CN108878995B - Method and device for determining battery pack temperature difference of new energy vehicle and control method - Google Patents

Method and device for determining battery pack temperature difference of new energy vehicle and control method Download PDF

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Publication number
CN108878995B
CN108878995B CN201810371214.8A CN201810371214A CN108878995B CN 108878995 B CN108878995 B CN 108878995B CN 201810371214 A CN201810371214 A CN 201810371214A CN 108878995 B CN108878995 B CN 108878995B
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temperature difference
command
battery pack
detection values
reversing
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CN108878995A (en
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陆群
张宇
刘天鸣
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Beijing Changcheng Huaguan Automobile Technology Development Co Ltd
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Beijing Changcheng Huaguan Automobile Technology Development Co Ltd
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Priority to PCT/CN2018/114542 priority patent/WO2019205572A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The embodiment of the invention discloses a method, a device and a control method for determining battery pack temperature difference of a new energy vehicle. The method comprises the following steps: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discarding process, calculating a first standard deviation based on the first mean value, and performing an additional process on the detection values remaining after the first discarding process, the additional process including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of a first standard deviation; and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the temperature difference of the battery pack. The measured value of the sensor fault is eliminated by utilizing the statistical parameters, and the accuracy of the temperature difference is improved.

Description

Method and device for determining battery pack temperature difference of new energy vehicle and control method
Technical Field
The invention relates to the technical field of automobiles, in particular to a method, a device and a control method for determining battery pack temperature difference of a new energy vehicle.
Background
The shortage of energy, the petroleum crisis and the environmental pollution are getting more and more severe, which brings great influence to the life of people and is directly related to the sustainable development of national economy and society. New energy technologies are actively developed in all countries of the world. A new energy automobile which reduces the oil consumption, has low pollution and low noise is regarded as an important way for solving the energy crisis and the environmental deterioration.
The new energy automobile adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and forms an automobile with advanced technical principle, new technology and new structure. New energy vehicles generally include four major types, Hybrid Electric Vehicles (HEV), pure electric vehicles (BEV), Fuel Cell Electric Vehicles (FCEV), and other new energy vehicles (e.g., super capacitors, flywheels, and other high-efficiency energy storage vehicles).
In a new energy automobile, a power battery drives a motor to generate power, so the performance and the service life of the power battery are key factors influencing the performance of the automobile. Because the space on the vehicle is limited, a large amount of heat generated by the battery in the working process is accumulated under the influence of the space, so that the temperature is uneven at each position to influence the consistency of the battery monomer, thereby reducing the charge-discharge cycle efficiency of the battery, influencing the power and energy exertion of the battery, causing thermal runaway in severe cases and influencing the safety and reliability of the system. In order to make the power battery perform the best performance and have the best service life, the structure of the battery pack needs to be optimized, a thermal management system is adopted to keep the temperature of the battery in a proper range, and the temperature balance of all parts of the battery is ensured. The heat management system provides cooling liquid for each battery pack water chamber through a system pipeline to realize heat dissipation and refrigeration of the battery packs.
In the prior art, temperature data at various places are obtained by temperature sensors arranged at various places of a battery pack, and a maximum value T is found therein from the obtained raw temperature datamaxAnd a minimum value TminAnd subtracting the temperature difference to obtain the temperature difference of the battery pack. When the maximum value TmaxAnd a minimum value TminWhen a certain fixed threshold value is exceeded, the system considers that the data is wrong and discards the data so as to ensure the accuracy of temperature difference calculation.
However, although the existing scheme avoids temperature measurement errors caused by sensor failure, errors caused by the sensor cannot be judged, and therefore the accuracy of temperature difference calculation is reduced.
Disclosure of Invention
The invention aims to provide a method, a device and a control method for determining battery pack temperature difference of a new energy vehicle, so that the accuracy of temperature difference calculation is improved.
The embodiment of the invention comprises the following steps:
a method of determining a battery pack temperature differential for a new energy vehicle, comprising:
arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack;
receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value;
calculating a first mean value of the detection values remaining after the first discard processing, calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation;
and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the battery pack temperature difference.
In one embodiment, after performing the second discarding process, the additional process further comprises:
calculating a second mean value of the detection values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and performing a third discarding process on the detection values remaining after the second discarding process, the third discarding process including: discarding detection values having an absolute value of a difference from the second mean value larger than a predetermined multiple of the second standard deviation.
In one embodiment, the predetermined multiple is 3.
An apparatus for determining a battery pack temperature difference of a new energy vehicle, comprising:
a reception module configured to receive detection values provided by a plurality of temperature sensors arranged at a plurality of predetermined positions of the battery pack, respectively, and to perform a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value;
a calculation module configured to calculate a first mean value of detection values remaining after a first discard processing, calculate a first standard deviation based on the first mean value, and perform additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation;
and the determining module is used for determining the difference between the maximum value and the minimum value in the detection values left after the additional processing as the temperature difference of the battery pack.
In one embodiment, the calculation module is configured to further calculate a second average value of the detection values remaining after the second discarding process is performed, calculate a second standard deviation based on the second average value, and perform a third discarding process on the detection values remaining after the second discarding process, where the third discarding process includes: discarding detection values having an absolute value of a difference from the second mean value larger than a predetermined multiple of the second standard deviation.
A control method of a series thermal management pipeline of a new energy vehicle comprises the following steps: a water pump; the water inlet of the heating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and all pipelines of all water chambers for heating all the batteries in the battery pack are mutually connected in series; the reversing valve is connected with the water outlet of the heating element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the method comprises the following steps:
detecting a temperature differential of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; determining a difference between a maximum value and a minimum value among the detection values remaining after the additional processing as the temperature difference;
the reversing valve controller generates a hold command or a reverse command based on a comparison of the temperature difference to a predetermined temperature difference threshold value;
the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
In one embodiment, the diverter valve controller generating a hold command or a divert command based on a comparison of the temperature difference to a predetermined temperature difference threshold value comprises:
when the temperature difference is greater than the predetermined temperature difference threshold value, the reversing valve controller generates the reversing command and continuously generates a hold command within a predetermined time after the reversing command is generated.
In one embodiment, after changing the direction of the water path to flow from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises:
when the temperature difference changes from decreasing to increasing, and when the temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command;
the reversing valve switches a water path direction from the first coolant interface to the second coolant interface based on the second reversing command.
A control method of a series thermal management pipeline of a new energy vehicle comprises the following steps: a water pump; the water inlet of the refrigerating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and pipelines of water chambers for cooling the batteries in the battery pack are connected in series; the reversing valve is connected with the water outlet of the refrigeration element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the method comprises the following steps:
detecting a temperature differential of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, and executing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, and calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; determining a difference between a maximum value and a minimum value among the detection values remaining after the additional processing as the temperature difference;
the reversing valve controller generates a hold command or a reverse command based on a comparison of the temperature difference to a predetermined temperature difference threshold value;
the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
In one embodiment, the diverter valve controller generating a hold command or a divert command based on a comparison of the temperature difference to a predetermined temperature difference threshold value comprises: when the temperature difference is larger than the preset temperature difference threshold value, the reversing valve controller generates a reversing command and continuously generates a holding command within a preset time after the reversing command is generated;
after changing the direction of the water path from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises:
when the temperature difference changes from decreasing to increasing, and when the temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command;
the reversing valve switches a water path direction from the first coolant interface to the second coolant interface based on the second reversing command.
As can be seen from the above technical solutions, in the embodiment of the present invention, a plurality of temperature sensors are arranged at a plurality of predetermined positions of a battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discarding process, calculating a first standard deviation based on the first mean value, and performing an additional process on the detection values remaining after the first discarding process, the additional process including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of a first standard deviation; and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the temperature difference of the battery pack. The measured value of the sensor fault is eliminated by utilizing the statistical parameters, and the accuracy of the temperature difference is improved.
In addition, the embodiment of the invention realizes a pipeline scheme of a serial heat management system, and ensures the flow uniformity.
In addition, the embodiment of the invention controls the flow direction of the serial water paths by using the reversing valve, thereby reducing the temperature difference of the battery system.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a flowchart of a method of determining a pack temperature difference of a new energy vehicle according to the present invention.
Fig. 2 is a structural view of an apparatus for determining a temperature difference of a battery pack of a new energy vehicle according to the present invention.
Fig. 3 is a first exemplary block diagram of a series thermal management system of a new energy vehicle according to the present invention.
Fig. 4 is a schematic view of a thermal management water circuit after the reversing operation of the reversing valve in fig. 3 is performed.
Fig. 5 is a schematic diagram of a first control flow of the series thermal management system of the new energy vehicle according to the invention.
Fig. 6 is a second exemplary block diagram of a series thermal management system of a new energy vehicle according to the present invention.
Fig. 7 is a schematic view of a thermal management water circuit after the reversing operation of the reversing valve in fig. 6 is performed.
Fig. 8 is a schematic diagram of a second control flow of the series thermal management system of the new energy vehicle according to the invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
The embodiment of the invention provides a temperature difference (namely temperature difference) calculation method capable of spontaneously eliminating the error of a temperature sensor, and the influence of the error of the temperature sensor on the temperature difference value to be output by a system is reduced. In an embodiment of the present invention, the dynamic error limit for the current state of the system is calculated using statistical parameters and discarded when the temperature sensor measurements exceed the dynamic threshold and likewise discarded when the temperature sensor measurements exceed the determined threshold.
Fig. 1 is a flowchart of a method of determining a pack temperature difference of a new energy vehicle according to the present invention.
As shown in fig. 1, the method includes:
step 101: a plurality of temperature sensors are arranged at a plurality of predetermined positions of the battery pack.
Step 102: receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values above a first predetermined threshold or below a second predetermined threshold.
Step 103: calculating a first mean value of the detection values remaining after the first discard processing, calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: a second discarding process of discarding a detection value whose absolute value of the difference from the first mean value is larger than a predetermined multiple of the first standard deviation is performed.
Step 104: and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the battery pack temperature difference.
In one embodiment, after performing the second discarding process, the additional process further comprises: calculating a second mean value of the detection values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and performing a third discarding process on the detection values remaining after the second discarding process, the third discarding process including: discarding detection values having an absolute value of a difference from the second mean value larger than a predetermined multiple of the second standard deviation. Preferably, the predetermined multiple is 3.
The following describes embodiments of the present invention with reference to specific formulas and mathematical definitions.
Assuming that there are N sensors arranged in the battery pack, the measured temperature values are: t1, T2, … … TN. Tn is used herein to refer to the measurement of any one of the sensors.
Calculating the temperature difference of the battery pack by the following process:
the first step is as follows: discarding the measurements that exceed a determined threshold:
when Tn is greater than Tb0 or Tn < Ta0, discarding Tn; both Tb0 and Ta0 herein are threshold values determined based on predetermined empirical values, with an excessive temperature value being screened out by comparison with Tb0 and an excessive temperature value being screened out by comparison with Ta 0.
Assuming that x measurements are discarded, the remaining temperature values are:
Ta1，Ta2，……，Ta(N-x)；
the second step is that: calculating the system mean value mu after the primary processingaWherein:
the third step: calculating the initial standard deviation sigma of the systemaWherein:
the fourth step: measurements exceeding 3 times the standard deviation were discarded:
specifically, when | Tan- μa|>3σaThen, Tan is discarded, assuming that y measurements are discarded, and the remaining temperature values are:
Tb1，Tb2，……，Tb(N-x-y)；
fifthly, calculating the system mean value mu after the secondary treatmentbWherein:
and a sixth step: quadratic calculation of system standard deviation sigmabDefining 3 times of standard deviation as a dynamic error limit of the system; wherein:
the seventh step: discarding more than 3 standard deviations (i.e., 3 σ)b) Is measured.
When | Tbn-mub|>3σbWhen Tbn is discarded, assuming that z measurements are discarded, the remaining temperature values are:
Tc1，Tc2，……，Tc(N-x-y-z)；
eighth step: sorting Tc1, Tc2, … …, Tc (N-x-y-z) to obtain the maximum TcmaxAnd minimum value TcminAnd subtracting the temperature difference value delta T of the battery pack from the temperature difference value delta T of the battery pack, wherein:
ΔT＝Tcmax-Tcmin
therefore, the error limit of the system in the current state is calculated by using the statistical parameters, the measured value of the sensor with the fault can be automatically eliminated, and the correctness of the calculated system temperature difference is ensured.
Based on the above description, the embodiment of the invention also provides a device for determining the temperature difference of the battery pack of the new energy vehicle.
Fig. 2 is a structural view of an apparatus for determining a temperature difference of a battery pack of a new energy vehicle according to the present invention.
As shown in fig. 2, the apparatus includes:
a receiving module 201 configured to receive detection values provided by a plurality of temperature sensors arranged at a plurality of predetermined positions of a battery pack, and perform a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value;
a calculating module 202, configured to calculate a first mean value of the detection values remaining after the first discarding process, calculate a first standard deviation based on the first mean value, and perform additional processing on the detection values remaining after the first discarding process, where the additional processing includes: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation;
a determining module 203, configured to determine a difference between a maximum value and a minimum value of the detection values remaining after the additional processing as the battery pack temperature difference.
In one embodiment, the calculating module 202 is configured to further calculate a second average value of the detection values remaining after the second discarding process is performed, calculate a second standard deviation based on the second average value, and perform a third discarding process on the detection values remaining after the second discarding process, where the third discarding process includes: discarding detection values having an absolute value of a difference from the second mean value larger than a predetermined multiple of the second standard deviation.
The method for determining the battery pack temperature difference of the new energy vehicle, which is provided by the embodiment of the invention, can be applied to various thermal management examples.
In addition, the applicant found that: the heat management system of the current new energy vehicle usually adopts the cooling system that connects in parallel, hardly guarantees flow uniformity, and flow uniformity can be destroyed along with reasons such as system pipeline bending, oppression or inside scale deposit in the in-service use moreover.
In addition, the applicant has also found that: at present, the flow direction of liquid inside the existing serial pipeline scheme cannot be changed, so that the battery module using the existing serial heat management system scheme is difficult to effectively control the internal temperature difference, and the temperature difference is overlarge. Under extreme conditions, because the temperature is different everywhere in the pipeline, the original difference in temperature of battery system can even be increased to the thermal management system, causes the harmful effects to the temperature uniformity of battery system.
The embodiment of the invention provides a new energy vehicle series connection type thermal management system, which solves the problem of flow non-uniformity of a parallel cooling system.
In addition, in the embodiment of the invention, when the battery thermal management system needs to work, the flow direction of the pipeline is adjusted by the reversing valve according to the temperature difference change of each part of the pipeline, so that the purpose of reducing the temperature difference inside the battery is realized.
Fig. 3 is a first exemplary block diagram of a series thermal management system of a new energy vehicle according to the present invention.
As shown in fig. 3, the system includes:
a water pump P1;
a heating element; the water inlet of the heating element is connected with the water outlet of the water pump P1 in series;
a battery pack including a plurality of batteries, including a first coolant port K disposed at a first side of the battery pack and a second coolant port M disposed at an opposite side of the first side; the pipelines of the water chambers in the battery pack, which are used for heating the batteries, are connected in series with each other (for example, in fig. 3, the pipelines of the water chamber 1, the water chamber 2 and the water chamber n are connected in series with each other, wherein the water chamber 1 is connected with the first cooling liquid interface K, the water chamber n is connected with the second cooling liquid interface M, and n is the number of the batteries);
the reversing valve V1 is respectively connected with the water outlet of the heating element, the water return port of the water pump P1, the first cooling liquid interface K and the second cooling liquid interface M;
a temperature difference detecting element for detecting a battery temperature difference between a battery located on a first side and a battery located on an opposite side in the battery pack;
a reversing valve controller for generating a hold command or a reversing command based on a comparison of the battery temperature difference with a predetermined temperature difference threshold value;
wherein the directional control valve maintains the water path direction from the first coolant port K to the second coolant port M based on the hold command and switches the water path direction from the second coolant port M to the first coolant port K based on the directional control command.
Therefore, the battery pack comprises a plurality of batteries, and pipelines in the battery pack, which are used for heating water chambers of the batteries, are connected in series, so that the series-type thermal management system of the new energy vehicle is realized, and the problem of non-uniformity of flow of a parallel cooling system can be solved.
In one embodiment, the directional valve V1 may be implemented as a solenoid directional valve, a motorized directional valve, an electro-hydraulic directional valve, or a manual directional valve, among others.
Preferably, the directional valve V1 is implemented as a two-position four-way solenoid directional valve, a two-position six-way solenoid directional valve, a three-position four-way solenoid directional valve, or a three-position six-way solenoid directional valve, among others.
While specific examples of reversing valves are shown above for illustration, those skilled in the art will appreciate that this description is by way of example only, and is not intended to limit the scope of embodiments of the present invention.
In one embodiment, the reversing valve controller is configured to generate a hold command when the battery temperature difference is less than or equal to a predetermined temperature difference threshold, generate a reverse command when the battery temperature difference is greater than the predetermined temperature difference threshold, and continue to generate the hold command for a predetermined time after the reverse command is generated. Thus, by continuing to generate the hold command for a predetermined time after the generation of the reverse command, frequent switching of the reversing valve can be prevented.
Preferably, after switching the water path direction from the second coolant connection M to the first coolant connection K on the basis of the switching command, the switching valve controller generates a second switching command when the battery temperature difference changes to decrease and then increase and when the battery temperature difference is again greater than the predetermined temperature difference threshold value, and the switching valve switches the water path direction from the first coolant connection K to the second coolant connection M on the basis of the second switching command.
Preferably, the heating element may be embodied as a PTC heater. When the heating element is embodied as a PTC heater, the battery water path of the new energy vehicle shown in fig. 1 includes a P1 water pump, the heating element, a reversing valve V1, a battery pack, and a pipeline, wherein the battery pack includes a plurality of batteries, and the pipelines of the battery packs for heating the water chambers of the batteries are connected in series. At this time, the working process is as follows:
at the initial moment of the startup of the thermal management system, the water pump P1 and the PTC heater are operated while the reversing valve V1 maintains the initial state, and the thermal management system can provide heat to the battery pack. At this time, the flow sequence of the cooling liquid is shown in fig. 1, specifically: the water outlet of the water pump P1 → the PTC heater → the port a of the selector valve V1 → the port C of the selector valve V1 → the first coolant port K of the battery pack → the second coolant port M of the battery pack → the port D of the selector valve V1 → the port B of the selector valve V1 → the water return port of the water pump P1. In the configuration shown in fig. 1, the coolant is first heated in the PTC heater and then flows through the first coolant connection K of the battery pack and then through the second coolant connection M of the battery pack. That is, the battery on the first coolant connection K side of the battery pack is heated first, and then the battery on the second coolant connection M side of the battery pack is heated. After heating for a period of time, due to the nonuniformity of the internal temperature of the series pipeline, the temperature nonuniformity also occurs in the battery pack, which is represented by that the temperature near the water inlet of the battery pack is high and the temperature near the water outlet of the battery pack is low, namely, the temperature of the battery on the side of the first cooling liquid interface K is relatively high, and the temperature of the battery on the side of the second cooling liquid interface M is relatively low.
The temperature difference detection element continuously detects a battery temperature difference in the battery pack. The battery temperature difference can be understood to be an absolute value. When the battery temperature difference (temperature difference for short) detected by the temperature difference detection element is less than or equal to a preset threshold value a, the reversing valve controller generates a holding command, and the reversing valve does not execute reversing operation. When the temperature difference detected by the temperature difference detection element is larger than a preset threshold value a, the reversing valve controller generates a reversing command, and the reversing valve V1 is reversed to enable the water inlet and the water outlet of the battery pack to be interchanged.
The specific process of the temperature difference detection element continuously detecting the temperature difference of the battery in the battery pack includes: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the temperature difference. Preferably, after the second discarding process is performed, the additional process further includes: calculating a second mean value of the detection values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and performing a third discarding process on the detection values remaining after the second discarding process, the third discarding process including: discarding detection values having an absolute value of a difference from the second mean value larger than a predetermined multiple of the second standard deviation.
Fig. 4 is a schematic view of a thermal management water circuit after the reversing operation of the reversing valve in fig. 3 is performed.
As can be seen from fig. 4, after the reversing operation is performed, the flow order of the cooling liquid is adjusted to: the water outlet of the water pump P1 → the heating element (such as a PTC heater) → the port a of the selector valve V1 → the port D of the selector valve V1 → the second coolant port M of the battery pack → the first coolant port K of the battery pack → the port C of the selector valve V1 → the port B of the selector valve V1 → the water return port of the water pump P1. At this time, the coolant is first heated in the PTC heater, and then flows through the second coolant port M of the battery pack and then flows through the first coolant port K of the battery pack. That is, the battery on the side of the second coolant connection M of the battery pack is heated first, and then the battery on the side of the first coolant connection K of the battery pack is heated. After heating for a period of time, due to the non-uniformity of the internal temperature of the serial pipeline, after the operation for a period of time, the temperature difference of the battery inside the battery pack is reduced (namely, the battery temperature on the side of the first cooling liquid interface K is gradually close to the battery temperature on the side of the second cooling liquid interface M), and the operation is continued in the state shown in fig. 4. Then, the temperature difference becomes zero, that is, the battery temperature on the side of the first cooling liquid interface K is the same as the battery temperature on the side of the second cooling liquid interface M, at this time, the operation is continued by keeping the state, the temperature difference is increased again from zero (the battery temperature on the side of the second cooling liquid interface M gradually starts to be higher than the battery temperature on the side of the first cooling liquid interface M), when the temperature difference reaches a value larger than a specific threshold value a, the reversing operation is executed again, and so on until the thermal management system is closed.
Based on the description, the embodiment of the invention provides a control method for a series-type heat management pipeline of a new energy vehicle. The thermal management pipeline comprises: a water pump; the water inlet of the heating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and pipelines of water chambers in the battery pack for heating the batteries are connected in series; the reversing valve is respectively connected with the water outlet of the heating element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface; the method comprises the following steps:
the first step is as follows: the temperature difference detection element detects a battery temperature difference of the battery pack. The specific detection mode can refer to the method flow shown in fig. 1.
The second step is that: the reversing valve controller generates a hold command or a reversing command based on a comparison of the battery temperature difference and a predetermined temperature difference threshold value;
the third step: the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
In one embodiment, the reversing valve controller generating the hold command or the reversing command based on a comparison of the battery temperature difference to a predetermined temperature difference threshold comprises: the diverter valve controller generates a hold command when the battery temperature difference is less than or equal to a predetermined temperature difference threshold value.
In one embodiment, the reversing valve controller generating the hold command or the reversing command based on a comparison of the battery temperature difference to a predetermined temperature difference threshold comprises: when the battery temperature difference is greater than the predetermined temperature difference threshold value, the reversing valve controller generates a reversing command and continuously generates a holding command within a predetermined time after the reversing command is generated.
In one embodiment, after reversing the direction of the water path to flow from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises: when the battery temperature difference changes from decreasing to increasing, and when the battery temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command; the reversing valve switches the direction of the water path from the first coolant port to the second coolant port based on a second reversing command.
Fig. 5 is a schematic diagram of a first control flow of the series thermal management system of the new energy vehicle according to the invention.
The flow shown in fig. 5 may apply the handover procedure as shown in fig. 3 and 4. The heating element may be embodied as a PTC heater.
As shown in fig. 5, the method includes:
step 501: the temperature T of the battery pack is detected, for example, the temperature T may be an average temperature of the battery pack.
Step 502: when the temperature T of the battery pack is greater than the predetermined threshold value a, it may be determined that the heating process is not to be performed for the battery pack, and step 508 and the subsequent steps are performed at this time; when the temperature T of the battery pack is less than or equal to the predetermined threshold value a, it may be determined that the heating process needs to be performed for the battery pack, at which time step 503 and the subsequent steps are performed.
Step 503: the water pump P1 is turned on and the PTC heater is activated. At this time, the water pump P1 and the PTC heater are operated while the reversing valve V1 remains in the initial state, and the thermal management system can provide heat to the battery pack. At this time, the flow order of the coolant is the water outlet of the water pump P1 → the PTC heater → the a port of the selector valve V1 → the C port of the selector valve V1 → the first coolant port K of the battery pack → the second coolant port M of the battery pack → the D port of the selector valve V1 → the B port of the selector valve V1 → the water return port of the water pump P1. The coolant is first heated in the PTC heater and then flows through the first coolant connection K of the battery pack and then through the second coolant connection M of the battery pack. That is, the battery on the side of the first cooling fluid port K of the battery pack is heated first, and then the battery on the side of the second cooling fluid port M of the battery pack is heated. After heating for a period of time, due to the nonuniformity of the internal temperature of the series pipeline, the temperature nonuniformity also appears in the battery pack, which is represented by that the temperature near the water inlet of the battery pack is high and the temperature near the water outlet of the battery pack is low, namely, the temperature of the battery on the side of the first cooling liquid interface K is high, and the temperature of the battery on the side of the second cooling liquid interface M is low.
Step 504: the temperature difference detection element continuously detects the battery temperature difference dT of the battery pack (for example, detects the battery temperature difference between the battery closest to the first coolant port K and the battery closest to the second coolant port). Here, the battery temperature difference dT is understood to be an absolute value. The specific way of detecting the temperature difference of the temperature difference detecting element can refer to the flow chart shown in fig. 1.
Step 505: when the temperature difference dT detected by the temperature difference detecting element is smaller than a predetermined threshold value B, the directional valve controller generates a hold command and performs step 507: when the temperature difference dT detected by the temperature difference detection element is greater than or equal to a preset threshold value a, the reversing valve controller generates a reversing command and executes the step 506;
step 506: the reversing valve V1 reverses based on the reversing command to interchange the battery pack inlet and outlet ports. That is, the flow order of the coolant is the water outlet port of the water pump P1 → the PTC heater → the a port of the selector valve V1 → the D port of the selector valve V1 → the second coolant port M of the battery pack → the first coolant port K of the battery pack → the C port of the selector valve V1 → the B port of the selector valve V1 → the water return port of the water pump P1. Then, the process returns to step 501.
Step 507: the direction change valve V1 does not perform the direction change operation based on the hold command, and the direction of the coolant is maintained in the direction of V1, i.e., the flow sequence of the coolant is still the water outlet of the water pump P1 → the PTC heater → the a port of the direction change valve V1 → the C port of the direction change valve V1 → the first coolant port K of the battery pack → the second coolant port M of the battery pack → the D port of the direction change valve V1 → the B port of the direction change valve V1 → the water return port of the water pump P1. Then, the process returns to step 501.
Step 508: the PTC is turned off, the water pump P1 is turned off, and the process returns to step 501.
Based on the description, the invention further provides a control device of the series-connection type heat management pipeline of the new energy vehicle. The thermal management pipeline comprises: a water pump; the water inlet of the heating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and all pipelines of all water chambers for heating all the batteries in the battery pack are mutually connected in series; the reversing valve is connected with the water outlet of the heating element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the control device includes: a temperature difference detection element for detecting a cell temperature difference between a cell located on a first side and a cell located on the opposite side in the battery pack; a reversing valve controller for generating a hold command or a reverse command based on a comparison of the battery temperature difference to a predetermined temperature difference threshold value; wherein the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
It should be noted that fig. 3 and 4 are only exemplary structures of the present invention, and all the solutions of serial water circuit plus reversing valve should be considered as included in the embodiments of the present invention. Moreover, the operation shown in fig. 4 is only a typical operation, and all solutions that use a serial water path plus a reversing valve, and whether the thermal management system has a heating function, a cooling function, or only a liquid circulation function, should be considered to be included in the embodiments of the present invention.
Fig. 6 is a second exemplary block diagram of a series thermal management system of a new energy vehicle according to the present invention.
As shown in fig. 6, the system includes:
a water pump P1;
a refrigeration element; the water inlet of the refrigeration element is connected with the water outlet of the water pump P1 in series;
a battery pack including a plurality of batteries, including a first coolant port K disposed at a first side of the battery pack and a second coolant port M disposed at an opposite side of the first side; the pipelines of the water chambers in the battery pack for cooling the batteries are connected in series (for example, in fig. 4, the pipelines of the water chamber 1, the water chamber 2 and the water chamber n are connected in series, where the water chamber 1 is connected to the first cooling liquid interface K, the water chamber n is connected to the second cooling liquid interface M, and n is the number of batteries);
the reversing valve V1 is respectively connected with the water outlet of the refrigeration element, the water return port of the water pump P1, the first cooling liquid interface K and the second cooling liquid interface M;
a temperature difference detecting element for detecting a battery temperature difference between a battery located on a first side and a battery located on an opposite side in the battery pack;
a reversing valve controller for generating a hold command or a reversing command based on a comparison of the battery temperature difference with a predetermined temperature difference threshold value;
wherein the directional control valve maintains the water path direction from the first coolant port K to the second coolant port M based on the hold command and switches the water path direction from the second coolant port M to the first coolant port K based on the directional control command.
Therefore, the battery pack comprises a plurality of batteries, and pipelines in the battery pack, which are used for cooling water chambers of the batteries, are connected in series, so that the series-type thermal management system for the new energy vehicle is realized, and the problem of non-uniformity of flow of a parallel cooling system can be solved.
In one embodiment, the directional valve V1 may be implemented as a solenoid directional valve, a motorized directional valve, an electro-hydraulic directional valve, or a manual directional valve, among others. Preferably, the directional valve V1 is implemented as a two-position four-way solenoid directional valve, a two-position six-way solenoid directional valve, a three-position four-way solenoid directional valve, or a three-position six-way solenoid directional valve, among others.
While specific examples of reversing valves are shown above for illustration, those skilled in the art will appreciate that this description is by way of example only, and is not intended to limit the scope of embodiments of the present invention.
In one embodiment, the reversing valve controller is configured to generate a hold command when the battery temperature difference is less than or equal to a predetermined temperature difference threshold, generate a reverse command when the battery temperature difference is greater than the predetermined temperature difference threshold, and continue to generate the hold command for a predetermined time after the reverse command is generated.
Thus, by continuing to generate the hold command for a predetermined time after the generation of the reverse command, frequent switching of the reversing valve can be prevented.
Preferably, the cooling element can be embodied as a water chiller. When the heating element is embodied as a water chiller, the battery water circuit of the new energy vehicle shown in fig. 4 includes a P1 water pump, a water chiller, a reversing valve V1, a battery pack, and a pipeline, wherein the battery pack includes a plurality of batteries, and the pipelines of the water chambers of the battery packs for cooling the batteries are connected in series. At this time, the working process is as follows:
at the initial moment of starting the thermal management system, the water pump P1 and the water chiller work, and meanwhile, the reversing valve V1 keeps the initial state, and the thermal management system can provide a refrigerant for the battery pack. At this time, the flow sequence of the cooling liquid is shown in fig. 4, specifically: the water outlet of the water pump P1 → the water chiller → the port a of the selector valve V1 → the port C of the selector valve V1 → the first coolant port K of the battery pack → the second coolant port M of the battery pack → the port D of the selector valve V1 → the port B of the selector valve V1 → the water return port of the water pump P1. At this time, the coolant is first cooled in the water chiller, and then flows through the first coolant port K of the battery pack and then flows through the second coolant port M of the battery pack. That is, the battery on the first coolant connection K side of the battery pack is first cooled, and then the battery on the second coolant connection M side of the battery pack is cooled. After a period of cooling, due to the nonuniformity of the internal temperature of the series pipeline, the temperature nonuniformity also occurs inside the battery pack, which is represented by that the temperature near the water inlet of the battery pack is low and the temperature near the water outlet of the battery pack is high, namely, the temperature of the battery on the side of the first cooling liquid interface K is relatively low, and the temperature of the battery on the side of the second cooling liquid interface M is relatively high.
The temperature difference detection element continuously detects a battery temperature difference of the battery pack (for example, detects a battery temperature difference between a battery closest to the first coolant port K and a battery closest to the second coolant port). The battery temperature difference can be understood to be an absolute value. Specifically, the process of the temperature difference detection element continuously detecting the battery temperature difference of the battery pack includes: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by a plurality of temperature sensors, and executing a first discarding process on the detection values, the first discarding process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, and calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the temperature difference.
When the battery temperature difference (temperature difference for short) detected by the temperature difference detection element is less than or equal to a preset threshold value a, the reversing valve controller generates a holding command, and the reversing valve does not execute reversing operation. When the temperature difference detected by the temperature difference detection element is larger than a preset threshold value a, the reversing valve controller generates a reversing command, and the reversing valve V1 is reversed to enable the water inlet and the water outlet of the battery pack to be interchanged.
Fig. 7 is a schematic view of a thermal management water circuit after the reversing operation of the reversing valve in fig. 6 is performed.
As can be seen from fig. 7, after the reversing operation is performed, the flow order of the cooling liquid is adjusted to: the water outlet of the water pump P1 → the water chiller → the port a of the selector valve V1 → the port D of the selector valve V1 → the second coolant port M of the battery pack → the first coolant port K of the battery pack → the port C of the selector valve V1 → the port B of the selector valve V1 → the water return port of the water pump P1. At this time, the cooling liquid is first cooled in the water chiller, and then flows through the second cooling liquid interface M of the battery pack, and then flows through the first cooling liquid interface K of the battery pack. That is, the battery on the side of the second coolant connection M of the battery pack is first cooled, and then the battery on the side of the first coolant connection K of the battery pack is cooled. After a period of cooling, due to the non-uniformity of the internal temperature of the series pipeline, after the operation for a period of time, the temperature difference of the battery in the battery pack is reduced (namely, the battery temperature on the side of the first cooling liquid interface K is gradually close to the battery temperature on the side of the second cooling liquid interface M), and the operation is continued in the state. And then the temperature difference becomes zero, namely the battery temperature on the side of the first cooling liquid interface K is the same as the battery temperature on the side of the second cooling liquid interface M, the operation is continued by keeping the state, the temperature difference is increased from zero (the battery temperature on the side of the second cooling liquid interface M is gradually lower than the battery temperature on the side of the first cooling liquid interface M), when the temperature difference reaches a value larger than a specific threshold value a, the reversing operation is executed again, and the steps are repeated until the thermal management system is closed.
Based on the description, the invention further provides a control method of the series-connection type heat management pipeline of the new energy vehicle. The thermal management conduit comprises: a water pump; the water inlet of the refrigerating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and pipelines of water chambers for cooling the batteries in the battery pack are connected in series; the reversing valve is connected with the water outlet of the refrigeration element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the method comprises the following steps:
the first step is as follows: the temperature difference detecting element detects the battery temperature difference of the battery pack, and the specific way can refer to the flow of the method shown in fig. 1.
The second step is that: a diverter valve controller generates a hold command or a divert command based on a comparison of the battery temperature difference to a predetermined temperature difference threshold value.
The third step: the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
In one embodiment, the reversing valve controller generating a hold command or a reverse command based on the comparison of the battery temperature difference to a predetermined temperature difference threshold comprises: when the battery temperature difference is less than or equal to the predetermined temperature difference threshold value, the reversing valve controller generates a hold command. In one embodiment, the reversing valve controller generating a hold command or a reverse command based on the comparison of the battery temperature difference to a predetermined temperature difference threshold comprises: when the battery temperature difference is greater than the predetermined temperature difference threshold value, the reversing valve controller generates a reversing command and continues to generate a hold command within a predetermined time after the reversing command is generated.
In one embodiment, after changing the direction of the water path to flow from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises: when the battery temperature difference changes from decreasing to increasing, and when the battery temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command; the reversing valve switches a water path direction from the first coolant interface to the second coolant interface based on the second reversing command.
Fig. 8 is a schematic diagram of a second control flow of the series thermal management system of the new energy vehicle according to the invention.
The flow shown in fig. 8 may apply the handover procedure shown in fig. 6 and 7. In this case, the refrigeration element may be embodied as a water chiller.
As shown in fig. 8, the method includes:
step 801: the temperature T of the battery pack is detected, for example, the temperature T may be an average temperature of the battery pack.
Step 802: when the temperature T of the battery pack is less than the predetermined threshold value a, it may be determined that the cooling process need not be performed for the battery pack, at which point step 808 is performed; when the temperature T of the battery pack is greater than or equal to the predetermined threshold value a, it may be determined that the cooling process needs to be performed for the battery pack, at which time step 803 and the subsequent steps are performed.
Step 803: the water pump P1 is turned on and the chiller is started. At this time, the water pump P1 and the water chiller work, and the reversing valve V1 maintains the initial state, and the thermal management system can provide the refrigerant for the battery pack. At this time, the flow order of the coolant is the water outlet of the water pump P1 → the water chiller → the a port of the selector valve V1 → the C port of the selector valve V1 → the first coolant port K of the battery pack → the second coolant port M of the battery pack → the D port of the selector valve V1 → the B port of the selector valve V1 → the water return port of the water pump P1. At this time, the coolant is first cooled in the water chiller, and then flows through the first coolant port K of the battery pack and then flows through the second coolant port M of the battery pack. That is, the battery on the first coolant connection K side of the battery pack is first cooled, and then the battery on the second coolant connection M side of the battery pack is cooled. After a period of cooling, due to the nonuniformity of the internal temperature of the series pipeline, the temperature nonuniformity also appears in the battery pack, which is represented by that the temperature near the water inlet of the battery pack is low and the temperature near the water outlet of the battery pack is high, namely, the temperature of the battery on the side of the first cooling liquid interface K is low, and the temperature of the battery on the side of the second cooling liquid interface M is high.
Step 804: the temperature difference detection element continuously detects the temperature difference dT of the battery pack (for example, detects the battery temperature difference between the battery closest to the first coolant port K and the battery closest to the second coolant port). The temperature difference can be understood to be an absolute value.
Step 805: when the temperature difference dT detected by the temperature difference detecting element is smaller than a predetermined threshold value B, the directional valve controller generates a hold command and performs step 807: when the temperature difference dT detected by the temperature difference detection element is greater than or equal to a preset threshold value a, the reversing valve controller generates a reversing command and executes step 806;
step 806: the reversing valve reversing command reverses the reversing valve V1 to interchange the stack inlet and outlet ports. That is, the flow order of the coolant is the water outlet of the water pump P1 → the water chiller → the a port of the selector valve V1 → the D port of the selector valve V1 → the second coolant port M of the battery pack → the first coolant port K of the battery pack → the C port of the selector valve V1 → the B port of the selector valve V1 → the water return port of the water pump P1. Then, the process returns to step 801.
Step 807: the direction change valve does not perform the direction change operation based on the holding command, and the direction of the cooling liquid is maintained in the V1 direction, that is, the flow sequence of the cooling liquid is still the water outlet of the water pump P1 → the water chiller → the A port of the direction change valve V1 → the C port of the direction change valve V1 → the first cooling liquid port K of the battery pack → the second cooling liquid port M of the battery pack → the D port of the direction change valve V1 → the B port of the direction change valve V1 → the water return port of the water pump P1. Then, the step 601 is executed.
Step 808: the water chiller is turned off, the water pump P1 is turned off, and the process returns to step 801.
Based on the description, the embodiment of the invention also provides a control device of the series-connection type thermal management pipeline of the new energy vehicle. The thermal management pipeline comprises: a water pump; the water inlet of the refrigerating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and pipelines of water chambers for cooling the batteries in the battery pack are connected in series; the reversing valve is connected with the water outlet of the refrigeration element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the device comprises: a temperature difference detection element for detecting a cell temperature difference between a cell located on a first side and a cell located on the opposite side in the battery pack; a reversing valve controller for generating a hold command or a reverse command based on a comparison of the battery temperature difference to a predetermined temperature difference threshold value; wherein the diverter valve maintains a waterway direction from the first coolant port to the second coolant port based on the hold command and switches the waterway direction from the second coolant port to the first coolant port based on the divert command.
It should be noted that fig. 6 and 7 are only exemplary structures of the present invention, and all the solutions of serial water circuit plus reversing valve should be considered as included in the embodiments of the present invention. Moreover, the operation shown in fig. 6 and 7 is only a typical operation, and all the solutions of adding the reversing valve to the serial water path, and whether the thermal management system has heating, cooling, or only liquid circulation functions, should be considered as included in the embodiments of the present invention.
The series thermal management system provided by the embodiment of the invention can be applied to various new energy automobiles, such as Hybrid Electric Vehicles (HEV), pure electric vehicles (BEV), Fuel Cell Electric Vehicles (FCEV) and other new energy (such as efficient energy storage devices such as super capacitors and flywheels) automobiles.
In summary, in the embodiments of the present invention, a plurality of temperature sensors are arranged at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discarding process, calculating a first standard deviation based on the first mean value, and performing an additional process on the detection values remaining after the first discarding process, the additional process including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of a first standard deviation; and determining the difference between the maximum value and the minimum value in the detection values remaining after the additional processing as the temperature difference of the battery pack. The measured value of the sensor fault is eliminated by utilizing the statistical parameters, and the accuracy of the temperature difference is improved.
In addition, the embodiment of the invention realizes a pipeline scheme of a serial heat management system, and ensures the flow uniformity.
In addition, the embodiment of the invention controls the flow direction of the serial water paths by using the reversing valve, thereby reducing the temperature difference of the battery system.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions or repetitions of the features without departing from the technical spirit of the present invention are included in the scope of the present invention.

Claims (5)

1. A control method for a series-connection type heat management pipeline of a new energy vehicle is characterized in that the heat management pipeline comprises the following steps: a water pump; the water inlet of the heating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and all pipelines of all water chambers for heating all the batteries in the battery pack are mutually connected in series; the reversing valve is connected with the water outlet of the heating element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the method comprises the following steps:
detecting a temperature differential of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, respectively, and performing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; determining a difference between a maximum value and a minimum value among the detection values remaining after the additional processing as the temperature difference;
the reversing valve controller generates a hold command or a reverse command based on a comparison of the temperature difference to a predetermined temperature difference threshold value;
the diverter valve maintains a waterway direction from the first coolant port to a second coolant port based on the hold command and changes the waterway direction from the second coolant port to the first coolant port based on the divert command;
wherein when the commutation command is generated by the commutation valve controller, a hold command is generated continuously for a predetermined time after the commutation command is generated.
2. The method of claim 1, wherein the reversing valve controller generating a hold command or a reverse command based on the comparison of the temperature difference to a predetermined temperature difference threshold comprises:
when the temperature difference is greater than the predetermined temperature difference threshold value, the reversing valve controller generates the reversing command and continuously generates a hold command within a predetermined time after the reversing command is generated.
3. The method of controlling the series thermal management circuit of the new energy vehicle of claim 2, wherein after reversing the water path direction from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises:
when the temperature difference changes from decreasing to increasing, and when the temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command;
the reversing valve switches a water path direction from the first coolant interface to the second coolant interface based on the second reversing command.
4. A control method for a series-connection type heat management pipeline of a new energy vehicle is characterized in that the heat management pipeline comprises the following steps: a water pump; the water inlet of the refrigerating element is connected with the water outlet of the water pump in series; the cooling system comprises a battery pack comprising a plurality of batteries, a first cooling liquid interface and a second cooling liquid interface, wherein the first cooling liquid interface is arranged on a first side of the battery pack, the second cooling liquid interface is arranged on the opposite side of the first side, and pipelines of water chambers for cooling the batteries in the battery pack are connected in series; the reversing valve is connected with the water outlet of the refrigeration element, the water return port of the water pump, the first cooling liquid interface and the second cooling liquid interface respectively; the method comprises the following steps:
detecting a temperature differential of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values provided by the plurality of temperature sensors, and executing a first discard process on the detection values, the first discard process including: discarding detection values greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the detection values remaining after the first discard processing, and calculating a first standard deviation based on the first mean value, and performing additional processing on the detection values remaining after the first discard processing, the additional processing including: performing a second discarding process of discarding a detection value having an absolute value of a difference from the first mean value larger than a predetermined multiple of the first standard deviation; determining a difference between a maximum value and a minimum value among the detection values remaining after the additional processing as the temperature difference;
the reversing valve controller generates a hold command or a reverse command based on a comparison of the temperature difference to a predetermined temperature difference threshold value;
the diverter valve maintains a waterway direction from the first coolant port to a second coolant port based on the hold command and changes the waterway direction from the second coolant port to the first coolant port based on the divert command;
wherein when the commutation command is generated by the commutation valve controller, a hold command is generated continuously for a predetermined time after the commutation command is generated.
5. The method for controlling the series thermal management pipeline of the new energy vehicle according to claim 4, wherein the generating of the hold command or the direction change command by the direction change valve controller based on the comparison of the temperature difference with a predetermined temperature difference threshold value comprises: when the temperature difference is larger than the preset temperature difference threshold value, the reversing valve controller generates a reversing command and continuously generates a holding command within a preset time after the reversing command is generated;
after changing the direction of the water path from the second coolant interface to the first coolant interface based on the reversing command, the method further comprises:
when the temperature difference changes from decreasing to increasing, and when the temperature difference is larger than the preset temperature difference threshold value again, the reversing valve controller generates a second reversing command;
the reversing valve switches a water path direction from the first coolant interface to the second coolant interface based on the second reversing command.
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