CN112871759B - Lithium battery voltage drop evaluation method and system - Google Patents
Lithium battery voltage drop evaluation method and system Download PDFInfo
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- CN112871759B CN112871759B CN202110038037.3A CN202110038037A CN112871759B CN 112871759 B CN112871759 B CN 112871759B CN 202110038037 A CN202110038037 A CN 202110038037A CN 112871759 B CN112871759 B CN 112871759B
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Abstract
The invention provides a lithium battery voltage drop evaluation method, which comprises the following steps: s1: calculating the voltage drop of each tray battery, and calculating the tolerance of the upper limit and the lower limit of the voltage drop of the battery in the tray; s2: obtaining an average value of pressure drop in each tray; s3: calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance obtained in the step S1 and the average value of the pressure drop obtained in the step S2; s4: and (4) comparing the battery voltage drop data in each tray with the upper and lower limit standards obtained in the step (S3). The lithium battery voltage drop evaluation method provided by the invention solves the problem of inaccurate voltage drop evaluation caused by unified statistical calculation of batteries produced in batches or in one day in the prior art, and improves the accuracy of voltage drop judgment of each battery by respectively setting voltage drop standards for the batteries in each tray and selecting the voltage drops by taking the tray as a unit.
Description
Technical Field
The invention belongs to the field of lithium battery manufacturing, and particularly relates to a lithium battery voltage drop evaluation method and system.
Background
Lithium batteries are inevitably subjected to voltage drop due to chemical reaction or internal micro-short circuit due to structural and manufacturing limitations. The detection is needed after the processing of the lithium battery is finished, the battery which is not in accordance with the pressure drop standard is detected, otherwise, the service time of the battery is seriously influenced, the consistency among the batteries is further influenced, the grouping rate is reduced, and the service power and the service life of the grouped batteries are reduced.
At present, the method generally adopted in the industry is high temperature plus normal temperature standing, the voltage difference before and after the standing of batteries produced in a batch or a day is tested, and the batteries with the difference exceeding the standard difference parameter are selected as unqualified products. The method has certain problems that aging is carried out in a large environment, the pressure drop condition among batteries is different, some pressure drops are not reflected greatly, and some pressure drops are amplified to be unqualified products, so that the subsequent matching is influenced.
The battery which is not selected out due to large voltage drop can cause over-quick voltage drop and short service time in the subsequent use process. If the batteries are assembled, the consistency of the batteries is poor, so that the overall power and the service life are influenced. In addition, the batteries with qualified pressure drop are regarded as unqualified products due to the environmental difference of each tray, and unnecessary loss is caused.
Therefore, it is desirable to provide an evaluation method for lithium battery voltage drop, which can more accurately evaluate the voltage drop of each battery, so as to avoid erroneous judgment caused by simultaneous detection of a large number of batteries in the prior art.
Disclosure of Invention
In order to solve the problems, the invention provides a lithium battery voltage drop evaluation method and a lithium battery voltage drop evaluation system.
In order to achieve the above object, the present invention provides a lithium battery voltage drop evaluation method, which comprises the following steps:
s1: calculating the voltage drop of each tray battery, and calculating the upper and lower limit tolerance of the voltage drop of the battery in the tray;
s2: obtaining an average value of pressure drop in each tray;
s3: calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance obtained in the step S1 and the average value of the pressure drop obtained in the step S2;
s4: and (4) comparing the cell voltage drop data in each tray with the upper and lower limit standards obtained in the step (S3).
The lithium battery voltage drop evaluation method provided by the invention is also characterized in that the calculation method of the voltage drop value K of each tray battery in the S1 is as follows:
K＝(OCV1-OCV2)/(t1-t2)
here, OCV1 is the open circuit voltage of the battery detected at time t1, and OCV2 is the open circuit voltage of the battery detected at time t 2.
The lithium battery voltage drop evaluation method provided by the invention also has the characteristic that the upper and lower limit standards in S3 meet the statistical data obeying or approximately obeying normal distribution, and the voltage drop value covered by the upper and lower limit standards is not less than 99.73% of all the voltage drop values.
The lithium battery voltage drop evaluation method provided by the invention is also characterized in that the upper and lower limit standard = the voltage drop average value + the upper and lower limit tolerance in S3.
The invention also aims to provide a lithium battery voltage drop evaluation system which comprises an automatic feeding and discharging assembly and a battery testing assembly, wherein the automatic feeding and discharging assembly is in data connection with the battery testing assembly through a serial PLC.
The lithium battery voltage drop evaluation system provided by the invention is also characterized in that the automatic loading and unloading assembly comprises a carrying hand for loading and unloading.
The lithium battery voltage drop evaluation system provided by the invention is also characterized in that the battery testing assembly comprises a testing module and a control module, wherein the control module is respectively connected with the testing module and the automatic loading and unloading assembly and is used for controlling the testing module to test the battery, generating a working command according to a testing result, sending the working command to the automatic loading and unloading assembly and controlling the automatic loading and unloading assembly to work.
The lithium battery voltage drop evaluation system provided by the invention also has the characteristics that the test module is further configured to execute the following operations:
detecting the voltage drop of each tray cell, and calculating the upper and lower limit tolerance and the average value of the voltage drop;
calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance and the average value of the pressure drop;
comparing the battery voltage drop data in each tray with the upper and lower limit standards;
if the voltage drop of the battery in the tray is within the upper and lower limit standards, sending OK to the control module;
and if the voltage drop of a certain battery in the tray is not within the upper and lower limit standards, judging that the battery is abnormal, and sending NG to the control module.
The lithium battery voltage drop evaluation system provided by the invention is also characterized in that the abnormal battery in the abnormal tray is manually picked up and replaced by a new battery to carry out detection again until the test module obtains an OK result.
Has the advantages that:
the lithium battery voltage drop evaluation method provided by the invention solves the problem of inaccurate voltage drop evaluation caused by unified statistical calculation of batteries produced in batches or in one day in the prior art, and improves the accuracy of voltage drop judgment of each battery by respectively setting voltage drop standards for the batteries in each tray and selecting the voltage drops by taking the tray as a unit.
Drawings
Fig. 1 is a schematic diagram of a working flow of a lithium battery voltage drop evaluation system provided by the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
A lithium battery voltage drop evaluation method is characterized by comprising the following steps:
s1: calculating the voltage drop of each tray battery, and calculating the tolerance of the upper limit and the lower limit of the voltage drop of the battery in the tray:
the method for calculating the voltage drop value K of each tray cell is as follows:
K＝(OCV1-OCV2)/(t1-t2)
wherein OCV1 is the open circuit voltage of the battery detected at the time t1, and OCV2 is the open circuit voltage of the battery detected at the time t 2;
s2: obtaining an average value of pressure drop in each tray;
s3: calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance obtained in the step S1 and the average value of the pressure drop obtained in the step S2;
s4: and (4) comparing the battery voltage drop data in each tray with the upper and lower limit standards obtained in the step (S3).
In some embodiments, the upper and lower limit criteria in S3 satisfy that the statistical data obeys or approximately obeys a normal distribution, and the upper and lower limit criteria cover not less than 99.73% of all the pressure drop values. Upper and lower bound standard = mean of pressure drop + tolerance of upper and lower bound. The adjustment of the specific tolerance needs to finally determine the tolerance of the upper limit and the lower limit of the voltage drop according to the actual state of the battery, the requirement of battery consistency (the power battery needs to be matched and has corresponding strict consistency requirement), the battery test result and other considerations.
In some embodiments of the invention, the lithium battery voltage drop evaluation system is characterized by comprising an automatic loading and unloading assembly and a battery testing assembly, wherein the automatic loading and unloading assembly is in data connection with the battery testing assembly through a serial PLC. The automatic feeding and discharging assembly comprises a carrying hand used for feeding and discharging. The battery testing assembly comprises a testing module and a control module, wherein the control module is respectively connected with the testing module and the automatic feeding and discharging assembly and is used for controlling the testing module to test the battery, generating a working command according to a testing result, sending the working command to the automatic feeding and discharging assembly and controlling the automatic feeding and discharging assembly to work. The test module is further configured to perform the following operations: detecting the voltage drop of each tray cell, and calculating the upper and lower limit tolerance and the average value of the voltage drop; calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance and the average value of the pressure drop; comparing the battery voltage drop data in each tray with the upper and lower limit standards; if the voltage drop of the battery in the tray is within the upper and lower limit standards, sending OK to the control module; and if the voltage drop of a certain battery in the tray is not within the upper and lower limit standards, judging that the battery is abnormal, and sending NG to the control module. And the abnormal battery in the abnormal tray is manually picked up, and the abnormal battery is replaced by a new battery for re-detection until the test module obtains an OK result.
As shown in FIG. 1, the test module is respectively provided with OCV # 1, OCV # 2, OCVx + n, OCVx and other information windows, and the voltage drop is respectively detected and calculated. And after the tray battery test is finished, the test module judges the result and uploads the result to the control module, and the control module feeds back information to the F-PLC. In addition, the test module reads the ID of the current tray at the same time, judges whether the battery in the tray is abnormal or not, and sends OK if the battery is proper and sends NG if the battery is improper. The tray can be selected to add a mechanical picking function or manually pick out the bad batteries until the system sends OK, and then the tray can be moved to the next step. And after the abnormal tray picks out the defective battery, marking the defective battery, and binding the newly added battery with the tray ID to cover the previous tray ID information.
The control system controls the automatic operation of the tray clamp, information interaction is carried out on the PLC and the test module, the carrying hands are controlled, the tray is placed in the test cabinet, after the test is finished, the tray is transferred to the standing frame, data exchange and grouping are carried out according to the test result, and the carrying hands are controlled to feed and discharge.
The system obtains voltage data uploaded by an upper computer, automatically selects two measurement results of the tray to obtain a voltage difference value, sends the voltage drop delta V of the battery in the tray to be greater than or equal to the upper and lower limit standard voltage drop (delta Vmean +/-V tolerance) as an NG signal, feeds the NG signal back to the test system, marks the corresponding battery, and picks out the corresponding battery in a corresponding process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A lithium battery voltage drop evaluation method is characterized by comprising the following steps:
s1: calculating the voltage drop of each tray battery, and calculating the tolerance of the upper limit and the lower limit of the voltage drop of the battery in the tray;
s2: obtaining an average value of pressure drop in each tray;
s3: calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance obtained in the step S1 and the average value of the pressure drop obtained in the step S2;
s4: comparing the battery voltage drop data in each tray with the upper and lower limit standards obtained in the step S3, and if the battery voltage drops in the trays are within the upper and lower limit standards, judging that the trays are qualified; if the voltage drop of a certain battery in the tray is not within the upper and lower limit standards, judging that the battery is abnormal, wherein the upper and lower limit standard = the average value of the voltage drop + the tolerance of the upper and lower limits in S3,
and the upper and lower limit standards in the S3 meet the condition that the statistical data obey or approximately obey normal distribution, and the pressure drop values covered by the upper and lower limit standards are not less than 99.73 percent of all the pressure drop values.
2. The lithium battery voltage drop evaluation method according to claim 1, wherein the voltage drop value K of each tray cell in S1 is calculated as follows:
K=（OCV 1 -OCV 2 )/（t 1 -t 2 ）
wherein the OCV 1 Is t 1 Open circuit voltage, OCV, of battery detected at a time 2 Is t 2 The open-circuit voltage of the battery detected at the time.
3. The lithium battery voltage drop evaluation system is characterized by comprising an automatic feeding and discharging assembly and a battery testing assembly, wherein the automatic feeding and discharging assembly is in data connection with the battery testing assembly through a serial PLC;
the battery testing assembly comprises a testing module and a control module, wherein the control module is respectively connected with the testing module and the automatic loading and unloading assembly and is used for controlling the testing module to test the battery, generating a working command according to a testing result, sending the working command to the automatic loading and unloading assembly and controlling the automatic loading and unloading assembly to work;
the test module is further configured to perform the following operations:
detecting the voltage drop of each tray cell, and calculating the upper and lower limit tolerance and the average value of the voltage drop;
calculating an upper limit standard and a lower limit standard according to the upper limit tolerance and the lower limit tolerance and the average value of the pressure drop;
comparing the battery voltage drop data in each tray with the upper and lower limit standards;
if the voltage drop of the battery in the tray is within the upper and lower limit standards, sending OK to the control module;
if the voltage drop of a certain battery in the tray is not within the upper and lower limit standards, the tray is judged to be abnormal, NG is sent to the control module,
the upper and lower limit standards meet the condition that the statistical data obeys or approximately obeys normal distribution, and the pressure drop value covered by the upper and lower limit standards is not less than 99.73 percent of all the pressure drop values.
4. The lithium battery voltage drop evaluation system of claim 3, wherein the automatic loading and unloading assembly comprises a handler for loading and unloading.
5. The lithium battery voltage drop evaluation system of claim 3, wherein the abnormal batteries in the abnormal tray are manually picked up and replaced with new batteries for re-testing until the test module obtains an OK result.
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Effective date of registration: 20220914 Address after: 421681 Jinwei Road, Guiyang Industrial Park, Qidong County, Hengyang City, Hunan Province Applicant after: Hunan lingpaidazhi Technology Co.,Ltd. Applicant after: Hunan Lingpai New Energy Technology Co.,Ltd. Applicant after: Hengyang Lingpai New Energy Technology Co.,Ltd. Applicant after: Suzhou Lingpai New Energy Technology Co.,Ltd. Applicant after: Hunan Lingpai Dingxin Battery Research Institute Co.,Ltd. Address before: 215335 station 62, room 404, science and Technology Plaza building, East Qianjin Road, Kunshan Development Zone, Suzhou City, Jiangsu Province (cluster registration) Applicant before: Suzhou Lingpai New Energy Technology Co.,Ltd. Applicant before: Sichuan xinminya Battery Technology Co.,Ltd. Applicant before: Hunan Lingpai New Energy Technology Co.,Ltd. |
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Effective date of registration: 20230511 Address after: 421681 Jinwei Road, Guiyang Industrial Park, Qidong County, Hengyang City, Hunan Province Patentee after: Hunan lingpaidazhi Technology Co.,Ltd. Patentee after: Hunan Lingpai New Energy Technology Co.,Ltd. Patentee after: Hengyang Lingpai New Energy Technology Co.,Ltd. Patentee after: Hunan Lingpai New Energy Research Institute Co.,Ltd. Patentee after: Hunan Lingpai Energy Storage Technology Co.,Ltd. Address before: 421681 Jinwei Road, Guiyang Industrial Park, Qidong County, Hengyang City, Hunan Province Patentee before: Hunan lingpaidazhi Technology Co.,Ltd. Patentee before: Hunan Lingpai New Energy Technology Co.,Ltd. Patentee before: Hengyang Lingpai New Energy Technology Co.,Ltd. Patentee before: Suzhou Lingpai New Energy Technology Co.,Ltd. Patentee before: Hunan Lingpai Dingxin Battery Research Institute Co.,Ltd. |