A low-temperature self-heating system and method for power batteries based on instantaneous external short circuit
An external short circuit and power battery technology, applied in battery temperature control, secondary batteries, circuits, etc., can solve the problems of slow heating speed and low efficiency, and achieve the effect of simple method, reduced capacity and easy realization
Active Publication Date: 2021-10-15
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
At present, how to quickly and efficiently heat the power battery at low temperature is a technical problem. Traditional heating methods generally have the problems of low efficiency and slow heating speed.
Method used
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[0042] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples. A low-temperature self-heating system for a power battery based on an instantaneous external short circuit, such as figure 2 As shown, including: relay, battery management system;
[0043] The two ends of the relay are respectively connected to the positive and negative poles of the power battery pack to be heated, the power battery pack to be heated is connected to the battery management system, and the battery management system is connected to the relay;
[0044] The relay is a remote control relay, which is controlled by the battery management system and provides an external short-circuit environment for the power battery pack to be heated. It is in an open state under normal conditions. When the power battery pack to be heated requires an external short-circuit environment, the relay is in a closed state;
[0045]The battery management s...
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The present invention proposes a low-temperature self-heating system and method for a power battery based on an instantaneous external short circuit, including: a relay and a battery management system; the relay, controlled by the battery management system, provides an external short-circuit environment for the power battery pack to be heated, under normal conditions In the disconnected state, when the power battery pack to be heated requires an external short-circuit environment, the relay is in the closed state; the battery management system controls the power battery pack to be heated to start heating or stop heating; the present invention first obtains the duration of the external short circuit through an experimental method, and sets The short-circuit duration is controlled within a reasonable threshold to ensure safety, and the short-circuit current caused by an external short-circuit is used to generate heat to heat the battery. Experiments show that this method is much higher than the low-temperature heating rate of the existing battery thermal management system, and the method is simple and easy to implement. It effectively solves the problems of reduced capacity and worsened work performance of electric vehicle power batteries in severe cold environments.
Description
technical field [0001] The invention belongs to the technical field of electric vehicle power batteries, and in particular relates to a power battery low-temperature self-heating system and method based on an instantaneous external short circuit. Background technique [0002] New energy vehicles represented by electric vehicles have become the main development trend in the automotive field. As an on-board electric energy storage unit, the performance of lithium-ion power batteries has the most direct impact on the performance of electric vehicles. However, lithium-ion power batteries The performance of the battery is greatly affected by temperature, especially at low temperature, the charge and discharge performance of the battery drops sharply, the capacity decline is very obvious, and even charge and discharge cannot be performed when the temperature is too low. In winter in Northeast my country, the temperature can often reach below -20°C. In order to enable the applicati...
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IPC IPC(8): H01M10/615H01M10/625H01M10/63H01M10/635H01M10/6571
CPCH01M10/615H01M10/625H01M10/63H01M10/635H01M10/6571Y02E60/10
Inventor 陈泽宇王永富劳孟潇任毅蔡雪吴润宇高子聪
Owner NORTHEASTERN UNIV LIAONING