Low-temperature rapid heating method and system for power battery pack for electric vehicle

A power battery pack and rapid heating technology, applied in electric vehicles, secondary batteries, electric traction, etc., can solve problems such as difficulty in ensuring heat uniformity, increased temperature difference of battery modules, and slow heating speed, etc., to achieve heating Fast speed, improved heating efficiency, and short heating time

Active Publication Date: 2015-05-20
FAWER AUTOMOTIVE PARTS
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Problems solved by technology

[0004] The invention discloses a low-temperature rapid heating method and system for electric vehicle power battery packs, in order to solve the problem of slow heating speed, long heating

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  • Low-temperature rapid heating method and system for power battery pack for electric vehicle
  • Low-temperature rapid heating method and system for power battery pack for electric vehicle
  • Low-temperature rapid heating method and system for power battery pack for electric vehicle

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Embodiment Construction

[0019] An embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The low-temperature rapid heating method of the electric vehicle power battery pack in the embodiment of the present invention adopts the method of instantaneous short circuit, and the instantaneous short circuit time is t, a large short-circuit current I is generated in the system, and a value is generated on the internal resistance Ri of the power battery pack for W=I 2 ×Ri×t heat, the heat evenly occurs inside each battery module of the power battery pack B1; a momentary short circuit generates a large current, and then heats up the power battery pack B1 through the internal resistance Ri of the battery pack itself. Since the power battery pack B1 is composed of battery modules in series, each battery module can be heated evenly, and the heat is generated inside the battery and diffused from the inside to the outside, thereby achieving rapi...

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Abstract

The invention discloses low-temperature rapid heating method and system for a power battery pack for an electric vehicle. The low-temperature rapid heating system comprises a battery management system and a heating controlling system, wherein the battery management system is used for managing energy and heat of the power battery pack and carrying out short circuit protection; the heating controlling system consists of a controller, two IGBT transistors, an inductor and two diodes; the controller controls the two IGBT transistors by applying a pulse width modulated signal to realize a transient short circuit and drives the two IGBT transistors to be simultaneously connected or disconnected so as to control a current in a loop; by virtue of a pulse width modulation mode, the connection and disconnection states of the first and second IGBT transistors are continuously regulated, so that a current in the inductor fluctuates by being lower than a fixed value limited by bus insurance. According to the low-temperature rapid heating method and system disclosed by the invention, the current repeatedly passes through an internal resistor of the battery to generate heat for heating the power battery pack, and the battery pack is rapidly heated. The low-temperature rapid heating method and system have the advantages that large heating current and the controllability of the system are both ensured; the battery heating efficiency is improved by adopting a method of the transient short circuit.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics, and relates to a low-temperature rapid heating method and system for a power battery pack of an electric vehicle; it is especially suitable for heating the battery pack of a pure electric passenger car. Background technique [0002] With the development of new energy vehicles, lithium battery power battery packs are used more and more widely, and the battery pack will inevitably encounter low temperature environments during use. At low temperatures, there are still major problems with the charging and discharging performance of lithium batteries, which has a greater impact on the use of new energy vehicles. Therefore, the heating function of the battery pack is particularly important in low temperature environments. [0003] Most of the existing lithium battery heating systems install a heating film or heater on the lithium battery, start the heating device at low temperature, fir...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/625B60L11/18
CPCY02E60/10Y02T10/70
Inventor 孙永乐王微周鑫韩笑陈洪斌
Owner FAWER AUTOMOTIVE PARTS
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