Power regulation and control method of power battery thermal management equipment

Abstract

The invention provides a power regulation and control method for power battery thermal management equipment, which comprises a thermal management system, and the input of the thermal management system comprises the target working temperature of the battery management system and the temperature sensing temperature actually acquired by a battery pack. Refrigeration and heating of the thermal management system are judged according to the difference value S between the temperature sensing temperature actually collected by the battery pack and the target working temperature of the battery management system, and then a thermal management equipment power control signal in a percentage form is output. According to the power regulation and control method of the power battery thermal management equipment, the stability of the temperature regulation and control change rate of the battery thermal management system is improved, the damage degree of too fast temperature rise or temperature drop to the performance and the service life of the battery is greatly reduced, and the power consumption of the thermal management system is obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles and energy storage equipment, and in particular to a power control method for power battery thermal management equipment. Background Art

[0002] With the widespread use of electric vehicles (EVs) and energy storage systems, the performance and safety of power batteries have become particularly important. Power batteries generate a lot of heat during operation, and excessively high or low temperatures will affect the charging and discharging efficiency and service life of the battery. Specifically, existing thermal management systems usually use air cooling or liquid cooling technology to maintain the temperature range of the battery through constant cooling power. However, these methods have some defects, such as the adjustment of cooling power is not flexible enough, and it is impossible to dynamically adjust it in real time according to the actual working state of the battery (such as temperature, power demand, etc.), resulting in energy waste or inaccurate temperature management, affecting the overall efficiency and safety of the battery. Summary of the invention

[0003] In view of the above technical problems, the present invention proposes a power regulation method for a power battery thermal management device, which achieves optimal temperature control management of the battery pack by intelligently adjusting power distribution to improve battery performance and extend battery life.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a power regulation method for a power battery thermal management device, comprising a thermal management system, wherein the input of the thermal management system comprises a target operating temperature of a battery management system and a temperature sensing temperature actually collected by a battery pack, and the cooling and heating of the thermal management system is determined by the difference S between the temperature sensing temperature actually collected by the battery pack and the target operating temperature of the battery management system, and then a power control signal of the thermal management device in the form of a percentage is output.

[0006] Furthermore, if the difference S between the actually collected temperature of the battery pack and the target operating temperature of the battery management system is greater than 0, the thermal management system needs to be cooled; if the difference S between the actually collected temperature of the battery pack and the target operating temperature of the battery management system is less than 0, the thermal management system needs to be heated.

[0007] Furthermore, the actual collected temperature at the current moment is Ty k , the actual temperature collected at the last moment is Ty k+1 , the actual temperature collected at the last moment is Ty k-2 ; The temperature change at the current moment is ΔT k =Ty k -Ty k-1 , the temperature change at the last moment is ΔT k-1 =Tyk-1 -Ty k-2 The temperature change rate is The initial temperature change rate is 1, the target temperature change rate is OT, and the target temperature change rate is a fixed constant. Different values ​​can be set according to the test results of different battery packs to achieve the optimal control effect. At the current moment, P is P k , the last moment P is P k-1 .

[0008] The power control method of the power battery thermal management device of the present invention monitors the battery status in real time, and intelligently adjusts the power output of the thermal management system according to information such as the battery's operating temperature, load demand, and environmental factors, to achieve precise temperature control management of the battery, thereby improving battery performance, optimizing energy efficiency, and extending battery life. The power control method of the power battery thermal management device of the present invention improves the stability of the temperature control change rate of the battery thermal management system, greatly reduces the degree of damage to battery performance and life caused by excessively rapid heating or cooling, and significantly reduces the power consumption of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a relationship diagram between the initial state P output and Sa of the power control method of the power battery thermal management device of the present invention. DETAILED DESCRIPTION

[0010] See also Figure 1 The present invention provides a power control method for a power battery thermal management device, including a thermal management system input, wherein the thermal management system input includes a target operating temperature of the battery management system (represented by Tx) and a temperature sensing temperature actually collected by a battery pack (represented by Ty), and the difference S between the temperature sensing temperature actually collected by the battery pack and the target operating temperature of the battery management system is used to determine cooling and heating of the thermal management system, and then outputs a thermal management device power control signal P in the form of a percentage.

[0011] In one embodiment, if the difference S between the actually collected temperature of the battery pack and the target operating temperature of the battery management system is greater than 0, cooling is required; if the difference S between the actually collected temperature of the battery pack and the target operating temperature of the battery management system is less than 0, heating is required. The difference between Ty and Tx is expressed by S=Ty-Tx, and the absolute value of S is taken (expressed as Sa).

[0012] In one embodiment, the actual collected temperature at the current moment is Ty k , the actual temperature collected at the last moment is Ty k-1 , the actual temperature collected at the last moment is Ty k-2 ; The temperature change at the current moment is ΔT k =Ty k -Ty k-1, the temperature change at the last moment is ΔT k-1 =Ty k-1 -Ty k-2 The temperature change rate is The initial temperature change rate is 1, the target temperature change rate is OT, and the target temperature change rate is a fixed constant. Different values ​​can be set according to the test results of different battery packs to achieve the optimal control effect. At the current moment, P is P k , the last moment P is P k-1 , the thermal management output at the current moment is realized by combining the actual acquisition temperature change rate with the thermal management historical output value.

[0013] Specifically, the output P at two consecutive moments after the initial state is determined by the absolute value of the temperature difference Sa. The relationship between P output and Sa is as follows: Figure 1 As shown. The output P after two consecutive moments of the initial state k Use the following relationship:

[0014] When S=0, P=0.001

[0015] When S>0, if ΔT k >0,P k =2*P k-1

[0016] If ΔT k <0, if |ΔdT|>OT,

[0017] If |ΔdT| <OT,P k =P k-1 *(1+OT-|ΔdT|)

[0018] When S<0, if ΔT k <0, P k =2*P k-1

[0019] If ΔT k >0, if |ΔdT|>OT,

[0020] If |ΔdT| <OT,P k =P k-1 *(1+OT-|ΔdT|)

[0021] If P=0 during the calculation process, the P value is forcibly set to 0.001. If P is greater than 1, the P value is forcibly set to 1.

[0022] For specific thermal management control operation calculation examples, please refer to the following table:

[0023]

[0024] The power control method of the power battery thermal management device of the present invention monitors the battery status in real time, and intelligently adjusts the power output of the thermal management system according to information such as the battery's operating temperature, load demand, and environmental factors, to achieve precise temperature control management of the battery, thereby improving battery performance, optimizing energy efficiency, and extending battery life. The power control method of the power battery thermal management device of the present invention improves the stability of the temperature control change rate of the battery thermal management system, greatly reduces the degree of damage to battery performance and life caused by excessively rapid heating or cooling, and significantly reduces the power consumption of the thermal management system.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power control method for a power battery thermal management device, characterized in that: It includes a thermal management system, the input of which includes the target operating temperature of the battery management system and the temperature sense temperature actually collected by the battery pack. The cooling and heating of the thermal management system is determined by the difference S between the temperature sense temperature actually collected by the battery pack and the target operating temperature of the battery management system, and the power control signal of the thermal management device is output in percentage form.

2. The power control method of the power battery thermal management device according to claim 1, characterized in that: If the difference S between the temperature actually collected by the battery pack and the target operating temperature of the battery management system is greater than 0, the thermal management system needs to be cooled; if the difference S between the temperature actually collected by the battery pack and the target operating temperature of the battery management system is less than 0, the thermal management system needs to be heated.

3. The power control method of the power battery thermal management device according to claim 1, characterized in that: The actual collected temperature of the thermal management system at the current moment is Ty k , the actual temperature collected at the last moment is Ty k-1 , the actual temperature collected at the last moment is Ty k-2 ; The temperature change at the current moment is ΔT k =Ty k -Ty k-1 , the temperature change at the last moment is ΔT k-1 =Ty k-1 -Ty k-2 The temperature change rate is The initial temperature change rate is 1, the target temperature change rate is 0T, and the target temperature change rate is a fixed constant. Different values ​​can be set according to the test results of different battery packs to achieve the optimal control effect. At the current moment, P is P k , the last moment P is P k-1 .

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