CN104607395B - Lithium ion battery method for separating - Google Patents

Lithium ion battery method for separating Download PDF

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Publication number
CN104607395B
CN104607395B CN201310535846.0A CN201310535846A CN104607395B CN 104607395 B CN104607395 B CN 104607395B CN 201310535846 A CN201310535846 A CN 201310535846A CN 104607395 B CN104607395 B CN 104607395B
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lithium ion
ion battery
discharge
current
constant
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CN104607395A (en
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李凌峰
张君鸿
杨伟斌
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Kunming Branch of BAIC Yunnan Ruili Automobile Co., Ltd
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Beiqi Foton Motor Co Ltd
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Abstract

The invention discloses a kind of lithium ion battery method for separating, comprises the following steps:Multiple lithium ion batteries are charged respectively to being full of;Carry out charged holding;By each lithium ion battery, under the first discharge current multiplying power, constant-current discharge, to discharge cut-off voltage, records the first discharge capacity;Constant-current constant-voltage charging is carried out to each lithium ion battery to being full of;By each lithium ion battery, under the second discharge current multiplying power, constant-current discharge, to medium voltage, records the second discharge capacity;Short time pulse charge and pulsed discharge are carried out to each lithium ion battery;Each lithium ion battery is continued constant-current discharge to blanking voltage under the second discharge current multiplying power, record the 3rd discharge capacity;And multiple lithium ion batteries are sorted according to first, second, and third discharge capacity.The efficiency of sorting and combo is the method increased, is saved time and cost;The concordance of lithium ion battery combo is improved simultaneously, so as to improve applicable performance and the life-span of set of cells.

Description

Lithium ion battery method for separating
Technical field
The invention belongs to cell art, and in particular to a kind of lithium ion battery method for separating.
Background technology
At present, lithium ion battery combo continues to use the sorting process of conditional electronic product substantially, i.e., will in the battery partial volume stage Then battery cell constant-current constant-voltage charging is discharged to blanking voltage to blanking voltage and cut-off current, measures the quiet of battery cell State capacity, discharge-rate are generally 1C or 0.5C.Then using static capacity as main sorting parameter, AC internal Resistance instrument is measured 1KHz AC internal Resistances as reference parameter, close to capacity and internal resistance is made into one group.Conventional lithium ion battery sorting process At least suffer from the drawback that:(1)The static capacity static capacity actual with set of cells is not inconsistent, because set of cells constant pressure ability is very Weak, the static capacity that the discharge capacity after battery cell constant-voltage charge really can not reflect after combo;(2)Partial volume electric current too little with There is no discrimination as capacity;(3)The difference of storage capacity between monomer is not accounted for;(4)AC-AC internal resistance is very unstable, very The quality of difficult reflection battery;(5)By the combo successively that capacity and internal resistance are close to can expend substantial amounts of manpower, equipment and time into This, and the discordance between set of cells can be aggravated.
Content of the invention
It is contemplated that at least solving one of technical problem present in prior art.
For this purpose, it is an object of the invention to proposing a kind of good lithium ion battery method for separating of separation results concordance.
To achieve these goals, lithium ion battery method for separating according to an embodiment of the invention, can include following Step:A. multiple lithium ion batteries are charged respectively to being full of;B. multiple lithium ion batteries are carried out respectively charged Keep;C. by each described lithium ion battery, under the first discharge current multiplying power, constant-current discharge, to discharge cut-off voltage, records this When each lithium ion battery discharge capacity be the first discharge capacity C1;D. to lithium ion battery constant-current charge each described To blanking voltage and then constant-voltage charge to cut-off current;E. each described lithium ion battery is permanent under the second discharge current multiplying power Stream is discharged to medium voltage, and the discharge capacity for recording now each lithium ion battery is the second discharge capacity C2;F. to each The individual lithium ion battery carries out pulse charge and pulsed discharge, the pulse charge and pulse under pulse charging current multiplying power The time of electric discharge is equal;G., each described lithium ion battery is continued constant-current discharge to ending electricity under the second discharge current multiplying power Pressure, records the 3rd discharge capacity C3 of each lithium ion battery;And H. is put according to first discharge capacity C1, second Capacitance C2 is sorted to the plurality of lithium ion battery with the 3rd discharge capacity C3.
Lithium ion battery method for separating according to embodiments of the present invention, at least has the advantages that:
1. the method for the present invention establishes a set of normal process, and technical scheme integrity is good, and operability is good, it is possible to increase Lithium ion battery sorting and the efficiency of combo, save manpower, equipment and time cost;
2. the method for the present invention includes various battery behavior combo parameter detecting, while consider that multiple parameters are sorted, Multiple batteries are more comprehensively compared, the concordance of lithium ion battery combo is improved, so as to improve being suitable for for set of cells Performance and life-span;
3. the calendar relaxation phenomenon of battery capacity has been taken into full account with pool-size, therefore using the capacity after charged holding As normal capacity, be conducive to the concordance for improving the calendar decay that set of cells is used.
In addition, lithium ion battery method for separating according to embodiments of the present invention can also have following additional technical feature:
In one embodiment of the invention, step H is specifically included:H1. the plurality of lithium ion battery is calculated Meansigma methodss C1a and mean square deviation C1s of the first discharge capacity C1, if C1s/C1a is less than the first predetermined threshold value, then it is assumed that the batch The plurality of lithium ion battery qualified, enter step H2;If H2. satisfaction (the C1a-C1)/C1a of the lithium ion battery is big In the second predetermined threshold value, then it is assumed that be combo defective work, the lithium ion battery is screened out;And H3. calculates each lithium Second discharge capacity of ion battery and the 3rd discharge capacity sum C=(C2+C3), and calculate the plurality of lithium ion battery The C meansigma methodss Ca, if satisfaction (the Ca-C)/Ca of the lithium ion battery be more than the 3rd predetermined threshold value, then it is assumed that be Combo defective work, screens out the lithium ion battery.
In one embodiment of the invention, step A is specifically included:Constant current is carried out respectively to multiple lithium ion batteries Charge to charge cutoff voltage.Set of cells is considered when matching somebody with somebody pool-size in the method for the embodiment to charge in application process approximately The characteristics of without constant pressure, multiple batteries are sorted as normal capacity by the use of lack perseverance pressure-volume amount, can fully ensure that battery exists Capacity uniformity in set of cells.
In one embodiment of the invention, the process of the charged holding includes:Select between low temperature and high temperature many Individual temperature spot is circulated, and the plurality of lithium ion battery is stood a period of time in each temperature spot.By lithium ion battery Storage condition temperature carries out temperature cycles between low temperature, room temperature, high temperature, it is therefore an objective to detect toleration of each battery to temperature. In the embodiment, using multiple temperature spot circulation impacts during charged holding, when being conducive to eliminating set of cells use, temperature is rushed Hit the discordance for causing.
In one embodiment of the invention, the time span of the pulse charge and pulsed discharge is less than 1min.Pulse Charge and the time of pulsed discharge is unsuitable oversize, oversize the charging capacity of battery may be impacted.
In one embodiment of the invention, also include step after step G:Permanent to lithium ion battery each described Current charge is to blanking voltage and then constant-voltage charge to cut-off current.This step is charged to battery to being full of for last time, Battery after being full of can be directly entered next assembling link after sorting or sale is dispatched from the factory.
In one embodiment of the invention, described when carrying out short time pulse charge, also include step:Calculate and charge directly Stream internal resistance Rc;And after step H, also include step:Calculate in the DC charging of the plurality of lithium ion battery Meansigma methodss Rca of resistance Rc, if satisfaction | Rca-Rc |/Rca of the lithium ion battery is more than the 4th predetermined threshold value, then it is assumed that be Combo defective work, screens out the lithium ion battery.In the embodiment, a sorting Consideration is set up, assorting room is more Comprehensively, the result of battery group is more reliable, concordance is good.
In one embodiment of the invention, described when carrying out short time pulsed discharge, also include step:Calculate electric discharge straight Stream internal resistance Rd;And after step H, also include step:Calculate in the direct-current discharge of the plurality of lithium ion battery Meansigma methodss Rda of resistance Rd, if satisfaction | Rda-Rd |/Rda of the lithium ion battery is more than the 5th predetermined threshold value, then it is assumed that be Combo defective work, screens out the lithium ion battery.In the embodiment, a sorting Consideration is set up, assorting room is more Comprehensively, the result of battery group is more reliable, concordance is good.
In one embodiment of the invention, also include step between step A and B:To lithium-ion electric each described Pond carries out first time measurement, to obtain the first AC internal Resistance r1 of each lithium ion battery, and goes back after step H Including step:Meansigma methodss r1a of the first AC internal Resistance r1 of the plurality of lithium ion battery are calculated, if the lithium ion Satisfaction | r1a-r1 |/r1a of battery is more than the 6th predetermined threshold value, then it is assumed that is combo defective work, screens out the lithium-ion electric Pond.In the embodiment, a sorting Consideration is set up, more fully, the result of battery group is more reliable, one for assorting room Cause property is good.Also, in the embodiment, it is that the combo parameter of battery analysis introduces DC internal resistance.In correlation technique, only consideration is handed over Stream internal resistance, and the result of AC internal Resistance detection has very big unstability and randomness.On the contrary, DC internal resistance repeated detection Result there is stability, conforming feature, and set of cells using when high rate performance determined by DC internal resistance.Cause This introduces the accuracy that DC internal resistance is conducive to improving lithium ion battery combo in combo parameter.
In one embodiment of the invention, also include step between step B and C:To lithium-ion electric each described Pond carries out second measurement, to obtain the second AC internal Resistance r2 of each lithium ion battery, and goes back after step H Including step:Meansigma methodss r2a of the second AC internal Resistance r2 of the plurality of lithium ion battery are calculated, if the lithium ion Satisfaction | r2a-r2 |/r2a of battery is more than the 7th predetermined threshold value, then it is assumed that is combo defective work, screens out the lithium-ion electric Pond.In the embodiment, a sorting Consideration is set up, more fully, the result of battery group is more reliable, one for assorting room Cause property is good.Also, in the embodiment, it is that the combo parameter of battery analysis introduces DC internal resistance.In correlation technique, only consideration is handed over Stream internal resistance, and the result of AC internal Resistance detection has very big unstability and randomness.On the contrary, DC internal resistance repeated detection Result there is stability, conforming feature, and set of cells using when high rate performance determined by DC internal resistance.Cause This introduces the accuracy that DC internal resistance is conducive to improving lithium ion battery combo in combo parameter.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become from the following description Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the description with reference to accompanying drawings below to embodiment Substantially and easy to understand, wherein:
Fig. 1 is the schematic flow sheet of the lithium ion battery method for separating of one embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
It is contemplated that proposing a kind of lithium ion battery method for separating, the method has taken into full account set of cells approximately without constant pressure The parameters such as the capacity characteristic of charging, high rate charge-discharge adaptability, storage capacity difference, temperature stress characteristic, DC internal resistance, energy To sorting battery without differences combo, the concordance of set of cells can be improved, combo efficiency can be improved again.
As shown in figure 1, lithium ion battery method for separating according to embodiments of the present invention, may comprise steps of:
A. multiple lithium ion batteries are charged respectively to being full of.
B. charged holding is carried out respectively to multiple lithium ion batteries.
C. by each lithium ion battery, under the first discharge current multiplying power, constant-current discharge, to discharge cut-off voltage, is recorded now The discharge capacity of each lithium ion battery is the first discharge capacity C1.
D. to each lithium ion battery constant-current charge to blanking voltage and then constant-voltage charge to cut-off current.
E. by each lithium ion battery under the second discharge current multiplying power constant-current discharge to medium voltage, record now each The discharge capacity of lithium ion battery is the second discharge capacity C2.
F. pulse charge and pulsed discharge, pulse charge are carried out to each lithium ion battery under pulse charging current multiplying power Equal with the time of pulsed discharge.
G., each lithium ion battery is continued constant-current discharge to blanking voltage under the second discharge current multiplying power, record each 3rd discharge capacity C3 of lithium ion battery.
H. multiple lithium ion batteries are entered according to the first discharge capacity C1, the second discharge capacity C2 and the 3rd discharge capacity C3 Row sorting.
The lithium ion battery method for separating of the embodiment, at least has the advantages that:
1. the method for the present invention establishes a set of normal process, and technical scheme integrity is good, and operability is good, it is possible to increase Lithium ion battery sorting and the efficiency of combo, save manpower, equipment and time cost;
2. the method for the present invention includes various battery behavior combo parameter detecting, while consider that multiple parameters are sorted, Multiple batteries are more comprehensively compared, the concordance of lithium ion battery combo is improved, so as to improve being suitable for for set of cells Performance and life-span;
3. the calendar relaxation phenomenon of battery capacity has been taken into full account with pool-size, therefore using the capacity after charged holding As normal capacity, be conducive to the concordance for improving the calendar decay that set of cells is used.
In addition, lithium ion battery method for separating according to embodiments of the present invention can also have following additional technical feature:
In one embodiment of the invention, step H is specifically included:
H1. meansigma methodss C1a and mean square deviation C1s of the first discharge capacity C1 of multiple lithium ion batteries are calculated, if C1s/ C1a is less than the first predetermined threshold value, then it is assumed that multiple lithium ion batteries of the batch are qualified, enters step H2.In other words, if should The variance of multiple lithium ion batteries of batch is too big, directly all superseded.
If H2. satisfaction (the C1a-C1)/C1a of lithium ion battery is more than the second predetermined threshold value, then it is assumed that be that combo does not conform to Lattice product, screen out lithium ion battery.In other words, if the C1 of part lithium ion battery is less in the batch, need to screen out the lithium from Sub- battery.
H3. second discharge capacity and the 3rd discharge capacity sum C=of each lithium ion battery are calculated(C2+C3), and count Meansigma methodss Ca of the C of multiple lithium ion batteries are calculated, if the satisfaction of lithium ion battery (Ca-C)/Ca is more than the 3rd predetermined threshold value, Then it is considered combo defective work, screens out lithium ion battery.In other words, if part lithium ion battery in the batch(C2+ C3)Less, need to screen out the lithium ion battery.
In one embodiment of the invention, step A is specifically included:Constant-current charge is carried out respectively to multiple lithium ion batteries To charge cutoff voltage.Set of cells is considered when matching somebody with somebody pool-size in the method for the embodiment to charge in application process approximate lack perseverance The characteristics of pressure, multiple batteries are sorted as normal capacity by the use of lack perseverance pressure-volume amount, battery can be fully ensured that in battery Capacity uniformity in group.
In one embodiment of the invention, the process of charged holding includes:Multiple temperature are selected between low temperature and high temperature Degree point is circulated, and multiple lithium ion batteries are stood a period of time in each temperature spot.Storage condition by lithium ion battery Temperature carries out temperature cycles between low temperature, room temperature, high temperature, it is therefore an objective to detect toleration of each battery to temperature.The embodiment In, using multiple temperature spot circulation impacts during charged holding, be conducive to eliminating set of cells using when temperature shock cause Discordance.
In one embodiment of the invention, the time span of pulse charge and pulsed discharge is less than 1min.Pulse charge Unsuitable with the time of pulsed discharge oversize, oversize the charging capacity of battery may be impacted.
In one embodiment of the invention, also include step after step G:To each lithium ion battery constant-current charge extremely Blanking voltage and then constant-voltage charge are to cut-off current.This step is charged to battery to being full of for last time, after being full of Battery can be directly entered next assembling link after sorting or sale is dispatched from the factory.
In one embodiment of the invention, when carrying out short time pulse charge, also include step:Calculate in charging direct current Resistance Rc;And after step H, also include step:Meansigma methodss Rca of the DC charging internal resistance Rc of multiple lithium ion batteries are calculated, If satisfaction | Rca-Rc |/Rca of lithium ion battery is more than the 4th predetermined threshold value, then it is assumed that is combo defective work, screens out lithium Ion battery.In the embodiment, a sorting Consideration is set up, more fully, the result of battery group is more for assorting room Reliable, concordance is good.
In one embodiment of the invention, when carrying out short time pulsed discharge, also include step:Calculate in electric discharge direct current Resistance Rd;And after step H, also include step:Meansigma methodss Rda of the direct-current discharge internal resistance Rd of multiple lithium ion batteries are calculated, If satisfaction | Rda-Rd |/Rda of lithium ion battery is more than the 5th predetermined threshold value, then it is assumed that is combo defective work, screens out lithium Ion battery.In the embodiment, a sorting Consideration is set up, more fully, the result of battery group is more for assorting room Reliable, concordance is good.
In one embodiment of the invention, also include step between step A and B:Is carried out to each lithium ion battery One-shot measurement, to obtain the first AC internal Resistance r1 of each lithium ion battery, and also includes step after step H:Calculate many Meansigma methodss r1a of the first AC internal Resistance r1 of individual lithium ion battery, if satisfaction | r1a-r1 |/r1a of lithium ion battery is more than 6th predetermined threshold value, then it is assumed that be combo defective work, screen out lithium ion battery.In the embodiment, a sorting consideration is set up Factor, more fully, the result of battery group is more reliable, concordance is good for assorting room.Also, in the embodiment, it is battery The combo parameter of analysis introduces DC internal resistance.AC internal Resistance is only considered in correlation technique, and the result of AC internal Resistance detection has There are very big unstability and randomness.On the contrary, the result of DC internal resistance repeated detection has stability, conforming spy Point, and set of cells using when high rate performance determined by DC internal resistance.Therefore introducing DC internal resistance in combo parameter has Beneficial to the accuracy for improving lithium ion battery combo.
In one embodiment of the invention, also include step between step B and C:Is carried out to each lithium ion battery Double measurement, to obtain the second AC internal Resistance r2 of each lithium ion battery, and also includes step after step H:Calculate many Meansigma methodss r2a of the second AC internal Resistance r2 of individual lithium ion battery, if satisfaction | r2a-r2 |/r2a of lithium ion battery is more than 7th predetermined threshold value, then it is assumed that be combo defective work, screen out lithium ion battery.In the embodiment, a sorting consideration is set up Factor, more fully, the result of battery group is more reliable, concordance is good for assorting room.Also, in the embodiment, it is battery The combo parameter of analysis introduces DC internal resistance.AC internal Resistance is only considered in correlation technique, and the result of AC internal Resistance detection has There are very big unstability and randomness.On the contrary, the result of DC internal resistance repeated detection has stability, conforming spy Point, and set of cells using when high rate performance determined by DC internal resistance.Therefore introducing DC internal resistance in combo parameter has Beneficial to the accuracy for improving lithium ion battery combo.
It should be noted that the essence of above-mentioned lithium ion battery sorting schemes is, " the various indexs of test, screen out capacity and refer to The too small lithium ion battery of mark, and screen out the excessive lithium ion battery of various resistance indicator deviations ".All indexs can be adopted Sorted as standard, it is also possible to sorted as standard only with part index number.Entered as standard using multiple indexs During row sorting, order therein can be adjusted flexibly, and can not affect the original of the present invention first or simultaneously to carry out successively, afterwards Reason.
For making those skilled in the art more fully understand the present invention, the lithium ion of one specific embodiment of statement is continued with Battery sorting method.
Step(1):Constant-current charge
First by test cabinet on each lithium ion battery, open circuit stands a period of time(General more than 30 minutes)Reach temperature And electrochemical equilibrium, then with certain current ratio(Below general 5 multiplying power)Constant current charge is to upper limit blanking voltage(According to not Different with lithium ion battery material system producer regulation), finally stand certain time(Within general 30 minutes)Under lower cabinet is waited One process steps.
Step(2):First time AC internal Resistance is measured
Step(1)After end in certain time(Within general 1 hour), with Ac internal resistance instrument(1kHz)Measure all lithium ions The AC internal Resistance r1 of battery is simultaneously recorded.
Step(3):Charged holding
Step(2)After end in certain time(Within general 1 hour), by lithium ion battery in low temperature(Typically -5 DEG C with On)And high temperature(General less than 45 DEG C)Between carry out temperature cycles and shelve(It is general 7 days to shelve the time, typically select low temperature, room temperature, 3 to 5 temperature spots of high temperature are circulated, and each temperature spot shelves the time 1 to 2 days.Final step to shelve ambient temperature best It is room temperature, is conducive to the electrochemical equilibrium for reaching lithium ion battery to carry out next step test).
Step(4):Second AC internal Resistance measurement
Step(3)After end in certain time(Within general 1 hour), with Ac internal resistance instrument(1kHz)Measure all lithium ions The AC internal Resistance r2 of battery is simultaneously recorded.
Step(5):Combo parameter measurement
Step(4)After end in certain time(Within general 1 hour), lithium ion battery Over-The-Counter carries out volume test, has Body is as follows.
Step(5.1):Lithium ion battery stands certain time(Within general 30 minutes);Then with certain multiplying power(Typically Below 10C multiplying powers)Constant current discharge is different according to different lithium ion battery material system producers regulation to discharge cut-off voltage), Record discharge capacity C1.
Step(5.2):Stand certain time(Within general 30 minutes).
Step(5.3):With certain current ratio(Within general 5C multiplying powers)Constant current charge is to step(1)Identical charges Blanking voltage, then constant voltage charges to cut-off current(General more than 0.02C).
Step(5.4):Stand certain time(Within general 30 minutes).
Step(5.5):With certain multiplying power(General 1C multiplying powers)Constant current discharge is to certain medium voltage middle(Generally correspond to The voltage of 30%~70%SOC), record discharge capacity C2.
Step(5.6):Stand certain time(Within general 30 minutes).
Step(5.7):With certain multiplying power pulse charge(General 10 seconds, 10C), calculate charging DC internal resistance Rc;Then quiet Put certain time(Within general 1 minute), finally with certain multiplying power pulsed discharge(General 10 seconds, 10C), calculate in electric discharge direct current Resistance Rd.
Step(5.8):Stand certain time(Within general 5 minutes).
Step(5.9):With step(5.5)Identical multiplying power constant current discharge records discharge capacity to discharge cut-off voltage C3.
Step(5.10):Stand certain time(Within general 5 minutes).
Step(5.11):With certain current ratio(Within general 5C multiplying powers)Constant current charge is to step(1)Identical is filled Electric blanking voltage, then constant voltage charges to cut-off current(General more than 0.02C).
Step(5.12):Stand certain time(Within general 5 minutes).
Step(6):Sort for lithium ion battery.
Step(6.1):C1 values sort and seek meansigma methodss C1a and mean square deviation C1s of C1 by measure.If C1s/C1a is less than The value of certain regulation(Within general 10%), then it is assumed that the batch lithium ion battery is qualified, so as to carry out following sortings.
Step(6.2):C1 values sequence by measure, if (C1a-C1)/C1a is more than certain setting(Within general 5%), Then the lithium ion battery of the capacity is excluded, it is believed that be combo defective work.
Step(6.3):C=(C2+C3) value sequence by measure, and meansigma methodss Ca of C are sought, if (Ca-C)/Ca is more than certain Setting(Within general 5%), then the lithium ion battery of the capacity is excluded, it is believed that be combo defective work.
Step(6.4):Sort and the Rda that averages by direct-current discharge internal resistance Rd values, if the value of | Rda-Rd |/Rda is big In certain setting(Within general 10%), then by should direct-current discharge internal resistance lithium ion battery exclude.
Step(6.5):Sort and the Rca that averages by DC charging internal resistance Rc values, if the value of | Rca-Rc |/Rca is big In certain setting(Within general 10%), then by should direct-current discharge internal resistance lithium ion battery exclude.
Step(6.6):Sort and the r1a that averages by the first AC internal Resistance r1 values, if the value of | r1a-r1 |/r1a is big In certain setting(Within general 15%), then by should direct-current discharge internal resistance lithium ion battery exclude.
Step(6.7):Sort and the r2a that averages by the second AC internal Resistance r2 values, if the value of | r2a-r2 |/r2a is big In certain setting(Within general 15%), then by should direct-current discharge internal resistance lithium ion battery exclude.
Step(6.8):Remaining lithium ion battery is sorted through previous step and is regarded as combo certified products, these lithiums from Sub- battery no longer makes a distinction, and randomly selects lithium ion battery and carries out lithium ionic cell module and match somebody with somebody from these lithium ion batteries Group.
From the foregoing, it will be observed that the lithium ion battery method for separating of the embodiment at utmost increases the collaboration effect of parameters investigation Really so that the spec battery concordance for sorting out is good.Standard compliant lithium ion battery is not repartitioned, can in application process Used with any combo, substantial amounts of combo time and manpower can be saved.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include one or more this feature.In describing the invention, " multiple " are meant that two or more, Unless otherwise expressly limited specifically.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy described with reference to the embodiment or example Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office Combined in one or more embodiments or example in an appropriate manner.Additionally, those skilled in the art can be by this specification Described in different embodiments or example be combined and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (10)

1. a kind of lithium ion battery method for separating, it is characterised in that comprise the following steps:
A. multiple lithium ion batteries are charged respectively to being full of;
B. charged holding is carried out respectively to multiple lithium ion batteries;
C. by each described lithium ion battery, under the first discharge current multiplying power, constant-current discharge, to discharge cut-off voltage, is recorded now The discharge capacity of each lithium ion battery is the first discharge capacity C1;
D. to lithium ion battery constant-current charge each described to blanking voltage and then constant-voltage charge to cut-off current;
E. by each described lithium ion battery under the second discharge current multiplying power constant-current discharge to medium voltage, record now each The discharge capacity of the lithium ion battery is the second discharge capacity C2;
F. pulse charge and pulsed discharge, the pulse are carried out to lithium ion battery each described under pulse charging current multiplying power Charge and the time of pulsed discharge is equal;
G., each described lithium ion battery is continued constant-current discharge to blanking voltage under the second discharge current multiplying power, record each 3rd discharge capacity C3 of the lithium ion battery;And
H. according to first discharge capacity C1, the second discharge capacity C2 and the 3rd discharge capacity C3 to the plurality of lithium-ion electric Pond is sorted.
2. lithium ion battery method for separating according to claim 1, it is characterised in that step H is specifically included:
H1. meansigma methodss C1a and mean square deviation C1s of the first discharge capacity C1 of the plurality of lithium ion battery are calculated, if C1s/ C1a is less than the first predetermined threshold value, then it is assumed that the plurality of lithium ion battery of respective batch is qualified, enters step H2;
If H2. the lithium ion battery meets (C1a-C1)/C1a more than the second predetermined threshold value, then it is assumed that be that combo is unqualified Product, screen out the lithium ion battery;And
H3. second discharge capacity and the 3rd discharge capacity sum C=(C2+C3) of each lithium ion battery are calculated, and Meansigma methodss Ca of the C of the plurality of lithium ion battery are calculated, if the lithium ion battery meets (Ca-C)/Ca more than the Three predetermined threshold values, then it is assumed that be combo defective work, screen out the lithium ion battery.
3. lithium ion battery method for separating according to claim 1, it is characterised in that step A is specifically included:To many Individual lithium ion battery carries out constant-current charge respectively to charge cutoff voltage.
4. lithium ion battery method for separating according to claim 1, it is characterised in that the process bag of the charged holding Include:Between low temperature and high temperature, select multiple temperature spots to be circulated, the plurality of lithium ion battery is quiet in each temperature spot Put a period of time.
5. lithium ion battery method for separating according to claim 1, it is characterised in that the pulse charge and pulsed discharge Time span be less than 1min.
6. lithium ion battery method for separating according to claim 1, it is characterised in that also include walking after step G Suddenly:To lithium ion battery constant-current charge each described to blanking voltage and then constant-voltage charge to cut-off current.
7. the lithium ion battery method for separating according to any one of claim 1-6, it is characterised in that
Described when carrying out pulse charge, also include step:Calculate charging DC internal resistance Rc;And
After step H, also include step:Calculate the plurality of lithium ion battery charging DC internal resistance Rc average Value Rca, if the lithium ion battery meets | Rca-Rc |/Rca and is more than the 4th predetermined threshold value, then it is assumed that be that combo is unqualified Product, screen out the lithium ion battery.
8. the lithium ion battery method for separating according to any one of claim 1-6, it is characterised in that
Described when carrying out pulsed discharge, also include step:Calculate electric discharge DC internal resistance Rd;And
After step H, also include step:Calculate the plurality of lithium ion battery electric discharge DC internal resistance Rd average Value Rda, if the lithium ion battery meets | Rda-Rd |/Rda and is more than the 5th predetermined threshold value, then it is assumed that be that combo is unqualified Product, screen out the lithium ion battery.
9. the lithium ion battery method for separating according to any one of claim 1-6, it is characterised in that
Also include step between step A and B:First time measurement is carried out to lithium ion battery each described, to obtain each First AC internal Resistance r1 of the lithium ion battery, and
Also include step after step H:Calculate the plurality of lithium ion battery the first AC internal Resistance r1 average Value r1a, if the lithium ion battery meets | r1a-r1 |/r1a and is more than the 6th predetermined threshold value, then it is assumed that be that combo is unqualified Product, screen out the lithium ion battery.
10. the lithium ion battery method for separating according to any one of claim 1-6, it is characterised in that
Also include step between step B and C:Second measurement is carried out to lithium ion battery each described, to obtain each Second AC internal Resistance r2 of the lithium ion battery, and
Also include step after step H:Calculate the plurality of lithium ion battery the second AC internal Resistance r2 average Value r2a, if the lithium ion battery meets | r2a-r2 |/r2a and is more than the 7th predetermined threshold value, then it is assumed that be that combo is unqualified Product, screen out the lithium ion battery.
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