CN109742306B - Method for improving prewelding quality of negative electrode tab of high-power lithium ion battery - Google Patents
Method for improving prewelding quality of negative electrode tab of high-power lithium ion battery Download PDFInfo
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- CN109742306B CN109742306B CN201811479417.5A CN201811479417A CN109742306B CN 109742306 B CN109742306 B CN 109742306B CN 201811479417 A CN201811479417 A CN 201811479417A CN 109742306 B CN109742306 B CN 109742306B
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Abstract
The invention discloses a method for improving the prewelding quality of a cathode tab of a high-power lithium ion battery, which comprises the following steps of: arranging a plurality of negative electrode copper lugs to enable one ends of the negative electrode copper lugs to be positioned on the same plane, performing primary pre-welding by adopting an ultrasonic welding machine, standing, and then performing secondary pre-welding. According to the method for improving the prewelding quality of the high-power lithium ion battery cathode lug, the energy value and the pressure under welding required during welding are reduced in a secondary welding mode, the generation of metal chips is reduced, the welding firmness is improved, the power performance of the battery is improved, the short circuit rate of the battery cell in the production process is reduced, technical support is provided for the improvement of the power consistency and the process improvement of the high-power lithium ion battery, the battery straight-through rate is improved, and the production cost of an enterprise is reduced.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for improving the prewelding quality of a cathode tab of a high-power lithium ion battery.
Background
The lithium ion power battery is used as an important component of the electric vehicle, and the performance of the lithium ion power battery directly influences the normal use of the electric vehicle. Due to popularization and application, the electrical property and the safety performance of the cable are widely concerned. At present, two main technical routes in China are high-power lithium ion batteries and pure power high-energy lithium ion power battery technologies, wherein the pure power high-energy lithium ion batteries are influenced by gram capacity of raw materials of the batteries, and the energy density is greatly improved with certain technical difficulty. For a high-power lithium ion battery, the power performance of the battery is mainly considered, a 12V vehicle-mounted start-stop power supply and a 48V light hybrid vehicle-mounted system are mostly applied in the current market, and the market demand is gradually increased. However, the improvement of the power density of the high-power lithium ion battery is not only related to the anode and cathode materials of the battery, the process parameters and the conductivity of the electrolyte, but also the design of the battery structural member is very important. At present, most battery manufacturers improve the flow area of the battery through the design mode of the full-lug structural members on two sides, so that the multiplying power and the power performance of the battery are improved.
The consistency of the power performance of the high-power battery is closely related to the welding mode and quality of the lug, the inconsistency of the welding quality seriously influences the performance of the power performance of the battery, and because the welding area of the high-power battery is increased, the pre-welding of the lug is more complicated compared with the welding of the energy type battery, more metal chips are generated in the process, the self-discharge of the power type battery is larger, and the short-circuit rate of the battery core is higher than that of the energy type battery.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for improving the prewelding quality of a cathode tab of a high-power lithium ion battery, which reduces the energy value and the welding pressure required during welding, reduces the generation of metal chips, improves the welding firmness, improves the power performance of the battery, reduces the short circuit rate of a battery cell in the production process, provides technical support for the improvement of the power consistency and the process improvement of the high-power lithium ion battery, improves the direct current rate of the battery, and reduces the production cost of enterprises in a secondary welding mode.
The invention provides a method for improving the prewelding quality of a cathode tab of a high-power lithium ion battery, which comprises the following steps of: arranging a plurality of negative electrode copper lugs to enable one ends of the negative electrode copper lugs to be positioned on the same plane, performing primary pre-welding by adopting an ultrasonic welding machine, standing, and then performing secondary pre-welding.
Preferably, the size of the negative electrode copper tab is 200mm × 8mm × 10 mm.
Preferably, the welding parameters of the first pre-welding and the second pre-welding are the same.
Preferably, the welding parameters are as follows: the welding energy is 350-450J, the welding pressure is 413.7-551.6kPa, and the welding time is 0.5-1.5 s.
Preferably, the standing time is 1-3 s.
According to the invention, through the experiment of welding firmness and cell short-circuit rate of each parameter of the prewelding of the cathode lug in the manufacturing process of the high-power lithium ion battery, a novel secondary welding method is developed for prewelding, the required energy value of ultrasonic welding equipment is reduced, the welding time is shortened, the welding quality is improved, the micro short circuit of the cell caused by metal chips generated in the welding process is reduced, the yield of the working procedures is improved, the production cost of the battery is reduced, technical support is provided for the welding of a high-power battery structural member, the consistency of the battery in the production process is ensured, the potential safety hazard in the running process of the whole vehicle is reduced, and the method has very important guiding significance for the actual production.
Drawings
Fig. 1 is a test chart of pulse discharge power performance of batteries manufactured by using the negative electrode tabs of the lithium ion batteries obtained in example 6 and comparative example 8.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Examples
A method for improving the prewelding quality of a high-power lithium ion battery cathode lug comprises the following steps: arranging 5 negative electrode copper lugs with the sizes of 200mm multiplied by 8mm multiplied by 10mm to enable one ends of the negative electrode copper lugs to be positioned on the same plane, performing primary pre-welding by adopting an ultrasonic welding machine, standing, and then performing secondary pre-welding; wherein the welding parameters of the primary prewelding and the secondary prewelding are the same.
The welding parameters for examples 1-7 are shown in table 1 below by adjusting the welding energy value, the down-weld pressure and the welding time during the welding process:
table 1 examples 1-7 welding parameters
| Welding energy value/J | Pressure under welding/kPa | Welding time/s | |
| Example 1 | 450 | 551.60 | 1.5 |
| Example 2 | 400 | 551.60 | 1.5 |
| Example 3 | 350 | 551.60 | 1.5 |
| Example 4 | 400 | 482.65 | 1.5 |
| Example 5 | 400 | 413.70 | 1.5 |
| Example 6 | 400 | 413.70 | 1 |
| Example 7 | 400 | 413.70 | 0.5 |
Comparative example
A prewelding method for a cathode tab of a high-power lithium ion battery comprises the following steps: arranging 5 negative electrode copper lugs with the sizes of 200mm multiplied by 8mm multiplied by 10mm to enable one ends of the negative electrode copper lugs to be positioned on the same plane, and performing one-time pre-welding by adopting an ultrasonic welding machine.
The welding parameters of comparative examples 1 to 10 are shown in the following table 2 by adjusting the welding energy value, the welding down pressure and the welding time during the welding process:
TABLE 2 comparative examples 1-10 welding parameters
| Welding energy value/J | Weld downforce/kPa | Welding time/s | |
| Comparative example 1 | 550 | 551.60 | 2.5 |
| Comparative example 2 | 550 | 620.55 | 2.5 |
| Comparative example 3 | 550 | 482.65 | 2.5 |
| Comparative example 4 | 600 | 551.60 | 2.5 |
| Comparative example 5 | 500 | 551.60 | 2.5 |
| Comparative example 6 | 450 | 551.60 | 2.5 |
| Comparative example 7 | 400 | 551.60 | 2.5 |
| Comparative example 8 | 450 | 551.60 | 2 |
| Comparative example 9 | 450 | 551.60 | 1.5 |
| Comparative example 10 | 450 | 551.60 | 1 |
The lithium ion battery negative electrode tabs obtained in examples 1 to 7 and the lithium ion battery negative electrode tabs obtained in comparative examples 1 to 10 were tested:
I. performing a weight tension test, and recording the firm qualified rate of welding if the tension is greater than 300N and the welding is firm;
II. Selecting a winding core which is qualified by a short circuit tester after hot pressing, assembling the winding core by the obtained lithium ion battery cathode tab, welding the periphery, entering a shell, testing the short circuit rate of the battery cell after entering the shell by using the short circuit tester, wherein the model of the short circuit tester is SS25-9920, the test voltage is 200mV, the test speed is 100ms, and counting the short circuit rate of the battery cell after entering the shell;
the results are shown in table 3 below:
TABLE 3 test results of examples 1-7 and comparative examples 1-10
| Pre-weld firmness/%) | Cell short circuit rate/%) | |
| Example 1 | 100 | 10 |
| Example 2 | 100 | 8 |
| Example 3 | 88 | 3 |
| Example 4 | 100 | 8 |
| Example 5 | 100 | 8 |
| Example 6 | 100 | 3 |
| Example 7 | 95 | 3 |
| Comparative example 1 | 75 | 20 |
| Comparative example 2 | 70 | 30 |
| Comparative example 3 | 73 | 18 |
| Comparative example 4 | 50 | 33 |
| Comparative example 5 | 70 | 20 |
| Comparative example 6 | 70 | 18 |
| Comparative example 7 | 65 | 18 |
| Comparative example 8 | 80 | 13 |
| Comparative example 9 | 73 | 5 |
| Comparative example 10 | 65 | 3 |
From the above table, it can be seen that: according to the invention, through a secondary welding mode, the welding firmness is obviously improved, meanwhile, the short circuit rate of the battery core is obviously reduced, and the load and the loss of equipment are correspondingly reduced; in the comparative example, the ultrasonic welding parameters are adjusted, so that the influence on improving the welding strength and reducing the short circuit rate is small, the welding energy and the welding time are too long, the generated molten metal chips are increased, the welding time is too short, the energy value is low, and the welding firmness is reduced.
And (3) carrying out subsequent procedures and capacity grading on the lithium ion battery negative electrode tabs obtained in the embodiment 6 and the comparative example 8 to obtain qualified batteries, wherein the rated capacity of the batteries is 25Ah, and the pulse discharge power performance test is carried out under the normal temperature condition: the results of the 30C pulse discharge 10s and 22.5C pulse feedback 10s tests at 10% SOC intervals are shown in fig. 1, and it can be seen from fig. 1 that: the pulse power value of the battery prepared by the lithium ion battery cathode tab obtained by the invention is slightly higher than that of the comparative example.
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 (3)
1. A method for improving the prewelding quality of a cathode tab of a high-power lithium ion battery is characterized by comprising the following steps: arranging a plurality of negative electrode copper lugs to enable one ends of the negative electrode copper lugs to be located on the same plane, performing primary pre-welding by an ultrasonic welding machine, standing, and performing secondary pre-welding, wherein the welding parameters of the primary pre-welding and the secondary pre-welding are the same, and are as follows: the welding energy is 400-450J, the welding pressure is 413.7-551.6kPa, and the welding time is 1-1.5 s.
2. The method for improving the prewelding quality of the negative electrode lug of the high-power lithium ion battery as claimed in claim 1, wherein the size of the negative electrode copper lug is 200mm x 8mm x 10 mm.
3. The method for improving the prewelding quality of the negative electrode tab of the high-power lithium ion battery as claimed in claim 1 or 2, wherein the standing time is 1-3 s.
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| CN104638223A (en) * | 2013-11-11 | 2015-05-20 | 万向A一二三系统有限公司 | Welding structure for plate electrode foils and plate lug of lithium battery |
| CN107671414A (en) * | 2017-09-04 | 2018-02-09 | 中航锂电（洛阳）有限公司 | Lithium ion cell polar ear ultrasonic welding method and tab welding guard method |
| CN108838590A (en) * | 2018-07-13 | 2018-11-20 | 无锡奥特维科技股份有限公司 | A kind of solar battery sheet welding method and device |
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- 2018-12-05 CN CN201811479417.5A patent/CN109742306B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102034950A (en) * | 2009-09-30 | 2011-04-27 | 三洋电机株式会社 | Current carrying block for resistance welding, and method for manufacturing sealed battery and sealed battery using current carrying block |
| CN201783755U (en) * | 2010-08-27 | 2011-04-06 | 严卓晟 | Double-row-teeth ultrasonic die |
| CN203674300U (en) * | 2013-11-11 | 2014-06-25 | 浙江万向亿能动力电池有限公司 | Welding structure for pole piece foil sheet and pole lug of lithium battery |
| CN104638223A (en) * | 2013-11-11 | 2015-05-20 | 万向A一二三系统有限公司 | Welding structure for plate electrode foils and plate lug of lithium battery |
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