CN112114258B - Method and device for estimating available capacity of power battery, medium and equipment - Google Patents

Method and device for estimating available capacity of power battery, medium and equipment Download PDF

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Publication number
CN112114258B
CN112114258B CN202010916786.7A CN202010916786A CN112114258B CN 112114258 B CN112114258 B CN 112114258B CN 202010916786 A CN202010916786 A CN 202010916786A CN 112114258 B CN112114258 B CN 112114258B
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charge
power battery
state
available capacity
capacity
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CN112114258A (en
Inventor
张帅领
王婷
张宇
王皓泽
王晓鸣
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Beijing Hyundai Motor Co Ltd
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Beijing Hyundai Motor Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • 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]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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

Abstract

The disclosure relates to a method and a device for estimating available capacity of a power battery, a medium and equipment. The method comprises the following steps: screening the external charge state of the power battery, which is sent outwards by the vehicle in a quick charge process, from historical state data of the vehicle; determining an internal estimated state of charge of the power battery estimated inside the vehicle corresponding to the external state of charge, wherein the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween; and estimating the available capacity of the power battery according to the internal estimated state of charge. Compared with the external power generation state of charge, the internal estimated state of charge is closer to the actual state of charge, so that the estimated available capacity of the power battery is more accurate, necessary supervision measures can be taken on the power battery in time, the user experience is improved, and an accurate basis is provided for researching the influence of user behaviors and environment on the power battery.

Description

Method and device for estimating available capacity of power battery, medium and equipment
Technical Field
The disclosure relates to the field of electric vehicle monitoring, in particular to a method and a device for estimating available capacity of a power battery, a medium and equipment.
Background
In recent years, electric vehicles have been attracting more and more attention as new energy vehicles in order to cope with environmental and energy crisis. Power cells are one of the key components of electric vehicles, and power cell technology greatly affects the performance and cost of electric vehicles. At present, the range gap between an electric vehicle and a traditional vehicle is gradually shortened.
However, due to the influence of factors such as ambient temperature, running condition, charging behavior, service time and the like, the actual available capacity of the power battery is greatly different from the rated capacity. The actual available capacity of the power battery directly influences the endurance mileage performance, the evaluation of the residual value of the new energy second hand vehicle and the subsequent echelon high-efficiency utilization of the power battery recovery link. Accordingly, in the course of improving the overall performance of electric vehicles and advancing toward industrialization, estimation of the available capacity of the power battery is receiving more and more attention from users. The method accurately estimates the available capacity of the power battery of the electric vehicle after the electric vehicle is used for a period of time, provides reference answers for solving complaints of continuous voyage mileage decay of users, lack of standards for secondary vehicle residual value evaluation, lack of technical basis for subsequent echelon efficient utilization of the power battery and other industry pain points, and is also an important subject for improving the popularity of the electric vehicle and promoting the sustainable development of the electric vehicle industry in a period of time in the future.
Disclosure of Invention
The purpose of the present disclosure is to provide a reliable and accurate available capacity estimation method and device, medium and equipment of a power battery.
In order to achieve the above object, the present disclosure provides a method of estimating the available capacity of a power battery, the method comprising:
screening the external charge state of the power battery, which is sent outwards by the vehicle in a quick charge process, from historical state data of the vehicle;
determining an internal estimated state of charge of the power battery estimated inside the vehicle corresponding to the external state of charge, wherein the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween;
and estimating the available capacity of the power battery according to the internal estimated state of charge.
Optionally, screening the external charge state of the power battery sent outwards by the vehicle in a quick charge process from the historical state data of the vehicle includes: screening the outward charge state of the power battery, which is sent outward by the vehicle in the primary charging process meeting the following conditions, from historical state data of the vehicle:
the charging current of the power battery is greater than a predetermined current threshold;
the temperature of the power battery is within a predetermined temperature range;
the charging time length of the power battery is longer than a preset time length;
the external state of charge of the power cell is within a predetermined state of charge range;
the difference between the external charge state of the power battery after charging and the external charge state before charging is larger than a preset charge state.
Optionally, estimating the available capacity of the power battery according to the internal estimated state of charge includes:
determining a difference between the internal estimated state of charge after charging of the power battery and the internal estimated state of charge before charging;
calculating the charge capacity of the power battery;
and calculating the available capacity of the power battery according to the charging capacity and the difference value.
Alternatively, calculating the available capacity of the power battery from the charge capacity and the difference is performed by the following formula:
C2＝C1/ΔSOC inner part
Wherein C2 is the available capacity of the power battery, C1 is the charging capacity, and delta SOC Inner part Is the difference.
Optionally, the method further comprises: screening the temperature of the power battery in the quick charge process from the historical state data of the vehicle;
estimating the available capacity of the power cell based on the internal estimated state of charge, comprising: and estimating the available capacity of the power battery equivalent to a preset temperature according to the internal estimated charge state and the temperature of the power battery in the quick charge process.
Optionally, estimating the available capacity of the power battery equivalent to a predetermined temperature according to the internal estimated state of charge and the temperature of the power battery during the fast charge includes:
determining a difference between the internal estimated state of charge of the power battery after charging and the internal estimated state of charge before charging;
calculating the charge capacity of the power battery;
calculating a reference capacity of the power battery according to the charging capacity and the difference value;
calculating an average temperature value of the power battery in the quick charge process;
and calculating the available capacity of the power battery equivalent to the preset temperature according to the reference capacity and the average temperature value.
Optionally, calculating the available capacity of the power battery equivalent to a predetermined temperature according to the reference capacity and the average temperature value includes:
determining a correction coefficient according to the average temperature value;
the available capacity of the power cell equivalent to a predetermined temperature is calculated according to the following formula:
C3＝C0/(1+ρ)
C0＝C1/ΔSOC inner part
Wherein ρ is the correction coefficient, C0 is the reference capacity, C3 is the available capacity of the power battery equivalent to a predetermined temperature, C1 is the charge capacity, ΔSOC Inner part Is the difference.
The present disclosure also provides an available capacity estimation apparatus of a power battery, the apparatus including:
the screening module is used for screening the outward charge state of the power battery, which is sent outward by the vehicle in one quick charge process, from the historical state data of the vehicle;
a determining module configured to determine an internal estimated state of charge of the power battery estimated inside the vehicle, corresponding to the external state of charge, where the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween;
and the estimation module is used for estimating the available capacity of the power battery according to the internal estimated state of charge.
The present disclosure also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the above-described method provided by the present disclosure.
The present disclosure also provides an electronic device, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the above method provided by the present disclosure.
By the technical scheme, the state of charge (internal estimated state of charge) of the power battery estimated in the vehicle is used for replacing the state of charge (external state of charge) of the power battery sent outwards by the vehicle, so that the available capacity of the power battery is estimated. Compared with the external power generation state of charge, the internal estimated state of charge is closer to the actual state of charge, so that the estimated available capacity of the power battery is more accurate, necessary supervision measures can be taken on the power battery in time, the user experience is improved, and an accurate basis is provided for researching the influence of user behaviors and environment on the power battery.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart of a method of estimating the available capacity of a power cell provided by an exemplary embodiment;
FIG. 2 is a scene graph of acquiring status data of a vehicle provided by an illustrative example;
FIG. 3 is a graph of the correspondence between the internal estimated state of charge and the external state of charge provided by an exemplary example;
FIG. 4 is a block diagram of an exemplary power cell available capacity estimation apparatus;
fig. 5 is a block diagram of an electronic device, as shown in an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a flowchart of a method of estimating the available capacity of a power battery according to an exemplary embodiment. As shown in fig. 1, the method may include the following steps.
Step S11, the external charge state of the power battery, which is sent outwards by the vehicle in a quick charge process, is screened out from the historical state data of the vehicle.
Step S12, determining an internal estimated state of charge of the power battery estimated inside the vehicle, corresponding to the external state of charge, wherein the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween.
Step S13, the available capacity of the power battery is estimated according to the internal estimated state of charge.
The status data of the vehicle may be collected by various controllers in the vehicle, such as a whole vehicle controller, a motor controller, and a battery management system (Battery Management System, BMS), among others. A remote monitoring terminal (T-box) CAN be arranged in the vehicle and is mounted in a vehicle CAN network. The T-box may obtain status data from the vehicle and package it for transmission over a wireless network to a remote monitoring enterprise platform (server). After receiving the message information (state data) uploaded by the remote monitoring terminal, the server can send the message information to other platforms, and can store the message for user inquiry and downloading.
FIG. 2 is a scene graph of acquiring status data of a vehicle provided by an illustrative example. As shown in fig. 2, communication between the vehicle 10 and the server 20 may be performed wirelessly. The server 20 may have stored therein historical state data of the vehicle. An offline data access and analysis interface may be provided in the server 20, and in this embodiment, historical state data of the vehicle stored in the server 20 may be obtained through the interface of the server 20.
Most electric vehicles have two charging modes, one is fast charging and one is slow charging. The fast charge is a direct current charge and the slow charge is an alternating current charge. The vehicle may also send vehicle status data out during a quick-fill.
The state of charge (SOC) of the vehicle (BMS) that is externally transmitted (the externally transmitted SOC), that is, the SOC that is uploaded to the server, is not associated with the SOC (internally estimated state of charge) estimated inside the BMS. The external charge state and the internal estimated charge state of the power battery of the pure electric vehicle are not completely synchronously displayed at present due to the consideration of power battery protection and user prompt experience. Fig. 3 is a graph of the correspondence between the internal estimated state of charge and the external generated state of charge provided by an exemplary example. As shown in fig. 3, the relationship between the internal estimated state of charge and the external generated state of charge can be expressed as the following formula:
wherein SOC is Outer part To the external charge state, SOC Inner part To internally estimate the state of charge, f (·) is a function.
The corresponding relation between the internal estimated charge state and the external generated charge state of a vehicle is a design characteristic of the vehicle model development stage, is fixed and unchanged, and can be stored in advance. The state of charge of the power battery obtained from the server is the outgoing state of charge. According to the corresponding relation between the pre-stored internal estimated state of charge and the external state of charge, the internal estimated state of charge corresponding to an external state of charge can be determined by means of table look-up or conversion, and then the available capacity of the power battery is estimated according to the internal estimated state of charge.
By the technical scheme, the state of charge (internal estimated state of charge) of the power battery estimated in the vehicle is used for replacing the state of charge (external state of charge) of the power battery sent outwards by the vehicle, so that the available capacity of the power battery is estimated. Compared with the external power generation state of charge, the internal estimated state of charge is closer to the actual state of charge, so that the estimated available capacity of the power battery is more accurate, necessary supervision measures can be taken on the power battery in time, the user experience is improved, and an accurate basis is provided for researching the influence of user behaviors and environment on the power battery.
In still another embodiment, the step of screening the external power state of charge of the power battery, which is transmitted to the outside of the vehicle during one fast charge, from the historical state data of the vehicle (step S11) may include: and screening the outward charge state of the power battery which is sent outward by the vehicle in the primary charging process meeting the following conditions from the historical state data of the vehicle:
1) The charging current of the power battery is greater than a predetermined current threshold;
2) The temperature of the power battery is within a predetermined temperature range;
3) The charging time period of the power battery is longer than a preset time period;
4) The external charge state of the power battery is within a predetermined charge state range;
5) The difference between the external charge state of the power battery after charging and the external charge state before charging is greater than a predetermined charge state.
Since the charge current of the fast charge is greater than the charge current of the slow charge, the predetermined current threshold may be set to be greater than the charge current of the slow charge and less than the charge current of the fast charge, e.g., 80A. Thus, when the charging current of the power battery is greater than the predetermined current threshold, the power battery can be considered to be currently in a fast-charge state.
If the temperature of the power battery is within the preset temperature range, the power battery can be considered to be at a more reasonable temperature, and the state data in the charging process can be used as a basis for estimating the available capacity of the power battery. The predetermined temperature range may be empirically obtained, for example, from 5 ℃ to 30 ℃.
If the charging time of the power battery is longer than the preset time, the charging of the power battery can be considered to be complete, and the state data in the charging can be used as a basis for estimating the available capacity of the power battery. The predetermined time period may be empirically obtained, for example, 30 minutes.
If the state of charge of the power battery is within the predetermined state of charge range, the charging of the power battery can be considered to be a charging within a conventional range, and the state data in the charging can be used as a basis for estimating the available capacity of the power battery. The predetermined state of charge range may be empirically obtained, for example, 20% to 90%.
If the difference between the external charge state of the power battery after charging and the external charge state of the power battery before charging is larger than the preset charge state, the charging of the power battery can be considered to be complete, and the state data in the charging can be used as a basis for estimating the available capacity of the power battery. The predetermined state of charge may be empirically obtained, for example, 50%.
In summary, if the above five conditions are satisfied at the same time, the current charge is fast, the charge is normal and complete, and the state data in the current charge can be better used as the basis for estimating the available capacity of the power battery.
In still another embodiment, the step of estimating the available capacity of the power battery based on the internal estimated state of charge (step S13) may include, on the basis of fig. 1:
step S131, determining a difference between the internal estimated state of charge after charging and the internal estimated state of charge before charging of the power battery: ΔSOC (delta SOC) Inner part ＝SOC Inner 2 -SOC Inner 1 ，ΔSOC Inner part For the difference, SOC Inner 2 To estimate the state of charge after charging, SOC Inner 1 Is the internal estimated state of charge before charging.
Step S132, calculating the charge capacity of the power battery.
The charge capacity of the battery can be calculated by an ampere-hour integration method: c1 = ≡idt, C1 is the charge capacity of the battery, I is the charge current, and t is time.
And step S133, calculating the available capacity of the power battery according to the charging capacity and the difference value.
In this embodiment, the available capacity of the power battery is calculated by the difference between the internal estimated state of charge (rather than the external state of charge) after and before charging and the charge capacity of the power battery, so that the estimated available capacity of the power battery is more accurate
Specifically, calculating the available capacity of the power battery from the charge capacity and the difference value (step S133) may be performed by the following formula:
C2＝C1/ΔSOC inner part
Wherein C2 is the available capacity of the power battery, C1 is the charging capacity, and ΔSOC Inner part Is the difference as described above.
Since the available capacity of the same power cell may vary significantly at different temperatures, in other embodiments, the available capacity equivalent to the predetermined temperature may also be estimated. In yet another embodiment, the method may further include step S14 on the basis of fig. 1: and screening the temperature of the power battery in the quick charge process from the historical state data of the vehicle.
In this embodiment, estimating the available capacity of the power battery based on the internal estimated state of charge (step S13) may include step S134: and estimating the available capacity of the power battery equivalent to the preset temperature according to the internal estimated state of charge and the temperature of the power battery in the quick charge process.
Wherein, the temperature of the power battery in the quick charge process is different, and the available capacity of the power battery equivalent to the preset temperature is also different. The predetermined temperature may be a normal temperature, for example, 25 ℃. The law of the influence of the temperature of the power battery in the fast charge process on the available capacity at the preset temperature can be predetermined, and according to the law, the available capacity of the power battery equivalent to the preset temperature is estimated. In this embodiment, the estimated available capacity is adjusted to be equivalent to the available capacity at the predetermined temperature, and the applicability is better.
Based on the above embodiment, estimating the available capacity of the power battery equivalent to the predetermined temperature based on the internal estimated state of charge and the temperature of the power battery during the quick charge (step S134) may include:
step S1341, determining a difference between the internal estimated state of charge of the power battery after charging and the internal estimated state of charge before charging: ΔSOC (delta SOC) Inner part ＝SOC Inner 2 -SOC Inner 1 ，ΔSOC Inner part For the difference, SOC Inner 2 To estimate the state of charge after charging, SOC Inner 1 Is the internal estimated state of charge before charging.
In step S1342, the charge capacity of the power battery is calculated.
The charge capacity of the battery can be calculated by an ampere-hour integration method: c1 = ≡idt, C1 is the charge capacity of the battery, I is the charge current, and t is time.
Step S1343, calculating the reference capacity of the power battery according to the charge capacity and the difference.
The reference capacity can be calculated according to the following formula: c0 =c1/Δsoc Inner part Wherein C0 is the reference capacity, C1 is the charge capacity, ΔSOC Inner part Is the difference as described above.
In step S1344, an average temperature value of the power battery during the fast charge is calculated.
The average temperature value may be calculated according to the following formula:
T c ＝(T max_1 +T max_1 +……+T max_n )/2n+(T min_1 +T min_1 +……+T min_n )/2n
wherein T is c Is the average temperature value, T max_n T is the maximum value of the temperatures of the single batteries in the nth sample min_n The minimum value of the temperatures of the single batteries in the nth sample is obtained, and n is the number of samples.
Step S1345, calculating the available capacity of the power battery equivalent to the predetermined temperature according to the reference capacity and the average temperature value.
The reference capacity is the capacity obtained according to one historical charge of the power battery, the average temperature value is the average temperature of the power battery in the charging process, and the available capacity of the power battery equivalent to the preset temperature is calculated according to the average temperature and the preset regulation rule.
In still another embodiment, calculating the available capacity of the power battery equivalent to the predetermined temperature from the reference capacity and the average temperature value (step S1345) may include:
determining a correction coefficient according to the average temperature value; the available capacity of the power cell equivalent to a predetermined temperature is calculated according to the following formula:
C3＝C0/(1+ρ)
C0＝C1/ΔSOC inner part
Wherein ρ is a correction coefficient, C0 is a reference capacity, C3 is an available capacity of the power battery equivalent to a predetermined temperature, C1 is a charge capacity, ΔSOC Inner part Is the difference as described above.
For example, the correction coefficient ρ may have a predetermined correspondence with the average temperature value. Table 1 below shows the correspondence between the correction coefficient and the average temperature value provided by an exemplary embodiment.
TABLE 1
Average temperature (. Degree. C.) 55 40 25 10 0 -10 -20 -30
Correction coefficient +5.5％ +2.9％ 0 -4.7％ -8.4％ -11.4％ -15.8％ -17.2％
Correction coefficient ρ is dependent on average temperature value T c The varying function ρ=g (T c ) Can be obtained by piecewise linear fitting in Table 1 above, g (. Cndot.) is a function. In the example of table 1, the correction coefficient corresponding to 25 ℃ is 0, and 25 ℃ may be the above-mentioned equivalent predetermined temperature.
In the embodiment, the correction coefficient is determined through the average temperature value, the reference capacity is further adjusted through the correction coefficient, the available capacity of the power battery equivalent to the preset temperature is obtained, and the calculation method is simple and high in reliability.
The disclosure also provides an available capacity estimation device of the power battery. Fig. 4 is a block diagram of an available capacity estimating apparatus of a power battery provided by an exemplary example. As shown in fig. 4, the available capacity estimation device 400 of the power battery may include a screening module 401, a determination module 402, and an estimation module 403.
The first screening module 401 is configured to screen out an external charge state of the power battery sent to the outside by the vehicle in a fast charge process from historical state data of the vehicle.
The determining module 402 is configured to determine an internal estimated state of charge of the power battery estimated inside the vehicle corresponding to the external state of charge, where the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween.
The estimation module 403 is configured to estimate the available capacity of the power cell based on the internal estimated state of charge.
Optionally, the first screening module 401 is configured to screen, from the historical state data of the vehicle, an outgoing charge state of the power battery that is sent to the outside by the vehicle during a charging process that satisfies the following conditions:
the charging current of the power battery is greater than a predetermined current threshold;
the temperature of the power battery is within a predetermined temperature range;
the charging time period of the power battery is longer than a preset time period;
the external charge state of the power battery is within a predetermined charge state range;
the difference between the external charge state of the power battery after charging and the external charge state before charging is greater than a predetermined charge state.
Alternatively, the estimation module 403 may include a first determination sub-module, a first calculation sub-module, and a second calculation sub-module.
The first determination submodule is used for determining a difference value between an internal estimated state of charge of the power battery after charging and an internal estimated state of charge of the power battery before charging.
The first calculation submodule is used for calculating the charge capacity of the power battery.
The second calculation submodule is used for calculating the available capacity of the power battery according to the charging capacity and the difference value.
Optionally, the second calculation submodule is configured to perform calculation of the available capacity of the power cell from the charge capacity and the difference value by:
C2＝C1/ΔSOC inner part
Wherein C2 is the available capacity of the power battery, C1 is the charging capacity, and ΔSOC Inner part Is the difference.
Alternatively, the power cell available capacity estimation device 400 may include a second screening module.
The second screening module is used for screening the temperature of the power battery in the quick charge process from the historical state data of the vehicle.
In this embodiment, the estimation module 403 is configured to estimate, based on the internal estimated state of charge and the temperature of the power battery during the fast charge, that the power battery is equivalent to the available capacity at the predetermined temperature.
Optionally, the estimation module 403 includes a second determination sub-module, a third calculation sub-module, a fourth calculation sub-module, a fifth calculation sub-module, and a sixth calculation sub-module.
The second determination submodule is used for determining a difference value between the internal estimated state of charge of the power battery after charging and the internal estimated state of charge of the power battery before charging.
The third calculation sub-module is used for calculating the charge capacity of the power battery.
The fourth calculation submodule is used for calculating the reference capacity of the power battery according to the charging capacity and the difference value.
The fifth calculating submodule is used for calculating an average temperature value of the power battery in the fast charging process.
The sixth calculation submodule is used for calculating the available capacity of the power battery equivalent to the preset temperature according to the reference capacity and the average temperature value.
Optionally, the sixth computing submodule includes a third determining submodule and a seventh computing submodule.
The third determination submodule is used for determining a correction coefficient according to the average temperature value.
The seventh calculation submodule is used for calculating the available capacity of the power battery equivalent to the preset temperature according to the following formula:
C3＝C0/(1+ρ)
C0＝C1/ΔSOC inner part
Wherein ρ is a correction coefficient, C0 is a reference capacity, C3 is an available capacity of the power battery equivalent to a predetermined temperature, C1 is a charge capacity, ΔSOC Inner part Is the difference.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
By the technical scheme, the state of charge (internal estimated state of charge) of the power battery estimated in the vehicle is used for replacing the state of charge (external state of charge) of the power battery sent outwards by the vehicle, so that the available capacity of the power battery is estimated. Compared with the external power generation state of charge, the internal estimated state of charge is closer to the actual state of charge, so that the estimated available capacity of the power battery is more accurate, necessary supervision measures can be taken on the power battery in time, the user experience is improved, and an accurate basis is provided for researching the influence of user behaviors and environment on the power battery.
The present disclosure also provides an electronic device including a memory and a processor. A memory having a computer program stored thereon; the processor is configured to execute the computer program in the memory to implement the steps of the above-described method provided by the present disclosure.
Fig. 5 is a block diagram of an electronic device 500, according to an example embodiment. As shown in fig. 5, the electronic device 500 may include: a processor 501, a memory 502. The electronic device 500 may also include one or more of a multimedia component 503, an input/output (I/O) interface 504, and a communication component 505.
Wherein the processor 501 is configured to control the overall operation of the electronic device 500 to perform all or part of the steps in the method for estimating the available capacity of the power battery described above. The memory 502 is used to store various types of data to support operation at the electronic device 500, which may include, for example, instructions for any application or method operating on the electronic device 500, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 502 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 503 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 502 or transmitted through the communication component 505. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 504 provides an interface between the processor 501 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the electronic device 500 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 505 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic device 500 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processors (Digital Signal Processor, abbreviated as DSP), digital signal processing devices (Digital Signal Processing Device, abbreviated as DSPD), programmable logic devices (Programmable Logic Device, abbreviated as PLD), field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described method of estimating the available capacity of a power battery.
In another exemplary embodiment, a computer readable storage medium is also provided, comprising program instructions which, when executed by a processor, implement the steps of the method of estimating the available capacity of a power cell as described above. For example, the computer readable storage medium may be the memory 502 including program instructions described above, which are executable by the processor 501 of the electronic device 500 to perform the method of estimating the available capacity of the power battery described above.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A method of estimating the available capacity of a power cell, the method comprising:
screening the external charge state of the power battery, which is sent outwards by the vehicle in a quick charge process, from historical state data of the vehicle;
determining an internal estimated state of charge of the power battery estimated inside the vehicle corresponding to the external state of charge, wherein the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween;
and estimating the available capacity of the power battery according to the internal estimated state of charge.
2. The method of claim 1, wherein screening the vehicle's outward state of charge of the power battery that is transmitted outward during a quick charge from historical state data of the vehicle comprises: screening the outward charge state of the power battery, which is sent outward by the vehicle in the primary charging process meeting the following conditions, from historical state data of the vehicle:
the charging current of the power battery is greater than a predetermined current threshold;
the temperature of the power battery is within a predetermined temperature range;
the charging time length of the power battery is longer than a preset time length;
the external state of charge of the power cell is within a predetermined state of charge range;
the difference between the external charge state of the power battery after charging and the external charge state before charging is larger than a preset charge state.
3. The method of claim 1, wherein estimating the available capacity of the power cell based on the internal estimated state of charge comprises:
determining a difference between the internal estimated state of charge after charging of the power battery and the internal estimated state of charge before charging;
calculating the charge capacity of the power battery;
and calculating the available capacity of the power battery according to the charging capacity and the difference value.
4. A method according to claim 3, wherein calculating the available capacity of the power battery from the charge capacity and the difference is performed by the following formula:
C2＝C1/ΔSOC inner part
Wherein C2 is the available capacity of the power battery, C1 is the charging capacity, and delta SOC Inner part Is the difference.
5. The method according to claim 1, wherein the method further comprises: screening the temperature of the power battery in the quick charge process from the historical state data of the vehicle;
estimating the available capacity of the power cell based on the internal estimated state of charge, comprising: and estimating the available capacity of the power battery equivalent to a preset temperature according to the internal estimated charge state and the temperature of the power battery in the quick charge process.
6. The method of claim 5, wherein estimating the available capacity of the power cell equivalent to a predetermined temperature based on the internal estimated state of charge and the temperature of the power cell during the fast charge comprises:
determining a difference between the internal estimated state of charge of the power battery after charging and the internal estimated state of charge before charging;
calculating the charge capacity of the power battery;
calculating a reference capacity of the power battery according to the charging capacity and the difference value;
calculating an average temperature value of the power battery in the quick charge process;
and calculating the available capacity of the power battery equivalent to the preset temperature according to the reference capacity and the average temperature value.
7. The method of claim 6, wherein calculating the available capacity of the power cell equivalent to a predetermined temperature from the reference capacity and the average temperature value comprises:
determining a correction coefficient according to the average temperature value;
the available capacity of the power cell equivalent to a predetermined temperature is calculated according to the following formula:
C3＝C0/(1+ρ)
C0＝C1/ΔSOC inner part
Wherein ρ is the correction coefficient, C0 is the reference capacity, C3 is the available capacity of the power battery equivalent to a predetermined temperature, C1 is the charge capacity, ΔSOC Inner part Is the difference.
8. An available capacity estimation device of a power battery, the device comprising:
the screening module is used for screening the outward charge state of the power battery, which is sent outward by the vehicle in one quick charge process, from the historical state data of the vehicle;
a determining module configured to determine an internal estimated state of charge of the power battery estimated inside the vehicle, corresponding to the external state of charge, where the internal estimated state of charge and the external state of charge have a predetermined correspondence therebetween;
and the estimation module is used for estimating the available capacity of the power battery according to the internal estimated state of charge.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-7.
10. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-7.
CN202010916786.7A 2020-09-03 2020-09-03 Method and device for estimating available capacity of power battery, medium and equipment Active CN112114258B (en)

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