CN111001588A - Battery pack echelon recycling method - Google Patents
Battery pack echelon recycling method Download PDFInfo
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- CN111001588A CN111001588A CN201911057878.8A CN201911057878A CN111001588A CN 111001588 A CN111001588 A CN 111001588A CN 201911057878 A CN201911057878 A CN 201911057878A CN 111001588 A CN111001588 A CN 111001588A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004064 recycling Methods 0.000 title claims abstract description 23
- 230000032683 aging Effects 0.000 claims abstract description 24
- 238000010278 pulse charging Methods 0.000 claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 17
- 238000007600 charging Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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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- 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
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Manufacturing & Machinery (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery pack echelon recycling method, which comprises the following steps: step S1, setting a communication port of the battery pack; step S2, rejecting abnormal battery modules in each battery pack according to the magnitude of the discharge pressure difference; step S3, dividing the normal battery module into several different capacity grades according to the capacity; step S4, disassembling the battery pack into battery modules; step S5, aging the disassembled battery module, and dividing the battery module into a plurality of different self-discharge grades according to the self-discharge voltage drop value; step S6, the aged battery modules are subjected to pulse charging, and the battery modules are divided into a plurality of different pulse grades according to the magnitude of the terminal voltage; and step S7, matching the battery modules according to the capacity grade, the self-discharge voltage drop grade and the pulse grade. The invention has the beneficial effects that: the battery pack only needs to be disassembled into the battery modules, the disassembling process is simple, and large-scale production is facilitated.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a battery pack echelon recycling method.
[ background of the invention ]
The lithium ion battery has the characteristics of large capacity and environmental protection, and is widely applied to various aspects of medical treatment, communication, traffic and the like, especially the vigorous promotion of environmental traffic, the development of electric vehicles is faster and faster, along with the increasing number of retired battery packs on the electric vehicles, the capacity of the battery packs is uneven, and the battery packs can be reused after being tested and classified. In prior art, test, stepping after dismantling into battery cell with the group battery usually, however the quantity of battery cell in the group battery is numerous, and it is longer to disassemble the time, and the group battery welds dead with battery cell's utmost point post usually in order to guarantee the reliability of electric connection when being in groups, has so increased battery cell's the degree of difficulty of disassembling more, has greatly increased the reutilization cost of decommissioning group battery.
In view of the above, it is desirable to provide a method for recycling battery pack in a cascade manner to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide a battery pack echelon recycling method, which aims to reduce the disassembling difficulty of a decommissioned battery pack and improve the recycling effect of the decommissioned battery pack by disassembling the decommissioned battery pack into battery modules for matching.
In order to achieve the above object, the present invention provides a battery pack echelon recycling method, comprising the steps of: step S1, setting a communication port of the recovered battery pack for connecting a corresponding battery management system; step S2, discharge pressure difference detection is carried out on the battery packs, and abnormal battery modules in each battery pack are removed according to the discharge pressure difference; step S3, carrying out capacity detection on the battery pack with the abnormal battery modules removed, and dividing the normal battery modules in the battery pack into a plurality of different capacity grades according to the capacity; step S4, disassembling the battery pack into battery modules, and filing the battery modules according to the structure and the capacity grade of the battery modules; step S5, aging the disassembled battery module, detecting the self-discharge voltage drop value before and after aging of the battery module, and dividing the battery module into a plurality of different self-discharge grades according to the size of the self-discharge voltage drop value; step S6, the aged battery module is pulse charged, the end voltage of the battery module after pulse charging is detected, and the battery module is divided into a plurality of different pulse grades according to the size of the end voltage; and step S7, battery module matching, wherein the battery module is matched according to the capacity grade, the self-discharge voltage drop grade and the pulse grade.
In a preferred embodiment, the step S2 includes the steps of: step S201, performing a cycle charge and discharge test on the battery pack; step S202, detecting whether the discharge differential pressure of the battery pack is smaller than a first discharge differential pressure threshold, if so, entering step S3, and if so, entering step S203; step S203, screening out the battery modules with the discharging pressure difference larger than the second discharging pressure difference threshold value through the battery management system, short-circuiting the battery modules, and returning to the step S201.
In a preferred embodiment, the first threshold value of the differential pressure of the discharge is 200mv, and the second threshold value of the differential pressure of the discharge is 300 mv.
In a preferred embodiment, the step S2 includes the steps of: step S301, performing a cyclic charge and discharge test on the battery pack, and performing equalization processing on the battery pack through a battery management system to keep the voltage of each single battery consistent; step S302, performing a certain number of cyclic charge and discharge tests on the battery pack, and acquiring the capacity data of each battery module through a battery management system; step S303, dividing the battery module into a plurality of different capacity grades according to the capacity data.
In a preferred embodiment, battery modules with capacity differences between 0% and 2% are used for matching.
In a preferred embodiment, the one-cycle charge-discharge test comprises the steps of: firstly, fully charging the battery pack according to the charging current of 0.5C, then standing the fully charged battery pack for 20min, then discharging the fully charged battery pack according to the discharging current of 0.5C, and finally standing the discharged battery pack for 20 min.
In a preferred embodiment, during the cyclic charge and discharge test, the battery pack to be tested sets the highest charge voltage threshold and the lowest discharge voltage threshold of the single battery through the battery management system.
In a preferred embodiment, the step S5 includes the steps of: step S501, measuring a voltage value of the battery module before aging; step S502, carrying out high-temperature aging on the battery module, wherein the aging temperature is 45 ℃, and the aging time is 48 h; step S503, after the aged battery module is kept stand for 24 hours, measuring the voltage value of the battery module; in step S504, the self-discharge voltage drop value of the battery module is calculated.
In a preferred embodiment, the self-discharge voltage drop value is calculated by the formula Δ V ═ V1-V2/t, Δ V is the self-discharge voltage drop value, V1 is the voltage value before the battery module is aged, V2 is the voltage value after the battery module is aged, t is the aging time of the battery module, and Δ V is between 0% and 6% for matching.
In a preferred embodiment, in the step S6, the current magnitude of the pulse charging is 2C, the time of the pulse charging is 5S, and the battery module with the end voltage difference value between 100 and 300mv is used for matching.
The invention gradually and hierarchically archives the battery modules in the recovered battery pack through capacity detection, self-discharge voltage drop detection and pulse charging detection, so that the recovered battery pack can be well utilized in a gradient manner, and meanwhile, the recovered battery pack only needs to be disassembled into the battery modules, so that the disassembly process is simple and is beneficial to large-scale production.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
FIG. 1 is a flow chart of a battery pack echelon recycling method provided by the present invention;
FIG. 2 is a flowchart of step S2 shown in FIG. 1;
FIG. 3 is a flowchart of step S3 shown in FIG. 1;
fig. 4 is a flowchart of step S5 shown in fig. 1.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, the present invention provides a method for recycling battery pack echelons, which is used to recycle battery packs to better improve the secondary utilization rate of the battery packs.
In the embodiment of the invention, the battery pack echelon recycling method comprises the following steps:
step S1, the communication port of the battery pack is set for connecting to a corresponding battery management system, so as to facilitate detection of the battery pack in subsequent steps.
Step S2, detecting the discharge pressure difference of the battery packs, and removing abnormal battery modules in each battery pack according to the magnitude of the discharge pressure difference, specifically including the following steps:
step S201, performing a cycle charge and discharge test on the battery pack, in this embodiment, the cycle charge and discharge test includes the following steps: firstly, fully charging the battery pack according to the charging current of 0.5C, then standing the fully charged battery pack for 20min, then discharging the electric quantity of the fully charged battery pack according to the discharging current of 0.5C, and finally standing the discharged battery pack for 20min to complete a cycle charging and discharging test, so as to ensure the accuracy of detection data, and simultaneously, in the process of the cycle charging and discharging test, the battery pack to be tested sets the highest charging voltage threshold and the lowest discharging voltage threshold of a single battery through a battery management system so as to avoid the bad phenomenon of over-charging or over-discharging of the single battery, and the highest charging voltage threshold and the lowest discharging voltage threshold need to correspond to the type of the single battery, for example, the highest charging voltage threshold and the lowest discharging voltage threshold of the lithium iron phosphate battery can be respectively set to 3.60V and 2.75V, and the highest charging voltage threshold and the lowest discharging voltage threshold of the lithium ternary battery can be respectively set to 4.15V and 3.00V, the concrete conditions are determined according to actual conditions, and the method is not limited herein;
step S202, detecting whether the discharge pressure difference of the battery pack is smaller than a first discharge pressure difference threshold, if the discharge pressure difference is smaller than the first discharge pressure difference threshold, step S3 is performed, and if the discharge pressure difference is larger than the first discharge pressure difference threshold, step S203 is performed, it can be understood that if the discharge pressure difference of the battery pack is smaller than the first discharge pressure difference threshold, it indicates that the consistency of each battery module in the battery pack is in a better state, and the battery pack can be used in a stepped manner, and if the discharge pressure difference of the battery pack is larger than the first discharge pressure difference threshold, it indicates that an abnormal battery module exists in the battery pack, that is, the performance of the abnormal battery module has a larger difference compared with other battery modules, so. In the present embodiment, the first discharge differential pressure threshold is 200 mv;
step S203, screening out the battery modules with the discharge pressure difference larger than the second discharge pressure difference threshold value through the battery management system, carrying out short circuit on the battery modules, and returning to the step S201, wherein the abnormal battery modules are the battery modules with the discharge pressure difference larger than the second discharge pressure difference threshold value, and can be removed from the battery pack in a short circuit mode. In the present embodiment, the second discharge differential pressure threshold is 300 mv.
Step S3, performing capacity detection on the battery pack from which the abnormal battery modules are removed, and dividing the normal battery modules in the battery pack into a plurality of different capacity grades according to the capacity, specifically including the following steps:
step S301, performing a cycle charge and discharge test on the battery pack according to the cycle charge and discharge test process of the step S201, and performing equalization processing on the battery pack through a battery management system to keep the voltage of each single battery consistent, so that the accuracy of capacity data can be ensured in the following capacity test;
step S302, performing a certain number of cyclic charge and discharge tests on the battery pack according to the cyclic charge and discharge test process of the step S201, and acquiring the capacity data of each battery module through a battery management system;
and step S303, dividing the battery modules into a plurality of different capacity grades according to the capacity data, and matching the battery modules with the capacity difference between 0% and 2%.
Step S4, disassembling the battery pack into battery modules, and filing the battery modules according to the structure and capacity grade of the battery modules, that is, classifying the battery modules having the same structure and the same capacity grade into the same grade, it should be noted that the rejected abnormal battery modules are not reused in echelon after being disassembled, and need to be stored additionally to avoid confusion. It can be understood that the battery pack does not need to be disassembled into single batteries, the disassembling process is effectively simplified, the disassembling time is effectively shortened, and the disassembling cost is reduced.
Step S5, aging the disassembled battery module, detecting a self-discharge voltage drop value before and after aging of the battery module, and dividing the battery module into a plurality of different self-discharge levels according to the self-discharge voltage drop value, specifically including the following steps:
step S501, measuring a voltage value of the battery module before aging;
step S502, carrying out high-temperature aging on the battery module, wherein the aging temperature is 45 ℃, and the aging time is 48 h;
step S503, after the aged battery module is kept stand for 24 hours, measuring the voltage value of the battery module;
step S504, calculating a self-discharge voltage drop value of the battery module, where Δ V is equal to V1-V2/t, Δ V is the self-discharge voltage drop value, V1 is the voltage value of the battery module before aging, V2 is the voltage value of the battery module after aging, t is the aging time of the battery module, and Δ V is between 0% and 6% for matching gears.
And step S6, carrying out pulse charging on the aged battery module, detecting the end voltage of the battery module after pulse charging, and dividing the battery module into a plurality of different pulse grades according to the size of the end voltage. The polarization reaction of the battery modules can be effectively eliminated through a pulse charging test, the service life and the charging capacity of the battery modules can be improved, and meanwhile, the charging performance difference among the battery modules can also be judged through the terminal voltage, in the embodiment, the current of pulse charging is 2C, the pulse charging time is 5S, and the battery modules with the terminal voltage difference value of 100 plus 300mv are divided into a plurality of different pulse grades to be matched for use.
And step S7, battery module matching, wherein the battery module is matched according to the capacity grade, the self-discharge voltage drop grade and the pulse grade.
The following table shows the discharged static voltage values of the battery modules of the two battery packs reconfigured according to the method.
It can be seen from the above table that after the recovered battery pack is re-configured by the battery pack echelon recycling method, the static pressure difference of the battery module in the new battery pack is within 60mv, and the purpose of performing echelon utilization on the recovered battery pack can be achieved.
In summary, the battery pack echelon recycling method provided by the invention gradually files the battery modules in the recycled battery pack in a graded manner through capacity detection, self-discharge voltage drop detection and pulse charge detection, so that the recycled battery pack can be well utilized in a graded manner, and meanwhile, the recycled battery pack only needs to be disassembled into the battery modules, so that the disassembling process is simple and is beneficial to large-scale production.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. The battery pack echelon recycling method is characterized by comprising the following steps of: step S1, setting a communication port of the recovered battery pack for connecting a corresponding battery management system; step S2, discharge pressure difference detection is carried out on the battery packs, and abnormal battery modules in each battery pack are removed according to the discharge pressure difference; step S3, carrying out capacity detection on the battery pack with the abnormal battery modules removed, and dividing the normal battery modules in the battery pack into a plurality of different capacity grades according to the capacity; step S4, disassembling the battery pack into battery modules, and filing the battery modules according to the structure and the capacity grade of the battery modules; step S5, aging the disassembled battery module, detecting the self-discharge voltage drop value before and after aging of the battery module, and dividing the battery module into a plurality of different self-discharge grades according to the size of the self-discharge voltage drop value; step S6, the aged battery module is pulse charged, the end voltage of the battery module after pulse charging is detected, and the battery module is divided into a plurality of different pulse grades according to the size of the end voltage; and step S7, battery module matching, wherein the battery module is matched according to the capacity grade, the self-discharge voltage drop grade and the pulse grade.
2. The battery bank echelon recycling method of claim 1, wherein the step S2 includes the steps of: step S201, performing a cycle charge and discharge test on the battery pack; step S202, detecting whether the discharge differential pressure of the battery pack is smaller than a first discharge differential pressure threshold, if so, entering step S3, and if so, entering step S203; step S203, screening out the battery modules with the discharging pressure difference larger than the second discharging pressure difference threshold value through the battery management system, short-circuiting the battery modules, and returning to the step S201.
3. The battery bank echelon recycling method of claim 2, wherein the first discharge pressure differential threshold is 200mv and the second discharge pressure differential threshold is 300 mv.
4. The battery bank echelon recycling method of claim 1, wherein the step S2 includes the steps of: step S301, performing a cyclic charge and discharge test on the battery pack, and performing equalization processing on the battery pack through a battery management system to keep the voltage of each single battery consistent; step S302, performing a certain number of cyclic charge and discharge tests on the battery pack, and acquiring the capacity data of each battery module through a battery management system; step S303, dividing the battery module into a plurality of different capacity grades according to the capacity data.
5. The battery pack echelon recycling method as claimed in claim 4, wherein battery modules with capacity difference between 0% and 2% are used in matching with gears.
6. The battery pack echelon recycling method according to claim 2 or 4, characterized in that a one-cycle charge and discharge test comprises the following steps: firstly, fully charging the battery pack according to the charging current of 0.5C, then standing the fully charged battery pack for 20min, then discharging the fully charged battery pack according to the discharging current of 0.5C, and finally standing the discharged battery pack for 20 min.
7. The method for recycling battery pack echelons as recited in claim 6, wherein in the process of cyclic charge and discharge testing, the battery pack to be tested sets the highest charge voltage threshold and the lowest discharge voltage threshold of the single batteries through a battery management system.
8. The battery bank echelon recycling method of claim 1, wherein the step S5 includes the steps of: step S501, measuring a voltage value of the battery module before aging; step S502, carrying out high-temperature aging on the battery module, wherein the aging temperature is 45 ℃, and the aging time is 48 h; step S503, after the aged battery module is kept stand for 24 hours, measuring the voltage value of the battery module; in step S504, the self-discharge voltage drop value of the battery module is calculated.
9. The battery pack echelon recycling method according to claim 8, wherein the self-discharge voltage drop value is calculated as Δ V ═ V1-V2/t, Δ V is the self-discharge voltage drop value, V1 is the voltage value before the battery module is aged, V2 is the voltage value after the battery module is aged, t is the aging time of the battery module, and Δ V is between 0% and 6% for matching gears.
10. The battery recycling method of claim 1, wherein in step S6, the battery module with pulse charging current of 2C, pulse charging time of 5S, and end voltage difference of 100-300mv is used for matching.
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| CN111722128A (en) * | 2020-05-19 | 2020-09-29 | 风帆有限责任公司 | Low-voltage matching method for lithium batteries |
| CN113118056A (en) * | 2021-04-16 | 2021-07-16 | 奇瑞商用车（安徽）有限公司 | Lithium battery echelon utilization screening method |
| CN113210299A (en) * | 2021-03-31 | 2021-08-06 | 深圳供电局有限公司 | Battery pack sorting method, apparatus, computer device and storage medium |
| CN113640683A (en) * | 2021-08-06 | 2021-11-12 | 江苏金帆电源科技有限公司 | Method for identifying abnormal battery |
| CN113655383A (en) * | 2021-08-06 | 2021-11-16 | 广州小鹏汽车科技有限公司 | A battery parameter update method, battery management platform and vehicle |
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