CN115825765A - Battery cell lithium separation detection method and device and battery management system - Google Patents
Battery cell lithium separation detection method and device and battery management system Download PDFInfo
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- CN115825765A CN115825765A CN202211530001.8A CN202211530001A CN115825765A CN 115825765 A CN115825765 A CN 115825765A CN 202211530001 A CN202211530001 A CN 202211530001A CN 115825765 A CN115825765 A CN 115825765A
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Abstract
The application discloses a battery cell lithium precipitation detection method and device and a battery management system. If the detected negative electrode potential is less than or equal to the reference potential, the battery cell can be determined to start to analyze lithium, and the reference potential is less than zero volt. The method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, and accords with the thermodynamic explanation of the lithium analysis process of the battery cell, so the accuracy of the lithium analysis detection of the battery cell is improved.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery cell lithium analysis detection method and device and a battery management system.
Background
The lithium ion battery may include a housing and a cell located within the housing. During the charging process of the lithium ion battery, lithium separation of the battery cell can be caused due to high multiplying power, low temperature or mismatching of positive and negative electrode capacities and the like. Lithium precipitation from the battery core can not only cause active lithium loss and capacity loss of the battery core, but also pierce the isolating membrane to cause short circuit of the battery core under severe conditions, thereby causing safety problems. Therefore, the battery cell lithium analysis can be effectively identified and early warning can be carried out, the battery cell of lithium analysis can be detected in a factory, the battery cell is prevented from flowing to a market end, early warning can be carried out at the market end, and safety guarantee is provided for users.
However, the accuracy of the lithium analysis detection of the cell in the related art is low.
Disclosure of Invention
In view of the above problems, the present application provides a method and an apparatus for detecting battery cell lithium separation, and a battery management system, which can solve the problem of relatively low accuracy of battery cell lithium separation detection in the related art.
In a first aspect, a method for detecting lithium deposition from a battery cell is provided, and the method includes:
detecting the negative electrode potential of the battery cell of the battery in the process of charging the battery;
and if the detected negative electrode potential is less than or equal to the reference potential, determining that the battery cell begins to analyze lithium, wherein the reference potential is less than zero volt.
The battery management system may detect a negative electrode potential of the battery cell during charging of the battery, and may determine that the battery cell starts to separate lithium if the detected negative electrode potential is less than or equal to a reference potential, where the reference potential is less than zero volts. The method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, and accords with the thermodynamic explanation of the lithium analysis process of the battery cell, so the accuracy of the lithium analysis detection of the battery cell is improved.
Optionally, the battery cell is a three-electrode battery cell, where the detecting a negative electrode potential of the battery cell includes:
determining a first potential of a negative electrode of the cell and a second potential of a reference electrode;
the negative electrode potential is determined from the first potential and the second potential. The negative electrode potential is thus determined accurately.
Optionally, determining the negative electrode potential according to the first potential and the second potential includes:
and determining the difference value of the first potential and the second potential as the negative electrode potential. The negative electrode potential is thus determined accurately.
Optionally, when it is determined that the battery cell starts to separate lithium, the method further includes:
and sending alarm information, wherein the alarm information is used for prompting the battery cell to analyze lithium. When the lithium analysis is started through the battery cell, alarm information is sent, so that in-process detection personnel can timely know that the lithium analysis is started through the battery cell before the battery cell leaves a factory, and the next operation is carried out. And in the process of using the battery by the user after leaving the factory, the user can be reminded in time so as to stop charging.
Optionally, after determining that the battery cell starts to extract lithium, the method further includes:
determining a first capacity of the battery cell when the negative electrode potential is less than or equal to the reference potential, and determining a second capacity of the battery cell when the charging voltage of the battery cell reaches a cutoff voltage;
and determining the lithium precipitation capacity of the battery cell according to the second capacity and the first capacity. Compared with the method for detecting the lithium analysis capacity by adopting a gas chromatography titration method or an ion pair chromatography (ICP) method and the like in the related technology, the method provided by the embodiment of the disclosure can realize nondestructive detection without disassembling the battery cell, can obtain the lithium analysis capacity in real time, and improves the efficiency and the accuracy of the lithium analysis capacity detection.
Optionally, determining the lithium separation capacity of the battery cell according to the second capacity and the first capacity, including:
and determining the difference value between the second capacity and the first capacity as the lithium analysis capacity of the battery cell, thereby realizing accurate detection of the lithium analysis capacity.
Optionally, after determining the lithium separation capacity of the battery cell according to the second capacity and the first capacity, the method further includes:
optionally, after determining the lithium separation capacity of the battery cell according to the second capacity and the first capacity, the method further includes:
determining one or more of a state of charge of the cell, an aging state of the cell, and a safety state of the cell from the lithium evolution capacity. Therefore, one or more of the state of charge of the battery cell, the aging state of the battery cell and the safety state of the battery cell can be accurately and efficiently predicted.
Optionally, after determining the lithium separation capacity of the battery cell according to the second capacity and the first capacity, the method further includes:
and if the lithium analysis capacity is larger than the preset capacity threshold value, sending out prompt information. When the lithium analysis capacity is larger than the preset capacity threshold value, prompt information is sent, so that before the battery cell leaves the factory, a worker can determine whether the battery cell can leave the factory according to the lithium analysis capacity. And whether to continue using the battery can be determined according to the lithium analysis capacity during the use process of the user after the factory shipment.
In a second aspect, a computer-readable storage medium is provided, on which a cell lithiation detection program is stored, which when executed by a processor implements the method of the above aspect.
In a third aspect, a battery management system is provided, which includes a memory, a processor, and a battery cell lithium analysis detection program stored in the memory and executable on the processor, and when the processor executes the battery cell lithium analysis detection program, the method of the above aspect is implemented.
In a fourth aspect, a lithium battery cell analysis detection apparatus is provided, the apparatus comprising:
the detection module is used for detecting the negative pole potential of the battery cell of the battery in the process of charging the battery;
and the determining module is used for determining that the battery cell starts to analyze lithium when the detecting module detects that the negative electrode potential is less than or equal to a reference potential, wherein the reference potential is less than zero volt.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
Fig. 1 is a schematic diagram illustrating a change in a negative electrode potential of a battery cell during a battery charging process according to an embodiment of the present disclosure;
FIG. 2 is an enlarged schematic view of a nucleation portion;
fig. 3 is a flowchart of a method for detecting lithium deposition in a battery cell according to an embodiment of the present disclosure;
fig. 4 is a flowchart of another method for detecting lithium evolution in a cell provided by an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a battery management system provided in an embodiment of the present disclosure;
fig. 6 is a block diagram of a cell lithium analysis detection apparatus provided in an embodiment of the present disclosure;
FIG. 7 is a block diagram of a detection module provided by embodiments of the present disclosure;
fig. 8 is a block diagram of another cell lithium analysis detection apparatus provided in the embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present disclosure, and should not be construed as limiting the present disclosure.
A lithium ion battery may include a housing and a cell located within the housing. In the charging process of the lithium ion battery, lithium ions cannot be embedded into graphite due to high multiplying power, low temperature or mismatching of capacities of the anode and the cathode, and the lithium ions are reduced to be elementary lithium on the surface of the cathode, namely, a lithium precipitation process of the battery core. Lithium precipitation from the battery core can not only cause active lithium loss and capacity loss of the battery core, but also pierce the isolating membrane to cause short circuit of the battery core under severe conditions, thereby further causing safety problems. Therefore, the battery cell lithium analysis and the lithium analysis amount can be effectively identified and early-warning can be carried out, so that the battery cell of lithium analysis can be detected in a factory, the battery cell is prevented from flowing to a market end, early-warning can also be carried out at the market end, and safety guarantee is provided for users.
Experiments of the applicant show that in the process of charging the lithium ion battery, lithium ions are reduced to lithium atoms on the surface of graphite, and the lithium atoms can further grow to form lithium dendrites after diffusion, aggregation and nucleation. And certain nucleation barrier needs to be overcome when lithium atoms are aggregated and nucleated, so that the negative electrode potential of the battery cell needs to be reduced to below zero volt when the battery cell begins to perform lithium precipitation.
Fig. 1 is a schematic diagram illustrating a change in a negative electrode potential of a battery cell during a battery charging process according to an embodiment of the present disclosure, and fig. 2 is an enlarged schematic diagram of a nucleation portion. Referring to fig. 1 and 2, the horizontal axis of the diagram is the cell capacity in milliampere-hours (mAh). The vertical axis is the negative electrode potential of the cell, which has the unit of volts (V). Along with the continuous progress of charging, lithium ions are continuously embedded into the graphite, and the negative electrode potential of the battery cell is continuously reduced until the lithium ions cannot be embedded into the graphite. Lithium ions begin to accumulate on the graphite surface, and the negative electrode potential of the battery cell is zero volts. Then the potential of the negative electrode drops to below zero volt sharply, the peak appearing in the diagram represents the nucleation process, the process needs to overcome the nucleation barrier, the over potential drives the lithium atoms to nucleate, and therefore the potential at the peak is called the nucleation over potential eta n, namely the initiation of the lithium precipitation nucleation. After nucleation, lithium ions tend to grow on the existing nuclei. Therefore, during the charging process of the battery, when the cathode potential of the battery cell is detected to be less than or equal to the nucleation overpotential η n, the battery cell can be determined to start to precipitate lithium, and the nucleation overpotential η n is less than zero volts.
The embodiment of the disclosure provides a battery cell lithium evolution detection method, in the method, when a negative electrode potential of a battery cell is less than or equal to a reference potential, it is determined that the battery cell starts to evolve lithium, and the reference potential is the nucleation overpotential. The reference potential is less than zero volts. The method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, and accords with the thermodynamic explanation of the lithium analysis process of the battery cell, so the accuracy of the lithium analysis detection of the battery cell is improved. The risk of lithium precipitation of the battery cell is reduced, better charge and discharge reversibility is maintained, and the cycle performance of the battery cell is improved.
Fig. 3 is a flowchart of a method for detecting lithium deposition in a battery cell provided in an embodiment of the present disclosure, and is applied to a battery management system, as shown in fig. 3, the method includes:
The battery management system may periodically or in real time detect the negative electrode potential of the battery during charging of the battery.
And 302, if the detected negative electrode potential is less than or equal to the reference potential, determining that the battery cell begins to analyze lithium.
If the battery management system detects that the negative electrode potential is less than or equal to the reference potential, it may be determined that the battery cell starts to perform lithium separation. The reference potential is pre-stored in the battery management system and is less than zero volt.
In summary, the embodiments of the present disclosure provide a method for detecting a lithium deposition from a battery cell, in which a battery management system may detect a negative electrode potential of the battery cell during charging of the battery, and if the detected negative electrode potential is less than or equal to a reference potential, it may be determined that the battery cell starts to deposit lithium. The reference potential is less than zero volt, the method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, accords with the thermodynamic interpretation of the lithium analysis process of the battery cell, and enables the accuracy of the lithium analysis detection of the battery cell to be higher.
Fig. 4 is another method for detecting lithium deposition from a battery cell according to an embodiment of the present disclosure, where the method may be applied to a battery management system, and as shown in fig. 4, the method may include:
In embodiments of the present disclosure, the cell may be a three-electrode cell, i.e., the cell may include a positive electrode, a negative electrode, and a reference electrode. The battery management system can periodically or in real time acquire the first potential of the negative electrode and the second potential of the reference electrode during the charging process of the battery.
And 402, determining the negative electrode potential according to the first potential and the second potential.
The battery management system may determine the negative electrode potential from the first potential and the second potential after determining the first potential and the second potential. Optionally, the battery management system may determine a difference between the first potential and the second potential as the negative electrode potential, so as to detect the negative electrode potential of the battery cell.
And step 403, detecting whether the cathode potential is less than or equal to the reference potential.
After determining the negative electrode potential of the battery cell, the battery management system may detect whether the negative electrode potential is less than or equal to a reference potential. If it is detected that the negative electrode potential is less than or equal to the reference potential, it may be determined that the battery cell starts to extract lithium, and then step 404 may be performed. If it is detected that the negative electrode potential is greater than the reference potential, it may be determined that lithium is not separated from the battery cell, and therefore step 401 may be continuously performed.
The reference potential is stored in the battery management system in advance and is smaller than zero volt. The reference potential is the nucleation overpotential η n. For example, referring to FIG. 2, the reference potential may be-0.006158 volts (V).
And step 404, sending alarm information.
The battery management system can send alarm information when determining that the battery cell begins to analyze lithium, wherein the alarm information is used for prompting the battery cell to analyze lithium. When the lithium analysis is started through the battery cell, alarm information is sent, so that in-process detection personnel can timely know that the lithium analysis is started through the battery cell before the battery cell leaves a factory, and the next operation is carried out. And in the process of using the battery by the user after leaving the factory, the user can be reminded in time so as to stop charging.
The battery management system may also determine the first capacity of the cell when the negative electrode potential is less than or equal to the reference potential after determining that the cell starts to extract lithium, and determine the second capacity of the cell when the charge voltage of the cell reaches the cutoff voltage.
Table 1 shows the first capacity Q of the cell when the negative potential is equal to the reference potential n And a second capacity Q of the cell when the charge voltage of the cell reaches a cutoff voltage full . Referring to fig. 2 and table 1, a first capacity Q of a cell when a negative electrode potential of the cell is equal to-0.006158V n May be 78.335mAh, second capacity Q full May be 149.329mAh.
TABLE 1
| Reference potential | First capacity Q n | Second capacity Q full | Lithium deposition capacity Q Li |
| -0.006158V | 78.335mAh | 149.329mAh | 70.994mAh |
And step 406, determining the lithium analysis capacity of the battery cell according to the second capacity and the first capacity.
After determining the first capacity and the second capacity, the battery management system may determine the lithium deposition capacity of the battery cell according to the second capacity and the first capacity. Optionally, the battery management system may adjust the second capacity Q full And a first capacity Q n The difference is determined as the lithium deposition capacity of the cell, i.e. the lithium deposition capacity Q of the cell Li Can satisfy the following conditions: q Li ＝Q full -Q n . Referring to Table 1, the lithium deposition capacity Q Li May be 70.994mAh.
After determining the lithium analysis capacity of the battery cell according to the second capacity and the first capacity, the battery management system may detect whether the lithium analysis capacity is greater than a preset capacity threshold. If the lithium analysis capacity is larger than the preset capacity threshold, prompt information can be sent, and the prompt information is used for prompting that the lithium analysis capacity of the battery cell is larger than the preset capacity threshold. The preset capacity threshold value can be stored in the battery management system in advance.
When the lithium analysis capacity is larger than the preset capacity threshold, prompt information is sent, so that before the battery cell leaves the factory, a worker can determine whether the battery cell can leave the factory according to the lithium analysis capacity. And whether to continue using the battery can be determined according to the lithium analysis capacity during the use process of the user after the factory shipment.
In the embodiment of the disclosure, the lithium analysis capacity of the battery cell can be determined by detecting the negative electrode potential, and compared with the method of detecting the lithium analysis capacity by adopting a gas chromatography titration method or an ICP (inductively coupled plasma) method and the like in the related art, the method provided by the embodiment of the disclosure can realize nondestructive detection without disassembling the battery cell, can obtain the lithium analysis capacity in real time, and improves the efficiency and the accuracy of the lithium analysis capacity detection.
And step 408, determining the lithium analysis degree of the battery cell according to the lithium analysis capacity.
After determining the lithium deposition capacity of the battery cell according to the second capacity and the first capacity, the battery management system may determine a lithium deposition degree of the battery cell according to the lithium deposition capacity, where the lithium deposition degree is positively correlated with the lithium deposition capacity. Therefore, the lithium analysis degree of the battery cell can be accurately and efficiently predicted.
And step 409, determining one or more of the charge state of the battery cell, the aging state of the battery cell and the safety state of the battery cell according to the lithium analysis capacity.
After determining the lithium analysis capacity of the cell according to the second capacity and the first capacity, the battery management system may further determine one or more of a state of charge of the cell, an aging state of the cell, and a safety state of the cell according to the lithium analysis capacity. Therefore, one or more of the state of charge of the battery cell, the aging state of the battery cell and the safety state of the battery cell can be accurately and efficiently predicted.
In summary, the embodiments of the present disclosure provide a method for detecting lithium deposition from a battery cell, in which a battery management system may detect a negative electrode potential of the battery cell during charging of the battery, and if the detected negative electrode potential is less than or equal to a reference potential, it may be determined that the battery cell starts to deposit lithium, where the reference potential is less than zero volts. The method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, and accords with the thermodynamic explanation of the lithium analysis process of the battery cell, so the accuracy of the lithium analysis detection of the battery cell is improved.
The following is a process for preparing a three-electrode cell, which may include the steps of:
and A1, preparing a reference electrode.
Soaking the copper wire in concentrated sulfuric acid for 50 minutes (min), then washing the copper wire with deionized water for three times, washing the copper wire with ethanol for three times, and drying to remove an oxide layer on the surface of the copper wire. And then observing whether the oxide layer on the surface of the copper wire is completely removed under the CCD, and if not, repeating the process of removing the oxide layer until the oxide layer on the surface of the copper wire is completely removed. Wherein the diameter of the copper wire is about 6 micrometers (mum).
A2, preparing a positive pole piece
The cathode material NCM811, a conductive agent (such as carbon black), a binder and N-methylpyrrolidone (NMP) are mixed according to the weight ratio of 67.34:3.0:2.7:25, stirring and mixing uniformly to obtain the anode slurry. And then uniformly coating the positive electrode slurry on a positive electrode current collector, and drying, cold pressing and cutting to obtain the positive electrode piece. The binder may be polyvinylidene fluoride (PVDF).
A3, preparing a negative pole piece
Mixing active substance artificial graphite, a conductive agent (such as carbon black) and a binder according to a weight ratio of 96.0:2.0:2.0 is dissolved in a solvent (such as deionized water), and the negative electrode slurry is prepared after uniform mixing. And uniformly coating the negative electrode slurry on a copper foil of a negative current collector for one time or multiple times, and drying, cold pressing and slitting to obtain a negative electrode pole piece. The prepared negative electrode has graphite capacity lower than that of the positive electrode, and conditions are created for lithium separation of the overcharged negative electrode. The binder is polyvinylidene fluoride.
A4, preparing electrolyte
In an argon atmosphere glove box (H) 2 O<0.1ppm，O 2 <0.1 ppm), uniformly mixing organic solvent Ethylene Carbonate (EC)/Ethyl Methyl Carbonate (EMC) according to the volume ratio of 3/7, adding 12.5 percent LiPF6 lithium salt to dissolve in the organic solventAnd stirring uniformly to obtain the electrolyte.
And A5, using the polypropylene film as a separation film.
A6, preparing three electrodes
The materials prepared in the steps are assembled into a laminated battery, and the laminated battery sequentially comprises a positive pole piece, an isolating membrane, a negative pole piece, an isolating membrane, a reference electrode, an isolating membrane and a positive pole piece.
A7, lithium plating of the reference electrode
The positive electrode of the cell was connected to a reference electrode, and the cell was charged for two hours using a current of 10 microamperes (μ a) so that the side of the reference electrode adjacent to the positive electrode was plated with lithium. Similarly, the negative electrode of the cell was connected to a reference electrode, and the cell was charged for two hours with a current of 10 μ a, so that the side of the reference electrode close to the negative electrode was plated with lithium. The whole lithium plating process is completed.
A8, checking three electrodes
And detecting positive and negative electrode voltages V1, positive and reference voltages V2 and reference electrode and negative electrode voltages V3 by using a universal meter, if V1= V2+ V3, the three electrodes of the battery cell are normal, continuing to perform the next test, and otherwise, preparing the three electrodes again.
And A9, monitoring the first potential of the negative electrode and the second potential of the reference electrode.
During charging and discharging of the battery, a first potential of the negative electrode and a second potential of the reference electrode are monitored. And charging the battery cell to 4.2V at a constant current of 1/3C at 25 ℃ (DEG C), standing for 5min, discharging to 2.8V at 1/3C, and detecting the first potential of the negative electrode and the second potential of the reference electrode in real time in the process, thereby realizing real-time monitoring of the negative electrode potential of the battery cell, wherein the change process of the negative electrode potential can be shown in fig. 1 and fig. 2.
The embodiment of the present disclosure provides a computer-readable storage medium, on which a battery cell lithium analysis detection program is stored, and when the battery cell lithium analysis detection program is executed by a processor, the method of the embodiment is implemented. For example, the cell lithium analysis detection method shown in fig. 1 or fig. 2.
Fig. 5 is a schematic structural diagram of a battery management system according to an embodiment of the present disclosure, as shown in fig. 5, the battery management system includes a memory 501, a processor 502, and a battery analysis lithium detection program that is stored in the memory 501 and is executable on the processor 502, and when the processor 502 executes the battery analysis lithium detection program, the method according to the foregoing embodiment is implemented. For example, the cell lithium analysis detection method shown in fig. 1 or fig. 2.
Fig. 6 is a block diagram of a battery cell lithium deposition detection apparatus provided in an embodiment of the present disclosure, and as shown in fig. 6, the apparatus includes:
the detection module 601 is configured to detect a negative electrode potential of a battery cell of a battery during charging of the battery;
a first determining module 602, configured to determine that the battery cell starts to extract lithium when the detection module detects that the negative electrode potential is less than or equal to a reference potential, where the reference potential is less than zero volts.
Optionally, the electric core is a three-electrode electric core, and referring to fig. 7, the detection module 601 includes:
a first determining submodule 6011 configured to determine a first potential of the negative electrode of the cell and a second potential of the reference electrode.
A second determining submodule 6012 configured to determine the cathode potential based on the first potential and the second potential.
Optionally, the first determining submodule 6011 is configured to:
the difference between the first potential and the second potential is determined as the negative electrode potential.
Referring to fig. 8, the apparatus may further include: an alarm module 603 configured to:
and when the battery cell is determined to begin to analyze lithium, sending alarm information, wherein the alarm information is used for prompting the battery cell to analyze lithium.
Referring to fig. 8, the apparatus may further include:
a second determining module 604, configured to determine the first capacity of the cell when the negative electrode potential is less than or equal to the reference potential after determining that the cell starts to perform lithium extraction, and determine the second capacity of the cell when the charging voltage of the cell reaches the cutoff voltage.
And a third determining module 605, configured to determine the lithium deposition capacity of the cell according to the second capacity and the first capacity.
Optionally, the third determining module 605 is configured to:
and determining the difference value between the second capacity and the first capacity as the lithium precipitation capacity of the battery cell.
Referring to fig. 8, the apparatus may further include:
a fourth determining module 606 for:
after the lithium separation capacity of the battery cell is determined according to the second capacity and the first capacity, the lithium separation degree of the battery cell is determined according to the lithium separation capacity.
Optionally, the fourth determining module 606 is further configured to, after determining the lithium separation capacity of the cell according to the second capacity and the first capacity, determine one or more of a state of charge of the cell, an aging state of the cell, and a safety state of the cell according to the lithium separation capacity.
Referring to fig. 8, the apparatus may further include:
the prompt module 607 is configured to, after determining the lithium analysis capacity of the battery cell according to the second capacity and the first capacity, send a prompt message if the lithium analysis capacity is greater than a preset capacity threshold.
To sum up, the embodiment of the present disclosure provides a battery cell lithium deposition detection apparatus, in which a battery management system may detect a negative electrode potential of a battery cell of a battery during a battery charging process, and if the negative electrode potential is detected to be less than or equal to a reference potential, it may be determined that the battery cell starts to deposit lithium, where the reference potential is less than zero volts. The method fully considers the microscopic process of lithium analysis of the battery cell, is more fit with the actually measured data of a laboratory, and accords with the thermodynamic explanation of the lithium analysis process of the battery cell, so the accuracy of the lithium analysis detection of the battery cell is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the terms "optional," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer 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.
In the description of the present disclosure, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the disclosure and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the disclosure.
Furthermore, the terms "first", "second", and the like, used in the embodiments of the present disclosure are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the embodiments. Thus, a feature defined in an embodiment of the present disclosure as "first," "second," etc. may, either explicitly or implicitly, mean that at least one of the feature is included in the embodiment. In the description of the present disclosure, the word "plurality" means at least two or two and more, such as two, three, four, etc., unless specifically limited otherwise in the examples.
In the present disclosure, unless otherwise explicitly stated or limited in relation to the embodiments, the terms "mounted," "connected," and "fixed" in the embodiments shall be construed broadly, for example, the connection may be a fixed connection, a detachable connection, or an integral body, and it may be understood that it may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. The specific meaning of the above terms in this disclosure can be understood by one of ordinary skill in the art based on the specific implementation.
In the present disclosure, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.
Claims (11)
1. A method for detecting lithium evolution from a battery cell, the method comprising:
detecting the negative electrode potential of a battery cell of a battery in the process of charging the battery;
and if the detected potential of the negative electrode is less than or equal to a reference potential, determining that the battery cell begins to analyze lithium, wherein the reference potential is less than zero volt.
2. The method of claim 1, wherein the cell is a three-electrode cell, and wherein detecting the negative electrode potential of the cell of the battery comprises:
determining a first potential of a negative electrode of the cell and a second potential of a reference electrode;
and determining the cathode potential according to the first potential and the second potential.
3. The method of claim 2, wherein said determining the negative electrode potential from the first potential and the second potential comprises:
determining a difference between the first potential and the second potential as the negative electrode potential.
4. The method of any of claims 1 to 3, wherein upon the determination that the cell begins to evolve lithium, the method further comprises:
and sending alarm information, wherein the alarm information is used for prompting the battery cell to analyze lithium.
5. The method of any of claims 1 to 3, wherein after determining that the cell begins to extract lithium, the method further comprises:
determining a first capacity of the battery cell when the negative electrode potential is less than or equal to a reference potential, and determining a second capacity of the battery cell when a charge voltage of the battery cell reaches a cutoff voltage;
and determining the lithium precipitation capacity of the battery cell according to the second capacity and the first capacity.
6. The method of claim 5, wherein the determining the lithium extraction capacity of the cell from the second capacity and the first capacity comprises:
determining the difference between the second capacity and the first capacity as the lithium precipitation capacity of the battery cell.
7. The method of claim 5, wherein after the determining the lithium extraction capacity of the cell from the second capacity and the first capacity, the method further comprises:
determining one or more of a state of charge of the cell, an aging state of the cell, and a safety state of the cell from the lithium evolution capacity.
8. The method of claim 5, wherein after the determining the lithium extraction capacity of the cell from the second capacity and the first capacity, the method further comprises:
and if the lithium analysis capacity is larger than a preset capacity threshold value, sending a prompt message.
9. A computer-readable storage medium having stored thereon a cell analysis lithium detection program which, when executed by a processor, implements the method according to any one of claims 1 to 8.
10. A battery management system comprising a memory, a processor, and a cell lithium analysis detection program stored in the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 8 when executing the cell lithium analysis detection program.
11. An electrical lithium extraction detection device, the device comprising:
the detection module is used for detecting the negative electrode potential of the battery cell of the battery in the process of charging the battery;
and the determining module is used for determining that the battery cell starts to analyze lithium when the detecting module detects that the negative electrode potential is less than or equal to a reference potential, wherein the reference potential is less than zero volt.
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| CN116559757A (en) * | 2023-07-04 | 2023-08-08 | 江苏天合储能有限公司 | Verification method and device for battery lithium-precipitation potential prediction accuracy and electronic equipment |
| CN116559757B (en) * | 2023-07-04 | 2023-10-27 | 江苏天合储能有限公司 | Verification method and device for battery lithium-precipitation potential prediction accuracy and electronic equipment |
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