CN107742754B - State evaluation method of lithium titanate power battery system - Google Patents
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 54
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000011156 evaluation Methods 0.000 title claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000002159 abnormal effect Effects 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 8
- 206010016766 flatulence Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a state evaluation method of a lithium titanate power battery system, which comprises the following steps: continuously monitoring the state parameters of the lithium titanate power battery system by taking a preset mileage as a unit; calculating a temperature range, a charge cut-off voltage range and a discharge cut-off voltage range based on the state parameters collected in each preset mileage; then respectively calculating the difference value delta T of the adjacent temperature range and the difference value delta V of the adjacent charging cut-off voltage range according to the range difference obtained in the current preset range and the previous preset rangeCharging deviceThe difference value delta V of the adjacent discharge cut-off voltage rangePut(ii) a Firstly, judging whether the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range are respectively smaller than respective first threshold values, and if so, judging delta T and delta VCharging deviceAnd Δ VPutAnd whether the lithium titanate battery system state is good or not is respectively smaller than the second threshold value, and if the lithium titanate battery system state is good, the lithium titanate battery system state is judged. By implementing the method, the stability of the operation of the lithium titanate battery system can be rapidly evaluated, and the method is simple and feasible.
Description
Technical Field
The invention relates to the technical field of battery systems, in particular to a state evaluation method of a lithium titanate power battery system.
Background
China in 2009 promises that the total carbon dioxide emission in China in 2020 units is reduced by 40-45% compared with 2005, which requires that most domestic fuel vehicles are replaced by new energy vehicles, and hybrid vehicles with the oil saving rate as high as 40-60% are one of the mainstream of the current requirements.
The lithium titanate battery has the following advantages: the lithium titanate battery has the advantages of being high in safety (non-flammable and non-explosive), ultra-long in service life (30000 times), wide in high-low temperature working range (40-65 ℃), high in power (supporting 10C charging and discharging, and capable of being charged to more than 90% of rated capacity within-10 min), low in cost (the battery cathode only accounts for 20% -30% of the cost of the full battery), and low in price of the lithium titanate battery according to the cost of each cycle; the ultra-long service life and the ultra-high safety mean that the number of times of replacing the battery and the maintenance cost thereof are reduced; in addition, the current collector of the lithium titanate negative electrode is aluminum instead of expensive copper, and the lithium titanate negative electrode is environment-friendly.
The contrast ternary lithium cell, lithium iron phosphate battery, lithium titanate battery have several advantages: high-temperature safety, good low-temperature performance, long cycle life and quick charging. The lithium titanate battery technology and the application thereof in the new energy automobile market are inexorable and cannot come any longer under the large environment of the current Chinese government advocating the development of new energy and related industries under the support of the national vigorous development of the charging pile market and the lithium titanate quick charging technology. The lithium titanate is successfully applied to new energy automobiles, and is the pioneer for realizing 'curve overtaking' of new energy automobiles and automobile fierce national dream in China. The top technological force can promote the great advance of the new energy industry in China and even all over the world.
As a power battery system with a lithium titanate battery as a core, due to its high rate characteristic and gas expansion characteristic, the operating state of the lithium titanate power battery system needs to be frequently evaluated and predicted to maintain the continuous operation of the whole new energy vehicle. Considering the high-power discharge of the lithium titanate battery, the control of the voltage is very important, and meanwhile, the overhigh voltage also has influence on the lithium titanate flatulence; considering the flatulence characteristic of lithium titanate, the influence of high temperature on the flatulence of lithium titanate is serious, so that the control of high temperature is very important. Therefore, it is necessary to evaluate the stability of the lithium titanate battery in the new energy vehicle in real time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a state evaluation method of a lithium titanate power battery system, aiming at the defect that the running stability state of a lithium titanate battery in a new energy vehicle cannot be evaluated in real time in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a state evaluation method for constructing a lithium titanate power battery system comprises the following steps:
s1, continuously monitoring state parameters of the lithium titanate power battery system by taking a preset mileage as a unit, wherein the state parameters comprise temperature, charge cut-off voltage and discharge cut-off voltage parameters;
s2, calculating a temperature range, a charge cut-off voltage range and a discharge cut-off voltage range based on the highest value and the lowest value of the temperature, the charge cut-off voltage and the discharge cut-off voltage parameters collected in each preset mileage; then according to the temperature range difference, the charging cut-off voltage range difference and the discharging cut-off voltage range difference obtained in the current preset range and the previous preset range, respectively calculating the adjacent temperature range difference value delta T and the adjacent charging cut-off voltage range difference value delta VCharging deviceThe difference value delta V of the adjacent discharge cut-off voltage rangePut；
S3, judging whether the temperature range, the charging cut-off voltage range and the discharging cut-off voltage range are respectively smaller than respective first threshold values, and if so, entering the step S4;
s4, judging the Δ T and Δ VCharging deviceAnd Δ VPutWhether each is smaller than the respective second threshold, if yes, perform step S5;
and S5, judging that the state of the lithium titanate battery system is good, and returning to the step S1.
Preferably, in the step S3, if any one of the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range is not less than the respective first threshold, the method goes to step S6;
and S6, judging that the lithium titanate battery system needs maintenance and sending corresponding alarm information.
Preferably, step S4 further includes: if said Δ T, Δ VCharging device、△VPutIf any one of the abnormal values is not less than the respective second threshold value, counting as an abnormal value, judging whether the number of times of continuous occurrence of the abnormal value is less than the preset number of times based on the current and past abnormal value counts, if so, executing the step S5, otherwise, jumping to the step S6.
Preferably, the predetermined number of consecutive occurrences is three.
Preferably, the predetermined mileage is one hundred kilometers.
Preferably, the first threshold values corresponding to the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range are 15 ℃, 0.01V and 0.01V respectively.
Preferably, the temperature range difference DeltaT and the charge cut-off voltage range difference DeltaVCharging deviceThe difference value of the discharge cut-off voltage pole difference Delta VPutThe corresponding second thresholds are 1 deg.C, 0.001V, and 0.001V, respectively.
The state evaluation method of the lithium titanate power battery system has the following beneficial effects that: the adverse effect of high pressure and high temperature on lithium titanate, especially the effect on flatulence can be fully considered, and the operation stability of a lithium titanate battery system can be evaluated by comparing the information such as temperature, charge cut-off voltage and discharge cut-off voltage of each preset mileage and the relationship among the temperature, charge cut-off voltage and discharge cut-off voltage of a plurality of adjacent preset miles; the method is simple and easy to implement, and compared with the conventional lithium iron and ternary batteries, the method can be used for evaluating the operation stability without calculating the capacity, SOC (state of charge) and the like of the battery, and is suitable for industrialized implementation.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic flow chart of an embodiment of a state evaluation method for a lithium titanate power battery system according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a schematic flow chart of a state evaluation method of a lithium titanate power battery system of the present invention specifically includes:
and S1, continuously monitoring state parameters of the lithium titanate power battery system by taking a preset mileage as a unit, wherein the state parameters comprise temperature, charge cut-off voltage and discharge cut-off voltage parameters.
Specifically, the predetermined mileage can be determined as required, wherein one hundred kilometers is selected as the predetermined mileage, and the state parameters within each continuous one hundred kilometers are monitored. The state parameters may also include parameters other than temperature, charge cutoff voltage, and discharge cutoff voltage parameters.
S2, calculating a temperature range, a charge cut-off voltage range and a discharge cut-off voltage range based on the highest value and the lowest value of the temperature, the charge cut-off voltage and the discharge cut-off voltage parameters collected in each preset mileage; then, according to the temperature range difference, the charging cut-off voltage range difference and the discharging cut-off voltage range difference obtained in the current preset range and the previous preset range, respectively calculating the difference value delta T of the adjacent temperature range differences and the difference value delta V of the adjacent charging cut-off voltage range differencesCharging deviceDifference value delta V of adjacent discharge cut-off voltage rangePut。
The range difference here refers to a difference value between the highest value and the lowest value of the temperature, the charge cut-off voltage, and the discharge cut-off voltage parameters collected within each predetermined range collected within the predetermined range, where the predetermined range is set as required, and is one hundred kilometers in this embodiment. The difference value of adjacent range refers to the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range within each one hundred kilometers, and the corresponding temperature range, charge cut-off voltage range and discharge cut-off voltage range within the next one hundred kilometers, wherein the range difference values are absolute values.
S3, judging whether the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range are respectively smaller than the first threshold value, if so, entering the step S4.
The first threshold values corresponding to the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range are 15 ℃, 0.01V and 0.01V respectively, and of course, other values can be taken according to needs.
S4, redetermining DeltaT and DeltaVCharging deviceAnd Δ VPutIf the respective values are smaller than the respective second threshold values, if so, step S5 is executed.
Wherein Δ T and Δ VCharging device、△VPutThe corresponding second threshold values are 1 ℃, 0.001V and 0.001V respectively;of course, these thresholds may take other values as needed.
S5, the state of the lithium titanate battery system is determined to be good, and the process returns to step S1.
In the present embodiment, in step S3, if any one of the temperature range, the charge cut-off voltage range, and the discharge cut-off voltage range is not less than the respective first threshold value, the process proceeds to step S6.
S6, judging that the lithium titanate battery system needs maintenance and sending corresponding alarm information.
Specifically, if the new energy vehicle using the lithium titanate battery system needs to give an alarm, maintenance can be performed; if the state of the lithium titanate battery system is judged to be good, the new energy vehicle using the lithium titanate battery system can continue to operate.
In this embodiment, step S4 further includes: if Δ T, Δ VCharging device、△VPutIf any one of the abnormal values is not less than the respective second threshold value, counting as an abnormal value, and judging whether the number of times of continuous occurrence of the abnormal values is less than the preset number of times based on the current and past abnormal counts, wherein the preset number of times of continuous occurrence is three times, if the number of times of continuous occurrence of the abnormal values is less than three times, executing the step S5, and if the number of times of continuous occurrence of the abnormal values is less than three times, jumping to the step S6. The predetermined number of times of the default consecutive exception technique may also be other suitable values, and is not limited to the number of times selected in this embodiment.
In this embodiment, the maximum temperature in the lithium titanate power battery system refers to the highest value of temperature information collected by a temperature sensor collected by a Battery Management System (BMS) in the lithium titanate power battery system within a hundred kilometers; the minimum temperature in the lithium titanate power battery system is the lowest value of temperature information collected by a temperature sensor collected by a Battery Management System (BMS) in the lithium titanate power battery system within a hundred kilometers, and various required parameters can be obtained by other collection modes.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (4)
1. A state evaluation method of a lithium titanate power battery system is characterized by comprising the following steps:
s1, continuously monitoring state parameters of the lithium titanate power battery system by taking a preset mileage as a unit, wherein the state parameters comprise temperature, charge cut-off voltage and discharge cut-off voltage parameters;
s2, calculating a temperature range, a charge cut-off voltage range and a discharge cut-off voltage range based on the highest value and the lowest value of the temperature, the charge cut-off voltage and the discharge cut-off voltage parameters collected in each preset mileage; then according to the temperature range difference, the charging cut-off voltage range difference and the discharging cut-off voltage range difference obtained in the current preset range and the previous preset range, respectively calculating the adjacent temperature range difference value delta T and the adjacent charging cut-off voltage range difference value delta VCharging deviceThe difference value delta V of the adjacent discharge cut-off voltage rangePut；
S3, judging whether the temperature range, the charging cut-off voltage range and the discharging cut-off voltage range are respectively smaller than respective first threshold values, and if so, entering the step S4;
s4, judging the adjacent temperature range difference value delta T and the adjacent charging cut-off voltage range difference value delta VCharging deviceAnd the difference value delta V of the adjacent discharge cut-off voltage polesPutWhether each is smaller than the respective second threshold, if yes, perform step S5;
s5, judging that the state of the lithium titanate battery system is good, and returning to the step S1;
in the step S3, if any one of the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range is not less than the respective first threshold, jumping to step S6;
s6, judging that the lithium titanate battery system needs maintenance and sending corresponding alarm information;
step S4 further includes: if the adjacent temperature range difference value Delta T and the adjacent charging cut-off voltage range difference value Delta V are presentCharging deviceThe difference value delta V of the adjacent discharge cut-off voltage rangePutIf any one of the abnormal values is not less than the respective second threshold value, counting as an abnormal value, judging whether the continuous occurrence frequency of the abnormal value is less than the preset frequency based on the current and past abnormal value counts, if so, executing the step S5, otherwise, jumping to the step S6; the predetermined number of consecutive occurrences is three.
2. The state evaluation method of a lithium titanate power cell system of claim 1, wherein the predetermined mileage is a hundred kilometers.
3. The state evaluation method of a lithium titanate power battery system according to claim 1,
the first threshold values corresponding to the temperature range, the charge cut-off voltage range and the discharge cut-off voltage range are respectively 15 ℃, 0.01V and 0.01V.
4. The state evaluation method of a lithium titanate power battery system according to claim 3,
the adjacent temperature range difference value Delta T and the adjacent charging cut-off voltage range difference value Delta VCharging deviceThe difference value delta V of the adjacent discharge cut-off voltage rangePutThe corresponding second thresholds are 1 deg.C, 0.001V, and 0.001V, respectively.
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| CN113341332A (en) * | 2021-05-25 | 2021-09-03 | 三一重机有限公司 | Battery thermal runaway early warning method and device, operation machine and electronic equipment |
| CN115529520B (en) * | 2022-09-26 | 2025-09-19 | 歌尔科技有限公司 | Earphone tone quality testing method and device, testing terminal and storage medium |
| CN116125300A (en) * | 2022-12-13 | 2023-05-16 | 章鱼博士智能技术(上海)有限公司 | A battery pack abnormality monitoring method, device, electronic equipment and storage medium |
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| CN102315663A (en) * | 2010-06-29 | 2012-01-11 | 凹凸电子（武汉）有限公司 | Battery management system and method |
| CN102574477A (en) * | 2009-10-19 | 2012-07-11 | 罗伯特·博世有限公司 | Method and charge controller for increasing the service life of secondary batteries |
| CN104410131A (en) * | 2014-12-17 | 2015-03-11 | 安徽安凯汽车股份有限公司 | Vehicle-mounted mobile charge system and mobile charge control method thereof |
| CN106654403A (en) * | 2015-10-30 | 2017-05-10 | 北汽福田汽车股份有限公司 | Method for preventing battery failure false alarm and apparatus thereof |
| 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 |
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| DE102015201628A1 (en) * | 2015-01-30 | 2016-08-04 | Robert Bosch Gmbh | Monitoring of a battery system during control-related debounce times |
| JP2017059343A (en) * | 2015-09-15 | 2017-03-23 | 三菱製紙株式会社 | Evaluation method of member for lithium ion secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102574477A (en) * | 2009-10-19 | 2012-07-11 | 罗伯特·博世有限公司 | Method and charge controller for increasing the service life of secondary batteries |
| CN102315663A (en) * | 2010-06-29 | 2012-01-11 | 凹凸电子（武汉）有限公司 | Battery management system and method |
| CN104410131A (en) * | 2014-12-17 | 2015-03-11 | 安徽安凯汽车股份有限公司 | Vehicle-mounted mobile charge system and mobile charge control method thereof |
| CN106654403A (en) * | 2015-10-30 | 2017-05-10 | 北汽福田汽车股份有限公司 | Method for preventing battery failure false alarm and apparatus thereof |
| 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 |
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