CN109596992A - A kind of lithium ion battery accelerates the early stage verification method of analysis lithium failure - Google Patents
A kind of lithium ion battery accelerates the early stage verification method of analysis lithium failure Download PDFInfo
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Abstract
The present invention relates to field of batteries, provide a kind of early stage verification method that lithium ion battery accelerates analysis lithium to fail.This method comprises: carrying out multiple charge and discharge cycles processing to mesuring battary at different temperatures；First concentration of the object ion being precipitated in detection mesuring battary；Based on the first concentration and the second concentration, the analysis lithium characteristic of mesuring battary is predicted, wherein the second concentration is the concentration that battery identical with mesuring battary carries out precipitation object ion after multiple charge and discharge cycles processing under preset steady temperature.By carrying out multiple charge and discharge cycles processing to mesuring battary at different temperature, it can speed up the precipitation of the object ion of mesuring battary, thus it solves the problems, such as to make object ion precipitation very time-consuming when carrying out charge and discharge cycles using single temperature in the prior art, and makes the precipitation of object ion more obvious.In addition, by introducing the prediction course quantization of battery analysis lithium characteristic can be made as the second concentration contrasted and more referring to property and reasonability.
Description
Technical field
The present invention relates to power battery fields, accelerate the early stage of analysis lithium failure in particular to a kind of lithium ion battery
Verification method.
Background technique
Lithium ion battery is produced because it has many advantages, such as that energy density is high, has extended cycle life, Environmental Safety in consumer electronics
Product field and power source industry are widely used.Lithium ion is when low temperature charges, high magnification charges or overcharge, electricity
It can cause biggish polarization inside pond, easily cause battery analysis lithium, vicious circle occurs in long-term charge and discharge process, it can shape
At Li dendrite, diaphragm is pierced through, core micro-short circuit or short circuit is caused, the security performance of battery is caused great harm.
Currently, prediction lithium ion battery is by single battery sample in the most common method of use process analysis lithium possibility
Long-term circulation or circulation at the specified temperature, then disassembled by battery, to determine whether there are the precipitations of lithium metal.The party
Method mainly has following two points insufficient: first is that taking a long time, and not necessarily sending out after long-time recycles at such a temperature
The precipitation of existing Li dendrite；Second is that the state and degree to analysis lithium there is no the index of comparison or quantization.Therefore, lithium ion is predicted at present
The method of the analysis lithium possibility of battery is difficult to carry out the case where analysing lithium ion battery in use lithium quick and reasonable
Prediction.
Summary of the invention
The application provides a kind of early stage verification method that lithium ion battery accelerates analysis lithium to fail, to solve current prediction side
Method is difficult to quickly and rational prediction lithium ion battery the case where analysing lithium in use.In a first aspect, the embodiment of the present application
A kind of early stage verification method that lithium ion battery accelerates analysis lithium to fail is provided, this method comprises: at different temperatures to be measured
Battery carries out multiple charge and discharge cycles processing；First concentration of the object ion being precipitated in detection mesuring battary；It is dense based on first
Degree and the second concentration, predict the analysis lithium characteristic of mesuring battary, wherein the second concentration is battery identical with mesuring battary default
Steady temperature under carry out the concentration that object ion is precipitated after multiple charge and discharge cycles processing.
In the embodiment of the application first aspect, by carrying out multiple charge and discharge to mesuring battary at different temperature
Circular treatment, can speed up the precipitation of the object ion of mesuring battary, thus solves and is using single temperature in the prior art
It carries out making object ion that very time-consuming problem be precipitated when charge and discharge cycles, and makes the precipitation of object ion more obvious.
In addition, by introducing the prediction course quantization of battery analysis lithium characteristic can be made as the second concentration contrasted and more referring to property
And reasonability.
In some optional implementations of first aspect, multiple charge and discharge are carried out to mesuring battary at different temperatures
Circular treatment, comprising: charge and discharge cycles processing is carried out to mesuring battary by the first current density in the first temperature；In second temperature
Charge and discharge cycles processing is carried out to mesuring battary by the second current density；Wherein, second temperature is lower than the first temperature, the second electric current
Density is greater than the first current density.
In this optional embodiment, lithium ion battery provided herein accelerates the early stage authentication of analysis lithium failure
Method uses at the second temperature in such a way that the second current density carries out charge and discharge cycles processing to mesuring battary, wherein the
Two temperature are lower than the first temperature, and the second current density is greater than the first current density, only adopts relative in entire charge and discharge process
For carrying out charge and discharge cycles processing with the first current density, this mode can further increase the target of mesuring battary
Ion releasing degree so that the amount for the object ion being precipitated is enough to be observed and detect, and further shortens
Time needed for entire prediction technique.
In some optional implementations of first aspect, multiple charge and discharge are carried out to mesuring battary at different temperatures
Circular treatment, further includes: charge and discharge cycles processing is carried out to mesuring battary by the second current density at a temperature of third, wherein
Third temperature is higher than the first temperature.
In this optional embodiment, lithium ion battery provided herein accelerates the early stage authentication of analysis lithium failure
Method further uses at a temperature of third in such a way that the second current density carries out charge and discharge cycles processing to mesuring battary,
Wherein, third temperature is higher than the first temperature, and the second current density is greater than the first current density, relative in the first temperature and second
Temperature is respectively adopted for the first current density and the progress charge and discharge cycles processing of the second current density, and this mode can be into one
Degree is precipitated in the object ion for increasing to step mesuring battary, so that the object ion being precipitated is enough to be observed and detect
Out, and further the time needed for shortening entire prediction technique.
In some optional implementations of first aspect, multiple charge and discharge are carried out to mesuring battary at different temperatures
Circular treatment, further includes: when being charged at the second temperature, control mesuring battary is filled by preset ratio excess constant voltage
Electricity.
In this optional embodiment, when being charged at the second temperature less than the first temperature, using will surpass
Degree is precipitated further to increase the object ion of mesuring battary whereby in the mode that the mode of voltage rating charges, from
And the time needed for making the object ion being precipitated be more easily observable and detect and further shorten entire prediction technique.
In some optional implementations of first aspect, the first of the object ion being precipitated in detection mesuring battary
Before concentration, method further include: disassemble mesuring battary under oxygen-free environment, observe the precipitation target of the negative terminal surface of mesuring battary
The case where ion.
In this optional embodiment, by carrying out the dismantling of battery in the environment of anaerobic, battery can reduce
Situation is precipitated in the detection error of experimental result, the object ion by observing mesuring battary negative terminal surface, and tester can be more
Intuitively understand the precipitation situation of object ion.
In some optional implementations of first aspect, in the precipitation object ion feelings of the negative terminal surface of observation battery
On the basis of condition, the analysis lithium characteristic of mesuring battary can be intuitively judged, in this, as a kind of alternative analysis lithium characteristic judgement side
Formula.
In some optional implementations of first aspect, at least one mesuring battary is carried out at different temperatures more
Before secondary charge and discharge cycles processing, this method further include: measure the first internal resistance value of mesuring battary；At different temperatures at least
After one mesuring battary carries out multiple charge and discharge cycles processing, this method further include: the second internal resistance value of mesuring battary is measured,
And the analysis lithium characteristic based on the first internal resistance value and the second internal resistance value prediction mesuring battary.
In this optional embodiment, provides through the internal resistance value before and after comparison charge and discharge cycles and predict that battery is analysed
The mode of lithium characteristic, the variation of battery internal resistance data are able to reflect out the analysis lithium characteristic of battery.This analysis lithium Predicting Performance Characteristics mode
It can be used as another alternative except the first concentration of comparison and the second concentration.
In some optional implementations of first aspect, when predicting the analysis lithium characteristic of mesuring battary, this method is also
Include: the precipitation concentration of the object ion based on each battery, judges the consistency for analysing lithium specificity analysis result.
In this optional embodiment, it is contemplated that the deviation or mistake that single battery experimental result is likely to occur, right
When the analysis lithium characteristic of battery is analyzed, consistency analysis is carried out to the precipitation concentration of multiple batteries, to guarantee the knot of analysis
The analysis lithium characteristic of fruit.
In some optional implementations of first aspect, the second concentration includes multiple concentration values, the number of concentration value
It is identical as the number of different temperatures；Concentration value be with any one of different temperatures be preset steady temperature in the case where,
After carrying out charge and discharge cycles processing to mesuring battary identical with mesuring battary, the concentration of object ion is precipitated in mesuring battary,
One concentration value corresponds to a temperature.
In this optional embodiment, disclose herein as the second concentration for carrying out reference with the first concentration
The corresponding relationship of charge and discharge cycles processing under each concentration value and corresponding temperature.Also, by making a concentration value correspond to one
A temperature, it is ensured that the numerical value sample size of the second concentration as reference is abundant.
In some optional implementations of first aspect, to identical with mesuring battary under preset steady temperature
When battery carries out charge and discharge cycles processing, charge and discharge cycles processing, the first current density are carried out to battery by the first current density
For the nominal current density of battery.
In this optional embodiment, disclose under preset steady temperature to battery identical with mesuring battary into
The current density when processing of row charge and discharge cycles is nominal current density, carries out charge and discharge by setting nominal current density,
The degree for analysing lithium in these charge and discharge process as the battery of reference can be made mainly to be affected by temperature, to be conducive to pre-
As reference when surveying analysis lithium characteristic.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described.It should be appreciated that the following drawings illustrates only certain embodiments of the present invention, therefore it is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the flow chart for the early stage verification method that lithium ion battery provided in an embodiment of the present invention accelerates analysis lithium failure；
Fig. 2 is the flow chart for the early stage verification method that lithium ion battery provided in an embodiment of the present invention accelerates analysis lithium failure；
Fig. 3 is that the battery of Caloric test group provided in an embodiment of the present invention carries out multiple charge and discharge cycles at multiple temperatures
The schematic diagram of processing；
Fig. 4 be charge and discharge cycles provided in an embodiment of the present invention after Caloric test group and three isothermal experiments groups battery
The accounting figure of lithium ion precipitation concentration；
Fig. 5 be charge and discharge cycles provided in an embodiment of the present invention after Caloric test group and three isothermal experiments groups battery
The accounting figure of lithium ion precipitation concentration.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " in ", "upper", "lower", "horizontal", "inner", "outside" etc. refer to
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings or when invention product use usually puts
The orientation or positional relationship put, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.In addition, term " first ", " second " etc. are only used for distinguishing description, it is not understood to indicate or imply relative importance.Again
Person, term "and/or" in the application, only a kind of incidence relation for describing affiliated partner, indicates may exist three kinds of relationships,
For example, A and/or B, can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " setting ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected.It can
To be mechanical connection, it is also possible to be electrically connected.It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements.For the ordinary skill in the art, it can understand that above-mentioned term exists with concrete condition
Concrete meaning in the present invention.
With reference to the accompanying drawing, it elaborates to some embodiments of the present invention.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
In the early stage verification method that lithium ion battery provided by the embodiments of the present application accelerates analysis lithium failure, use such as
The different environment excitation condition such as the temperature of variation to carry out charge and discharge electric treatment to mesuring battary, to accelerate mesuring battary whereby
The precipitation degree of object ion.In addition, making ratio by the first concentration and the second concentration as reference that object ion is precipitated
Compared with to realize the analysis lithium characteristic for quantitatively predicting mesuring battary.The method of the embodiment of the present application is able to solve using existing skill
Art predict lithium ion battery use process analyse lithium possibility when take long time, without comparison quantizating index the problem of.
Specifically, Fig. 1 is please referred to, lithium ion battery provided by the present application accelerates the early stage verification method 100 of analysis lithium failure
It include: step S110, step S120, step S130.
Step S110: multiple charge and discharge cycles processing is carried out to mesuring battary at different temperatures.
Step S120: the first concentration of the object ion being precipitated in detection mesuring battary.
Step S130: be based on the first concentration and the second concentration, predict the analysis lithium characteristic of battery, wherein the second concentration be with
The object ion is precipitated after carrying out multiple charge and discharge cycles processing under preset steady temperature in the identical battery of mesuring battary
Concentration.
For the mesuring battary of such as lithium battery, lithium ion battery provided by the embodiments of the present application accelerates the morning of analysis lithium failure
The implementation process of phase verification method 100 is as follows.
Step S110: multiple charge and discharge cycles processing is carried out to mesuring battary at different temperatures.
In this step, step S110 specifically may include step S112 and S114.
S112: multiple identical batteries are divided into Caloric test group and n isothermal experiments group, every group has m battery.Its
In, " identical " mentioned herein refers to that the specification of each mesuring battary is identical, model is identical and identical (the example of service condition
Such as, all it is completely new) and it is in same SOC (state-of-charge).Further, the value of n corresponds to the battery of Caloric test group
Experimental temperature number.In the present embodiment, n=3.In addition, in one embodiment, the value of SOC 20%, m are 2,
In another embodiment, SOC 30%, m 3, in another embodiment, SOC 25%, m 4.
Optionally, in various embodiments, in step S112, also the internal resistance value of each mesuring battary is tested
And recorded and (be denoted as the first internal resistance value), to be compared with the internal resistance for completing charge and discharge cycles treated battery and from interior
The angle of resistive carries out analysis lithium specificity analysis.
S114: charge and discharge electric treatment is carried out to the battery of Caloric test group under the conditions of the temperature of variation, in stationary temperature
Under to each isothermal experiments group carry out charge and discharge electric treatment.
Temperature used by Caloric test group includes the first temperature and second temperature, wherein the first temperature is higher than the second temperature
Degree.In various embodiments, in order to which the degree that object ion is precipitated is more obvious, Caloric test group is additionally used higher than first
The third temperature of temperature or the 4th temperature less than the first temperature.Specifically, in one embodiment, the first temperature is 25 DEG C,
Second temperature is -10 DEG C, and third temperature is 45 DEG C.In another embodiment, the first temperature is 25 DEG C, and second temperature is -10 DEG C,
Third temperature is 60 DEG C, and the 4th temperature is -20 DEG C.In another embodiment, the first temperature is 25 DEG C, and second temperature is -10 DEG C,
Third temperature is 60 DEG C, and the 4th temperature is -20 DEG C.
Correspondingly, the quantity of isothermal experiments group can be equal to the number for the temperature that Caloric test group uses.Each constant temperature is real
It tests temperature used by group and corresponds to temperature used by a Caloric test group.For example, when the temperature of Caloric test group use
When for the first temperature and second temperature, the quantity of isothermal experiments group is 2, wherein an isothermal experiments group at the first temperature into
Row charge and discharge cycles, another isothermal experiments group carry out charge and discharge cycles at the second temperature.For another example, when Caloric test group uses
Temperature be the first temperature, second temperature and when third temperature, the quantity of isothermal experiments group is 3, wherein an isothermal experiments group
Charge and discharge cycles are carried out at the first temperature, another isothermal experiments group carries out charge and discharge cycles at the second temperature, last
A isothermal experiments group carries out charge and discharge cycles at a temperature of third.Although the quantity of isothermal experiments group illustrated above is equal to alternating temperature
The number of temperature used by experimental group, it will be appreciated that those skilled in the art that the quantity of isothermal experiments group can be with
Less than the number of temperature used by Caloric test group.
In the embodiment of the present application, the mode that charging process is chosen to be first constant current constant pressure again carries out.Carrying out charge and discharge
When circulation, same number is carried out to each mesuring battary of each experimental group including Caloric test group and isothermal experiments group
Charge and discharge cycles processing.In one embodiment, as shown in figure 3, to each battery in Caloric test group in the first temperature
The lower charge and discharge cycles for carrying out 3 periods, then carry out the charge and discharge cycles in 5 periods at a temperature of third, next the
The charge and discharge cycles that 5 periods are carried out at a temperature of two, then carry out the charge and discharge cycles in 5 periods, finally at a temperature of the 4th
The charge and discharge cycles processing for carrying out 3 periods at the first temperature, in this embodiment, has carried out the charge and discharge in 21 periods in total
Electricity circulation.Correspondingly, in this embodiment, four isothermal experiments groups are provided with, each isothermal experiments group carries out 21 periods
Charge and discharge cycles.
In addition, in order to further speed up the precipitation of the object ion of the mesuring battary of Caloric test group, to Caloric test
When the mesuring battary of group carries out charge and discharge cycles processing, control mesuring battary is filled at the first temperature with the first current density
Electric discharge, (for example, second temperature, third temperature and the 4th temperature etc.) carries out charge and discharge at a temperature of other of non-first temperature
When circulation, mesuring battary is controlled with the second current density and carries out charge and discharge, it is close that the first current density is less than or equal to the second electric current
Degree.In various embodiments, the first current density is nominal current density.In one embodiment, the first current density is
0.2C, the second current density are 1C.In another embodiment, the first current density is 0.2C, and the second current density is 0.5C.
For carrying out charge and discharge cycles processing only with the first current density in entire charge and discharge process, this mode can
Degree is precipitated in the object ion for further increasing mesuring battary, so that the object ion being precipitated is enough observed and examines
It measures, and is conducive to the time needed for shortening entire prediction technique.
Correspondingly, the battery of each isothermal experiments group be all made of the first current density carry out charge and discharge cycles, first
Current density is the nominal current density of battery.Charge and discharge are carried out by setting nominal current density, these conducts can be made
The degree of the analysis lithium of the isothermal experiments group battery of reference is mainly affected by temperature, to be conducive to it when lithium characteristic is analysed in prediction
As reference.
Further, in order to which the mesuring battary for accelerating Caloric test group is precipitated to measured ion, in the temperature for being lower than the first temperature
When carrying out charge and discharge cycles processing under degree, used charging voltage is all larger than voltage rating.In various embodiments, second
When being charged at a temperature of temperature and the 4th, control mesuring battary charges by preset ratio excess constant voltage, which can
Think, for example, 2%, 3% or 4%.Less than the first temperature at a temperature of charged when, by using excess is determined electricity
Degree is precipitated in the mode that the mode of pressure charges, the object ion that can further increase mesuring battary, so as to shorten
Time needed for entire prediction technique.
It should be noted that the state-of-charge of each mesuring battary is identical, at one after the completion of the charge and discharge cycles processing of the application
In embodiment, SOC 20%, in another embodiment, SOC 30%.
Step S120: the first concentration of the object ion being precipitated in detection mesuring battary.
Specifically, step S120 may include step S122, S124 and S126:.
Step S122: to each mesuring battary in the Caloric test group and isothermal experiments group for completing charge and discharge cycles processing
It carries out inner walkway and records and (be denoted as the second internal resistance value).
Step S124: disassembling each mesuring battary under oxygen-free environment, observes and records the cathode table of each mesuring battary
The precipitation situation for the lithium ion that face is precipitated.
Specifically, in this application, mesuring battary can be disassembled in glove box, glove box is optionally indifferent gas
Body glove box or vacuum glove box etc..When mesuring battary is lithium battery, the perimeter of battery roll core can be taken and to alternating temperature
The cathode analysis lithium situation of each battery of experimental group and isothermal experiments group is recorded (in the form of image or text etc.), for
Analysis lithium specificity analysis is finally carried out to use.The dismantling that battery is carried out in the environment of anaerobic, can reduce the experimental result of battery
Detection error, by observe mesuring battary negative terminal surface object ion be precipitated situation, tester can more intuitively
Solve the precipitation situation of object ion.
Step S126: the first concentration and the second concentration for the object ion being precipitated in detection mesuring battary.
And then step S124 takes the detection for carrying out lithium concentration along region in core in step S126.Its
In, the concentration that the lithium ion of the battery of Caloric test group is precipitated is the first concentration, and concentration is precipitated in the lithium ion in isothermal experiments group
It is referred to as the second concentration, the second concentration includes multiple concentration values, and each concentration value can correspond to the battery of an isothermal experiments group
Lithium ion be precipitated concentration.From the foregoing, it can be understood that the number of isothermal experiments group can correspond to temperature used by Caloric test group
Number, therefore, the number of the concentration value of the second concentration can be identical as the number of different temperatures.By keeping a concentration value corresponding
In a temperature, it ensure that the numerical value sample size of the second concentration as reference is abundant.
In one embodiment, it takes a battery of Caloric test group as sample 1, takes and tested at the first temperature
A battery of isothermal experiments group be sample 2, take the battery of the isothermal experiments group tested at the second temperature to be
Sample 3, taking a battery of the isothermal experiments group tested at a temperature of third is sample 4, obtains inspection as shown in Figure 3
Survey result, wherein the first concentration be 0.14, the concentration value that the second concentration includes be 0.03 (sample 2), 0.06 (sample 3) and
0.95 (sample 4).
Step S130: it is based on the first concentration and the second concentration, predicts the analysis lithium characteristic of battery.
When carrying out the prediction of ion releasing possibility of battery, battery analysis lithium characteristic prediction method provided by the present application is adopted
It is carried out with by method that the first concentration is compared with one or more concentration values in the second concentration.Specifically, one
In a embodiment, the first temperature is 25 DEG C chosen, and second temperature is chosen to be -10 DEG C, if the first concentration is greater than in second temperature
6 times of the concentration value that the battery of isothermal experiments group after lower carry out charge and discharge cycles measures, it is determined that battery is precipitated in use
A possibility that lithium ion, is big, that is to say, that in battery in use, reliability relevant to analysis lithium characteristic is lower.
In experimental result as shown in Figure 4, the first concentration is 0.19, the isothermal experiments group carried out at the second temperature
The concentration value for the battery analysis lithium that (sample 3) is measured is 0.03, according to above-mentioned analysis lithium characteristic decision rule, can determine that the lithium battery exists
It is larger that lithium possibility is analysed when use.The concentration Value Data between isothermal experiments group can also be used to be compared to carry out analysis lithium characteristic
Prediction.For example, in this application, carrying out the battery analysis of the isothermal experiments group of charge and discharge cycles at second temperature (for example, -10 DEG C)
The battery that lithium concentration value is greater than the isothermal experiments group that charge and discharge cycles are carried out under the first temperature (for example, 25 DEG C) analyses lithium concentration value
4 times, it is determined that battery is precipitated that a possibility that lithium ion is big in use, in battery in use, relevant to analysis lithium characteristic
Reliability is lower.
In experimental result as shown in Figure 5, battery that the isothermal experiments group (sample 3) carried out at the second temperature is measured
The concentration value for analysing lithium is 0.095, the concentration value for the battery analysis lithium that the isothermal experiments group (sample 2) carried out at the first temperature is measured
It is 0.02, according to above-mentioned analysis lithium evaluating characteristics rule, can determine that lithium battery analysis lithium possibility is larger.In other some implementations
In example, can also be tested by Comprehensive Correlation the internal resistance value (the first internal resistance value and the second internal resistance value) of each mesuring battary in front and back with
And the internal resistance value between each experimental group come carry out battery analysis lithium characteristic evaluation.When lithium characteristic is analysed in analysis, electricity may also be combined with
The analysis lithium observation result of the negative regions of pond core carries out comprehensive descision.
Further, lithium ion battery provided by the present application accelerates the early stage verification method of analysis lithium failure to utilize each experiment
The experimental result of interior different battery is organized to judge the consistency of analysis lithium specificity analysis.When some battery in an experimental group
When experimental data and the significantly different data of other batteries, deviation, mistake can be whether there is with checking experiment process, or protecting
It demonstrate,proves in the sufficient situation of experiment sample, the experimental data of the battery can be given up.In view of single battery experimental result may go out
Existing deviation or mistake has carried out consistency to the precipitation concentration of multiple batteries when the analysis lithium characteristic to battery is analyzed
Analysis, ensures that the reliability of the result of analysis.
It should be understood that although disclosure above shows the acquisition process of the second concentration in the form of embodiment,
But the second concentration is also possible to just known before the experiment for measuring the first concentration, acquisition process can be similar to above-mentioned
Experimentation, prediction can be obtained by only needing to be compared with the second concentration known before experiment using the first concentration in prediction
As a result.The disclosure of the acquisition process of second concentration is merely for making those of ordinary skill in the art more clearly know that the application mentions
The lithium ion battery of confession accelerates the early stage verification method of analysis lithium failure and makes, and is not intended to limit the required guarantor of the application
The range of shield in some embodiments of the present application, and does not include the acquisition process of the second concentration.
Lithium ion battery provided by the present application accelerates the early stage verification method of analysis lithium failure by using the temperature, no of variation
The different environment excitation conditions such as same current density to carry out charge and discharge electric treatment to mesuring battary, to accelerate mesuring battary
The precipitation of object ion, to solve in the prior art using the progress charge and discharge cycles prediction object ion at single temperature
Precipitation takes a long time and is precipitated unconspicuous problem.In addition, by the first concentration that object ion is precipitated and as reference
The second concentration make comparisons, thus solve in the prior art predict mesuring battary reliability when without comparison or quantization index
The problem of.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the early stage verification method that a kind of lithium ion battery accelerates analysis lithium failure, which is characterized in that the described method includes:
Multiple charge and discharge cycles processing is carried out to mesuring battary at different temperatures；
Detect the first concentration of the object ion being precipitated in the mesuring battary；
Based on first concentration and the second concentration, the analysis lithium characteristic of the mesuring battary is predicted, wherein second concentration is
The mesh is precipitated after carrying out multiple charge and discharge cycles processing under preset steady temperature in battery identical with the mesuring battary
Mark the concentration of ion.
2. the method according to claim 1, wherein described at different temperatures repeatedly fill mesuring battary
Discharge cycles processing, comprising:
Charge and discharge cycles processing is carried out to the mesuring battary by the first current density in the first temperature；
Charge and discharge cycles processing is carried out to the mesuring battary by the second current density in second temperature；
Wherein, the second temperature is lower than first temperature, and second current density is greater than first current density.
3. according to the method described in claim 2, it is characterized in that, described at different temperatures repeatedly fill mesuring battary
Discharge cycles processing, further includes:
Charge and discharge cycles processing is carried out to the mesuring battary by second current density at a temperature of third, wherein described
Third temperature is higher than first temperature.
4. according to the method described in claim 2, it is characterized in that, described at different temperatures repeatedly fill mesuring battary
Discharge cycles processing, further includes:
When being charged under the second temperature, controls the mesuring battary and charge by preset ratio excess constant voltage.
5. the method according to claim 1, wherein the object ion that is precipitated in detecting the mesuring battary
Before first concentration, the method also includes:
The mesuring battary is disassembled under oxygen-free environment, observes the precipitation target of the negative terminal surface of each mesuring battary
The case where ion.
6. according to the method described in claim 5, it is characterized in that, when predicting the analysis lithium characteristic of the battery, the method
Further include:
The precipitation of negative terminal surface based on the battery the observed object ion situation, judges the analysis of the mesuring battary
Lithium characteristic.
7. the method according to claim 1, wherein repeatedly being filled to the mesuring battary at different temperatures
Before discharge cycles processing, the method also includes:
Measure the first internal resistance value of the mesuring battary；
After carrying out multiple charge and discharge cycles processing to the mesuring battary at different temperatures, the method also includes:
The second internal resistance value of the mesuring battary is measured, and based on described in first internal resistance value and second internal resistance value prediction
The analysis lithium characteristic of mesuring battary.
8. the method according to claim 1, wherein including at least two identical batteries in the mesuring battary
When, when predicting the analysis lithium characteristic of the mesuring battary, the method also includes:
The precipitation concentration of the object ion based on each battery judges the consistency for analysing lithium specificity analysis result.
9. the method according to claim 1, wherein second concentration includes multiple concentration values, a concentration
Value corresponds to a temperature for including in the different temperatures；
One concentration value be with one temperature be the preset steady temperature in the case where, to it is described to be measured
After the identical battery of battery carries out charge and discharge cycles processing, the concentration of the object ion is precipitated in the battery.
10. the method according to claim 1, wherein under preset steady temperature to the mesuring battary
When the identical battery carries out charge and discharge cycles processing, charge and discharge is carried out to the battery by the nominal current density of the battery
Electric circular treatment.
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