CN114619925A - 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
CN114619925A
CN114619925A CN202210330798.0A CN202210330798A CN114619925A CN 114619925 A CN114619925 A CN 114619925A CN 202210330798 A CN202210330798 A CN 202210330798A CN 114619925 A CN114619925 A CN 114619925A
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heating
temperature
charging
rise rate
acquiring
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CN114619925B (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-charging heating method, a device, equipment and a storage medium for a lithium ion battery. The method comprises the following steps: acquiring the current lowest temperature of the battery system, comparing the current lowest temperature with a preset temperature threshold, and acquiring a heating strategy according to the comparison result; acquiring a first time length required for charging from the current charge state of the battery system to a preset target charge state according to a heating strategy; acquiring a second time length required for charging from the current charge state to the target charge state 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 to obtain a second temperature rise rate, and obtaining the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold; 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, so that the problems of untimely heating, high 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 thermal management of power batteries of new energy automobiles, in particular to a low-temperature quick-charging heating method, a low-temperature quick-charging heating device, low-temperature quick-charging heating equipment and a low-temperature quick-charging heating storage medium for lithium ion batteries.
Background
With the global continuous attention on energy and environmental protection problems, the new energy automobile industry is rapidly developed. The lithium ion battery is used as a power source of a 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. In all environmental factors, the temperature has the greatest influence on the charge and discharge performance of the lithium ion battery, and although the working temperature range of the lithium ion battery is generally set to be-20 ℃ to 45 ℃, when the working temperature of the lithium ion battery is too low, the performance of the lithium ion battery is reduced, and the charge and discharge capacity is weakened. At present, a heating system can be arranged on the power battery, the heating loop is firstly started and charging is forbidden in a low-temperature charging stage, and charging is started after the temperature of the battery system rises. However, the method does not consider the environmental conditions of the charging process, which may cause the problems of untimely heating of the lithium ion battery, large energy consumption and the like.
Disclosure of Invention
Therefore, it is necessary to provide a method, an apparatus, a device and a storage medium for heating a lithium ion battery at a low temperature and a fast charge, so as to solve the problem of poor heating performance of the lithium ion battery during the charging process.
On one hand, a low-temperature quick-charge heating method for a lithium ion battery is provided, and comprises the following steps:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging from the current charge state of the battery system to a preset target charge state 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating the battery system according to the heating power.
In one embodiment, the step of comparing the current minimum temperature with a preset temperature threshold and obtaining the heating strategy according to the comparison result includes:
judging whether the current lowest temperature is smaller than a preset first temperature threshold value or not;
if so, acquiring a first heating strategy;
if not, acquiring a second heating strategy, and judging whether the current lowest temperature is greater than a preset second temperature threshold value; if so, acquiring a third heating strategy; and if not, acquiring a second heating strategy.
In one embodiment, the step of obtaining the first time period required for charging from the current state of charge of the battery system to the 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 the preset first temperature-rising rate comprises:
acquiring a first voltage, a first current and a first temperature of the battery system at a first moment, and adding a plurality of preset time steps to the first moment to acquire 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 acquiring a plurality of second currents according to the plurality of second temperatures and the plurality of second voltages, acquiring a charging curve according to the plurality of second currents, and acquiring 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 time duration with the first time duration, adjusting the first temperature rise rate according to the comparison result to obtain a second temperature rise rate, and obtaining the heating time duration according to the second temperature rise rate, the current lowest temperature, and the temperature threshold includes:
judging whether the second time length is greater than the first time length or not;
if so, adding the first temperature rise rate and a preset temperature rise step length to obtain a second temperature rise rate;
if not, setting the first temperature rise rate as the second temperature rise rate;
and updating the current lowest temperature according to the second temperature rise rate, acquiring the updated current lowest temperature, and recording the heating time length required by the updated current lowest temperature to be greater than the temperature threshold value as the heating time length.
In one embodiment, the step of obtaining the heating power according to the second temperature rise rate and the heating duration, and the step of performing the heating process 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 the output heat of the heating equipment according to the required heat, the generated heat and the heat dissipation capacity, wherein the mathematical expression of the output heat is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat, Q2 represents the generated heat, Q3 represents the dissipated heat, and Q4 represents the output heat;
obtaining the heating power according to the output heat, the preset heat efficiency and the heating time, wherein the mathematical expression of the heating power is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating time period.
In one embodiment, the step of obtaining the current lowest temperature of the battery system and comparing the current lowest temperature with the preset temperature threshold further includes:
obtaining the allowable charging power of the battery system and the output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
if so, keeping the battery system at the current lowest temperature;
if not, the current lowest temperature is obtained, and the current lowest temperature is compared with the temperature threshold value.
On the other hand, a lithium ion battery low-temperature quick-charging heating device is provided, which comprises:
the heating strategy acquisition module is used for acquiring the current lowest temperature of the battery system, comparing the current lowest temperature with a preset temperature threshold value and acquiring a heating strategy according to the comparison result;
the charging time length acquisition module is used for acquiring a first time length required for charging the current charge state of the battery system to a preset target charge state 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;
a heating duration obtaining module, configured to compare the second duration with the first duration, adjust the first temperature rise rate according to a comparison result, obtain a second temperature rise rate, and obtain a heating duration according to the second temperature rise rate, the current lowest 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 carrying out heating processing on the battery system according to the heating power.
In another aspect, a computer device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the following steps when executing the computer program:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating 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:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating the battery system according to the heating power.
According to the low-temperature quick-charging heating method and device for the lithium ion battery, the computer equipment and the storage medium, firstly, the current lowest temperature is compared with the preset temperature threshold value, so that a heating strategy is obtained; then, acquiring a first time length and a second time length required for charging from the current charge state to the target charge state according to the battery management system and a preset first temperature rise rate respectively; adjusting the first temperature rise rate according to the comparison result of the second time length and the first time length to obtain a second temperature rise rate, and obtaining the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold; and finally, 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, 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.
Drawings
FIG. 1 is a diagram of an application environment of a low-temperature rapid-charging heating method for a lithium ion battery according to an embodiment;
fig. 2 is a schematic flow chart of a low-temperature rapid charging and heating method for a lithium ion battery in an embodiment;
FIG. 3 is a schematic flow chart illustrating an example of obtaining a heating strategy;
FIG. 4 is a flow diagram illustrating obtaining a first duration in one embodiment;
FIG. 5 is a flow diagram illustrating obtaining a second duration in one embodiment;
FIG. 6 is a schematic flow chart of obtaining a heating time period in one embodiment;
FIG. 7 is a schematic flow diagram illustrating a heating process performed on a battery system according to one embodiment;
FIG. 8 is a schematic flow chart diagram illustrating steps prior to obtaining a heating strategy in one embodiment;
fig. 9 is a block diagram of a low-temperature quick-charging heating device of a lithium ion battery in another embodiment;
FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a low-temperature quick-charging heating method for an ion battery, which can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. For example, the low-temperature quick-charging heating method for the ion battery can be applied to a scene that the lithium ion battery is heated in a low-temperature quick-charging process of a new energy automobile, wherein the new energy automobile comprises a PHEV (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 affects the use of the Electric Vehicle. In all environmental factors, the temperature has the greatest influence on the charge and discharge performance of the lithium ion battery, and although the working temperature range of the lithium ion battery is generally set to be-20 ℃ to 45 ℃, when the working temperature of the lithium ion battery is too low, the performance of the lithium ion battery is reduced, and the charge and discharge capacity is weakened. At present, a heating system can be arranged on the power battery, the heating loop is firstly started and charging is forbidden in a low-temperature charging stage, 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 current lowest temperature is compared with a preset temperature threshold value to obtain a heating strategy; then, acquiring a first time length and a second time length required for charging from the current charge state to the target charge state according to the battery management system and a preset first temperature rise rate respectively; adjusting the first temperature rise rate according to a comparison result of the second time length and the first time length to obtain a second temperature rise rate, and obtaining heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold; and finally, acquiring heating power according to the second temperature rise rate and the heating time, and heating the battery system according to the heating power so as to solve the problems of untimely heating of the lithium ion battery, high energy consumption and the like in the low-temperature quick charging process of the new energy automobile. In a specific implementation process, the terminal 102 may receive the specific time for executing the method from the server 104, and may also send the state of the battery system of the new energy vehicle and a plurality of parameter values in the charging process 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, various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices, or sub-servers, and the server 104 may be implemented by an independent server, or a server cluster formed by a plurality of servers, or a cloud computing platform.
In one embodiment, as shown in fig. 2, a low-temperature fast-charging heating method for a lithium ion battery is provided, which includes the following steps:
s1: the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
s2: acquiring a first time length required for charging from the current charge state of the battery system to a preset target charge state 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
s4: and acquiring heating power according to the second temperature rise rate and the heating duration, and heating 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 large 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 policy is obtained according to the comparison result, for example, the current minimum temperature of the lithium ion Battery may be obtained by a BMS (Battery Management System), and then the temperature threshold is preset, preferably, the temperature threshold may be set to-20 degrees celsius, and when the current minimum temperature of the lithium ion Battery is less than-20 degrees celsius, a heating policy for heating the lithium ion Battery is obtained, and in a specific implementation process, the temperature threshold may be adjusted according to an altitude of an environment where an implementer is located, a temperature, and a service life of the lithium ion Battery, for example, to further ensure that the lithium ion Battery is heated in time, the temperature threshold may be set to be between-20 degrees celsius and-18 degrees celsius, when the current lowest temperature of the lithium ion battery belongs to the interval, in order to not influence the charging efficiency of the lithium ion battery, the charging of the lithium ion battery can be stopped, and only the lithium ion battery is heated until the current lowest temperature of the lithium ion battery gradually rises and reaches-15 ℃, so that a heating strategy in the low-temperature quick-charging process of the lithium ion battery is obtained.
Therefore, in step S2, it is exemplarily illustrated that a first time duration and a second time duration required for charging the battery system from the current State Of Charge to the preset target State Of Charge are obtained according to the heating strategy and the first temperature rise rate, respectively, for example, when the lithium ion battery needs to be heated, a target State Of Charge (SOC) for charging the new energy vehicle may be set, and then an estimated time required to be consumed for charging the battery system from the current SOC to the target SOC is obtained through a message analysis Of the BMS according to an output power Of the charging pile and a required power Of the BMS, as the first time duration, in some embodiments, the target SOC may be set to 100%, and may also be set to other values according to a requirement Of an implementer, which is not limited herein; then, a first temperature rise rate is preset, for example, the first temperature rise rate can be set to 0.5 ℃/min, the temperature of the lithium ion battery is adjusted according to the first temperature rise rate by taking the temperature of the lithium ion battery as a unit per minute, so that the temperature of the lithium ion battery is raised, the time consumed for charging from the current SOC to the target SOC is predicted according to the temperature rise curve and is used as a second time length, in other implementations, the initial value of the first ramp rate may also be set to a value between 0.4 ℃/min and 0.6 ℃/min, and the accuracy of the first rate of temperature rise can also be adjusted according to the specific model of the battery and according to the accuracy of the temperature sensor, in this way, the charging time can be predicted from different dimensions, so that the heating process of the lithium ion battery is planned in advance, wherein the temperature is in centigrade degrees, and the min is in minutes.
In order to determine whether the initially set first temperature-rise rate meets the requirement of the charging duration, in step S3, illustratively, the first temperature-rise rate is adjusted according to a numerical comparison result between the first duration and the second duration to obtain a second temperature-rise rate, 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 duration consumed by charging the lithium ion battery from the current SOC to the target SOC when the lithium ion battery is heated according to the first temperature-rise rate is greater than the first duration, it is indicated that the charging speed of the lithium ion battery is affected by the heating efficacy 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 increased appropriately to obtain the second temperature-rise rate, the lithium ion battery is heated with a higher heating efficacy, in some implementations, the value of the second temperature-rise rate may be set to be greater than the first temperature-rise rate by 0.1 ℃/min, and then adjusting the numerical value of the current lowest temperature according to the second temperature rise rate until the temperature reaches a temperature threshold value, and calculating the required heating time length at the moment.
After the appropriate second temperature rise rate is obtained, the battery system needs to be heated, in step S4, it is exemplarily illustrated that 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 the second temperature rise 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 is generated by the heating device and the corresponding heating efficiency are calculated, so as to heat the battery system.
Since the temperature of the lithium ion battery may affect the charging efficiency, in some embodiments, as shown in fig. 3, the step of comparing the current minimum temperature with a preset temperature threshold and obtaining the heating policy according to the comparison result includes:
s11: judging whether the current lowest temperature is smaller than a preset first temperature threshold value or not;
s12: if so, acquiring a first heating strategy;
s13: if not, acquiring a second heating strategy, and judging whether the current lowest temperature is greater than a preset second temperature threshold value; if so, acquiring a third heating strategy; and if not, acquiring a second heating strategy.
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 may be set to a value between 15 degrees celsius and 25 degrees celsius, then the current lowest temperature is compared with the first temperature threshold, and if the current lowest temperature is smaller than the first temperature threshold, the first heating policy is obtained, that is, at this time, charging of the lithium ion battery should be prohibited, and only the battery should be heated; if the current lowest temperature is greater than or equal to the first temperature threshold, acquiring a second heating strategy, namely heating while charging; however, as the temperature of the battery rises, the battery cannot be heated continuously, so that it is necessary to determine whether the current minimum temperature is greater than the second temperature threshold, if so, a third heating strategy is obtained, namely, the heating of the battery is stopped, only the battery is charged, if not, the second heating strategy is still obtained, in some implementations, the first and second temperature thresholds may be adjusted based on the value obtained when the current minimum temperature of the battery is first obtained, if the current minimum temperature is less than-20 degrees celsius, for example, the first temperature threshold may be set to-15 degrees celsius, the first heating strategy may be acquired during the time that the current minimum temperature is less than the first temperature threshold, and as the temperature increases, when the current lowest temperature is higher than equal-15 ℃, a second heating strategy is obtained: charging while heating, setting the second temperature threshold to 25 ℃ at this time, and when the current lowest temperature is greater than-15 ℃ and less than 25 ℃, still obtaining a second heating strategy: charging while heating, and acquiring a third heating strategy when the current lowest temperature is more than or equal to 25 ℃: charging only and not heating; in other implementations, if the current lowest temperature of the battery system is obtained for the first time and is greater than or equal to-20 degrees celsius and less than 20 degrees celsius, the second temperature threshold may be set to 25 degrees celsius, that is, when the current lowest temperature is greater than or equal to-20 degrees celsius and less than 25 degrees celsius, the second heating strategy is obtained until the current lowest temperature is greater than or equal to 25 degrees celsius, and at this time, the third heating strategy is obtained. By the method, the temperature threshold value can be flexibly adjusted in consideration of the initial charging temperature of the battery system, and a proper heating strategy is obtained.
After the heating strategy is obtained, as shown in fig. 4, in some embodiments, the step of obtaining the first time period required for charging the battery system from the current state of charge to the 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 through S22, it is exemplarily explained that it is determined whether the heating strategy is the second heating strategy, for example, when the heating strategy is the second heating strategy, that is, the battery is heated while being charged, and the time consumed by the new energy automobile from the current SOC to the target SOC is acquired by the BMS as a first time period affected by the charge-to-power, the BMS required power, and the temperature of the battery system, it is possible to directly acquire the estimated remaining charging time from the message of the BMS as the first time period, in the method, the subsequent heating time and heating efficacy need to be reasonably planned mainly aiming at the condition of heating while charging, so that only the condition of the second heating strategy is explained, and for the first heating strategy, only heating is carried out and charging is not carried out, and for the third heating strategy, only charging is carried out and heating is not carried out.
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 at 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 a 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, and adding a plurality of preset time steps to the first moment to acquire 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 acquiring a plurality of second currents according to the plurality of second temperatures and the plurality of second voltages, acquiring a charging curve according to the plurality of second currents, and acquiring 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 is prolonged and the energy consumption is overlarge due to the fact that the heating speed is too low and the heating speed is too high are solved.
As shown in fig. 5, in steps S31 to S33, it is exemplarily illustrated that a first voltage, a first current, a first temperature of the battery system at a first time are obtained, and the first time is added with a plurality of preset time steps, a plurality of second times are obtained, for example, from a time when the battery system enters a second heating strategy, as the first time, a first voltage, a first current, and a first temperature of the battery system are obtained at the first time, and then a time step of 1 second may be preset, that is, a plurality of 1 seconds are sequentially added on a base time of the first time, to form a predicted charging time sequence, that is, a plurality of second times form the charging time sequence, and then a first temperature rise rate is preset, for example, 0.5 degrees celsius per minute, an expression of the first temperature rise rate is 0.5 ℃/min, and then according to time values of the plurality of second times set according to time, the first temperature is sequentially increased according to 0.5 ℃/min to obtain a plurality of second temperatures, a plurality of second voltages corresponding to a plurality of second moments are obtained, a plurality of corresponding second currents are obtained through the plurality of second temperatures and the plurality of second voltages, a charging curve can be formed according to the plurality of second currents, and estimated time consumed from the current SOC to the target SOC is calculated according to the charging curve and used as a second duration.
After the second duration is obtained, in order to determine whether the second duration corresponding to the first temperature rise rate meets the requirement, as shown in fig. 6, the step of comparing the second duration with the first duration, adjusting the first temperature rise rate according to the 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:
s41: judging whether the second time length is greater than the first time length or not;
s42: if so, adding the first temperature rise rate and a preset temperature rise step length to obtain a second temperature rise rate;
s43: if not, setting the first temperature rise rate as the second temperature rise rate;
s44: and updating the current lowest temperature according to the second temperature rise rate, acquiring the updated current lowest temperature, and recording the heating time length of the updated current lowest temperature which is greater than the temperature threshold value as the heating time length.
As shown in fig. 6, in steps S41 to S44, it is exemplarily illustrated that the second temperature-rise rate is obtained according to the comparison result of the first time duration and the second time duration, and the heating process is performed on the battery system according to the second temperature-rise rate, so as to obtain the heating time duration, for example, when the second time duration is equal to or less than the first time duration, it is illustrated that the time consumed for charging the battery system from the current SOC to the target SOC, which is obtained according to the first temperature-rise rate, is equal to or less than the originally estimated first time duration, that is, in this case, when the battery system is heated according to the first temperature-rise rate, the charging time duration can be made to meet the requirement, and then the value of the first temperature-rise rate is directly set as the second temperature-rise rate;
when the second duration is longer than the first duration, it is described that the time consumed for charging from the current SOC to the target SOC, which is obtained according to the first temperature rise rate, is longer than the originally estimated first duration, that is, in this case, the charging time is increased due to insufficient heating performance of the battery, at this time, in order to improve the heating performance, the temperature rise rate needs to be increased, that is, a temperature rise step length is preset, the temperature rise step length is added to the first temperature rise rate, so as to obtain a second temperature rise rate, then whether the updated second duration corresponding to the second temperature rise rate can be less than or equal to the first duration is calculated, if the updated second duration is still longer than the first duration, it is considered that the current second temperature rise rate still cannot rapidly and effectively heat the battery system, and the second temperature rise rate needs to be further added to the temperature rise step length, so as to obtain the updated second temperature rise rate, continuously comparing the updated second time length corresponding to the updated second temperature rise rate with the first time length until the second time length is less than or equal to the first time length, and selecting the current second temperature rise rate to heat the battery system;
after the second temperature rise rate is determined, the current lowest temperature of the battery system can be updated according to the value, and when the updated current lowest temperature is greater than the temperature threshold value, namely, when the second heating strategy is switched to the third heating strategy, the time length consumed in the updating period is recorded and used as the heating time length.
In a specific implementation, the temperature rise step size can be selected from 0.1 ℃/min to 0.5 ℃/min.
As shown in fig. 7, the step of obtaining the heating power according to the second temperature rise rate and the heating duration, and performing the heating process 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 the output heat of the heating equipment according to the required heat, the generated heat and the heat dissipation capacity, wherein the mathematical expression of the output heat is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat, Q2 represents the generated heat, Q3 represents the dissipated heat, and Q4 represents the output heat;
s53: obtaining the heating power according to the output heat, the preset heat efficiency and the heating time, wherein the mathematical expression of the heating power is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating time period.
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, the heat required by the battery system during the heating process is obtained as the required heat Q1 through the message parsing of the BMS and the corresponding characteristic of the lithium battery selected by the implementer, and the battery system itself also generates heat as the generated heat Q2, which is mathematically expressed as: q2 ═ Σ (I × R Δ t), where Δ t is a selected time interval, where Δ t may be selected to be 1 second, I is a current value corresponding to the current time, R is an internal resistance value of the battery system, Σ (·) is a summation function, and a heat dissipation amount Q3 between the battery system and the charging environment may be obtained by calculating a difference between the temperature of the battery system and the ambient temperature according to the characteristics of the battery, and finally, the heat amount Q4 that the heat generating device needs to output is Q1-Q2+ Q3, and Δ t may also be modified to be 0.5 second according to the requirement of the implementer for numerical accuracy in a specific implementation process.
As shown in fig. 7, in step S53, it is exemplarily illustrated that the heating power is obtained according to the output heat, the preset heating efficiency and the heating time, for example, after the output heat Q4 of the heating device is obtained, the heating efficiency of the heating device is obtained, then the output heat Q4 is divided by the product of the heating efficiency and the heating time, 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, wherein the heating efficiency of the heating device with different models, different specifications and different service lives may have differences, and can be selected as required 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, a current minimum temperature of the battery system is obtained, and the step before comparing the current minimum temperature with the preset temperature threshold further includes:
s61: obtaining the allowable charging power of the battery system and the output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
s62: if so, keeping the battery system at the current lowest temperature;
s63: if not, the current lowest temperature is obtained, and the current lowest temperature is compared with the temperature threshold value.
As shown in fig. 8, in steps S61 to S63, it is exemplarily explained that whether to heat the battery system is determined according to the comparison result between the allowable charging power of the battery system and the output power of the charging post, for example, when the output power of the charging post is less than the allowable charging 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 lowest temperature of the battery system is obtained, the current lowest 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 and fast-charge heating device for a lithium ion battery, the low-temperature and fast-charge heating device for a lithium ion battery comprising:
the heating strategy acquisition module is used for acquiring the current lowest temperature of the battery system, comparing the current lowest temperature with a preset temperature threshold value and acquiring a heating strategy according to the comparison result;
the charging time length acquisition module is used for acquiring a first time length required for charging the current charge state of the battery system to a preset target charge state 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;
a heating duration obtaining module, configured to compare the second duration with the first duration, adjust the first temperature rise rate according to a comparison result, obtain a second temperature rise rate, and obtain a heating duration according to the second temperature rise rate, the current lowest 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 carrying out heating processing on the battery system according to the heating power.
In the heating policy obtaining module, it is exemplarily illustrated that the current minimum temperature is compared with a preset temperature threshold, a heating policy is obtained according to the comparison result, for example, the current minimum temperature of the lithium ion battery may be obtained through the BMS, then the temperature threshold is preset, preferably, the temperature threshold may be set to-20 degrees celsius, a heating policy for heating the lithium ion battery is obtained when the current minimum temperature of the lithium ion battery is less than-20 degrees celsius, the temperature threshold may be adjusted according to the altitude and the temperature of the environment where the implementer is located and the service life of the lithium ion battery in the specific implementation process, for example, to further ensure timely heating of the lithium ion battery, the temperature threshold may be set to-22 degrees celsius to-18 degrees celsius, when the current lowest temperature of the lithium ion battery belongs to the interval, in order to not influence the charging efficiency of the lithium ion battery, the charging of the lithium ion battery can be stopped, and only the lithium ion battery is heated until the current lowest temperature of the lithium ion battery gradually rises and reaches-15 ℃, so that a heating strategy in the low-temperature quick-charging process of the lithium ion battery is obtained.
In the charging duration obtaining module, illustratively, a first duration and a second duration required for charging from the 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, the target state of charge for charging the new energy vehicle may be set, then, according to the output power of the charging pile and the required power of the BMS, an estimated time required to be consumed for charging from the current SOC to the target SOC is obtained through message analysis of the BMS, and is taken as the first duration, in some implementation processes, the target SOC may be set to 100%, and may also be set to other values according to the needs of an implementer, which is not limited herein; the first temperature rise rate is preset, and may be set to 0.55 deg.c/min for example, adjusting the temperature of the lithium ion battery according to the first temperature rise rate and the unit of every minute so as to enable the temperature of the lithium ion battery to rise, predicting the time consumed by charging from the current SOC to the target SOC according to the temperature rise curve as a second time length, in other implementations, the initial value of the first ramp rate may also be set to a value between 0.4 ℃/min and 0.6 ℃/min, and the accuracy of the first rate of temperature rise can also be adjusted according to the specific model of the battery and according to the accuracy of the temperature sensor, in this way, the charging time can be predicted from different dimensions, so that the heating process of the lithium ion battery is planned in advance, wherein the temperature is in centigrade degrees, and the min is in minutes.
In the heating duration obtaining module, it is exemplarily illustrated that the first temperature-rise rate is adjusted according to a numerical comparison result between the first duration and the second duration to obtain the second temperature-rise rate, 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 duration consumed for charging the lithium ion battery from the current SOC to the target SOC when the lithium ion battery is heated according to the first temperature-rise rate is greater than the first duration, it is illustrated that the charging speed of the lithium ion battery is affected according to the heating efficacy of the first temperature-rise rate, that is, the charging time is increased, at this time, the numerical value of the first temperature-rise rate needs to be increased appropriately to obtain the second temperature-rise rate, the lithium ion battery is heated with a higher heating efficacy, in some embodiments, the numerical value of the second temperature-rise rate may be set to be greater than the first temperature-rise rate by 0.2 ℃/min, and then adjusting the numerical value of the current lowest temperature according to the second temperature rise rate until the temperature reaches a temperature threshold value, and calculating the required heating time length at the moment.
In the heating processing module, 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 the second temperature rise rate and the heating duration are obtained, various heat generation and heat exchange between the battery system and the charging environment and the battery system can be calculated, and then how much heat is generated by the heating device and the corresponding heating efficiency are calculated, so as to heat the battery system.
The device can be applied to a scene that the lithium ion battery is heated in the 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, acquiring a first time length and a second time length required for charging from the current charge state to the target charge state according to the battery management system and a preset first temperature rise rate respectively; adjusting the first temperature rise rate according to the comparison result of the second time length and the first time length to obtain a second temperature rise rate, and obtaining the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold; and finally, 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, 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.
For specific limitations of the low-temperature and fast-charge heating device for the lithium ion battery, reference may be made to the above limitations of the low-temperature and fast-charge heating method for the lithium ion battery, and details are not repeated here. 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 modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram 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 comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing 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 is executed by a processor to realize the low-temperature quick-charging heating method of the lithium ion battery.
Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain 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 following steps when executing the computer program:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating 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:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating the battery system according to the heating power.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile 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 (Synchlink) DRAM (SLDRAM), Rambus (Rambus) direct RAM (RDRAM), direct bused dynamic RAM (DRDRAM), and bused dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A low-temperature quick-charging heating method for a lithium ion battery is characterized by comprising the following steps:
the method comprises the steps of obtaining the current lowest temperature of a battery system, comparing the current lowest temperature with a preset temperature threshold value, and obtaining a heating strategy according to the comparison result;
acquiring a first time length required for charging 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 the heating time length according to the second temperature rise rate, the current lowest temperature and the temperature threshold;
and acquiring heating power according to the second temperature rise rate and the heating duration, and heating the battery system according to the heating power.
2. The lithium ion battery low-temperature quick-charging heating method according to claim 1, wherein the step of comparing the current lowest temperature with a preset temperature threshold and obtaining a heating strategy according to the comparison result comprises:
judging whether the current lowest temperature is smaller than a preset first temperature threshold value or not;
if so, acquiring a first heating strategy;
if not, acquiring a second heating strategy, and judging whether the current lowest temperature is greater than a preset second temperature threshold value; if so, acquiring a third heating strategy; and if not, acquiring a second heating strategy.
3. The lithium ion battery low-temperature rapid-charging heating method according to claim 1, wherein the step of obtaining the first time period required for charging from the current state of charge of the battery system to the 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 lithium ion battery low-temperature rapid-charging heating method according to claim 1, wherein 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 comprises:
acquiring a first voltage, a first current and a first temperature of the battery system at a first moment, and adding a plurality of preset time steps to the first moment to acquire 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 acquiring a plurality of second currents according to the plurality of second temperatures and the plurality of second voltages, acquiring a charging curve according to the plurality of second currents, and acquiring 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 lithium ion battery low-temperature quick-charging heating method according to claim 1, wherein the step of comparing the second time duration with the first time duration, adjusting the first temperature rise rate according to the comparison result to obtain a second temperature rise rate, and obtaining the heating time duration according to the second temperature rise rate, the current lowest temperature and the temperature threshold comprises:
judging whether the second time length is greater than the first time length or not;
if so, adding the first temperature rise rate and a preset temperature rise step length to obtain a second temperature rise rate;
if not, setting the first temperature rise rate as the second temperature rise rate;
and updating the current lowest temperature according to the second temperature rise rate, acquiring the updated current lowest temperature, and recording the heating time length of the updated current lowest temperature which is greater than the temperature threshold value as the heating time length.
6. The lithium ion battery low-temperature rapid charging and heating method according to claim 1, wherein heating power is obtained according to the second temperature rise rate and the heating duration, and the step of performing heating processing on the battery system according to the heating power comprises the following steps:
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 the output heat of the heating equipment according to the required heat, the generated heat and the heat dissipating capacity, wherein the mathematical expression of the output heat is as follows:
Q4＝Q1-Q2+Q3
wherein Q1 represents the required heat, Q2 represents the generated heat, Q3 represents the dissipated heat, and Q4 represents the output heat;
obtaining the heating power according to the output heat, the preset heat efficiency and the heating time, wherein the mathematical expression of the heating power is as follows:
P＝Q4/(η*t)
wherein P represents the heating power, η represents the thermal efficiency, and t represents the heating time period.
7. The lithium ion battery low-temperature quick-charging heating method according to claim 1, wherein the step of obtaining a current lowest temperature of a battery system and comparing the current lowest temperature with a preset temperature threshold further comprises:
obtaining the allowable charging power of the battery system and the output power of a charging pile, and judging whether the output power is smaller than the allowable charging power;
if so, keeping the battery system at the current lowest temperature;
if not, the current lowest temperature is obtained, and the current lowest temperature is compared with the temperature threshold value.
8. The utility model provides a lithium ion battery low temperature is heating device that fills soon which characterized in that includes:
the heating strategy acquisition module is used for acquiring the current lowest temperature of the battery system, comparing the current lowest temperature with a preset temperature threshold value and acquiring a heating strategy according to the comparison result;
the charging time length acquisition module is used for acquiring a first time length required for charging the current charge state of the battery system to a preset target charge state 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;
a heating duration obtaining module, configured to compare the second duration with the first duration, adjust the first temperature rise rate according to a comparison result, obtain a second temperature rise rate, and obtain a heating duration according to the second temperature rise rate, the current lowest 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 carrying out 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 in the memory and executable on the processor, wherein the processor implements the steps of the method for heating a lithium ion battery by low-temperature and fast charge as claimed in any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the low-temperature fast-charge heating method for a lithium ion battery according to any one of claims 1 to 7.
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Cited By (6)

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