Method of quickly heating and maintaining constant temperature for lithium-ion battery pack at extremely low temperature
A battery pack and rapid heating technology, applied in the direction of temperature control using electric methods, electric controllers, controllers with specific characteristics, etc., can solve problems such as poor stability, poor temperature stability, and poor performance , to achieve the effect of improving stability and reliability, remarkable application effect and reasonable design
Active Publication Date: 2017-05-31
天津蓝天特种电源科技股份公司
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Problems solved by technology
[0002] At present, lithium-ion battery packs have been widely used in aviation, aerospace, power and other fields, but lithium-ion battery packs often have defects such as poor performance and poor stability under extreme low temperature conditions.
Nowadays, the solution to heating lithium-ion battery packs under extremely low temperature conditions is to use heating film for heating, but the heating film cannot be heated quickly under the mainstream solution. After heating, the internal temperature fluctuation of the battery pack will greatly increase, making the lithium-ion battery pack Poor internal temperature stability will seriously affect the stability and reliability of lithium-ion battery pack performance
[0003] Therefore, in order to change the current situation that lithium-ion battery packs operate poorly under extremely low-temperature conditions, and provide a method for rapidly heating lithium-ion battery packs at extremely low temperatures and maintaining a constant temperature, it will be one of the problems to be solved urgently by those skilled in the art
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[0013] Below in conjunction with the accompanying drawings, the specific implementation methods and features provided according to the present invention are described in detail as follows:
[0014] A method for rapidly heating and maintaining a constant temperature of a lithium-ion battery pack at an extremely low temperature, the specific implementation steps of the method are as follows:
[0015] (1) The electrothermal polyimide (PI) heating film, battery pack insulation layer, and internal temperature monitoring BMS (battery management system) are used to form the configuration; the PI heating film must ensure that the insulation resistance is greater than 500MΩ, and the surface air temperature is less than 60 ℃; the electrothermal polyimide (PI) heating film has the characteristics of high power density and low power attenuation;
[0016] (2) When the internal temperature of the battery pack drops below 0°C, the BMS of the battery pack turns on the heating circuit. At this...
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The invention relates to a method of quickly heating and maintaining constant temperature for a lithium-ion battery pack at extremely low temperature; the method comprises the steps of (1) using the compositional configuration of electrothermal polyimide heating film, a battery pack insulation layer and an interior temperature monitoring BMS (battery management system); (2) when the interior temperature of the battery pack drops to 0 DEG C and below, starting a heating loop by the battery pack BMS, and breaking a charge-discharge loop while the battery pack is heatable; after an operator starts a heating command, allowing the heating film to start heating under the action of an external power source, with interior temperature of the battery pack increasing linearly and reaching about 10 DEG C in 15 min, and determining that the BMS automatically starts a constant temperature mode at the time; (3) using PID (proportional-integral-derivative) algorithm to perform proportional, derivative and integral operation adjustment; (4) covering the battery pack with the insulation layer to ensure temperature rise speed. The method provides quick heating and constant temperature maintaining for a lithium-ion battery pack under extremely low temperature, and is reasonable in design, easy to implement and significant in effect.
Description
technical field [0001] The invention relates to a method for rapidly heating and maintaining a constant temperature of a lithium-ion battery pack, in particular to a method for rapidly heating and maintaining a constant temperature of a lithium-ion battery pack at extremely low temperatures. Background technique [0002] At present, lithium-ion battery packs have been widely used in various fields such as aviation, aerospace, power, etc., but lithium-ion battery packs often have defects such as poor performance and poor stability under extreme low temperature conditions. Nowadays, the solution to heating lithium-ion battery packs under extremely low temperature conditions is to use heating film for heating, but the heating film cannot be heated quickly under the mainstream solution. After heating, the internal temperature fluctuation of the battery pack will greatly increase, making the lithium-ion battery pack The poor stability of the internal temperature will seriously af...
Claims
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IPC IPC(8): G05B11/42G05D23/19
CPCG05B11/42G05D23/19
Inventor 张明哲陈思渊金晶龙
Owner 天津蓝天特种电源科技股份公司