CN116298991A - Method and system for rapidly detecting and evaluating capacity of retired battery - Google Patents

Method and system for rapidly detecting and evaluating capacity of retired battery Download PDF

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Publication number
CN116298991A
CN116298991A CN202310598896.7A CN202310598896A CN116298991A CN 116298991 A CN116298991 A CN 116298991A CN 202310598896 A CN202310598896 A CN 202310598896A CN 116298991 A CN116298991 A CN 116298991A
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battery
retired
capacity
database
soc
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CN116298991B (en
Inventor
周浩
李重洋
谭杰
刘宣业
吴安军
谭凌云
陈鹏
郭昶
陈斌斌
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Hunan Lihuitong New Energy Technology Co ltd
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Hunan Lihuitong New Energy Technology 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2457—Query processing with adaptation to user needs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention relates to the technical field of retired battery recovery, and discloses a retired battery capacity rapid detection and evaluation method and system. Carrying out a preset rate discharge test on the battery cell to be tested to obtain characteristic parameters of the battery; according to the obtained OCV data, comparing the OCV data with an established battery characteristic parameter database, and determining a corresponding SOC interval of the retired battery OCV data; combining the acquired ACR according to the SOC interval,
Figure ZY_1
A kind of electronic device with a high-performance liquid crystal display
Figure ZY_2
Data is secondarily compared with an established battery characteristic parameter database, and the cycle times of the retired battery are further determined in the SOC intervalA number; according to the cycle times, combining the established capacity comparison database to obtain a retired battery capacity evaluation result; the comprehensive condition of the battery is rapidly and accurately measured through the OCV data and the characteristic parameters of the retired battery cell in a short time, and the problem of inaccurate evaluation of the existing battery is solved.

Description

Method and system for rapidly detecting and evaluating capacity of retired battery
Technical Field
The invention relates to the technical field of retired battery recovery, in particular to a retired battery capacity rapid detection and evaluation method and system.
Background
With the rapid development of new energy technology, new energy automobiles are increasingly widely used, retired batteries are used as core components of the new energy automobiles, sales are frequently created, and retired amount of the retired batteries is also increased. In the recycling process of the retired battery, the retired battery is divided into two recycling paths, namely battery echelon recycling and raw material recycling, wherein the recycling paths are determined by basic parameter conditions, capacity and the like of the retired battery, and the recyclable condition of the lithium battery is detected and judged firstly.
The existing retired battery recycling detection judging method has the problems that the time consumption is long, real-time detection cannot be achieved, and service scene requirements cannot be met when the existing retired battery recycling detection judging method is used for carrying out complete charge-discharge capacity test through sampling, the problem that the accuracy of detection and evaluation is low when the AC internal resistance is rapidly detected to be increased is solved, the retired battery in the market is various in variety in the recycling process, the difficulty of retired battery detection is further improved, and a recycling party can only rely on experience and basic data to judge. In the face of inaccurate detection and evaluation results and low efficiency of the retired battery, uncertainty exists in the recovery value of the retired battery, and transaction risks exist.
Disclosure of Invention
The invention provides a method and a system for rapidly detecting and evaluating capacity of retired batteries, which are used for solving the problems of long time consumption and inaccuracy in the conventional battery evaluation.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for rapidly detecting and evaluating capacity of a retired battery, including the following steps:
step 1: carrying out a preset rate discharge test on the battery cell to be tested to obtain characteristic parameters of the battery; the battery characteristic parameters include OCV, ACR,
Figure SMS_1
And +.>
Figure SMS_2
Data;
step 2: according to the obtained OCV data, comparing the OCV data with an established battery characteristic parameter database, and determining a corresponding SOC section of the retired battery OCV data; the battery characteristic parameter database is a database containing the corresponding relation between the OCV data and the battery SOC interval;
step 3: the SOC interval of the retired battery determined according to the step 2 is combined with the acquired ACR,
Figure SMS_3
And +.>
Figure SMS_4
The data is subjected to secondary comparison with an established battery characteristic parameter database, and the cycle times of the retired battery are further determined in an SOC interval; the battery characteristic parameter database also comprises ACR and/or->
Figure SMS_5
、/>
Figure SMS_6
The corresponding relation between the data and the cycle times;
step 4: according to the acquired cycle times, combining an established capacity comparison database to acquire a retired battery capacity evaluation result; the capacity comparison database is a database containing the corresponding relation between the circulation times and the capacity.
Through the design, the battery characteristic parameters of the battery core about the charge and discharge function are obtained through the rapid detection of the retired battery core, the current SOC value of the battery is preferentially determined, the battery characteristic parameter database and the capacity comparison database are compared to rapidly obtain the cycle times and the battery capacity evaluation result, and the detection speed of the short-time battery characteristic parameters is also improved as much as possible compared with the complete charge and discharge capacity test.
Further, the specific operation of further determining the cycle number of the retired battery includes: based on the acquired ACR,
Figure SMS_7
And +.>
Figure SMS_8
The data respectively obtain the corresponding rough values of the cycle times in the battery characteristic parameter database, and then respectively and respectively match with ACR and +.>
Figure SMS_9
And +.>
Figure SMS_10
Multiplying the weights corresponding to the data, and adding to obtain the cycle times of the retired battery.
Through the design, through the setting of the corresponding weight of the battery characteristic parameters, the relation between the battery cycle times and the battery characteristic parameters is more accurately indicated, so that the subsequent battery capacity is more accurate.
Further, the weight of each characteristic parameter is determined according to the increasing trend of the test value of the battery cycle attenuation.
Further, when the SOC sections corresponding to the OCV data of the retired battery are used, if two SOC sections are simultaneously corresponding, the SOC sections are further determined through secondary comparison, if the SOC sections are lower than the OCV data corresponding to all the SOC sections, the battery is directly judged to belong to the regeneration purpose, and if a plurality of similar OCV data exist in the determined SOC sections, the value is taken downwards nearby;
during secondary comparison, ACR can also be used,
Figure SMS_11
And +.>
Figure SMS_12
The data verifies the SOC interval corresponding to the retired battery OCV data;
when the retired battery capacity evaluation result is obtained, the obtained circulation times correspond to the circulation times in the capacity comparison database, and the corresponding retired battery capacity evaluation result is determined by taking the values nearby upwards.
Further, the establishing of the battery characteristic parameter database and the capacity comparison database comprises the following steps:
carrying out full-life charge-discharge experiments on a plurality of retired batteries, collecting current SOC values and current battery characteristic parameters of all retired batteries once after charge-discharge cycles of preset cycle times at intervals, and finally obtaining corresponding OCVs, ACRs, battery characteristics and battery characteristics of the plurality of retired batteries in different SOC values,
Figure SMS_13
And +.>
Figure SMS_14
Data;
dividing an SOC interval between 0% and 100% of SOC values according to a preset ratio, recording corresponding battery characteristic parameters of the obtained SOC value corresponding to the SOC interval, and establishing a battery characteristic parameter database corresponding to different battery characteristic parameters in different SOC intervals along with the increase of cycle times;
and establishing a capacity comparison database corresponding to different retired battery capacities of different cyclic charge and discharge times according to the average value of the total cyclic charge and discharge times of the retired batteries in the full-life charge and discharge experiments of the retired batteries.
Through the design, through the design of the battery characteristic parameter database and the capacity comparison database, the corresponding relation between all battery characteristic parameters of the retired battery and the SOC interval, the cycle times of the retired battery and the capacity of the retired battery under different using degrees is obtained, all conditions of the retired battery are comprehensively covered, and objective and accurate judgment is conveniently made when the health condition of the retired battery is evaluated.
Further, the ACR is the AC internal resistance of the retired battery and is obtained through a high-precision voltage internal resistance tester;
the said
Figure SMS_15
For the instantaneous polarized internal resistance of the direct current discharge of the retired battery, < + >>
Figure SMS_16
Internal resistance after steady direct current discharge for retired battery;
Figure SMS_17
and->
Figure SMS_18
And in the discharging test of the power quantity preset in the preset time through the retired battery, the voltage drop in different time periods is divided by the current to obtain, wherein the preset time is 1S-30S, and the preset multiple is 1C-3C.
Further, when the coarse cycle number value of the retired battery is determined in the SOC interval, the battery characteristic parameter corresponds to the battery characteristic parameter in the battery characteristic parameter database and is valued nearby upwards to determine the corresponding coarse cycle number value.
Further, the method further comprises the following steps:
according to the capacity evaluation result of the retired battery, when the battery capacity evaluation result exceeds 60%, judging that the retired battery belongs to the echelon use, and when the battery capacity evaluation result is lower than 60%, judging that the retired battery belongs to the regeneration use.
Through the design, after the echelon use or the regeneration use of the retired battery is judged according to the retired battery, if the use is the echelon use, the residual value evaluation of the battery is determined by combining the type, the supply and demand quantity and the basic information of the battery as correction parameters on the basis of the capacity evaluation result of the battery.
For the recycling purpose, final residual value evaluation is determined based on data of various metal contents in the battery, supply and demand amounts for various metals, and processing difficulty.
In a second aspect, an embodiment of the present application provides a rapid retired battery capacity detection and assessment system, including a background processing system, a detection terminal and a mobile receiving terminal, where the detection terminal includes a main control board, a communication module, a power module and a detection module, where the background processing system stores a basic database, and the basic database includes a battery characteristic parameter database and a capacity comparison database;
the detection module is used for detecting the battery core of the retired battery and transmitting the detected battery characteristic parameters to the main control board;
the main control board is used for transmitting the battery characteristic parameters to the background processing system through the communication module, and transmitting the battery capacity evaluation result received from the background processing system to the mobile receiving end through the communication module;
the communication module is used for sending battery characteristic parameters to the background processing system, receiving battery capacity evaluation results and outputting the battery capacity evaluation results to the mobile receiving end;
the power supply module is used for supplying power to the detection terminal;
the background processing system is used for calculating battery capacity evaluation results through a battery characteristic parameter database and a capacity comparison database in the basic database, and transmitting the battery capacity evaluation results to the communication module;
the mobile receiving terminal is used for receiving the battery capacity evaluation result transmitted by the communication module.
Further, a display module and an information input module are also arranged;
the information input module is used for inputting production information of the battery and transmitting the production information to the background processing system through the communication module;
the basic database of the background processing system is also stored with a battery key parameter database corresponding to battery materials, battery sizes and battery standard capacity information of the battery;
the display module is used for displaying battery materials, battery size, battery standard capacity information and battery capacity evaluation results received by the background processing system.
The invention has the following beneficial effects:
according to the method for rapidly detecting and evaluating the capacity of the retired battery, provided by the invention, the battery characteristic parameters of the battery core, which relate to the charge and discharge functions, are obtained through rapid detection of the retired battery core, the current SOC interval of the battery is preferentially determined, the cycle times and the battery capacity evaluation result are rapidly obtained by comparing the battery characteristic parameter database with the capacity comparison database, and the detection speed of the battery characteristic parameters in a short time is also increased as much as possible compared with the detection speed of the complete charge and discharge capacity test.
In the preferred scheme of the method, through the setting of the corresponding weight of the battery characteristic parameters, the relation between the battery cycle times and the battery characteristic parameters is more accurately indicated, so that the subsequent battery capacity is more accurate.
The capacity rapid detection and evaluation system for the retired battery provided by the invention can rapidly detect the battery cells of the retired battery, is convenient to carry, and is convenient for a practitioner to rapidly detect and evaluate the retired battery on site.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a method for rapidly detecting and evaluating capacity of retired batteries according to a preferred embodiment of the invention;
FIG. 2 is a schematic diagram showing a cycle-dependent curve corresponding to a battery characteristic parameter of a method for rapidly detecting and evaluating capacity of a retired battery according to a preferred embodiment of the present invention;
fig. 3 is a block diagram of a retired battery capacity rapid detection and assessment system according to a preferred embodiment of the present invention.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
Example 1
Referring to fig. 1, an embodiment of the present application provides a method for rapidly detecting and evaluating capacity of a retired battery, including:
step 1: carrying out a preset rate discharge test on the battery cell to be tested to obtain characteristic parameters of the battery; the battery characteristic parameters include OCV (retired battery open circuit voltage), ACR (retired battery AC internal resistance),
Figure SMS_19
(retired battery DC discharge instant polarized internal resistance)And +.>
Figure SMS_20
Data (internal resistance after steady DC discharge of retired battery).
In this embodiment, a discharge treatment with a current of 2C (5A) and a time length of 11S is performed on a ternary lithium ion retired battery, OCV data is obtained through a voltage test, ACR data is obtained through a high-precision voltage internal resistance tester, and a voltage drop divided by the current during 0-1S is performed within 11S of the discharge treatment
Figure SMS_21
The internal voltage drop during the period 5-11S divided by the current is +.>
Figure SMS_22
It should be noted that ACR,/c>
Figure SMS_23
And->
Figure SMS_24
The units are mΩ, and therefore, at the end of the calculation, they are multiplied by 1000.
Figure SMS_25
；
Figure SMS_26
；
According to the operation, the ternary lithium ion retired battery has OCV data of 4.1762V and ACR data of 30.25mΩ in charge and discharge test,
Figure SMS_27
data are 44.02mΩ ->
Figure SMS_28
The data were 3.44mΩ.
Step 2: according to the obtained OCV data, comparing the OCV data with an established battery characteristic parameter database, and determining a corresponding SOC (retired battery state of charge) interval of retired battery OCV data; the battery characteristic parameter database in this embodiment is a database containing the corresponding relationship between OCV data and battery SOC interval.
In the implementation of this embodiment, the establishment of the battery characteristic parameter database includes the following steps:
step 2.1: carrying out full-life charge-discharge experiments on a plurality of ternary lithium ion retired batteries in a laboratory environment, collecting current SOC values and current battery characteristic parameters once for all ternary lithium ion retired batteries after every 10 charge-discharge cycles, and obtaining OCV, ACR,
Figure SMS_29
and +.>
Figure SMS_30
Data.
Step 2.2: dividing the SOC intervals between 0% and 100% of the SOC values according to 10% of one SOC interval, recording corresponding battery characteristic parameters corresponding to the obtained SOC intervals, and establishing a battery characteristic parameter database (see the following table 1) corresponding to different battery characteristic parameters in different SOC intervals along with the increase of the cycle times.
Referring to table 1, in table 1, only relevant data of battery characteristic parameters of the ternary lithium ion battery in the 80% -90% soc interval and the 90% -100% soc interval are published for some reasons, and a person skilled in the art can measure complete data according to the step of establishing the battery characteristic parameter database in this embodiment.
According to the obtained OCV data of 4.1762V, corresponding to a battery characteristic parameter database, the value range of the corresponding OCV data in the corresponding battery parameter database in the range of 90% -100% SOC is 4.170V-4.178V, and the SOC range is initially determined to be 90% -100%.
Note that: in Table 1, only the section corresponding to the OCV data of 4.170V-4.178V is intercepted, and the complete 90% -100% SOC section corresponds to the OCV data of 4.05V-4.178V (along with the increase of the battery cycle times).
Table 1: battery characteristic parameter database
Figure SMS_31
Step 3: the SOC interval of the retired battery determined according to the step 2 is combined with the acquired ACR,
Figure SMS_32
And +.>
Figure SMS_33
The data is secondarily compared with an established battery characteristic parameter database, and the cycle times of the retired battery are further determined in the SOC interval; the battery characteristic parameter database in this embodiment further includes ACR and +.>
Figure SMS_34
、/>
Figure SMS_35
Data and cycle number correspondence.
With ACR data of 30.25mΩ,
Figure SMS_36
data are 44.02mΩ ->
Figure SMS_37
The data is 3.44mΩ, and ACR and +_L corresponding to the 80% -90% SOC interval and the 90% -100% SOC interval>
Figure SMS_38
And +.>
Figure SMS_39
And (3) carrying out secondary comparison on the data, and finally, determining that the SOC interval corresponding to the retired battery OCV data of 4.1762V is 90% -100%.
In other embodiments of the present invention (e.g., after battery type replacement), depending on the SOC interval corresponding to the OCV data of the retired battery, the extremum of the OCV data corresponding to the adjacent SOC interval may have a range of values that overlap each other, if two SOC intervals are simultaneously corresponding, the SOC is determined to be equal to the SOC value,
Figure SMS_40
、/>
Figure SMS_41
And (3) further determining an SOC (state of charge) section by secondary comparison, if the value is lower than the OCV data corresponding to all the SOC sections, proving that the battery is damaged, and the charging and discharging functions cannot be completed, directly judging that the battery belongs to the regeneration purpose, and if a plurality of similar OCV data exist in the determined SOC sections, taking a value downwards nearby.
According to the battery characteristic parameter database, when the OCV data of the retired battery cell with the SOC interval of 90% -100% is 4.1762V, the ACR data is 30.25mΩ, the corresponding cycle number is 60,
Figure SMS_42
the data is 44.02mΩ, the corresponding cycle number is 10 times, ++>
Figure SMS_43
The data is 3.44mΩ, the corresponding upward nearest value is 3.44mΩ, and the corresponding number of cycles is 100.
Based on the acquired ACR,
Figure SMS_44
And +.>
Figure SMS_45
The data respectively obtain corresponding coarse values of the cycle times in the battery characteristic parameter database, and the coarse values are respectively matched with ACR and +.>
Figure SMS_46
And +.>
Figure SMS_47
Multiplying the weights corresponding to the data, and adding to obtain the cycle times of the retired battery.
Multiplying the acquired circulation times corresponding to the characteristic parameters by weights, and adding the multiplied circulation times to acquire the circulation times of the retired battery.
Figure SMS_48
24。
Referring to fig. 2, the weight of each characteristic parameter is determined according to the increasing trend of the test value of the battery cycle attenuation, specifically, the increasing proportion of the ACR data is 20% when the charging and discharging cycle is stopped relative to the charging and discharging cycle starting from the beginning of the charging and discharging cycle until the ending of the charging and discharging cycle,
Figure SMS_49
the data increase ratio is 160%,>
Figure SMS_50
the data increment ratio is 20%, and the weight ratio corresponding to the three battery characteristic parameters is 20%:160% >: 20% = 1:8:1.
Step 4: according to the acquired cycle times, combining an established capacity comparison database to acquire a retired battery capacity evaluation result; the capacity comparison database is a database containing the corresponding relation between the circulation times and the capacity.
When the method is implemented, the capacity comparison database establishes capacity comparison databases of different circulation charge and discharge times corresponding to different retired battery capacities according to the average value of the total circulation charge and discharge times of the retired batteries in the full-life charge and discharge experiments of the retired batteries.
Referring to table 2, the number of the retired battery cycles was found to be 24, and the nearest value was found to be 30, based on the capacity comparison database and the measurement, to obtain 100.00% of the retired battery capacity evaluation result.
Table 2: capacity comparison database
Figure SMS_51
Judging whether the retired battery belongs to echelon use or regeneration use according to the retired battery capacity evaluation result.
The capacity of the obtained retired battery cell is evaluated to be 100.00%, more than 60%, and the battery cell is determined to be used in a gradient manner.
When the capacity of the other retired battery cell is evaluated, if the obtained evaluation is 60%, the retired battery is judged to belong to the regeneration purpose.
And (5) respectively combining various metal contents of the retired battery and basic conditions of the retired battery according to different purposes of the retired battery to further evaluate.
The ternary lithium battery is inquired to be cylindrical, the production time is 2018, and the ternary lithium battery corresponds to a manufacturer and a production process, and the comprehensive residual value of the retired battery can be further evaluated by combining the conditions.
The comprehensive residual value evaluation is carried out according to the battery performance and the basic condition of the battery, the residual value of the battery is more accurate and clear, and the reasonable retired battery processing residual value evaluation is provided for recovery personnel and processing parties.
Through the design of the battery characteristic parameter database and the capacity comparison database, the corresponding relation between all battery characteristic parameters of the retired battery and the SOC value, the circulation times of the retired battery and the capacity of the retired battery under different use degrees is obtained, all conditions of the retired battery are comprehensively covered, and objective and accurate judgment is conveniently made when the state of health of the retired battery is evaluated.
Example 2
Referring to fig. 3, the embodiment of the application further provides a rapid retired battery capacity detection and evaluation system, which comprises a background processing system, a detection terminal and a mobile receiving terminal, wherein the detection terminal comprises a main control board, a communication module, a power module, a detection module and a mobile receiving terminal, the background processing system stores a basic database, and the basic database comprises a battery characteristic parameter database and a capacity comparison database;
the detection module is used for detecting the battery core of the retired battery and transmitting the detected battery characteristic parameters to the main control board;
the main control board is used for transmitting the battery characteristic parameters to the background processing system through the communication module, and transmitting the battery capacity evaluation results received from the background processing system to the mobile receiving end through the communication module;
the communication module is used for sending the battery characteristic parameters to the background processing system, receiving the battery capacity evaluation result and outputting the battery capacity evaluation result to the mobile receiving end;
the power module is used for supplying power to the detection terminal;
the background processing system is used for calculating battery capacity evaluation results through a battery characteristic parameter database and a capacity comparison database in the basic database and transmitting the battery capacity evaluation results to the communication module;
and the mobile receiving terminal is used for receiving the battery capacity evaluation result transmitted by the communication module.
In the implementation process of the embodiment, the detection module detects the battery core of the retired battery, and the OCV, ACR, the battery core of the retired battery,
Figure SMS_52
And +.>
Figure SMS_53
The data is transmitted to the main control board, and is transmitted to the background processing system through the communication module, and the background processing system determines the approximate SOC interval of the retired battery cell through the OCV data of the retired battery through the stored battery characteristic parameter database, and the background processing system passes through the ACR and the ACR>
Figure SMS_54
And +.>
Figure SMS_55
The data are subjected to secondary comparison, after the SOC interval is determined again, each ACR and each ++in the SOC interval are used for the data>
Figure SMS_56
And +.>
Figure SMS_57
The circulation coarse value corresponding to the data is multiplied by the weight stored in the basic database, and then the circulation times are added to determine the circulation times, the battery capacity is determined according to the obtained circulation times and the capacity comparison database stored in the basic database, and the battery capacity evaluation result is transmitted to the mobile receiving terminal through the functions of short messages, networking and the like of the communication module, so that the staff is rapidly notified.
In this embodiment, a display module and an information input module are further provided.
The information input module is used for inputting production information of the battery and transmitting the production information to the background processing system through the communication module.
The basic database of the background processing system also stores a battery key parameter database of battery production information corresponding to battery materials, battery sizes and battery standard capacity information.
And the display module is used for displaying the battery materials, the battery size, the battery standard capacity information and the battery capacity evaluation result which are received by the background processing system.
The production information of the retired battery is input to the information input module by a worker from the information input module, the production information is transmitted to the background processing system through the communication module, battery materials, battery sizes and battery standard capacity information of the retired battery are obtained through comparison of the battery key parameter database, and then the information is displayed on the display module.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (10)

1. The method for rapidly detecting and evaluating the capacity of the retired battery is characterized by comprising the following steps:
step 1: carrying out a preset rate discharge test on the battery cell to be tested to obtain characteristic parameters of the battery; the battery characteristic parameters include OCV, ACR,
Figure QLYQS_1
And +.>
Figure QLYQS_2
Data;
step 2: according to the obtained OCV data, comparing the OCV data with an established battery characteristic parameter database, and determining a corresponding SOC section of the retired battery OCV data; the battery characteristic parameter database is a database containing the corresponding relation between the OCV data and the battery SOC interval;
step 3: the SOC interval of the retired battery determined according to the step 2 is combined with the acquired ACR,
Figure QLYQS_3
And +.>
Figure QLYQS_4
The data is subjected to secondary comparison with an established battery characteristic parameter database, and the cycle times of the retired battery are further determined in an SOC interval; the battery characteristic parameter database also comprises ACR and/or->
Figure QLYQS_5
、/>
Figure QLYQS_6
The corresponding relation between the data and the cycle times;
step 4: according to the acquired cycle times, combining an established capacity comparison database to acquire a retired battery capacity evaluation result; the capacity comparison database is a database containing the corresponding relation between the circulation times and the capacity.
2. The method of claim 1, further comprising the specific operation of determining the number of cycles of the retired battery cell comprising: based on the acquired ACR,
Figure QLYQS_7
And +.>
Figure QLYQS_8
The data respectively obtain the corresponding rough values of the cycle times in the battery characteristic parameter database, and then respectively and respectively match with ACR and +.>
Figure QLYQS_9
And +.>
Figure QLYQS_10
Multiplying the weights corresponding to the data, and adding to obtain the cycle times of the retired battery.
3. The method for rapidly detecting and evaluating capacity of retired battery according to claim 2, wherein the weight of each characteristic parameter is determined according to the increasing trend of the test value of battery cycle degradation.
4. The method for rapidly detecting and evaluating capacity of a retired battery according to claim 1, wherein when the SOC interval corresponding to the OCV data of the retired battery is determined, if the SOC interval is two corresponding SOC intervals at the same time, the SOC interval is further determined by the secondary comparison, if the SOC interval is lower than the OCV data corresponding to all SOC intervals, the battery is directly determined to be in regeneration use, and if a plurality of similar OCV data exist in the determined SOC interval, the SOC interval is taken down nearby;
during secondary comparison, ACR can also be used,
Figure QLYQS_11
And +.>
Figure QLYQS_12
The data verifies the SOC interval corresponding to the retired battery OCV data;
when the retired battery capacity evaluation result is obtained, the obtained circulation times correspond to the circulation times in the capacity comparison database, and the corresponding retired battery capacity evaluation result is determined by taking the values nearby upwards.
5. The method for rapidly detecting and evaluating capacity of retired battery according to claim 1, wherein the establishing of the battery characteristic parameter database and the capacity comparison database comprises the following steps:
performing full-life charge-discharge experiments on a plurality of retired batteries, wherein each interval is presetCollecting current SOC values and current battery characteristic parameters of all retired batteries once after charge and discharge cycles of cycle times, and finally obtaining corresponding OCV, ACR, battery voltage and battery voltage of a plurality of retired batteries at different SOC values,
Figure QLYQS_13
And +.>
Figure QLYQS_14
Data;
dividing an SOC interval between 0% and 100% of SOC values according to a preset ratio, recording corresponding battery characteristic parameters of the obtained SOC value corresponding to the SOC interval, and establishing a battery characteristic parameter database corresponding to different battery characteristic parameters in different SOC intervals along with the increase of cycle times;
and establishing a capacity comparison database corresponding to different retired battery capacities of different cyclic charge and discharge times according to the average value of the total cyclic charge and discharge times of the retired batteries in the full-life charge and discharge experiments of the retired batteries.
6. The rapid detection and evaluation method for capacity of retired battery according to claim 1, wherein the ACR is ac internal resistance of retired battery, obtained by a high-precision voltage internal resistance tester;
the said
Figure QLYQS_15
For the instantaneous polarized internal resistance of the direct current discharge of the retired battery, < + >>
Figure QLYQS_16
Internal resistance after steady direct current discharge for retired battery;
Figure QLYQS_17
and->
Figure QLYQS_18
In the discharge test of the electric quantity preset in the preset time through the retired battery, the voltage drop of different time periods is divided by the currentObtaining, wherein the preset time range is 1S-30S, and the preset multiple range is 1C-3C.
7. The method for rapidly detecting and evaluating capacity of a retired battery according to claim 2, wherein when determining the rough cycle number value of the retired battery in the SOC interval, the battery characteristic parameter corresponds to the rough cycle number value determined by taking the battery characteristic parameter up to a nearby value in the battery characteristic parameter database.
8. The retired battery capacity rapid detection and assessment method according to claim 1, further comprising:
according to the capacity evaluation result of the retired battery, when the battery capacity evaluation result exceeds 60%, judging that the retired battery belongs to the echelon use, and when the battery capacity evaluation result is lower than 60%, judging that the retired battery belongs to the regeneration use.
9. The rapid retired battery capacity detection and evaluation system is characterized by comprising a background processing system, a detection terminal and a mobile receiving terminal, wherein the detection terminal comprises a main control board, a communication module, a power module and a detection module, the background processing system stores a basic database, and the basic database comprises a battery characteristic parameter database and a capacity comparison database;
the detection module is used for detecting the battery core of the retired battery and transmitting the detected battery characteristic parameters to the main control board;
the main control board is used for transmitting the battery characteristic parameters to the background processing system through the communication module, and transmitting the battery capacity evaluation result received from the background processing system to the mobile receiving end through the communication module;
the communication module is used for sending battery characteristic parameters to the background processing system, receiving battery capacity evaluation results and outputting the battery capacity evaluation results to the mobile receiving end;
the power supply module is used for supplying power to the detection terminal;
the background processing system is used for calculating battery capacity evaluation results through a battery characteristic parameter database and a capacity comparison database in the basic database, and transmitting the battery capacity evaluation results to the communication module;
the mobile receiving terminal is used for receiving the battery capacity evaluation result transmitted by the communication module.
10. The system according to claim 9, further comprising a display module and an information entry module;
the information input module is used for inputting production information of the battery and transmitting the production information to the background processing system through the communication module;
the basic database of the background processing system is also stored with a battery key parameter database corresponding to battery materials, battery sizes and battery standard capacity information of the battery;
the display module is used for displaying battery materials, battery size, battery standard capacity information and battery capacity evaluation results received by the background processing system.
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