CN112666471A - Lithium ion battery consistency sorting method and sorting system - Google Patents
Lithium ion battery consistency sorting method and sorting system Download PDFInfo
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- CN112666471A CN112666471A CN202011580099.9A CN202011580099A CN112666471A CN 112666471 A CN112666471 A CN 112666471A CN 202011580099 A CN202011580099 A CN 202011580099A CN 112666471 A CN112666471 A CN 112666471A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 58
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 238000012216 screening Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
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Abstract
A lithium ion battery consistency sorting method comprises the following steps: carrying out battery capacity test and battery energy test on each lithium ion battery to be grouped under a preset voltage value and a preset charging and discharging current value; adjusting the state of charge of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value; storing the adjusted lithium ion battery in a preset environment for a preset time; collecting the internal resistance and voltage of each lithium ion battery after storage; and grouping the lithium ion batteries according to a preset grouping mode, the tested battery capacity, the tested battery energy, the collected voltage and the internal resistance, wherein the preset grouping mode shows the discharging capacity, the discharging energy, the internal resistance and the voltage group in different ranges. The invention also provides a lithium ion battery consistency sorting system.
Description
Technical Field
The invention relates to lithium ion batteries, in particular to a lithium ion battery consistency sorting method and a lithium ion battery consistency sorting system.
Background
At present, the lithium ion battery has the characteristics of high energy density, long cycle life, environmental friendliness and the like, and is widely popular in the fields of 3C, electric automobiles, large-scale energy storage, backup power supplies and the like. Due to the performance limitation of lithium battery materials, when lithium batteries are used in the above fields, the monomers need to be connected in series and parallel to be used in groups. When the batteries are used in groups, the capacity, voltage, internal resistance, service life and other performances of the battery pack are limited by the barrel effect and closely related to the batteries with poor performance in the battery pack, and the improvement of the consistency of the battery performance in the battery pack is of great importance in order to improve the performance of the battery pack.
The existing lithium ion battery consistency sorting method mainly tests and screens the factors such as the capacity, the internal resistance, the self-discharge, the direct current internal resistance and the like of the battery for multiple times, although the method can improve the consistency of the battery pack, the sorting factors and the testing times are multiple, the flow is complex, and the method is not beneficial to the large-scale sorting of the battery.
Disclosure of Invention
In view of the above, it is necessary to provide a method and a system for sorting lithium ion batteries in a consistent manner, so as to facilitate the large-scale sorting of the batteries.
A lithium ion battery consistency sorting method comprises the following steps:
carrying out battery capacity test and battery energy test on each lithium ion battery to be grouped under a preset voltage value and a preset charging and discharging current value;
adjusting the state of charge of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value;
storing the adjusted lithium ion battery in a preset environment for a preset time;
collecting the internal resistance and voltage of each lithium ion battery after storage; and
grouping the lithium ion batteries according to a preset grouping mode, tested battery capacity, tested battery energy, collected voltage and internal resistance, wherein the preset grouping mode indicates the groups of the discharge capacity, the discharge energy, the internal resistance and the voltage in different ranges.
Further, the preset voltage value and the preset charging and discharging current value are determined according to a preset rule and a preset using environment, wherein the preset rule comprises the preset voltage value and the preset charging and discharging current value of a battery to be equipped in the preset using environment.
Further, the predetermined use environment includes a use voltage and a use temperature of the battery.
Furthermore, the preset voltage value is between 2.0V and 3.65V, the charge and discharge current value is expressed by charge and discharge multiplying power, and the charge and discharge multiplying power corresponding to the charge and discharge current value is between 0.05C and 1.5C.
Further, the preset value is 1% -8%.
A lithium ion battery uniformity sorting system comprising:
the device comprises a storage unit, a control unit and a control unit, wherein the storage unit is used for storing preset grouping modes, and the preset grouping modes indicate groups of discharge capacities, discharge energies, internal resistances and voltages in different ranges;
the capacity energy testing unit is used for testing the battery capacity and the battery energy of each lithium ion battery to be grouped under the preset voltage value and the preset charging and discharging current value;
the adjusting unit is used for adjusting the charge state of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value;
the voltage internal resistance testing unit is used for acquiring the internal resistance and the voltage of the lithium ion battery after the adjusted lithium ion battery is stored for a preset time; and
and the grouping unit is used for grouping the lithium ion batteries according to the preset grouping mode, the tested battery capacity, the tested battery energy, the acquired voltage and the internal resistance.
The battery charging and discharging device further comprises a determining unit, wherein the storage unit is further used for storing preset rules, the preset rules comprise preset voltage values and preset charging and discharging current values of batteries to be equipped in a preset using environment, and the determining unit is used for determining the preset voltage values and the preset charging and discharging current values according to the preset rules.
Further, the determining unit, the storing unit and the grouping unit are disposed in the same electronic device.
Furthermore, the adjusting unit and the capacity and energy testing unit are a charging and discharging module and a capacity and energy testing module on a battery charging and discharging testing cabinet.
Further, the voltage internal resistance testing unit is a voltage internal resistance tester.
According to the lithium ion battery consistency sorting method and the lithium ion battery consistency sorting system, the consistency sorting is performed on each lithium ion battery through the battery capacity, the battery energy, the internal resistance and the voltage of the stored lithium ion battery, in the sorting process, the sorting factor and the test frequency are few, the flow is simple, and the large-scale sorting of the batteries is facilitated.
Drawings
Fig. 1 is a flow chart of a lithium ion battery consistency sorting method.
Fig. 2 is a schematic diagram of a lithium ion battery uniformity sorting system.
Description of the main elements
| Lithium ion battery consistency sorting method | Steps S11-S16 |
| Lithium ion battery |
20 |
| |
21 |
| Determining |
22 |
| |
23 |
| Adjusting |
24 |
| Voltage internal |
25 |
| |
26 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of a lithium ion battery consistency sorting method provided by the present invention is shown, where the lithium ion battery consistency sorting method is used for screening and grouping lithium ion batteries, and includes the following steps:
step S11: and determining a preset voltage value and a preset charging and discharging current value according to a preset rule and a preset use environment, wherein the preset rule comprises the preset voltage value and the preset charging and discharging current value of the battery to be equipped in the preset use environment. The predetermined use environment is an environment in which the battery is to be used, and corresponds to an actual demand. In one embodiment, the predetermined usage environment includes a usage voltage and a usage temperature of the battery. The preset voltage value is the voltage adopted when the battery is tested, and the preset charging and discharging current value is the charging and discharging current used when the battery is tested. In one embodiment, the predetermined voltage value is between 2.0V and 3.65V, the charge and discharge current value is expressed by a charge and discharge rate, and the charge and discharge rate corresponding to the charge and discharge current value is between 0.05C and 1.5C.
Step S12: and carrying out battery capacity test and battery energy test on each lithium ion battery to be grouped under the preset voltage value and the preset charging and discharging current value so as to obtain the battery capacity and the battery energy. In one embodiment, the battery capacity test and the battery energy test are performed on the lithium ion batteries to be grouped through the battery charging and discharging test cabinet.
Step S13: and adjusting the state of charge (SOC) of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value. In one embodiment, the predetermined value of SOC is 1% to 8%. In one embodiment, the state of charge of the lithium ion battery is adjusted to a preset value by the battery charge and discharge test cabinet.
Step S14: and storing the adjusted lithium ion battery in a preset environment for a preset time. In one embodiment, the predetermined time period is 3-60 days, as determined by the delivery cycle. The preset environment comprises a storage temperature, and the storage temperature ranges from 20 ℃ to 55 ℃.
Step S15: and collecting the stored internal resistance and voltage of each lithium ion battery. In one embodiment, the internal resistance and voltage of the lithium ions are collected by a voltage internal resistance tester.
Step S16: grouping the lithium ion batteries according to a preset grouping mode, tested battery capacity, tested battery energy, collected voltage and internal resistance, wherein the preset grouping mode indicates the groups of the discharge capacity, the discharge energy, the internal resistance and the voltage in different ranges. The lithium ion batteries classified into the same group have consistent performance, so that consistency screening of the lithium ion batteries is realized.
Referring to fig. 2, the present invention further provides a lithium ion battery consistency sorting system 20, configured to execute the lithium ion battery consistency sorting method described above. The lithium ion battery consistency sorting system comprises a storage unit 21, a determining unit 22, a capacity energy testing unit 23, an adjusting unit 24, a voltage internal resistance testing unit 25 and a grouping unit 26.
The storage unit 21 is configured to store a preset rule and a preset grouping manner. The preset rule comprises a preset voltage value and a preset charging and discharging current value of a battery to be equipped in a preset use environment. The predetermined use environment is an environment in which the battery is to be used, and corresponds to an actual demand. In one embodiment, the predetermined usage environment includes a usage voltage and a usage temperature of the battery. The preset voltage value is the voltage adopted when the battery is tested, and the preset charging and discharging current value is the charging and discharging current used when the battery is tested. In one embodiment, the predetermined voltage value is between 2.0V and 3.65V, the charge and discharge current value is expressed by a charge and discharge rate, and the charge and discharge rate corresponding to the charge and discharge current value is between 0.05C and 1.5C. The preset grouping mode indicates different ranges of discharge capacity, discharge energy, internal resistance and voltage groups.
The determining unit 22 is configured to determine a predetermined voltage value and a predetermined charging/discharging current value according to the preset rule. The determination unit 22 is provided in the same electronic device as the storage unit 21.
The capacity and energy testing unit 23 is configured to perform a battery capacity test and a battery energy test on each lithium ion battery to be grouped under the predetermined voltage value and the predetermined charging and discharging current value to obtain a battery capacity and a battery energy. In one embodiment, the energy capacity testing unit 23 is a battery charging and discharging testing cabinet.
The adjusting unit 24 is configured to adjust a state of charge soc (state of charge) of the lithium ion battery that has undergone the battery capacity test and the battery energy test to a preset value. In one embodiment, the predetermined value of SOC is 1% to 8%. In one embodiment, the adjusting unit 24 and the capacity and energy testing unit 23 are a charging and discharging module and a capacity and energy testing module on a battery charging and discharging testing cabinet.
The voltage internal resistance test unit 25 is used for acquiring the internal resistance and the voltage of the lithium ion battery after the adjusted lithium ion battery is stored for a preset time. In one embodiment, the voltage internal resistance testing unit 25 is a voltage internal resistance tester.
The grouping unit 26 is configured to group the lithium ion batteries according to the preset grouping manner, the tested battery capacity, the tested battery energy, the acquired voltage, and the internal resistance. The lithium ion batteries classified into the same group have consistent performance, so that consistency screening of the lithium ion batteries is realized. In one embodiment, the grouping unit 26 is disposed in the same electronic device as the determining unit 22 and the storing unit 21.
The lithium ion battery consistency sorting method and the lithium ion battery consistency sorting system 20 perform consistency screening on each lithium ion battery through the battery capacity, the battery energy, and the internal resistance and the voltage of the stored lithium ion battery, and in the screening process, the sorting factor and the test frequency are few, the flow is simple, and the large-scale sorting of the batteries is facilitated.
It will be appreciated by those skilled in the art that the above embodiments are illustrative only and not intended to be limiting, and that suitable modifications and variations to the above embodiments are within the scope of the disclosure provided that the invention is not limited thereto.
Claims (10)
1. A lithium ion battery consistency sorting method comprises the following steps:
carrying out battery capacity test and battery energy test on each lithium ion battery to be grouped under a preset voltage value and a preset charging and discharging current value;
adjusting the state of charge of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value;
storing the adjusted lithium ion battery in a preset environment for a preset time;
collecting the internal resistance and voltage of each lithium ion battery after storage; and
grouping the lithium ion batteries according to a preset grouping mode, tested battery capacity, tested battery energy, collected voltage and internal resistance, wherein the preset grouping mode indicates the groups of the discharge capacity, the discharge energy, the internal resistance and the voltage in different ranges.
2. The method of claim 1, wherein the step of uniformly sorting the lithium ion batteries,
and determining the preset voltage value and the preset charging and discharging current value according to a preset rule and a preset use environment, wherein the preset rule comprises the preset voltage value and the preset charging and discharging current value of the battery to be equipped in the preset use environment.
3. The method according to claim 2, wherein the predetermined usage environment comprises a usage voltage and a usage temperature of the battery.
4. The lithium ion battery consistency sorting method according to claim 1, wherein the predetermined voltage value is between 2.0V and 3.65V, the charge and discharge current value is expressed by a charge and discharge rate, and the charge and discharge rate corresponding to the charge and discharge current value is between 0.05C and 1.5C.
5. The method for consistently sorting lithium ion batteries according to claim 1, wherein the preset value is 1% to 8%.
6. A lithium ion battery uniformity sorting system comprising:
the device comprises a storage unit, a control unit and a control unit, wherein the storage unit is used for storing preset grouping modes, and the preset grouping modes indicate groups of discharge capacities, discharge energies, internal resistances and voltages in different ranges;
the capacity energy testing unit is used for testing the battery capacity and the battery energy of each lithium ion battery to be grouped under the preset voltage value and the preset charging and discharging current value;
the adjusting unit is used for adjusting the charge state of the lithium ion battery subjected to the battery capacity test and the battery energy test to a preset value;
the voltage internal resistance testing unit is used for acquiring the internal resistance and the voltage of the lithium ion battery after the adjusted lithium ion battery is stored for a preset time; and
and the grouping unit is used for grouping the lithium ion batteries according to the preset grouping mode, the tested battery capacity, the tested battery energy, the acquired voltage and the internal resistance.
7. The system according to claim 6, further comprising a determining unit, wherein the storing unit is further configured to store a preset rule, the preset rule includes a preset voltage value and a preset charging/discharging current value of the battery to be equipped in a preset usage environment, and the determining unit is configured to determine the preset voltage value and the preset charging/discharging current value according to the preset rule.
8. The lithium ion battery uniformity sorting system of claim 7, wherein the determining unit, the storing unit, and the grouping unit are disposed in the same electronic device.
9. The system of claim 6, wherein the adjusting unit and the capacity and energy testing unit are a charge-discharge module and a capacity and energy testing module on a battery charge-discharge testing cabinet.
10. The lithium ion battery uniformity sorting system of claim 6, wherein the voltage internal resistance test unit is a voltage internal resistance tester.
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| CN202011580099.9A CN112666471A (en) | 2020-12-28 | 2020-12-28 | Lithium ion battery consistency sorting method and sorting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577687A (en) * | 2023-07-14 | 2023-08-11 | 南昌航空大学 | Cell screening method and system for quick-charging battery pack, storage medium and computer |
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| CN110501649A (en) * | 2019-07-26 | 2019-11-26 | 苏州安靠电源有限公司 | A kind of lithium battery Conformance Assessment test method |
| CN111036575A (en) * | 2019-12-05 | 2020-04-21 | 国电南瑞科技股份有限公司 | Lithium ion battery sorting method based on temperature change analysis |
| CN111740176A (en) * | 2020-07-02 | 2020-10-02 | 南京工程学院 | A sorting method for retired power lithium batteries |
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2020
- 2020-12-28 CN CN202011580099.9A patent/CN112666471A/en active Pending
Patent Citations (4)
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| CN107983667A (en) * | 2017-11-23 | 2018-05-04 | 中国东方电气集团有限公司 | A kind of lithium ion battery grouping method |
| CN110501649A (en) * | 2019-07-26 | 2019-11-26 | 苏州安靠电源有限公司 | A kind of lithium battery Conformance Assessment test method |
| CN111036575A (en) * | 2019-12-05 | 2020-04-21 | 国电南瑞科技股份有限公司 | Lithium ion battery sorting method based on temperature change analysis |
| CN111740176A (en) * | 2020-07-02 | 2020-10-02 | 南京工程学院 | A sorting method for retired power lithium batteries |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116577687A (en) * | 2023-07-14 | 2023-08-11 | 南昌航空大学 | Cell screening method and system for quick-charging battery pack, storage medium and computer |
| CN116577687B (en) * | 2023-07-14 | 2024-04-19 | 南昌航空大学 | Method, system, storage medium and computer for selecting cells of fast-charging battery pack |
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