CN110850319A - Method and device for estimating number of cycles of battery from water jumping point and electronic equipment - Google Patents

Method and device for estimating number of cycles of battery from water jumping point and electronic equipment Download PDF

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Publication number
CN110850319A
CN110850319A CN201911082340.2A CN201911082340A CN110850319A CN 110850319 A CN110850319 A CN 110850319A CN 201911082340 A CN201911082340 A CN 201911082340A CN 110850319 A CN110850319 A CN 110850319A
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China
Prior art keywords
battery
detected
capacity
cycles
internal resistance
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CN201911082340.2A
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马昊
吕喆
王垒
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BEIJING HYPERSTRONG TECHNOLOGY CO LTD
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BEIJING HYPERSTRONG TECHNOLOGY CO LTD
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Priority to CN201911082340.2A priority Critical patent/CN110850319A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392Determining battery ageing or deterioration, e.g. state of health
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389Measuring internal impedance, internal conductance or related variables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285Testing apparatus
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention provides a method and a device for estimating the number of cycles of a battery from a water jump point and electronic equipment. The method comprises the following steps: receiving a detection instruction, wherein the detection instruction is used for indicating the number of the circulation circles of the battery to be detected from the water jump point; respectively acquiring a first total charging capacity, a first capacity in a constant voltage charging stage and a first discharging direct current internal resistance of the battery to be detected according to the detection instruction; determining the number of cycles of the battery to be detected from a water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance; and displaying the number of the circulation circles of the battery to be detected from the water jumping point. The method and the device for estimating the number of the cycles of the battery from the water jump point and the electronic equipment can accurately estimate the number of the cycles of the battery from the water jump point, are favorable for reasonable recycling of the lithium battery, and further realize the maximum utilization of resources.

Description

Method and device for estimating number of cycles of battery from water jumping point and electronic equipment
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a method and a device for estimating the number of cycles of a battery from a water jumping point and electronic equipment.
Background
With the development of science and technology, lithium ion batteries (lithium batteries for short) are becoming the first choice for electric vehicles due to their high energy density and long cycle life, and are rapidly developed and applied.
When the battery life State (State of Health, SOH) of the battery is reduced to 80%, the battery is no longer suitable for the field of Power batteries, the echelon utilization of the retired battery is considered, the battery is turned to the second gradient, and the battery is used for the energy storage fields of a Power grid, new energy Power generation, an Uninterruptible Power Supply (UPS) and the like, so that the maximum utilization of resources is realized. However, the battery tends to decline to a water jump point during subsequent use. The water jumping point of the lithium ion battery is a key point of the sharp change of the battery health state and is also a key judgment index of the lithium ion battery changing from the second gradient to the second/third gradient in the echelon utilization.
At present, there is no effective method for quickly estimating when the lithium battery reaches the water jump point, so how to accurately estimate the use state of the lithium battery and determine the number of cycles of the lithium battery from the water jump point is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention provides a method and a device for estimating the number of cycles of a battery from a water jump point and electronic equipment, which are used for solving the technical problem that the number of cycles of the battery from the water jump point cannot be determined in the prior art, so that the aim of maximizing the utilization of resources is fulfilled.
In a first aspect, the present invention provides a method for estimating the number of cycles of a battery from a water jump point, including:
receiving a detection instruction, wherein the detection instruction is used for indicating the number of the circulation circles of the battery to be detected from the water jump point;
respectively acquiring a first total charging capacity, a first capacity in a constant voltage charging stage and a first discharging direct current internal resistance of the battery to be detected according to the detection instruction;
determining the number of cycles of the battery to be detected from a water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance;
and displaying the number of the circulation circles of the battery to be detected from the water jumping point.
Further, determining the number of cycles of the battery to be detected from the trip point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance includes:
determining a first percentage of the first capacity of the battery to be detected in the constant voltage charging stage to the first total charging capacity according to the first capacity and the first total charging capacity;
determining the range of the number of cycles of the battery to be detected according to the first percentage and the first discharging direct current internal resistance;
and comparing the cycle circle range with a prestored target water jumping point to obtain the cycle circles of the battery to be detected from the water jumping point.
Further, the method further comprises:
respectively acquiring a second total charging capacity, a second capacity in a constant voltage charging stage and a second discharging direct current internal resistance of at least one sample battery;
determining a second capacity of each of the at least one sample cell in the constant voltage charging phase as a second percentage of the second total charging capacity based on the second total charging capacity and the second capacity;
and determining the target water jumping point corresponding to the at least one sample battery according to the second percentage and the second discharging direct current internal resistance.
Further, the determining the target trip point corresponding to the at least one sample battery according to the second percentage and the second discharging direct current internal resistance includes:
respectively establishing a first corresponding relation between a second percentage corresponding to each sample battery in the at least one sample battery and the number of cycle turns;
respectively establishing a second corresponding relation between a second discharging direct current internal resistance and the number of circulating circles corresponding to each sample battery in the at least one sample battery;
and fitting the first corresponding relation and the second corresponding relation to obtain the target water jump point.
Further, the determining the cycle number range of the battery to be detected according to the first percentage and the first discharging direct current internal resistance includes:
determining a corresponding relation between the number of cycles and the state of battery life SOH and a first correlation coefficient of the corresponding relation between the number of cycles and the first percentage according to the first percentage;
determining a corresponding relation between the number of cycles and the service life state SOH of the battery and a second correlation coefficient of the corresponding relation between the number of cycles and the first discharging direct current internal resistance according to the first discharging direct current internal resistance;
and determining the cycle number range of the battery to be detected according to the first correlation coefficient and the second correlation coefficient.
Further, the first discharging direct current internal resistance is the internal resistance of the battery to be detected in the constant current discharging stage, and the second discharging direct current internal resistance is the internal resistance of the sample battery in the constant current discharging stage.
Further, the comparing the cycle turn range with a prestored target trip point to obtain the cycle turn of the battery to be detected from the trip point comprises:
comparing the cycle circle range with a prestored target water jumping point to obtain an estimated value of the cycle circle distance water jumping point of the battery to be detected;
and determining the number of the cycle turns of the battery to be detected from the water jump point according to the estimated value.
In a second aspect, the present invention provides an apparatus for estimating the number of cycles of a battery from a water jump point, comprising:
the device comprises a receiving module, a detecting module and a judging module, wherein the receiving module is used for receiving a detection instruction, and the detection instruction is used for indicating and estimating the number of cycles of the battery to be detected from a water jumping point;
the acquisition module is used for respectively acquiring a first total charging capacity, a first capacity in a constant voltage charging stage and a first discharging direct current internal resistance of the battery to be detected according to the detection instruction;
the determining module is used for determining the number of the cycle turns of the battery to be detected from the water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance;
and the display module is used for displaying the number of the circulation circles of the battery to be detected from the water jump point.
Further, the determining module is specifically configured to:
determining a first percentage of the first capacity of the battery to be detected in the constant voltage charging stage to the first total charging capacity according to the first capacity and the first total charging capacity;
determining the range of the number of cycles of the battery to be detected according to the first percentage and the first discharging direct current internal resistance;
and comparing the cycle circle range with a prestored target water jumping point to obtain the cycle circles of the battery to be detected from the water jumping point.
Further, the obtaining module is further configured to obtain a second total charging capacity, a second capacity in the constant voltage charging stage, and a second discharging direct current internal resistance of the at least one sample battery, respectively;
the determining module is further configured to determine, according to the second total charging capacity and the second capacity, a second percentage of a second capacity of each sample battery of the at least one sample battery in the constant voltage charging phase to the second total charging capacity;
the determining module is further configured to determine the target trip point corresponding to the at least one sample battery according to the second percentage and the second discharging direct current internal resistance.
Further, the determining module is specifically configured to:
respectively establishing a first corresponding relation between a second percentage corresponding to each sample battery in the at least one sample battery and the number of cycle turns;
respectively establishing a second corresponding relation between a second discharging direct current internal resistance and the number of circulating circles corresponding to each sample battery in the at least one sample battery;
and fitting the first corresponding relation and the second corresponding relation to obtain the target water jump point.
Further, the determining module is specifically configured to:
determining a corresponding relation between the number of cycles and the state of battery life SOH and a first correlation coefficient of the corresponding relation between the number of cycles and the first percentage according to the first percentage;
determining a corresponding relation between the number of cycles and the service life state SOH of the battery and a second correlation coefficient of the corresponding relation between the number of cycles and the first discharging direct current internal resistance according to the first discharging direct current internal resistance;
and determining the cycle number range of the battery to be detected according to the first correlation coefficient and the second correlation coefficient.
Further, the first discharging direct current internal resistance is the internal resistance of the battery to be detected in the constant current discharging stage, and the second discharging direct current internal resistance is the internal resistance of the sample battery in the constant current discharging stage.
Further, the determining module is specifically configured to:
comparing the cycle circle range with a prestored target water jumping point to obtain an estimated value of the cycle circle distance water jumping point of the battery to be detected;
and determining the number of the cycle turns of the battery to be detected from the water jump point according to the estimated value.
In a third aspect, the present invention provides an electronic device comprising:
a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any of the first aspects.
In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program for causing an electronic device to perform the method of any of the first aspects.
According to the method, the device and the electronic equipment for estimating the number of the cycles of the battery from the water jumping point, provided by the invention, the detection instruction is received, the first total charging capacity, the first capacity and the first discharging direct current internal resistance of the battery to be detected in the constant voltage charging stage are obtained according to the detection instruction, the number of the cycles of the battery to be detected from the water jumping point is determined according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance in the constant voltage charging stage, and the number of the cycles of the battery to be detected from the water jumping point is displayed.
It should be understood that what is described in the summary above is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for estimating the number of cycles of a battery from a water jump point according to the present invention;
FIG. 2 is a schematic view of a display interface of an apparatus for estimating the number of cycles of a battery from a water jump point according to the present invention
FIG. 3 is a schematic flow chart of another method for estimating the number of cycles of the battery from the trip point according to the present invention;
FIG. 4 is a schematic flow chart illustrating a method for estimating the number of cycles of the battery from the trip point according to another embodiment of the present invention;
FIG. 5 is a graph of the trend of the second percentage (ε) versus the number of cycles (curve two) versus the cycle number-SOH curve (curve three);
FIG. 6 is a graph of the second discharge DC internal resistance versus the number of cycles (curve one) versus the number of cycles-SOH (curve three);
FIG. 7 is a fitted curve of the first correspondence;
FIG. 8 is a fitted curve of the second correspondence;
FIG. 9 is a schematic structural diagram of an apparatus for estimating the number of cycles of a battery from a water jump point according to the present invention;
FIG. 10 is a schematic structural diagram of another apparatus for estimating the number of cycles of a battery from a water jump point according to the present invention;
FIG. 11 is a schematic structural diagram of another apparatus for estimating the number of cycles of a battery from a water jump point according to the present invention;
fig. 12 is a schematic structural diagram of an estimation apparatus for the number of cycles of a battery from a water jump point according to the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the invention by those skilled in the art with reference to specific embodiments.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The terms "comprises," "comprising," and any other variation thereof in the description of the embodiments of the invention are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The method for estimating the number of cycles of the battery from the water jump point is applied to an application scene for judging whether the retired battery can be reused, particularly to an application scene for estimating the number of cycles of the battery from the water jump point and realizing the maximum utilization of resources.
In view of the above problems, embodiments of the present invention provide a method for estimating the number of cycles of a battery from a water jump point, in which a detection instruction is received, a first total charging capacity, a first capacity and a first discharging direct current internal resistance of the battery to be detected in a constant voltage charging stage are obtained according to the detection instruction, and then the number of cycles of the battery to be detected from the water jump point is determined according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance in the constant voltage charging stage, and the number of cycles of the battery to be detected from the water jump point is displayed.
Fig. 1 is a schematic flow chart of a method for estimating the number of cycles of a battery from a water jump point, as shown in fig. 1, the method for estimating the number of cycles of a battery from a water jump point according to an embodiment of the present invention may be implemented by any device for estimating the number of cycles of a battery from a water jump point, and the device may be implemented by software and/or hardware. As shown in fig. 1, the method for estimating the number of cycles of the battery from the water jump point according to the embodiment of the present invention includes the following steps:
s101: and receiving a detection instruction, wherein the detection instruction is used for indicating the number of the circulation circles of the battery to be detected from the water jump point.
In this step, the detection instruction may be triggered by the user in a voice manner, may also be triggered by pressing a physical key or a virtual key, and may also be triggered by other manners.
In addition, the battery to be detected may be a battery decommissioned from an electric vehicle or the like (first gradient), or a battery decommissioned from new energy power generation or the like (second gradient), where the battery may be various types of lithium ion batteries, such as: the battery to be detected is not limited herein, and the battery to be detected may be a lithium iron phosphate battery, a ternary battery, or other types of batteries; the number of the cycle turns of the battery to be detected from the water jumping point is the number of the cycle turns of the retired battery from the water jumping point; the jumping point refers to the number of corresponding cycles when the battery ages under the action of multiple stresses to cause the unconventional rapid attenuation of the capacity of the lithium ion battery when the battery works.
After receiving a detection instruction triggered by a user, the electronic equipment estimates the number of cycles of the battery to be detected from the water jump point according to the detection instruction.
S102: and respectively acquiring the first total charging capacity, the first capacity in the constant voltage charging stage and the first discharging direct current internal resistance of the battery to be detected according to the detection instruction.
The first total charging capacity is the capacity of the battery to be detected when the battery to be detected is fully charged, the first capacity is the difference value of capacity intervals corresponding to the constant voltage part of the battery to be detected in the constant voltage charging stage, and the first discharging direct current internal resistance is the resistance corresponding to the battery to be detected under dynamic voltage in the constant current discharging stage.
In one possible implementation manner, the first discharging direct current internal resistance may be calculated according to the following formula:
wherein R is0Is the first discharging direct current internal resistance; u shape2()The voltage instantaneous value of the battery to be detected at the second moment in the constant current discharging process is obtained; u shape1()The voltage instantaneous value of a battery to be detected at a first moment in the constant-current discharging process is obtained; i is()Is the current in the constant current discharge process of the battery to be detected, wherein I()Is a constant value.
S103: and determining the number of the cycle turns of the battery to be detected from the water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance.
In this step, a first percentage of the first capacity in the first total charging capacity can be calculated according to the first total charging capacity and the first capacity, a cycle number value corresponding to the first percentage and the first discharging direct-current internal resistance in the data comparison map is obtained, a related average number of the first percentage and the cycle number corresponding to the first discharging direct-current internal resistance, namely the cycle number of the battery to be detected, is obtained through calculation, and the cycle number is compared with the water jump point to obtain the cycle number of the battery to be detected from the water jump point. The data comparison map refers to a graph of a change relationship between the number of battery cycles and the percentage (epsilon) of the total capacity occupied by the capacity in the SOH and constant voltage phases and a graph of a change relationship between the number of battery cycles and the total capacity in the SOH and the discharge direct current internal resistance, and the data comparison map can be stored in a line graph format or a table format, and the embodiment of the invention is not limited in the storage form of the data comparison map.
The specific implementation of how to determine the number of cycles of the battery to be detected from the trip point will be described in detail later.
S104: and displaying the number of the circulation circles of the battery to be detected from the water jumping point.
Fig. 2 is a schematic diagram of a display interface of an estimation apparatus for cycle number of a battery from a water jump point, which is provided in an embodiment of the present invention, as shown in fig. 2, a prestored sample battery water jump point is 1393, a cycle number of the battery to be detected is 393, and a difference is made between the water jump point and the cycle number of the battery to be detected, so as to obtain the cycle number of the battery to be detected from the water jump point, that is, the cycle number of the battery to be detected from the water jump point shown in fig. 2 is 1000.
In the step, the difference is made between the pre-stored diving point and the calculated cycle number of the battery to be detected to obtain the cycle number of the battery to be detected from the diving point, and the result is displayed on a display interface, so that the cycle number of the battery to be detected from the diving point can be obtained more visually.
The method for estimating the number of the cycles of the battery from the water jump point, provided by the embodiment of the invention, comprises the steps of obtaining a first total charging capacity, a first capacity and a first discharging direct current internal resistance of the battery to be detected according to a received detection instruction, and determining the number of cycles of the battery to be detected according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance, comparing the number of the cycle turns with the pre-stored diving points to obtain the number of the cycle turns of the battery to be detected from the diving points, then displaying the number of the cycle turns of the battery to be detected from the diving points, since the relative average of the first percentage and the number of the cycle turns corresponding to the first discharging direct current internal resistance is calculated and compared with the pre-stored water jumping point, so as to obtain the number of the circulation turns from the water jump point and display the number of the circulation turns from the water jump point, therefore, the limitation of judging the distance from the water jump point by using the single battery characteristic parameter can be effectively avoided.
Fig. 3 is a schematic flow chart of another method for estimating the number of cycles of the battery from the trip point, as shown in fig. 3, the method for estimating the number of cycles of the battery from the trip point according to this embodiment is further refined in S103 on the basis of the embodiment shown in fig. 1 of the present invention, and the method for estimating the number of cycles of the battery from the trip point according to this embodiment includes the following steps:
s1031: and determining a first percentage of the first capacity of the battery to be detected in the constant voltage charging stage to the first total charging capacity according to the first capacity and the first total charging capacity.
Wherein the first percentage is a percentage of the first capacity to the first total charging capacity, in one implementation, the first percentage may be determined according to the following formula:
wherein ε is a first percentage, UConstant temperatureIs a first capacity, UGeneral assemblyIs the first total charge capacity.
S1032: and determining the cycle number range of the battery to be detected according to the first percentage and the first discharging direct current internal resistance.
In the step, the cycle period refers to that the battery is charged at constant current to the upper limit cut-off voltage, the constant voltage charging is kept until the current is reduced to 0.05C, the battery reaches 100% SOC, then the lithium ion battery is discharged to the discharge lower limit cut-off voltage, and the battery is kept standing until the voltage of the battery is stable; the number of cycle turns refers to the number of cycle periods of the battery to be detected when the detection is ended; the number of cycles is a range of fluctuations due to the complexity of the electrochemical reaction inside the cell.
Further, one possible implementation manner of the method for acquiring the number of cycles of the battery to be detected is as follows:
determining a corresponding relation between the number of cycles and the state of battery life SOH and a first correlation coefficient of the corresponding relation between the number of cycles and the first percentage according to the first percentage; determining a corresponding relation between the number of cycles and the SOH (state of service) of the battery and a second correlation coefficient of the corresponding relation between the number of cycles and the first discharging direct current internal resistance according to the first discharging direct current internal resistance;
and determining the cycle number range of the battery to be detected according to the first correlation coefficient and the second correlation coefficient.
According to the first percentage of the battery to be detected, the corresponding cycle number X in a change relation graph of the cycle number of the battery and the percentage (epsilon) of the capacity in the SOH and constant voltage stage to the total capacityεAnd the corresponding cycle number X of the first discharging direct current internal resistance in a relation graph of the change curves of the cycle number of the battery, the SOH and the discharging direct current internal resistanceRAnd calculating the corresponding correlation coefficient to obtain the number of cycle turns X of the battery to be detectedPractice ofIn one implementation, the number of cycles of the battery to be detected can be calculated according to the following formula:
wherein a is the cycle number and SOH change curve and the correlation coefficient of the cycle number and discharge direct current internal resistance change curve; b is the correlation coefficient corresponding to the number of cycles and the SOH curve and the percentage (epsilon) curve of the number of cycles and the constant pressure phase capacity in the total capacity.
S1033: and comparing the cycle circle range with a prestored target water jumping point to obtain the cycle circles of the battery to be detected from the water jumping point.
In the step, the percentage of the first capacity to the first total charging capacity, namely the first percentage, is calculated, the first percentage of the battery to be detected and the number of the cycle turns corresponding to the first discharging direct current internal resistance in the data comparison map are obtained, the correlation average of the first percentage of the battery to be detected and the number of the cycle turns corresponding to the first discharging direct current internal resistance is calculated, namely the number of the cycle turns of the battery to be detected, and then the number of the cycle turns of the battery to be detected from the water jumping point is obtained by subtracting the number of the cycle turns of the battery to be detected from the water jumping point.
Further, one possible implementation manner of the method for judging the number of cycles of the battery to be detected is as follows:
comparing the cycle circle range with a prestored target water jumping point to obtain an estimated value of the cycle circle distance to the water jumping point of the battery to be detected; and determining the number of the cycle turns of the battery to be detected from the water jump point according to the estimated value.
In the embodiment, the first percentage is determined according to the first capacity and the first total charging capacity, the number of the cycle turns of the battery to be detected is obtained according to the first percentage and the first discharging direct-current internal resistance, the number of the cycle turns of the battery to be detected from the water jumping point is determined by comparing the number of the cycle turns of the battery to be detected with the pre-stored target water jumping point, and the limitation that the water jumping point is judged by the characteristic parameter of the single battery can be effectively avoided by jointly comparing the first percentage and the first discharging direct-current internal resistance.
Fig. 4 is a schematic flow chart of a further method for estimating the number of cycles of the battery from the trip point, as shown in fig. 4, the method for estimating the number of cycles of the battery from the trip point is described in detail how to determine a process of a target trip point corresponding to at least one sample battery based on the embodiment shown in fig. 3, and the method for estimating the number of cycles of the battery from the trip point includes the following steps:
s301: and respectively acquiring a second total charging capacity, a second capacity in the constant voltage charging stage and a second discharging direct current internal resistance of at least one sample battery.
The sample battery is a brand-new battery which is the same as the battery to be detected in all aspects, the second total charging capacity is the capacity of the sample battery when the sample battery is fully charged, the second capacity is the capacity interval difference value corresponding to the constant voltage part of the sample battery in the constant voltage charging stage, and the second discharging direct current internal resistance is the resistance corresponding to the sample battery under the dynamic voltage when the sample battery is discharged at the constant current. In one implementation, the second discharge dc internal resistance may be calculated according to the following formula:
wherein R'0Is the second discharge direct current internal resistance U'2(Dis)The voltage instantaneous value of the sample battery at the second moment in the constant current discharging process is obtained; u'1(Dis)The voltage instantaneous value of a first moment in the constant-current discharging process of the sample battery; i'(Dis)And (3) the current of the sample battery in the constant current discharge process is a constant value.
S302: and determining a second percentage of the second capacity of each of the at least one sample battery in the constant voltage charging phase to the second total charging capacity according to the second total charging capacity and the second capacity.
Wherein the second percentage is a percentage of the second capacity to the second total charging capacity, and in one implementation, the second percentage may be calculated according to the following formula:
wherein epsilon 'is a second percentage, U'Constant temperatureIs of second capacity, U'General assemblyA second total charge capacity.
S303: and determining a target water jumping point corresponding to at least one sample battery according to the second percentage and the second discharging direct current internal resistance.
Specifically, after determining a second percentage of the second capacity of each sample battery in the constant-voltage charging stage to the second total charging capacity and a second discharging direct-current internal resistance of each sample battery, a target trip point corresponding to at least one sample battery may be determined according to the second percentage and the second discharging direct-current internal resistance. And the target water jumping point is the corresponding cycle number when the lithium ion battery capacity is abnormally and rapidly attenuated due to aging of the sample battery under the action of multiple stresses.
The steps for obtaining the target water jump point are as follows:
s3031: and respectively establishing a first corresponding relation between the second percentage and the cycle number corresponding to each sample battery in the at least one sample battery.
The first corresponding relationship may be a relationship between a trend of a curve (curve two) of the second percentage (epsilon) and the number of cycles and a curve (curve three) of the number of cycles-SOH, as shown in fig. 5, the trend of the second curve is similar to that of the third curve, but the second curve is an increasing curve and the third curve is a decreasing curve, that is, the relationship between the second curve and the third curve is negative correlation, and it can be found through calculation that the correlation coefficient of the second curve and the third curve is-96.70%. In one implementation, the correlation coefficient may be calculated as follows:
wherein r (X, Y) is the correlation coefficient of X and Y, Cov (X, Y) is the covariance of X and Y, Var [ X ] is the variance of X, and Var [ Y ] is the variance of Y.
S3032: and respectively establishing a second corresponding relation between the second discharging direct current internal resistance and the cycle number corresponding to each sample battery in the at least one sample battery.
The second corresponding relationship may be a relationship between a curve (curve one) of the second discharge direct-current internal resistance and the number of cycles and a curve (curve three) of the number of cycles-SOH, as shown in fig. 6, the change trend between the curve one and the curve three is similar, but the curve one is an increasing curve and the curve three is a decreasing curve, that is, the relationship between the curve one and the curve three is negative correlation, and the correlation coefficient between the curve one and the curve three is-92.98% through software calculation.
S3033: and fitting the first corresponding relation and the second corresponding relation to obtain a target water jump point.
The fitting process refers to selecting a linear regression model for fitting, selecting 5% or 10% as a confidence probability, fitting the first corresponding relationship and the second corresponding relationship through software, where the fitting software may be MATLAB software or Origin software, and the embodiment of the present invention is not limited to the fitting software for the first corresponding relationship and the second corresponding relationship, as shown in fig. 7, after fitting the first corresponding relationship, an intersection point, that is, the diving point X 'corresponding to the sample battery obtained according to the second percentage is obtained'εAs shown in fig. 8, after fitting the second corresponding relationship, an intersection point, i.e. a root, is obtainedObtaining a diving point X 'corresponding to the sample battery according to the second discharging direct current resistance'R. In one implementation, the target trip point X of the sample cell can be calculated according to the following formulaDiving
In this embodiment, a second percentage is determined according to a second capacity and a second total charge capacity, a first corresponding relationship and a second corresponding relationship are established, a cycle number-second discharge direct current internal resistance change curve before and after the lithium ion battery is subjected to water-jumping is fitted, and an abscissa of an intersection point is recorded as X'RAnd fitting a cycle number-epsilon change curve before and after the lithium ion battery is subjected to water jumping to obtain the abscissa of the intersection point as X'εThe diving point X of the sample battery can be obtained through calculationDivingAccording to the invention, the estimated value of the number of the cycle turns of the battery to be detected from the water jumping point can be obtained by comparing the number of the cycle turns of the battery to be detected with the number of the cycle turns of the battery to be detected, and whether the battery to be detected can be recycled is judged according to the number of the cycle turns of the battery to be detected from the water jumping point, so that the maximum utilization of resources is realized.
Fig. 9 is a schematic structural diagram of an estimation apparatus for cycle number of a battery from a water jump point, as shown in fig. 9, the estimation apparatus for cycle number of a battery from a water jump point according to this embodiment includes: the device comprises a receiving module 11, an obtaining module 12, a detecting module 13 and a display module 14.
The receiving module 11 is configured to receive a detection instruction, where the detection instruction is used to instruct to estimate the number of cycles of the battery to be detected from the trip point;
the acquisition module 12 is configured to acquire a first total charging capacity, a first capacity in a constant voltage charging stage, and a first discharging direct current internal resistance of the battery to be detected, respectively, according to the detection instruction;
the determining module 13 is configured to determine, according to the first total charging capacity, the first capacity, and the first discharging direct-current internal resistance, the number of cycles of the battery to be detected from the trip point;
and the display module 14 is used for displaying the number of the cycle turns of the battery to be detected from the water jump point.
The device for estimating the number of cycles of the battery from the water jump point provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 10 is a schematic structural diagram of another apparatus for estimating the number of cycles of the battery from the trip point, as shown in fig. 10, the apparatus for estimating the number of cycles of the battery from the trip point provided in this embodiment further refines the determining module 13 on the basis of the apparatus for estimating the number of cycles of the battery from the trip point provided in the embodiment shown in fig. 9, and the apparatus for estimating the number of cycles of the battery from the trip point further includes the following solutions.
Further, the determining module 13 is specifically configured to:
determining a first percentage of the first capacity of the battery to be detected in the constant voltage charging stage to the first total charging capacity according to the first capacity and the first total charging capacity;
determining the cycle circle range of the battery to be detected according to the first percentage and the first discharging direct current internal resistance;
and comparing the cycle circle range with a prestored target water jumping point to obtain the cycle circles of the battery to be detected from the water jumping point.
Further, the determining module 13 is specifically configured to:
determining a corresponding relation between the number of cycles and the state of battery life SOH and a first correlation coefficient of the corresponding relation between the number of cycles and the first percentage according to the first percentage;
determining a corresponding relation between the number of cycles and the SOH (state of service) of the battery and a second correlation coefficient of the corresponding relation between the number of cycles and the first discharging direct current internal resistance according to the first discharging direct current internal resistance;
and determining the cycle number range of the battery to be detected according to the first correlation coefficient and the second correlation coefficient.
Further, the determining module 13 is specifically further configured to:
comparing the cycle circle range with a prestored target water jumping point to obtain an estimated value of the cycle circle distance from the water jumping point of the battery to be detected;
and determining the number of the cycle turns of the battery to be detected from the water jump point according to the estimated value.
The device for estimating the number of cycles of the battery from the water jump point provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 11 is a schematic structural diagram of another estimation apparatus for the number of cycles of the battery from the water jump point, as shown in fig. 12, the estimation apparatus for the number of cycles of the battery from the water jump point provided in this embodiment is further refined on the basis of the estimation apparatus for the number of cycles of the battery from the water jump point provided in the embodiment shown in fig. 10, and the estimation apparatus for the number of cycles of the battery from the water jump point provided in this embodiment further includes the following scheme.
Further, in this embodiment, the obtaining module 12 is further configured to obtain a second total charging capacity, a second capacity in the constant voltage charging stage, and a second discharging direct current internal resistance of the at least one sample battery, respectively;
the determining module 13 is further configured to determine, according to the second total charging capacity and the second capacity, a second percentage of the second capacity of each sample battery in the at least one sample battery in the constant voltage charging phase to the second total charging capacity;
the determining module 13 is further configured to determine a target trip point corresponding to the at least one sample battery according to the second percentage and the second discharging direct current internal resistance.
Further, the determining module 13 is specifically configured to:
respectively establishing a first corresponding relation between a second percentage corresponding to each sample battery in at least one sample battery and the number of cycle turns;
respectively establishing a second corresponding relation between a second discharging direct current internal resistance and the number of circulating circles corresponding to each sample battery in at least one sample battery;
and fitting the first corresponding relation and the second corresponding relation to obtain a target water jump point.
The device for estimating the number of cycles of the battery from the water jump point provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 12 is a schematic structural diagram of an estimation apparatus for the number of cycles of the battery from the trip point, as shown in fig. 12, the estimation apparatus for the number of cycles of the battery from the trip point in this embodiment includes: a memory 1001, a processor 1002, and a computer program;
wherein a computer program is stored in the memory 1001 and configured to be executed by the processor 1002 to implement the method for estimating the number of cycles of the battery from the trip point, provided by any of the embodiments corresponding to fig. 1, 3 and 4 of the present invention.
The memory 1001 and the processor 1002 are connected by a bus 1003.
An embodiment of the present invention provides a computer-readable storage medium storing a computer program, which causes the processor 1002 to execute the method for estimating the number of cycles of the battery from the trip point, provided by any of the embodiments shown in fig. 1, 3 and 4. The readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for estimating the number of cycles of a battery from a water jump point is characterized by comprising the following steps:
receiving a detection instruction, wherein the detection instruction is used for indicating the number of the circulation circles of the battery to be detected from the water jump point;
respectively acquiring a first total charging capacity, a first capacity in a constant voltage charging stage and a first discharging direct current internal resistance of the battery to be detected according to the detection instruction;
determining the number of cycles of the battery to be detected from a water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance;
and displaying the number of the circulation circles of the battery to be detected from the water jumping point.
2. The method according to claim 1, wherein the determining the number of cycles of the battery to be detected from the water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance comprises:
determining a first percentage of the first capacity of the battery to be detected in the constant voltage charging stage to the first total charging capacity according to the first capacity and the first total charging capacity;
determining the range of the number of cycles of the battery to be detected according to the first percentage and the first discharging direct current internal resistance;
and comparing the cycle circle range with a prestored target water jumping point to obtain the cycle circles of the battery to be detected from the water jumping point.
3. The method of claim 2, further comprising:
respectively acquiring a second total charging capacity, a second capacity in a constant voltage charging stage and a second discharging direct current internal resistance of at least one sample battery;
determining a second capacity of each of the at least one sample cell in the constant voltage charging phase as a second percentage of the second total charging capacity based on the second total charging capacity and the second capacity;
and determining the target water jumping point corresponding to the at least one sample battery according to the second percentage and the second discharging direct current internal resistance.
4. The method of claim 3, wherein the determining the target trip point for the at least one sample cell based on the second percentage and the second internal dc discharge resistance comprises:
respectively establishing a first corresponding relation between a second percentage corresponding to each sample battery in the at least one sample battery and the number of cycle turns;
respectively establishing a second corresponding relation between a second discharging direct current internal resistance and the number of circulating circles corresponding to each sample battery in the at least one sample battery;
and fitting the first corresponding relation and the second corresponding relation to obtain the target water jump point.
5. The method according to claim 3 or 4, wherein said determining a range of cycle numbers of the battery to be tested according to the first percentage and the first internal discharge direct current resistance comprises:
determining a corresponding relation between the number of cycles and the state of battery life SOH and a first correlation coefficient of the corresponding relation between the number of cycles and the first percentage according to the first percentage;
determining a corresponding relation between the number of cycles and the service life state SOH of the battery and a second correlation coefficient of the corresponding relation between the number of cycles and the first discharging direct current internal resistance according to the first discharging direct current internal resistance;
and determining the cycle number range of the battery to be detected according to the first correlation coefficient and the second correlation coefficient.
6. The method according to claim 3 or 4, wherein the first discharging direct current internal resistance is an internal resistance of the battery to be detected in a constant current discharging stage, and the second discharging direct current internal resistance is an internal resistance of the sample battery in the constant current discharging stage.
7. The method according to any one of claims 2 to 4, wherein the comparing the cycle number range with a pre-stored target trip point to obtain the cycle number of the battery to be detected from the trip point comprises:
comparing the cycle circle range with a prestored target water jumping point to obtain an estimated value of the cycle circle distance water jumping point of the battery to be detected;
and determining the number of the cycle turns of the battery to be detected from the water jump point according to the estimated value.
8. An apparatus for estimating the number of cycles of a battery from a trip point, comprising:
the device comprises a receiving module, a detecting module and a judging module, wherein the receiving module is used for receiving a detection instruction, and the detection instruction is used for indicating and estimating the number of cycles of the battery to be detected from a water jumping point;
the acquisition module is used for respectively acquiring a first total charging capacity, a first capacity in a constant voltage charging stage and a first discharging direct current internal resistance of the battery to be detected according to the detection instruction;
the determining module is used for determining the number of the cycle turns of the battery to be detected from the water jump point according to the first total charging capacity, the first capacity and the first discharging direct current internal resistance;
and the display module is used for displaying the number of the circulation circles of the battery to be detected from the water jump point.
9. An electronic device, comprising:
a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which causes an electronic device to perform the method of any of claims 1-7.
CN201911082340.2A 2019-11-07 2019-11-07 Method and device for estimating number of cycles of battery from water jumping point and electronic equipment Pending CN110850319A (en)

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