CN109860714B - Capacity grading retraction and extension method of lithium ion battery - Google Patents
Capacity grading retraction and extension method of lithium ion battery Download PDFInfo
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- CN109860714B CN109860714B CN201811445480.7A CN201811445480A CN109860714B CN 109860714 B CN109860714 B CN 109860714B CN 201811445480 A CN201811445480 A CN 201811445480A CN 109860714 B CN109860714 B CN 109860714B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 440
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 435
- 238000000034 method Methods 0.000 title claims abstract description 77
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 89
- 238000007600 charging Methods 0.000 claims description 98
- 238000013461 design Methods 0.000 claims description 55
- 238000007599 discharging Methods 0.000 claims description 24
- 210000001061 forehead Anatomy 0.000 claims description 19
- 238000010277 constant-current charging Methods 0.000 claims description 15
- 238000013480 data collection Methods 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 10
- 238000007405 data analysis Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 42
- 238000010923 batch production Methods 0.000 abstract description 8
- 238000004804 winding Methods 0.000 abstract description 3
- 238000010280 constant potential charging Methods 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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Abstract
The invention is suitable for the technical field of lithium ion battery production, and discloses a capacity grading receiving and releasing method of a lithium ion battery, which comprises a grading relation table establishing procedure and a batch grading procedure, wherein the grading relation table establishing procedure is used for collecting and analyzing capacity information in the grading and capacity grading procedures of a plurality of first lithium ion batteries, and establishing C1‑CPutA grading relation table; the batch grading process comprises a step of formation and a step of grading retraction. The invention provides a capacity grading retraction method of a lithium ion battery, which is characterized in that C is established1‑CPutAfter the stepping relation table is obtained, in the subsequent batch production of the lithium ion battery, only a formation step and a stepping winding and unwinding step are needed, so that the steps of capacity grading and recharging are omitted, the production time of the lithium ion battery is greatly shortened, the production efficiency of the lithium ion battery is effectively improved, and the batch production and manufacturing of the lithium ion battery are facilitated.
Description
Technical Field
The invention relates to the technical field of lithium ion battery production, in particular to a capacity grading folding and unfolding method of a lithium ion battery, which is used for carrying out formation and grading folding and unfolding on an activated lithium ion battery.
Background
Capacity is an important attribute of lithium ion batteries. Although the design capacities of lithium ion batteries with the same specification are the same, the capacities of actually produced lithium ion batteries still have differences within a certain range, and therefore, in the production process of the lithium ion batteries, in order to obtain accurate and qualified capacity values of the lithium ion batteries, the capacities of the lithium ion batteries generally need to be screened, graded and stored.
In the prior art, a capacity grading deploying and retracting method of a lithium ion battery is generally realized by sequentially performing four steps of formation, capacity grading, recharging and grading deploying and retracting of the activated lithium ion battery, wherein the grading deploying and retracting step is mainly operated according to a capacity value of the lithium ion battery obtained in the capacity grading step. However, the complete formation and grading steps have a long actual production time due to the small current used, which seriously reduces the production efficiency of the lithium ion battery and is not beneficial to the mass production and manufacture of the lithium ion battery.
Disclosure of Invention
The invention aims to provide a capacity grading folding and unfolding method of a lithium ion battery, and aims to solve the technical problem that in the prior art, the production efficiency of the lithium ion battery is low due to the fact that procedures from formation to grading folding and unfolding of the activated lithium ion battery are complex.
In order to achieve the purpose, the invention provides the following scheme: the capacity grading deploying and retracting method of the lithium ion battery comprises the following steps:
establishing a grading relation table, collecting and analyzing capacity information in the formation and grading processes of a plurality of first lithium ion batteries, and establishing C1-CPutA grading relation table, wherein C1-CPutA plurality of C's are recorded in the classification relation table1Range class and multiple CPutOne-to-one correspondence information of range class, C1For formation of lithium ion battery to shipment voltage V1Capacity of lithium ion battery, CPutThe discharge capacity of the lithium ion battery from full charge to complete discharge;
the method comprises a batch component-grade process, wherein the batch component-grade process comprises the following steps:
a formation step of forming the activated second lithium ion battery to a shipment voltage V1Placing the second lithium ion battery on shelfIs m between t1Recording the capacity C of the second lithium ion battery1-1Wherein the design parameters of the second lithium ion battery are the same as those of the first lithium ion battery, and the delivery voltage V of the second lithium ion battery1Less than the rated voltage V of the second lithium ion batteryForehead (forehead)；
Step of receiving and releasing in different grades according to C1-1At the C1-CPutC in the stepping relation table1Range grade, determining C of the second lithium ion batteryPutRange class and according to determined CPutAnd the second lithium ion battery is collected and released in a grading manner according to the range grade.
Optionally, the step of establishing the hierarchical relationship table includes:
a data collection step, wherein the data collection step comprises the following steps:
a first charging step of converting each of the activated first lithium ion batteries to a delivery voltage V1Then, each first lithium ion battery is set aside for t2Recording the capacity C of each first lithium ion battery1-2；
A second charging step of fully charging each first lithium ion battery and placing each first lithium ion battery for a placing time t3；
A first discharging step, fully discharging each first lithium ion battery, and laying each first lithium ion battery for a laying time t4Recording the capacity C of each first lithium ion batteryPlacing-1；
A data analysis step of C of each of the first lithium ion batteries1-2And CPlacing-1Performing data analysis to establish C1-CPutA stepping relation table, wherein the plurality of C1Range grade is C of each first lithium ion battery1-2For grading according to C, CPutRange grade is C of each first lithium ion batteryPlacing-1The grading is performed according to the data.
Optionally, the data collecting step further comprises the following steps between the discharging step and the data analyzing step:
a third charging step of charging each of the first lithium ion batteries to a delivery voltage V1Laying aside each first lithium ion battery for a laying aside time t5；
A first step of stepping, collecting and releasing, namely pressing each first lithium ion battery according to CPlacing-1At position CPutAnd carrying out graded retraction and extension in the range grade.
Optionally, the data collection step is implemented on a formation cabinet, and the specific implementation manner is as follows: and arranging a plurality of activated first lithium ion batteries on a formation cabinet, and then sequentially carrying out the first charging step, the second charging step, the discharging step, the third charging step and the first grading folding and unfolding step on each first lithium ion battery through the formation cabinet.
Optionally, the first charging step is implemented as follows: first with a formation current I1Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided withThen, each first lithium ion battery is set aside for t2Recording the capacity C of each first lithium ion battery1-2Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3*CIs provided with，t2Not less than 10 min; and/or the presence of a gas in the atmosphere,
the second charging step is implemented as follows: firstly with a current I2Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches a rated voltage VForehead (forehead)Then at a rated voltage VForehead (forehead)Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided withLaying aside each first lithium ion battery for a laying aside time t3Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I2＝0.3*CIs provided with，t3Not less than 10 min; and/or the presence of a gas in the atmosphere,
the first discharge process step is implemented as follows: with a current I3Performing constant-current discharge on each first lithium ion battery until the voltage of each first lithium ion battery is reduced to a critical voltage VFaceLaying aside each first lithium ion battery for a laying aside time t4Recording the capacity C of each first lithium ion batteryPlacing-1Wherein the critical voltage VFaceIs the critical voltage of the first lithium ion battery when it is completely discharged, I3＝0.5*CIs provided with，CIs provided withT is the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery4Not less than 10 min; and/or the presence of a gas in the atmosphere,
the third charging step is implemented as follows: firstly with a current I4Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided withLaying aside each first lithium ion battery for a laying aside time t5Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I4＝0.5*CIs provided with，t5≥10min。
Optionally, the step of establishing the classification relation table further includes:
the data adjusting step comprises the following steps:
a fourth charging step of converting the plurality of third lithium ion batteries into a delivery voltage V1Laying aside each third lithium ion battery for a laying aside time t6Recording the capacity C of the lithium ion battery1-3Wherein the design parameters of the third lithium ion battery are the same as the design parameters of the first lithium ion battery;
a second step of stepping, collecting and releasing, namely pressing each third lithium ion battery according to C1-3At the C1-CForehead (forehead)C in the stepping relation table1Range grade, respectively determining C of each third lithium ion batteryPutRange class and according to determined CPutThe range grade carries out stepping retraction and extension on each third lithium ion battery;
an aging step of aging each of the third lithium ion batteries;
a fifth charging step of fully charging the aged third lithium ion batteries;
a second discharging step of discharging each of the fully charged third lithium ion batteries and placing each of the third lithium ion batteries for a placing time t7Recording the capacity C of each third lithium ion batteryPlacing-2；
Adjusting the capacity C of each third lithium ion battery1-3、CPlacing-2With C in which it is located1Range class, CForehead (forehead)Comparing and analyzing the range grade, and adjusting each C according to the analysis result1Range values for the range class.
Optionally, the adjusting step is implemented as follows:
if one of said C1Range class, CPutIn each of the third lithium ion batteries of the range class, CPlacing-2Less than CPutThe proportion of the third lithium ion battery in the lower limit value of the range grade reaches a first preset value, and then the C is calculated1The lower limit value of the range grade is increased;
and if one of said C1Range class, CPutIn each of the third lithium ion batteries of the range class, CPlacing-2Greater than CPutThe third lithium ion battery of the upper limit of the range classWhen the ratio of C reaches a second preset value, C is determined1The upper limit value of the range level is adjusted to be low.
Optionally, the fourth charging step and the second gear retraction and extension step are implemented on a formation cabinet, and an implementation manner of the fourth charging step and the second gear retraction and extension step is as follows: a plurality of activated third lithium ion batteries are arranged on a formation cabinet, and then the fourth charging step and the second grading folding and unfolding step are sequentially carried out on each third lithium ion battery through the formation cabinet; and/or the presence of a gas in the atmosphere,
the fourth charging step is implemented as follows: first with a formation current I1Performing constant-current charging on each third lithium ion battery until the voltage of each third lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Performing constant voltage charging on each third lithium ion battery until the current of each third lithium ion battery is reduced to 0.01 × CIs provided withLaying aside each third lithium ion battery for a laying aside time t6Recording the capacity C of the lithium ion battery1-3Wherein, CIs provided withThe design capacity of the first lithium ion battery and the design capacity of the third lithium ion battery are equal to the design capacity of the first lithium ion battery and the design capacity of the second lithium ion battery, and I is more than 01＜0.3*CIs provided with，t6≥10min。
Optionally, the formation step and the grading retraction step are implemented on a formation cabinet, and the implementation manner is as follows: and arranging the plurality of activated second lithium ion batteries on a formation cabinet, and then sequentially carrying out the formation step and the grading folding and unfolding step on each second lithium ion battery through the formation cabinet.
Optionally, the implementation manner of the formation step is: first with a formation current I1Performing constant current charging on the second lithium ion battery until the voltage of the second lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging the second lithium ion battery at constant voltage until the current of the second lithium ion battery is reduced to 0.01 × CIs provided withThe second lithium ion battery is set aside for a set aside timet1Recording the capacity C of the second lithium ion battery1-1Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3*CIs provided with(ii) a And/or the presence of a gas in the atmosphere,
t1≥10min。
the invention provides a capacity grading retraction method of a lithium ion battery, which is characterized in that C is established1-CPutAfter the stepping relation table is obtained, in the subsequent batch production of the lithium ion battery, only a formation step and a stepping winding and unwinding step are needed, so that the steps of capacity grading and recharging are omitted, the production time of the lithium ion battery is greatly shortened, the production efficiency of the lithium ion battery is effectively improved, and the batch production and manufacturing of the lithium ion battery are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a capacity grading retraction method of a lithium ion battery according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a batch archiving process provided in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a step relation table establishing procedure according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram of the data collection procedure provided by the embodiment of the invention;
fig. 5 is a flowchart illustrating a data adjustment procedure according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, a capacity grading storing and releasing method for a lithium ion battery provided by an embodiment of the present invention includes:
a step S100 of establishing a grading relation table, which collects and analyzes the capacity information of a plurality of first lithium ion batteries in the formation and grading processes and establishes C1-CPutA grading relation table, wherein C1-CPutA plurality of C's are recorded in the classification relation table1Range class and multiple CPutOne-to-one correspondence information of range class, C1For formation of lithium ion battery to shipment voltage V1Capacity of lithium ion battery, CPutThe discharge capacity of the lithium ion battery from full charge to complete discharge;
a batch component-level process S200, wherein the batch component-level process S200 includes the following steps:
a formation step S210 of forming the activated second lithium ion battery to a shipment voltage V1Laying aside the second lithium ion battery for a laying aside time t1Recording the capacity C of the second lithium ion battery1-1Wherein the design parameters of the second lithium ion battery are the same as the design parameters of the first lithium ion battery (i.e. the second lithium ion battery and the first lithium ion battery are the same specification lithium ion batteries produced according to the same design parameters and the same process), and the delivery voltage V of the second lithium ion battery1Less than the rated voltage V of the second lithium ion batteryForehead (forehead)；
A step S220 of receiving and releasing in a grading way according to C1-1At the C1-CPutC in the stepping relation table1Range grade, determining C of the second lithium ion batteryPutRange class and according to determined CPutAnd the second lithium ion battery is collected and released in a grading manner according to the range grade.
Specifically, the step relation table establishing step S100 is to establish a voltage V from formation to shipment of the lithium ion batteries by collecting and analyzing capacity information in the formation and capacity grading processes of the plurality of lithium ion batteries1The grading corresponding relation between the capacity of the lithium ion battery and the discharge capacity of the lithium ion battery from full charge to complete discharge is convenient for measuring the formation voltage V to the shipment voltage V of the lithium ion battery in the follow-up process1The lithium ion battery can be directly put in and out in a grading way after the capacity of the lithium ion battery. The batch formation and grading step S200 refers to lithium ion batteries with the same specification, namely C1-CPutAfter the grading relation table is established, different groups can be sequentially processed according to the two steps of the formation step S210 and the grading retraction step S220The secondary lithium ion battery is continuously graded and screened without repeating the grading relation table establishing process S100. The capacity grading deploying and retracting method of the lithium ion battery provided by the embodiment of the invention is to establish C1-CPutAfter the stepping relation table is obtained, in the subsequent batch production of the lithium ion battery, only the formation step S210 and the stepping retraction and release step S220 are needed, so that the steps of capacity grading and recharging are omitted, the production time of the lithium ion battery is greatly shortened, the production efficiency of the lithium ion battery is effectively improved, and the batch production and manufacturing of the lithium ion battery are facilitated.
Preferably, referring to fig. 1 to 4, the classification relation table establishing process S100 includes:
a data collection step S110, wherein the data collection step S110 includes the following steps:
a first charging step S111 for converting each activated first lithium ion battery to a delivery voltage V1Then, each first lithium ion battery is set aside for t2Recording the capacity C of each first lithium ion battery1-2；
A second charging step S112 of fully charging each of the first lithium ion batteries, and placing each of the first lithium ion batteries for a placing time t3；
A first discharging step S113 of fully discharging each of the first lithium ion batteries, and placing each of the first lithium ion batteries for a placing time t4Recording the capacity C of each first lithium ion batteryPlacing-1；
A data analysis step S120 of analyzing C of each of the first lithium ion batteries1-2And CPlacing-1Performing data analysis to establish C1-CPutA stepping relation table, wherein the plurality of C1Range grade is C of each first lithium ion battery1-2For grading according to C, CPutRange grade is C of each first lithium ion batteryPlacing-1The grading is performed according to the data.
The formation step S210 and the first charging step S111 are performed by the same operation on lithium ion batteries with the same specification and different groupsAnd (5) carrying out the following steps. In this embodiment, the first charging step S111 and the second charging step S112 are performed before the first discharging step S113, so that the first lithium ion battery formation-to-shipment voltage V can be obtained through the first charging step S1111Capacity of hour C1-2(ii) a On the other hand, the lithium ion battery can be fully charged through the second charging step S112, so that the first discharging step S113 records the capacity C of the first lithium ion batteryPlacing-1。
Preferably, the data collecting step S110 further includes the following steps provided between the discharging step and the data analyzing step S120:
a third charging step S114 of charging each of the first lithium ion batteries to a delivery voltage V1Laying aside each first lithium ion battery for a laying aside time t5；
A first step S115 of collecting and releasing the first lithium ion batteries according to CPlacing-1At position CPutAnd carrying out graded retraction and extension in the range grade.
The third charging step S114 and the first grading retraction step S115 are arranged so that the data collection step S110 reaches the establishment C1-CPutThe purpose of the grading relation table is to enable the first lithium ion battery to be charged to the delivery voltage V1The charging state of the lithium ion battery is achieved by the step winding and unwinding, so that the first lithium ion battery shell after the data collection step S110 is completed directly enters the next production link, namely the data collection step S110 is completed in the production process of the lithium ion battery, and an independent process is not required to be additionally arranged.
Preferably, the first charging step S111 is implemented as follows: first with a formation current I1Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided with(Here, only C is addedIs provided withIs substituted into the calculation without CIs provided withSubstituted in) and then each of the first lithium ions is addedThe battery is placed for a time t2Recording the capacity C of each first lithium ion battery1-2Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3*CIs provided with(Here, only C is addedIs provided withIs substituted into the calculation without CIs provided withUnit substitution) of (c), t2Not less than 10 min. In the first charging step S111, the first lithium ion battery is first charged with a low current at a constant current to a set voltage value, and then charged with a constant voltage, which is beneficial to ensuring the service life of the finally manufactured lithium ion battery.
Preferably, t is210 min. Theoretically, t2The larger the setting is, the measured capacity C of the first lithium ion battery1-2The more stable and accurate, but too long, the production efficiency of the lithium ion battery is affected. Here, t is2And the setting time is 10min, which is favorable for considering both the capacity stability and the production efficiency of the lithium ion battery.
Preferably, the second charging step S112 is implemented as follows: firstly with a current I2Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches a rated voltage VForehead (forehead)Then at a rated voltage VForehead (forehead)Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided withLaying aside each first lithium ion battery for a laying aside time t3Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I2＝0.3*CIs provided with，t3Not less than 10 min. In the second charging step S112, the first lithium ion battery is first constant-current charged with a small current to a rated voltage VForehead (forehead)And then the first lithium ion battery is charged at a constant voltage, and the charging mode is favorable for ensuring the service life of the finally manufactured lithium ion battery. Charging current I in the second charging step S1122Is larger than the charging current I in the first charging step S1111The service life of the lithium ion battery can be ensured, and the production efficiency of the lithium ion battery can be improved.
Preferably, t is310 min. Theoretically, t3The larger the setting is, the more stable and accurate the measured capacity of the first lithium ion battery is, but the longer the time is, the production efficiency of the lithium ion battery is affected. Here, t is3And the setting time is 10min, which is favorable for considering both the capacity stability and the production efficiency of the lithium ion battery.
Preferably, the first discharging step S113 is implemented as follows: with a current I3Performing constant-current discharge on each first lithium ion battery until the voltage of each first lithium ion battery is reduced to a critical voltage VFaceLaying aside each first lithium ion battery for a laying aside time t4Recording the capacity C of each first lithium ion batteryPlacing-1Wherein the critical voltage VFaceIs the critical voltage of the first lithium ion battery when it is completely discharged, I3＝0.5*CIs provided with，t4Not less than 10 min. The first discharging step S113 is used to completely discharge the first lithium ion battery. When the first lithium ion battery is discharged until the voltage is a certain critical value, the first lithium ion battery is not discharged, namely, the complete discharge of the first lithium ion battery is completed. Discharge current I in the first discharge step S1133Is larger than the charging current I in the second charging step S1122The service life of the lithium ion battery can be ensured, and the production efficiency of the lithium ion battery can be improved.
Preferably, t is410 min. Theoretically, t4The larger the setting is, the more stable and accurate the measured capacity of the first lithium ion battery is, but the longer the time is, the production efficiency of the lithium ion battery is affected. Here, t is4And the setting time is 10min, which is favorable for considering both the capacity stability and the production efficiency of the lithium ion battery.
Preferably, the third charging step S114 is implemented as follows: firstly with a current I4Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment powerPressure V1Then at a delivery voltage V1Performing constant voltage charging on each first lithium ion battery until the current of each first lithium ion battery is reduced to 0.01 × CIs provided withLaying aside each first lithium ion battery for a laying aside time t5Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I4＝0.5*CIs provided with，t5Not less than 10 min. The third charging step S114 is mainly used to charge the first lithium ion battery to a capacity that allows the first lithium ion battery to reach the capacity in the shipment state.
Preferably, t is5＝10min。
Preferably, the data collection step S110 is implemented on a formation cabinet, and the specific implementation manner thereof is as follows: and installing the activated plurality of first lithium ion batteries on a formation cabinet, and then sequentially performing the first charging step S111, the second charging step S112, the discharging step, the third charging step S114 and the first grading folding and unfolding step S115 on each first lithium ion battery through the formation cabinet. In a specific production process, the operation program of the data collection step S110 may be edited in advance in the formation cabinet, so that when the data collection step S110 is operated, the formation cabinet can be controlled to automatically operate the first charging step S111, the second charging step S112, the discharging step and the third charging step S114 only by selecting the corresponding program.
Preferably, as shown in fig. 1 to 5, the step relation table establishing process S100 further includes:
a data adjusting step S130, wherein the data adjusting step S130 includes the following steps:
a fourth charging step S131 of converting the plurality of third lithium ion batteries to a shipment voltage V1Laying aside each third lithium ion battery for a laying aside time t6Recording the capacity C of the lithium ion battery1-3Wherein the design parameters of the third lithium ion battery are the same as the design parameters of the first lithium ion battery (i.e. the third lithium ion battery and the first lithium ion batteryThe battery is a lithium ion battery with the same specification produced according to the same design parameters and the same process);
a second step S132 of collecting and releasing the third lithium ion batteries according to the number C1-3At the C1-CForehead (forehead)C in the stepping relation table1Range grade, respectively determining C of each third lithium ion batteryPutRange class and according to determined CPutThe range grade carries out stepping retraction and extension on each third lithium ion battery;
an aging step S133 of aging each of the third lithium ion batteries;
a fifth charging step S134 of fully charging the aged third lithium ion batteries;
a second discharging step S135, discharging the fully charged third lithium ion batteries, and laying aside the third lithium ion batteries for a rest time t7Recording the capacity C of each third lithium ion batteryPlacing-2；
Adjusting step S136 to adjust the capacity C of each third lithium ion battery1-3、CPlacing-2With C in which it is located1Range class, CForehead (forehead)Comparing and analyzing the range grade, and adjusting each C according to the analysis result1Range values for the range class.
Setting of data adjustment step S130, mainly for C1-CForehead (forehead)Each C in the hierarchical relation table1Range class and CPutThe corresponding relation of the range grades is more accurate, so that excessive grading errors generated in the large-batch grading retraction and extension process of the lithium ion batteries are prevented. The fourth charging step S131, the formation step S210, and the first charging step S111 are steps of performing the same operation on lithium ion batteries of the same specification and different groups; the second step S132 and the step S220 are steps of performing the same operation on lithium ion batteries of the same specification and different groups. The aging step S133 is used to place the third lithium ion battery, so that the voltage of the third lithium ion battery is more accurate and stable.
Preferably, the adjusting step S136 is implemented as follows:
if one of said C1Range class, CPutIn each of the third lithium ion batteries of the range class, CPlacing-2Less than CPutThe proportion of the third lithium ion battery in the lower limit value of the range grade reaches a first preset value, and then the C is calculated1The lower limit value of the range grade is increased;
and if one of said C1Range class, CPutIn each third lithium ion battery of the range class, CPlacing-2Greater than CPutThe proportion of the third lithium ion battery with the range grade of only the upper limit value reaches a second preset value, and then the C is added1The upper limit value of the range level is adjusted to be low.
In this example, each C1Range class and CPutThe range class has a range region. C adjusted in the above way1-CForehead (forehead)A step-by-step relationship table, which can make each C1Range class and CPutThe corresponding relation of the range grade is more accurate.
Preferably, the fourth charging step S131 and the second gear retraction step S132 are implemented on a formation cabinet, and an implementation manner thereof is as follows: and installing the activated plurality of third lithium ion batteries on a formation cabinet, and then sequentially performing the fourth charging step S131 and the second grading storing and releasing step S132 on each third lithium ion battery through the formation cabinet. In the specific production process, the operation program of the fourth charging step S131 can be edited in advance in the formation cabinet, so that when the fourth charging step S131 operates, the fourth charging step S131 can be controlled to automatically operate by selecting the corresponding program, and the operation and the control are convenient.
Preferably, the fourth charging step S131 is implemented as follows: first with a formation current I1Performing constant-current charging on each third lithium ion battery until the voltage of each third lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Performing constant voltage charging on each third lithium ion battery until the current of each third lithium ion battery is reduced to 0.01 × CIs provided withEach of the third lithium ionsLaying the sub-batteries for a laying time t6Recording the capacity C of the lithium ion battery1-3Wherein, CIs provided withThe design capacity of the third lithium ion battery is equal to the design capacity of the second lithium ion battery and the design capacity of the first lithium ion battery, and I is more than 01＜0.3*CIs provided with，t6Not less than 10 min. The fourth charging step S131 is performed by the same process as the first charging step S111, so that the second grading retraction step S132 can analyze the C established in the step S120 using the data1-CPutThe grading relation table is used for grading, collecting and releasing each third lithium ion battery so that the data adjusting step S130 can better perform C1-CPutAnd adjusting the grading relation table.
Preferably, t is610 min. Theoretically, t6The larger the setting is, the measured capacity C of the third lithium ion battery1-3The more stable and accurate, but too long, the production efficiency of the lithium ion battery is affected. Here, t is6And the setting time is 10min, which is favorable for considering both the capacity stability and the production efficiency of the lithium ion battery.
Preferably, the formation step S210 and the grading storing and releasing step S220 are implemented on a formation cabinet, and the implementation manner is as follows: and installing the plurality of activated second lithium ion batteries on a formation cabinet, and then sequentially performing the formation step S210 and the grading storage and release step S220 on each second lithium ion battery through the formation cabinet. In the specific production process, the operation program of the formation step S210 can be edited in advance in the formation cabinet, so that when the formation step S210 is operated, the formation step S210 can be controlled to automatically operate by only selecting the corresponding program, and the operation and the control are convenient.
Preferably, the implementation manner of the formation step S210 is: first with a formation current I1Performing constant current charging on the second lithium ion battery until the voltage of the second lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging the second lithium ion battery at constant voltage until the second lithium ion battery is chargedThe flow was reduced to 0.01 × CIs provided withLaying aside the second lithium ion battery for a laying aside time t1Recording the capacity C of the second lithium ion battery1-1Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3*CIs provided with. In the formation step S210, the second lithium ion battery is first charged with a low current to a set voltage value at a constant current, and then charged with a constant voltage, which is beneficial to ensuring the service life of the finally manufactured lithium ion battery. In addition, the formation step S210 is performed by the same process as the first charging step S111 and the fourth charging step S131, so that the grading retraction step S220 can use the grading relation table to establish the step C established in the step S1001-CPutAnd the grading relation table accurately grades and stores each second lithium ion battery.
Preferably, t is1Not less than 10 min. As a preferred implementation of this embodiment, t110 min. Theoretically, t1The larger the setting is, the more stable and accurate the measured capacity of the first lithium ion battery is, but the longer the time is, the production efficiency of the lithium ion battery is affected. Here, t is1The setting time is 10min, which is beneficial to better considering the capacity stability and the production efficiency of the lithium ion battery.
As a preferred implementation of the embodiment of the present invention, the method for receiving and releasing the capacity of the lithium ion battery in a grading manner includes the following steps:
1) and loading the activated first lithium ion batteries on a cabinet, preferably 1-3 formation cabinets with 512 first lithium ion batteries. The process steps are sent in a verification process step which comprises the following specific steps:
1.1) with a formation current I1Constant current formation to shipment voltage V1Then, the voltage is constant until the cut-off current is 0.01CIs provided withStanding for 10 min;
1.2) at 0.3 × CIs provided withIs charged to full voltage (rated voltage V) by constant currentForehead (forehead)) Then charge to cutoff at constant voltageStopping current at 0.01 deg.C, standing for 10 min;
1.3) 0.5 × CIs provided withIs discharged to a cut-off voltage (critical voltage V) at a constant currentFace) Standing for 10 min;
1.4) charging to the shipment voltage V by a single charging process1Standing for 10 min;
1.5) sorting and clamping according to the capacity sorting standard, namely sorting and clamping according to the capacity grade corresponding to the capacity recorded in the step 1.3).
2) Collecting and analyzing the process data of the verification process step, finding the data corresponding relation between the process step 1.1) and the process step 1.3), and establishing C1-CPutAnd (5) a grading relation table.
3) And loading the activated third lithium ion batteries on a cabinet, preferably loading the third lithium ion batteries on 1-3 formation cabinets, and loading 512 third lithium ion batteries on each formation cabinet. Sending the production steps by the production steps, wherein the production steps are as follows:
3.1) with a formation current I1Constant current formation to shipment voltage V1Then, the voltage is constant until the cut-off current is 0.01CIs provided withStanding for 10 min;
3.2) according to C1-CPutScreening and clamping the third lithium ion batteries by the grading relation table;
4) aging the third lithium ion battery with graded capacity;
5) carrying out full-charge capacity-re-capacitance verification on the aged third lithium ion battery to verify whether the capacity is qualified;
6) analyzing the capacity test result, and adjusting C1-CPutAnd the grading relation table reduces the ratio of low-capacity screening errors and high-capacity screening errors of a specific gear, and improves the capacity distribution of the lithium ion battery.
7) The batch production is carried out in the production steps.
In order to better illustrate the scheme of the embodiment of the present invention, a specific implementation of the capacity grading and deploying method of the lithium ion battery is described below by taking a lithium ion battery with a design capacity of 2000mAh as an example:
1) a group of activated lithium ion batteries with the designed capacity of 2000mAh is loaded on three formation cabinets, and 512 lithium ion batteries are loaded in each formation cabinet. Sending process parameters in a verification process step to perform the following process steps:
1.1) charging to 3960mV with a constant current of 400mA, then charging at constant voltage for 300min, stopping current of 20mA, and standing for 10 min;
1.2) charging to 4200mV with a constant current of 600mA, then charging at constant voltage for 200min, stopping current of 20mA, and standing for 10 min;
1.3) discharging at constant current of 1000mA to 2750mV for 10 min;
1.4) charging to 3960mV with 1000mA current at constant current, then charging at constant voltage for 200min, stopping current at 20mA, and standing for 10 min;
1.5) screening and grading the lithium ion battery according to the capacity of 1.3).
2) Copying the data of the verification step, using the capacity data of the step 1.1) as abscissa and the capacity data of the step 1.3) as ordinate, making a capacity corresponding relation distribution diagram, and establishing and obtaining the following C according to the capacity corresponding relation distribution diagram1-CPutA grading relation table:
3) and loading another group of activated lithium ion batteries with the designed capacity of 2000mAh on three formation cabinets, wherein each formation cabinet is loaded with 512 lithium ion batteries. Sending technological parameters in a production process step to perform the following process steps:
3.1) charging to 3960mV with a constant current of 400mA, then charging at constant voltage for 300min, stopping current of 20mA, and standing for 10 min;
3.2) according to C above1-CPutScreening, grading, collecting and releasing each lithium ion battery by the grading relation table;
4) putting the lithium ion batteries screened and graded according to the 3.2) into an aging room for aging for 7 days, and after aging is finished, carrying out voltage internal resistance matching and code spraying on the lithium ion batteries;
5) putting 48 good lithium ion batteries with each grade in a constant temperature test room for capacity test;
6) the capacity test results were analyzed. The result shows that each capacity gear has a better corresponding relation and can basically meet the delivery requirement. If the capacity test result shows that more capacity errors occur in a certain grade, corresponding adjustment is performed, for example: if the sampling result of 1360 and 1420mAh grades shows that more lithium ion batteries fail to be classified at low capacity, the lower limit value 1360mAh can be increased to 1370mAh to reduce the failure phenomenon of low capacity classification; if the sampling result of 1360 and 1420mAh grades shows that the lithium ion battery with the capacity higher than 2040mAh is larger, the upper limit value of 1420mAh can be properly reduced, so that the capacity distribution is more reasonable.
7) The batch production is carried out in the production steps.
The capacity grading deploying and retracting method of the lithium ion battery provided by the embodiment of the invention is used for grading deploying and retracting the lithium ion battery based on a capacity prediction method without grading, namely the lithium ion battery is only formed into the grading without grading in the batch grading deploying and retracting process, and the problems of overlong capacity forming time and lower efficiency of the lithium ion battery production are effectively solved. The specific capacity grading-free scheme of the invention is that the activated battery is converted into the shipment voltage according to a certain current according to C1-CPutThe grading relation table is used for carrying out capacity grading retraction, so that the production time can be effectively reduced, and meanwhile, a relatively accurate capacity numerical value can be obtained.
The capacity grading retraction and release method of the lithium ion battery provided by the embodiment of the invention is preferably suitable for the lithium ion battery with better first-effect uniformity, and theoretically, the lithium ion battery system with smaller first-effect fluctuation can be produced according to the method without a grading process.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The capacity grading retraction and extension method of the lithium ion battery is characterized by comprising the following steps:
establishing a grading relation table, collecting and analyzing capacity information in the formation and grading processes of a plurality of first lithium ion batteries, and establishing C1-CPutA grading relation table, wherein C1-CPutA plurality of C's are recorded in the classification relation table1Range class and multiple CPutOne-to-one correspondence information of range class, C1For formation of lithium ion battery to shipment voltage V1Capacity of lithium ion battery, CPutThe discharge capacity of the lithium ion battery from full charge to complete discharge;
the method comprises a batch component-grade process, wherein the batch component-grade process comprises the following steps:
a formation step of forming the activated second lithium ion battery to a shipment voltage V1Laying aside the second lithium ion battery for a laying aside time t1Recording the capacity C of the second lithium ion battery1-1Wherein the design parameters of the second lithium ion battery are the same as those of the first lithium ion battery, and the delivery voltage V of the second lithium ion battery1Less than the rated voltage V of the second lithium ion batteryForehead (forehead)；
Step of receiving and releasing in different grades according to C1-1At the C1-CPutC in the stepping relation table1Range grade, determining C of the second lithium ion batteryPutRange class and according to determined CPutAnd the second lithium ion battery is collected and released in a grading manner according to the range grade.
2. The capacity-grading deploying and retracting method of a lithium ion battery according to claim 1, wherein the grading relation table establishing procedure comprises:
a data collection step, wherein the data collection step comprises the following steps:
a first charging step of converting each of the activated first lithium ion batteries into a single cellVoltage V from finished goods to goods delivery1Then, each first lithium ion battery is set aside for t2Recording the capacity C of each first lithium ion battery1-2；
A second charging step of fully charging each first lithium ion battery and placing each first lithium ion battery for a placing time t3；
A first discharging step, fully discharging each first lithium ion battery, and laying each first lithium ion battery for a laying time t4Recording the capacity C of each first lithium ion batteryPlacing-1；
A data analysis step of C of each of the first lithium ion batteries1-2And CPlacing-1Performing data analysis to establish C1-CPutA stepping relation table, wherein the plurality of C1Range grade is C of each first lithium ion battery1-2For grading according to C, CPutRange grade is C of each first lithium ion batteryPlacing-1The grading is performed according to the data.
3. The method for stepping, storing and releasing the capacity of a lithium ion battery according to claim 2, wherein the data collecting step further comprises the following steps between the discharging step and the data analyzing step:
a third charging step of charging each of the first lithium ion batteries to a delivery voltage V1Laying aside each first lithium ion battery for a laying aside time t5；
A first step of stepping, collecting and releasing, namely pressing each first lithium ion battery according to CPlacing-1At position CPutAnd carrying out graded retraction and extension in the range grade.
4. The capacity grading, storing and releasing method of the lithium ion battery according to claim 3, wherein the data collection step is implemented on a formation cabinet, and the specific implementation manner is as follows: and arranging a plurality of activated first lithium ion batteries on a formation cabinet, and then sequentially carrying out the first charging step, the second charging step, the discharging step, the third charging step and the first grading folding and unfolding step on each first lithium ion battery through the formation cabinet.
5. The capacity-grading storing and releasing method of the lithium ion battery according to claim 4, wherein the first charging step is implemented by: first with a formation current I1Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging each first lithium ion battery at constant voltage until the current of each first lithium ion battery is reduced to 0.01 XCIs provided withThen, each first lithium ion battery is set aside for t2Recording the capacity C of each first lithium ion battery1-2Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3× CIs provided with，t2Not less than 10 min; and/or the presence of a gas in the atmosphere,
the second charging step is implemented as follows: firstly with a current I2Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches a rated voltage VForehead (forehead)Then at a rated voltage VForehead (forehead)Charging each first lithium ion battery at constant voltage until the current of each first lithium ion battery is reduced to 0.01 XCIs provided withLaying aside each first lithium ion battery for a laying aside time t3Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I2＝0.3× CIs provided with，t3Not less than 10 min; and/or the presence of a gas in the atmosphere,
the first discharge process step is implemented as follows: with a current I3Performing constant-current discharge on each first lithium ion battery until the voltage of each first lithium ion battery is reduced to a critical voltage VFaceLaying aside each first lithium ion battery for a laying aside time t4Recording the capacity C of each first lithium ion batteryPlacing-1Wherein the critical voltage VFaceIs the critical voltage of the first lithium ion battery when it is completely discharged, I3＝0.5× CIs provided with，CIs provided withT is the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery4Not less than 10 min; and/or the presence of a gas in the atmosphere,
the third charging step is implemented as follows: firstly with a current I4Performing constant-current charging on each first lithium ion battery until the voltage of each first lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging each first lithium ion battery at constant voltage until the current of each first lithium ion battery is reduced to 0.01 XCIs provided withLaying aside each first lithium ion battery for a laying aside time t5Wherein, CIs provided withFor the design capacity of the first lithium ion battery, and the design capacity of the first lithium ion battery is equal to the design capacity of the second lithium ion battery, I4＝0.5× CIs provided with，t5≥10min。
6. The capacity-grading deploying and retracting method of the lithium ion battery according to any one of claims 2 to 5, wherein the grading relation table establishing process further comprises:
the data adjusting step comprises the following steps:
a fourth charging step of converting the plurality of third lithium ion batteries into a delivery voltage V1Laying aside each third lithium ion battery for a laying aside time t6Recording the capacity C of the lithium ion battery1-3Wherein the design parameters of the third lithium ion battery are the same as the design parameters of the first lithium ion battery;
a second step of stepping, collecting and releasing, namely pressing each third lithium ion battery according to C1-3At the C1-CForehead (forehead)In the grading relation tableAt position C1Range grade, respectively determining C of each third lithium ion batteryPutRange class and according to determined CPutThe range grade carries out stepping retraction and extension on each third lithium ion battery;
an aging step of aging each of the third lithium ion batteries;
a fifth charging step of fully charging the aged third lithium ion batteries;
a second discharging step of discharging each of the fully charged third lithium ion batteries and placing each of the third lithium ion batteries for a placing time t7Recording the capacity C of each third lithium ion batteryPlacing-2；
Adjusting the capacity C of each third lithium ion battery1-3、CPlacing-2With C in which it is located1Range class, CForehead (forehead)Comparing and analyzing the range grade, and adjusting each C according to the analysis result1Range values for the range class.
7. The capacity-grading storing and releasing method of the lithium ion battery according to claim 6, wherein the adjusting step is implemented by:
if one of said C1Range class, CPutIn each of the third lithium ion batteries of the range class, CPlacing-2Less than CPutThe proportion of the third lithium ion battery in the lower limit value of the range grade reaches a first preset value, and then the C is calculated1The lower limit value of the range grade is increased;
and if one of said C1Range class, CPutIn each of the third lithium ion batteries of the range class, CPlacing-2Greater than CPutThe proportion of the third lithium ion battery in the upper limit value of the range grade reaches a second preset value, and then the C is calculated1The upper limit value of the range level is adjusted to be low.
8. The capacity-grading storing and releasing method of the lithium ion battery according to claim 6, wherein the fourth charging step and the second grading storing and releasing step are implemented on a formation cabinet, and an embodiment thereof is as follows: a plurality of activated third lithium ion batteries are arranged on a formation cabinet, and then the fourth charging step and the second grading folding and unfolding step are sequentially carried out on each third lithium ion battery through the formation cabinet; and/or the presence of a gas in the atmosphere,
the fourth charging step is implemented as follows: first with a formation current I1Performing constant-current charging on each third lithium ion battery until the voltage of each third lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging each third lithium ion battery at constant voltage until the current of each third lithium ion battery is reduced to 0.01 XCIs provided withLaying aside each third lithium ion battery for a laying aside time t6Recording the capacity C of the lithium ion battery1-3Wherein, CIs provided withThe design capacity of the first lithium ion battery and the design capacity of the third lithium ion battery are equal to the design capacity of the first lithium ion battery and the design capacity of the second lithium ion battery, and I is more than 01＜0.3× CIs provided with，t6≥10min。
9. The lithium ion battery capacity grading storing and releasing method according to any one of claims 1 to 5, characterized in that the formation step and the grading storing and releasing step are implemented on a formation cabinet, and the implementation manner is as follows: and arranging the plurality of activated second lithium ion batteries on a formation cabinet, and then sequentially carrying out the formation step and the grading folding and unfolding step on each second lithium ion battery through the formation cabinet.
10. The capacity-grading storing and releasing method of the lithium ion battery according to claim 9, wherein the implementation manner of the formation step is as follows: first with a formation current I1Performing constant current charging on the second lithium ion battery until the voltage of the second lithium ion battery reaches the shipment voltage V1Then at a delivery voltage V1Charging the second lithium ion battery at constant voltage until the second lithium ion battery is chargedThe current of the sub-battery is reduced to 0.01 XCIs provided withLaying aside the second lithium ion battery for a laying aside time t1Recording the capacity C of the second lithium ion battery1-1Wherein, CIs provided withThe design capacity of the first lithium ion battery is equal to that of the second lithium ion battery, and I is more than 01＜0.3× CIs provided with(ii) a And/or the presence of a gas in the atmosphere,
t1≥10min。
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Effective date of registration: 20220130 Address after: 530031 standard factory building A8, industrial investment (Jiangnan) Enterprise Park, No. 12, Xiajin Road, Jiangnan District, Nanning City, Guangxi Zhuang Autonomous Region Patentee after: Guangxi ares Energy Technology Co.,Ltd. Address before: 518000 buildings 101, 201, 301, B, D and G, building a, No. 1, sifangpu village, Nianfeng community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN ZHUONENG NEW ENERGY LIMITED BY SHARE LTD. |
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