CN113118056A - Lithium battery echelon utilization screening method - Google Patents
Lithium battery echelon utilization screening method Download PDFInfo
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- CN113118056A CN113118056A CN202110412077.XA CN202110412077A CN113118056A CN 113118056 A CN113118056 A CN 113118056A CN 202110412077 A CN202110412077 A CN 202110412077A CN 113118056 A CN113118056 A CN 113118056A
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- 238000012216 screening Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 47
- 238000009413 insulation Methods 0.000 claims description 35
- 238000012360 testing method Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 5
- 238000002679 ablation Methods 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 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
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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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- Chemical & Material Sciences (AREA)
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- Battery Mounting, Suspending (AREA)
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Abstract
The invention discloses a lithium battery echelon utilization screening method, which comprises the following steps: step 1: disassembling the retired battery pack into a battery module; step 2: primarily screening the battery modules, and screening and removing the battery modules with the appearance and the chemical properties which do not meet the requirements; and step 3: 2, carrying out module balancing on the screened modules, carrying out capacity detection, and rejecting battery modules which do not meet the capacity requirement; and 4, step 4: and 3, presetting a module capacity interval aiming at the battery modules screened in the step 3, and using the battery modules in the same capacity interval as battery packs with the same gear capable of being used in a gradient manner.
Description
Technical Field
The invention relates to the field of battery recycling, in particular to a lithium battery echelon utilization screening method.
Background
The new energy automobile industry is rapidly developed, the five-year quality guarantee is about to expire, the power storage battery is about to meet the 'scrapping tide', and in 2020, the accumulated retirement quantity of the power battery in China is about 20 million tons (about 25 GWh); in 2025, the accumulated amount of decommissioning is about 78 ten thousand tons (about 116GWh), wherein about 55 ten thousand tons (accounting for 70% of the total amount of decommissioning) of decommissioned power batteries can enter a echelon utilization link, and the huge amount of decommissioning also enables the recovery of the power batteries to become an urgent problem to be solved in the advancing process of the current industry. Recycle of lithium cell among the prior art generally adopts including electric core level, the module level, whole package level, that is to detect the battery package of retirement, disassemble the back with the battery package, electric core, recycle is provided to the form of module, it is crucial to the industry development to consequently how to select the lithium cell that can echelon utilization, screening to the lithium cell among the prior art is comparatively simple and single, generally judge through the capacity, can produce some troubles to echelon recycle, consequently this application provides one kind and can compromise screening cost and echelon and utilize the diversified lithium cell echelon utilization screening method of usage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a lithium battery echelon utilization screening method, belonging to module-level screening to screen out qualified battery modules for standby.
In order to achieve the purpose, the invention adopts the technical scheme that: a lithium battery echelon utilization screening method comprises the following steps:
step 1: disassembling the retired battery pack into a battery module;
step 2: primarily screening the battery modules, and screening and removing the battery modules with the appearance and the chemical properties which do not meet the requirements;
and step 3: 2, carrying out module balancing on the screened modules, carrying out capacity detection, and rejecting battery modules which do not meet the capacity requirement;
and 4, step 4: and 3, presetting a module capacity interval aiming at the battery modules screened in the step 3, and using the battery modules in the same capacity interval as battery packs with the same gear capable of being used in a gradient manner.
The step 2 comprises the following steps: module outward appearance screening step detects the outward appearance of battery module, rejects the module that the shell broke, electrolyte was revealed, the ablation of copper tablet.
Step 2 also comprises a chemical property screening step:
(1) roughly screening the battery modules, detecting the voltage of each single battery in the battery modules, and if the voltage of any single battery is smaller than a set voltage threshold value V1 or the voltage difference between single batteries in the battery modules is larger than a preset voltage difference, evaluating the module as unqualified and rejecting the module;
(2) carrying out insulation and voltage resistance screening on the battery modules, and rejecting the battery modules which do not accord with the insulation and voltage resistance;
(3) and screening the self-discharge rate of the battery module, and rejecting the battery pack with the self-discharge rate exceeding a set self-discharge rate threshold value.
In step 3, the capacity detection method includes: and charging and discharging the equalized modules, and rejecting the battery modules with cut-off voltage lower than a set value after the charging and discharging are cut off.
In step 4, the battery packs belonging to the same gear and capable of being used in the echelon mode are stored for standby after being supplied with power, and the battery packs are stored for standby after being charged to the same SOC.
And (3) testing the heating film of the battery module aiming at the battery module screened in the step (3), and if the heating film is unqualified, replacing the qualified heating film.
The heating film test comprises: and testing the internal resistance of the heating film and the insulation resistance of the heating film, and judging that the heating film is unqualified when any one of the internal resistance of the heating film and the insulation resistance of the heating film does not meet the requirement.
Carry out withstand voltage screening to battery module and include:
insulating screening: detecting the insulation value of the positive and negative poles of the module to the shell by using an insulation meter, judging the module to be unqualified when the insulation value is smaller than a set insulation threshold value, and rejecting the module;
pressure-resistant screening: and detecting the leakage current of the positive electrode and the negative electrode to the shell by using a voltage withstand instrument, and judging that the shell is unqualified and rejecting the shell when the leakage current is greater than a set leakage current threshold value.
The module appearance screening step also comprises the steps of detecting the acquisition wiring harness, the plug-in, the acquisition terminal and the heating film, and removing the battery pack which cannot be replaced, maintained and acquired wiring harness, the plug-in, the acquisition terminal and the heating film if the battery pack is damaged and cannot be replaced and maintained; and damaging the replaceable battery module to replace the damaged part.
The invention has the advantages that: the realization that can be better is to the screening of lithium cell, carry out orderly reliable and reasonable detection to aspects such as physical characteristic, chemical property, uniformity, and divide into groups for use according to the testing result, thereby guaranteed that the battery module performance in every group is unanimous, make things convenient for echelon utilization to join in marriage the use, the reliability that echelon utilized has been improved, the whole set of screening method sequential operation that this application adopted simultaneously, can obtain the use comparatively extensively, the many battery modules in applicable field, the increase utilization rate just compromises the cost, work load.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a flow chart of the screening method of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
This application utilizes the screening to prior art's echelon and only adopts a capacity screening mode, and the battery module that causes the screening has the condition that the trouble exists very easily, the battery module of screening exists nonconforming and causes subsequent echelon to utilize to exist and can not satisfy the requirement, provides a screening method that lithium cell echelon utilized for realize the screening of module level. The specific scheme is as follows:
as shown in fig. 1, a method for screening lithium batteries by gradient utilization includes:
step 1: disassembling the retired battery pack into a battery module; this application adopts the screening of module level, and the screening of module level has compromise use scene, application scope, and the case of battery package level screening causes a lot of battery packages unqualifiedly very much, can't use for a lot of battery packages can't be utilized echelon, and the case of the screening of electricity core level causes the application domain not enough, and consequently the screening mode of this application is with battery module mode, so with the battery package earlier disassemble into battery module.
Step 2: primarily screening the battery modules, and screening and removing the battery modules with the appearance and the chemical properties which do not meet the requirements;
through outward appearance screening means maintaining or directly rejecting the battery module of damage through visual mode with the parts of damage such as outward appearance damage, wiring, this step belongs to coarse screening, because a module of dismantling, it can not be with whether there is the damage on will looking over its physical state at first, and its specific module outward appearance screening step includes: the outward appearance to battery module detects, rejects the module that the shell broke, electrolyte was revealed, the copper tablet ablates, and the battery module of these states can't continue to use, and the battery has damaged. Detecting a collection wire harness, a plug-in, a collection terminal and a heating film, wherein the parts belong to wearing parts and can be replaced and maintained, and if the collection wire harness, the plug-in, the collection terminal, the heating film and the like are damaged and cannot be replaced and maintained, corresponding battery modules are detected; if damage such as collection pencil, plug-in components, collection terminal, heating film is removable, can maintain, then damaged piece is changed to the battery module that corresponds, gets into next step. The main purpose of this step is to replace the small parts of the battery pack, such as the wire harness, with only one wire harness, when the wire harness is peeled, and the like, and the cost of the wire harness is far lower than the benefit of the module which can be used in a ladder way. Damaged parts such as collecting wire harness skin breaking, plug-in damage and heating film aging; and the collection terminal is loosened, and the heating film is not attached to the collection terminal.
In the step 2, the chemical property screening step mainly detects the chemical property of the battery, because the electrochemical property of the battery is mainly embodied in the aspects of voltage, current, capacity, self-discharge rate and the like, the method selects appropriate electrochemical parameters for rough detection, and specifically comprises the following steps:
(1) roughly screening the battery modules, detecting the voltage of each single battery in the battery modules, and if the voltage of any single battery is smaller than a set voltage threshold value V1 or the voltage difference between single batteries in the battery modules is larger than a preset voltage difference, evaluating the module as unqualified and rejecting the module; the voltage of a single battery in each battery module is detected, the set V1 is the voltage corresponding to the single battery when the battery is attenuated to a certain degree, the voltage exceeds the voltage, the single battery can be used, otherwise the single battery cannot be used, therefore, the V1 is set to detect each single battery, the pressure difference detection refers to the balance consistency problem of each single battery in the battery module, due to the barrel principle, if the difference value between the maximum single battery voltage and the minimum voltage is too large, the whole battery is in the situation that the balance cannot be realized, the service life of the module can be influenced by the later-stage echelon utilization, and the like, and the battery module is used as the screening of the battery core level and is reserved as the screening of the battery core level;
(2) carrying out insulation and voltage resistance screening on the battery modules, and rejecting the battery modules which do not accord with the insulation and voltage resistance; insulating screening: detecting the insulation value of the positive and negative poles of the module to the shell by using an insulation meter, judging the module to be unqualified when the insulation value is smaller than a set insulation threshold value, and rejecting the module; pressure-resistant screening: and detecting the leakage current of the positive electrode and the negative electrode to the shell by using a voltage withstand instrument, and judging that the shell is unqualified and rejecting the shell when the leakage current is greater than a set leakage current threshold value.
(3) And screening the self-discharge rate of the battery module, and rejecting the battery pack with the self-discharge rate exceeding a set self-discharge rate threshold value.
The voltage insulation and resistance of the battery module belongs to safety performance, and must be considered, when the voltage insulation and resistance can not meet the requirements, the battery module can not be used in a gradient manner, and the use safety is influenced; the self-discharge rate refers to the reliability of the battery module, and if the self-discharge rate is too high, the requirement for continuously maintaining the electric quantity cannot be met, and the use requirement cannot be met due to too much self-discharge.
And step 3: 2, carrying out module balancing on the screened modules, carrying out capacity detection, and rejecting battery modules which do not meet the capacity requirement; the capacity detection method comprises the following steps: and charging and discharging the equalized modules, and rejecting the battery modules with cut-off voltage lower than a set value after the charging and discharging are cut off. The method mainly comprises the step of rejecting the batteries with obvious serious attenuation, because the capacity of the batteries is related to cut-off voltage, the capacity is represented by the cut-off voltage, when the voltage is too low, the attenuation is serious and the batteries cannot be used, and the capacity of the batteries is attenuated to a certain degree.
And 4, step 4: and 3, presetting a module capacity interval aiming at the battery modules screened in the step 3, and using the battery modules in the same capacity interval as battery packs with the same gear capable of being used in a gradient manner. Different gears are set, battery modules with the same capacity are grouped together according to the measured capacity and used for echelon utilization for standby, the number of the battery modules corresponding to each capacity interval can be counted in a statistical mode, the battery modules are distinguished according to the median capacity, different capacity intervals are set at intervals according to the 2% capacity difference set in the large-capacity and small-capacity directions respectively, and therefore the battery modules are used as corresponding groups of each capacity, the capacity in each group can be used identically and used echelon, due to the fact that various properties and performances of the battery modules are close to each other, and the middle value of the capacity interval of each group is used as the representation capacity of each module in each group. The battery packs which belong to the same gear and can be used in a gradient mode are stored for standby after being supplied with power, and the battery packs are stored for standby after being charged to the same SOC. And battery damage caused by long-time power failure storage is prevented.
In a preferred embodiment, the heating films of the battery modules screened in step 3, that is, the battery modules grouped in step 4, are tested, and if the heating films are not qualified, the qualified heating films are replaced. Therefore, the battery module is screened out in step 4 and can be used, and the wearing part of the battery heating film is used as an important component part and needs to be detected or replaced, so that the service life and the safety of the battery module are prolonged. The heating film test comprises: and testing the internal resistance of the heating film and the insulation resistance of the heating film, and judging that the heating film is unqualified when any one of the internal resistance of the heating film and the insulation resistance of the heating film does not meet the requirement.
The screening procedure in this application is further detailed below:
1. module visual inspection
Checking the content: the module shell has or not to break, electrolyte has or not to leak, the module copper tablet has or not to ablate corrodes, the module is gathered the pencil and has or not to break broken skin fracture, it has or not hard up to gather the terminal, gather plug-in components have or not damaged, the heating film has or not to age to break, the heating film has or not to laminate with the module.
Directly scrapping the module with broken shell, leaked electrolyte and ablated copper plate; collecting a damaged part of a battery module group for wire harness skin breaking, plug-in damage and heating film aging; and the collection terminal is loosened, and the heating film is not attached to the collection terminal.
2. Coarse screening of module
And measuring the voltage of each monomer of the module, and if any one of the following conditions is met, directly rejecting the module (NOK) for other use or discarding.
Vmin < V1. (taking lithium iron phosphate battery as an example, a battery cell is the lowest value available when the voltage is about 2V, and the battery is seriously attenuated and cannot be used when the voltage is lower than 2V, so that the internal attenuation of the battery cell is serious when the voltage of the battery cell is too low, coarse screening is carried out according to the lowest voltage obtained by experiments when the attenuation does not influence the use, and the condition that the attenuation of a certain cell in a battery module is serious and the use of the whole module is influenced is avoided, and the lowest voltage V1 of the battery cell of a general ternary battery is 2.75V and also belongs to an unusable battery cell when the voltage is lower than the value)
Vmax > V2, and Vmin < V3. (V2, V3 are mainly set to limit the voltage difference of the battery cells in the unified battery pack within a certain range, if the voltage difference between the battery cells is higher than a certain value, the battery module can not be used, and the battery cells have inconsistent characteristics, which can cause the use of the battery module to have problems, such as capacity attenuation, and the like. for example, in the actual setting, the lithium iron phosphate V2 is 3.3V, the V3 is 3.25V, and the ternary battery V2-V3 is more than or equal to 200mv)
(the above parameters V1, V2, V3 can be adjusted according to a specific battery performance)
3. Module insulation withstand voltage detection
Detecting the insulation value of the positive and negative electrodes of the module to the shell by using an insulation table at 500V, wherein the insulation value is not lower than 500M omega, and if the insulation value is lower than 500M omega, the module cannot be used after being rejected;
and detecting leakage current of the positive electrode and the negative electrode to the shell by using a voltage withstand tester, wherein the leakage current is not higher than 10mA for 1 min. If the voltage is higher than 10mA, the voltage is abnormal in fault resistance, and the voltage is rejected and discarded;
4. self-discharge screening
4.1. Discharging the module: and under the environment of 25 +/-2 ℃, discharging at 1C until the lowest monomer voltage V4 is cut off, then discharging at 0.5C until the voltage V4 is cut off, standing for 12h, and counting Vmin, Vmax and pressure difference after standing. (because of different cut-off voltage of charging and discharging, the lithium iron phosphate battery V4 is 2.5V, and the ternary battery V4 is 2.75V)
4.2. Self-discharge screening: the module with Vmax less than or equal to V5 is a qualified module (qualified by self-discharge), and the module with Vmax more than V5 is left for other use or scrapped. Vmax > V5 is unacceptable, and a value greater than V5 indicates excessive self-discharge.
(the setting of the general setting of V5 in the self-discharge rate test is 3.2V for lithium iron phosphate battery V5 and 3.6V for ternary battery V5, which can be set according to the self-discharge rate characteristics of different batteries)
5. Module equalization
And balancing each screened module, wherein the balancing steps are as follows:
v average is total pressure per string of modules
5.1. Determining an equalization object: and balancing all the single strings of which the average | of the | V monomer-V is more than or equal to 15 mv.
5.2. The module voltage is balanced until the module static voltage difference is less than or equal to 100 mv. (this step and step 4 are consecutive actions, equalization being performed after the module has been discharged)
6. Module capacity testing and screening
And charging the equalized module, and measuring the capacity.
1. Charging the module: charging to V6 with 1C current at 25 + -2 deg.C, charging to V7 with 0.5C, charging to V8 with 0.2C, and counting dynamic differential pressure of cut-off of charging, wherein if the differential pressure is more than 300mv, the module is rejected (NOK). The method mainly comprises the steps of rejecting the battery with overlarge single body pressure difference, detecting the battery with overlarge capacity, wherein the battery module with the small capacity state means that the difference between the capacity of the battery module and the average value of other battery modules is larger than a set value, the common capacity is related to cut-off voltage, and when the cut-off voltage is smaller than the average cut-off voltage of the module and the difference value is larger than a certain value, the module capacity is too small and needs to be rejected; when the pressure difference of a plurality of single batteries in the same module is larger than 300mA, the battery module is still unusable, so the minimum voltage of the single batteries can influence the application of the whole module, and the voltage can be rejected
(in this application, when a lithium iron phosphate battery is used, V6 is 3.5V, V7 is 3.6V, and V8 is 3.65V; when a ternary battery is used, V6 is 4V, V7 is 4.15V, and V8 is 4.2V), the same holds true for discharge.
2. Discharging the module: under the environment of 25 +/-2 ℃, 1C discharges to the lowest monomer voltage V4 and is cut off, then 0.5C discharges to V4 and is cut off, the dynamic cut-off pressure difference is counted, if the dynamic pressure difference is more than 500mv, then the (NOK) is removed, the (NOK) is kept still for 30min, the capacity is counted, Vmin, Vmax and static pressure difference are removed after the (NOK) is kept still, and if the static pressure difference is more than 200mv, then the (NOK) is removed.
7. Module set
The module with the capacity difference less than or equal to 2 percent is the first grade.
8. Heating film test
8.1. And testing the internal resistance of the heating film, wherein the internal resistance is in a reasonable range.
8.2. And (3) testing the insulation of the heating film, namely testing the insulation resistance of the two poles of the heating film to the module shell by using an insulation meter with a 500V grade, wherein the insulation value is not less than 500M omega.
8.3. If the heating film is not qualified, the heating film is replaced.
9. Module power-supplementing storage
9.1. Module for instantly packing battery pack
The modules are packaged and serially connected, and then are integrally charged to 50% SOC
9.2. When the module is not used immediately, the module needs to be charged to 50% for storage.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (9)
1. A lithium battery echelon utilization screening method is characterized by comprising the following steps: the method comprises the following steps:
step 1: disassembling the retired battery pack into a battery module;
step 2: primarily screening the battery modules, and screening and removing the battery modules with the appearance and the chemical properties which do not meet the requirements;
and step 3: 2, carrying out module balancing on the screened modules, carrying out capacity detection, and rejecting battery modules which do not meet the capacity requirement;
and 4, step 4: and 3, presetting a module capacity interval aiming at the battery modules screened in the step 3, and using the battery modules in the same capacity interval as battery packs with the same gear capable of being used in a gradient manner.
2. The lithium battery echelon utilization screening method as claimed in claim 1, characterized in that: the step 2 comprises the following steps: module outward appearance screening step detects the outward appearance of battery module, rejects the module that the shell broke, electrolyte was revealed, the ablation of copper tablet.
3. The lithium battery echelon utilization screening method as claimed in claim 1 or 2, characterized in that: step 2 also comprises a chemical property screening step:
(1) roughly screening the battery modules, detecting the voltage of each single battery in the battery modules, and if the voltage of any single battery is smaller than a set voltage threshold value V1 or the voltage difference between single batteries in the battery modules is larger than a preset voltage difference, evaluating the module as unqualified and rejecting the module;
(2) carrying out insulation and voltage resistance screening on the battery modules, and rejecting the battery modules which do not accord with the insulation and voltage resistance;
(3) and screening the self-discharge rate of the battery module, and rejecting the battery pack with the self-discharge rate exceeding a set self-discharge rate threshold value.
4. The lithium battery echelon utilization screening method as claimed in claim 1, characterized in that: in step 3, the capacity detection method includes: and charging and discharging the equalized modules, and rejecting the battery modules with cut-off voltage lower than a set value after the charging and discharging are cut off.
5. The lithium battery echelon utilization screening method as claimed in claim 1, characterized in that: in step 4, the battery packs belonging to the same gear and capable of being used in the echelon mode are stored for standby after being supplied with power, and the battery packs are stored for standby after being charged to the same SOC.
6. The lithium battery echelon utilization screening method as claimed in claim 1, characterized in that: and (3) testing the heating film of the battery module aiming at the battery module screened in the step (3), and if the heating film is unqualified, replacing the qualified heating film.
7. The lithium battery echelon utilization screening method as claimed in claim 6, characterized in that: the heating film test comprises: and testing the internal resistance of the heating film and the insulation resistance of the heating film, and judging that the heating film is unqualified when any one of the internal resistance of the heating film and the insulation resistance of the heating film does not meet the requirement.
8. The lithium battery echelon utilization screening method as claimed in claim 3, characterized in that: carry out withstand voltage screening to battery module and include:
insulating screening: detecting the insulation value of the positive and negative poles of the module to the shell by using an insulation meter, judging the module to be unqualified when the insulation value is smaller than a set insulation threshold value, and rejecting the module;
pressure-resistant screening: and detecting the leakage current of the positive electrode and the negative electrode to the shell by using a voltage withstand instrument, and judging that the shell is unqualified and rejecting the shell when the leakage current is greater than a set leakage current threshold value.
9. The lithium battery echelon utilization screening method as claimed in claim 2, characterized in that: the module appearance screening step also comprises the steps of detecting the acquisition wiring harness, the plug-in, the acquisition terminal and the heating film, and removing the battery pack which cannot be replaced, maintained and acquired wiring harness, the plug-in, the acquisition terminal and the heating film if the battery pack is damaged and cannot be replaced and maintained; and damaging the replaceable battery module to replace the damaged part.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117410609A (en) * | 2023-12-15 | 2024-01-16 | 山西迪诺思新能源科技有限公司 | Echelon utilization method of waste power battery of new energy automobile |
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