a parking electric quantity threshold, and to determine whether to control the battery heater (102) to heat the battery group (101) according to a current throttle depth change rate of the electric vehicle; an electric distribution box (104); a motor (105); a motor controller (106); and an isolation inductor (L2).

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery heating method of an electric vehicle, a power system of the electric vehicle using the method, and an electric vehicle with the power system. Background technique [0002] With the continuous development of science and technology, new energy vehicles, especially pure electric vehicles, are slowly entering every family as a means of transportation. Users have higher and higher requirements for vehicle performance, especially for comfort. Vehicles are required to adapt to different driving needs. However, most pure electric vehicles at this stage obviously cannot meet this requirement, especially in the cold winter, when the temperature is too low, the performance of the power battery will decline, both in terms of discharge capacity and battery capacity. Can't even use it. Specifically, the general operating temperature of power batteries, especially lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18H01M10/615
CPCB60L1/003B60L1/02B60L3/0023B60L50/52B60L58/12B60L58/26B60L58/27B60L2240/545B60L2250/16H01M10/615H01M10/625H01M10/63H01M10/633Y02E60/10Y02T10/70
Inventor 伍星驰王洪军谢世滨
Owner BYD CO LTD
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