CN116581408A - Low-temperature charging method, device, equipment and medium for lithium ion battery - Google Patents
Low-temperature charging method, device, equipment and medium for lithium ion battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 58
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 68
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000001556 precipitation Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000004590 computer program Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000000802 evaporation-induced self-assembly Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 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
- 230000000750 progressive effect Effects 0.000 description 1
- 238000002601 radiography Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
- H01M10/44—Methods for charging or discharging
-
- 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
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The application relates to a low-temperature charging method, a device, equipment and a medium for a lithium ion battery, which comprise the following steps: s1, charging a lithium ion battery by adopting preset constant power under the low temperature condition; s2, acquiring three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in real time in the battery charging process; s3, judging whether lithium is separated under the constant power charging condition based on the distribution condition of lithium in the three-dimensional chromatographic image inside the lithium ion battery, and continuing to use the stepped constant power until the charging is finished if the lithium is not separated; and S4, determining the lithium precipitation position of the lithium ion battery if the lithium precipitation occurs, and charging the lithium ion battery by reducing constant power, and repeating the steps S2-S4. The application is based on the characteristic of constant power charging, and has the characteristics of maximally reducing the low-temperature charging time and simultaneously avoiding the occurrence of negative electrode lithium precipitation in the low-temperature charging process.
Description
Technical Field
The application relates to a low-temperature charging method, a device, equipment and a medium for a lithium ion battery, and relates to the technical field of power battery detection.
Background
As one of key parts of electric automobiles, lithium ion batteries are increasingly required by customers to be charged at low temperature, and the charging time is not easy to be too long. However, lithium is easily separated out during low-temperature charging of a lithium ion battery using graphite as a negative electrode material, so that occurrence of lithium dendrite is induced, and the service life and safety of the battery are affected. Therefore, avoiding occurrence of lithium precipitation during charging is of great importance to improve battery life and safety.
At present, a low-current charging and disassembling method is adopted for finding the charging boundary of the battery at low temperature, but the charging lithium-precipitation boundary cannot be found quickly, a large amount of verification work needs to be repeated, and the verification period is long, so that the development of a battery core project is not facilitated.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, in view of the above problems, the present application aims to provide a low-temperature charging method, device, equipment and medium for lithium ion batteries, which can maximally reduce the low-temperature charging time and simultaneously avoid the occurrence of lithium precipitation of a negative electrode in the low-temperature charging process.
In order to achieve the aim of the application, the application adopts the following technical scheme:
in a first aspect, the present application provides a low-temperature charging method for a lithium ion battery, including:
s1, charging a lithium ion battery by adopting preset constant power under the low temperature condition;
s2, acquiring three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in real time in the battery charging process;
s3, judging whether lithium is separated under the constant power charging condition based on the distribution condition of lithium in the three-dimensional chromatographic image inside the lithium ion battery, and continuing to use the stepped constant power until the charging is finished if the lithium is not separated;
and S4, determining the lithium precipitation position of the lithium ion battery if the lithium precipitation occurs, and charging the lithium ion battery by reducing constant power, and repeating the steps S2-S4.
Further, the charging of the lithium ion battery with the preset constant power under the low temperature condition includes:
at a low temperature of-20deg.CAt the temperature of 5 ℃, the lithium ion battery is used as CP 1 And (3) charging to a voltage V1 with constant power, and placing for a set time to enable lithium ions to be fully embedded into the negative graphite.
The system comprises a neutron photographing measurement system and an X-ray three-dimensional CT measurement system, and is used for acquiring three-dimensional tomographic images of the interior of the battery under different ladder constant power in real time in the charging process of the lithium ion battery.
Further, different step Constant Power (CP) is obtained in real time in the battery charging process 1 >CP 2 …>CP N N=1, 2,3,4, … n) three-dimensional tomographic images of the interior of the lithium ion battery, comprising:
a neutron ray source of a neutron photographic measurement system penetrates through a lithium ion battery, neutrons transmitted by the lithium ion battery are emitted to a scintillation screen, and light emitted by the scintillation screen is focused on a CCD camera to obtain a neutron image in the lithium ion battery;
an X-ray source of an X-ray three-dimensional CT measuring system passes through the lithium ion battery to obtain a CT image of the lithium ion battery;
and superposing and integrating the neutron image in the lithium ion battery and the CT image of the lithium ion battery to obtain a three-dimensional tomographic image in the lithium ion battery.
Further, the method for judging whether lithium precipitation occurs under the constant power charging condition based on the distribution condition of lithium in the three-dimensional chromatographic image inside the lithium ion battery specifically comprises the following steps:
and when the lithium element appears in the three-dimensional chromatographic image inside the lithium ion battery, judging that lithium is separated under the constant-power charging condition.
Further, the step of stopping the charging after the battery is charged to the charging cut-off voltage or receiving the charging ending instruction to end the charging process.
In a second aspect, the present application also provides a low-temperature charging device for a lithium ion battery, including:
the constant power charging unit is configured to charge the lithium ion battery with preset constant power under the condition of low temperature;
the image acquisition unit is configured to acquire three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in the battery charging process;
a lithium-out judging unit configured to judge whether or not lithium-out occurs in the constant-power charging condition based on a distribution condition of lithium in the three-dimensional tomographic image of the battery interior; if lithium is not separated, continuing to use the stepped constant power until the charging is finished, if the lithium separation occurs, determining the lithium separation position of the lithium ion battery, and reducing the constant power to charge.
In a third aspect, the present application also provides an electronic device, including: one or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.
In a fourth aspect, the present application also provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods.
The application adopts the technical proposal and has the following characteristics:
1. the application is based on the characteristic of constant power charging (the charging current is larger under the condition of low SOC, the charging time is saved, and the charging current is reduced under the condition of high SOC), and can avoid the occurrence of negative electrode lithium precipitation in the low-temperature charging process while maximally reducing the low-temperature charging time.
2. The application adopts a mode of combining a neutron photographing technology and X-ray three-dimensional CT, exactly overcomes the defects of the neutron photographing technology and the X-ray three-dimensional CT, finally forms a clear image to judge whether lithium precipitation occurs in the lithium battery, can realize real-time and nondestructive detection of lithium precipitation distribution in the whole charging process of the lithium ion battery, has important significance for relieving the service life attenuation and safety problem of the battery caused by lithium precipitation induced by charging, and has important significance for further understanding the service life attenuation mechanism of the lithium ion battery and developing the lithium battery with long service life performance.
In conclusion, the application can be widely applied to lithium ion battery charging.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a low-temperature charging method of a lithium ion battery according to an embodiment of the application.
Fig. 2 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Because the traditional analysis and test method disassembles the battery to observe the battery interface, the charging lithium-precipitation boundary can not be found quickly, and the verification period is longer, which is not beneficial to the development of the battery core project. The application provides a lithium ion battery low-temperature charging method, a device, equipment and a medium, which comprise the following steps: comprising the following steps: s1, charging a lithium ion battery by adopting preset constant power under the low temperature condition; s2, acquiring three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in real time in the battery charging process; s3, judging whether lithium is separated under the constant power charging condition based on the distribution condition of lithium in the three-dimensional chromatographic image inside the lithium ion battery, and continuing to use the stepped constant power until the charging is finished if the lithium is not separated; and S4, determining the lithium precipitation position of the lithium ion battery if the lithium precipitation occurs, and charging the lithium ion battery by reducing constant power, and repeating the steps S2-S4. Therefore, the application has the characteristics of reducing the low-temperature charging time to the maximum extent and avoiding the occurrence of negative electrode lithium precipitation in the low-temperature charging process based on the characteristic of constant power charging, and adopts a mode of combining a neutron photographing technology and X-ray three-dimensional CT to realize real-time and nondestructive detection of lithium precipitation distribution in the whole process of the lithium ion battery, thereby having important significance for relieving the service life attenuation and safety problems of the battery caused by lithium precipitation induced by charging.
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
Embodiment one: as shown in fig. 1, the low-temperature charging method for a lithium ion battery provided in this embodiment includes:
s1, charging the battery to a voltage V1 by adopting preset constant power under the condition of low temperature.
In this embodiment, the battery charging to the voltage V1 with the preset constant power under the low temperature condition includes: at the low temperature of-20 ℃ to 5 ℃, the lithium ion battery is controlled to be CP 1 Constant power (for example, voltage range 2.0-3.65V) is charged to voltage V1, and the set time is set for lithium ions to be fully embedded into the negative graphite, wherein the set time can be set according to the use requirement, and the set time is not limited herein.
S2, acquiring three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant powers on line in real time by adopting a measuring system.
In the present embodiment of the present application,constant power of different steps is CP 1 、CP 2 …CP N And CP 1 >CP 2 …>CP N ,N＝1,2,3,4…n。
In this embodiment, the measurement system includes a neutron radiography measurement system and an X-ray three-dimensional CT measurement system. Neutrons are uncharged during measurement by a neutron photographic measurement system, can easily penetrate through an electronic layer to perform nuclear reaction with atomic nuclei, are sensitive to certain light elements, are insensitive to heavy elements, and lithium metal just belongs to the light elements. The neutron photography is easy to observe the distribution of lithium, the X-ray three-dimensional CT measuring system is sensitive to heavy elements and insensitive to light elements, materials such as anode and cathode and the like belong to the fact that the heavy elements can be just identified by X-ray three-dimensional CT, the inside of a lithium ion battery is measured through the neutron photography measuring system and the X-ray three-dimensional CT measuring system, and images obtained by the neutron photography measuring system and the X-ray three-dimensional CT measuring system are overlapped to obtain a three-dimensional chromatographic image of the inside of the lithium ion battery, and the specific process comprises the following steps:
s21, a neutron ray source of a neutron photographic measurement system penetrates through the lithium ion battery, neutrons interact with atomic nuclei of the lithium ion battery, neutrons transmitted by the lithium ion battery are emitted to the scintillation screen, light emitted by the scintillation screen is reflected to the lens by the reflecting mirror and then focused on the CCD camera, and a neutron image in the lithium ion battery is obtained, wherein the incidence direction of neutron rays is perpendicular to the lithium ion battery, and the imaging area can be 10cm multiplied by 10cm.
S22, simultaneously, an X-ray source of an X-ray three-dimensional CT measuring system penetrates through the lithium ion battery to obtain a CT image of the lithium ion battery.
S23, overlapping the neutron image in the lithium ion battery and the CT image of the lithium ion battery with each other, integrating the neutron image and the CT image by using image processing software in combination with an overlapping algorithm to obtain a three-dimensional tomographic image in the lithium ion battery, and clearly obtaining the distribution condition of lithium, wherein the image processing software can adopt Matalab, and the specific process is not repeated.
And S3, judging whether lithium is separated under the constant power charging condition according to the distribution condition of lithium in the three-dimensional chromatographic image in the battery, and if the lithium is not separated, continuing to charge with the constant power of the CP1 until the charging is finished.
In this embodiment, based on the distribution condition of lithium in the three-dimensional tomographic image inside the lithium ion battery, it is determined whether lithium precipitation occurs under the constant power charging condition, specifically: and when the lithium element appears in the three-dimensional chromatographic image inside the lithium ion battery, judging that lithium is separated under the constant-power charging condition.
In this embodiment, until the charging is completed, the charging is stopped after the battery reaches the charging cut-off voltage V2, or the charging process is completed after receiving the charging end command.
S4, determining the lithium-ion battery lithium-ion position if lithium is separated, and reducing the constant-power battery to be CP 2 Constant Power (CP) 2 < CP 1) charging, repeating steps S2 to S4.
In this embodiment, the reason for the occurrence of lithium ion battery lithium precipitation is determined according to different positions of lithium ion battery lithium precipitation, such as the positions of the R angle, the large surface and the position close to the tab of the lithium ion battery, for improving the subsequent process.
The application of the lithium ion battery low-temperature charging method of the present application is described in detail below by way of specific examples.
The embodiment describes that a LiFePO4 lithium battery is charged with constant power at low temperature: 3 LiFePO square lithium ion batteries with the size of 27Ah are selected; in the environment of a low-temperature incubator at the temperature of minus 20 ℃, the lithium ion battery is firstly powered by a constant power CP 1 Setting the voltage at 15W to 3.4V, placing for 10min, obtaining the distribution of lithium concentration on the three-dimensional chromatographic image of the lithium ion battery by adopting a measurement system, judging whether lithium is separated from the interior of the lithium ion battery, and reducing constant power CP if the lithium is separated 2 The constant power 10W is charged to 3.65V, and if the constant power 15W is charged to 3.65V, the lithium precipitation is not continued.
Embodiment two: in contrast, the present embodiment provides a low-temperature charging device for a lithium ion battery. The device provided in this embodiment may implement the low-temperature charging method of the lithium ion battery in the first embodiment, and the device may be implemented by software, hardware or a combination of software and hardware. For convenience of description, the present embodiment is described while being functionally divided into various units. Of course, the functions of the units may be implemented in the same piece or pieces of software and/or hardware. For example, the apparatus may comprise integrated or separate functional modules or functional units to perform the corresponding steps in the methods of the first embodiment. Since the apparatus of this embodiment is substantially similar to the method embodiment, the description of this embodiment is relatively simple, and the relevant points may be referred to in the description of the first embodiment, and the embodiment of the low-temperature charging apparatus for a lithium ion battery provided by the present application is merely illustrative.
The lithium ion battery low temperature charging device provided in this embodiment includes:
the constant power charging unit is configured to charge the lithium ion battery with preset constant power under the condition of low temperature;
the image acquisition unit is configured to acquire three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in the battery charging process;
a lithium-out judging unit configured to judge whether or not lithium-out occurs in the constant-power charging condition based on a distribution condition of lithium in the three-dimensional tomographic image of the battery interior; if lithium is not separated, continuing to use the stepped constant power until the charging is finished, if the lithium separation occurs, determining the lithium separation position of the lithium ion battery, and reducing the constant power to charge.
Embodiment III: the present embodiment provides an electronic device corresponding to the low-temperature charging method of a lithium ion battery provided in the first embodiment, where the electronic device may be an electronic device for a client, for example, a mobile phone, a notebook computer, a tablet computer, a desktop computer, etc., so as to execute the method of the first embodiment.
As shown in fig. 2, the electronic device includes a processor, a memory, a communication interface, and a bus, where the processor, the memory, and the communication interface are connected by the bus to complete communication with each other. The bus may be an industry standard architecture (ISA, industry Standard Architecture) bus, a peripheral component interconnect (PCI, peripheral Component) bus, or an extended industry standard architecture (EISA, extended Industry Standard Component) bus, among others. The memory stores a computer program that can be executed on the processor, and when the processor executes the computer program, the processor executes the method of the first embodiment, so that the principle and technical effects are similar to those of the first embodiment, and are not described herein again. It will be appreciated by those skilled in the art that the architecture shown in fig. 2 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting of the computing devices to which the present inventive arrangements may be applied, and that a particular computing device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In a preferred embodiment, the logic instructions in the memory described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an optical disk, or other various media capable of storing program codes.
In a preferred embodiment, the processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or other general purpose processor, which is not limited herein.
Embodiment four: the present embodiment provides a computer program product, which may be a computer program stored on a computer readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the method provided in the above embodiment, and its implementation principles and technical effects are similar to those of the embodiment and are not repeated herein.
In a preferred embodiment, the computer-readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device, such as, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the foregoing. The computer-readable storage medium stores computer program instructions that cause a computer to perform the method provided by the first embodiment described above.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In the description of the present specification, reference to the terms "one preferred embodiment," "further," "specifically," "in the present embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method for low temperature charging of a lithium ion battery, comprising:
s1, charging a lithium ion battery by adopting preset constant power under the low temperature condition;
s2, acquiring three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in real time in the battery charging process;
s3, judging whether lithium is separated under the step constant power charging condition based on the distribution condition of lithium in the three-dimensional chromatographic image inside the lithium ion battery, and if the lithium is not separated, continuing to use the step constant power until the charging is finished;
and S4, determining the lithium precipitation position of the lithium ion battery if the lithium precipitation occurs, and charging the lithium ion battery by reducing constant power, and repeating the steps S2-S4.
2. The method for charging a lithium ion battery at a low temperature according to claim 1, wherein the charging the lithium ion battery with a preset constant power at the low temperature comprises:
at the low temperature of-20 ℃ to 5 ℃, the lithium ion battery is controlled to be CP 1 And (3) charging to a voltage V1 with constant power, and placing for a set time to enable lithium ions to be fully embedded into the negative graphite.
3. The method for low-temperature charging of a lithium ion battery according to claim 1, further comprising a measurement system, wherein the measurement system comprises a neutron photographic measurement system and an X-ray three-dimensional CT measurement system, and three-dimensional tomographic images of the interior of the battery under different step constant power are acquired in real time in the charging process of the lithium ion battery based on the neutron photographic measurement system and the X-ray three-dimensional CT measurement system.
4. The method for low-temperature charging of a lithium ion battery according to claim 3, wherein the step-wise constant-power three-dimensional tomographic images of the interior of the lithium ion battery are obtained in real time during the battery charging process, comprising:
a neutron ray source of a neutron photographic measurement system penetrates through a lithium ion battery, neutrons transmitted by the lithium ion battery are emitted to a scintillation screen, and light emitted by the scintillation screen is focused on a CCD camera to obtain a neutron image in the lithium ion battery;
an X-ray source of an X-ray three-dimensional CT measuring system passes through the lithium ion battery to obtain a CT image of the lithium ion battery;
and superposing and integrating the neutron image in the lithium ion battery and the CT image of the lithium ion battery to obtain a three-dimensional tomographic image in the lithium ion battery.
5. The method for low-temperature charging of a lithium ion battery according to claim 1, wherein the step constant power charging is performed based on a distribution of lithium in a three-dimensional tomographic image of the interior of the lithium ion battery, specifically:
and when the lithium element appears in the three-dimensional chromatographic image inside the lithium ion battery, judging that lithium is separated under the constant-power charging condition.
6. The method according to claim 1, wherein the step of stopping the charging after the battery is charged to the charge cutoff voltage or receiving a charge ending instruction to end the charging process.
7. A lithium ion battery low temperature charging device, comprising:
the constant power charging unit is configured to charge the lithium ion battery with preset constant power under the condition of low temperature;
the image acquisition unit is configured to acquire three-dimensional tomographic images of the interior of the lithium ion battery under different ladder constant power in the battery charging process;
a lithium-out judging unit configured to judge whether or not lithium-out occurs in the constant-power charging condition based on a distribution condition of lithium in the three-dimensional tomographic image of the battery interior; if lithium is not separated, continuing to use the stepped constant power until the charging is finished, if the lithium separation occurs, determining the lithium separation position of the lithium ion battery, and reducing the constant power to charge.
8. The lithium ion battery low-temperature charging device according to claim 7, wherein the process of obtaining the three-dimensional tomographic image of the interior of the lithium ion battery is:
a neutron ray source of a neutron photographic measurement system penetrates through a lithium ion battery, neutrons transmitted by the lithium ion battery are emitted to a scintillation screen, and light emitted by the scintillation screen is focused on a CCD camera to obtain a neutron image in the lithium ion battery;
an X-ray source of an X-ray three-dimensional CT measuring system passes through the lithium ion battery to obtain a CT image of the lithium ion battery;
and superposing and integrating the neutron image in the lithium ion battery and the CT image of the lithium ion battery to obtain a three-dimensional tomographic image in the lithium ion battery.
9. An electronic device, comprising: one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods of claims 1-6.
10. A computer readable storage medium storing one or more programs, wherein the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-6.
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