CN114619925B - Low-temperature quick-charging heating method, device, equipment and storage medium for lithium ion battery - Google Patents

Low-temperature quick-charging heating method, device, equipment and storage medium for lithium ion battery Download PDF

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Publication number
CN114619925B
CN114619925B CN202210330798.0A CN202210330798A CN114619925B CN 114619925 B CN114619925 B CN 114619925B CN 202210330798 A CN202210330798 A CN 202210330798A CN 114619925 B CN114619925 B CN 114619925B
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heating
temperature
rise rate
temperature rise
charging
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CN114619925A (en
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岳泓亚
李云隆
马剑昌
张有洪
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Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
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Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
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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
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • H01M10/62—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
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to a low-temperature quick-charge heating method, a device, equipment and a storage medium for a lithium ion battery. The method comprises the following steps: acquiring the current minimum temperature of the battery system, comparing the current minimum temperature with a preset temperature threshold value, and acquiring a heating strategy according to a comparison result; acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to a heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate; comparing the second time length with the first time length, adjusting the first temperature rise rate according to the comparison result, obtaining the second temperature rise rate, and obtaining the heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold; according to the second temperature rise rate and the heating time length, the heating power is obtained, and the battery system is heated according to the heating power, so that the problems of untimely heating, large energy consumption and the like of the lithium ion battery can be solved.

Description

Low-temperature quick-charging heating method, device, equipment and storage medium for lithium ion battery
Technical Field
The invention relates to the technical field of heat management of power batteries of new energy automobiles, in particular to a low-temperature quick-charge heating method, a device, equipment and a storage medium of a lithium ion battery.
Background
With the global emphasis on energy and environmental protection, new energy automobile industry is rapidly developed. The lithium ion battery is used as a power source of the new energy automobile, belongs to an important component of the new energy automobile, and the performance of the lithium ion battery directly influences the use of the electric automobile. Among all environmental factors, the temperature has the greatest influence on the charge and discharge performance of the lithium ion battery, and although the operating temperature range of the lithium ion battery is generally set to-20 ℃ to 45 ℃, when the operating temperature of the lithium ion battery is too low, the performance of the lithium ion battery is reduced, and the charge and discharge capability is also reduced. At present, a heating system can be arranged on a power battery, a heating loop is firstly started in a low-temperature charging stage, charging is forbidden, and charging is started after the temperature of the battery system rises. However, the method does not consider the environmental conditions in the charging process, which may cause problems of untimely heating, large energy consumption and the like of the lithium ion battery.
Disclosure of Invention
Based on the above, it is necessary to provide a method, a device and a storage medium for low-temperature rapid charging and heating of a lithium ion battery, so as to solve the problem of poor heating performance in the charging process of the lithium ion battery.
In one aspect, a low-temperature fast-charging heating method for a lithium ion battery is provided, and the low-temperature fast-charging heating method for the lithium ion battery comprises the following steps:
acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
In one embodiment, the step of comparing the current minimum temperature with a preset temperature threshold value, and obtaining the heating strategy according to the comparison result includes:
Judging whether the current minimum temperature is smaller than a preset first temperature threshold value or not;
if yes, a first heating strategy is obtained;
if not, a second heating strategy is obtained, and whether the current minimum temperature is larger than a preset second temperature threshold value is judged; if yes, a third heating strategy is obtained; if not, a second heating strategy is obtained.
In one embodiment, the step of obtaining a first time period required to charge from a current state of charge of the battery system to a preset target state of charge according to the heating strategy comprises:
judging whether the heating strategy is a second heating strategy or not;
if so, acquiring the first time length required for charging from the current state of charge to the target state of charge through a battery management system.
In one embodiment, the step of obtaining the second time period required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate includes:
acquiring a first voltage, a first current and a first temperature of the battery system at a first moment, adding a plurality of preset time steps to the first moment, and acquiring a plurality of second moments;
acquiring a plurality of second temperatures of the battery system at a plurality of second moments according to the first temperature rise rate and the first temperature; acquiring a plurality of second voltages of the battery system at a plurality of second moments according to the first voltage, the first current and the internal resistance of the battery system;
And obtaining a plurality of second currents according to the second temperatures and the second voltages, obtaining a charging curve according to the second currents, and obtaining a second time length required for charging from the current state of charge to the target state of charge according to the charging curve.
In one embodiment, the step of comparing the second duration with the first duration, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining the heating duration according to the second temperature rise rate, the current minimum temperature, and the temperature threshold includes:
judging whether the second time length is longer than the first time length;
if yes, adding the first temperature rise rate and a preset temperature rise step length to obtain the second temperature rise rate;
if not, setting the first temperature rise rate as the second temperature rise rate;
and updating the current minimum temperature according to the second temperature rise rate, acquiring updated current minimum temperature, and recording the heating time length required by the updated current minimum temperature being greater than the temperature threshold as the heating time length.
In one embodiment, the step of obtaining heating power according to the second temperature rise rate and the heating duration, and performing heat treatment on the battery system according to the heating power includes:
Acquiring the required heat of the battery system, acquiring the generated heat of the battery system corresponding to the second temperature rise rate, and acquiring the heat dissipation capacity between the battery system corresponding to the second temperature rise rate and a charging environment;
obtaining output heat of the heating device according to the required heat, the generated heat and the heat dissipation, wherein the mathematical expression is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat quantity, Q2 represents the generated heat quantity, Q3 represents the heat radiation quantity, and Q4 represents the output heat quantity;
obtaining the heating power according to the output heat, the preset heat efficiency and the heating duration, wherein the mathematical expression is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating duration.
In one embodiment, the step of obtaining the current minimum temperature of the battery system and comparing the current minimum temperature with a preset temperature threshold value further comprises:
acquiring allowable charging power of the battery system and output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
if yes, keeping the battery system at the current minimum temperature;
If not, the current minimum temperature is obtained, and the current minimum temperature is compared with the temperature threshold.
On the other hand, provide a lithium ion battery low temperature fills heating device soon, lithium ion battery low temperature fills heating device soon includes:
the heating strategy acquisition module is used for acquiring the current minimum temperature of the battery system, comparing the current minimum temperature with a preset temperature threshold value and acquiring a heating strategy according to a comparison result;
a charging duration obtaining module, configured to obtain a first duration required for charging from a current state of charge of the battery system to a preset target state of charge according to the heating policy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
the heating duration obtaining module is used for comparing the second duration with the first duration, adjusting the first temperature rise rate according to a comparison result, obtaining a second temperature rise rate, and obtaining the heating duration according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and the heating processing module is used for acquiring heating power according to the second temperature rise rate and the heating duration and performing heating processing on the battery system according to the heating power.
In yet another aspect, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of:
acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
In yet another aspect, a computer readable storage medium is provided, having stored thereon a computer program which when executed by a processor performs the steps of:
Acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
According to the low-temperature quick-charging heating method, device, computer equipment and storage medium for the lithium ion battery, the current minimum temperature is compared with the preset temperature threshold value, so that a heating strategy is obtained; then, a first time length and a second time length required for charging from the current state of charge to the target state of charge are respectively obtained according to the battery management system and a preset first temperature rise rate; then, the first temperature rise rate is adjusted according to the comparison result of the second time length and the first time length, the second temperature rise rate is obtained, and the heating time length is obtained according to the second temperature rise rate, the current minimum temperature and the temperature threshold; and finally, heating power is obtained according to the second temperature rise rate and the heating time length, and the battery system is heated according to the heating power, so that the problems that the lithium ion battery is not heated timely, the energy consumption is high and the like in the low-temperature quick charging process of the new energy automobile are solved.
Drawings
Fig. 1 is an application environment diagram of a low-temperature rapid charging heating method of a lithium ion battery in an embodiment;
FIG. 2 is a schematic flow chart of a low-temperature fast-charge heating method for a lithium ion battery according to an embodiment;
FIG. 3 is a flow diagram of acquiring a heating strategy in one embodiment;
FIG. 4 is a flowchart illustrating a first time period acquisition process according to an embodiment;
FIG. 5 is a flowchart illustrating a second time period acquisition process according to an embodiment;
FIG. 6 is a schematic flow chart of a method for obtaining a heating duration in one embodiment;
FIG. 7 is a schematic flow chart of a heating process for a battery system in one embodiment;
FIG. 8 is a flow chart illustrating steps prior to acquiring a heating strategy in one embodiment;
fig. 9 is a block diagram of a low-temperature fast-charging heating device for a lithium ion battery in another embodiment;
fig. 10 is an internal structural view of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The low-temperature quick-charging heating method for the ion battery provided by the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. For example, the low-temperature quick-charge heating method for the ion battery provided by the application can be applied to a scene of heating the lithium ion battery in a low-temperature quick-charge process of a new energy automobile, wherein the new energy automobile comprises a PHEV (Plug in Hybrid Electric Vehicle, plug-in hybrid Electric Vehicle) and an EV (Electric Vehicle), the lithium ion battery is used as a power source of the new energy automobile, belongs to an important component of the new energy automobile, and the performance of the lithium ion battery directly influences the use of the Electric automobile. Among all environmental factors, the temperature has the greatest influence on the charge and discharge performance of the lithium ion battery, and although the operating temperature range of the lithium ion battery is generally set to-20 ℃ to 45 ℃, when the operating temperature of the lithium ion battery is too low, the performance of the lithium ion battery is reduced, and the charge and discharge capability is also reduced. At present, a heating system can be arranged on a power battery, a heating loop is firstly started in a low-temperature charging stage, charging is forbidden, and charging is started after the temperature of the battery system rises. However, the method does not consider the power of the charging pile and the environmental conditions in the charging process, which may cause problems of untimely heating of the lithium ion battery, large energy consumption and the like.
Therefore, the method considers the environmental condition of the charging process, and firstly, the heating strategy is obtained by comparing the current lowest temperature with the preset temperature threshold; then, a first time length and a second time length required for charging from the current state of charge to the target state of charge are respectively obtained according to the battery management system and a preset first temperature rise rate; then, the first temperature rise rate is adjusted according to the comparison result of the second time length and the first time length, the second temperature rise rate is obtained, and the heating time length is obtained according to the second temperature rise rate, the current minimum temperature and the temperature threshold; finally, heating power is obtained according to the second temperature rise rate and the heating duration, and heating treatment is carried out on the battery system according to the heating power, so that the problems that the lithium ion battery is not heated timely, the energy consumption is large and the like in the low-temperature quick charging process of the new energy automobile are solved. In a specific implementation process, the specific time for executing the method may be received by the terminal 102 from the server 104, or a plurality of parameter values in the state and charging process of the battery system of the new energy automobile may be sent from the terminal 102 to the server 104, so that the server 104 issues the specific time for executing the method after receiving the parameter information. The terminal 102 may be, but not limited to, a personal computer, a notebook computer, a smart phone, a tablet computer, a portable wearable device, or a sub-server, and the server 104 may be implemented by a server cluster or a cloud computing platform formed by a plurality of servers or a stand-alone server.
In one embodiment, as shown in fig. 2, a low-temperature rapid charging heating method for a lithium ion battery is provided, which includes the following steps:
s1: acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
s2: acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
s3: comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
s4: and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
Through the steps, the problems that the lithium ion battery is not heated timely, the energy consumption is high and the like in the low-temperature quick charging process of the new energy automobile can be solved.
In order to determine whether the lithium ion battery needs to be heated, in step S1, it is exemplarily illustrated that the current minimum temperature is compared with a preset temperature threshold, and a heating strategy is obtained according to the comparison result, for example, the current minimum temperature of the lithium ion battery may be obtained through a BMS (Battery Management System, a battery management system), then the temperature threshold is preset, preferably, the temperature threshold may be set to-20 ℃, when the current minimum temperature of the lithium ion battery is less than-20 ℃, a heating strategy for heating the lithium ion battery is obtained, in the specific implementation process, the temperature threshold may be adjusted according to the altitude of the environment where the practitioner is located, the temperature and the service life of the lithium ion battery, for example, in order to further ensure timely heating of the lithium ion battery, the temperature threshold may be set to be between-20 ℃ and-18 ℃, when the current minimum temperature of the lithium ion battery belongs to the interval, in order not to affect the charging efficiency of the lithium ion battery, charging of the lithium ion battery may be stopped, only the lithium ion battery may be heated until the current minimum temperature of the lithium ion battery gradually rises and the temperature of-15 ℃ reaches the low charging strategy.
In step S2, it is exemplarily illustrated that, a first time period and a second time period required for charging from a current State Of Charge Of the battery system to a preset target State Of Charge are obtained according to a heating strategy and a first temperature rise rate, for example, when the lithium ion battery needs to be heated, a target State Of Charge (SOC) Of charging a new energy automobile may be set, then, according to an output power Of the charging pile and a required power Of the BMS, an estimated time required to be consumed for charging from the current SOC to the target SOC may be obtained through a message analysis Of the BMS as the first time period, and in some implementation processes, the target SOC may be set to 100%, and may be set to other values according to a requirement Of an implementer, which is not limited herein; the first temperature rising rate is preset, for example, the first temperature rising rate can be set to be 0.5 ℃/min, the temperature of the lithium ion battery is adjusted according to the first temperature rising rate in units of each minute, so that the temperature of the lithium ion battery is increased, the time required to charge from the current SOC to the target SOC is predicted according to the temperature rising curve, the time is used as the second time, in other implementation processes, the initial value of the first temperature rising rate can be set to be a numerical value between 0.4 ℃/min and 0.6 ℃/min, the accuracy of the first temperature rising rate can be adjusted according to the specific model of the battery and the accuracy of the temperature sensor, in this way, the charging time can be predicted from different dimensions, and the heating process of the lithium ion battery can be planned in advance, wherein the temperature is in degrees celsius and the min is in units of minutes.
In order to determine whether the initially set first temperature rise rate meets the charging duration requirement, in step S3, it is exemplarily illustrated that, according to a result of comparing the values of the first duration and the second duration, the first temperature rise rate is adjusted, the second temperature rise rate is obtained, and the heating duration is obtained according to the second temperature rise rate, the current minimum temperature and the temperature threshold value, for example, if the second time period consumed from the current SOC to the target SOC is longer than the first time period when the lithium ion battery is heated according to the first temperature rise rate, it is illustrated that the charging speed of the lithium ion battery is affected by the heating efficiency according to the first temperature rise rate, that is, the charging time is increased, at this time, the value of the first temperature rise rate needs to be properly increased, the second temperature rise rate is obtained, and the lithium ion battery is heated by the higher heating efficiency, and in some implementation processes, the value of the second temperature rise rate can be set to be 0.1 ℃/min greater than the first temperature rise rate, then the value of the current minimum temperature is adjusted until the temperature threshold value is reached, and the required heating duration can be calculated.
After obtaining the suitable second temperature rise rate, the battery system needs to be heated, in step S4, it is exemplarily illustrated that the heating power is obtained according to the second temperature rise rate and the heating duration, and the battery system is heated according to the heating power, for example, after obtaining the second temperature rise rate and the heating duration, various heat generation and heat exchange between the battery system and the charging environment can be calculated, and then how much heat needs to be generated by the heating device and the corresponding heating efficiency are calculated, so that the battery system is heated.
Since the temperature of the lithium ion battery affects the charging efficiency, in some embodiments, as shown in fig. 3, the step of comparing the current minimum temperature with a preset temperature threshold value, and obtaining the heating strategy according to the comparison result includes:
s11: judging whether the current minimum temperature is smaller than a preset first temperature threshold value or not;
s12: if yes, a first heating strategy is obtained;
S13: if not, a second heating strategy is obtained, and whether the current minimum temperature is larger than a preset second temperature threshold value is judged; if yes, a third heating strategy is obtained; if not, a second heating strategy is obtained.
As shown in fig. 3, in steps S11 to S13, the first temperature threshold may be set to a value between-20 degrees celsius and-15 degrees celsius, the second temperature threshold is set to a value between 15 degrees celsius and 25 degrees celsius, then the current minimum temperature is compared with the first temperature threshold, and if the current minimum temperature is smaller than the first temperature threshold, a first heating strategy is obtained, that is, charging of the lithium ion battery should be prohibited at this time, and only the battery is heated; if the current minimum temperature is greater than or equal to the first temperature threshold, a second heating strategy, namely charging and heating at the same time, is obtained; however, as the temperature of the battery increases, it is not possible to continuously heat the battery, so that it is required to determine whether the current minimum temperature is greater than the second temperature threshold, if yes, the third heating strategy is obtained, that is, heating of the battery is stopped, only charging of the battery is performed, if no, the second heating strategy is still obtained, in some implementations, the first temperature threshold and the second temperature threshold may be adjusted according to the value obtained when the current minimum temperature of the battery is obtained for the first time, for example, if the current minimum temperature is less than-20 ℃, the first temperature threshold may be set to-15 ℃, the first heating strategy may be obtained during the period when the current minimum temperature is less than the first temperature threshold, and if the current minimum temperature is greater than-15 ℃, the second heating strategy is obtained as the temperature increases: heating while charging, at this time, the second temperature threshold may be set to 25 degrees celsius, and when the current minimum temperature is greater than-15 degrees celsius and less than 25 degrees celsius, still obtain the second heating strategy: heating while charging, and obtaining a third heating strategy when the current minimum temperature is greater than or equal to 25 ℃: only charging and not heating; in other implementations, if the current minimum temperature of the battery system is greater than or equal to-20 degrees celsius and less than 20 degrees celsius for the first time, the second temperature threshold may be set to 25 degrees celsius, that is, when the current minimum temperature is greater than or equal to-20 degrees celsius and less than 25 degrees celsius, the second heating strategy is acquired until the current minimum temperature is greater than or equal to 25 degrees celsius, at which time the third heating strategy is acquired. By the method, the temperature threshold value can be flexibly adjusted in consideration of the initial temperature of the battery system in charging, and a proper heating strategy can be obtained.
After acquiring the heating strategy, as shown in fig. 4, in some embodiments, the step of acquiring a first time period required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy includes:
s21: judging whether the heating strategy is a second heating strategy or not;
s22: if so, acquiring the first time length required for charging from the current state of charge to the target state of charge through a battery management system.
As shown in fig. 4, in steps S21 to S22, it is exemplarily illustrated that whether the heating strategy is the second heating strategy is determined, for example, when the heating strategy is the second heating strategy, that is, the battery is heated while the battery is charged, the time required for the new energy automobile to charge from the current SOC to the target SOC is obtained through the BMS, as the first period, the first period is affected by the charging power, the BMS required power and the temperature of the battery system, so that the estimated remaining charging time can be directly obtained from the message of the BMS as the first period.
After the first time length is obtained, a second time length required to be consumed for charging from the current SOC to the target SOC under the condition of the current temperature rise rate needs to be judged, and as shown in fig. 5, the step of obtaining the second time length required for charging from the current state of charge to the target state of charge according to the preset first temperature rise rate includes:
s31: acquiring a first voltage, a first current and a first temperature of the battery system at a first moment, adding a plurality of preset time steps to the first moment, and acquiring a plurality of second moments;
s32: acquiring a plurality of second temperatures of the battery system at a plurality of second moments according to the first temperature rise rate and the first temperature; acquiring a plurality of second voltages of the battery system at a plurality of second moments according to the first voltage, the first current and the internal resistance of the battery system;
s33: and obtaining a plurality of second currents according to the second temperatures and the second voltages, obtaining a charging curve according to the second currents, and obtaining a second time length required for charging from the current state of charge to the target state of charge according to the charging curve.
Through the steps, the temperature rise rate can be flexibly adjusted, and the problems that the charging time length is increased due to the too low heating speed and the energy consumption is too high due to the too high heating speed are avoided.
As shown in fig. 5, in steps S31 to S33, it is exemplarily illustrated that a first voltage, a first current and a first temperature of the battery system at a first moment are obtained, and a plurality of preset time steps are added to the first moment, and a plurality of second moments are obtained, for example, starting from the moment when the battery system enters the second heating strategy, as the first moment, the first voltage, the first current and the first temperature of the battery system are obtained at the first moment, then the preset time steps are 1 second, that is, a plurality of 1 second are sequentially added on the basis time of the first moment, so as to form a predicted charging time sequence, that is, a plurality of second moments are formed into a charging time sequence, then a first temperature rise rate is preset, for example, each minute rises by 0.5 ℃, then the expression of the first temperature rise rate is 0.5 ℃/min, then the first temperatures are sequentially increased according to a time value of the plurality of second moments set according to the time steps, a plurality of second temperatures are obtained as the first moments, then a plurality of second temperatures corresponding to the first moments are obtained at the first moment, a plurality of second temperatures are obtained at the first moment, then a plurality of second temperatures corresponding to the first moment are sequentially increased by 1 second time step, that is sequentially increased by a plurality of second temperatures corresponding to the second temperatures are obtained at the second time step, and a plurality of second temperatures corresponding to the second temperatures are obtained at a plurality of time step, and a current rise time of 0.5S, and a current is set to be a specific time, and a current can be estimated to be set to a current, and a current rise time value is set between the second is 0.5 second time, and can be a time, and can be calculated, and a charging time is set to a time, and can be calculated according to a time.
After the second time period is obtained, in order to determine whether the second time period corresponding to the first temperature rise rate meets the requirement, as shown in fig. 6, the step of comparing the second time period with the first time period, adjusting the first temperature rise rate according to a comparison result, obtaining the second temperature rise rate, and obtaining the heating time period according to the second temperature rise rate, the current minimum temperature and the temperature threshold value includes:
s41: judging whether the second time length is longer than the first time length;
s42: if yes, adding the first temperature rise rate and a preset temperature rise step length to obtain the second temperature rise rate;
s43: if not, setting the first temperature rise rate as the second temperature rise rate;
s44: and updating the current minimum temperature according to the second temperature rise rate, acquiring updated current minimum temperature, and recording the heating time length required by the updated current minimum temperature being greater than the temperature threshold as the heating time length.
As shown in fig. 6, in steps S41 to S44, it is exemplarily illustrated that, according to the comparison result of the first duration and the second duration, the second temperature rise rate is obtained, and the battery system is subjected to heating treatment according to the second temperature rise rate, so as to obtain the heating duration, for example, when the second duration is less than or equal to the first duration, it is illustrated that the time taken for charging from the current SOC to the target SOC, which is obtained according to the first temperature rise rate, is less than or equal to the first duration originally estimated, that is, in this case, when the battery system is heated according to the first temperature rise rate, the charging duration may be made to satisfy the requirement, and at this time, the value of the first temperature rise rate is directly set to the second temperature rise rate;
When the second time length is longer than the first time length, the time consumed for charging from the current SOC to the target SOC according to the first temperature rise rate is longer than the originally estimated first time length, namely, in the case, the charging time is increased due to insufficient heating performance of the battery, in order to improve the heating performance, the temperature rise rate is required to be increased, namely, one temperature rise step length is preset, the first temperature rise rate is added with the temperature rise step length, the second temperature rise rate is obtained, whether the updated second time length corresponding to the second temperature rise rate can be smaller than or equal to the first time length is calculated, if the updated second time length is still longer than the first time length, the current second temperature rise rate is still not capable of heating the battery system quickly and effectively, the second temperature rise rate and the temperature rise step length are required to be added, the updated second temperature rise rate is required to be obtained, the updated second time length corresponding to the updated is compared with the first time length continuously, and the current second temperature rise rate is selected to heat the battery system until the second time length is smaller than or equal to the first time length;
after the second temperature rise rate is determined, the current minimum temperature of the battery system can be updated according to the value, and when the updated current minimum temperature is greater than the temperature threshold, namely, the temperature is switched from the second heating strategy to the third heating strategy, the time consumed in the updating period is recorded as the heating time.
In a specific implementation, the step size of the temperature rise may be selected from between 0.1 ℃/min and 0.5 ℃/min.
As shown in fig. 7, the step of obtaining heating power according to the second temperature rise rate and the heating duration, and performing heating treatment on the battery system according to the heating power includes:
s51: acquiring the required heat of the battery system, acquiring the generated heat of the battery system corresponding to the second temperature rise rate, and acquiring the heat dissipation capacity between the battery system corresponding to the second temperature rise rate and a charging environment;
s52: obtaining output heat of the heating device according to the required heat, the generated heat and the heat dissipation, wherein the mathematical expression is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat quantity, Q2 represents the generated heat quantity, Q3 represents the heat radiation quantity, and Q4 represents the output heat quantity;
s53: obtaining the heating power according to the output heat, the preset heat efficiency and the heating duration, wherein the mathematical expression is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating duration.
As shown in fig. 7, in steps S51 to S52, it is exemplarily illustrated that the output heat of the heating device is obtained according to the required heat, the generated heat and the heat dissipation of the battery system, for example, by means of the message analysis of the BMS and the characteristics corresponding to the lithium battery selected by the implementer, the heat required by the battery system during the heating process is obtained as the required heat Q1, and during the heating process, the battery system itself also generates heat as the generated heat Q2, which is expressed mathematically as: q2= Σ (i×i×r×Δt), wherein Δt is a selected time interval, where Δt may be selected to be 1 second, I is a current value corresponding to the current moment, R is an internal resistance value of the battery system, Σ (·) is a summation function, and the heat dissipation Q3 between the battery system and the charging environment may be obtained by calculating a temperature of the battery system and an ambient temperature difference according to a characteristic of the battery, and finally, the heat q4=q1-q2+q3 required to be output by the heating device may be modified to be 0.5 seconds according to a requirement of an embodiment on numerical accuracy in a specific implementation process.
As shown in fig. 7, in step S53, illustratively, the heating power is obtained according to the output heat, the preset thermal efficiency and the heating duration, for example, after the output heat Q4 of the heating device is obtained, the thermal efficiency of the heating device is obtained, and then the product of the thermal efficiency and the heating time is divided by the output heat Q4, so as to obtain the heating power required by the heating device, and then the output of the heating device can be controlled according to the power, where the thermal efficiencies of the heating devices with different models, different specifications and different service lives may be different, and may be selected according to the needs in the specific implementation process,
in order to better consider the relationship between the output power of the charging pile and the allowable charging power of the battery system, as shown in fig. 8, the steps before obtaining the current minimum temperature of the battery system and comparing the current minimum temperature with the preset temperature threshold value further include:
s61: acquiring allowable charging power of the battery system and output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
s62: if yes, keeping the battery system at the current minimum temperature;
S63: if not, the current minimum temperature is obtained, and the current minimum temperature is compared with the temperature threshold.
As shown in fig. 8, in steps S61 to S63, it is exemplarily illustrated that whether to heat the battery system is determined according to a comparison result of the allowable charge power of the battery system and the output power of the charging post, for example, when the output power of the charging post is smaller than the allowable charge power of the battery system, the low-temperature heating is not turned on for the battery system, but only the battery system is charged; when the output power of the charging pile is larger than or equal to the allowable charging power of the battery system, the current minimum temperature of the battery system is obtained, the current minimum temperature is compared with a temperature threshold value, and then a heating strategy is obtained in the subsequent process.
In one embodiment, as shown in fig. 9, there is provided a low-temperature fast-charging heating device for a lithium ion battery, the low-temperature fast-charging heating device for a lithium ion battery comprising:
the heating strategy acquisition module is used for acquiring the current minimum temperature of the battery system, comparing the current minimum temperature with a preset temperature threshold value and acquiring a heating strategy according to a comparison result;
a charging duration obtaining module, configured to obtain a first duration required for charging from a current state of charge of the battery system to a preset target state of charge according to the heating policy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
The heating duration obtaining module is used for comparing the second duration with the first duration, adjusting the first temperature rise rate according to a comparison result, obtaining a second temperature rise rate, and obtaining the heating duration according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and the heating processing module is used for acquiring heating power according to the second temperature rise rate and the heating duration and performing heating processing on the battery system according to the heating power.
In the heating strategy obtaining module, it is exemplarily illustrated that the current minimum temperature is compared with a preset temperature threshold, and according to the comparison result, the heating strategy is obtained, for example, the current minimum temperature of the lithium ion battery can be obtained through the BMS, then the temperature threshold is preset, preferably, the temperature threshold can be set to-20 ℃, when the current minimum temperature of the lithium ion battery is less than-20 ℃, the heating strategy for heating the lithium ion battery is obtained, in the implementation process, the temperature threshold can be adjusted according to the altitude of the environment where the practitioner is located, the temperature and the service life of the lithium ion battery, for example, in order to further ensure timely heating of the lithium ion battery, the temperature threshold can be set to be between-22 ℃ and-18 ℃, when the current minimum temperature of the lithium ion battery belongs to the interval, in order not to affect the charging efficiency of the lithium ion battery, only the lithium ion battery can be stopped from being charged, until the current minimum temperature of the lithium ion battery gradually rises and reaches-15 ℃, and thus the low-temperature in the lithium ion battery can be obtained.
In the charging duration obtaining module, it is exemplarily illustrated that, according to a heating policy and a first temperature rise rate, a first duration and a second duration required for charging from a current state of charge of the battery system to a preset target state of charge are obtained respectively, for example, when the lithium ion battery needs to be heated, the target state of charge of the new energy automobile may be set, then, according to an output power of the charging pile and a required power of the BMS, an estimated time required to be consumed from the current SOC to the target SOC is obtained through message analysis of the BMS, and as the first duration, in some implementation processes, the target SOC may be set to 100%, or may be set to other values according to a requirement of an implementer, which is not limited herein; the first temperature rising rate is preset, for example, the first temperature rising rate can be set to be 0.55 ℃/min, the temperature of the lithium ion battery is adjusted according to the first temperature rising rate in units of each minute, so that the temperature of the lithium ion battery is increased, the time required to charge from the current SOC to the target SOC is predicted according to the temperature rising curve, the time is used as the second time, in other implementation processes, the initial value of the first temperature rising rate can be set to be a numerical value between 0.4 ℃/min and 0.6 ℃/min, the accuracy of the first temperature rising rate can be adjusted according to the specific model of the battery and the accuracy of the temperature sensor, in this way, the charging time can be predicted from different dimensions, and the heating process of the lithium ion battery can be planned in advance, wherein the temperature is in degrees celsius and the min is in units of minutes.
In the heating duration obtaining module, it is exemplarily illustrated that, according to a result of comparing the values of the first duration and the second duration, the first temperature rise rate is adjusted, the second temperature rise rate is obtained, and the heating duration is obtained according to the second temperature rise rate, the current minimum temperature and the temperature threshold, for example, if the second time consumed from the current SOC to the target SOC is longer than the first time when the lithium ion battery is heated according to the first temperature rise rate, it is illustrated that the heating efficiency according to the first temperature rise rate affects the charging speed of the lithium ion battery, that is, the charging time is increased, at this time, the value of the first temperature rise rate needs to be properly increased, the second temperature rise rate is obtained, the lithium ion battery is heated with a higher heating efficiency, and in some implementation processes, the value of the second temperature rise rate can be set to be 0.2 ℃/min greater than the first temperature rise rate, and then the value of the current minimum temperature is adjusted according to the second temperature rise rate until the temperature threshold is reached, at this time, the required heating duration can be calculated, by this means, the initial first temperature rise rate can be adjusted, the charging efficiency is increased, at the same time, the charging efficiency of the lithium ion battery can be properly heated by adopting a suitable system, and the heating efficiency can be further avoided, and the problem of heating due to the high consumption of the heating efficiency can be further avoided.
In the heating processing module, it is exemplarily illustrated that the heating power is obtained according to the second temperature rising rate and the heating duration, and the battery system is heated according to the heating power, for example, after the second temperature rising rate and the heating duration are obtained, various heat generation and heat exchange between the battery system and the charging environment can be calculated, and then how much heat needs to be generated by the heating device and the corresponding heating efficiency are calculated, so that the battery system is heated.
The device can be applied to a scene of heating the lithium ion battery in a low-temperature quick-charging process of the new energy automobile, and a heating strategy is obtained by comparing the current lowest temperature with a preset temperature threshold value; then, a first time length and a second time length required for charging from the current state of charge to the target state of charge are respectively obtained according to the battery management system and a preset first temperature rise rate; then, the first temperature rise rate is adjusted according to the comparison result of the second time length and the first time length, the second temperature rise rate is obtained, and the heating time length is obtained according to the second temperature rise rate, the current minimum temperature and the temperature threshold; and finally, heating power is obtained according to the second temperature rise rate and the heating time length, and the battery system is heated according to the heating power, so that the problems that the lithium ion battery is not heated timely, the energy consumption is high and the like in the low-temperature quick charging process of the new energy automobile are solved.
The specific limitation of the low-temperature fast-charging heating device for the lithium ion battery can be referred to as the limitation of the low-temperature fast-charging heating method for the lithium ion battery, and the description thereof is omitted herein. All or part of each module in the low-temperature quick-charging heating device of the lithium ion battery can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 10. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing the data of each parameter in the low-temperature quick-charging heating process. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by the processor is used for realizing a low-temperature quick-charging heating method of the lithium ion battery.
It will be appreciated by those skilled in the art that the structure shown in FIG. 10 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of when executing the computer program:
acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
And obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The low-temperature quick-charging heating method for the lithium ion battery is characterized by comprising the following steps of:
acquiring the current minimum temperature of a battery system, comparing the current minimum temperature with a preset temperature threshold, and acquiring a heating strategy according to a comparison result;
acquiring a first time length required for charging from the current state of charge of the battery system to a preset target state of charge according to the heating strategy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
Comparing the second time length with the first time length, adjusting the first temperature rise rate according to a comparison result to obtain a second temperature rise rate, and obtaining a heating time length according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and obtaining heating power according to the second temperature rise rate and the heating time, and carrying out heating treatment on the battery system according to the heating power.
2. The method for quickly charging and heating a lithium ion battery at a low temperature according to claim 1, wherein the step of comparing the current minimum temperature with a preset temperature threshold and obtaining a heating strategy according to the comparison result comprises:
judging whether the current minimum temperature is smaller than a preset first temperature threshold value or not;
if yes, a first heating strategy is obtained;
if not, a second heating strategy is obtained, and whether the current minimum temperature is larger than a preset second temperature threshold value is judged; if yes, a third heating strategy is obtained; if not, a second heating strategy is obtained.
3. The method of claim 1, wherein the step of obtaining a first time period required to charge from a current state of charge of the battery system to a preset target state of charge according to the heating strategy comprises:
Judging whether the heating strategy is a second heating strategy or not;
if so, acquiring the first time length required for charging from the current state of charge to the target state of charge through a battery management system.
4. The method according to claim 1, wherein the step of obtaining a second time period required for charging from the current state of charge to the target state of charge according to a preset first rate of temperature rise comprises:
acquiring a first voltage, a first current and a first temperature of the battery system at a first moment, adding a plurality of preset time steps to the first moment, and acquiring a plurality of second moments;
acquiring a plurality of second temperatures of the battery system at a plurality of second moments according to the first temperature rise rate and the first temperature; acquiring a plurality of second voltages of the battery system at a plurality of second moments according to the first voltage, the first current and the internal resistance of the battery system;
and obtaining a plurality of second currents according to the second temperatures and the second voltages, obtaining a charging curve according to the second currents, and obtaining a second time length required for charging from the current state of charge to the target state of charge according to the charging curve.
5. The method of claim 1, wherein comparing the second time period with the first time period, adjusting the first temperature rise rate according to the comparison result, obtaining a second temperature rise rate, and obtaining a heating time period according to the second temperature rise rate, the current minimum temperature, and the temperature threshold comprises:
judging whether the second time length is longer than the first time length;
if yes, adding the first temperature rise rate and a preset temperature rise step length to obtain the second temperature rise rate;
if not, setting the first temperature rise rate as the second temperature rise rate;
and updating the current minimum temperature according to the second temperature rise rate, acquiring updated current minimum temperature, and recording the heating time length required by the updated current minimum temperature being greater than the temperature threshold as the heating time length.
6. The method for quickly charging and heating a lithium ion battery at a low temperature according to claim 1, wherein the step of obtaining heating power according to the second temperature rise rate and the heating duration and performing heating treatment on the battery system according to the heating power comprises the steps of:
Acquiring the required heat of the battery system, acquiring the generated heat of the battery system corresponding to the second temperature rise rate, and acquiring the heat dissipation capacity between the battery system corresponding to the second temperature rise rate and a charging environment;
obtaining output heat of the heating device according to the required heat, the generated heat and the heat dissipation, wherein the mathematical expression is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat quantity, Q2 represents the generated heat quantity, Q3 represents the heat radiation quantity, and Q4 represents the output heat quantity;
obtaining the heating power according to the output heat, the preset heat efficiency and the heating duration, wherein the mathematical expression is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating duration.
7. The method of claim 1, wherein the step of obtaining a current minimum temperature of the battery system and comparing the current minimum temperature with a preset temperature threshold value is further comprised of:
acquiring allowable charging power of the battery system and output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
If yes, keeping the battery system at the current minimum temperature;
if not, the current minimum temperature is obtained, and the current minimum temperature is compared with the temperature threshold.
8. The utility model provides a lithium ion battery low temperature fills heating device soon which characterized in that includes:
the heating strategy acquisition module is used for acquiring the current minimum temperature of the battery system, comparing the current minimum temperature with a preset temperature threshold value and acquiring a heating strategy according to a comparison result;
a charging duration obtaining module, configured to obtain a first duration required for charging from a current state of charge of the battery system to a preset target state of charge according to the heating policy; acquiring a second time length required for charging from the current state of charge to the target state of charge according to a preset first temperature rise rate;
the heating duration obtaining module is used for comparing the second duration with the first duration, adjusting the first temperature rise rate according to a comparison result, obtaining a second temperature rise rate, and obtaining the heating duration according to the second temperature rise rate, the current minimum temperature and the temperature threshold;
and the heating processing module is used for acquiring heating power according to the second temperature rise rate and the heating duration and performing heating processing on the battery system according to the heating power.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the lithium ion battery low temperature fast charge heating method of any one of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor realizes the steps of the lithium ion battery low temperature fast charge heating method according to any one of claims 1 to 7.
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