CN111282852A - Test screening and grade judging method for lithium ion battery - Google Patents
Test screening and grade judging method for lithium ion battery Download PDFInfo
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- CN111282852A CN111282852A CN202010106373.2A CN202010106373A CN111282852A CN 111282852 A CN111282852 A CN 111282852A CN 202010106373 A CN202010106373 A CN 202010106373A CN 111282852 A CN111282852 A CN 111282852A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
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Abstract
The invention discloses a test screening and grade judging method of a lithium ion battery, which comprises the following steps: firstly, for a plurality of lithium ion batteries to be tested, adjusting the SOC of the batteries to 10% -15% through charging and discharging operations; and secondly, sequentially carrying out IROCV (internal resistance control circuit) test on the plurality of batteries, judging the grades of the batteries into three grades of qualified products, undetermined products and defective products, and respectively executing different preset operations on the batteries with different grades. The invention discloses a test screening and grade judging method of a lithium ion battery, which is characterized in that in the scanning test process, instant grade judging operation is added, the grade of the battery is changed into three types of qualified products, undetermined products and defective products, the undetermined products do not need to be subjected to secondary re-screening process by obviously and effectively distinguishing the defective products, secondary reworking in the process is avoided, the production efficiency is effectively improved, the process loss cost is reduced, and the method is easy to popularize and apply.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a test screening and grade judging method of a lithium ion battery.
Background
At present, lithium ion batteries have been widely used in the fields of digital products, electric vehicles and energy storage due to their advantages of high energy density, good cycle performance, green and no pollution.
In the production process of the cylindrical lithium ion battery, before shipment, a code scanning test needs to be carried out on the battery to confirm whether the internal resistance, the voltage, the capacity grading and the like of the battery meet requirements or not, and the battery is divided into qualified products and unqualified products after the scanning test, wherein the qualified products are normally shipped, and the unqualified products need to be screened again. In the original process, unqualified products mainly mean that the internal resistance and the voltage of the battery do not meet the assembly requirements of shipment, and the sorting test needs to be carried out again. The specific operation flow is as follows:
defective batteries → charge and discharge test → aging storage → IROCV test (i.e. internal resistance voltage test) → grading → visual inspection → code scanning test → packaging → delivery.
From the above operation flows, it can be clearly seen that, in the operation process, the secondary screening flow for the unqualified products mainly needs to eliminate the internal resistance inferior products and the voltage inferior products, wherein the internal resistance inferior products can be eliminated through the code scanning test process again, and the voltage inferior products need to be eliminated through aging screening, so that the whole battery screening flow is relatively long, and the continuous operation of field operation staff and the improvement of the production efficiency are not facilitated.
Disclosure of Invention
The invention aims to provide a test screening and grade judging method of a lithium ion battery aiming at the technical defects in the prior art.
Therefore, the invention provides a test screening and grade judging method of a lithium ion battery, which comprises the following steps:
firstly, for a plurality of lithium ion batteries to be tested, adjusting the SOC of the batteries to 10% -15% through charging and discharging operations;
secondly, sequentially carrying out IROCV (infrared absorption capacity control) test on a plurality of batteries, and then judging the grade of the batteries into three grades of qualified products, undetermined products and defective products, wherein the batteries with the open-circuit voltage lower than a preset qualified voltage value are used as defective batteries; taking the battery with the internal resistance not within the preset qualified resistance value interval as a battery to be determined; and taking other batteries as qualified batteries, and then respectively executing different preset processing operations on batteries with different grades.
In the second step, the internal resistance test operation is carried out again on the battery to be determined, whether the internal resistance of the battery to be determined is within the preset qualified resistance value interval is judged again, and if yes, the grade of the battery to be determined is changed into the grade of a qualified product; otherwise, changing the grade of the battery to be determined into a defective grade.
Wherein in the second step, for defective batteries, a downshift process is performed, and for non-defective batteries, a shipping operation is performed,
in the second step, when the battery is judged to be a defective battery, a red alarm prompt box is popped up on a software interface of the display device to remind a user.
Compared with the prior art, the invention provides the test screening and grade judging method of the lithium ion battery, which adds the instant grade judging operation in the scanning test process, changes the grade of the battery into three types of qualified products, undetermined products and defective products, obviously and effectively distinguishes the defective products, does not need to carry out the secondary re-screening process on the undetermined products, avoids secondary reworking in the process, effectively improves the production efficiency, reduces the process loss cost, and is easy to popularize and apply in production and manufacturing enterprises.
For the invention, the operation and the distinguishing of operators are convenient, and when the defective products are classified, the defective products can be distinguished obviously by automatically popping up a red alarm prompt box on a software interface. Therefore, defective products needing to be removed are marked through software judgment at the first time, an alarm is given to prompt an operator to pick out the defective products, the to-be-determined products can be put into operation again, and operation processes of charging and discharging tests, aging storage, OCV tests and the like are cancelled.
By applying the invention, the operation process is simplified, the overall production efficiency of the battery is improved, the labor cost is reduced, the large-scale production is facilitated, and the application range is wide.
Drawings
Fig. 1 is a flowchart of a test screening and grade determination method for a lithium ion battery according to the present invention;
FIG. 2 is a schematic diagram of a development and application process of a lithium ion battery testing and screening and grade determination method in an embodiment of the present invention
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1 and fig. 2, the invention provides a test screening and grade determination method for a lithium ion battery, comprising the following steps:
firstly, for a plurality of lithium ion batteries to be tested, adjusting the SOC of the batteries to 10% -15% through charging and discharging operations;
secondly, sequentially carrying out IROCV tests (namely battery internal resistance and open-circuit voltage tests) on the plurality of batteries, and then judging the grades of the batteries into qualified products, undetermined products and defective products, wherein the batteries with the open-circuit voltage lower than a preset qualified voltage value are used as defective batteries; taking the battery with the internal resistance not within the preset qualified resistance value interval as a battery to be determined; and taking other batteries as qualified batteries, and then respectively executing different preset processing operations on batteries with different grades.
In the second step, specifically, for the battery to be determined, the internal resistance test operation is performed again (for example, the internal resistance test operation of the battery is performed through the existing battery code scanning test equipment), whether the internal resistance of the battery to be determined is within the preset qualified resistance value interval is judged again, and if yes, the grade of the battery to be determined is changed into the grade of a qualified product; otherwise, changing the grade of the battery to be determined into a defective grade.
It should be noted that, the code scanning test device for the battery performs the code scanning test operation on the battery, and may correspond and compare the performance data of the battery with the battery code, and then perform the check before shipment on the IR/OCV data of the battery.
In the second step, specifically, for defective batteries, a downshift process is performed, and for non-defective batteries, a shipping operation is performed,
in the second step, in concrete implementation, when the battery is judged to be a defective battery, the user can be reminded in a mode of popping up a red alarm prompt box on a software interface of the display device.
The battery IROCV test can be performed by an OCV/IR battery test handler known in the art.
It should be noted that, in view of the fact that the internal resistance of the battery is abnormal due to transportation, vibration and the like in the production process of the battery, at this time, the actual resistance of the battery may deviate from the test result, the state is undetermined, and the battery is classified as a battery to be determined, at this time, the battery needs to be subjected to a code scanning test again, and the battery with the internal resistance actually having a problem is removed.
In order to more clearly understand the technical solution of the present invention, the following description is given with reference to specific examples.
Examples are given.
As shown in the attached figure 2, on the basis of the original operation modes of grade sorting, code scanning testing and re-screening, the invention redesigns the operation flow according to the actual production requirements, perfects the operation of each process, adds a judgment function to the online instant data generated by the code scanning testing process in a data system, immediately distinguishes unqualified products and is beneficial to the rapid processing of the unqualified products.
In the original operation mode, the battery is only divided into qualified products and unqualified products after code scanning test, the qualified products are normally delivered, and the unqualified products are subjected to complete secondary re-screening processes such as charge and discharge test, aging storage, appearance inspection, test code scanning and the like again.
For the battery needing code scanning test, firstly, the state of the test battery is uniformly adjusted to 10-15% SOC through the charge and discharge test, so that the low-voltage battery can be rejected in time through the change of the battery voltage under the condition of low state of charge.
In the 0% to 15% SOC state, the battery voltage already crosses the polarization voltage region of 5% SOC, but does not reach the SOC of 30% to 40% of the corresponding stable voltage platform of the battery, and belongs to a relatively steep sensitive region with a relatively large slope in the voltage curve, which is beneficial to identifying abnormal batteries with voltage fluctuation and voltage drop. In the region, the optimum entry point of 10% -15% SOC can be determined by DOE (department of energy) as a voltage platform for OCV (open circuit control) test to perform code scanning test, batteries (defective batteries) lower than a set voltage value are removed, and batteries with abnormal internal resistance caused by transportation, vibration and the like in the production process can be picked out as batteries to be determined.
In addition, under low-power state, be favorable to the battery to carry out long-term storage, can more effectual OCV test screening of carrying out, perhaps sweep a yard qualified battery, also can carry out the secondary of different SOC electric states and mend the electricity according to customer's demand, the operation mode is more nimble.
When the battery meets the SOC state requirement, the battery is particularly realized foolproof, the grade can be changed into three types of qualified products, undetermined products and defective products by conveniently adding instant grade judgment in a data processing software system, the operation and the distinguishing of operators are facilitated, and when the defective products are classified, a red alarm prompt box is automatically popped up on a software interface to obviously distinguish the defective products.
It should be noted that, because the defective batteries (i.e. low-voltage batteries) are obviously and effectively distinguished, the secondary re-screening process (i.e. the existing process) is not required for the batteries to be determined, the operation processes such as the charge and discharge test, the aging storage, the OCV test and the like are cancelled, the secondary rework in the process is avoided, the production efficiency is effectively improved, the process loss cost is reduced, and the method is easy to popularize and apply in production and manufacturing enterprises. In the code scanning test process, defective batteries needing to be removed can be marked through software judgment at the first time, an alarm is given to prompt an operator to pick out the defective batteries, secondary input can be carried out on the defective batteries, and operation processes such as charging and discharging test, aging storage, OCV test and the like are cancelled.
By applying the invention, under the condition of determining the optimal screening SOC electric state, the test interface with the automatic alarm prompt function is developed in the software system, so that the operation process can be simplified, the production efficiency is improved, the labor cost is reduced, the large-scale production is facilitated, and the application range is wide.
Based on the above technical solutions, after applying the technical solution of the present invention, before shipment, the flow of performing the scan test on the battery is as follows:
code scanning test → instant judgment of the data processing system → judgment of grades of qualified products, undetermined products and defective products → classification according to categories → retesting of undetermined products to determine new grading standards.
The present invention relates to a process innovation of a battery data processing analysis and determination management method, and optimizes and applies a processing flow in a test sorting process. On the basis of the original operation modes of grade sorting, code scanning testing and re-screening, the invention redesigns the operation flow according to the actual production requirements, perfects the operation of each procedure, adds a judgment function in a data system through online instant data generated by the code scanning testing procedure, immediately distinguishes unqualified products and is beneficial to the rapid processing of the unqualified products. In the original operation mode, the battery is only divided into qualified products and unqualified products after code scanning test, the qualified products are normally delivered, and the unqualified products are subjected to complete secondary re-screening processes such as charge and discharge test, aging storage, appearance inspection, test code scanning and the like again. The invention can change the grade into three types of qualified products, undetermined products and defective products by adding instant grade judgment in a data processing software system, is convenient for operators to distinguish in specific operation, and can obviously distinguish by automatically popping up a red alarm prompt box on a software interface when the defective products are classified. Because the inferior-quality products are obviously and effectively distinguished, the products to be determined do not need to be subjected to the secondary re-screening process, secondary reworking in the process is avoided, the production efficiency is effectively improved, the process loss cost is reduced, and the method is easy to popularize and apply in production and manufacturing enterprises.
In summary, compared with the prior art, the test screening and grade determination method for the lithium ion battery provided by the invention has the advantages that in the scanning test process, the instant grade determination operation is added, the grade of the battery is changed into three types of qualified products, undetermined products and defective products, the undetermined products are obviously and effectively distinguished, the undetermined products do not need to be subjected to the secondary re-screening process, the secondary rework in the process is avoided, the production efficiency is effectively improved, the process loss cost is reduced, and the method is easy to popularize and apply in production and manufacturing enterprises.
For the invention, the operation and the distinguishing of operators are convenient, and when the defective products are classified, the defective products can be distinguished obviously by automatically popping up a red alarm prompt box on a software interface. Therefore, defective products needing to be removed are marked through software judgment at the first time, an alarm is given to prompt an operator to pick out the defective products, the to-be-determined products can be put into operation again, and operation processes of charging and discharging tests, aging storage, OCV tests and the like are cancelled.
By applying the invention, the operation process is simplified, the overall production efficiency of the battery is improved, the labor cost is reduced, the large-scale production is facilitated, and the application range is wide.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A test screening and grade judging method for a lithium ion battery is characterized by comprising the following steps:
firstly, for a plurality of lithium ion batteries to be tested, adjusting the SOC of the batteries to 10% -15% through charging and discharging operations;
secondly, sequentially carrying out IROCV (infrared absorption capacity control) test on a plurality of batteries, and then judging the grade of the batteries into three grades of qualified products, undetermined products and defective products, wherein the batteries with the open-circuit voltage lower than a preset qualified voltage value are used as defective batteries; taking the battery with the internal resistance not within the preset qualified resistance value interval as a battery to be determined; and taking other batteries as qualified batteries, and then respectively executing different preset processing operations on batteries with different grades.
2. The method of claim 1, wherein in the second step, the internal resistance test operation is performed again for the battery to be determined, whether the internal resistance of the battery to be determined is within the preset qualified resistance value interval is judged again, and if yes, the grade of the battery to be determined is changed into the grade of the qualified product; otherwise, changing the grade of the battery to be determined into a defective grade.
3. The method according to claim 1, wherein in the second step, a downshift process is performed for defective batteries, and a shipping operation is performed for defective batteries.
4. A method according to any one of claims 1 to 3, wherein in the second step, when the battery is judged to be a defective battery, the user is alerted by popping up a red alarm prompt box on a software interface of the display device.
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Cited By (1)
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| JP2022065323A (en) * | 2020-10-15 | 2022-04-27 | 株式会社豊田中央研究所 | Device, system, and method for measuring resistance and program therefor |
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