CN109917300B - Measuring method for improving voltage internal resistance of single winding core in lithium battery - Google Patents
Measuring method for improving voltage internal resistance of single winding core in lithium battery Download PDFInfo
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- CN109917300B CN109917300B CN201910067641.1A CN201910067641A CN109917300B CN 109917300 B CN109917300 B CN 109917300B CN 201910067641 A CN201910067641 A CN 201910067641A CN 109917300 B CN109917300 B CN 109917300B
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Abstract
The invention discloses a measuring method for improving voltage internal resistance of a single winding core in a lithium battery, which comprises the following steps: disassembling the square lithium battery, removing the shell, and separating the pole and the winding core to obtain the winding core welded together; separating welding spot areas according to the number of the single winding cores; separating all the polar lug areas except the welding spot area according to the number of the single winding cores, so that each winding core is separated, and each winding core is reserved with a part of the welding spot area; and measuring the voltage internal resistance value of each winding core welding spot area by using an internal resistance meter. The invention can avoid the difference and fluctuation of voltage internal resistance measurement caused by different measurement positions and forces of the multi-tab winding core, and improve the measurement accuracy. The measuring method can provide reference for the disassembly analysis of the multi-roll-core square lithium battery, and improves the judgment effectiveness of the abnormal roll core.
Description
Technical Field
The invention relates to the technical field of measuring methods for voltage and internal resistance of a single winding core in a lithium battery, in particular to a measuring method for improving the voltage and internal resistance of the single winding core in the lithium battery.
Background
Electric vehicles have the advantages of no pollution, low noise, high energy efficiency, simple structure and the like, and have become an important development direction in the automobile industry. The lithium battery is one of cores, the structural design of the lithium battery is various, the number of the winding cores of the square lithium battery is 1-3, and the state of each winding core influences the performance of the whole battery.
For the performance verification of a multi-roll core square lithium battery and the disassembly and analysis of a market operation fault battery, it is very important to accurately measure the voltage internal resistance of each roll core, and if an improper measurement mode is adopted, the more the tabs are, the greater the influence of the measurement of different positions and forces on the measurement stability and accuracy of the voltage internal resistance is, so that the method for measuring the voltage internal resistance of a single roll core in the lithium battery is very necessary to be improved.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for improving the voltage and internal resistance of a single winding core in a lithium battery, which can avoid the difference and fluctuation of voltage and internal resistance measurement caused by different measurement positions and forces of a multi-tab winding core and improve the measurement accuracy. The measuring method can provide reference for the disassembly analysis of the multi-roll-core square lithium battery, and improves the judgment effectiveness of the abnormal roll core.
The invention provides a measuring method for improving voltage internal resistance of a single winding core in a lithium battery, which comprises the following steps:
s1, disassembling the square lithium battery, removing the shell, and separating the pole from the winding core to obtain the winding core welded together;
s2, separating welding spot areas according to the number of the single winding cores;
s3, separating all the polar lug areas except the welding point area according to the number of the single winding cores, and realizing separation of the winding cores and reserving a part of welding point area for each winding core;
and S4, measuring the voltage internal resistance value of the welding point area of each winding core by using an internal resistance meter.
Preferably, in S1, the square lithium battery includes 2-3 winding cores with multiple tabs, and the winding cores are pre-welded and then post-welded to connect the winding cores with the cover plate.
Preferably, in S1, the welding point area (a) of the welded-together cores remains intact.
Preferably, in S2, the number of single-winding cores is 2-3, and the average sheared welding spot area is 2-3 small welding spot areas (A1/A2, or A1/A2/A3).
Preferably, in S3, each separated core has a small area of weld (a1/a2, or a1/a2/A3) and the other tab areas remain intact.
Preferably, in S4, the position of each core roll weld region is measured as a small weld region (A1/A2, or A1/A2/A3) by the internal resistance meter.
The measuring method of the invention falls into the welding spot area, can accurately measure the voltage internal resistance value of each winding core, can avoid the difference and fluctuation of voltage internal resistance measurement caused by different measuring positions and forces of the multi-tab winding core, and improves the measuring accuracy. The measuring method can provide reference for the disassembly analysis of the multi-roll-core square lithium battery, and improves the judgment effectiveness of the abnormal roll core.
Drawings
FIG. 1 is a flowchart of a method of example 2 of the present invention;
FIG. 2 is a schematic view of a measurement method in example 2 of the present invention;
FIG. 3 is a schematic diagram of a measurement method in embodiment 3 of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A measuring method for improving voltage internal resistance of a single winding core in a lithium battery comprises the following steps:
s1, disassembling the square lithium battery, removing the shell, and separating the pole from the winding core to obtain the winding core welded together;
s2, separating welding spot areas according to the number of the single winding cores;
s3, separating all the polar lug areas except the welding point area according to the number of the single winding cores, and realizing separation of the winding cores and reserving a part of welding point area for each winding core;
and S4, measuring the voltage internal resistance value of the welding point area of each winding core by using an internal resistance meter.
Example 2
Referring to fig. 1 and 2, a measurement method for improving voltage internal resistance of a single winding core in a lithium battery comprises the following steps:
s1, disassembling the square lithium battery with 2 multi-pole-tab winding cores, wherein the production process comprises the steps of pre-welding 2 winding cores and then carrying out pole welding to connect the winding cores with the cover plate. Removing the shell, and separating the pole from the winding core by using scissors to obtain the winding core welded together;
s2, cutting the welding spot area into 2 parts by using scissors, wherein the parts are A1 and A2, and A1 is A2;
s3, separating all polar lug areas except the welding point area by using scissors to realize the separation of 2 winding cores, wherein the welding point areas of the 2 winding cores are A1 and A2 respectively;
s4, measuring the voltage V1 and the internal resistance R1 of the welding point area A1 of the winding core 1 by using an internal resistance meter, and measuring the voltage V2 and the internal resistance R2 of the welding point area A2 of the winding core 2 by using the internal resistance meter.
Example 3
Referring to fig. 3, a measurement method for improving voltage internal resistance of a single winding core in a lithium battery comprises the following steps:
s1, disassembling the square lithium battery with 3 multi-pole-tab winding cores, wherein the production process comprises the steps of pre-welding 3 winding cores and then carrying out pole welding to connect the winding cores with the cover plate. Removing the shell, and separating the pole from the winding core by using scissors to obtain the winding core welded together;
s2, cutting the welding spot area into 3 parts by using scissors, wherein the parts are A1, A2 and A3, and A1 is A2 is A3;
s3, separating all polar lug areas except the welding point area by using scissors to realize the separation of 3 winding cores, wherein the welding point areas of the 3 winding cores are A1, A2 and A3 respectively;
s4, measuring the voltage V1 and the internal resistance R1 of the welding point area A1 of the winding core 1 by using an internal resistance meter, measuring the voltage V2 and the internal resistance R2 of the welding point area A2 of the winding core 2 by using the internal resistance meter, and measuring the voltage V3 and the internal resistance R3 of the welding point area A3 of the winding core 3 by using the internal resistance meter.
As can be seen from the combination of FIGS. 2-3, the measuring method of the present invention is located in the welding spot area, and the voltage internal resistance of each winding core can be accurately measured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A measuring method for improving voltage internal resistance of a single winding core in a lithium battery is characterized by comprising the following steps:
s1, disassembling the square lithium battery, removing the shell, and separating the pole from the winding core to obtain the winding core welded together;
s2, separating welding spot areas according to the number of the single winding cores;
s3, separating all the polar lug areas except the welding point area according to the number of the single winding cores, and realizing separation of the winding cores and reserving a part of welding point area for each winding core;
and S4, measuring the voltage internal resistance value of the welding point area of each winding core by using an internal resistance meter.
2. The method for improving the voltage and the internal resistance of the single winding core in the lithium battery as claimed in claim 1, wherein in S1, the square lithium battery comprises 2-3 winding cores with multiple tabs, and the winding cores are pre-welded and then post-welded to connect the winding cores with the cover plate.
3. The method for measuring the voltage and the internal resistance of the single winding core in the lithium battery as claimed in claim 1 or 2, wherein in S1, the welding point area of the winding cores welded together is kept intact.
4. The method for improving the internal resistance of the voltage of the single winding core inside the lithium battery as claimed in claim 1, wherein in S2, the number of the single winding cores is 2-3, and the average sheared welding spot area is 2-3 small welding spot areas.
5. The method for measuring the improvement of the internal resistance of the voltage of the single winding core in the lithium battery as claimed in claim 1, wherein in S3, the welding point area of each separated winding core is a small welding point area, and other tab areas are kept intact.
6. The method for improving the internal resistance of the voltage of the single winding core inside the lithium battery as claimed in claim 1, wherein in S4, the position of the welding point area of each winding core is measured as the small welding point area by the internal resistance meter.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006221834A (en) * | 2005-02-08 | 2006-08-24 | Matsushita Electric Ind Co Ltd | Method of manufacturing positive electrode for organic electrolytic solution battery and organic electrolytic solution battery |
| CN105990611A (en) * | 2015-01-27 | 2016-10-05 | 深圳市比克电池有限公司 | Lithium ion battery wound core and manufacturing method of same |
| CN107490724A (en) * | 2017-08-30 | 2017-12-19 | 福建猛狮新能源科技有限公司 | A kind of core insulation inner walkway device and its method of testing |
| CN108196155A (en) * | 2017-12-25 | 2018-06-22 | 桑德集团有限公司 | It is a kind of for detect battery roll core whether short circuit method |
| CN108646192A (en) * | 2018-05-11 | 2018-10-12 | 合肥国轩高科动力能源有限公司 | A method of structure lithium ion battery coil core circuit model |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008140628A (en) * | 2006-11-30 | 2008-06-19 | Sanyo Electric Co Ltd | Battery pack and its manufacturing method |
| US8586222B2 (en) * | 2010-04-08 | 2013-11-19 | GM Global Technology Operations LLC | Lithium-ion cell with an array of reference electrodes |
| CN105514480B (en) * | 2016-02-01 | 2019-01-15 | 陈佩 | The packaging method of column lithium ion battery and negative pole end |
| CN107086320B (en) * | 2017-04-13 | 2023-04-18 | 大连中比动力电池有限公司 | Lithium ion battery case, method for manufacturing same, and lithium ion battery |
-
2019
- 2019-01-24 CN CN201910067641.1A patent/CN109917300B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006221834A (en) * | 2005-02-08 | 2006-08-24 | Matsushita Electric Ind Co Ltd | Method of manufacturing positive electrode for organic electrolytic solution battery and organic electrolytic solution battery |
| CN105990611A (en) * | 2015-01-27 | 2016-10-05 | 深圳市比克电池有限公司 | Lithium ion battery wound core and manufacturing method of same |
| CN107490724A (en) * | 2017-08-30 | 2017-12-19 | 福建猛狮新能源科技有限公司 | A kind of core insulation inner walkway device and its method of testing |
| CN108196155A (en) * | 2017-12-25 | 2018-06-22 | 桑德集团有限公司 | It is a kind of for detect battery roll core whether short circuit method |
| CN108646192A (en) * | 2018-05-11 | 2018-10-12 | 合肥国轩高科动力能源有限公司 | A method of structure lithium ion battery coil core circuit model |
Non-Patent Citations (1)
| Title |
|---|
| 锂离子电池拆解过程;qindong28;《百度文库》;20121007;第1-5页 * |
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