CN109675837B - Battery screening method, device, equipment and storage medium - Google Patents
Battery screening method, device, equipment and storage medium Download PDFInfo
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- 238000012216 screening Methods 0.000 title claims abstract description 59
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- 238000003860 storage Methods 0.000 title claims abstract description 16
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- 238000012360 testing method Methods 0.000 claims description 23
- 238000001453 impedance spectrum Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 9
- 238000012797 qualification Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000627 alternating current impedance spectroscopy Methods 0.000 description 8
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- 229910001416 lithium ion Inorganic materials 0.000 description 2
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- 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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- 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
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Abstract
The invention discloses a battery screening method, a battery screening device, battery screening equipment and a storage medium. The method comprises the following steps: acquiring an impedance value of a battery to be tested at a first preset frequency; and determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and a preset impedance range, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity under a first preset frequency. The embodiment of the invention can screen out the battery with potential poor internal resistance, avoid the battery from flowing into the market to cause quality problems, improve the quality of the delivered products, reduce the storage and placement time in production, save time, improve the production efficiency, and simultaneously has simple operation and strong practicability.
Description
Technical Field
The embodiment of the invention relates to the field of battery detection, in particular to a battery screening method, a battery screening device, battery screening equipment and a storage medium.
Background
Lithium ion batteries have been successfully used in the fields of electronic devices, new energy vehicles, etc. because of their high specific energy, high specific power, long service life, wide working range, etc.
In the production process of the lithium ion battery, a plurality of manufacturing links (such as the quality of a pole plate, the welding in the winding process of a pole group, the welding in the assembling process of a battery core, the liquid injection amount, the quality of parts and the like) have influence on the internal resistance of a battery product, and the failure of a client product caused by the inflow of the battery to a client end finally causes complaints and cost loss.
Currently, most companies adopt a 1kHz alternating current impedance test to judge whether the internal resistance of the battery is qualified or not, and then screening is carried out according to the internal resistance. However, the static internal resistance of the battery is only detected in this way, the current internal resistance of the battery can only be detected by the current screening method, the internal resistance of the battery changes along with the change of time after the battery leaves a factory, and the method cannot detect the potential battery with poor internal resistance. In the prior art, batteries are also stored for a period of time, then internal resistance is detected, and screening is performed. However, the method has high cost, long time consumption and low efficiency.
Disclosure of Invention
The invention provides a battery screening method, a battery screening device, battery screening equipment and a storage medium, which are used for screening out batteries with potential unqualified internal resistance and improving the product quality.
In a first aspect, an embodiment of the present invention provides a battery screening method, including:
acquiring an impedance value of a battery to be tested at a first preset frequency;
and determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and a preset impedance range, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity under a first preset frequency.
Optionally, the determining whether the internal resistance of the battery to be tested is qualified based on the impedance value and a preset impedance range includes:
if the impedance value is within the preset impedance range, determining the internal resistance of the battery to be tested as unqualified;
and if the impedance value is out of the preset impedance range, determining the internal resistance of the battery to be tested to be qualified.
Optionally, before the obtaining the impedance value of the battery to be tested at the first preset frequency, the method further includes:
determining the preset impedance range.
Optionally, the determining the preset impedance range includes:
obtaining impedance values of a plurality of batteries with the same nominal capacity at a first preset frequency;
aging the plurality of batteries with the same nominal capacity;
obtaining internal resistances of the batteries with the same nominal capacity, wherein the internal resistances are obtained by performing alternating current impedance spectrum test on the batteries at a second preset frequency, and the first preset frequency is greater than the second preset frequency;
and if the battery internal resistance of which the resistance value is in the first resistance range is unqualified, determining that the first resistance range is the preset resistance range.
Optionally, the first preset frequency is 1MHz, and the second preset frequency is 1 KHz.
In a second aspect, an embodiment of the present invention further provides a battery screening apparatus, including:
the impedance value acquisition module is used for acquiring the impedance value of the battery to be tested at a first preset frequency;
and the internal resistance qualification determining module is used for determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and a preset impedance range under a first preset frequency, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity under the first preset frequency.
Optionally, the battery screening apparatus further includes an impedance range determination module, configured to determine the preset impedance range before obtaining the impedance value of the battery to be tested at the first preset frequency.
Optionally, the impedance range determining module includes:
the impedance value acquisition unit is used for acquiring the impedance values of a plurality of batteries with the same nominal capacity under a first preset frequency;
the aging processing unit is used for performing aging processing on the batteries with the same nominal capacity;
the battery internal resistance obtaining unit is used for obtaining internal resistances of the batteries with the same nominal capacity, the internal resistances are obtained by performing alternating current impedance spectrum test on the batteries at a second preset frequency, and the first preset frequency is greater than the second preset frequency;
and the impedance range determining unit is used for determining that the first impedance range is the preset impedance range when the internal resistance of the battery with the impedance value in the first impedance range is unqualified.
In a third aspect, an embodiment of the present invention further provides a battery screening apparatus, including:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a battery screening method according to any of the first aspects of the invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the battery screening method according to any of the first aspects of the present invention.
According to the embodiment of the invention, whether the internal resistance of the battery to be tested is qualified is determined by obtaining the impedance value of the battery to be tested at the first preset frequency based on the impedance value and the preset impedance range, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at the first preset frequency.
Drawings
Fig. 1 is a flowchart of a battery screening method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another battery screening method provided by the present invention;
fig. 3 is a schematic structural diagram of a battery screening apparatus according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to a third embodiment of the present invention.
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
An embodiment of the present invention provides a battery screening method, which is applied to screen out a battery with potentially unacceptable internal resistance, and fig. 1 is a flowchart of the battery screening method provided in the embodiment of the present invention, as shown in fig. 1, the battery screening method includes:
s110, obtaining an impedance value of the battery to be tested at a first preset frequency.
Illustratively, the electrochemical alternating-current impedance spectrum test is carried out on the battery to be detected, and the impedance value of the battery to be detected under the high-frequency alternating-current signal is obtained. The electrochemical ac impedance spectrum may be measured using one of an electrochemical workstation or an ac impedance tester. The electrochemical alternating current impedance spectrum test is to inject small-amplitude sine wave current or voltage signal as an excitation source into a battery to be tested, and calculate the impedance value of the battery by measuring the response signal of the battery. Because the impedance value difference of each battery is very small under the alternating current signal of 1KHz, namely the impedance value difference of the battery with qualified internal resistance and the battery with unqualified potential internal resistance is very small under the alternating current signal of 1KHz, when the battery impedance value under the frequency is adopted to screen the batteries, the battery with unqualified potential internal resistance cannot be screened, and the battery with unqualified potential internal resistance is taken as the qualified battery to flow into the market. After the battery leaves a factory, the internal resistance of the battery changes along with the change of time, so that potential internal resistance is unqualified and the quality problem is caused. In the embodiment of the invention, the impedance value of the battery to be tested is measured under the high-frequency alternating current signal, and the impedance value of each battery is obviously different under the high-frequency alternating current signal, such as a 1MHz alternating current signal. The first preset frequency may be determined according to the electrochemical ac impedance spectroscopy test result, for example, the electrochemical ac impedance spectroscopy test is performed on a plurality of batteries with the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the batteries are obviously different. The batteries with the same nominal capacity are the batteries with the same specification, the same capacity and the same electric quantity state. For example, the frequency of the alternating current signal is widened to 0.1Hz-1MHz, and the impedance values of the batteries are obviously different under the frequency of 1MHz, so that the first preset frequency can be determined to be 1 MHz.
And S120, determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and the preset impedance range.
The preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at a first preset frequency. Illustratively, electrochemical ac impedance spectroscopy tests are performed on a plurality of cells of the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the cells are obviously different. The batteries with the same nominal capacity are the batteries with the same specification, the same capacity and the same electric quantity state. For example, the frequency of the alternating current signal is widened to 0.1Hz-1MHz, the impedance values of the batteries are obviously different under the frequency of 1MHz, and the impedance distribution of the batteries with the same nominal capacity under the frequency of 1MHz is obtained. And determining a preset impedance range based on the impedance distribution of a plurality of batteries with the same nominal capacity under the frequency of 1 MHz. For example, through a large number of experiments, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is smaller than 1900m Ω, and the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is larger than 1930m Ω. For example, the preset impedance range may be determined to be larger than 1930m Ω, after the preset impedance range is determined, whether the impedance value of the battery to be tested at the first preset frequency is within the preset impedance range is determined, and if so, it is determined that the battery to be tested has potential internal resistance defect and is an unqualified product, and then the battery is screened. For example, it may also be determined that the preset impedance range is smaller than 1900m Ω, and it is determined whether the impedance value of the battery to be tested at the first preset frequency is within the preset impedance range, if so, the battery to be tested is determined to be a qualified product, and then the screening of the battery is implemented.
According to the embodiment of the invention, whether the internal resistance of the battery to be tested is qualified is determined by obtaining the impedance value of the battery to be tested at the first preset frequency based on the impedance value and the preset impedance range, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at the first preset frequency.
Optionally, step S120, determining whether the internal resistance of the battery to be tested is qualified based on the impedance value and the preset impedance range, includes:
if the impedance value is within the preset impedance range, determining the internal resistance of the battery to be tested as unqualified;
and if the impedance value is out of the preset impedance range, determining the internal resistance of the battery to be tested to be qualified.
Exemplarily, determining that the preset impedance range is larger than 1930m Ω, after the preset impedance range is determined, judging whether the impedance value of the battery to be tested at the first preset frequency is within the preset impedance range, and if the impedance value is within the preset impedance range, determining that the battery to be tested has potential poor internal resistance and is an unqualified product; and if the impedance value is out of the preset impedance range, determining the internal resistance of the battery to be tested to be qualified.
Optionally, before the step S110, obtaining the impedance value of the battery to be tested at the first preset frequency, the method further includes:
a preset impedance range is determined.
On the basis of the above embodiment, in order to improve the precision of the preset impedance range and improve the screening accuracy, the preset impedance range needs to be determined.
Optionally, determining the preset impedance range includes:
obtaining impedance values of a plurality of batteries with the same nominal capacity at a first preset frequency;
aging a plurality of batteries with the same nominal capacity;
obtaining internal resistances of a plurality of batteries with the same nominal capacity, wherein the internal resistances are obtained by performing alternating current impedance spectrum test on the batteries at a second preset frequency, and the first preset frequency is greater than the second preset frequency;
and if the battery internal resistance with the impedance value in the first impedance range is unqualified, determining that the first impedance range is a preset impedance range.
Correspondingly, another battery screening method is provided in the embodiment of the present invention, fig. 2 is a flowchart of another battery screening method provided in the present invention, and as shown in fig. 2, the battery screening method includes:
s210, obtaining impedance values of a plurality of batteries with the same nominal capacity at a first preset frequency.
Illustratively, electrochemical ac impedance spectroscopy tests are performed on a plurality of cells of the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the cells are obviously different. As shown in fig. 2, for example, the frequency of the ac signal is widened to 0.1Hz to 1MHz, and the impedance values of the batteries are significantly different at the frequency of 1MHz, so as to obtain the impedance distribution of the batteries with the same nominal capacity at the frequency of 1 MHz.
And S220, aging the plurality of batteries with the same nominal capacity.
For example, the battery is subjected to accelerated aging treatment, specifically, the battery is subjected to constant temperature aging, high and low temperature impact aging or vibration aging to simulate the use environment of the battery, so that potential internal resistance poor performance is shown. It should be noted that the aging treatment for the battery in the embodiment of the present invention is not limited to the aging treatment means described in the embodiment, as long as the rated purpose of the embodiment of the present invention can be achieved, that is, the potential internal resistance failure can be expressed.
And S230, acquiring internal resistances of a plurality of batteries with the same nominal capacity.
The internal resistance is obtained by testing the alternating current impedance spectrum of the battery under a second preset frequency, and the first preset frequency is greater than the second preset frequency. After the accelerated aging treatment, potential internal resistance defects are shown, for example, an electrochemical alternating current impedance spectrum test is performed on a plurality of batteries with the same nominal capacity to obtain the internal resistance of the battery under an alternating current signal of a second preset frequency, so that whether the internal resistance of the battery is qualified or not can be determined, wherein the second preset frequency is 1 KHz.
S240, if the battery internal resistance with the resistance value within the first resistance range is unqualified, determining that the first resistance range is a preset resistance range.
For example, through a large number of experiments, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is obviously different from the impedance value of the battery with potential poor internal resistance at the frequency of 1MHz, for example, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is smaller than 1900m Ω, the impedance value of the battery with potential poor internal resistance at the frequency of 1MHz is larger than 1930m Ω, the first impedance range is preliminarily determined to be larger than 1930m Ω, and if the impedance values of the plurality of batteries at the first preset frequency are all within the first impedance range and the internal resistance of the battery is unqualified, the first impedance range is determined to be the preset impedance range. It should be noted that the first impedance range may be selected by multiple trials, and the preset impedance range is further gradually narrowed.
And S250, acquiring an impedance value of the battery to be tested at a first preset frequency.
And S260, determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and the preset impedance range. The preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at a first preset frequency.
The following table is a table of impedances before and after aging treatment provided by the embodiments of the present invention.
As shown in the table, before aging treatment, the internal resistance of each battery does not exceed 50m omega under the condition of 1KHz alternating current signals, and the batteries are screened by using a traditional screening method and are all regarded as qualified products. However, after aging treatment, the internal resistance of each battery is obviously different under the 1KHz alternating current signal, potential internal resistance defects are shown, and the internal resistance of the batteries with sample numbers ES5, ES8, ES15, ES16 and ES17 exceeds 60m omega, so that the batteries are unqualified products. Accordingly, the batteries with impedance values of more than 1934.7m Ω exist potential internal resistance defects under the alternating current signal of 1MHz before the aging treatment, so that the preset impedance range can be determined to be more than 1934.7m Ω. In the screening process, the battery to be tested is subjected to electrochemical test to obtain the impedance value of the battery to be tested under the alternating current signal of 1MHz, and if the impedance value is greater than or equal to 1934.7m omega, the potential internal resistance of the battery to be tested can be determined to be poor.
It should be noted that, the accuracy of the preset impedance range can be improved by increasing the number of test samples, so as to improve the accuracy of the screening.
Example two
A second embodiment of the present invention provides a battery screening apparatus, and fig. 3 is a schematic structural diagram of the battery screening apparatus provided in the second embodiment of the present invention, and as shown in fig. 3, the apparatus includes an impedance value obtaining module 310 and an internal resistance qualification determining module 320.
The impedance value obtaining module 310 is configured to obtain an impedance value of the battery to be tested at a first preset frequency.
For example, the electrochemical alternating current impedance spectrum test is performed on the battery to be tested, and the impedance value obtaining module 310 obtains the impedance value of the battery to be tested under the high-frequency alternating current signal. The electrochemical ac impedance spectrum may be measured using one of an electrochemical workstation or an ac impedance tester. The electrochemical alternating current impedance spectrum test is to inject small-amplitude sine wave current or voltage signal as an excitation source into a battery to be tested, and calculate the impedance value of the battery by measuring the response signal of the battery. Because the impedance value difference of each battery is very small under the alternating current signal of 1KHz, namely the impedance value difference of the battery with qualified internal resistance and the battery with unqualified potential internal resistance is very small under the alternating current signal of 1KHz, when the battery impedance value under the frequency is adopted to screen the batteries, the battery with unqualified potential internal resistance cannot be screened, and the battery with unqualified potential internal resistance is taken as the qualified battery to flow into the market. After the battery leaves a factory, the internal resistance of the battery changes along with the change of time, so that potential internal resistance is unqualified and the quality problem is caused. In the embodiment of the invention, the impedance value of the battery to be tested is measured under the high-frequency alternating current signal, and the impedance value of each battery is obviously different under the high-frequency alternating current signal, such as a 1MHz alternating current signal. The first preset frequency may be determined according to the electrochemical ac impedance spectroscopy test result, for example, the electrochemical ac impedance spectroscopy test is performed on a plurality of batteries with the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the batteries are obviously different. The batteries with the same nominal capacity are the batteries with the same specification, the same capacity and the same electric quantity state. For example, the frequency of the alternating current signal is widened to 0.1Hz-1MHz, and the impedance values of the batteries are obviously different under the frequency of 1MHz, so that the first preset frequency can be determined to be 1 MHz.
The internal resistance qualification determining module 320 is configured to determine whether the internal resistance of the battery to be tested is qualified based on the impedance value and a preset impedance range at the first preset frequency, where the preset impedance range is obtained based on impedance distribution of the plurality of batteries with the same nominal capacity at the first preset frequency. The preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at a first preset frequency. As shown in fig. 2, for example, electrochemical ac impedance spectroscopy tests are performed on a plurality of cells with the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the cells are obviously different. The batteries with the same nominal capacity are the batteries with the same specification, the same capacity and the same electric quantity state. For example, the frequency of the alternating current signal is widened to 0.1Hz-1MHz, the impedance values of the batteries are obviously different under the frequency of 1MHz, and the impedance distribution of the batteries with the same nominal capacity under the frequency of 1MHz is obtained. And determining a preset impedance range based on the impedance distribution of a plurality of batteries with the same nominal capacity under the frequency of 1 MHz. For example, through a large number of experiments, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is smaller than 1900m Ω, and the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is larger than 1930m Ω. For example, the preset impedance range may be determined to be greater than 1930m Ω, after the preset impedance range is determined, the internal resistance qualification determining module 320 determines whether the impedance value of the battery to be tested at the first preset frequency is within the preset impedance range, and if so, determines that the battery to be tested has potential poor internal resistance and is a non-qualified product, thereby screening the battery. For example, it may also be determined that the preset impedance range is smaller than 1900m Ω, and it is determined whether the impedance value of the battery to be tested at the first preset frequency is within the preset impedance range, if so, the battery to be tested is determined to be a qualified product, and then the screening of the battery is implemented.
According to the battery screening device provided by the embodiment of the invention, the impedance value of the battery to be tested at the first preset frequency is obtained through the impedance value obtaining module, the internal resistance qualification determining module determines whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and the preset impedance range, and the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity at the first preset frequency.
Optionally, the battery screening apparatus further includes an impedance range determining module 330, configured to determine a preset impedance range before obtaining an impedance value of the battery to be tested at the first preset frequency. On the basis of the above embodiment, in order to improve the precision of the preset impedance range and improve the screening accuracy, the impedance range determining module 330 is required to determine the preset impedance range.
Optionally, the impedance range determining module includes:
the impedance value obtaining unit 331 is configured to obtain impedance values of a plurality of batteries with the same nominal capacity at a first preset frequency. Illustratively, electrochemical ac impedance spectroscopy tests are performed on a plurality of cells of the same nominal capacity, and the frequency range of the ac signal is gradually widened until the impedance values of the cells are obviously different. As shown in fig. 2, for example, when the frequency of the ac signal is widened to 0.1Hz to 1MHz, the impedance values of the batteries are significantly different at the frequency of 1MHz, and the impedance value acquiring unit 331 acquires the impedance distribution of the batteries of the same nominal capacity at the frequency of 1 MHz.
And an aging processing unit 332 for performing aging processing on a plurality of batteries with the same nominal capacity. For example, the aging processing unit 332 performs accelerated aging processing on the battery, and specifically may perform constant temperature aging, high and low temperature impact aging or vibration aging on the battery to simulate the use environment of the battery, so that the potential internal resistance is poor. It should be noted that the aging treatment for the battery in the embodiment of the present invention is not limited to the aging treatment means described in the embodiment, as long as the rated purpose of the embodiment of the present invention can be achieved, that is, the potential internal resistance failure can be expressed.
The battery internal resistance obtaining unit 333 is configured to obtain internal resistances of a plurality of batteries with the same nominal capacity, where the internal resistances are obtained by performing an ac impedance spectrum test on the batteries at a second preset frequency, and the first preset frequency is greater than the second preset frequency. After the accelerated aging process, potential internal resistance defects may be shown, for example, an electrochemical ac impedance spectrum test is performed on a plurality of batteries with the same nominal capacity, and the battery internal resistance obtaining unit 333 obtains the internal resistance of the battery under the ac signal of the second preset frequency, so as to determine whether the internal resistance of the battery is qualified, where the second preset frequency is typically 1 KHz.
The impedance range determination unit 334 is configured to determine that the first impedance range is the preset impedance range when the internal resistance of the battery with the impedance value in the first impedance range is unqualified. For example, through a large number of experiments, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is obviously different from the impedance value of the battery with potential poor internal resistance at the frequency of 1MHz, for example, the impedance value of the battery with qualified internal resistance at the frequency of 1MHz is smaller than 1900m Ω, the impedance value of the battery with potential poor internal resistance at the frequency of 1MHz is larger than 1930m Ω, the impedance range determining unit 334 preliminarily determines that the first impedance range is larger than 1930m Ω, and if the impedance values of the plurality of batteries at the first preset frequency are all in the first impedance range and the internal resistance of the battery is unqualified, the first impedance range is determined to be the preset impedance range.
EXAMPLE III
Third embodiment of the present invention provides a battery screening apparatus, fig. 4 is a schematic structural diagram of a computer apparatus provided in third embodiment of the present invention, as shown in fig. 4, the computer apparatus includes a processor 10, a memory 11, a communication module 12, an input device 13, and an output device 14; the number of processors 10 in the system may be one or more, and one processor 10 is taken as an example in fig. 4; the processor 10, the memory 11, the communication module 12, the input device 13 and the output device 14 in the system may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.
The memory 11 is used as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as a module corresponding to a battery screening method in the present embodiment (for example, an impedance value acquisition module in a battery screening apparatus). The processor 10 executes various functional applications of the device and data processing by running software programs, instructions and modules stored in the memory 11, so as to realize the elevator screening method.
The memory 11 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the system, and the like. Further, the memory 11 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 11 may further include memory located remotely from processor 10, which may be connected to the system over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
And the communication module 12 is used for establishing connection with the display screen and realizing data interaction with the display screen. The input device 13 may be used to receive input numeric or character information and to generate key signal inputs relating to user settings and function controls of the system.
The battery screening device provided by the embodiment of the invention can execute the battery screening method provided by the above embodiment of the invention, and has corresponding functions and beneficial effects.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the battery screening method according to any of the above aspects of the present invention.
Of course, the computer-readable storage medium provided by the embodiments of the present invention has computer-executable instructions that are not limited to the operations of the method described above, and may also perform related operations in the battery screening method provided by any of the above-described embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the battery screening apparatus, the included units and modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
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 (7)
1. A battery screening method, comprising:
determining a preset impedance range;
acquiring an impedance value of a battery to be tested at a first preset frequency;
determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and a preset impedance range, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity under a first preset frequency;
obtaining impedance values of a plurality of batteries with the same nominal capacity at a first preset frequency;
aging the plurality of batteries with the same nominal capacity;
obtaining internal resistances of the batteries with the same nominal capacity, wherein the internal resistances are obtained by performing alternating current impedance spectrum test on the batteries at a second preset frequency;
if the battery internal resistance of which the impedance value is in a first impedance range is unqualified, determining that the first impedance range is the preset impedance range;
the determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and the preset impedance range comprises the following steps:
if the impedance value is within the preset impedance range, determining the internal resistance of the battery to be tested as unqualified;
and if the impedance value is out of the preset impedance range, determining the internal resistance of the battery to be tested to be qualified.
2. The battery screening method of claim 1, wherein the first predetermined frequency is greater than the second predetermined frequency.
3. The battery screening method of claim 2, wherein the first predetermined frequency is 1MHz and the second predetermined frequency is 1 KHz.
4. A battery screening apparatus, comprising:
the impedance range determining module is used for determining a preset impedance range before acquiring an impedance value of the battery to be tested at a first preset frequency;
the impedance value acquisition module is used for acquiring the impedance value of the battery to be tested at a first preset frequency;
the internal resistance qualification determining module is used for determining whether the internal resistance of the battery to be tested is qualified or not based on the impedance value and a preset impedance range under a first preset frequency, if the impedance value is within the preset impedance range, determining that the internal resistance of the battery to be tested is unqualified, and if the impedance value is outside the preset impedance range, determining that the internal resistance of the battery to be tested is qualified, wherein the preset impedance range is obtained based on the impedance distribution of a plurality of batteries with the same nominal capacity under the first preset frequency;
the impedance range determination module includes:
the impedance value acquisition unit is used for acquiring the impedance values of a plurality of batteries with the same nominal capacity under a first preset frequency;
the aging processing unit is used for performing aging processing on the batteries with the same nominal capacity;
the battery internal resistance obtaining unit is used for obtaining internal resistances of the batteries with the same nominal capacity, wherein the internal resistances are obtained by performing alternating current impedance spectrum test on the batteries at a second preset frequency;
and the impedance range determining unit is used for determining that the first impedance range is the preset impedance range when the internal resistance of the battery with the impedance value in the first impedance range is unqualified.
5. The battery screening apparatus of claim 4, wherein the first predetermined frequency is greater than the second predetermined frequency.
6. A battery screening apparatus, comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the battery screening method of any of claims 1-3.
7. A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, carries out a battery screening method according to any one of claims 1 to 3.
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| CN110308404A (en) * | 2019-07-04 | 2019-10-08 | Oppo广东移动通信有限公司 | A kind of battery screening technique, device and computer readable storage medium |
| CN110412480A (en) * | 2019-07-10 | 2019-11-05 | Oppo广东移动通信有限公司 | Battery screening method, device and computer storage medium and test system |
| CN110806543A (en) * | 2020-01-08 | 2020-02-18 | 杭州华塑加达网络科技有限公司 | Alternating current impedance frequency spectrum obtaining method and device and related components |
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