CN114152882B - Method for avoiding mass production quality problems of lithium ion batteries - Google Patents
Method for avoiding mass production quality problems of lithium ion batteries Download PDFInfo
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- CN114152882B CN114152882B CN202111271848.4A CN202111271848A CN114152882B CN 114152882 B CN114152882 B CN 114152882B CN 202111271848 A CN202111271848 A CN 202111271848A CN 114152882 B CN114152882 B CN 114152882B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 24
- 238000010923 batch production Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 claims description 16
- 239000007772 electrode material Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 241000519995 Stachys sylvatica Species 0.000 claims description 4
- 239000013543 active substance Substances 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
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Abstract
According to the method, whether the tightness ratio between the pole piece group and the battery shell is proper, whether the current formation system is applicable and whether the pole piece group alignment condition meets the requirements or not is verified through the preceding piece manufacturing, electrical property testing and pole piece surface state observation and detection after disassembly of each batch of lithium ion batteries, and a conclusion that whether batch production can be carried out according to the preceding piece process state is given, so that batch scrapping of a lithium ion battery layer is effectively avoided, loss is controlled at the pole piece layer, unnecessary loss is avoided, and further the reliability of the lithium ion battery is improved.
Description
Technical Field
The invention relates to a method for avoiding mass production quality problems of lithium ion batteries.
Background
Along with the wider application of lithium ion batteries in the 3C field, the power battery field and the energy storage battery field, how to avoid the mass production quality problem of lithium ion batteries is an important object of attention in the production process of lithium ion battery manufacturers at home and abroad in a mode of batch rolling production.
The reasons for mass production quality problems of lithium ion batteries mainly comprise two main reasons except raw material factors, one is the quality problem of the pole piece, and the other is the defect of the pole piece in the pole piece manufacturing process of pulping, coating, rolling, slitting, die cutting and the like; the other type is the problem introduced in the process of monomer assembly and test, and comprises abnormal phenomena caused by improper tightness ratio, unsatisfied requirements of pole piece group alignment and inapplicable formation system.
If problems of pole piece quality, monomer assembly process and test conditions are found during batch production, the whole batch does not meet the index requirement, and the lithium ion battery is scrapped in batches, so that huge losses are brought to manufacturers. Therefore, in order to avoid the mass production quality problem of lithium ion batteries, a certain amount of positive electrode plates and negative electrode plates are required to be extracted before mass production, and the lithium ion batteries (hereinafter referred to as 'preceding parts') are formed after monomer assembly and liquid injection formation according to process files and process flows, so that performance verification is performed on the lithium ion batteries, a conclusion is made as to whether mass production can be performed according to the process state of the preceding parts, the loss is controlled at the electrode plate level, the reliability of the lithium ion batteries is improved, and unnecessary loss is avoided. Therefore, the development of the lithium ion battery mass production quality problem avoiding method has great practical significance.
Disclosure of Invention
The invention aims at: according to the method, whether the tightness ratio between the pole piece group and the battery shell is proper, whether the current formation system is applicable and whether the pole piece group alignment condition meets the requirements or not is verified through the preceding piece manufacturing, electrical property testing and pole piece surface state observation and detection after disassembly of each batch of lithium ion batteries, and a conclusion that batch production can be carried out according to the preceding piece process state is given, so that batch scrapping of a lithium ion battery layer is effectively avoided, loss is controlled at the pole piece layer, unnecessary loss is avoided, and further the reliability of the lithium ion battery is improved.
The technical scheme of the invention is as follows: a method for avoiding mass production quality problems of lithium ion batteries comprises the following steps:
1) After the batch production of the positive and negative electrode plates is finished, the weight and the water content of the positive and negative electrode plates are checked, specific parameters and index requirements can be selected according to different lithium ion electrode materials and storage battery capacities, if the parameters meet the requirements, the next procedure is carried out, and if the parameters do not meet the requirements, the batch of pole plate products are scrapped or used as test products;
2) From positive electrodeExtracting two groups of pole pieces, J Positive 1 And J Positive 2 Extracting two groups of pole pieces from the negative pole piece, namely J Negative 1 And J Negative 2 The extracted pole pieces are randomly extracted from pole pieces obtained by die cutting of all pole piece rolls, and the quantity of the pole pieces extracted from the pole pieces obtained by die cutting of each pole piece roll is equivalent;
3) For the extracted J Positive 1 、J Negative 1 The thickness measurement is carried out on each pole piece, and the average value of the thicknesses of the positive pole piece and the negative pole piece is calculated according to the thickness measurement result of each pole piece;
4) The tightness of the pole piece group is calculated before lamination, the tightness= (positive pole piece thickness x positive pole piece number + negative pole piece thickness x negative pole piece number + diaphragm thickness x diaphragm layer number + bushing thickness)/the inner cavity thickness of the battery shell, and the number J of positive pole pieces and the number J of negative pole pieces required by each preceding piece are determined according to the tightness requirement Positive 3 、J Negative 3 The method comprises the steps of carrying out a first treatment on the surface of the The preceding piece refers to a lithium ion storage battery formed by extracting a certain amount of positive electrode pieces and negative electrode pieces before batch production, and performing monomer assembly, liquid injection, formation and capacity test according to process files and process flows;
5) At the extracted J Positive 2 、J Negative 2 In the pole piece, several groups J are selected Positive 3 Positive electrode sheets of the number J Negative 3 Weighing the number of the negative plate groups, wherein the weight of the negative plate groups meets the requirements of manufacturers;
6) Performing assembly, liquid injection, formation and capacity test of a preceding part according to the technical process of the lithium ion battery;
7) At constant current I for lithium ion battery 1 Charging to a charging cut-off voltage V specified by the manufacturer 0 Rest time T 0 ；
8) At constant voltage V for lithium ion battery 0 Charging to current drop to I 2 Rest time T 1 ；
9) Judging the first formation efficiency and capacity test results, disassembling the lithium ion battery, observing and detecting the surface state of the pole pieces to judge whether the tightness ratio is proper, whether the alignment condition of the pole piece group meets the requirement, whether a formation system is applicable, whether other abnormal conditions exist and the like, and giving a conclusion whether batch production can be carried out according to the prior process state;
10 If the test result of the step 9) and the surface state of the pole piece are not abnormal, batch production can be started according to the process state of the preceding piece, if the test result of the step 9) and the surface state of the pole piece are abnormal, review and test work are carried out, batch production is not allowed to be carried out, the preceding piece is required to be manufactured again after the reason is found out until the surface state of the pole piece is not abnormal after the preceding piece is disassembled, and if the test result of the preceding piece and the surface state of the pole piece are always abnormal due to the batch problem of the pole piece, the batch of pole pieces are scrapped.
The weight of the positive plate in the step 1) is 1.0 g-6.0 g, the weight of the negative plate is 1.0 g-4.5 g, and the water content of the positive plate and the negative plate is less than 100 ppm-150 ppm.
J in the step 2) Positive 1 、J Negative 1 30 to 50 pieces, J Positive 2 、J Negative 2 Not less than the number of pole pieces required to make the precursor.
In the step 3), for the extracted J Positive 1 、J Negative 1 When each pole piece in the pair is subjected to thickness measurement, the number of thickness measurement points is 3-5, and the thickness measurement points comprise upper, middle and lower positions in the length direction of the pole piece.
In the step 4), the tightness is in the range of 0.93-0.98, wherein the number of positive plates is (40-110) +/-2, the number of negative plates is (41-111) +/-2, the number of negative plates is one more than that of positive plates, and the number of membrane layers is the sum of the number of positive plates, the number of negative plates and the number of membrane winding layers.
In the step 5), the number of the positive and negative electrode plate groups is 3-5, wherein the weight of the positive electrode plate group is 30-600 g, and the weight of the negative electrode plate group is 20-400 g.
In the step 6), the number of the preceding members is 3-5, and the assembly method, the liquid injection amount and the formation method can be selected according to different battery structures, different lithium ion electrode material characteristics and different capacities.
In the step 7), I 1 Is C/5-C/3, V 0 Is 4.1V-4.2V, T 0 Is 10 to 30 minutes.
In the step 8), I 2 Is I 1 1/5 to 1/2 of (T) 1 No more than 5 days.
In the step 9), the index requirements of the first formation efficiency and capacity are determined according to the electrode material characteristics and the different capacities of the lithium ion battery, wherein the surface states of the pole pieces are observed and detected, and the method comprises the following steps: 1) Whether white spots are visible or not on the surface of the negative plate; 2) Whether the edge of the positive plate is completely enveloped by the negative plate or not; 3) Whether the bonding force of the pole piece active substance is good or not; 4) Whether other anomalies exist.
The beneficial effects of the invention are as follows: according to the method for avoiding the mass production quality problem of the lithium ion battery, provided by the invention, whether the tightness ratio between the pole piece group and the battery shell is proper, whether the pole piece group alignment condition meets the requirement or not and whether the current formation system is applicable or not are verified through the preceding piece manufacture, the electrical property test and the observation and detection of the surface state of the pole piece after disassembly of each batch of lithium ion batteries, and a conclusion that whether mass production can be carried out according to the preceding piece process state is given, so that basis or guidance is provided for the structure composition and the process state of the mass production pole piece group, the mass production quality problem in the lithium ion battery production process is effectively avoided, unnecessary loss is avoided, and the reliability of the lithium ion battery is further improved.
Drawings
Fig. 1 is a schematic view of a thickness measurement point of a pole piece.
Fig. 2 is a negative electrode sheet of a lithium ion battery after the preceding member is disassembled.
Detailed Description
The method for avoiding the mass production quality problem of the lithium ion battery provided by the invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
The method comprises the following steps:
after the batch production of the positive and negative electrode plates is finished, checking parameters such as the weight, the water content and the like of the positive and negative electrode plates in the batch, wherein specific parameters and index requirements can be selected according to different lithium ion electrode materials and storage battery capacities, if the parameters meet the requirements, entering the next process, and if the parameters do not meet the requirements, scrapping the electrode plate products in the batch or taking the electrode plate products in the batch as test products; wherein the weight of the positive plate is 1.0 g-6.0 g, the weight of the negative plate is 1.0 g-4.5 g, the water content of the positive plate is less than 100-150 ppm, in the embodiment, the weight of the positive plate is 4.80 g-5.01 g, the weight of the negative plate is 3.36 g-3.45 g, the water content of the positive plate is 14.8ppm, and the water content of the negative plate is 13.5ppm;
step 2, extracting two groups of pole pieces from the positive pole piece, namely J Positive 1 And J Positive 2 Extracting two groups of pole pieces from the negative pole piece, namely J Negative 1 And J Negative 2 The extracted pole pieces should show randomness and representativeness as much as possible, the pole pieces obtained from the die cutting of all pole piece rolls are randomly extracted, and the quantity of the pole pieces extracted from the die cutting of each pole piece roll is equivalent, wherein J is as follows Positive 1 、J Negative 1 30 to 50 pieces, J Positive 2 、J Negative 2 Should not be smaller than the number of pole pieces required for making the precursor, in this embodiment J Positive 1 、J Negative 1 All are 30 pieces, J Positive 2 、J Negative 2 240 tablets;
step 3 for extraction of J Positive 1 、J Negative 1 The thickness measurement is carried out on each pole piece, and the average value of the thicknesses of the positive pole piece and the negative pole piece is calculated according to the thickness measurement result of each pole piece, wherein the number of the thickness measurement points of each pole piece is 3-5, and the thickness measurement points of each pole piece comprise upper, middle and lower positions in the length direction of the pole piece; in this example, the thickness of each sheet was 4, the average value of the positive sheet thickness was 135.6 μm, and the average value of the negative sheet thickness was 167.8 μm;
step 4, calculating the tightness of the pole piece group before lamination, wherein the tightness= (positive pole piece thickness x positive pole piece number + negative pole piece thickness x negative pole piece number + diaphragm thickness x diaphragm layer number + bushing thickness)/battery shell inner cavity thickness, and determining the number J of positive pole pieces and negative pole pieces required by each preceding piece according to the tightness requirement Positive 3 、J Negative 3 Wherein the tightness is in the range of 0.93-0.98, the number of positive plates is (40-110) +/-2, the number of negative plates is (41-111) +/-2, the specific number is selected according to the characteristics of different lithium ion electrode materials and different capacities, the number of negative plates is more than that of positive plates, and the number of membrane layers is the number of positive plates, the number of negative plates and the membraneThe sum of the winding layers; in the embodiment, the tightness is 0.959, the number of positive plates is 76, and the number of negative plates is 77;
step 5 at extraction J Positive 2 、J Negative 2 In the pole piece, several groups J are selected Positive 3 Positive electrode sheets of the number J Negative 3 The number of the negative plate groups is weighed, the weight of the negative plate groups meets the requirements of manufacturers, wherein the number of the positive plate groups and the negative plate groups is 3-5 groups which are consistent with the number of the preceding pieces, the weight of the positive plate groups is 30-600 g, the weight of the negative plate groups is 20-400 g, and the specific weight is selected according to the characteristics and the different capacities of different lithium ion electrode materials; in the embodiment, 3 positive and negative plate groups are selected respectively, the weights of the positive plate groups are 372.72g, 372.69g and 372.88g respectively, and the weights of the negative plate groups are 261.75g, 261.71g and 261.68g respectively;
step 6, performing assembly, liquid injection, formation and capacity test on preceding parts according to the technical process of the lithium ion battery, wherein the number of the preceding parts is generally 3-5, and the assembly method, the liquid injection amount and the formation method can be selected according to different battery structures, different lithium ion electrode material characteristics and different capacities; in this embodiment, the number of preceding members is 3;
step 7, constant current I is applied to the lithium ion battery 1 Charging to a charging cut-off voltage V specified by the manufacturer 0 Rest time T 0 ；
Step 7 constant current I 1 The size of (2) may be selected according to the capacity of the lithium ion battery. Assuming that the capacity of the lithium ion battery is C (unit: ah), the constant current I 1 The size of the battery can be C/5-C/3 (unit: A), in this embodiment, the capacity of the lithium ion battery is 30Ah, and the constant current I 1 Is 6A in size. The charge cut-off voltage V 0 Can be 4.0V-4.2V, and can be selected according to different electrode material characteristics of the lithium ion battery so as to enable the lithium ion battery to be close to a full state, and in the embodiment, the charging cut-off voltage is 4.1V. The rest time T 0 Can be 10-30 min, in this embodiment, the rest time is T 0 For 10min.
Step 8 for lithium ion batteryThe cell is at constant voltage V 0 Charging to current drop to I 2 Rest time T 1 Wherein I 2 About I 1 1/5 to 1/2 of (C), wherein T 1 Should be no more than 5 days;
step 8 the charge cut-off current I 2 About I 1 1/5 to 1/2 of the total charge state of the lithium ion battery, in this embodiment, the charge cutoff current I 2 0.05C. The T is 1 Should not be greater than 5 days, in this example T 1 1 day;
step 9, judging and reading the first formation efficiency and capacity test results, disassembling the lithium ion battery, observing and detecting the surface state of the pole pieces to judge whether the tightness ratio is proper, whether the alignment condition of the pole piece group meets the requirement, whether a formation system is applicable, whether other abnormal conditions exist and the like, and giving a conclusion whether batch production can be carried out according to the prior process state; the index requirements of the first formation efficiency and capacity are determined according to the electrode material characteristics and the different capacities of the lithium ion battery, and in the embodiment, the first formation efficiency is not lower than 85%, and the capacity is not lower than 33Ah; wherein observe, detect the surface condition of pole piece, include: 1) Whether white spots are visible or not on the surface of the negative plate; 2) Whether the edge of the positive plate is completely enveloped by the negative plate or not; 3) Whether the bonding force of the pole piece active substance is good or not; 4) Whether other anomalies exist.
And step 10, if the test result of the step 9 and the surface state of the pole piece are not abnormal, batch production can be started according to the process state of the preceding piece, if the test result of the step 9 and the surface state of the pole piece are abnormal, review and test work should be carried out, batch production is not allowed to be carried out, the preceding piece is required to be manufactured again after the reason is found out until the surface state of the pole piece is not abnormal after the preceding piece is disassembled, and if the test result of the preceding piece and the surface state of the pole piece are always abnormal due to the batch problem of the pole piece, the batch pole piece is scrapped.
Fig. 1 is a schematic view of thickness measurement points of pole pieces, wherein the number of thickness measurement points of each pole piece is 4, and the pole piece comprises upper, middle and lower positions in the length direction of the pole piece.
Fig. 2 shows a negative electrode sheet after the preceding member of the lithium ion battery is disassembled, the preceding member is charged to 4.1V after the formation and capacity test are completed, the full-charge state is disassembled, the surface state of the negative electrode sheet is observed, the surface of the negative electrode is found to be in a relatively uniform dark brown color and no white spots, and the edge of the positive electrode sheet is completely enveloped by the negative electrode sheet.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A method for avoiding mass production quality problems of lithium ion batteries is characterized by comprising the following steps:
1) After the batch production of the positive and negative electrode plates is finished, the weight and the water content of the positive and negative electrode plates are checked, specific parameters and index requirements are selected according to different lithium ion electrode materials and storage battery capacities, if the parameters meet the requirements, the next procedure is carried out, and if the parameters do not meet the requirements, the batch of pole plate products are scrapped or used as test products;
2) Extracting two groups of pole pieces from the positive pole piece, which are J respectively Positive 1 And J Positive 2 Extracting two groups of pole pieces from the negative pole piece, namely J Negative 1 And J Negative 2 Randomly extracting the pole pieces obtained by die cutting all the pole piece rolls, wherein the quantity of the pole pieces extracted by die cutting each pole piece roll is equivalent;
3) For the extracted J Positive 1 、J Negative 1 The thickness measurement is carried out on each pole piece, and the average value of the thicknesses of the positive pole piece and the negative pole piece is calculated according to the thickness measurement result of each pole piece;
4) The tightness of the pole piece group is calculated before lamination, the tightness= (positive pole piece thickness x positive pole piece number + negative pole piece thickness x negative pole piece number + diaphragm thickness x diaphragm layer number + bushing thickness)/the inner cavity thickness of the battery shell, and the number J of positive pole pieces and the number J of negative pole pieces required by each preceding piece are determined according to the tightness requirement Positive 3 、J Negative 3 The method comprises the steps of carrying out a first treatment on the surface of the The preceding piece refers to a piece extracted before batch productionThe quantitative positive plate and the quantitative negative plate are subjected to monomer assembly, liquid injection, formation and capacity test according to the process files and the process flow to form the lithium ion storage battery;
5) At the extracted J Positive 2 、J Negative 2 In the pole piece, several groups J are selected Positive 3 Positive electrode sheets of the number J Negative 3 Weighing the number of the negative plate groups, wherein the weight of the negative plate groups meets the requirements of manufacturers;
6) Performing assembly, liquid injection, formation and capacity test of a preceding part according to the technical process of the lithium ion battery;
7) At constant current I for lithium ion battery 1 Charging to a charging cut-off voltage V specified by the manufacturer 0 Rest time T 0 ；
8) At constant voltage V for lithium ion battery 0 Charging to current drop to I 2 Rest time T 1 ；
9) Judging the first formation efficiency and capacity test results, disassembling the lithium ion battery, observing and detecting the surface state of the pole pieces to judge whether the tightness ratio is proper, whether the alignment condition of the pole piece group meets the requirement, whether a formation system is applicable and whether other abnormal conditions exist, and giving a conclusion whether batch production can be carried out according to the prior process state;
10 If the test result of the step 9) and the surface state of the pole piece are not abnormal, batch production is started according to the process state of the preceding piece, if the test result of the step 9) and the surface state of the pole piece are abnormal, the batch production is carried out, meanwhile, batch production is not allowed to be carried out, the preceding piece is required to be manufactured again after the reason is found out, batch production can be carried out until the surface state of the pole piece is not abnormal after the preceding piece is disassembled, and if the test result of the preceding piece and the surface state of the pole piece are always abnormal due to the batch problem of the pole piece, the batch pole piece is scrapped.
2. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: the weight of the positive plate in the step 1) is 1.0 g-6.0 g, the weight of the negative plate is 1.0 g-4.5 g, and the water content of the positive plate and the negative plate is less than 100ppm.
3. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: j in the step 2) Positive 1 、J Negative 1 30 to 50 pieces, J Positive 2 、J Negative 2 Not less than the number of pole pieces required to make the precursor.
4. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 3), for the extracted J Positive 1 、J Negative 1 When each pole piece in the pair is subjected to thickness measurement, the number of thickness measurement points is 3-5, and the thickness measurement points comprise upper, middle and lower positions in the length direction of the pole piece.
5. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 4), the tightness is in the range of 0.93-0.98, wherein the number of positive plates is 40-110, the number of negative plates is 41-111, the number of negative plates is one more than that of positive plates, and the number of membrane layers is the sum of the number of positive plates, the number of negative plates and the number of membrane winding layers.
6. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 5), the number of the positive and negative electrode plate groups is 3-5, wherein the weight of the positive electrode plate group is 30-600 g, and the weight of the negative electrode plate group is 20-400 g.
7. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 6), the number of the preceding members is 3-5, and the assembling method, the liquid injection amount and the formation method are selected according to different battery structures, different lithium ion electrode material characteristics and different capacities.
8. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, characterized in thatIn the following steps: in the step 7), I 1 Is C/5-C/3, V 0 Is 4.1V-4.2V, T 0 Is 10 to 30 minutes.
9. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 8), I 2 Is I 1 1/5 to 1/2 of (T) 1 No more than 5 days.
10. The method for avoiding mass production quality problems of lithium ion batteries according to claim 1, wherein the method comprises the following steps: in the step 9), the index requirements of the first formation efficiency and capacity are determined according to the electrode material characteristics and the different capacities of the lithium ion battery, wherein the surface states of the pole pieces are observed and detected, and the method comprises the following steps: 1) Whether white spots are visible or not on the surface of the negative plate; 2) Whether the edge of the positive plate is completely enveloped by the negative plate or not; 3) Whether the bonding force of the pole piece active substance is good or not; 4) Whether other anomalies exist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111271848.4A CN114152882B (en) | 2021-10-29 | 2021-10-29 | Method for avoiding mass production quality problems of lithium ion batteries |
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