CN111029668A - Matching method of lithium ion power batteries - Google Patents
Matching method of lithium ion power batteries Download PDFInfo
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- CN111029668A CN111029668A CN201911169045.0A CN201911169045A CN111029668A CN 111029668 A CN111029668 A CN 111029668A CN 201911169045 A CN201911169045 A CN 201911169045A CN 111029668 A CN111029668 A CN 111029668A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- 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
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- Manufacturing & Machinery (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a matching method of lithium ion power batteries, which is carried out according to the following steps: step one, testing the battery capacity; step two, testing voltage drop and internal resistance of the battery; step three, testing the self-discharge rate of the battery; step four, sorting the batteries, and entering step five if the batteries are qualified; step five, sorting the battery capacity; step six, battery series discharge test; step seven, selecting consistency of discharge curves; c, enabling unqualified products to participate in the next lease and enabling qualified products to enter the step eight; and step eight, assembling the battery packs. The invention has the beneficial effects that: the used data is the dynamic and static combination of the batteries, the abnormal batteries can be effectively picked out, the batteries with the consistent indexes are divided into the same battery pack, the consistency of the batteries in the battery pack is ensured, and the service life of the battery pack is prolonged.
Description
Technical Field
The invention relates to a matching method of lithium ion power batteries, and belongs to the technical field of lithium battery detection and sorting.
Background
With the increasing maturity of lithium ion battery technology, and the advantages of large energy density, high safety performance, environmental protection, no pollution and the like, the lithium ion battery technology is widely applied to various fields. Especially, the safety performance is high, so that the use of the automobile safety protection device on the automobile is also common. As an automobile battery pack, a plurality of battery packs are usually combined together, series-parallel connection matching is performed according to voltage capacity required by a customer, the consistency of single batteries in the battery packs determines the overall service life of a battery pack, and in order to ensure the service capacity and the cycle life of the battery packs in the application process, the single batteries forming the battery packs must be sorted and matched, so that parameters such as the capacity, the internal resistance, the charging and discharging platform time and the self-discharge rate tend to be consistent.
The selection method adopted at present is as follows: (1) selecting batteries in a specified capacity range, charging 50% of SOC, standing for 1 day, measuring voltage and internal resistance, and grouping according to the specified voltage and internal resistance range. (2) Firstly selecting batteries in a specified capacity range for monomer charging and discharging, and then sorting the charging and discharging curve platform time according to a specified range
For the automobile battery pack, the method is simple in test mode, only the static battery and the data used by a single battery are detected, the battery with poor consistency cannot be accurately picked out of the battery pack, the consistency of the battery pack is influenced, and the service capacity and the cycle life of the battery pack cannot be normally played by the group matching mode.
Disclosure of Invention
The invention aims to solve the technical problem of providing a matching method of a lithium ion power battery, which carries out matching according to dynamic and static data, solves the problem of single matching mode, ensures the consistency of batteries in a battery pack and improves the matching quality.
The invention is realized by the following scheme: a matching method of lithium ion power batteries is carried out according to the following steps:
step one, testing the battery capacity;
step two, testing voltage drop and internal resistance of the battery;
step three, testing the self-discharge rate of the battery;
step four, sorting the batteries, and entering step five if the batteries are qualified;
step five, sorting the battery capacity;
step six, battery series discharge test;
step seven, selecting consistency of discharge curves; c, enabling unqualified products to participate in the next lease and enabling qualified products to enter the step eight;
and step eight, assembling the battery packs.
A matching method of lithium ion power batteries is carried out according to the following steps:
step one, performing charge and discharge test on a lithium battery;
step two, charging the battery with the finished capacity test, then laying aside, and respectively measuring the voltage difference of the battery in the laying aside stage;
step three, testing the alternating current internal resistance of the battery again;
discharging the shelved battery at the same rate, recording the discharge capacity of the battery, and calculating the self-discharge rate of the battery in the shelved stage;
step five, setting standards for the initial discharge capacity, the first efficiency of the battery, the resting voltage difference value, the alternating current internal resistance and the self-discharge rate, and sorting qualified batteries according to the standards;
setting the capacity, the alternating current internal resistance and the self-discharge rate range standard of the whole battery pack, and connecting the battery pack in series for constant current discharge after selecting batteries in the standard range;
step seven, taking the average value of each discharge voltage value of the batteries to be assembled, calculating the difference value between the average value of the discharge voltage of each battery and the average value of the discharge voltage of all batteries, setting the standard range of the difference values, rejecting the batteries in the standard range of the cut-off voltage, and rejecting the batteries in the standard range of the;
and step eight, eliminating the batteries which do not meet the requirements, selecting the batteries which meet the standards, combining the batteries in series and parallel according to the requirements, and matching the batteries according to the cut-off voltage.
A matching method of lithium ion power batteries is carried out according to the following steps:
firstly, performing charge and discharge tests on a lithium battery according to a certain multiplying power, recording the initial charge capacity and the initial discharge capacity of the battery, and calculating the first efficiency of the battery;
step two, charging the battery with the finished capacity test to 90% -100% SOC, standing for a period of time, and respectively measuring the voltage difference of the battery in the standing stage;
step three, testing the alternating current internal resistance of the battery again;
discharging the shelved battery at the same rate, recording the discharge capacity of the battery, and calculating the self-discharge rate of the battery in the shelved stage;
step five, setting standards for the initial discharge capacity, the first efficiency of the battery, the resting voltage difference value, the alternating current internal resistance and the self-discharge rate, and sorting qualified batteries according to the standards;
setting the capacity, the alternating current internal resistance and the self-discharge rate range standard of the whole battery pack according to the number of batteries in the battery pack required, selecting the batteries in the standard range, charging the batteries to 100% of SOC at constant current, connecting the battery pack in series for constant current discharge, stopping when a single battery reaches a cut-off voltage condition, and recording the discharge cut-off voltage and the voltage of each battery in the discharge process to obtain a battery series discharge voltage distribution curve;
step seven, taking the average value of each discharge voltage value of the batteries to be assembled, calculating the difference value between the average value of the discharge voltage of each battery and the average value of the discharge voltage of all batteries, setting the standard range of the difference values, rejecting the batteries in the standard range of the cut-off voltage, and rejecting the batteries in the standard range of the;
and step eight, eliminating the batteries which do not meet the requirements, selecting the batteries which meet the standards, combining the batteries in series and parallel according to the requirements, and matching the batteries according to the cut-off voltage.
The invention has the beneficial effects that: the used data is the dynamic and static combination of the batteries, the abnormal batteries can be effectively picked out, the batteries with the consistent indexes are divided into the same battery pack, the consistency of the batteries in the battery pack is ensured, and the service life of the battery pack is prolonged.
Drawings
Fig. 1 is a schematic flow chart of a matching method of a lithium ion power battery according to the present invention.
Detailed Description
The invention is further described below with reference to fig. 1, without limiting the scope of the invention.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development effort might be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
A matching method of lithium ion power batteries is carried out according to the following steps:
step one, carrying out charge and discharge tests on a lithium battery according to a certain multiplying power, recording the initial charge capacity Q1 and the initial discharge capacity Q2 of the battery, and calculating the first efficiency of the battery, wherein the formula is η = Q2/Q1 × 100%;
step two, charging each battery in the step one to 100% SOC, standing after the electricity is finished, respectively measuring the voltage of standing time t1 and t2 which are respectively U1 and U2, and calculating the voltage drop delta U value, wherein the formula is as follows: Δ U = U2-U1;
thirdly, the time of t1 is 24 hours, the time of t2 is 240 hours, and after the standing is finished, the alternating current internal resistance R1 of the battery is measured;
step four, discharging the battery finished in the step two at the same multiplying power, recording the discharge capacity Q2 of the battery, and calculating the self-discharge rate of the battery for 10 days and months, wherein the calculation formula is as follows: self-discharge rate = (Q2-Q3)/Q2/t2 × 30;
step five, setting standards for the initial discharge capacity Q2, the first-time efficiency η of the battery, the voltage U2, the voltage drop delta U, the alternating current internal resistance R1, the self-discharge rate and the like, and sorting qualified batteries according to the standards;
and step six, setting the capacity, the alternating current internal resistance and the self-discharge rate range standard of the whole battery pack according to the number of batteries in the battery pack required by a client, selecting the batteries in the standard range, charging the batteries to 100% of SOC at a constant current, connecting the battery pack in series for constant current discharge, stopping when a single battery reaches a cut-off voltage condition, and recording the cut-off voltage. Setting voltage recording time to be 15S, and recording the voltage of each battery in the discharging process to obtain a battery series discharging voltage distribution curve;
selecting each discharging platform of the batteries to be assembled in the sixth step, taking an average value U0, calculating a difference value between Un and U0 of each battery, setting a standard range of the difference values, rejecting the batteries in the standard range of the cut-off voltage, and rejecting the batteries in the standard range of the range;
and step eight, combining the batteries selected in the step seven in series and parallel according to the requirements of customers, and matching according to cut-off voltage.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (3)
1. A matching method of lithium ion power batteries is characterized in that: the method comprises the following steps:
step one, testing the battery capacity;
step two, testing voltage drop and internal resistance of the battery;
step three, testing the self-discharge rate of the battery;
step four, sorting the batteries, and entering step five if the batteries are qualified;
step five, sorting the battery capacity;
step six, battery series discharge test;
step seven, selecting consistency of discharge curves; c, enabling unqualified products to participate in the next lease and enabling qualified products to enter the step eight;
and step eight, assembling the battery packs.
2. The matching method of the lithium ion power battery according to claim 1, characterized in that: the method comprises the following steps:
step one, performing charge and discharge test on a lithium battery;
step two, charging the battery with the finished capacity test, then laying aside, and respectively measuring the voltage difference of the battery in the laying aside stage;
step three, testing the alternating current internal resistance of the battery again;
discharging the shelved battery at the same rate, recording the discharge capacity of the battery, and calculating the self-discharge rate of the battery in the shelved stage;
step five, setting standards for the initial discharge capacity, the first efficiency of the battery, the resting voltage difference value, the alternating current internal resistance and the self-discharge rate, and sorting qualified batteries according to the standards;
setting the capacity, the alternating current internal resistance and the self-discharge rate range standard of the whole battery pack, and connecting the battery pack in series for constant current discharge after selecting batteries in the standard range;
step seven, taking the average value of each discharge voltage value of the batteries to be assembled, calculating the difference value between the average value of the discharge voltage of each battery and the average value of the discharge voltage of all batteries, setting the standard range of the difference values, rejecting the batteries in the standard range of the cut-off voltage, and rejecting the batteries in the standard range of the;
and step eight, eliminating the batteries which do not meet the requirements, selecting the batteries which meet the standards, combining the batteries in series and parallel according to the requirements, and matching the batteries according to the cut-off voltage.
3. The matching method of the lithium ion power battery according to claim 1, characterized in that: the method comprises the following steps:
firstly, performing charge and discharge tests on a lithium battery according to a certain multiplying power, recording the initial charge capacity and the initial discharge capacity of the battery, and calculating the first efficiency of the battery;
step two, charging the battery with the finished capacity test to 90% -100% SOC, standing for a period of time, and respectively measuring the voltage difference of the battery in the standing stage;
step three, testing the alternating current internal resistance of the battery again;
discharging the shelved battery at the same rate, recording the discharge capacity of the battery, and calculating the self-discharge rate of the battery in the shelved stage;
step five, setting standards for the initial discharge capacity, the first efficiency of the battery, the resting voltage difference value, the alternating current internal resistance and the self-discharge rate, and sorting qualified batteries according to the standards;
setting the capacity, the alternating current internal resistance and the self-discharge rate range standard of the whole battery pack according to the number of batteries in the battery pack required, selecting the batteries in the standard range, charging the batteries to 100% of SOC at constant current, connecting the battery pack in series for constant current discharge, stopping when a single battery reaches a cut-off voltage condition, and recording the discharge cut-off voltage and the voltage of each battery in the discharge process to obtain a battery series discharge voltage distribution curve;
step seven, taking the average value of each discharge voltage value of the batteries to be assembled, calculating the difference value between the average value of the discharge voltage of each battery and the average value of the discharge voltage of all batteries, setting the standard range of the difference values, rejecting the batteries in the standard range of the cut-off voltage, and rejecting the batteries in the standard range of the;
and step eight, eliminating the batteries which do not meet the requirements, selecting the batteries which meet the standards, combining the batteries in series and parallel according to the requirements, and matching the batteries according to the cut-off voltage.
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Cited By (6)
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| CN112114266A (en) * | 2020-09-21 | 2020-12-22 | 郑州中科新兴产业技术研究院 | Method for realizing battery screening and grouping in one step |
| CN112246691A (en) * | 2020-09-24 | 2021-01-22 | 天津普兰能源科技有限公司 | Li (M)1-xFex）PO4/Li4Ti5O12High-capacity battery selection method |
| CN113275271A (en) * | 2021-05-18 | 2021-08-20 | 上海电气国轩新能源科技有限公司 | Sorting method of lithium battery |
| CN114122545A (en) * | 2021-11-05 | 2022-03-01 | 格力钛新能源股份有限公司 | Lithium battery matching method |
| CN114951042A (en) * | 2022-05-12 | 2022-08-30 | 华富(江苏)锂电新技术有限公司 | Screening method for improving uniformity of echelon batteries |
| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114266A (en) * | 2020-09-21 | 2020-12-22 | 郑州中科新兴产业技术研究院 | Method for realizing battery screening and grouping in one step |
| CN112246691A (en) * | 2020-09-24 | 2021-01-22 | 天津普兰能源科技有限公司 | Li (M)1-xFex）PO4/Li4Ti5O12High-capacity battery selection method |
| CN112246691B (en) * | 2020-09-24 | 2022-05-31 | 天津普兰能源科技有限公司 | Method for selecting Li (M1-xFex) PO4/Li4Ti5O12 high-capacity battery |
| CN113275271A (en) * | 2021-05-18 | 2021-08-20 | 上海电气国轩新能源科技有限公司 | Sorting method of lithium battery |
| CN114122545A (en) * | 2021-11-05 | 2022-03-01 | 格力钛新能源股份有限公司 | Lithium battery matching method |
| CN114951042A (en) * | 2022-05-12 | 2022-08-30 | 华富(江苏)锂电新技术有限公司 | Screening method for improving uniformity of echelon batteries |
| CN114951042B (en) * | 2022-05-12 | 2024-05-24 | 华富(江苏)锂电新技术有限公司 | Screening method for improving consistency of echelon batteries |
| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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Application publication date: 20200417 |