CN109742306A - A method of improving high-power lithium ion power battery negative lug prewelding quality - Google Patents
A method of improving high-power lithium ion power battery negative lug prewelding quality Download PDFInfo
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- CN109742306A CN109742306A CN201811479417.5A CN201811479417A CN109742306A CN 109742306 A CN109742306 A CN 109742306A CN 201811479417 A CN201811479417 A CN 201811479417A CN 109742306 A CN109742306 A CN 109742306A
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- prewelding
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of methods for improving high-power lithium ion power battery negative lug prewelding quality, include the following steps: to carry out several cathode copper polar ears to arrange that one end of cathode copper polar ear is made to be in same plane, prewelding is carried out using ultrasonic welding machine, it stands, then carries out secondary prewelding.The method proposed by the present invention for improving high-power lithium ion power battery negative lug prewelding quality, by way of secondary welding, it reduces the energy value needed when welding and welds lower pressure, the generation of metal fillings is reduced, and improves firm welding degree, promotes the power-performance of battery, reduce the short circuit ratio of the battery core of production process, the power consistency of high power lithium ion cell is promoted and process modification provides technical support, improves cost batteries first-pass yield, reduces enterprise's production cost.
Description
Technical field
The present invention relates to technical field of lithium ion more particularly to a kind of raising high-power lithium ion power battery cathode
The method of tab prewelding quality.
Background technique
Important component of the lithium-ion-power cell as electric vehicle, performance directly affect normally making for electric vehicle
With.Because of its popularization and application, electrical property and security performance obtain extensive concern.Domestic two technology paths difference main at present
High-power lithium ion power battery and pure electric vehicle high-energy type lithium-ion-power cell technology, wherein pure electric vehicle high-energy lithium from
Sub- battery is influenced by battery raw material gram volume, and certain technical difficulty is substantially improved in energy density.It is dynamic for high power
Power lithium ion battery, the main power-performance for considering battery, at present market application be mostly 12V vehicle-mounted start and stop power supply
With the light mixed power onboard system of 48V, the market demand is gradually increased.But the power density of high-power lithium ion power battery mentions
It rises, in addition to the conductivity of positive and negative pole material, technological parameter and electrolyte with battery has outside the Pass, the design of battery structure part is also extremely
It closes important.Battery manufacturer promotes the area of passage of battery by the design method of the full extreme ear structure part in two sides mostly at present, thus
Improve the multiplying power and power-performance of battery.
The consistency of high power power battery power-performance and the welding manner and quality of tab are contacted in the presence of close, are welded
The inconsistency for connecing quality has seriously affected the power-performance performance of battery, and because high-power battery bonding area mentioning
It rises, tab prewelding is increasingly complex relative to the welding of energy-type cells, generates more metal fillings during causing, causes power
The self discharge of type battery is larger, and battery core short circuit ratio is higher than energy-type cells.
Summary of the invention
Technical problems based on background technology, it is negative that the invention proposes a kind of raising high-power lithium ion power batteries
The method of pole tab prewelding quality is reduced the energy value needed when welding and welds lower pressure, subtracted by way of secondary welding
The generation of few metal fillings, and firm welding degree is improved, the power-performance of battery is promoted, the short circuit of the battery core of production process is reduced
Rate promotes the power consistency of high power lithium ion cell and process modification provides technical support, it is straight-through to improve cost batteries
Rate reduces enterprise's production cost.
A kind of method improving high-power lithium ion power battery negative lug prewelding quality proposed by the present invention, including such as
Lower step: several cathode copper polar ears, which arrange, makes one end of cathode copper polar ear be in same plane, using ultrasonic bonding
Machine carries out a prewelding, stands, then carries out secondary prewelding.
Preferably, the size of cathode copper polar ear is 200mm × 8mm × 10mm.
Preferably, a prewelding is identical as the welding parameter of secondary prewelding.
Preferably, welding parameter is as follows: welding energy 350-450J, and welding lower pressure is 413.7-551.6kPa, weldering
Connecing the time is 0.5-1.5s.
Preferably, time of repose 1-3s.
The present invention passes through the welding jail to each parameter of negative lug prewelding in high-power lithium ion power battery manufacturing process
The experiment of soundness and battery core short circuit ratio, the method for developing novel secondary welding carry out prewelding, reduce ultrasonic welding system
Required energy value and shorten weld interval, improves welding quality, battery core caused by reducing because of the metal fillings that generates in welding process
Micro-short circuit improves the yield rate of process, reduces the production cost of battery, provides technology branch to the welding of high-power battery structural member
It holds, guarantees the consistency of battery in process of production, reduce security risk existing for vehicle operational process, have to actual production non-
Often important directive significance.
Detailed description of the invention
Fig. 1 is using cell pulse discharge power made from 8 gained lithium ionic cell cathode ear pole of embodiment 6 and comparative example
Performance test figure.
Specific embodiment
In the following, technical solution of the present invention is described in detail by specific embodiment.
Embodiment
A method of high-power lithium ion power battery negative lug prewelding quality is improved, is included the following steps: 5
Arrange having a size of 200mm × 8mm × 10mm cathode copper polar ear makes one end of cathode copper polar ear be in same plane, uses
Ultrasonic welding machine carries out a prewelding, stands, then carries out secondary prewelding；Wherein the welding of a prewelding and secondary prewelding is joined
Number is identical.
By adjusting welding energy value in welding process, welding lower pressure and weld interval, the welding parameter of embodiment 1-7
It is as shown in table 1 below:
1 embodiment 1-7 welding parameter of table
| Welding energy value/J | Weld lower pressure/kPa | Weld interval/s | |
| Embodiment 1 | 450 | 551.60 | 1.5 |
| Embodiment 2 | 400 | 551.60 | 1.5 |
| Embodiment 3 | 350 | 551.60 | 1.5 |
| Embodiment 4 | 400 | 482.65 | 1.5 |
| Embodiment 5 | 400 | 413.70 | 1.5 |
| Embodiment 6 | 400 | 413.70 | 1 |
| Embodiment 7 | 400 | 413.70 | 0.5 |
Comparative example
A kind of pre- soldering method of high-power lithium ion power battery negative lug, include the following steps: by 5 having a size of
200mm × 8mm × 10mm cathode copper polar ear, which arrange, makes one end of cathode copper polar ear be in same plane, using ultrasonic wave
Bonding machine carries out a prewelding.
By adjusting welding energy value in welding process, welding lower pressure and weld interval, the welding ginseng of comparative example 1-10
Number is as shown in table 2 below:
2 comparative example 1-10 welding parameter of table
| Welding energy value/J | Weld lower pressure/kPa | Weld interval/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 |
By lithium ionic cell cathode ear pole obtained by lithium ionic cell cathode ear pole obtained by embodiment 1-7 and comparative example 1-10 into
Row test:
I, weight pulling experiment is carried out, is considered as firm welding if pulling force is greater than 300N, records the secured qualification rate of welding；
II, the core through short circuit tester test passes after hot pressing is selected, is assembled through gained lithium ionic cell cathode ear pole,
After periphery welds, enters shell, and enter the battery core short circuit ratio after shell, short circuit tester model SS25- after being tested with short circuit tester
9920, test voltage 200mV, test speed 100ms count battery core short circuit ratio after shell；
Its result is as shown in table 3 below:
3 embodiment 1-7 of table and comparative example 1-10 test result
| Secured rate/the % of prewelding | Battery core short circuit ratio/% | |
| Embodiment 1 | 100 | 10 |
| Embodiment 2 | 100 | 8 |
| Embodiment 3 | 88 | 3 |
| Embodiment 4 | 100 | 8 |
| Embodiment 5 | 100 | 8 |
| Embodiment 6 | 100 | 3 |
| Embodiment 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 |
As seen from the above table: the present invention is significantly improved by secondary welding mode, firm welding degree, while battery core short circuit ratio is bright
Aobvious decline, load and loss to equipment also accordingly reduce；And ultrasonic welding parameter is adjusted in comparative example, it is strong for improving welding
Degree and reduction short circuit ratio influence are smaller, and welding energy and weld interval are too long, and the molten metal bits of generation increase, weld interval
It is too short low with energy value, the decline of firm welding degree.
By embodiment 6 and 8 gained lithium ionic cell cathode ear pole of comparative example after subsequent handling and partial volume spec battery, electricity
Pond rated capacity is 25Ah, carries out the test of pulsed discharge power-performance under normal temperature condition: carrying out 30C pulse every 10%SOC and puts
Electric 10s, 22.5C pulse feedback 10s test, result is as shown in Figure 1, as can be seen from FIG. 1: using present invention gained lithium-ion electric
Battery impulse performance number made from the negative lug of pond is slightly above comparative example.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of method for improving high-power lithium ion power battery negative lug prewelding quality, which is characterized in that including as follows
Step: several cathode copper polar ears, which arrange, makes one end of cathode copper polar ear be in same plane, using ultrasonic welding machine
A prewelding is carried out, stands, then carries out secondary prewelding.
2. the method for improving high-power lithium ion power battery negative lug prewelding quality according to claim 1, feature
It is, the size of cathode copper polar ear is 200mm × 8mm × 10mm.
3. the method according to claim 1 or claim 2 for improving high-power lithium ion power battery negative lug prewelding quality, special
Sign is that one time prewelding is identical as the welding parameter of secondary prewelding.
4. any one of -3 side for improving high-power lithium ion power battery negative lug prewelding quality according to claim 1
Method, which is characterized in that welding parameter is as follows: welding energy 350-450J, welding lower pressure is 413.7-551.6kPa, welding
Time is 0.5-1.5s.
5. any one of -4 side for improving high-power lithium ion power battery negative lug prewelding quality according to claim 1
Method, which is characterized in that time of repose 1-3s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479417.5A CN109742306B (en) | 2018-12-05 | 2018-12-05 | Method for improving prewelding quality of negative electrode tab of high-power lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479417.5A CN109742306B (en) | 2018-12-05 | 2018-12-05 | Method for improving prewelding quality of negative electrode tab of high-power lithium ion battery |
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| Publication Number | Publication Date |
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| CN109742306A true CN109742306A (en) | 2019-05-10 |
| CN109742306B CN109742306B (en) | 2021-10-29 |
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| CN201811479417.5A Active CN109742306B (en) | 2018-12-05 | 2018-12-05 | Method for improving prewelding quality of negative electrode tab of high-power lithium ion battery |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201783755U (en) * | 2010-08-27 | 2011-04-06 | 严卓晟 | Double-row-teeth ultrasonic die |
| 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 |
| 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 |
| CN104466075A (en) * | 2014-12-29 | 2015-03-25 | 昆山斯格威电子科技有限公司 | Connecting structure of lithium battery plate lugs and poles and manufacturing method thereof |
| 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 |
-
2018
- 2018-12-05 CN CN201811479417.5A patent/CN109742306B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104466075A (en) * | 2014-12-29 | 2015-03-25 | 昆山斯格威电子科技有限公司 | Connecting structure of lithium battery plate lugs and poles and manufacturing method thereof |
| 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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| CN109742306B (en) | 2021-10-29 |
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