CN110994077A - Uniform temperature heating method for power battery pack and storage medium - Google Patents
Uniform temperature heating method for power battery pack and storage medium Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 216
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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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
- H01M10/60—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
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to a temperature equalizing and heating method of a power battery pack, which comprises the following steps: measuring the temperature change conditions of different areas of a battery module of the power battery pack in the use process; dividing the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition; the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the bottom of the battery module is within a preset range in the heating process. Utilize the different regional nature cooling of battery module and the characteristic of initiative heating, set up less heating power in the slow region of nature cooling, set up great heating power in the fast region of nature cooling, realize power battery package samming and reduce energy consumption's dual effect.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a uniform-temperature heating method and a storage medium for a power battery pack.
Background
With the continuous development of new energy automobile technology and the continuous improvement of environmental awareness of people, electric automobiles are increasingly popularized. The electric automobile uses a power battery (namely a battery pack) as a power source to drive a power motor to push the automobile to move forward, the power battery is used as a main power source of a new energy automobile, the requirement on the working environment temperature is severe, and the working environment temperature of the power battery is generally required to be-30.0-60.0 ℃ in order to meet the normal use in the national range. When the power battery works in a high-temperature environment, the cycle life is reduced; when the battery operates in a low-temperature environment, the charge and discharge capacity is reduced. This is determined by the chemical properties of the power cell itself. In order to make up for the short plate of the chemical property of the power battery, the working temperature of the power battery needs to be effectively controlled, so that the power battery works in a more ideal working temperature range, and the influence of the temperature on the working performance of the power battery is reduced.
In the prior art, methods for reducing the temperature difference of the power battery pack are realized by uniformly controlling a heating system, and the problems are as follows: the temperature of a single battery module cannot be accurately controlled; the energy consumption is large.
Disclosure of Invention
Therefore, a uniform temperature heating method and a storage medium for a power battery pack are needed to be provided, and the technical problems that in the prior art, accurate control cannot be achieved on a single battery module, and energy consumption in a heating process is high are solved.
In order to achieve the above purpose, the inventor provides a temperature equalization heating method for a power battery pack, comprising the following steps:
measuring the temperature change conditions of different areas of a battery module of the power battery pack in the use process;
dividing the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition;
the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the battery module is within a preset range in the heating process.
Further, in the step of measuring the temperature variation conditions of different areas of the battery module of the power battery pack in the using process, the method specifically comprises the following steps:
obtaining cooling rates of different areas of a battery module of the power battery pack through a low-temperature heat insulation test or simulation analysis;
and obtaining the heating rates of different areas of the battery module of the power battery pack through a low-temperature heating test or simulation analysis.
Further, divide into the slow region of natural cooling, the fast regional step of natural cooling according to the temperature variation condition that the measurement reachs with battery module:
the area with the cooling rate more than 1 ℃/h is divided into a natural cooling fast area;
the area with the cooling rate less than or equal to 1 ℃/h is divided into a natural cooling slow area.
Furthermore, in the step of respectively arranging the heating units with different heating powers in the slow natural cooling area and the fast natural cooling area,
at least three different sets of heating powers are provided.
Furthermore, in the step of respectively arranging the heating units with different heating powers in the slow natural cooling area and the fast natural cooling area,
establishing a heating rate-heating power function Q of each module according to the heating rates of at least three groups of battery modules under different heating powersi(x) (i is from 1 to N, and N is the number of battery modules in the battery pack);
measuring the lowest heating target temperature T according to the preset target value of the system0And a heating time t0Then the lowest temperature rise rate V of the battery pack0＝(T0-TInitial temperature)/t0。
Furthermore, in the step of respectively arranging the heating units with different heating powers in the slow natural cooling area and the fast natural cooling area,
determining a heating target temperature threshold T of the battery module according to the temperature change conditions of different areas at the bottom of the battery modulei(i ranges from 1 to N, and N is the number of the battery pack internal modules).
Further, after the step of respectively setting different heating power heating units in the slow natural cooling area and the fast natural cooling area, the method further comprises the following steps:
battery module heating target temperature T in natural cooling fast regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the temperature difference of the bottom of the battery module and is within a preset range;
heating target temperature T of battery module in natural cooling slow regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the preset range.
Further, after the step of respectively setting different heating power heating units in the slow natural cooling area and the fast natural cooling area, the method further comprises the following steps:
according to the heating rate-heating power function Qi (x) of the battery module and the heating target temperature of the battery module, calculating the heating power P of the heating unit corresponding to the battery modulei＝Q-1(Vi) (i ranges from 1 to N, and N is the number of the battery pack internal modules).
Further, at least three different sets of heating powers are provided, all within a power range of 50W-100W.
Different from the prior art, the method for realizing the temperature equalization heating of the battery pack in the technical scheme comprises the following steps: measuring the temperature change conditions of different areas of a battery module of the power battery pack in the use process; dividing the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition; the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the battery module is within a preset range in the heating process. Utilize the different regional nature of cooling down and the characteristic of initiative heating of battery module, set up less heating power in the slow region of natural cooling down, set up great heating power in the fast region of natural cooling down, realize the samming function of initiative heating through setting up different heating power in different regions, reached the dual effect that realizes power battery package samming and reduce energy resource consumption.
The inventors also provide a computer readable storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of any of the above-described embodiments.
Different from the prior art, the method for realizing the temperature equalization heating of the battery pack in the technical scheme comprises the following steps: measuring the temperature change conditions of different areas of a battery module of the power battery pack in the use process; dividing the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition; the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the battery module is within a preset range in the heating process. Utilize the different regional nature of cooling down and the characteristic of initiative heating of battery module, set up less heating power in the slow region of natural cooling down, set up great heating power in the fast region of natural cooling down, realize the samming function of initiative heating through setting up different heating power in different regions, reached the dual effect that realizes power battery package samming and reduce energy resource consumption.
Drawings
FIG. 1 is a flow chart illustrating a power calculation for a battery module heating unit according to an embodiment;
FIG. 2 is a schematic structural diagram of a power battery pack according to an embodiment;
fig. 3 is a schematic structural view of a single battery module according to an embodiment;
fig. 4 is a circuit connection structure diagram of the power battery pack according to the embodiment.
Description of reference numerals:
1. a battery module;
2. a battery module temperature measuring component;
21. a first temperature sensor;
22. a second temperature sensor;
3. a heating unit;
4. a heating control module;
5. heating the relay;
6. a fuse;
7. a heating unit temperature measuring component;
71. a third temperature sensor;
72. a fourth temperature sensor;
8. a heat conducting member.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the present embodiment provides a method for heating a power battery pack at a uniform temperature, which measures temperature variation conditions of different areas of a battery module of the power battery pack during use;
s101, obtaining cooling rates of different areas of a battery module of the power battery pack through a low-temperature heat insulation test or simulation analysis; dividing the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition; specifically, a test is carried out according to a temperature sensor, and a region with the cooling rate of more than 1 ℃/h is divided into a natural cooling fast region; the area with the cooling rate less than or equal to 1 ℃/h is divided into a natural cooling slow area.
And S102, obtaining the heating rates of different areas of the battery module of the power battery pack through a low-temperature heating test or simulation analysis. Specifically, the heating rates of the battery modules under at least three groups of heating powers are obtained through a low-temperature heat insulation test or simulation analysis. Specifically, at least three different groups of heating powers are arranged, and all the different heating powers are in a power range of 50W-100W. The fitting accuracy of the subsequent function can be better ensured.
S103, after the heating rates of the slow natural cooling area and the fast natural cooling area are obtained, the method further comprises the following steps:
establishing a heating rate-heating power function Q of each module according to the heating rates of at least three groups of battery modules under different heating powersi(x) (i is from 1 to N, and N is the number of battery modules in the battery pack);
measuring the lowest heating target temperature T according to the preset target value of the system0And a heating time t0Then the lowest temperature rise rate V of the battery pack0＝(T0-TInitial temperature)/t0。
S104, after obtaining the heating rate or the cooling rate for the slow natural cooling area and the fast natural cooling area respectively, further comprising the following steps,
determining a heating target temperature threshold T of the battery module according to the temperature change conditions of different areas at the bottom of the battery modulei(i ranges from 1 to N, and N is the number of the battery pack internal modules).
Further, the heating target temperature threshold T of the battery module is determinediBefore the steps, the method also comprises the following steps:
battery module heating target temperature T in natural cooling fast regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the preset range of the battery module;
heating target temperature T of battery module in natural cooling slow regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the preset range.
S105, naturally cooling the battery module in the slow region to increase the temperature rate VH＝(TH-TInitial temperature)/t0＝V0And the temperature rise rate V of the battery module in the slow natural cooling areaH＝(TL-TInitial temperature)/t0The temperature rise rate V of each modulei＝(Ti-TInitial temperature)/t0；
S106, determining the heating target temperature threshold T of the battery moduleiAfter the step (A), the method also comprises the following steps,
according to the heating rate-heating power function Qi (x) of the battery module and the heating target temperature of the battery module, calculating the heating power P of the heating unit corresponding to the battery modulei＝Q-1(Vi) (i ranges from 1 to N, and N is the number of the battery pack internal modules).
The present embodiment also provides a computer-readable storage medium, on which a computer program is stored, wherein the program is configured to, when executed by a processor, implement the steps of the above-mentioned technical method.
The technical scheme is a method for realizing the temperature equalization heating of the battery pack through the following steps: measuring the temperature change conditions of different areas of a battery module of the power battery pack in the use process; dividing the bottom of the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition; the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the battery module is within a preset range in the heating process. Utilize the different regional nature of cooling down and the characteristic of initiative heating of battery module, set up less heating power in the slow region of natural cooling down, set up great heating power in the fast region of natural cooling down, realize the samming function of initiative heating through setting up different heating power in different regions, reached the dual effect that realizes power battery package samming and reduce energy resource consumption.
Referring to fig. 2 to 4, the present embodiment further relates to a power battery pack with uniform temperature heating, which includes a battery module 1, a battery module temperature measuring assembly 2, a heating unit 3, and a heating control module 4, where the battery module includes a first battery module region and a second battery module region.
As shown in fig. 2 and 3, the battery module temperature measuring assembly 2 includes a first temperature sensor 21 and a second temperature sensor 22, the first temperature sensor 21 is disposed in the first battery module region for measuring a temperature variation range of the first battery module region, and the second temperature sensor 22 is disposed in the second battery module region for measuring a temperature variation range of the second battery module region; specifically, the battery module is divided into a first battery module area with fast natural cooling and a second battery module area with slow natural cooling according to the measurement condition of the battery module temperature measuring component 2.
The heating unit 3 is arranged at the bottom of the battery module 1, the heating unit 3 comprises a first heating module and a second heating module, specifically, the first heating module and the second heating module are mutually connected in series to form a heating loop, so that the whole heating unit 3 can be conveniently controlled and monitored, the first heating module is arranged at the bottom of the first battery module area, and the second heating module is arranged at the bottom of the second battery module area. In other cases, the heating unit 3 may also be disposed around the battery module 1, so as to more fully realize the temperature equalization effect of the power battery pack.
As shown in fig. 4, further, a heating relay 5 is disposed on the heating circuit, and the heating relay 5 is disposed on the heating circuit and used for controlling connection and disconnection of the heating circuit. The circuit has the functions of automatic adjustment, safety protection and circuit conversion.
Further, a fuse 6 is arranged on the heating circuit, and the fuse 6 is used for preventing the heating circuit from overcurrent risk. The fuse 6 can be fused to cut off current when the circuit abnormally rises to a certain height and heat, so that the safe operation of the circuit is protected.
The first heating module is used for setting heating power according to the data sent by the first temperature sensor 21, and the second heating module is used for setting heating power according to the data sent by the second temperature sensor 22, so that the temperature difference between the first battery module area and the second battery module area is within a preset threshold range.
The heating control module 4 is electrically connected to the heating unit 3, and the heating control module 4 is used for controlling the heating unit 3 and monitoring the temperature of the heating unit 3. The method is characterized in that a first battery module area with low natural cooling is provided with a first heating power, a second battery module area with low natural cooling is provided with a second heating power, and a first battery module area with high natural cooling is provided with a second heating power; when the heating process is finished, the area with slow natural cooling is changed into a low-temperature area, the area with fast natural cooling is changed into a high-temperature area, in the low-temperature charging process after the heating is stopped, the high-temperature area is cooled fast, the low-temperature area is cooled slowly, and the temperature difference of the battery pack is in a contraction reduction trend, namely, the passive temperature equalization function without heating in the low-temperature charging process is realized.
Furthermore, a heating unit temperature measuring component 7 is further arranged on the heating unit 3, and the heating unit temperature measuring component 7 is used for monitoring the temperature change condition of the heating unit 3. Specifically, the heating unit temperature measuring assembly 7 includes a third temperature sensor 71 and a fourth temperature sensor 72, the third temperature sensor 71 is disposed on the first heating module, and the fourth temperature sensor 72 is disposed on the second heating module. Specifically, the third temperature sensor 71 and the fourth temperature sensor 72 are respectively disposed on the first heating module with fast natural cooling and the second heating module with slow natural cooling, so as to monitor the operating temperature of the heating unit 3 in real time, and facilitate prediction and feedback of the operating condition of the heating unit 3.
Further, the heating unit temperature measurement component 7 is connected with the heating control module 4, and the temperature change condition of the heating unit temperature measurement component 7 is used as an observation parameter of the heating control module 4. Specifically, when the temperature of the heating unit 3 is too high, the heating control module 4 can timely disconnect the heating circuit to prevent the heating unit 3 from being damaged.
Further, the power supply of the heating control module 4 is from a vehicle-mounted charger, a battery pack or a direct current charging column.
Further, a heat conducting member 8 is further arranged between the heating unit 3 and the battery module, and the heat conducting member 8 is used for reducing heat resistance. The heat conducting member 8 is made of a flexible filling material, and specifically may be a flexible heat conducting sheet, a heat conducting silicone grease, a heat conducting potting material, a heat conducting adhesive tape, a heat conducting phase change material, and the like.
Further, the heating unit 3 is a silica gel heating sheet. In other examples, the heating unit 3 may also be a PTC heating plate, a mica sheet heating plate, or a polyimide heating film.
The in-process that power battery was using, when heating, heating power is designed according to the intensification and the cooling characteristic of the different regions of battery module, thereby guarantee that the system's difference in temperature among the heating process is in target threshold value within range, can realize high-efficient rapid heating simultaneously again, reduce the heating system energy consumption, reduce low temperature charge time, when realizing the heating process and ending, the slow region of natural cooling becomes low temperature zone, the fast region of natural cooling becomes high temperature zone, in the low temperature charging process after the heating stops, the high temperature zone cooling is fast, the low temperature zone cooling is slow, the battery package difference in temperature is the shrink trend of reducing, realize the passive samming function in the low temperature charging process (not heating promptly). The battery pack temperature equalizing device solves the problem that most low-temperature heating systems cannot realize the temperature equalizing function in the low-temperature charging process (without heating), and can realize the temperature equalizing without starting the heating system, thereby meeting the requirement of the battery pack temperature equalizing function and not increasing extra energy consumption. The active temperature equalizing function and the passive temperature equalizing function are combined together, the whole process temperature equalizing function at low temperature is realized, the temperature equalizing function in the heating process is ensured, the temperature equalizing function in the charging process is also ensured, and the dual effects of temperature equalizing and energy consumption reduction are achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
As will be appreciated by one skilled in the art, the above-described embodiments may be provided as a method, apparatus, or computer program product. These embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. All or part of the steps in the methods according to the embodiments may be implemented by a program instructing associated hardware, where the program may be stored in a storage medium readable by a computer device and used to execute all or part of the steps in the methods according to the embodiments. The computer devices, including but not limited to: personal computers, servers, general-purpose computers, special-purpose computers, network devices, embedded devices, programmable devices, intelligent mobile terminals, intelligent home devices, wearable intelligent devices, vehicle-mounted intelligent devices, and the like; the storage medium includes but is not limited to: RAM, ROM, magnetic disk, magnetic tape, optical disk, flash memory, U disk, removable hard disk, memory card, memory stick, network server storage, network cloud storage, etc.
The various embodiments described above are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a computer apparatus to produce a machine, such that the instructions, which execute via the processor of the computer apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer apparatus to cause a series of operational steps to be performed on the computer apparatus to produce a computer implemented process such that the instructions which execute on the computer apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (10)
1. A temperature equalization heating method of a power battery pack is characterized by comprising the following steps:
measuring the temperature change condition of a battery module of the power battery pack in the using process;
dividing the bottom of the battery module into a slow natural cooling area and a fast natural cooling area according to the measured temperature change condition;
the heating units with different heating powers are respectively arranged in the natural cooling slow area and the natural cooling fast area, and are used for ensuring that the temperature difference of the battery module is within a preset range in the heating process.
2. The temperature equalizing and heating method of claim 1, wherein in the step of measuring the temperature change conditions of different areas of the battery module of the power battery pack during use, the method specifically comprises the following steps:
obtaining cooling rates of different areas of a battery module of the power battery pack through a low-temperature heat insulation test or simulation analysis;
and obtaining the heating rates of different areas of the battery module of the power battery pack through a low-temperature heating test or simulation analysis.
3. The temperature equalizing and heating method of the power battery pack according to claim 2, wherein the step of dividing the battery module into a slow natural cooling region and a fast natural cooling region according to the measured temperature change condition is as follows:
the area with the cooling rate more than 1 ℃/h is divided into a natural cooling fast area;
the area with the cooling rate less than or equal to 1 ℃/h is divided into a natural cooling slow area.
4. The temperature-equalizing heating method of a power battery pack according to claim 2, wherein in the step of obtaining the temperature-increasing rates for the slow-cooling region and the fast-cooling region,
and obtaining the heating rates of the battery modules under at least three groups of heating power through a low-temperature heat insulation test or simulation analysis.
5. The temperature equalizing and heating method of the power battery pack according to claim 4, wherein after the temperature rising rates are obtained for the slow natural cooling region and the fast natural cooling region, the method further comprises the following steps:
establishing a heating rate-heating power function Q of each module according to the heating rates of at least three groups of battery modules under different heating powersi(x) (i is from 1 to N, and N is the number of battery modules in the battery pack);
measuring the lowest heating target temperature T according to the preset target value of the system0And a heating time t0Then the lowest temperature rise rate V of the battery pack0＝(T0-TInitial temperature)/t0。
6. The temperature equalizing and heating method of the power battery pack according to claim 3 or 4, wherein after the temperature rising rate or the temperature lowering rate is obtained for the slow natural temperature lowering region and the fast natural temperature lowering region, the method further comprises the following steps:
determining a heating target temperature threshold T of the battery module according to the temperature change conditions of different areas of the battery modulei(i ranges from 1 to N, and N is the number of the battery pack internal modules).
7. The temperature-equalizing heating method of claim 6, wherein the heating target temperature threshold T of the battery module is determinediBefore the steps, the method also comprises the following steps:
battery module heating target temperature T in natural cooling fast regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the preset range of the battery module;
heating target temperature T of battery module in natural cooling slow regionLAbove the minimum heating target temperature T0And T isL-T0The temperature difference is not greater than the bottom of the battery module and is within a predetermined range.
8. The temperature-equalizing heating method of claim 7, wherein the heating target temperature threshold T of the battery module is determinediAfter the step, the method also comprises the following steps:
according to the heating rate-heating power function Qi (x) of the battery module and the heating target temperature of the battery module, calculating the heating power P of the heating unit corresponding to the battery modulei＝Q-1(Vi) (i ranges from 1 to N, and N is the number of the battery pack internal modules).
9. The temperature equalizing and heating method for power battery pack according to claim 4, wherein at least three different heating power sets are provided, and the power ranges from 50W to 100W.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that,
the program when executed by a processor implementing the steps of any of claims 1 to 9.
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