CN115007503A - Battery cell sorting method, device, equipment and storage medium - Google Patents
Battery cell sorting method, device, equipment and storage medium Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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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
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- 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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a battery cell sorting method, a battery cell sorting device, battery cell sorting equipment and a storage medium. The battery cell sorting method comprises the following steps: acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data; determining a first voltage rising rate from the first voltage inflection point to the second voltage inflection point, and determining a second voltage rising rate from the second voltage inflection point to the formation termination voltage; acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished; determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage; and carrying out cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
Description
Technical Field
The embodiment of the invention relates to a battery testing technology, in particular to a battery cell sorting method, a battery cell sorting device, battery cell sorting equipment and a storage medium.
Background
The battery module is formed by the battery cores with higher consistency in the production process of the battery pack so as to ensure the normal use of the battery pack, and the battery cores with consistency are screened out mainly through a battery core sorting process at present.
The cell sorting can be divided into static sorting and dynamic sorting, wherein the static sorting is the first sorting method in the lithium battery industry, the K value, the capacity, the internal resistance, the open-circuit voltage and the like of the cell need to be measured in the static sorting, and the cell is sorted according to the numerical values of the parameters. Static sorting has the following disadvantages: the difficulty in obtaining parameters is high, and multiple processes are needed, so that the whole separation process period is long; the parameter characteristics in the working process of the battery cannot be reflected, and the future characteristics of the battery core cannot be accurately summarized.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for sorting battery cells, which aim to simplify the process flow of sorting the battery cells.
In a first aspect, an embodiment of the present invention provides a battery cell sorting method, including:
acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data;
determining a first voltage rise rate between the first voltage inflection point and the second voltage inflection point, determining a second voltage rise rate between the second voltage inflection point and the formation termination voltage;
acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished;
determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage;
and carrying out cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
Optionally, the range of the first voltage inflection point is 1.8V to 2.2V;
the range of the second voltage inflection point is 2.8V-3.2V;
the formation termination voltage ranges from 3.6V to 4.0V.
Optionally, the first discharging stage includes discharging the battery cell to a set SOC value from the formation termination voltage.
Optionally, the second discharging stage includes allowing the battery cell to stand at the first temperature for a first time period.
Optionally, the third discharging stage includes allowing the battery cell to stand at the second temperature for a second time period.
Optionally, the cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference, and the second open-circuit voltage difference includes:
and carrying out primary sorting according to the formation termination voltage, carrying out secondary sorting according to the first voltage rising rate and the second voltage rising rate, and carrying out tertiary sorting according to the first open-circuit voltage difference and the second open-circuit voltage difference.
Optionally, the set SOC value is 2% to 7% SOC.
In a second aspect, an embodiment of the present invention further provides a battery cell sorting apparatus, including a battery cell sorting unit, where the battery cell sorting unit is configured to:
acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data;
determining a first voltage rise rate between the first voltage inflection point and the second voltage inflection point, determining a second voltage rise rate between the second voltage inflection point and the formation termination voltage;
acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished;
determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage;
and sorting the battery cells according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
In a third aspect, an embodiment of the present invention further provides an electronic device, including at least one processor, and a memory communicatively connected to the at least one processor;
the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute the cell sorting method according to the embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are configured to, when executed, enable a processor to implement the battery cell sorting method according to the embodiment of the present invention.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a battery cell sorting method, which comprises the steps of obtaining formation termination voltage, a first voltage rising rate, a second voltage rising rate when a battery cell is formed, and a first open-circuit voltage difference and a second open-circuit voltage difference when the battery cell is discharged, and carrying out battery cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
Drawings
Fig. 1 is a flowchart of a cell sorting method in an embodiment;
fig. 2 is a schematic structural diagram of an electronic device in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a cell sorting method in an embodiment, and referring to fig. 1, the cell sorting method includes:
s101, formation voltage recording data are obtained, and a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data are determined.
In this embodiment, the cell sorting method is suitable for a cell that is formed, that is, before the cell is sorted, the cell should be first formed.
For example, in this embodiment, the formation voltage recording data is cell voltage variation data recorded in the cell formation process.
For example, in this embodiment, on the time axis, the cell voltage change rates before and after the first voltage inflection point are different, and the cell voltage change rates before and after the second voltage inflection point are different.
For example, for a formed voltage curve, the curve change rate in a discrete interval may be solved based on the definition of the derivative, and the voltage inflection point may be determined.
For example, in this embodiment, the formation termination voltage is used to represent the open-circuit voltage of the battery cell at the end of the formation.
In this embodiment, for example, on the time axis, the first voltage inflection point, the second voltage inflection point, and the formation termination voltage appear in sequence, and numerically, the first voltage inflection point, the second voltage inflection point, and the formation termination voltage increase in sequence.
Illustratively, in one possible embodiment, the first voltage inflection point is in the range of 1.8V to 2.2V, the second voltage inflection point is in the range of 2.8V to 3.2V, and the formation termination voltage is in the range of 3.6V to 4.0V.
S102, determining a first voltage rising rate from the first voltage inflection point to the second voltage inflection point, and determining a second voltage rising rate from the second voltage inflection point to the formation termination voltage.
Illustratively, in this embodiment, the first voltage rise rate is determined by:
in the above formula, K 1 At a first voltage rise rate, V 1 Is a first voltage inflection point, V 2 Is the second voltage inflection point, t 1 Is the time duration between the first voltage inflection point and the second voltage inflection point.
Illustratively, in this embodiment, the second voltage generation rate is determined by:
in the above formula, K 2 At a first voltage rise rate, V 2 Is the second voltage inflection point, V 3 To be converted into an end voltage, t 2 The time duration between the second voltage inflection point and the formation termination voltage.
S103, acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished.
For example, in this embodiment, the first open-circuit voltage, the second open-circuit voltage, and the third open-circuit voltage are respectively cell open-circuit voltages recorded at specified nodes when the cell is discharged;
specifically, in this embodiment, the first open-circuit voltage is a cell open-circuit voltage after the first discharge phase is ended, the second open-circuit voltage is a cell open-circuit voltage after the second discharge phase is ended, and the third open-circuit voltage is a cell open-circuit voltage after the third discharge phase is ended.
For example, in this embodiment, in the first discharge phase, the second discharge phase, and the third discharge phase, the target discharge voltages or the environmental parameters of the battery cells are different from each other.
For example, in this embodiment, the first discharge stage, the second discharge stage, and the third discharge stage may be a permutation and combination of discharging the cell from the formation termination voltage to the set SOC value, the high-temperature static cell, and the low-temperature static cell.
For example, in one possible embodiment, the first discharge phase may be set as: discharging a battery (battery cell) from a formation termination voltage to a set SOC value; setting a second discharging stage to allow the battery to stand for a first time length under the first temperature condition; and setting the third discharging stage to allow the battery to stand at the second temperature for a second time.
For example, in the present embodiment, the SOC value is set to range from 2% to 7% SOC, and for example, the SOC value may be selected to be 5% SOC.
Exemplarily, in the scheme, the first temperature condition is set to be a high temperature (60-80 ℃), and the first time duration is 10 hours; the second temperature condition is set to be a low temperature (-40 to-20 ℃), and the second time period is 10 hours.
And S104, determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage.
Illustratively, in the present embodiment, the first open-circuit voltage difference is determined according to the following formula:
ΔOCV 1 ＝COV 2 -OCV 1
in the above formula,. DELTA.OCV 1 Is the first open circuit voltage difference, OCV 1 Is the first open circuit voltage, COV 2 Is the second open circuit voltage.
Illustratively, in the present embodiment, the second open-circuit voltage difference is determined according to the following formula:
ΔOCV 2 ＝COV 3 -OCV 2
in the above formula,. DELTA.OCV 2 Is a second open circuit voltage difference, OCV 2 Is the second open circuit voltage, COV 3 Is the third open circuit voltage.
And S105, sorting the battery cells according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
For example, in this embodiment, the cells may be sorted according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference, and the second open-circuit voltage difference.
For example, the first sorting may be performed according to the formation termination voltage, the second sorting may be performed according to the first open-circuit voltage difference, the third sorting may be performed according to the second open-circuit voltage difference, the fourth sorting may be performed according to the first voltage rising rate, and the fifth sorting may be performed according to the second voltage rising rate;
after the fifth sorting, the sorting result of the battery cells can be finally determined.
For example, in one possible embodiment, cell sorting may be performed according to the following strategy:
performing primary sorting according to the formation termination voltage, performing secondary sorting according to the first open-circuit voltage difference and the second open-circuit voltage difference, and performing tertiary sorting according to the first voltage rising rate and the second voltage rising rate;
after the third sorting, the sorting result of the battery cells can be finally determined.
In an exemplary embodiment, the first sorting is performed according to the value of the formation termination voltage, the second sorting is performed according to the sum of the first voltage rising rate and the second voltage rising rate, and the third sorting is performed according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference.
Exemplarily, in this scheme, electric core is sorted in proper order based on formation termination voltage, then, first voltage rising rate, second voltage rising rate are as reflecting the charge and discharge efficiency of electric core, the foundation of good or bad SEI film forming, secondary sorting is carried out to electric core based on first voltage rising rate, second voltage rising rate, finally, first open circuit voltage difference and second open circuit voltage difference are as reflecting the foundation of electric core chemical self-discharge and physical self-discharge condition, three times sorting is carried out to electric core based on first open circuit voltage difference and second open circuit voltage difference, based on the above-mentioned layer-by-layer sorting mode, electric core can be guaranteed to have better uniformity in each dimension, the sorting effect of electric core is guaranteed.
In this embodiment, a method for sorting battery cells is provided, in the method, formation termination voltage, a first voltage rising rate, a second voltage rising rate when a battery cell is formed are obtained, and a first open-circuit voltage difference and a second open-circuit voltage difference when a battery cell is discharged are obtained according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference, so as to perform battery cell sorting.
Table 1 is a cell data table in the embodiment, and the data in table 1 is obtained by cells satisfying the following conditions:
when the battery core is discharged, setting a first discharging stage to discharge the battery (battery core) from the formation termination voltage to 5% SOC;
setting the second discharge stage as standing the battery at high temperature for 10 hours; the third discharge stage was set to allow the cell to stand at low temperature for 10 hours.
TABLE 1
For example, when the cells are sorted according to the data in table 1, primary sorting is performed according to the value of the formation termination voltage, secondary sorting is performed according to the sum of the first voltage rise rate and the second voltage rise rate, and tertiary sorting is performed according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference.
Specifically, referring to table 1, based on the formation termination voltage, the battery cells are divided into two stages, that is, the battery cell with the formation termination voltage less than 3.204 is marked as M1, and the rest of the battery cells are marked as M2;
for the cell M1, according to the sum of the first voltage rise rate and the second voltage rise rate, the cell M1 is divided into two stages, namely, the cell whose sum is less than 0.562 is marked as N1, and the rest of the cells are marked as N2;
for the cell M2, according to the sum of the first voltage rise rate and the second voltage rise rate, the cell M2 is divided into two stages, namely, the cell whose sum is less than 0.561 is marked as N3, and the rest of the cells are marked as N4;
for the cell N1, according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference, the cell N1 is divided into two stages, namely, the cell whose sum is greater than 4.621 is marked as P1, and the rest of the cells are marked as P2;
for the cell N2, according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference, the cell N2 is divided into two stages, namely, the cell whose sum is greater than 4.495 is marked as P3, and the rest of the cells are marked as P4;
for the cell N3, according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference, the cell N3 is divided into two stages, namely, the cell whose sum is greater than 4.532 is marked as P5, and the rest of the cells are marked as P6;
for the cell N4, the cell N4 is divided into two stages according to the sum of the first open-circuit voltage difference and the second open-circuit voltage difference, where a cell whose sum is smaller than 4.755 is denoted as P7, and the rest of cells are denoted as P8.
For example, after sorting, the cells are finally classified into 8 grades, i.e., P1-P8, and the cells in the same grade can be considered to have the same charge and discharge performance, i.e., have high consistency.
For example, in an implementation, before the cells are sorted, the acquired data may also be preprocessed (including formation termination voltage, first voltage rise rate, second voltage rise rate, first open-circuit voltage, second open-circuit voltage, and third open-circuit voltage), one or more groups of data including abnormal data (e.g., scatter data that is significantly too large or too small) are removed, and then, subsequent cell sorting operations are performed.
Example two
This embodiment provides a battery cell sorting unit, select separately the unit including battery cell, battery cell selects separately the unit and is used for:
acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data;
determining a first voltage rising rate from the first voltage inflection point to the second voltage inflection point, and determining a second voltage rising rate from the second voltage inflection point to the formation termination voltage;
acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished;
determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage;
and carrying out cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
For example, in this embodiment, the battery cell sorting unit may be specifically configured to implement any one of the battery cell sorting methods described in the first embodiment, and the implementation process and the beneficial effects thereof are the same as those described in the first embodiment, and are not described herein again.
EXAMPLE III
FIG. 2 illustrates a schematic diagram of an electronic device 10 that may be used to implement an embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 2, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM)12, a Random Access Memory (RAM)13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM)12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 11 performs the various methods and processes described above, such as the cell sorting method.
In some embodiments, the cell sorting method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the cell sorting method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the cell sorting method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for sorting battery cells is characterized by comprising the following steps:
acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data;
determining a first voltage rise rate between the first voltage inflection point and the second voltage inflection point, determining a second voltage rise rate between the second voltage inflection point and the formation termination voltage;
acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished;
determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage;
and carrying out cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
2. The battery cell sorting method of claim 1, wherein the first voltage inflection point is in a range of 1.8V to 2.2V;
the range of the second voltage inflection point is 2.8V-3.2V;
the formation termination voltage ranges from 3.6V to 4.0V.
3. The cell sorting method of claim 1, wherein the first discharge phase comprises discharging the cells from the formation termination voltage to a set SOC value.
4. The cell sorting method of claim 1, wherein the second discharge phase comprises the cell resting at the first temperature condition for a first length of time.
5. The cell sorting method of claim 1, wherein the third discharge phase comprises the cell resting at the second temperature condition for a second length of time.
6. The cell sorting method of claim 1, wherein the cell sorting according to the formation termination voltage, the first voltage rise rate, the second voltage rise rate, the first open-circuit voltage difference, and the second open-circuit voltage difference comprises:
and carrying out primary sorting according to the formation termination voltage, carrying out secondary sorting according to the first voltage rising rate and the second voltage rising rate, and carrying out tertiary sorting according to the first open-circuit voltage difference and the second open-circuit voltage difference.
7. The cell sorting method of claim 3, wherein the set SOC value is 2% to 7% SOC.
8. The utility model provides a battery core sorting unit, its characterized in that, selects separately the unit including the battery core, the battery core selects separately the unit and is used for:
acquiring formation voltage recording data, and determining a first voltage inflection point, a second voltage inflection point and formation termination voltage in the formation voltage recording data;
determining a first voltage rise rate between the first voltage inflection point and the second voltage inflection point, determining a second voltage rise rate between the second voltage inflection point and the formation termination voltage;
acquiring a first open-circuit voltage after the first discharging stage is finished, acquiring a second open-circuit voltage after the second discharging stage is finished, and acquiring a third open-circuit voltage after the third discharging stage is finished;
determining a first open-circuit voltage difference according to the first open-circuit voltage and the second open-circuit voltage, and determining a second open-circuit voltage difference according to the second open-circuit voltage and the third open-circuit voltage;
and carrying out cell sorting according to the formation termination voltage, the first voltage rising rate, the second voltage rising rate, the first open-circuit voltage difference and the second open-circuit voltage difference.
9. An electronic device comprising at least one processor, and a memory communicatively coupled to the at least one processor;
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the cell sorting method of any of claims 1-7.
10. A computer-readable storage medium storing computer instructions for causing a processor to implement the cell sorting method according to any one of claims 1 to 7 when executed.
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