CN112277726A - Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium - Google Patents
Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium Download PDFInfo
- Publication number
- CN112277726A CN112277726A CN202011116686.2A CN202011116686A CN112277726A CN 112277726 A CN112277726 A CN 112277726A CN 202011116686 A CN202011116686 A CN 202011116686A CN 112277726 A CN112277726 A CN 112277726A
- Authority
- CN
- China
- Prior art keywords
- time period
- lithium
- current
- boundary
- battery cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 129
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000926 separation method Methods 0.000 title claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 67
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 230000008021 deposition Effects 0.000 claims description 24
- 238000007600 charging Methods 0.000 claims description 19
- 230000006870 function Effects 0.000 claims description 9
- 238000012886 linear function Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000010278 pulse charging Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a lithium ion battery cathode lithium separation protection method, a system and a computer readable storage medium, wherein the method comprises the following steps: acquiring application boundary data of the battery cell, and acquiring a plurality of key data of the battery cell according to the application boundary data; acquiring test data of pulse cycle lithium analysis of various currents of the battery cell based on a plurality of key data; according to the test data, obtaining a lithium analysis boundary current value, and carrying out interpolation processing on the lithium analysis boundary current value and a plurality of key data to obtain a complete boundary ammeter; acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity; and establishing associated data of the preset lithium analysis protection condition and the boundary ammeter, and limiting the actual current according to the associated data in real time. The problem of lithium precipitation of the negative electrode of the lithium ion battery can be effectively solved, the endurance capacity of the battery cell is improved, and the service life of the battery cell is prolonged.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode lithium separation protection method, a lithium ion battery cathode lithium separation protection system and a computer readable storage medium.
Background
With the gradual popularization of new energy electric vehicles, the safety of lithium ion batteries is also concerned. Currently, the charging method of the battery is generally classified into conventional charging and rapid charging according to charging efficiency, wherein the conventional charging includes constant current charging and constant voltage charging, and the rapid charging includes step charging and pulse charging. The charging mode of the hybrid electric vehicle is mainly a mode of total energy recovery in the driving process, namely pulse charging. In a pulse charging condition, a large energy input is often required in a short time. The lithium ion battery may have a negative electrode lithium separation phenomenon under the working conditions of fast charging, overcharge, low-temperature charging and the like, and the service life of the battery and the safety performance of the battery are seriously influenced.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and therefore, the invention provides a lithium ion battery cathode lithium separation protection method which can effectively solve the lithium ion battery cathode lithium separation problem, increase the battery cell endurance and prolong the service life of the battery cell.
In a first aspect of the present invention, a lithium ion battery negative electrode lithium deposition protection method is provided, including: acquiring application boundary data of the battery cell, and acquiring a plurality of key data of the battery cell according to the application boundary data; acquiring test data of pulse cycle lithium analysis of various currents of the battery cell based on a plurality of key data; according to the test data, obtaining a lithium analysis boundary current value, and carrying out interpolation processing on the lithium analysis boundary current value and a plurality of key data to obtain a complete boundary ammeter; acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity; and establishing associated data of the preset lithium analysis protection condition and the boundary ammeter, and limiting the actual current according to the associated data in real time.
The lithium ion battery negative electrode lithium separation protection method according to the embodiment of the first aspect of the invention has at least the following beneficial effects: the method comprises the steps of obtaining a plurality of key data of a battery cell according to application boundary data given by the battery cell, respectively carrying out pulse cycle lithium analysis tests on the battery cell on the basis of the plurality of key data of the battery cell so as to obtain a lithium analysis boundary current value, and obtaining a lithium analysis boundary ammeter of the battery cell according to the corresponding relation between the lithium analysis boundary current value and the plurality of key data. And acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity. And establishing associated data for the preset lithium analysis protection condition, the boundary current value and the boundary ammeter, and limiting the actual current in real time according to the associated data. Through the real-time restriction to the actual current, can solve the problem that the pulse current is too high and takes place the negative pole and analyse lithium effectively, increase and increase electric core duration, prolong the life of electric core.
According to some embodiments of the invention, the critical data comprises a number of critical time periods: the system comprises a first time period, a second time period, a third time period, a fourth time period, a fifth time period and a sixth time period, wherein the second time period is greater than the first time period, the third time period is greater than the second time period, the fourth time period is greater than the third time period, the fifth time period is greater than the fourth time period, and the sixth time period is greater than the fifth time period. The pulse cycle lithium analysis test current of a plurality of time periods can be obtained, the average current of the time periods can limit the actual current to different degrees, the problem of lithium analysis of the lithium ion battery cathode is effectively solved, the battery cell endurance is improved, and the service life of the battery cell is prolonged.
According to some embodiments of the invention, the lithium deposition conditions comprise: the actual current is smaller than the maximum pulse current in the second time period; the average current of the first time period is smaller than the maximum pulse current of the second time period; the average current of the second time period is smaller than the maximum pulse current of the third time period; the average current of the third time period is smaller than the maximum pulse current of the fourth time period; the average current of the fourth time period is less than the maximum pulse current of the fifth time period; the average current of the fifth time period is smaller than the maximum pulse current of the sixth time period; the average current of the sixth time period is less than the maximum current of the continuous charging; the average current over the total time is less than the maximum current for continuous charging. By limiting the maximum pulse current in different time periods to be below the average current in the time periods, the problem that the pulse current is too high so that lithium precipitation occurs in the negative electrode can be effectively solved.
Fundamentally, in some embodiments of the invention, the first time period is 2s, the second time period is 5s, the third time period is 10s, the fourth time period is 30s, the fifth time period is 60s, and the sixth time period is 180 s. Due to the limitation of the number in the lithium separation protection condition, the time periods of 2s, 5s, 10s, 30s, 60s and 180s are selected to be more representative, and the whole vehicle requirement can be better reflected. These several time periods cover the demand for lithium deposition protection conditions for most automotive plants for pulse duration requirements.
According to some embodiments of the invention, the critical data comprises: the battery core temperature control device comprises a first temperature, a second temperature and a third temperature, wherein the second temperature value is smaller than the first temperature value, the third temperature value is smaller than the second temperature value, and the third temperature value is the lowest temperature value at which the battery core normally works. The first temperature value to the third temperature value are used as main use intervals, and the battery cells under the three temperature conditions are tested, so that the requirement of the whole vehicle can be better reflected.
According to some embodiments of the invention, the lithium ion battery lithium deposition protection method further comprises: respectively acquiring pulse working condition cycle test data of a first temperature condition, a second temperature condition and a third temperature condition; acquiring lithium analysis result data of the battery cell based on the test data; if the lithium analysis result data is lithium analysis, the boundary ammeter does not meet the lithium analysis protection condition; and if the lithium analysis result data is that lithium is not analyzed, the boundary ammeter accords with the lithium analysis protection condition. By carrying out the pulse working condition cycle test under the three temperature conditions, whether the boundary ammeter meets the requirement or not can be more accurate. And if the lithium analysis result data show that lithium is analyzed, the boundary ammeter is proved to be not in accordance with the lithium analysis protection condition, and the boundary ammeter needs to be corrected. And if the lithium analysis result data show that lithium is not analyzed, the boundary ammeter is proved to be in accordance with the lithium analysis protection condition. Through the cyclic verification of the boundary current, a more accurate boundary ammeter can be obtained. And finally, limiting the actual current in real time according to the associated data. The more accurate boundary ammeter can better restrict the actual current, and then the problem that the lithium is separated out from the negative electrode due to overhigh pulse current is solved.
According to some embodiments of the present invention, the critical data includes a first remaining capacity of the battery cell, a second remaining capacity of the battery cell, and a third remaining capacity of the battery cell, where the first remaining capacity is less than the second remaining capacity, and the second remaining capacity is less than the third remaining capacity. The electric core with different residual electric quantity has different current. The first surplus electric quantity to the third surplus electric quantity are used as a main use interval of the battery cell, and pulse cycle lithium analysis testing is carried out on the battery cell in the main use electric quantity interval, so that the requirement of the whole vehicle can be better reflected.
According to some embodiments of the invention, the interpolation process is performed by: at least one of a linear function, an exponential function, and a power function is applied. The more accurate lithium precipitation boundary ammeter can be obtained by using an interpolation formula based on the boundary current value, the more accurate boundary ammeter can better limit the actual current, and the problem that the lithium precipitation of the negative electrode occurs due to overhigh pulse current is solved.
In a second aspect of the present invention, there is provided a lithium ion battery negative electrode lithium deposition protection system, including: the lithium ion battery negative electrode lithium separation protection method comprises at least one memory, at least one processor and at least one program instruction, wherein the program instruction is stored on the memory and can be executed on the processor, and when the program instruction is executed by the processor, the lithium ion battery negative electrode lithium separation protection method in the embodiment is realized.
In a third aspect of the present invention, a computer-readable storage medium is provided, where program instructions are stored on the computer-readable storage medium, and the program instructions are used to execute the lithium segregation protection method for the negative electrode of the lithium ion battery in the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of lithium deposition protection for a negative electrode of a lithium ion battery according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating the determination of the lithium-precipitating protection lithium-precipitating boundary of the negative electrode of the lithium ion battery according to the embodiment of the present invention;
fig. 3 is a lithium deposition boundary ammeter for lithium deposition protection of a negative electrode of a lithium ion battery according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or a plurality of means, the meaning of a plurality of means is two or more, and more, less, more, etc. are understood as excluding the number, and more, less, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Referring to fig. 1, in a first aspect of the present invention, a lithium-ion battery negative electrode lithium-separation protection method includes:
100. acquiring application boundary data of the battery cell, and acquiring a plurality of key data of the battery cell according to the application boundary data;
200. acquiring test data of pulse cycle lithium analysis of various currents of the battery cell based on a plurality of key data;
300. according to the test data, obtaining a lithium analysis boundary current value, and carrying out interpolation processing on the lithium analysis boundary current value and a plurality of key data to obtain a complete boundary ammeter;
400. acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity;
500. and establishing associated data of the preset lithium analysis protection condition and the boundary ammeter, and limiting the actual current according to the associated data in real time.
Specifically, each cell has its own application boundary data, such as temperature, remaining battery capacity, and charge time data. Different temperatures, residual capacities of the batteries and charging times correspond to different cell currents. The common temperature and the common residual capacity of the battery core are taken as key data, pulse cycle lithium analysis test of various currents is carried out according to the key data, test data are obtained, the current data in the use process of the vehicle can be reflected more comprehensively and accurately, and the requirement of the vehicle which is more accurate is further measured. And the lithium analysis boundary current value can be obtained according to the test data measured by the key data, and the boundary ammeter can be obtained according to the corresponding relation between the lithium analysis boundary current value and the key data. And acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity. And establishing associated data for the preset lithium analysis protection condition, the boundary current value and the boundary ammeter, and limiting the actual current in real time according to the associated data. Through the real-time restriction to the actual current, can solve the problem that the pulse current is too high and takes place the negative pole and analyse lithium effectively, increase and increase electric core duration, prolong the life of electric core.
Referring to fig. 2, the method for determining the lithium analysis boundary includes:
201. testing the current I _ a;
202. disassembling the battery core to analyze whether lithium is separated; if the lithium is not separated, step 203 is executed; otherwise, go to step 204;
203. increasing the current for testing; returning to step 202;
204. reducing the current for testing; returning to step 202;
205. steps 202 to 204 are looped until a boundary current is found.
In some embodiments of the invention, the critical data comprises a number of critical time periods: the system comprises a first time period, a second time period, a third time period, a fourth time period, a fifth time period and a sixth time period, wherein the second time period is greater than the first time period, the third time period is greater than the second time period, the fourth time period is greater than the third time period, the fifth time period is greater than the fourth time period, and the sixth time period is greater than the fifth time period. The pulse cycle lithium analysis test current of a plurality of time periods can be obtained, the average current of the time periods can limit the actual current to different degrees, the problem of lithium analysis of the lithium ion battery cathode is effectively solved, the battery cell endurance is improved, and the service life of the battery cell is prolonged.
In some embodiments of the invention, the lithium extraction protection conditions comprise: the actual current is smaller than the maximum pulse current in the second time period; the average current of the first time period is smaller than the maximum pulse current of the second time period; the average current of the second time period is smaller than the maximum pulse current of the third time period; the average current of the third time period is smaller than the maximum pulse current of the fourth time period; the average current of the fourth time period is less than the maximum pulse current of the fifth time period; the average current of the fifth time period is smaller than the maximum pulse current of the sixth time period; the average current of the sixth time period is less than the maximum current of the continuous charging; the average current over the total time is less than the maximum current for continuous charging. By limiting the maximum pulse current in different time periods to be below the average current in the time periods, the problem that the pulse current is too high so that lithium precipitation occurs in the negative electrode can be effectively solved.
In some embodiments of the invention, the first time period is 2s, the second time period is 5s, the third time period is 10s, the fourth time period is 30s, the fifth time period is 60s and the sixth time period is 180 s. Due to the limitation of the number in the lithium separation protection condition, the time periods of 2s, 5s, 10s, 30s, 60s and 180s are selected to be more representative, and the whole vehicle requirement can be better reflected. These several time periods cover the demand for lithium deposition protection conditions for most automotive plants for pulse duration requirements.
In some embodiments of the invention, the critical data comprises: the battery core temperature control device comprises a first temperature, a second temperature and a third temperature, wherein the second temperature value is smaller than the first temperature value, the third temperature value is smaller than the second temperature value, and the third temperature value is the lowest temperature value at which the battery core normally works. The first temperature value to the third temperature value are used as main use intervals, and the battery cells under the three temperature conditions are tested, so that the requirement of the whole vehicle can be better reflected.
Specifically, the first temperature is 25 ℃ at normal temperature, the second temperature is 0 ℃, and the third temperature is-30 ℃ which is the lowest temperature of normal operation of the battery cell. The higher the temperature is, the better the dynamic performance of the negative electrode material is, namely, the higher the temperature is, the higher the upper limit of the lithium deposition current is, and the condition of more than 25 ℃ can be protected according to the parameter of 25 ℃. The battery core under the three temperature conditions is tested in the main use range of the lithium ion battery at the temperature of 25 ℃ to-30 ℃, and the requirement of the whole vehicle can be better reflected.
In some embodiments of the present invention, the lithium ion battery negative electrode lithium deposition protection method further comprises: respectively acquiring pulse working condition cycle test data of a first temperature condition, a second temperature condition and a third temperature condition; acquiring lithium analysis result data of the battery cell based on the test data; if the lithium analysis result data is lithium analysis, the boundary ammeter does not meet the lithium analysis protection condition; and if the lithium analysis result data is that lithium is not analyzed, the boundary ammeter accords with the lithium analysis protection condition. By carrying out the pulse working condition cycle test under the three temperature conditions, whether the boundary ammeter meets the requirement or not can be more accurate. And if the lithium analysis result data show that lithium is analyzed, the boundary ammeter is proved to be not in accordance with the lithium analysis protection condition, and the boundary ammeter needs to be corrected. And if the lithium analysis result data show that lithium is not analyzed, the boundary ammeter is proved to be in accordance with the lithium analysis protection condition. Through the cyclic verification of the boundary current, a more accurate boundary ammeter can be obtained. And finally, limiting the actual current in real time according to the associated data. The more accurate boundary ammeter can better restrict the actual current, and then the problem that the lithium is separated out from the negative electrode due to overhigh pulse current is solved.
In some embodiments of the present invention, the critical data includes a first remaining capacity of the battery cell, a second remaining capacity of the battery cell, and a third remaining capacity of the battery cell, where the first remaining capacity is less than the second remaining capacity, and the second remaining capacity is less than the third remaining capacity. The electric core with different residual electric quantity has different current. The first surplus electric quantity to the third surplus electric quantity are used as a main use interval of the battery cell, and pulse cycle lithium analysis testing is carried out on the battery cell in the main use electric quantity interval, so that the requirement of the whole vehicle can be better reflected. Specifically, the first remaining capacity is 40%, the second remaining capacity is 60%, and the third remaining capacity is 80%. The battery cell with the residual electric quantity of 40-80% is a main use interval of the battery cell, and the battery cells with the three residual electric quantities are tested, so that the requirement of the whole vehicle can be better reflected.
In some embodiments of the present invention, the interpolation processing manner is: at least one of a linear function, an exponential function, and a power function is applied. The more accurate lithium precipitation boundary ammeter can be obtained by using an interpolation formula based on the boundary current value, the more accurate boundary ammeter can better limit the actual current, and the problem that the lithium precipitation of the negative electrode occurs due to overhigh pulse current is solved. Specifically, the linear function is used for interpolation processing of the charge state, namely the residual capacity of the battery, the exponential function is used for interpolation processing of the temperature, the power function is used for interpolation processing of the pulse duration, and a relatively accurate boundary ammeter can be obtained.
Referring to fig. 3, in the temperature dimension, interpolation processing is performed every 5 ℃ for temperatures between-30 ℃ and 25 ℃; and in the dimension of the charge state, interpolation processing is carried out on the residual capacity between 40% and 90% every 10%. And finally obtaining the current estimation value corresponding to the temperature, the residual electric quantity and the pulse time. And combining the current calculation value with the measured value of the key data point to obtain a complete lithium analysis boundary ammeter. Of course, in the temperature dimension, interpolation processing can be performed at intervals of 10 ℃ or other temperature differences; in the dimension of the charge state, the difference processing can be performed at other percentage of the remaining charge. Only the smaller the interval is, the higher the precision of the obtained lithium analysis boundary ammeter is; conversely, the lower.
In a second aspect of the present invention, there is provided a lithium ion battery negative electrode lithium deposition protection system, including: the lithium ion battery negative electrode lithium separation protection method comprises at least one memory, at least one processor and at least one program instruction, wherein the program instruction is stored on the memory and can be executed on the processor, and when the program instruction is executed by the processor, the lithium ion battery negative electrode lithium separation protection method in the embodiment is realized.
In a third aspect of the present invention, a computer-readable storage medium is provided, where program instructions are stored on the computer-readable storage medium, and the program instructions are used to execute the lithium segregation protection method for the negative electrode of the lithium ion battery in the above embodiments.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
The following describes a lithium ion battery negative electrode lithium deposition protection method according to an embodiment of the present invention in a specific embodiment with reference to fig. 1 to 3. It is to be understood that the following description is illustrative only and is not intended to be in any way limiting.
Referring to fig. 1 to 3, an embodiment of the present invention provides a lithium ion battery negative electrode lithium deposition protection method, including: acquiring application boundary data of the battery cell, and acquiring a plurality of key data of the battery cell according to the application boundary data, wherein the key data comprise a temperature value of 25 ℃, 0 ℃, minus 30 ℃, a charge state which is the percentage of residual electricity of 40%, 60% and 80%, and pulse time sequence time periods of 2s, 5s, 10s, 30s, 60s and 180 s; acquiring test data of pulse cycle lithium analysis of various currents of the battery cell based on the plurality of key data; according to the test data, obtaining a lithium analysis boundary current value, carrying out interpolation processing on the lithium analysis boundary current value and a plurality of key data, and respectively carrying out interpolation processing on three dimensions of a charge state, a temperature and a pulse duration time in an interpolation mode to obtain a complete boundary ammeter; acquiring the accumulated electric quantity of the battery cell in preset time periods of 2s, 5s, 10s, 30s, 60s and 180s in real time, and acquiring average current through the accumulated electric quantity; establishing associated data for a preset lithium analysis protection condition, a boundary current value and a boundary ammeter, and limiting the magnitude of actual current in real time according to the associated data, wherein the lithium analysis protection condition is as follows: the actual current is smaller than the maximum pulse current in the second time period; the average current of the first time period is smaller than the maximum pulse current of the second time period; the average current of the second time period is smaller than the maximum pulse current of the third time period; the average current of the third time period is smaller than the maximum pulse current of the fourth time period; the average current of the fourth time period is less than the maximum pulse current of the fifth time period; the average current of the fifth time period is smaller than the maximum pulse current of the sixth time period; the average current of the sixth time period is less than the maximum current of the continuous charging; the average current over the total time is less than the maximum current for continuous charging.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The program instructions comprise computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The storage medium includes: any entity or device capable of carrying computer program code, recording medium, computer memory, Read Only Memory (ROM), Random Access Memory (RAM), electrical carrier signals, telecommunications signals, software distribution medium, and the like. It should be noted that the storage medium may include contents that are appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, the storage medium does not include electrical carrier signals and telecommunication signals according to legislation and patent practice.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A lithium ion battery negative electrode lithium separation protection method is characterized by comprising the following steps:
acquiring application boundary data of a battery cell, and acquiring a plurality of key data of the battery cell according to the application boundary data;
acquiring test data of pulse cycle lithium analysis of various currents of the battery cell based on a plurality of key data;
according to the test data, obtaining a lithium analysis boundary current value, and carrying out interpolation processing on the lithium analysis boundary current value and a plurality of key data to obtain a complete boundary ammeter;
acquiring the accumulated electric quantity of the battery cell in a preset time period in real time, and acquiring the average current through the accumulated electric quantity;
and establishing associated data of a preset lithium analysis protection condition and the boundary ammeter, and limiting the actual current in real time according to the associated data.
2. The lithium ion battery negative pole lithium deposition protection method according to claim 1, wherein the key data comprises a number of key time periods: the system comprises a first time period, a second time period, a third time period, a fourth time period, a fifth time period and a sixth time period, wherein the second time period is greater than the first time period, the third time period is greater than the second time period, the fourth time period is greater than the third time period, the fifth time period is greater than the fourth time period, and the sixth time period is greater than the fifth time period.
3. The lithium ion battery negative electrode lithium deposition protection method according to claim 2, wherein the lithium deposition protection conditions include:
the actual current is smaller than the maximum pulse current in the second time period;
the average current of the first time period is smaller than the maximum pulse current of the second time period;
the average current of the second time period is smaller than the maximum pulse current of the third time period;
the average current of the third time period is smaller than the maximum pulse current of the fourth time period;
the average current of the fourth time period is less than the maximum pulse current of the fifth time period;
the average current of the fifth time period is smaller than the maximum pulse current of the sixth time period;
the average current of the sixth time period is less than the maximum current of the continuous charging;
the average current over the total time is less than the maximum current for continuous charging.
4. The lithium ion battery negative electrode lithium deposition protection method according to claim 3, wherein the first time period is 2s, the second time period is 5s, the third time period is 10s, the fourth time period is 30s, the fifth time period is 60s, and the sixth time period is 180 s.
5. The lithium ion battery negative pole lithium deposition protection method according to claim 1, wherein the key data comprises: the battery cell temperature control device comprises a first temperature, a second temperature and a third temperature, wherein the second temperature value is smaller than the first temperature value, the third temperature value is smaller than the second temperature value, and the third temperature value is the lowest temperature value at which the battery cell normally works.
6. The lithium ion battery negative electrode lithium deposition protection method according to claim 5, further comprising:
respectively acquiring pulse working condition cycle test data of the first temperature condition, the second temperature condition and the third temperature condition;
acquiring lithium analysis result data of the battery cell based on the test data;
if the lithium analysis result data is lithium analysis, the boundary ammeter does not meet the lithium analysis protection condition;
and if the lithium analysis result data is that lithium is not analyzed, the boundary ammeter meets the lithium analysis protection condition.
7. The lithium ion battery negative pole lithium deposition protection method of claim 1, wherein the critical data includes a first remaining capacity of the battery cell, a second remaining capacity of the battery cell, and a third remaining capacity of the battery cell, wherein the first remaining capacity is smaller than the second remaining capacity, and the second remaining capacity is smaller than the third remaining capacity.
8. The lithium ion battery negative electrode lithium deposition protection method according to claim 1, wherein the interpolation processing mode is as follows: at least one of a linear function, an exponential function, and a power function is applied.
9. A lithium ion battery negative pole lithium deposition protection system is characterized by comprising: at least one memory, at least one processor, and at least one program instruction stored on the memory and executable on the processor, the program instruction when executed by the processor implementing the lithium ion battery negative lithium evolution protection method of any of claims 1 to 8.
10. A computer-readable storage medium characterized by: the computer-readable storage medium has stored thereon program instructions for executing the lithium ion battery negative lithium deposition protection method of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011116686.2A CN112277726B (en) | 2020-10-19 | 2020-10-19 | Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011116686.2A CN112277726B (en) | 2020-10-19 | 2020-10-19 | Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112277726A true CN112277726A (en) | 2021-01-29 |
| CN112277726B CN112277726B (en) | 2022-05-17 |
Family
ID=74496572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011116686.2A Active CN112277726B (en) | 2020-10-19 | 2020-10-19 | Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112277726B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389958A (en) * | 2022-10-28 | 2022-11-25 | 江苏海铂德能源科技有限公司 | Lithium ion battery operation safety evaluation method and system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130069584A1 (en) * | 2010-06-03 | 2013-03-21 | Nissan Motor Co., Ltd. | Battery charging apparatus and battery charging method |
| 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 |
| CN107516750A (en) * | 2017-08-03 | 2017-12-26 | 国联汽车动力电池研究院有限责任公司 | A kind of method and device for determining lithium ion battery safe charging condition |
| US20190359066A1 (en) * | 2018-05-22 | 2019-11-28 | Ford Global Technologies, Llc | Method of remedying lithium plating in a high voltage battery |
| CN110940920A (en) * | 2019-11-22 | 2020-03-31 | 上海理工大学 | Method for acquiring maximum charging current of lithium battery without lithium precipitation under preset SOC (state of charge) |
| CN111082173A (en) * | 2019-12-06 | 2020-04-28 | 中国第一汽车股份有限公司 | Lithium ion battery rapid charging method based on lithium separation prevention |
| JP2020109731A (en) * | 2019-01-07 | 2020-07-16 | トヨタ自動車株式会社 | Battery controller for vehicle |
-
2020
- 2020-10-19 CN CN202011116686.2A patent/CN112277726B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130069584A1 (en) * | 2010-06-03 | 2013-03-21 | Nissan Motor Co., Ltd. | Battery charging apparatus and battery charging method |
| 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 |
| CN107516750A (en) * | 2017-08-03 | 2017-12-26 | 国联汽车动力电池研究院有限责任公司 | A kind of method and device for determining lithium ion battery safe charging condition |
| US20190359066A1 (en) * | 2018-05-22 | 2019-11-28 | Ford Global Technologies, Llc | Method of remedying lithium plating in a high voltage battery |
| JP2020109731A (en) * | 2019-01-07 | 2020-07-16 | トヨタ自動車株式会社 | Battery controller for vehicle |
| CN110940920A (en) * | 2019-11-22 | 2020-03-31 | 上海理工大学 | Method for acquiring maximum charging current of lithium battery without lithium precipitation under preset SOC (state of charge) |
| CN111082173A (en) * | 2019-12-06 | 2020-04-28 | 中国第一汽车股份有限公司 | Lithium ion battery rapid charging method based on lithium separation prevention |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389958A (en) * | 2022-10-28 | 2022-11-25 | 江苏海铂德能源科技有限公司 | Lithium ion battery operation safety evaluation method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112277726B (en) | 2022-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Stroe et al. | Lithium-ion battery state-of-health estimation using the incremental capacity analysis technique | |
| CN109856559B (en) | Lithium battery cycle life prediction method | |
| CN110161425B (en) | Method for predicting remaining service life based on lithium battery degradation stage division | |
| Barcellona et al. | Analysis of ageing effect on Li-polymer batteries | |
| CN112363075B (en) | Evaluation method for aging of lithium ion battery | |
| CN112834945A (en) | Evaluation model establishing method, battery health state evaluation method and related product | |
| CN112689934B (en) | Charging method, electronic device, and storage medium | |
| CN113109729B (en) | Vehicle power battery SOH evaluation method based on accelerated aging test and real vehicle working condition | |
| EP3671244A1 (en) | Device and method for analyzing soh | |
| CN112098875A (en) | Lithium ion battery lithium analysis detection method | |
| CN111257770B (en) | Battery pack power estimation method | |
| CN111562508A (en) | Method for online detecting internal resistance abnormality of single battery in battery pack | |
| CN104681851A (en) | Method for matching lithium ion power batteries for automobiles | |
| CN112277726B (en) | Lithium ion battery cathode lithium separation protection method and system and computer readable storage medium | |
| CN113484783B (en) | Battery SOH detection method, device, system, medium and program product | |
| CN108832187B (en) | Design method of lithium ion battery based on energy storage requirement of new energy automobile | |
| CN111551868B (en) | Consistency analysis method for lithium iron phosphate battery system | |
| CN111426966A (en) | Electric vehicle battery recombination method and device and electronic equipment | |
| CN116609669A (en) | Method and device for extracting charging condition of power battery based on big data | |
| CN115343633A (en) | Battery cell testing method, device and equipment | |
| CN111190112B (en) | Battery charging and discharging prediction method and system based on big data analysis | |
| CN109507590B (en) | Multi-interference-removal grid intelligent tracking SOC correction method and system | |
| CN111707954A (en) | Lithium iron phosphate power battery life prediction method | |
| CN113540581B (en) | Method and system for determining consistency of lithium ion cells | |
| CN114184969B (en) | Method and device for testing reversible self-discharge capacity loss of battery cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518000 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
|
| CP03 | Change of name, title or address |