CN113624275A - Test detection method for multiple states in lithium battery cycle test - Google Patents
Test detection method for multiple states in lithium battery cycle test Download PDFInfo
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- CN113624275A CN113624275A CN202110819776.6A CN202110819776A CN113624275A CN 113624275 A CN113624275 A CN 113624275A CN 202110819776 A CN202110819776 A CN 202110819776A CN 113624275 A CN113624275 A CN 113624275A
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000001514 detection method Methods 0.000 title claims abstract description 49
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 12
- 230000008961 swelling Effects 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims 7
- 230000008569 process Effects 0.000 abstract description 14
- 238000004064 recycling Methods 0.000 abstract description 2
- 208000028659 discharge Diseases 0.000 description 10
- 238000007599 discharging Methods 0.000 description 7
- 238000013519 translation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a test detection method for multiple states in a lithium battery cycle test. The method can detect various state data of the lithium battery in the recycling process, so that the accuracy and reliability of the lithium battery data are improved, and the method is simple in structure and convenient to use. The method comprises the following steps: s1: assembling a test device; s2: carrying out data measurement work on a battery sample before cyclic charge and discharge test; s3: the data measurement work after the battery test sample 5 is subjected to the cyclic charge and discharge test; s4: calculating the thickness increased by swelling of the battery according to (d3-d1) + (d4-d 2); s5: the two detection platforms 3 are respectively provided with a thermal imager 32, and the two detection platforms 3 monitor the temperature of the whole surface of the corresponding battery through the respective thermal imagers 32; s6: the use state of the battery sample is judged by detecting the D value and the T value.
Description
Technical Field
The invention relates to the technical field of lithium battery tests, in particular to a test detection method for multiple states in a lithium battery cycle test.
Background
At present, under different charging and discharging tests, particularly during the test of the cycle life, except that a charging and discharging machine can record current and voltage and the temperature of a single position, other more data cannot be monitored.
In the prior art, in the lithium battery test, besides data results, changes of many process parameters are necessarily monitored, and more test state data have great significance for the test research of the lithium battery than the recording of current and voltage changes. For example, in a cycle test of a lithium battery, the connection reliability between the battery and the device gradually deteriorates with the increase of the number of cycles, thereby affecting the cycle performance of the battery and deviating from the original result. In addition, it is also necessary to record the thickness of the lithium battery in the cycle test, the cycle is basically suspended when the thickness of the current cycle battery is measured, the battery is taken down from the loop for measurement, the cycle test depends on manual work, the efficiency is low, because the manual work has more defects by taking the vernier caliper for measurement, firstly, the position for measuring for many times in the cycle process can be inaccurate, secondly, the size of the general vernier caliper is limited, in addition, the battery bulge is thin at two sides of the middle drum, the thickness of the center position of the battery can not be measured, and the error of the manual measurement of the bulge thickness of the battery is larger unless a very large vernier caliper is taken. In addition, the temperature collecting line of the existing charging and discharging machine can only record the temperature change of a single position, and the temperature difference and the change condition of different positions on the whole surface of the battery cannot be monitored. The loss of the state records in the lithium battery test cannot judge whether the connection state of the sample is normal or not, and the sample state research corresponding to test data such as circulation and the like is lack of depth.
Disclosure of Invention
The invention aims to solve the defects of the existing lithium battery test, and provides the test detection method for multiple states in the lithium battery cycle test, which can detect the data of multiple states of the lithium battery in the cycle use process, further improves the accuracy and reliability of the data of the lithium battery, has a simple structure, and is convenient to use.
The technical problem is solved by the following technical scheme:
a test detection method for multiple states in a lithium battery cycle test comprises the following steps:
the method comprises the following steps:
s1: assembling a test device;
the testing device comprises a base, two clamping pieces, two detection platforms and a wire guide rod, wherein the two detection platforms are respectively installed at the left end and the right end of the base in a sliding mode;
s2: carrying out data measurement work on a battery sample before cyclic charge and discharge test;
the two detection platforms are respectively provided with a laser range finder, the distances between the two detection platforms and the corresponding clamping piece measured by the respective laser range finder are d1 and d2 respectively, and measurement data are recorded;
s3: carrying out data measurement work after the battery test sample is subjected to cyclic charge and discharge test;
the two detection platforms measure the distances from the corresponding clamping pieces as d3 and d4 respectively, and record measurement data;
s4: calculating the thickness increased by the swelling of the battery according to (D3-D1) + (D4-D2) and recording as D;
s5: the two detection platforms are respectively provided with a thermal imager, and the two detection platforms monitor the temperature of the whole surface of the corresponding battery through the respective thermal imagers and are marked as T;
s6: the use state of the battery sample is judged by detecting the D value and the T value.
As a further scheme of the invention: the cyclic charge and discharge test of the battery sample is realized by connecting the positive and negative circuits of the charge and discharge equipment fixed on the wire guide rod.
As a further scheme of the invention: two parallel and symmetrical slide rails are respectively arranged at the front end and the rear end of the base.
As a further scheme of the invention: the two clamping pieces of the experimental device are symmetrically arranged and are both connected to the two sliding rails of the base in a sliding manner; the battery sample is clamped and placed between the two clamping pieces.
As a further scheme of the invention: two of the experimental device the testing platforms are respectively installed on the base in a sliding mode, and the two clamping pieces are located between the two testing platforms.
As a further scheme of the invention: the wire guide rod of the experimental device is fixedly arranged on the base and has no spatial interference with the clamping piece and the detection platform.
As a further scheme of the invention: the detection platform is a liftable platform.
As a further scheme of the invention: the detection platform is movable on the base.
The invention can achieve the following effects:
the invention provides a test detection method for various states in a lithium battery cycle test, and compared with the prior art, the invention has the beneficial effects that: the lithium battery data detection device can detect various state data of the lithium battery in the recycling process, so that the accuracy and the reliability of the lithium battery data are improved, and the lithium battery data detection device is simple in structure and convenient to use.
Drawings
FIG. 1 is a schematic view of the overall structure of the test apparatus according to the embodiment of the present invention.
The figures are numbered: the device comprises a base 1, a sliding rail 10, a clamping piece 2, a detection platform 3, a wire guide rod 4, a battery sample 5, a laser range finder 31 and a thermal imager 32.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment, a method for testing and detecting multiple states in a lithium battery cycling test is shown in fig. 1, and the method comprises the following steps:
s1: assembling a test device;
the testing device comprises a base 1, two clamping pieces 2, two detection platforms 3 and a wire guide rod 4, wherein the two detection platforms 3 are respectively installed at the left end and the right end of the base 1 in a sliding mode, the two clamping pieces 2 are installed on the base 1 between the two detection platforms 3 in a sliding mode, the wire guide rod 4 is installed on the base 1, and wires for detecting a battery sample 5 are arranged on the wire guide rod 4 and clamp the battery sample 5 between the two clamping pieces 2;
s2: carrying out data measurement work on a battery sample before cyclic charge and discharge test;
the two detection platforms 3 are respectively provided with a laser range finder 31, the two detection platforms 3 respectively measure the distances d1 and d2 from the corresponding clamping piece 2 through the respective laser range finders 31, and record the measurement data;
s3: the data measurement work after the battery test sample 5 is subjected to the cyclic charge and discharge test;
the two detection platforms 3 measure the distances d3 and d4 from the corresponding clamping pieces 2 respectively, and record the measurement data;
s4: calculating the thickness increased by the swelling of the battery according to (D3-D1) + (D4-D2) and recording as D;
s5: the two detection platforms 3 are respectively provided with a thermal imager 32, and the two detection platforms 3 monitor the temperature of the whole surface of the corresponding battery through the respective thermal imagers 32 and are marked as T;
s6: the use state of the battery sample is judged by detecting the D value and the T value. The recorded D value according to a certain period can enable the variation of the thickness of the lithium battery in the cyclic test process to correspond to the cycle number and the capacity retention rate, and the temperature record can obtain different temperature variations in the cyclic charge or discharge process and temperature rise changes of the battery under different SOH (SOH is the health state of the battery).
The cyclic charge and discharge test of the battery sample 5 is realized by connecting positive and negative circuits fixed on the wire guide rod 4. Be equipped with the electric wire ware of restrainting of promotion formula on wire guide bar 4 in this embodiment for support and fixed charging and discharging equipment's electric current line and voltage line, the pencil is prevented freely droing on the battery surface when the cycle test, avoids influencing the monitoring result of battery thickness or temperature.
In this embodiment, the front end and the rear end of the base 1 are respectively provided with two slide rails 10 which are arranged in parallel and symmetrically. The two clamping pieces 2 of the experimental device are symmetrically arranged and are both connected to the two slide rails 10 of the base 1 in a sliding manner; the battery sample 5 is clamped between two clamping members 2. The two clamping pieces 2 are located between the two detection platforms 3. The wire guide rod 4 of the experimental device is fixedly arranged on the base 1 and has no space interference with the clamping piece 2 and the detection platform 3. The detection platform 3 is a liftable platform; the detection platform 3 is movable on the base 1.
The movement of the detection platform 3 in this embodiment is a relative transverse translation, but other embodiments are not limited thereto, and the movement may be a magnetic attraction type translation, a relative sliding in an embedding manner, a direct translation, or the like; of course, intelligent/electronic control type translation and the like can also be adopted.
In the embodiment, the battery sample 5 is vertically arranged in the testing device, in order to ensure that the battery sample 5 always keeps a vertical state in the testing process, the clamping piece 2 can move to adjust the position, the clamping piece 2 supports the battery sample from two sides of the sample, and the battery sample 5 can be supported to keep vertical. The clamping pieces 2 on the two sides of the battery sample 5 move through slide rails arranged on the side faces so as to adapt to the arrangement of the battery samples 5 with different thicknesses. The battery sample 5 is swelled in the test, the clamping pieces 2 on two sides can be moved by the swelling force, and the clamping pieces 2 can only be moved on the sliding rails 10 by the expansion of the batteries on the plane of the base 1 by the sliding rails 10 of the clamping pieces 2.
The laser range finder 31 is arranged on the detection platform 3 and comprises a laser transmitter and a signal receiver, the distance between the test device and the battery sample 5 is detected by laser, and the detection platform 3 can move left and right and be adjusted up and down to test the bulging conditions of the battery sample 5 at different positions according to requirements; before the battery sample 5 is subjected to the cycle test, the battery sample 5 is fixed, an initial value is obtained through a laser range finder, the battery sample 5 bulges in the cycle process, the distance between the battery sample 5 and the devices on two sides at the moment is detected, and the sum of the difference between the two sides is the thickness variation of the battery sample 5.
Except that being equipped with laser range finder 31, still be equipped with infrared thermal imager 32, can obtain the temperature of battery surface different positions department, combine the charge-discharge situation, can obtain the heat production condition of lithium cell under the different processes, like the earlier stage and the later stage of charging process, the earlier stage and the later stage of discharge process to and the heat production change of lithium cell under different capacity decline, if find that the temperature of battery sample 5 positive pole or negative pole junction is unusually high in addition, also show here and connect the reliability and worsen, need retighten.
The detection platforms 3 at the two ends of the base can be adjusted in height and moved left and right. The movement or lifting of the detection platform 3 can be controlled by a connected computer, and coordinates can be accurately set so that the thicknesses of the front surface and the rear surface of the battery sample 5 at a certain position can be obtained by laser tests at two sides. The laser and the thermal imager can be controlled on a computer through software, and can also be shot and measured when the set cycle number is reached together with the program of the charging and discharging equipment on the computer, and the shooting and measurement are recorded.
In this embodiment, a wire guide rod 4 is further disposed on one side of the experimental apparatus, and two wires with metal clips are connected to the front end of the wire guide rod and can be respectively clipped on the positive electrode and the negative electrode of the battery and the current wire of the charging and discharging device, so that the wire guide rod can be used as a direct current resistance meter to record accurate connection resistance in real time, and the connection reliability between the positive electrode and the negative electrode of the battery and the connection wire of the charging and discharging device can be accurately judged through data. The value can also be read and recorded by software.
The experimental device in the embodiment is used for the deep research of the cycle performance of the lithium battery, and can correspond the expansion and thickening degree and time of the battery in the cycle to the cycle number and the capacity to obtain dynamic data of the battery in the whole cycle process.
In this embodiment, a real-time recording mode is adopted, but other embodiments are not limited to this, and recording may be performed by recording once every other time period or once every certain number of cycles.
The invention provides a test detection method for multiple states in a lithium battery cycle test, which can detect multiple state data of a lithium battery in a cycle use process, further improve the accuracy and reliability of the lithium battery data, and has the advantages of simple structure and convenience in use.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields and are included in the scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A test method for cycle test of a lithium battery is characterized by comprising the following steps:
s1: assembling a test device;
the testing device comprises a base, two clamping pieces, two detection platforms and a wire guide rod, wherein the two detection platforms are respectively installed at the left end and the right end of the base in a sliding mode;
s2: carrying out data measurement work on a battery sample before cyclic charge and discharge test;
the two detection platforms are respectively provided with a laser range finder, the distances between the two detection platforms and the corresponding clamping piece measured by the respective laser range finder are d1 and d2 respectively, and measurement data are recorded;
s3: carrying out data measurement work after the battery test sample is subjected to cyclic charge and discharge test;
the two detection platforms measure the distances from the corresponding clamping pieces as d3 and d4 respectively, and record measurement data;
s4: calculating the thickness increased by the swelling of the battery according to (D3-D1) + (D4-D2) and recording as D;
s5: the two detection platforms are respectively provided with a thermal imager, and the two detection platforms monitor the temperature of the whole surface of the corresponding battery through the respective thermal imagers and are marked as T;
s6: the use state of the battery sample is judged by detecting the D value and the T value.
2. The lithium battery cycle test method as claimed in claim 1, wherein the cycle charge and discharge test of the battery sample is performed by connecting positive and negative electrode lines of the charge and discharge device fixed on the wire guide rod.
3. The lithium battery cycle test method as recited in claim 1, wherein the front and rear ends of the base are respectively provided with two slide rails which are arranged in parallel and symmetrically.
4. The lithium battery cycle test method as recited in claim 3, wherein the two clamping members of the experimental device are symmetrically arranged and are both slidably connected to the two slide rails of the base; the battery sample is clamped and placed between the two clamping pieces.
5. The lithium battery cycle test method as claimed in claim 3, wherein the two test platforms of the test device are respectively slidably mounted on the base, and the two clamping members are located between the two test platforms.
6. The lithium battery cycle test method as recited in claim 3, wherein the wire guide rod of the experimental device is fixedly mounted on the base without spatial interference between the wire guide rod and the clamping member and the detection platform.
7. The lithium battery cycle test method of claim 1, wherein the detection platform is a liftable platform.
8. The method as claimed in claim 1, wherein the testing platform is movable on a base.
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| CN202110819776.6A CN113624275B (en) | 2021-07-20 | 2021-07-20 | Test detection method for multiple states in lithium battery cycle test |
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Cited By (1)
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