CN102280665A - Production method of lithium ion power battery with consistency improved - Google Patents
Production method of lithium ion power battery with consistency improved Download PDFInfo
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- CN102280665A CN102280665A CN2011101832730A CN201110183273A CN102280665A CN 102280665 A CN102280665 A CN 102280665A CN 2011101832730 A CN2011101832730 A CN 2011101832730A CN 201110183273 A CN201110183273 A CN 201110183273A CN 102280665 A CN102280665 A CN 102280665A
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Abstract
The invention discloses a production method of a lithium ion power battery with consistency improved. According to the invention, anode sheets and cathode sheets are obtained through coating and cutting technologies, and are graded according to the weight of each sheet; a total weight of anode sheets in a single battery is controlled through steps that: a group of anode sheets with a total anode sheet number required by the single battery is weighed, wherein the anode sheets can be selected from a middle weight grade, or can be randomly selected from at least two weight grades; according to a measured weight, anode sheets in the grade of a larger weight are replaced by anode sheets in the grade of a smaller weight, or anode sheets in the grade of a smaller weight are replaced by anode sheets in the grade of a larger weight; finally, the total weight of the anode sheets is controlled within a required total weight range. With the production technology modification provided by the invention, consistency of the lithium ion power battery is greatly improved, service life of the lithium ion power battery is prolonged, and application safety of the lithium ion power battery is ensured.
Description
Technical field
The present invention relates to the production method technical field of lithium-ion-power cell.
Background technology
As the lithium-ion-power cell of novel energy storage cell, because of it has high specific energy and high specific power, the ripe technology that discharges and recharges, self discharge is low, and manufacturing environment close friend is pollution-free, the long-life, non-maintaining, become the first-selection in electric automobile stored energy power source.
The technological process of production of lithium-ion-power cell is many, and it is many to influence the battery factor, and the monomer performance that battery is produced through multipaths differs greatly, and this has just influenced the application of lithium-ion-power cell on electric automobile.The energy storage capacity that electric automobile needs is higher, and this just needs to use a lot of cells, adopts series-parallel mode to combine, and satisfies the big capacity of batteries of electric automobile group needs, high-tension requirement.And the consistency that makes up the monomer dynamic lithium battery has like this proposed higher requirement.
We know, lithium battery can not overcharge (charging upper voltage limit restriction), can not cross to put (restriction of discharge lower voltage limit) gross energy that a plurality of cells are combined, determine that according to the wooden barrel principle total capacity is the capacity of cell minimum in the battery pack; If the difference between the series connection monomer is excessive, be easy to cause the little battery of capacity to overcharge and cross and put phenomenon, cause the premature damage of this monomer, the life-span of the whole Battery pack of influence, serious also the safety of battery pack is exerted an influence, be unfavorable for that the normal long-life of battery pack uses.If differing greatly of a plurality of monomer dynamic lithium batteries in parallel, also can reduce because of the weak person's life-span in a plurality of monomers of parallel connection soon, and then other monomer load is strengthened, other battery cell also can shorten in the life-span, each and every one breaks up like this, and the life-span of whole batteries in parallel connection group is had a greatly reduced quality.
At present, common battery production is a selecting method to the employing of battery consistency control method, promptly according to the rules method of testing goes to detect after the electrokinetic cell production process is finished, with detected battery data is foundation, battery is selected, carried out combo according to data according to certain scheme then.Therefore, there is bigger difference in its consistency of battery of producing according to existing process, and must go sorting, the consistency that sorts out like this by last partial volume detection is not real consistency.
Summary of the invention
Technical problem to be solved by this invention is: a kind of production method that improves the lithium-ion-power cell of battery consistency is provided, by improvement to production technology, improve the consistency of lithium-ion-power cell greatly, prolonged battery useful life, guaranteed the safe handling of battery.
For solving the problems of the technologies described above, technical scheme of the present invention is: improve the production method of the lithium-ion-power cell of battery consistency, may further comprise the steps:
(1). coating: the anode sizing agent that contains positive electrode active materials that will mix is coated on the plus plate current-collecting body, and the cathode size that contains negative active core-shell material that mixes is coated on the negative current collector;
(2). cutting of positive plate and negative plate: the plus plate current-collecting body that will be coated with anode sizing agent is cut with the negative current collector that is coated with cathode size, obtains the positive plate of consistent size and the negative plate of consistent size respectively;
(3). the stepping of positive plate and negative plate: each positive plate that branch cuts is weighed, successively positive plate is divided into some grades according to weight is ascending, comprise bay and weight maximum in the minimum shelves of weight, the weight, bay comprises at least one class in the described weight; Each negative plate that branch cuts is weighed, successively negative plate is divided into some shelves, and the class of telling with positive plate is corresponding consistent according to weight is ascending;
(4). the total weight of positive plate control in the single battery: the total value and the total weight value range of the positive plate that the regulation single battery needs;
Choose one group of positive plate of the total value of regulation the positive plate behind stepping and weigh, according to the weight that records, select in following three steps execution a: a. if the weight that records in the total weight value range of regulation, the end of then weighing; B. as if the maximum of the weight that records greater than the total weight value range of regulation, the positive plate in the class then that weight is bigger than normal is replaced with the positive plate in the weight class less than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing; C. as if the minimum value of the weight that records less than the total weight value range of regulation, the positive plate in the class then that weight is less than normal is replaced with the positive plate in the weight class bigger than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing;
Weigh finish after, the positive plate of each single battery is separated according to class;
(5). the combo of positive plate and negative plate: one group of positive plate will finishing total weight control earlier, the one group negative plate consistent in the collocation with its quantity, and the class of negative plate is corresponding consistent with the class of positive plate, the positive plate of each class correspondence is also consistent with the quantity of negative plate, increases the negative plate of the class of weight maximum in this group of a slice negative plate at last on the basis of this group negative plate total quantity again;
(6). the assembling of battery: positive plate and negative plate that combo is finished, sequence interval according to one deck negative plate one deck positive plate stacks, anode ear on the positive plate and the negative electrode lug on the negative plate align respectively, and use battery diaphragm to isolate between positive plate and the negative plate, outermost layer is a negative plate, the both sides correspondence of each positive plate be with the negative plate of class or the negative plate of weight class bigger than normal;
(7) through encapsulation, fluid injection, change into and partial volume detects step, finish the processing of lithium-ion-power cell.
As a kind of optimized technical scheme, in the step (4), one group of positive plate of the total value of the regulation of choosing the positive plate behind stepping is the positive plate of bay in the weight, or the combination of the positive plate of at least two class arbitrarily.
As a kind of optimized technical scheme, bay comprises a class, two class or three class in the described weight.
Adopted technique scheme, the invention has the beneficial effects as follows:
Because parameters such as the performance of lithium-ion-power cell and capacity be coated in active material on positive plate and the negative plate and have and get in touch closely, again because the amount of negative active core-shell material in a battery is greater than effective performance amount of positive electrode active materials, this is in order to prevent that the lithium ion in the positive electrode active materials breaks away from anodal in charging process, when being mounted to negative pole by electrolyte and battery diaphragm, if there are not enough negative active core-shell materials, that lithium ion can form Li dendrite in negative terminal surface, cause the short circuit between the both positive and negative polarity, form the potential safety hazard of battery, the amount of negative active core-shell material relatively and positive electrode active materials need only excessive, general excessive scope is between the 4%-10%, as long as it what are little to the battery performance influence in this scope.Therefore, how much the content of positive electrode active materials in a battery is determining the correlated performance parameters such as capacity of a battery, its equivalent control is to improve the vital measure of cell consistency, as long as the total amount of positive electrode active materials in the cell is carried out strictness control, will produce consistency power lithium-ion battery preferably.
In the production method of lithium-ion-power cell of the present invention, at first through coating, separating and cutting process obtains positive plate and negative plate, though because equipment precision in the coating process, factors such as the difficulty of process control cause coating inconsistent easily, but owing to contain the anode sizing agent of positive electrode active materials through being applied on the plus plate current-collecting body after mixing, therefore, the anode sizing agent amount of the amount of positive electrode active materials and coating on the positive plate is the geometric ratio relation, as long as anode sizing agent coating total amount is identical in the cell after the control coating, the positive electrode active materials amount that just can control cell is identical.
To carry out stepping according to every weight through positive plate and the negative plate that obtains behind coating, the separating and cutting process among the present invention, comprise bay and weight maximum in the minimum shelves of weight, the weight, and bay comprise at least one class in the weight; Then positive plate in the single battery is carried out total weight control: one group of positive plate choosing single battery sum value carries out weighing, it can all be the positive plate of bay in the weight, it also can be the combination of the positive plate of at least two class arbitrarily, according to the weight that records, positive plate in selection the class that wherein wt is bigger than normal is replaced with the positive plate in other weight class less than normal, or select the positive plate in the class that wherein wt is less than normal to replace with the positive plate in other weight class bigger than normal, the total weight of this group positive plate is controlled in the total weight value range of regulation; Pass through the combo of positive plate and negative plate, the assembling of battery then, pass through encapsulation, fluid injection again, change into and partial volume detection step, finish the processing of lithium-ion-power cell.
The total weight of the positive plate in the every joint cell that has guaranteed to produce by above technology is controlled in the value range, because it is consistent cutting the size of the positive plate of back acquisition, the weight of the plus plate current-collecting body of all positive plates equates, therefore, the total weight of the anode sizing agent that is coated with on the positive plate in every joint cell also is controlled in the value range, becomes the total weight of the positive electrode active materials of geometric ratio relation also to be controlled in the value range with anode sizing agent weight.
To sum up, the present invention is controlled at the total weight of the positive electrode active materials in the single battery in the value range, can reach the total weight approximately equal of positive electrode active materials in each battery.Therefore, the present invention has improved the consistency of lithium-ion-power cell greatly, has prolonged battery useful life, has guaranteed the safe handling of battery.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the scatter diagram of drawing according to the battery capacity data of the battery capacity data of prior art production in the table 1 and the embodiment of the invention one production.
Fig. 2 is the scatter diagram of drawing according to the battery capacity data of the battery capacity data of prior art production in the table 2 and the embodiment of the invention two productions.
Embodiment
A kind of production method that improves the lithium-ion-power cell of battery consistency may further comprise the steps:
(1). coating: respectively positive electrode active materials, conductive agent, functional additive, binding agent and solvent are carried out weighing according to the ratio of technological requirement, in de-airing mixer, stir then, obtain anode sizing agent; Respectively negative active core-shell material, conductive agent, functional additive, binding agent and solvent are carried out weighing according to the ratio of technological requirement, in de-airing mixer, stir then, obtain cathode size.
Use coating machine to be coated on the plus plate current-collecting body anode sizing agent that contains positive electrode active materials that mixes according to the positive plate size that designs; The cathode size that contains negative active core-shell material that mixes is coated on the negative current collector according to the negative plate size that designs, and wherein, plus plate current-collecting body adopts aluminium foil or corresponding material, and negative current collector adopts Copper Foil or corresponding material.
(2). cutting of positive plate and negative plate: the plus plate current-collecting body that will be coated with anode sizing agent is cut according to technique initialization size, shape with the negative current collector that is coated with cathode size, obtains the positive plate of consistent size and the negative plate of consistent size respectively.The general anode chip size is larger than the positive plate size, all has the negative active core-shell material of corresponding negative plate relative with all positive electrode active materials on the positive plate in the battery assembling of assurance back.
(3). the stepping of positive plate and negative plate: during owing to the pole piece coating, many-sided reasons such as coating machine mechanical precision and control precision, the weight of pole piece there are differences, the normal distribution in a scope of pole piece weight.Therefore, each positive plate that branch cuts is weighed, successively positive plate is divided into some grades according to weight is ascending, comprise bay and weight maximum in the minimum shelves of weight, the weight, bay comprises at least one class in the described weight; Each negative plate that branch cuts is weighed, successively negative plate is divided into some shelves, and the class of telling with positive plate is corresponding consistent according to weight is ascending.Bay can comprise a class, two class or three class in the described weight, certainly, also can be multiscale more.
(4). the total weight of positive plate control in the single battery: total value and the total weight value range of at first stipulating the positive plate of single battery needs according to the master-plan of production technology, it can be situation according to designing requirement and preceding operation positive plate stepping, determine the intermediate value of a positive plate weight, remove multiply by the total value of positive plate in the single battery with it, draw the total weight value range of positive plate, this total weight value range also can be determined in the master-plan of production technology.
Choose one group of positive plate of the total value of regulation the positive plate behind stepping and weigh, this group positive plate of choosing can be the positive plate that is bay in the weight, also can be the combination of the positive plate of at least two class arbitrarily.According to the weight that records, select in following three steps execution a: a. if the weight that records in the total weight value range of regulation, the end of then weighing; B. as if the maximum of the weight that records greater than the total weight value range of regulation, the positive plate in the class then that weight is bigger than normal is replaced with the positive plate in the weight class less than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing; C. as if the minimum value of the weight that records less than the total weight value range of regulation, the positive plate in the class then that weight is less than normal is replaced with the positive plate in the weight class bigger than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing.
Weigh finish after, the positive plate of each single battery is separated according to class.
(5). the combo of positive plate and negative plate: one group of positive plate will finishing Weight control earlier, the one group negative plate consistent in the collocation with its quantity, and the class of negative plate is corresponding consistent with the class of positive plate, the positive plate of each class correspondence is also consistent with the quantity of negative plate, increases a slice negative plate more at last on the basis of this group negative plate total quantity.According to the excessive principle of negative plate, a slice negative plate of increase belongs to the class of weight maximum in this group negative plate.
(6). the assembling of battery: positive plate and negative plate that combo is finished, sequence interval according to one deck negative plate one deck positive plate stacks, anode ear on the positive plate and the negative electrode lug on the negative plate align respectively, and use battery diaphragm to isolate between positive plate and the negative plate, outermost layer is a negative plate.In order to prevent that battery from having lithium metal to separate out the formation Li dendrite in charge and discharge process, the both sides correspondence of each positive plate be with the negative plate of class or the negative plate of weight class bigger than normal,
(7) encapsulate, fluid injection, change into and partial volume detects step.Encapsulation: the battery that assembles is installed to (various pack case) in the battery case, and positive and negative lug is connected with the positive and negative electrode of battery respectively, reserve reservoir channel and seal other slit; Fluid injection: with packaged battery by dry remove internal moisture after, a certain amount of lithium-ion battery electrolytes is injected into inside battery by reservoir channel; Change into: after the battery of having annotated electrolyte treats that electrolyte soaks into battery fully, on battery charging equipment, carry out the initial charge of battery, enter battery after handling through activation cycle and shelve; Partial volume detects: the battery that will shelve discharges and recharges, and measures performance parameter such as its discharge capacity, and the consistency performance of battery is verified.
So far, finish the processing of lithium-ion-power cell.Better according to its consistency of lithium-ion-power cell that process of the present invention is produced, be the real consistency of producing, rather than by the detected consistency of detection method.
Embodiment one
In the production method of the lithium-ion-power cell of raising battery consistency, be example to produce 100 joint 10Ah batteries.
Wherein, in the step (3), positive plate and negative plate are divided into three class respectively, include bay and weight maximum in minimum grade, one weight of weight.The weight range value of each class correspondence of positive plate: the minimum shelves of weight: more than or equal to 9.01g and smaller or equal to 9.19g; Weight middle apron: more than or equal to 9.2g and smaller or equal to 9.37g; Weight maximum: more than or equal to 9.38g and smaller or equal to 9.55g.
In the step (4), the positive plate to 100 batteries carries out total weight control respectively.The total quantity of positive plate is 14 in the single battery of regulation, and the total weight value range is: 130 ± 0.5g.Compare, the positive plate total quantity of the cell that prior art is produced is identical with the positive plate total quantity of the cell that the present invention produces, but the positive plate total weight is not controlled.As shown in table 1, the data of the 100 joint 10Ah batteries of producing for the method that adopts the embodiment of the invention one and adopt the data of the 100 joint 10Ah batteries that prior art produces.The data of the battery that the method for the employing embodiment of the invention one is produced comprise the quantity of the positive plate of each class in the cell, the total weight of interior all positive plates of cell, and the capacity of cell.
Table 1
Wherein: 1, the battery average size is that the summation of all batteries capacity is divided by number of batteries.
2, the algorithm of battery capacity standard deviation: ask the squared difference of single battery capacity and battery average size earlier, then to the summation of all squared difference, with and value divided by number of batteries, again the data evolution that draws is got on the occasion of.
3, the battery capacity coefficient of standard deviation is: the battery capacity standard deviation is divided by average size.
Be illustrated in figure 1 as the scatter diagram that battery capacity data that the battery capacity data of producing according to prior art in the table 1 and the present invention produce are drawn.Can find out easily by Fig. 1, the battery capacity of 100 batteries that the present invention produces all compares near 10500mAh, fluctuation range is very little, and adopts the battery capacity of 100 batteries of prior art production to fluctuate very big in the scope of 10100mAh-11000mAh.And data show in the table 1, the volumetric(al) standards difference coefficient of 100 batteries that prior art is produced is 0.012549, and the volumetric(al) standards difference coefficient of 100 batteries that employing the inventive method is produced is 0.001137, only is 9% of prior art production battery capacity coefficient of standard deviation.
Adopt the coincident indicator of the battery that battery that the production method of the embodiment of the invention one produces produces than art methods will get well much as can be seen by above data, this has just proved that production method of the present invention can improve the consistency of cell effectively.
Embodiment two
In the production method of the lithium-ion-power cell of raising battery consistency, be example to produce 100 joint 20Ah batteries.
Wherein, in the step (3), positive plate and negative plate are divided into three class respectively, include bay and weight maximum in minimum grade, one weight of weight.The weight range value of each class correspondence of positive plate: the minimum shelves of weight: more than or equal to 13.34g and smaller or equal to 13.62g; Weight middle apron: more than or equal to 13.63g and smaller or equal to 13.9g; Weight maximum: more than or equal to 13.91g and smaller or equal to 14.18g.
In the step (4), the positive plate to 100 batteries carries out total weight control respectively.The total quantity of positive plate is 19 in the single battery of regulation, and the total weight value range is: 261.5 ± 0.5g.Compare, the positive plate total quantity of the cell that prior art is produced is identical with the positive plate total quantity of the cell that the present invention produces, but the positive plate total weight is not controlled.As shown in table 2, the data of the 100 joint 20Ah batteries of producing for the method that adopts the embodiment of the invention two and adopt the data of the 100 joint 20Ah batteries that prior art produces.
Table 2
Wherein: 1, the battery average size is that the summation of all batteries capacity is divided by number of batteries.
2, the algorithm of battery capacity standard deviation: ask the squared difference of single battery capacity and battery average size earlier, then to the summation of all squared difference, with and value divided by number of batteries, again the data evolution that draws is got on the occasion of.
3, the battery capacity coefficient of standard deviation is: the battery capacity standard deviation is divided by average size.
Be illustrated in figure 2 as the scatter diagram that battery capacity data that the battery capacity data of producing according to prior art in the table 2 and the present invention produce are drawn.Can find out easily by Fig. 2, the battery capacity of 100 batteries that the present invention produces all compares near 21200mAh, fluctuation range is very little, and adopts the battery capacity of 100 batteries of prior art production to fluctuate very big in the scope of 20200mAh-22000mAh.And data show in the table 2, the volumetric(al) standards difference coefficient of 100 batteries that prior art is produced is 0.012095, and the volumetric(al) standards difference coefficient of 100 batteries that employing the inventive method is produced is 0.001194, only is 9.9% of prior art production battery capacity coefficient of standard deviation.
Adopt the coincident indicator of the battery that battery that the production method of the embodiment of the invention two produces produces than commonsense method will get well much as can be seen by above data, this has just proved that production method of the present invention can improve the consistency of cell effectively.
Claims (3)
1. improve the production method of the lithium-ion-power cell of battery consistency, it is characterized in that: may further comprise the steps:
(1). coating: the anode sizing agent that contains positive electrode active materials that will mix is coated on the plus plate current-collecting body, and the cathode size that contains negative active core-shell material that mixes is coated on the negative current collector;
(2). cutting of positive plate and negative plate: the plus plate current-collecting body that will be coated with anode sizing agent is cut with the negative current collector that is coated with cathode size, obtains the positive plate of consistent size and the negative plate of consistent size respectively;
(3). the stepping of positive plate and negative plate: each positive plate that branch cuts is weighed, successively positive plate is divided into some grades according to weight is ascending, comprise bay and weight maximum in the minimum shelves of weight, the weight, bay comprises at least one class in the described weight; Each negative plate that branch cuts is weighed, successively negative plate is divided into some shelves, and the class of telling with positive plate is corresponding consistent according to weight is ascending;
(4). the total weight of positive plate control in the single battery: the total value and the total weight value range of the positive plate that the regulation single battery needs;
Choose one group of positive plate of the total value of regulation the positive plate behind stepping and weigh, according to the weight that records, select in following three steps execution a: a. if the weight that records in the total weight value range of regulation, the end of then weighing; B. as if the maximum of the weight that records greater than the total weight value range of regulation, the positive plate in the class then that weight is bigger than normal is replaced with the positive plate in the weight class less than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing; C. as if the minimum value of the weight that records less than the total weight value range of regulation, the positive plate in the class then that weight is less than normal is replaced with the positive plate in the weight class bigger than normal, in the total weight value range that the weight that records is being stipulated, and the end of then weighing;
Weigh finish after, the positive plate of each single battery is separated according to class;
(5). the combo of positive plate and negative plate: one group of positive plate will finishing total weight control earlier, the one group negative plate consistent in the collocation with its quantity, and the class of negative plate is corresponding consistent with the class of positive plate, the positive plate of each class correspondence is also consistent with the quantity of negative plate, increases the negative plate of the class of weight maximum in this group of a slice negative plate at last on the basis of this group negative plate total quantity again;
(6). the assembling of battery: positive plate and negative plate that combo is finished, sequence interval according to one deck negative plate one deck positive plate stacks, anode ear on the positive plate and the negative electrode lug on the negative plate align respectively, and use battery diaphragm to isolate between positive plate and the negative plate, outermost layer is a negative plate, the both sides correspondence of each positive plate be with the negative plate of class or the negative plate of weight class bigger than normal;
(7) through encapsulation, fluid injection, change into and partial volume detects step, finish the processing of lithium-ion-power cell.
2. the production method of the lithium-ion-power cell of raising battery consistency as claimed in claim 1, it is characterized in that: in the step (4), one group of positive plate of the total value of the regulation of choosing the positive plate behind stepping is the positive plate of bay in the weight, or the combination of the positive plate of at least two class arbitrarily.
3. the production method of the lithium-ion-power cell of raising battery consistency as claimed in claim 1 is characterized in that: bay comprises a class, two class or three class in the described weight.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106207265A (en) * | 2016-07-26 | 2016-12-07 | 金龙联合汽车工业（苏州）有限公司 | A kind of raising conforming preparation method of lithium ion battery |
| CN107560697A (en) * | 2017-09-22 | 2018-01-09 | 湖南科霸汽车动力电池有限责任公司 | A kind of online full inspection method of anode sheet weight |
| CN107565172A (en) * | 2017-10-18 | 2018-01-09 | 山东圣阳电源股份有限公司 | A kind of lithium ion battery manufacture method |
| CN112490513A (en) * | 2020-12-21 | 2021-03-12 | 潍坊聚能电池有限公司 | Method for improving battery capacity consistency |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
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| CN101867058A (en) * | 2010-07-09 | 2010-10-20 | 湖南科霸汽车动力电池有限责任公司 | Manufacturing method for electric core |
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| CN101867058A (en) * | 2010-07-09 | 2010-10-20 | 湖南科霸汽车动力电池有限责任公司 | Manufacturing method for electric core |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207265A (en) * | 2016-07-26 | 2016-12-07 | 金龙联合汽车工业（苏州）有限公司 | A kind of raising conforming preparation method of lithium ion battery |
| CN106207265B (en) * | 2016-07-26 | 2019-01-15 | 金龙联合汽车工业（苏州）有限公司 | A kind of preparation method improving lithium ion battery consistency |
| CN107560697A (en) * | 2017-09-22 | 2018-01-09 | 湖南科霸汽车动力电池有限责任公司 | A kind of online full inspection method of anode sheet weight |
| CN107560697B (en) * | 2017-09-22 | 2019-08-13 | 湖南科霸汽车动力电池有限责任公司 | A kind of online full inspection method of anode sheet weight |
| CN107565172A (en) * | 2017-10-18 | 2018-01-09 | 山东圣阳电源股份有限公司 | A kind of lithium ion battery manufacture method |
| CN112490513A (en) * | 2020-12-21 | 2021-03-12 | 潍坊聚能电池有限公司 | Method for improving battery capacity consistency |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
| CN114069075B (en) * | 2021-10-27 | 2024-04-05 | 风帆有限责任公司 | Self-discharge screening method for lithium ion battery |
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