CN111167748B - Battery screening method - Google Patents
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- CN111167748B CN111167748B CN201911219553.5A CN201911219553A CN111167748B CN 111167748 B CN111167748 B CN 111167748B CN 201911219553 A CN201911219553 A CN 201911219553A CN 111167748 B CN111167748 B CN 111167748B
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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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- 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
- B07C7/00—Sorting by hand only e.g. of mail
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
According to the battery screening method, through carrying out appearance detection, voltage detection and internal resistance detection on the battery in sequence, the battery with unqualified appearance, unqualified voltage and unqualified internal resistance can be removed to obtain the battery qualified by primary screening, then, carrying out primary discharging operation, primary high-temperature aging and standing operation, carrying out appearance detection, voltage detection and internal resistance detection again to obtain the battery qualified by secondary screening, carrying out secondary discharging, secondary high-temperature aging and standing operation on the battery qualified by secondary screening, and finally, carrying out appearance detection, voltage detection and internal resistance detection again in sequence to obtain the battery qualified by tertiary screening. Through twice discharging, twice high-temperature aging and three-time screening, defective batteries are rapidly identified, the fact that the electrical performance of the batteries after production does not change too severely along with the increase of the service time is guaranteed, the batteries obtained through twice discharging, twice high-temperature aging and three-time screening can be reliably guaranteed, and the service life of the batteries can be guaranteed.
Description
Technical Field
The invention relates to the technical field of battery preparation, in particular to a battery screening method.
Background
Currently, a battery refers to a device that converts chemical energy into electrical energy in a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to generate an electric current. Has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy. Such as a solar cell. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery is used as an energy source, so that the current which has stable voltage and stable current, can be stably supplied for a long time and is slightly influenced by the outside can be obtained, and the battery has the advantages of simple structure, convenience in carrying, easiness and convenience in charging and discharging operation, no influence of outside weather and temperature, stable and reliable performance and great effect in various aspects of modern social life.
With the increasing popularity of electronic products, the industry puts new demands on the quality of batteries, namely, the consistency of the batteries. Common problems with batteries are: 1. the surface of the battery has depressions and cracks, so that the battery can leak liquid; 2. the voltage of the battery at the time of production does not reach the rated standard, namely the voltage of the battery can be larger than or smaller than the specified rated voltage; 3. after the battery is stored for a period of time at normal temperature, some situations of voltage drop or internal resistance increase of the battery are easily generated, namely the electrical property of the battery is unstable. For the above problems, the existing manufacturers do not relate to the detection of the electrical performance of the battery during the process of preparing the battery or completing the battery, which often causes the electrical performance of the prepared battery to be very unstable after the prepared battery is produced and sold, the electrical performance of the battery is easy to decline in a short time, so that a user cannot use the battery to the maximum extent when actually using the battery, and the experience of the user is greatly reduced; in addition, the electrical property of the battery is unstable, which also easily causes the damage of the battery and even the explosion in severe cases when the user uses the battery, and because the chemical property of the battery is unstable, if the battery explodes, the explosion may cause the fire risk.
Therefore, it is highly desirable for research and development personnel to develop a battery screening method capable of rapidly identifying defective batteries so as to ensure the electrical performance of the produced batteries.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the battery screening method which can quickly identify the defective batteries, ensure that the electrical property of the produced batteries cannot be changed too much and prolong the service life of the batteries.
The purpose of the invention is realized by the following technical scheme:
a battery screening method, comprising:
step S01, performing appearance detection, voltage detection and internal resistance detection on the battery in sequence, and removing the battery with unqualified appearance detection, unqualified voltage detection or unqualified internal resistance detection to obtain the battery qualified by primary screening;
step S02, discharging the qualified batteries after primary screening for one time at a preset constant current for a preset discharging time, and placing the qualified batteries after primary screening for one time after discharging at a preset temperature for high-temperature aging for a preset time to obtain the qualified batteries after primary high-temperature aging;
step S03, standing the battery subjected to primary high-temperature aging for a preset standing time at normal temperature, and executing the step S01 again on the battery subjected to primary high-temperature aging to obtain the battery qualified by secondary screening;
step S04, carrying out secondary discharge on the qualified secondary screening batteries at a preset constant current for a preset discharge time, and placing the qualified secondary screening batteries after secondary discharge at a preset temperature for high-temperature aging for a preset time to obtain the secondary high-temperature aged batteries;
and S05, standing the secondary high-temperature aged battery again at normal temperature for a preset standing time, and executing the step S01 again on the secondary high-temperature aged battery to obtain the qualified battery after three times of screening.
In one embodiment, in the step S01, the performing the appearance inspection on the battery specifically includes:
whether the battery has the phenomena of recess, crack and liquid leakage or not is visually checked, and if the battery meets at least one of the phenomena, the battery is judged to be the battery with unqualified appearance detection; otherwise, the battery is judged to be qualified through appearance detection.
In one embodiment, in the step S01, the voltage detection on the battery is specifically:
detecting the potential difference between the anode and the cathode of the battery by using a voltage detector to obtain the current battery voltage, and if the current battery voltage is lower than a preset lower limit voltage or higher than a preset upper limit voltage, determining that the battery is the battery with unqualified voltage detection; otherwise, the battery is judged to be qualified through voltage detection.
In one embodiment, the preset lower limit voltage specifically includes a primary screening lower limit voltage, a secondary screening lower limit voltage and a tertiary screening lower limit voltage, the primary screening lower limit voltage is 3V to 3.3V, the secondary screening lower limit voltage is 3.05V to 3.25V, and the tertiary screening lower limit voltage is 3.05V to 3.25V; the preset upper limit voltage comprises a primary screening upper limit voltage, a secondary screening upper limit voltage and a tertiary screening upper limit voltage, wherein the primary screening upper limit voltage is 3.6V-3.8V, the secondary screening upper limit voltage is 3.4V-3.6V, and the tertiary screening upper limit voltage is 3.35V-3.45V;
in the primary screening, the step S01 performs voltage detection on the battery by using the primary screening lower limit voltage and the primary screening upper limit voltage;
in the secondary screening, the step S01 performs voltage detection on the battery by using the secondary screening lower limit voltage and the secondary screening upper limit voltage;
in the third screening, the step S01 performs voltage detection on the battery by using the third screening lower limit voltage and the third screening upper limit voltage.
In one embodiment, before the voltage detection is performed on the battery, a short circuit clearing operation on the voltage detector is further included, where the short circuit clearing operation specifically includes:
and mutually colliding and contacting probes of the voltage detector, and performing short circuit zero clearing operation.
In one embodiment, in the step S01, the detecting the internal resistance of the battery specifically includes:
detecting the internal resistance of the battery by using a voltage detector to obtain the internal resistance value of the battery, and if the internal resistance value of the battery does not fall into a preset internal resistance interval, judging that the battery is the battery with unqualified internal resistance detection; otherwise, the battery is judged to be qualified through internal resistance detection.
In one embodiment, the preset internal resistance interval includes a primary screening internal resistance interval, a secondary screening internal resistance interval and a tertiary screening internal resistance interval, the primary screening internal resistance interval is [100m Ω, 650m Ω ], the secondary screening internal resistance interval is [100m Ω, 1000m Ω ], and the tertiary screening internal resistance interval is [100m Ω, 650m Ω ];
in the primary screening, the step S01 detects the internal resistance of the battery by using the primary screening internal resistance interval;
in the secondary screening, the step S01 performs internal resistance detection on the battery by using the secondary screening internal resistance interval;
in the third screening, the step S01 detects the internal resistance of the battery by using the internal resistance interval of the third screening.
In one embodiment, the preset discharge time is 20s to 360s, and the preset constant current is 400mA to 1200 mA.
In one embodiment, the preset time is 1-100 h, and the preset temperature is 50-80 ℃.
In one embodiment, the preset standing time is 4 to 10 hours.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the battery screening method, through carrying out appearance detection, voltage detection and internal resistance detection on the battery in sequence, the battery with unqualified appearance, unqualified voltage and unqualified internal resistance can be removed to obtain the battery qualified by primary screening, then, carrying out primary discharging operation, primary high-temperature aging and standing operation, carrying out appearance detection, voltage detection and internal resistance detection again to obtain the battery qualified by secondary screening, carrying out secondary discharging, secondary high-temperature aging and standing operation on the battery qualified by secondary screening, and finally, carrying out appearance detection, voltage detection and internal resistance detection again in sequence to obtain the battery qualified by tertiary screening. This application is through twice discharge, twice high temperature ageing and cubic screening, can discern the defective products battery fast, guarantees that the electrical property of the battery after the delivery can not be along with the increase of live time and the too harsh that changes, through twice discharge, twice high temperature ageing and cubic screening the battery that obtains, its life can obtain reliable assurance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow chart illustrating steps of a battery screening method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the voltage trend of batteries with different screening methods after 100 days of high temperature in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the internal resistance trend of the battery with different screening methods after 100 days of high temperature in accordance with an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, after the existing manufacturer finishes producing the battery, it will perform a primary detection on the quality of the battery, so as to screen out the defective battery, and ensure the output quality of the battery. However, in the actual process, the battery is detected once, so that some defective batteries are inevitably omitted, and the quality of the produced battery cannot be reliably guaranteed, namely, the electrical property of the battery is unstable. For example, in the detection of cracks in a battery, most of the existing manufacturers use a visual inspection method to inspect the battery to see whether the surface appearance of the battery has defects, and if the leakage of the battery is not obvious, it is very difficult to detect the leakage of the battery by visual inspection. In addition, some manufacturers may only detect the appearance of the battery in order to save cost, and it is known that, due to the active chemical properties of the battery, a certain voltage drop phenomenon occurs after the battery is produced, that is, the battery voltage during production does not meet a rated standard, and at this time, if only the battery is subjected to an appearance test, the internal defects of the battery cannot be detected by naked eyes, that is, the electrical performance of the battery cannot be reliably guaranteed.
Therefore, for the above reasons, the present application discloses a battery screening method, which can quickly identify defective batteries, ensure stable electrical performance of the batteries after the batteries are discharged, prevent a large voltage phenomenon, and prolong the service life of the batteries.
Referring to fig. 1, a battery screening method includes:
and step S01, performing appearance detection, voltage detection and internal resistance detection on the battery in sequence, and removing the battery with unqualified appearance detection, unqualified voltage detection or unqualified internal resistance detection to obtain the battery qualified by primary screening.
Therefore, it should be noted that, the appearance detection, the voltage detection and the internal resistance detection are sequentially performed on the battery, the battery which cannot pass the appearance detection, the battery which cannot pass the voltage test, or the battery which cannot pass the internal resistance detection are selected, and the unqualified batteries are removed to obtain the battery which is qualified by primary screening. The step is the first screening of the battery.
And step S02, discharging the batteries qualified for the first screening at a preset constant current for a preset discharge time, and placing the batteries qualified for the first screening after the first discharging at a preset temperature for high-temperature aging for a preset time to obtain the batteries qualified for the first high-temperature aging.
So, it should be noted that, carry out the operation of discharging to once screening qualified battery, the purpose of the operation of discharging is in order to let the voltage of battery inside more stable, let battery voltage and the internal resistance uniformity of battery obtain improving, still make battery storage performance obtain improving simultaneously, guarantee subsequent detection precision, prevent the false detection phenomenon, then, carry out high temperature ageing treatment to once screening qualified battery after discharging, the purpose of high temperature ageing treatment is that the battery that has little short circuit under the high temperature condition is from discharging can be faster, namely the voltage drop of battery is more obvious, high temperature ageing can let the testing personnel select the battery that has the problem more quickly, can also select the battery that has the weeping for follow-up quick simultaneously, improve detection efficiency.
And S03, standing the primary high-temperature aged battery for a preset standing time at normal temperature, and executing the step S01 again on the primary high-temperature aged battery to obtain a secondary screened qualified battery.
Thus, it should be noted that, after step S03 is executed, after the battery is left standing for a preset standing time at normal temperature, step S01 is executed again on the battery, that is, the battery is subjected to appearance detection, voltage detection and internal resistance detection again, since the electrical property of the battery may slightly change after the battery is subjected to discharge and high-temperature aging treatment, the battery is subjected to screening operation again, the battery that is unqualified after the battery is subjected to discharge and high-temperature aging treatment once can be removed, the battery that is qualified after secondary screening is left, and the screening is performed for the second screening this time.
And step S04, carrying out secondary discharge on the batteries qualified for secondary screening at a preset constant current for a preset discharge time, and placing the batteries qualified for secondary screening after secondary discharge at a preset temperature for high-temperature aging for a preset time to obtain secondary high-temperature aged batteries.
Therefore, it should be noted that, after the secondary screening is performed on the battery, the secondary screening is performed on the qualified battery again, and in the secondary discharge and secondary high-temperature aging process, the purpose of the secondary discharge in the step is the same as that of the primary discharge in the step S02, and all the purposes are to make the voltage inside the battery more stable, improve the consistency between the voltage of the battery and the internal resistance of the battery, improve the storage performance of the battery, ensure the subsequent detection precision, and prevent the occurrence of false detection; the purpose of the secondary high-temperature aging treatment in the step is the same as that of the secondary high-temperature aging treatment in the step S02, and the self-discharge of the battery with the internal micro short circuit under the high-temperature condition is faster, namely, the voltage drop of the battery is obvious, the high-temperature aging can enable a detector to quickly select the battery with problems, and meanwhile, the battery with leakage can be quickly selected for follow-up, so that the detection efficiency is improved.
And S05, standing the secondary high-temperature aged battery again at normal temperature for a preset standing time, and executing the step S01 on the secondary high-temperature aged battery again to obtain a battery qualified by three-time screening.
Thus, it should be noted that, after step S04 is executed, after the battery is placed still at normal temperature for a preset standing time, step S01 is executed again on the battery, that is, the battery is subjected to appearance detection, voltage detection and internal resistance detection again, since the electrical property of the battery is slightly changed after the battery is subjected to secondary discharge and secondary high-temperature aging treatment, the battery is subjected to screening operation again, the battery that is unqualified after the secondary discharge and secondary high-temperature aging treatment can be removed, the battery that is qualified after three times of screening is left, and this time of screening is the third time of screening.
It should be further noted that, in the present application, the processes of discharging the battery twice, aging the battery twice at high temperature and screening the battery three times are involved, and the stability of the electrical performance of the battery after the last detection step is stronger, by adopting the battery screening method of the present application, because the battery is subjected to the high-temperature aging treatment twice, when the battery after the aging treatment twice at high temperature is still a qualified product, the electrical performance of the battery is more stable, that is, the voltage inside the battery and the resistance inside the battery do not have a very obvious decline trend due to the increase of the user service time, and the quality of the battery after the production can be reliably ensured; in addition, this application can also discern the defective products battery fast, can improve detection efficiency greatly, lets the measurement personnel can spill over the defective products battery in the yields battery fast, can improve manufacturer's battery output rate to a certain extent.
Further, in one embodiment, in step S01, the appearance of the battery is detected specifically as follows:
whether the battery has the phenomena of recess, crack and liquid leakage or not is visually detected, and if the battery meets at least one of the phenomena, the battery is judged to be the battery with unqualified appearance detection; otherwise, the battery is judged to be qualified through appearance detection.
In this way, in appearance detection of the battery, the appearance problem of the battery is that the battery has a concave phenomenon, the surface of the battery has a crack phenomenon, and the battery has a liquid leakage phenomenon, and the concave phenomenon is specifically: the surface of the battery is deformed, for example, the shell of the battery is sunken towards the inside, and because the volume of the battery is small, if the battery is sunken, the space area inside the battery is greatly reduced, and related parts inside the battery can be contacted together due to extrusion, so that the short circuit phenomenon of the battery occurs; the specific surface of the battery with the crack phenomenon is as follows: the surface of the battery is cracked, if the cracks are too large, internal elements of the battery can be directly exposed, external foreign matters can possibly enter the interior of the battery to react with the battery, and great potential safety hazards exist; the leakage phenomenon of the battery is characterized in that: the electrolyte inside the battery permeates to the outside, and since the electrolyte is chemical liquid, if a user uses the battery, the electrolyte inside the battery permeates, and an explosion phenomenon is likely to occur. Therefore, for at least one of the above phenomena of the battery, it is necessary to determine that the current battery is a battery with unqualified appearance detection, and if and only if the battery has no three phenomena, the appearance detection of the battery can be determined to be qualified, and the current battery is determined to be a battery with qualified appearance detection.
In order to improve the accuracy of appearance detection, an inspector can use a tool such as a magnifying glass with a local external magnifying function to perform appearance detection on the battery, and some misjudgment or misjudgment may exist by simple visual detection.
Further, in one embodiment, in step S01, the voltage detection of the battery is specifically as follows:
detecting the potential difference between the anode and the cathode of the battery by using a voltage detector to obtain the current battery voltage, and if the current battery voltage is lower than a preset lower limit voltage or the current battery voltage is higher than a preset upper limit voltage, judging that the battery is unqualified in voltage detection; otherwise, the battery is judged to be qualified in voltage detection.
Therefore, it should be noted that, when voltage detection is performed on a battery, the voltage detection instrument is used, the voltage detection instrument is similar to a working principle of a voltmeter, two probes are arranged on the voltage detection instrument, one probe is used for contacting an anode of the battery, the other probe is used for detecting a cathode of the battery, when the probes are correspondingly contacted with the anode and the cathode of the battery, the voltage of the current battery is displayed on the voltage detection instrument, if the voltage of the current battery is lower than a preset lower limit voltage, the current battery is a low-voltage battery, if the voltage of the current battery is higher than a preset upper limit voltage, the current battery is a high-voltage battery, and whether the current battery is a low-voltage battery or a high-voltage battery, the battery is judged to be unqualified in voltage detection, and the low-voltage battery or the high-voltage battery needs to be removed, so that the produced battery reaches a rated voltage standard value.
It should be further noted that, in order to enable the voltage detector to more accurately detect the voltage of the battery, before the voltage detector formally detects the voltage of the battery, the short-circuit zero clearing operation needs to be performed on the voltage detector, and specifically, the short-circuit zero clearing operation is completed by mutually touching and contacting two probes of the voltage detector. If the short circuit zero clearing operation is not performed on the voltage detector, because the probe has certain internal resistance, a certain voltage drop is generated when current flows through the probe, and the voltage detected by the voltage detector is not the current voltage of the battery, therefore, the purpose of performing the short circuit zero clearing operation is to ensure that the voltage detector can accurately detect the voltage of the battery, prevent the battery from being misjudged, and greatly improve the detection accuracy through the short circuit zero clearing operation.
Further, in an embodiment, the preset lower limit voltage specifically includes a primary screening lower limit voltage, a secondary screening lower limit voltage and a tertiary screening lower limit voltage, the primary screening lower limit voltage is 3V to 3.3V, the secondary screening lower limit voltage is 3.05V to 3.25V, and the tertiary screening lower limit voltage is 3.05V to 3.25V; the preset upper limit voltage comprises a primary screening upper limit voltage, a secondary screening upper limit voltage and a tertiary screening upper limit voltage, wherein the primary screening upper limit voltage is 3.6V-3.8V, the secondary screening upper limit voltage is 3.4V-3.6V, and the tertiary screening upper limit voltage is 3.35V-3.45V;
in the primary screening, step S01 adopts a primary screening lower limit voltage and a primary screening upper limit voltage to perform voltage detection on the battery;
in the secondary screening, step S01 performs voltage detection on the battery using the secondary screening lower limit voltage and the secondary screening upper limit voltage;
in the third screening, step S01 performs voltage detection on the battery using the third screening lower limit voltage and the third screening upper limit voltage.
As described above, in the present application, since the battery is subjected to the discharge treatment twice and the high-temperature aging treatment twice, it is inevitable that a certain voltage drop occurs in the voltage inside the battery, and if a reference value for one-time screening is used in the subsequent secondary screening and the tertiary screening, erroneous determination is very likely to occur, and therefore, the reference values used in the secondary screening and the tertiary screening are different.
In the first screening, the adopted reference values for the voltage test of the battery are a primary screening lower limit voltage and a primary screening upper limit voltage, namely if the current battery voltage is lower than the primary screening lower limit voltage or the current battery voltage is higher than the primary screening upper limit voltage, the battery is judged to be the battery with unqualified voltage detection; otherwise, judging that the battery is qualified in voltage detection;
in the second screening, the adopted reference values for the voltage test of the battery are the secondary screening lower limit voltage and the secondary screening upper limit voltage, namely if the current battery voltage is lower than the secondary screening lower limit voltage or the current battery voltage is higher than the secondary screening upper limit voltage, the battery is judged to be the battery with unqualified voltage detection; otherwise, judging that the battery is qualified in voltage detection;
in the third screening, the adopted reference values for the voltage test of the battery are the third screening lower limit voltage and the third screening upper limit voltage, namely if the current battery voltage is lower than the third screening lower limit voltage or the current battery voltage is higher than the third screening upper limit voltage, the battery is judged to be the battery with unqualified voltage detection; otherwise, the battery is judged to be qualified in voltage detection.
It should be noted that, the specific values of the primary screening lower limit voltage, the secondary screening lower limit voltage, the tertiary screening lower limit voltage, the primary screening upper limit voltage, the secondary screening upper limit voltage and the tertiary screening upper limit voltage can be flexibly set according to actual conditions, and when the types of the batteries change, the specific values of the primary screening lower limit voltage, the secondary screening lower limit voltage, the tertiary screening lower limit voltage, the primary screening upper limit voltage, the secondary screening upper limit voltage and the tertiary screening upper limit voltage are correspondingly adjusted, so as to adapt to different types of batteries.
Further, in one embodiment, in step S01, the internal resistance detection of the battery is specifically as follows:
detecting the internal resistance of the battery by using a voltage detector to obtain the internal resistance value of the battery, and if the internal resistance value of the battery does not fall into a preset internal resistance interval, judging that the battery is unqualified in internal resistance detection; otherwise, the battery is judged to be qualified through internal resistance detection.
Therefore, it should be noted that, for the internal resistance detection of the battery, a voltage detector is also utilized, when two probes of the voltage detector correspondingly contact the positive electrode and the negative electrode of the battery, the voltage detector can display the current internal resistance value of the battery, and if the internal resistance value of the battery does not fall within a preset internal resistance range, the battery is determined to be a battery with unqualified internal resistance detection; otherwise, the battery is judged to be qualified through internal resistance detection.
It should be further noted that, before the internal resistance detection is performed, the short-circuit zero clearing operation may also be performed on the voltage detector, so that the voltage detector can more accurately detect the internal resistance of the battery.
Further, in an embodiment, the preset internal resistance interval includes a primary screening internal resistance interval, a secondary screening internal resistance interval, and a tertiary screening internal resistance interval, the primary screening internal resistance interval is [100m Ω, 650m Ω ], the secondary screening internal resistance interval is [100m Ω, 1000m Ω ], and the tertiary screening internal resistance interval is [100m Ω, 650m Ω ];
in the primary screening, step S01 adopts the primary screening internal resistance interval to perform internal resistance detection on the battery;
in the secondary screening, step S01 adopts the secondary screening internal resistance interval to detect the internal resistance of the battery;
in the third screening, step S01 detects the internal resistance of the battery by using the internal resistance interval of the third screening.
In this way, it should be noted that, since the present application involves two times of discharging and two times of high-temperature aging treatment of the battery, inevitably, the internal resistance of the battery will change to some extent, and if the reference value used for one time of screening is also used in the subsequent secondary screening and the third screening, erroneous determination will very easily occur, and therefore, the reference values used in the secondary screening and the third screening are different, and the above-mentioned principle is similar to the principle on which the voltage detection is based, and will not be repeated.
Further, in one embodiment, the preset discharge time is 20s to 360s, and the preset constant current is 400mA to 1200 mA.
Therefore, it should be noted that the preset discharge time and the preset constant current can be flexibly set according to actual conditions, and corresponding adjustment changes can be made.
Further, in one embodiment, the preset time is 1h to 100h, and the preset temperature is 50 ℃ to 80 ℃.
Therefore, it should be noted that the preset time and the preset temperature can be flexibly set according to the actual situation, and the corresponding adjustment changes are made.
Further, in an embodiment, the preset standing time is 4-10 h.
Therefore, it should be noted that the preset standing time can be flexibly set according to the actual situation, and the corresponding adjustment changes can be made.
It should be further noted that the preset lower limit voltage, the preset upper limit voltage, the preset discharging time, the preset constant current, the preset time, the preset temperature and the preset standing time can be correspondingly adjusted and changed according to actual detection conditions and types of batteries, and the above disclosed numerical values are applicable to batteries with the battery model CR123A, but the screening principle of the battery screening method of the present application does not change, that is, the battery screening method of the present application utilizes the processes of discharging the batteries twice, aging at high temperature twice and screening three times to maximally sort out the defective products in the batteries after production, so as to ensure that the electrical performance of the batteries does not have an obvious decline trend along with the increase of the service time, that is, the battery screening method of the present application has good consistency and long service life.
As shown in fig. 2, the voltage trends of the batteries with different screening methods within 100 days of high temperature are shown in fig. 2, and it can be seen from fig. 2 that the voltage of the battery with the screening method of the present application does not have a significant downward trend after the voltage of the battery is over 100 days, and the voltage stability is strong.
Similarly, fig. 3 shows the internal resistance trend of the battery with different screening modes within 100 days of high temperature, and it can be clearly seen from fig. 3 that the internal resistance of the battery subjected to the screening method of the present application does not have a significant rising trend after the internal resistance of the battery passes through 100 days, and the internal resistance is stable and strong.
According to the battery screening method, through carrying out appearance detection, voltage detection and internal resistance detection on the battery in sequence, the battery with unqualified appearance, unqualified voltage and unqualified internal resistance can be removed to obtain the battery qualified by primary screening, then, carrying out primary discharging operation, primary high-temperature aging and standing operation, carrying out appearance detection, voltage detection and internal resistance detection again to obtain the battery qualified by secondary screening, carrying out secondary discharging, secondary high-temperature aging and standing operation on the battery qualified by secondary screening, and finally, carrying out appearance detection, voltage detection and internal resistance detection again in sequence to obtain the battery qualified by tertiary screening. This application is through twice discharge, twice high temperature ageing and cubic screening, can discern the defective products battery fast, guarantees that the electrical property of postpartum battery can not be along with the increase of live time and change too badly, through twice discharge, twice high temperature ageing and cubic screening the battery that obtains, its life can obtain reliable assurance.
The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery screening method, comprising:
step S01, performing appearance detection, voltage detection and internal resistance detection on the battery in sequence, and removing the battery with unqualified appearance detection, unqualified voltage detection or unqualified internal resistance detection to obtain the battery qualified by primary screening;
step S02, discharging the qualified batteries after primary screening for one time at a preset constant current for a preset discharging time, and placing the qualified batteries after primary screening for one time after discharging at a preset temperature for high-temperature aging for a preset time to obtain the qualified batteries after primary high-temperature aging;
step S03, standing the battery subjected to primary high-temperature aging for a preset standing time at normal temperature, and executing the step S01 again on the battery subjected to primary high-temperature aging to obtain the battery qualified by secondary screening;
step S04, carrying out secondary discharge on the qualified secondary screening batteries at a preset constant current for a preset discharge time, and placing the qualified secondary screening batteries after secondary discharge at a preset temperature for high-temperature aging for a preset time to obtain the secondary high-temperature aged batteries;
and S05, standing the secondary high-temperature aged battery again at normal temperature for a preset standing time, and executing the step S01 again on the secondary high-temperature aged battery to obtain the qualified battery after three times of screening.
2. The battery screening method according to claim 1, wherein in the step S01, the appearance inspection of the battery is specifically:
whether the battery has the phenomena of recess, crack and liquid leakage or not is visually checked, and if the battery meets at least one of the phenomena, the battery is judged to be the battery with unqualified appearance detection; otherwise, the battery is judged to be qualified through appearance detection.
3. The battery screening method according to claim 1, wherein in the step S01, the voltage detection on the battery is specifically:
detecting the potential difference between the anode and the cathode of the battery by using a voltage detector to obtain the current battery voltage, and if the current battery voltage is lower than a preset lower limit voltage or higher than a preset upper limit voltage, determining that the battery is the battery with unqualified voltage detection; otherwise, the battery is judged to be qualified through voltage detection.
4. The battery screening method according to claim 3, wherein the preset lower limit voltage specifically includes a primary screening lower limit voltage, a secondary screening lower limit voltage, and a tertiary screening lower limit voltage, the primary screening lower limit voltage is 3V to 3.3V, the secondary screening lower limit voltage is 3.05V to 3.25V, and the tertiary screening lower limit voltage is 3.05V to 3.25V; the preset upper limit voltage comprises a primary screening upper limit voltage, a secondary screening upper limit voltage and a tertiary screening upper limit voltage, wherein the primary screening upper limit voltage is 3.6V-3.8V, the secondary screening upper limit voltage is 3.4V-3.6V, and the tertiary screening upper limit voltage is 3.35V-3.45V;
in the primary screening, the step S01 detects the voltage of the battery by using the primary screening lower limit voltage and the primary screening upper limit voltage;
in the secondary screening, the step S01 performs voltage detection on the battery using the secondary screening lower limit voltage and the secondary screening upper limit voltage;
in the third screening, the step S01 performs voltage detection on the battery by using the third screening lower limit voltage and the third screening upper limit voltage.
5. The battery screening method according to claim 3, further comprising a short circuit clearing operation on the voltage detector before the voltage detection is performed on the battery, wherein the short circuit clearing operation specifically includes:
and mutually colliding and contacting probes of the voltage detector, and performing short circuit zero clearing operation.
6. The battery screening method according to claim 1, wherein in the step S01, the internal resistance detection of the battery is specifically:
detecting the internal resistance of the battery by using a voltage detector to obtain the internal resistance value of the battery, and if the internal resistance value of the battery does not fall into a preset internal resistance interval, judging that the battery is the battery with unqualified internal resistance detection; otherwise, the battery is judged to be qualified through internal resistance detection.
7. The battery screening method according to claim 6, wherein the preset internal resistance intervals include a primary screening internal resistance interval, a secondary screening internal resistance interval and a tertiary screening internal resistance interval, the primary screening internal resistance interval is [100m Ω, 650m Ω ], the secondary screening internal resistance interval is [100m Ω, 1000m Ω ], and the tertiary screening internal resistance interval is [100m Ω, 650m Ω ];
in the primary screening, the step S01 detects the internal resistance of the battery by using the primary screening internal resistance interval;
in the secondary screening, the step S01 performs internal resistance detection on the battery by using the secondary screening internal resistance interval;
in the third screening, the step S01 performs internal resistance detection on the battery by using the internal resistance interval of the third screening.
8. The battery screening method according to claim 1, wherein the preset discharge time period is 20s to 360s, and the preset constant current is 400mA to 1200 mA.
9. The battery screening method according to claim 1, wherein the preset time period is 1h to 100h, and the preset temperature is 50 ℃ to 80 ℃.
10. The battery screening method according to claim 1, wherein the preset standing time is 4 to 10 hours.
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| CN114308716B (en) * | 2021-12-31 | 2024-04-19 | 珠海冠宇电池股份有限公司 | Battery leakage detection method, device, computer equipment, system and storage medium |
| CN116859249B (en) * | 2023-05-31 | 2024-05-10 | 长兴太湖能谷科技有限公司 | Lithium battery monitoring management system based on big data |
| CN116739718B (en) * | 2023-08-11 | 2024-01-09 | 深圳市泰科动力系统有限公司 | New energy power battery performance detection recommendation system |
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