CN108398649A - Lithium analysis detection method and device - Google Patents
Lithium analysis detection method and device Download PDFInfo
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- CN108398649A CN108398649A CN201810194583.4A CN201810194583A CN108398649A CN 108398649 A CN108398649 A CN 108398649A CN 201810194583 A CN201810194583 A CN 201810194583A CN 108398649 A CN108398649 A CN 108398649A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 107
- 238000001514 detection method Methods 0.000 title claims abstract description 61
- 238000004458 analytical method Methods 0.000 title claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 52
- 230000008569 process Effects 0.000 claims abstract description 23
- 208000028659 discharge Diseases 0.000 claims description 70
- 230000008021 deposition Effects 0.000 claims description 15
- 238000001556 precipitation Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 11
- 238000010277 constant-current charging Methods 0.000 claims description 10
- 238000010280 constant potential charging Methods 0.000 claims description 4
- 238000003556 assay Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 12
- 238000007600 charging Methods 0.000 description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 18
- 229910001416 lithium ion Inorganic materials 0.000 description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- 229910002804 graphite Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000012031 short term test Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention provides a lithium analysis detection method and device, and relates to the technical field of batteries. In the embodiment of the invention, a voltage signal is acquired in the discharging process of the battery to be detected, then, a discharging curve of the battery to be detected is obtained according to the voltage signal, the discharging curve represents the relation between voltage and discharging duration, so that a voltage fluctuation curve of the battery to be detected is obtained according to the discharging curve, the voltage fluctuation curve represents the relation between the second derivative of electric quantity to voltage and voltage, and further, whether lithium analysis occurs to the battery to be detected is detected according to the voltage fluctuation curve. Therefore, the technical scheme provided by the embodiment of the invention can solve the problems of high manpower and material resource consumption and low detection efficiency of the method for detecting the lithium separation of the battery in the prior art.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a lithium analysis detection method and device.
[ background of the invention ]
Lithium separation is a common abnormal phenomenon in the charging process of the lithium ion battery, and particularly, the lithium separation phenomenon is easy to occur in the large-current charging or the low-temperature charging. The phenomenon of lithium separation occurs in connection with the polarization phenomenon of the lithium ion battery during charging. The equilibrium potential of graphite intercalation is 50-60 mV, the electrode potential is reduced by polarization due to the passage of current during charging, the equilibrium potential for the precipitation of metallic lithium is 0V, and the equilibrium potential is also reduced by polarization during charging, and the phenomenon of lithium precipitation occurs when the potential of graphite intercalation is lower than the electrode potential of lithium. Particularly, in the case of low-temperature and high-rate charging, a large polarization phenomenon is caused, and a lithium precipitation phenomenon is caused. When lithium ion battery takes place to analyse the lithium phenomenon, can lead to electric core performance to descend, simultaneously, the lithium dendrite of appearing is located lithium ion battery's surface, probably can pierce through the battery diaphragm and lead to positive negative pole short circuit, has great potential safety hazard.
At present, a common lithium analysis detection method is generally a mode of disassembling a battery, and whether the lithium ion battery can analyze lithium when being delivered is manually detected. This requires a large amount of manpower and material resources, and has a problem of low detection efficiency.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method and an apparatus for detecting lithium separation, so as to solve the problems of large manpower and material resource consumption and low detection efficiency in the method for detecting lithium separation of a battery in the prior art.
In one aspect, an embodiment of the present invention provides a lithium analysis detection method, including:
collecting a voltage signal in the discharging process of a battery to be detected;
acquiring a discharge curve of the battery to be tested according to the voltage signal, wherein the discharge curve represents the relation between voltage and discharge duration;
acquiring a voltage fluctuation curve of the battery to be tested according to the discharge curve, wherein the voltage fluctuation curve represents the relationship between the second derivative of the electric quantity to the voltage and the voltage;
and detecting whether the lithium analysis occurs to the battery to be detected or not according to the voltage fluctuation curve.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner for detecting whether lithium separation occurs in the battery to be tested according to the voltage fluctuation curve, including:
detecting whether the voltage fluctuation curve has a value less than zero at the initial stage of discharge;
when the voltage fluctuation curve has a value less than zero in the initial discharge stage, detecting that lithium precipitation occurs in the battery to be tested;
and when the voltage fluctuation curve does not have a value less than zero in the initial discharge stage, detecting that no lithium precipitation occurs in the battery to be tested.
The above-described aspect and any possible implementation manner further provide an implementation manner, where the initial discharge stage is a stage where a voltage of the battery to be tested is between a first voltage and a second voltage, the initial discharge voltage of the battery to be tested is between the first voltage and the second voltage, and the first voltage is smaller than the second voltage.
There is further provided in accordance with the above-described aspect and any possible implementation, an implementation in which the first voltage is 3.30V and the second voltage is 3.45V.
The above aspect and any possible implementation manner further provide an implementation manner, where obtaining a voltage fluctuation curve of the battery to be tested according to the discharge curve includes:
acquiring a second derivative of the electric quantity of the battery to be tested at each discharging moment to the voltage at the moment;
and obtaining the voltage fluctuation curve according to the second derivative and the voltage.
The above aspect and any possible implementation manner further provide an implementation manner, before obtaining a voltage fluctuation curve of the battery to be tested according to the discharge curve, the method further includes:
obtaining the current of the battery to be tested in the discharging process;
and acquiring the integral of the current with respect to time to obtain the electric quantity of the battery to be tested at each discharging moment.
The above-described aspect and any possible implementation manner further provide an implementation manner, where before collecting the voltage signal in the discharging process of the battery to be tested, the method further includes:
controlling the battery to be tested to be charged to cut-off voltage;
and controlling the battery to be tested to perform constant current discharge.
The above-described aspect and any possible implementation manner further provide an implementation manner, where before collecting the voltage signal in the discharging process of the battery to be tested, the method further includes:
controlling the battery to be tested to be charged to cut-off voltage;
controlling the standing of the battery to be tested for a specified time;
and controlling the battery to be tested to perform constant current discharge.
The above aspect and any possible implementation manner further provide an implementation manner for controlling the battery to be tested to be charged to a cut-off voltage, including:
controlling the battery to be tested to perform constant current charging; or,
and controlling the battery to be tested to perform constant-current and constant-voltage charging.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, considering that the lithium ion battery is subjected to lithium analysis because the electrode potential is polarized and reduced due to the charging current, and the potential of the graphite embedded lithium is lower than the electrode potential of the lithium, which has great interference on the voltage of the battery in the discharging process of the battery, whether the lithium analysis occurs on the battery can be judged according to the voltage fluctuation condition of the lithium ion battery in the initial discharging stage after charging and discharging, so that whether the lithium analysis occurs on the battery to be detected can be detected by acquiring the voltage fluctuation curve of the battery to be detected. The technical scheme provided by the embodiment of the invention does not need to disassemble the battery, so that the manpower and material resources are saved, the detection efficiency is improved, the requirements on the structure, the temperature, the accuracy of acquisition equipment and the like of the battery are lower, the application range is wide, the flexibility is high, and the problems of higher consumption of manpower and material resources and lower detection efficiency in the detection of the lithium separation of the battery in the prior art can be solved.
In another aspect, an embodiment of the present invention provides a lithium analysis detection apparatus, including:
the acquisition unit is used for acquiring a voltage signal in the discharging process of the battery to be detected;
the first obtaining unit is used for obtaining a discharging curve of the battery to be detected according to the voltage signal, and the discharging curve represents the relation between voltage and discharging duration;
the second acquisition unit is used for acquiring a voltage fluctuation curve of the battery to be detected according to the discharge curve, wherein the voltage fluctuation curve represents the relationship between the second derivative of the electric quantity to the voltage and the voltage;
and the detection unit is used for detecting whether the lithium analysis occurs to the battery to be detected according to the voltage fluctuation curve.
In another aspect, an embodiment of the present invention provides a computer-readable storage medium, including: computer-executable instructions for performing the method of lithium precipitation detection as described in the first aspect when the computer-executable instructions are executed.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, considering that the lithium ion battery is subjected to lithium analysis because the electrode potential is polarized and reduced due to the charging current, and the potential of the graphite embedded lithium is lower than the electrode potential of the lithium, which has great interference on the voltage of the battery in the discharging process of the battery, whether the lithium analysis occurs on the battery can be judged according to the voltage fluctuation condition of the lithium ion battery in the initial discharging stage after charging and discharging, so that whether the lithium analysis occurs on the battery to be detected can be detected by acquiring the voltage fluctuation curve of the battery to be detected. The technical scheme provided by the embodiment of the invention does not need to disassemble the battery, so that the manpower and material resources are saved, the detection efficiency is improved, the requirements on the structure, the temperature, the accuracy of acquisition equipment and the like of the battery are lower, the application range is wide, the flexibility is high, and the problems of higher consumption of manpower and material resources and lower detection efficiency in the detection of the lithium separation of the battery in the prior art can be solved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a lithium analysis detection method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another lithium analysis detection method provided by the embodiment of the invention;
FIG. 3 is a schematic voltage fluctuation curve under an application scenario of the embodiment of the present invention;
FIG. 4 is a schematic voltage fluctuation curve in another application scenario of the embodiment of the present invention;
FIG. 5 is a schematic diagram of a voltage fluctuation curve in another application scenario of the embodiment of the present invention;
FIG. 6 is a schematic diagram of a voltage fluctuation curve in another application scenario of the embodiment of the present invention;
FIG. 7 is a schematic voltage fluctuation curve in another application scenario of the embodiment of the present invention;
FIG. 8 is a schematic voltage fluctuation curve in another application scenario of the embodiment of the present invention;
FIG. 9 is a schematic diagram of a voltage fluctuation curve in another application scenario of the embodiment of the present invention;
fig. 10 is a functional block diagram of a lithium analysis detection device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe voltages, etc. in embodiments of the present invention, these voltages should not be limited to these terms. These terms are only used to distinguish voltages from each other. For example, the first voltage may also be referred to as a second voltage, and similarly, the second voltage may also be referred to as the first voltage, without departing from the scope of embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Aiming at the problems of high manpower and material resource consumption and low detection efficiency in the detection of lithium separation of batteries in the prior art, the embodiment of the invention provides the following solution ideas: the voltage fluctuation abnormity of the battery can be caused after the lithium ion battery generates lithium analysis, and therefore whether the lithium analysis of the battery occurs can be detected based on a voltage fluctuation curve between the second derivative of the electric quantity to the voltage and the voltage.
Under the guidance of this idea, the present embodiment provides the following feasible embodiments.
Example one
The embodiment of the invention provides a lithium analysis detection method, please refer to fig. 1, which includes the following steps:
and S102, acquiring a voltage signal in the discharging process of the battery to be tested.
The battery to be tested according to the embodiment of the invention is a lithium ion battery to be tested.
And, the battery according to the embodiment of the present invention includes, but is not limited to: a solid cell or an equivalent battery module. Among them, the equivalent battery module may include, but is not limited to: the battery module that electric core, or, constitute by a plurality of electric cores, or, the battery package that constitutes by the battery module, or, the energy system who constitutes by a plurality of battery packages.
And S104, acquiring a discharge curve of the battery to be tested according to the voltage signal, wherein the discharge curve represents the relation between the voltage and the discharge duration.
The abscissa of the discharge curve can be the discharge duration, and the ordinate of the discharge curve is the voltage of the battery to be measured in the discharge process.
And S106, acquiring a voltage fluctuation curve of the battery to be tested according to the discharge curve, wherein the voltage fluctuation curve represents the relationship between the second derivative of the electric quantity to the voltage and the voltage.
The abscissa of the voltage fluctuation curve is voltage, and the ordinate of the voltage fluctuation curve is the second derivative of the electric quantity to the voltage.
And S108, detecting whether the lithium is separated from the battery to be detected or not according to the voltage fluctuation curve.
Hereinafter, each of the above steps will be described.
Referring to fig. 2 for the step S106, in practical implementation, this step can be implemented by the following two steps:
s1061, acquiring a second derivative (d (dQ/dV)/dV) of the electric quantity of the battery to be tested at each discharging moment to the voltage at the moment according to the discharging curve;
s1062, obtaining a voltage fluctuation curve (d (dQ/dV)/dV-V) according to the second derivative (d (dQ/dV)/dV) and the voltage (V).
Specifically, before executing S1061, the current in the discharging process of the battery to be tested needs to be obtained, and then, the integral of the current with respect to time is obtained, so as to obtain the electric quantity of the battery to be tested at each discharging time. In an implementation scenario, if the battery to be tested performs constant current discharge, the step of obtaining the current can be directly realized by reading the set constant current discharge value.
After obtaining the electric quantity at each discharge time, a first derivative (dQ/dV) of the electric quantity to the voltage at each discharge time can be obtained, and at this time, the first derivative (dQ/dV) of the electric quantity to the voltage can be used for representing the capacitance value at the discharge time. And then, carrying out second derivation on the first derivative (dQ/dV) of the electric quantity to the voltage and the voltage (V) to obtain a second derivative (d (dQ/dV)/dV) of the electric quantity to the voltage at each discharge moment.
Based on the steps, after the second-order derivative (d (dQ/dV)/dV) of the electric quantity to the voltage at each discharging moment is obtained, the voltage (V) of the battery to be tested is taken as an abscissa, and the second-order derivative (d (dQ/dV)/dV) is taken as an ordinate, so that the voltage fluctuation curve of the battery to be tested is obtained. Fig. 3 to 9 can be referred to as schematic diagrams of the voltage fluctuation curves.
Thereafter, as shown in fig. 2, the detection step of executing S108 is realized by the following implementation:
s1081, detecting whether the voltage fluctuation curve has a value less than zero in the initial stage of discharge.
S1082, when the voltage fluctuation curve has a value less than zero in the initial discharge stage, detecting that lithium precipitation occurs in the battery to be tested.
S1083, when the voltage fluctuation curve does not have a value less than zero in the initial discharge stage, detecting that no lithium precipitation occurs in the battery to be tested.
It is understood that S1082 and S1083 are not performed simultaneously, but are alternatively performed according to the result of performing S1081.
The initial discharge stage is a stage in which the voltage of the battery to be tested is between a first voltage and a second voltage, the initial discharge voltage of the battery to be tested is between the first voltage and the second voltage, and the first voltage is smaller than the second voltage.
It can be understood that the values of the first voltage and the second voltage are related to the initial voltage of the battery to be tested when the battery to be tested starts to perform the discharging process. When the battery under test performs the step of charging to the cut-off voltage before performing the discharging process, the range related to the first voltage and the second voltage should include the cut-off voltage.
Preferably, the first voltage is 3.4V and the second voltage is 3.45V.
And, in a possible implementation scenario, the condition for executing step S102 is that the battery to be tested starts to discharge, and therefore, during the discharging process, the voltage signal of the battery is collected.
Therefore, in one implementation manner in this application scenario, before executing step S102, the following steps may be executed: and controlling the battery to be tested to be charged to the cut-off voltage, and then controlling the battery to be tested to perform constant current discharge.
Alternatively, in another implementation manner in the application scenario, before executing step S102, the following steps may be executed: and controlling the battery to be tested to be charged to a cut-off voltage, then controlling the battery to be tested to stand for a specified time, and then controlling the battery to be tested to perform constant current discharge.
Both the above two implementation manners can be implemented in the application scenario, wherein the too long standing time of the battery to be tested affects the discharge curve obtained in the step S104, and therefore, when the second implementation manner is adopted, the specified time should be controlled to be shorter. For example, the designated standing time can be 0-1 minute to improve the detection accuracy.
In the two implementation scenarios, the method for controlling the charging of the battery to be tested may be: controlling a battery to be tested to perform constant current charging; or controlling the battery to be tested to perform constant-current and constant-voltage charging. The realization mode of controlling the battery to carry out constant current charging can improve the detection precision to a certain extent, and the influence of a constant voltage charging stage on the potential of the battery is avoided.
The cut-off voltage, charge rate, discharge rate, temperature, and the like, which are required for realizing the above embodiment, may be preset as needed. In a preferred embodiment, the temperature range may be: (-30, 60) degrees Celsius; the range of the cutoff voltage may be set to the rated cutoff voltage of the lithium ion battery or any value greater than 3.4V, for example, may be one of (3.4, 3.65) volts; the charging multiplying power can be any value; the range of the discharge rate may be (0.05, 3), because when the discharge rate is less than 0.05, the time period for reaching the discharge termination voltage is too long, which affects the detection efficiency, and when the discharge rate is greater than 3, because the voltage curve has a large polarization, which affects the detection accuracy.
The lithium precipitation detection method provided by the embodiment of the invention has the advantages of wide application range and less requirements on the service condition and the charging condition of the battery. For example, the method is suitable for fresh (unused) lithium ion batteries or lithium ion batteries subjected to short-term test, and is suitable for high-current quick-charging conditions, low-temperature charging conditions and high-temperature cycle conditions.
Hereinafter, a battery to be tested is a fresh lithium iron phosphate battery or a lithium iron phosphate battery subjected to an excessively short-term test, in which a positive electrode active material used by the battery to be tested is lithium iron phosphate, a negative electrode active material is graphite, and voltage fluctuation curves shown in fig. 3 to 9 obtained when an electrolyte is a conventional electrolyte are taken as an example, which will be described.
The first application scenario is as follows: and verifying whether lithium is separated from the fresh battery to be tested or the battery to be tested which is subjected to the short-term test.
The specific scene is as follows: charging a battery to be tested with 2Ah to a cut-off voltage of 3.65V at a constant current of 2A at a temperature of 25 ℃, directly discharging to 2.5V at a current of 1A without standing time after charging, and specifically obtaining a voltage fluctuation curve as shown in figure 3.
At this time, as shown in fig. 3, a value less than 0 does not appear between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, and therefore, the lithium deposition detection method provided by the embodiment of the invention detects that no lithium deposition occurs on the battery to be tested.
Furthermore, the battery to be tested is disassembled, and the fact that the battery to be tested does not have the lithium separation phenomenon is determined, so that the detection result of the scheme is consistent with the fact for the battery to be tested which is fresh or is tested for a short period.
The second application scenario is as follows: and verifying whether lithium is separated from the fresh battery to be tested or the battery to be tested which is subjected to the short-term test.
The specific scene is as follows: charging a battery to be tested with 2Ah to a cut-off voltage of 3.65V at a constant current of 6A at a temperature of 25 ℃, directly discharging to 2.5V at a current of 1A without standing time after charging, and specifically obtaining a voltage fluctuation curve as shown in figure 4.
At this time, as shown in fig. 4, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so that the lithium deposition detection method provided by the embodiment of the invention detects that the lithium deposition occurs on the battery to be tested.
Furthermore, the battery to be tested is disassembled, and the battery to be tested is determined to have a serious lithium precipitation phenomenon, so that the detection result of the scheme is consistent with the fact for the battery to be tested which is fresh or is tested for a short period.
The third application scenario is: and verifying whether lithium separation occurs during the charging of the fresh battery to be tested at low temperature.
The specific scene is as follows: charging a battery to be tested with 2Ah to a cut-off voltage of 3.65V at a constant current of 1A at a temperature of-10 ℃, directly discharging to 2.5V with a current of 1A without standing time after charging, and specifically obtaining a voltage fluctuation curve as shown in figure 5.
At this time, as shown in fig. 5, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so that the lithium deposition detection method provided by the embodiment of the invention detects that the lithium deposition occurs on the battery to be tested.
Furthermore, the battery to be tested is disassembled, and the slight lithium separation phenomenon of the battery to be tested is determined, so that the detection result of the scheme is consistent with the fact in the scene that the fresh battery to be tested is charged at a low temperature.
The fourth application scenario is as follows: and verifying whether the fresh high-capacity steel shell battery to be tested is subjected to lithium separation.
The specific scene is as follows: charging a 200Ah battery to be tested to a cut-off voltage of 3.65V at a constant current of 500A at a temperature of 25 ℃, directly discharging the battery to be tested to 2.5V at a current of 100A without standing time after charging, and specifically obtaining a voltage fluctuation curve as shown in figure 6.
At this time, as shown in fig. 6, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so that the lithium deposition detection method provided by the embodiment of the invention detects that the lithium deposition occurs on the battery to be tested.
Furthermore, the battery to be tested is disassembled, and the battery to be tested is determined to have a serious lithium precipitation phenomenon, so that the detection result of the scheme is consistent with the fact for the fresh battery to be tested with the large-capacity steel shell.
The fifth application scenario is as follows: and verifying whether the battery to be tested in the low-temperature cycle separates lithium.
The specific scene is as follows: performing cycle test on the battery to be tested with 2Ah at the temperature of-10 ℃ at 0.5C/0.5C, wherein each cycle is processed according to the following flow: the current is 1A for constant current charging to the cut-off voltage of 3.65V, the standing time is not needed after charging, and the current of 1A is directly used for discharging to 2.5V. And, processing the discharge curve in each cycle as shown in fig. 1 to obtain a voltage fluctuation curve in each cycle, wherein the voltage fluctuation curve of the battery to be tested in the 10 th cycle is shown in fig. 7.
At this time, as shown in fig. 7, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so the lithium deposition detection method provided by the embodiment of the invention detects that lithium deposition occurs on the battery to be tested at the 10 th cycle.
Furthermore, the battery to be tested is disassembled, and the battery to be tested is determined to have a serious lithium precipitation phenomenon, so that the detection result of the scheme is consistent with the fact for the battery to be tested in low-temperature circulation.
The sixth application scenario is as follows: and verifying whether the battery to be tested in the quick charge cycle separates lithium.
The specific scene is as follows: performing cycle test on the battery to be tested with 2Ah at the temperature of-10 ℃ at 5C/0.5C, wherein each cycle is processed according to the following flow: the current is 10A for constant current charging to the cut-off voltage of 3.65V, the standing time is not needed after charging, and the current of 1A is directly used for discharging to 2.5V. And, processing the discharge curve in each cycle as shown in fig. 1 to obtain a voltage fluctuation curve in each cycle, wherein the voltage fluctuation curve of the battery to be tested in the 50 th cycle is shown in fig. 8.
At this time, as shown in fig. 8, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so the lithium deposition detection method provided by the embodiment of the invention detects that lithium deposition occurs on the battery to be tested at the 50 th cycle.
Furthermore, the battery to be tested is disassembled, and the slight lithium separation phenomenon of the battery to be tested is determined, so that the detection result of the scheme is consistent with the fact for the battery to be tested in the rapid charging cycle.
The seventh application scenario is as follows: and verifying whether the battery to be tested in the high-temperature cycle is subjected to lithium separation.
The specific scene is as follows: carrying out cycle test on the battery to be tested with 2Ah at the temperature of 60 ℃ at the temperature of 5C/0.5C, wherein each cycle is processed according to the following flow: the current is 10A for constant current charging to the cut-off voltage of 3.65V, the standing time is not needed after charging, and the current of 1A is directly used for discharging to 2.5V. And, processing the discharge curve in each cycle as shown in fig. 1 to obtain a voltage fluctuation curve in each cycle, wherein the voltage fluctuation curve of the battery to be tested in the 150 th cycle is shown in fig. 9.
At this time, as shown in fig. 9, a value less than 0 appears between the initial discharge stages (3.30V to 3.45V) of the voltage fluctuation curve, so the lithium deposition detection method provided by the embodiment of the invention detects that lithium deposition occurs on the battery to be tested at the 150 th cycle.
Furthermore, the battery to be tested is disassembled, and the slight lithium precipitation phenomenon of the battery to be tested is determined, so that the detection result of the scheme is consistent with the fact for the battery to be tested in high-temperature circulation.
As can be seen from the lithium analysis detection under the seven application scenarios shown in fig. 3 to 9, the lithium analysis detection method provided in the embodiment of the present invention can accurately detect whether the lithium analysis occurs on the battery to be detected, and the detection requirements on the environment and the battery are low; and even if the slight lithium separation condition that the area of the lithium separated from the battery to be detected is less than 3% of the total anode plate area can be detected, the detection sensitivity is higher.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, considering that the lithium ion battery is subjected to lithium analysis because the electrode potential is polarized and reduced due to the charging current, and the potential of the graphite embedded lithium is lower than the electrode potential of the lithium, which has great interference on the voltage of the battery in the discharging process of the battery, whether the lithium analysis occurs on the battery can be judged according to the voltage fluctuation condition of the lithium ion battery in the initial discharging stage after charging and discharging, so that whether the lithium analysis occurs on the battery to be detected can be detected by acquiring the voltage fluctuation curve of the battery to be detected. The technical scheme provided by the embodiment of the invention does not need to disassemble the battery, so that the manpower and material resources are saved, the detection efficiency is improved, the requirements on the structure, the temperature, the accuracy of acquisition equipment and the like of the battery are lower, the application range is wide, the flexibility is high, and the problems of higher consumption of manpower and material resources and lower detection efficiency in the detection of the lithium separation of the battery in the prior art can be solved.
Example two
Based on the lithium analysis detection method provided in the first embodiment, the embodiment of the present invention further provides an embodiment of an apparatus for implementing each step and method in the above method embodiment.
Referring to fig. 10, which is a functional block diagram of a lithium analysis detection device according to an embodiment of the present invention, the lithium analysis detection device 100 includes:
the acquisition unit 110 is used for acquiring a voltage signal in the discharging process of the battery to be detected;
the first obtaining unit 120 is configured to obtain a discharge curve of the battery to be tested according to the voltage signal, where the discharge curve represents a relationship between voltage and discharge duration;
the second obtaining unit 130 is configured to obtain a voltage fluctuation curve of the battery to be tested according to the discharge curve, where the voltage fluctuation curve represents a relationship between a second derivative of the electric quantity to the voltage and the voltage;
and the detection unit 140 is configured to detect whether lithium is separated from the battery to be tested according to the voltage fluctuation curve.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, including: computer-executable instructions, when executed, for performing the method of detecting lithium by analyzing lithium as described in embodiment one.
Since each unit in the present embodiment can execute the method shown in fig. 1, reference may be made to the related description of fig. 1 for a part of the present embodiment that is not described in detail.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, considering that the lithium ion battery is subjected to lithium analysis because the electrode potential is polarized and reduced due to the charging current, and the potential of the graphite embedded lithium is lower than the electrode potential of the lithium, which has great interference on the voltage of the battery in the discharging process of the battery, whether the lithium analysis occurs on the battery can be judged according to the voltage fluctuation condition of the lithium ion battery in the initial discharging stage after charging and discharging, so that whether the lithium analysis occurs on the battery to be detected can be detected by acquiring the voltage fluctuation curve of the battery to be detected. The technical scheme provided by the embodiment of the invention does not need to disassemble the battery, so that the manpower and material resources are saved, the detection efficiency is improved, the requirements on the structure, the temperature, the accuracy of acquisition equipment and the like of the battery are lower, the application range is wide, the flexibility is high, and the problems of higher consumption of manpower and material resources and lower detection efficiency in the detection of the lithium separation of the battery in the prior art can be solved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of detecting lithium evolution, the method comprising:
collecting a voltage signal in the discharging process of a battery to be detected;
acquiring a discharge curve of the battery to be tested according to the voltage signal, wherein the discharge curve represents the relation between voltage and discharge duration;
acquiring a voltage fluctuation curve of the battery to be tested according to the discharge curve, wherein the voltage fluctuation curve represents the relationship between the second derivative of the electric quantity to the voltage and the voltage;
and detecting whether the lithium analysis occurs to the battery to be detected or not according to the voltage fluctuation curve.
2. The method of claim 1, wherein detecting whether the lithium deposition occurs in the battery to be tested according to the voltage fluctuation curve comprises:
detecting whether the voltage fluctuation curve has a value less than zero at the initial stage of discharge;
when the voltage fluctuation curve has a value less than zero in the initial discharge stage, detecting that lithium precipitation occurs in the battery to be tested;
and when the voltage fluctuation curve does not have a value less than zero in the initial discharge stage, detecting that no lithium precipitation occurs in the battery to be tested.
3. The method according to claim 2, wherein the initial discharge stage is a stage in which the voltage of the battery under test is between a first voltage and a second voltage, the initial discharge voltage of the battery under test is between the first voltage and the second voltage, and the first voltage is smaller than the second voltage.
4. The method of claim 3, wherein the first voltage is 3.30V and the second voltage is 3.45V.
5. The method of claim 1, wherein obtaining a voltage fluctuation curve of the battery under test according to the discharge curve comprises:
acquiring a second derivative of the electric quantity of the battery to be tested at each discharging moment to the voltage at the moment;
and obtaining the voltage fluctuation curve according to the second derivative and the voltage.
6. The method according to claim 5, wherein before obtaining the voltage fluctuation curve of the battery under test according to the discharge curve, the method further comprises:
obtaining the current of the battery to be tested in the discharging process;
and acquiring the integral of the current with respect to time to obtain the electric quantity of the battery to be tested at each discharging moment.
7. The method of claim 1, wherein before collecting the voltage signal during discharging of the battery under test, the method further comprises:
controlling the battery to be tested to be charged to cut-off voltage;
and controlling the battery to be tested to perform constant current discharge.
8. The method of claim 1, wherein before collecting the voltage signal during discharging of the battery under test, the method further comprises:
controlling the battery to be tested to be charged to cut-off voltage;
controlling the standing of the battery to be tested for a specified time;
and controlling the battery to be tested to perform constant current discharge.
9. The method of claim 7 or 8, wherein controlling the battery under test to charge to a cutoff voltage comprises:
controlling the battery to be tested to perform constant current charging; or,
and controlling the battery to be tested to perform constant-current and constant-voltage charging.
10. A lithium-evolving assay device, the device comprising:
the acquisition unit is used for acquiring a voltage signal in the discharging process of the battery to be detected;
the first obtaining unit is used for obtaining a discharging curve of the battery to be detected according to the voltage signal, and the discharging curve represents the relation between voltage and discharging duration;
the second acquisition unit is used for acquiring a voltage fluctuation curve of the battery to be detected according to the discharge curve, wherein the voltage fluctuation curve represents the relationship between the second derivative of the electric quantity to the voltage and the voltage;
and the detection unit is used for detecting whether the lithium analysis occurs to the battery to be detected according to the voltage fluctuation curve.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916987A (en) * | 2018-12-29 | 2019-06-21 | 欣旺达惠州动力新能源有限公司 | A kind of electrochemistry analysis lithium analysis method and its modular device |
| CN109932658A (en) * | 2019-03-06 | 2019-06-25 | 肇庆遨优动力电池有限公司 | A kind of detection method of lithium ion battery analysis lithium |
| CN110058170A (en) * | 2019-04-04 | 2019-07-26 | 桑顿新能源科技有限公司 | A kind of lithium ion battery analysis lithium nondestructive characterisation (NDC) method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193069A (en) * | 2010-02-22 | 2011-09-21 | 丰田自动车株式会社 | Determination system and determination method for determining whether metal lithium is precipitated in a lithium ion secondary battery, and vehicle equipped with the determination system |
| CN105680114A (en) * | 2016-01-07 | 2016-06-15 | 北京北交新能科技有限公司 | Low-temperature rapid self-heating method for lithium-ion battery |
| CN105866695A (en) * | 2016-04-22 | 2016-08-17 | 宁德时代新能源科技股份有限公司 | Method for detecting lithium deposition of rechargeable battery, battery management system and battery system |
| CN106099230A (en) * | 2016-08-09 | 2016-11-09 | 清华大学 | A kind of lithium ion battery fast charge method preventing to analyse lithium |
| WO2017034135A1 (en) * | 2015-08-24 | 2017-03-02 | 주식회사 엘지화학 | Lithium precipitation detection method, secondary battery charging method and apparatus using same, and secondary battery system |
| CN107176038A (en) * | 2016-03-10 | 2017-09-19 | 福特全球技术公司 | Circuit and method for detecting battery unit decline event |
| CN107728078A (en) * | 2017-11-17 | 2018-02-23 | 力信（江苏）能源科技有限责任公司 | Lithium ion battery analyses the detection method of lithium |
-
2018
- 2018-03-09 CN CN201810194583.4A patent/CN108398649B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193069A (en) * | 2010-02-22 | 2011-09-21 | 丰田自动车株式会社 | Determination system and determination method for determining whether metal lithium is precipitated in a lithium ion secondary battery, and vehicle equipped with the determination system |
| WO2017034135A1 (en) * | 2015-08-24 | 2017-03-02 | 주식회사 엘지화학 | Lithium precipitation detection method, secondary battery charging method and apparatus using same, and secondary battery system |
| CN105680114A (en) * | 2016-01-07 | 2016-06-15 | 北京北交新能科技有限公司 | Low-temperature rapid self-heating method for lithium-ion battery |
| CN107176038A (en) * | 2016-03-10 | 2017-09-19 | 福特全球技术公司 | Circuit and method for detecting battery unit decline event |
| CN105866695A (en) * | 2016-04-22 | 2016-08-17 | 宁德时代新能源科技股份有限公司 | Method for detecting lithium deposition of rechargeable battery, battery management system and battery system |
| CN106099230A (en) * | 2016-08-09 | 2016-11-09 | 清华大学 | A kind of lithium ion battery fast charge method preventing to analyse lithium |
| CN107728078A (en) * | 2017-11-17 | 2018-02-23 | 力信（江苏）能源科技有限责任公司 | Lithium ion battery analyses the detection method of lithium |
Non-Patent Citations (2)
| Title |
|---|
| H.W. KUGEL等: "《Development of lithium deposition techniques for TFTR》", 《IEEE》 * |
| 邹超等: "《锂离子电池电极材料的低温特性》", 《电池》 * |
Cited By (19)
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|---|---|---|---|---|
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