CN109148806A - The cell polar ear and top cover connection method and connection structure of power battery - Google Patents
The cell polar ear and top cover connection method and connection structure of power battery Download PDFInfo
- Publication number
- CN109148806A CN109148806A CN201810786970.7A CN201810786970A CN109148806A CN 109148806 A CN109148806 A CN 109148806A CN 201810786970 A CN201810786970 A CN 201810786970A CN 109148806 A CN109148806 A CN 109148806A
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- Prior art keywords
- polar ear
- cell polar
- top cover
- screening glass
- welding
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Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a kind of cell polar ear of power battery and top cover connection method, the cell polar ear of the ultrasonic pre- postwelding of prewelding-ultrasound of cell polar ear and screening glass and the laser welding of top cover pole；And the connection structure of preparation, including top cover, cell polar ear and screening glass, between the top cover pole and the screening glass, the screening glass and each layer of tab monolithic are welded with the top cover pole cell polar ear.Cell polar ear and screening glass pass through ultrasonic prewelding and directly pass through laser welding on top cover pole; pass through the control of link position and welding procedure; while guaranteeing quality of connection; both simplify process; large power supersonic bonding machine and connecting plate material are eliminated again; link cost is greatly reduced, the performance requirement of power battery high rate charge-discharge is met.
Description
Technical field
The invention belongs to lithium ion power battery technology fields, and in particular to a kind of cell polar ear and top cover of power battery
Connection method and connection structure.
Background technique
Electric car especially passenger car is higher and higher to the high rate charge-discharge performance requirement of power battery, is meeting electricity
When the high-power charge-discharge performance of electrical automobile, need to consider power battery high current water conservancy diversion problem, if due to temperature steeply rises
Cause tab or pole to fuse, serious safety problem will be generated.Therefore, the connection of cell polar ear and top cover pole safely may be used
It is most important by property.
Traditional cell polar ear and top cover connection type are as follows: cell polar ear and screening glass are welded together in advance by ultrasound, in advance
The cell polar ear of postwelding is by being ultrasonically welded on connecting plate, and connecting plate passes through laser welding on top cover pole again, this company
Process requirement ultrasonic welding process and a laser welding process twice are connect, and second of ultrasonic bonding machine power is big, at high cost,
It needs to increase by one piece of connecting plate simultaneously, so not only complex procedures, also adds production cost.
Summary of the invention
The purpose of the present invention is to the deficiency of above-mentioned technology, a kind of simple and reliable process is provided and substantially reduces cost
Power battery cell polar ear and top cover connection method and connection structure.
To achieve the above object, the cell polar ear of the power battery designed by the present invention and top cover connection method, including such as
Lower step:
1) the ultrasonic prewelding of cell polar ear and screening glass
Screening glass is placed on to the middle position on the upper surface of cell polar ear and being located at cell polar ear, then will be surpassed
Sonic soldering soldering tip is in contact with screening glass upper surface welds a point formation ultrasonic bond point, and welding position is in screening glass middle position；
2) laser welding of the cell polar ear of the pre- postwelding of ultrasound and top cover pole
By the cell polar ear of pre- postwelding be placed on top cover pole and screening glass upward, welding fixture is by the battery core of pre- postwelding
Tab is pressed together with top cover pole, and then laser welding forms Laser Welding print.
Further, cell polar ear is cell polar ear made of 20~60 layers of tab monolithic stack in the step 1), just
Each layer of tab single-sheet thickness of pole is 0.010~0.020mm, each layer of tab single-sheet thickness of cathode be 0.006~
0.012mm, and the dislocation of adjacent two layers tab monolithic requires as < ± 0.5mm；Positive cell polar ear weld when amplitude be 30~
50um, energy are 90~110J, power is 800~1400W, and amplitude when cathode battery core tab welding is 40~60um, energy
It is 1700~2600W for 250~290J, power.
Further, in the step 2) top cover pole with a thickness of 0.5~2mm, when positive cell polar ear laser welding
Bonding power be 3000~4000W, speed of welding is 100~140mm/s, welding function when cathode cell polar ear laser welding
Rate is 5000~6500W, speed of welding is 100~140mm/s.
Further, the position deviation of screening glass and cell polar ear < ± 0.5mm in the step 1),
Further, in the step 1) ultrasonic bond spot welding line having a size of 5mm × 20mm, and ultrasonic bond position deviation <
±0.5mm。
Further, Laser Welding print is covered on the ultrasonic bond spot welding line of ultrasonic prewelding in the step 2).
A kind of connection structure of the cell polar ear of power battery as described above and top cover connection method preparation, including top
Lid, cell polar ear and screening glass, the cell polar ear positioned at the top cover pole and the screening glass between, the screening glass with
Each layer of tab monolithic is welded with the top cover pole.
Compared with prior art, the invention has the following advantages that connection method of the present invention is that cell polar ear and screening glass are logical
It crosses ultrasonic prewelding and directly passes through laser welding on top cover pole, by the control of link position and welding procedure, guaranteeing to connect
While connecing quality, not only simplify process, but also eliminates large power supersonic bonding machine and connecting plate material, the company of greatly reducing
It is connected into this, meets the performance requirement of power battery high rate charge-discharge.
Detailed description of the invention
Fig. 1 is that screening glass of the present invention and cell polar ear weld schematic diagram；
Fig. 2 is that cell polar ear of the present invention and top cover weld schematic diagram.
Each part numbers are as follows in figure:
Cell polar ear 1, screening glass 2, ultrasonic bond spot welding line 3, top cover 4, pole 5, Laser Welding print 6.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The cell polar ear of power battery and top cover connection method, include the following steps:
1) the ultrasonic prewelding of cell polar ear 1 and screening glass 2
Screening glass 2 is placed on to the middle position on the upper surface of cell polar ear 1 and being located at cell polar ear 1, screening glass
2 with position deviation < ± 0.5mm of cell polar ear 1, it is ensured that each layer of tab monolithic stress more evenly, presses more smooth, more
Closely；After 2 feeding of screening glass, screening glass 2 and cell polar ear 1 are clamped and are flattened by welding fixture, then by ultrasonic bond soldering tip with
2 upper surface of screening glass, which is in contact, welds a point formation ultrasonic bond point, and ultrasonic bond spot welding line 3 is having a size of 5mm × 20mm, welding position
It sets in 2 middle position of screening glass (as shown in Figure 1), and ultrasonic bond position deviation < ± 0.5mm；
In the present embodiment, cell polar ear 1 is cell polar ear made of 20~60 layers of tab monolithic stack, positive each layer
Tab single-sheet thickness is 0.010~0.020mm, each layer of tab single-sheet thickness of cathode is 0.006~0.012mm, and adjacent
The dislocation of two layers of tab monolithic requires as < ± 0.5mm；Screening glass is double-layer structure, the lower surface of lower layer and most upper one layer of tab
The upper surface of monolithic is in contact, and plays the role of flattening cell polar ear, the upper surface on upper layer is in contact with ultrasonic bond soldering tip, plays
The effect for absorbing welding energy, protecting cell polar ear.Amplitude when positive cell polar ear welds is 30~50um, energy be 90~
110J, power are 800~1400W, and amplitude when cathode battery core tab welding is 40~60um, energy is 250~290J, power
For 1700~2600W.First is that for the close pressing between screening glass and cell polar ear, between cell polar ear and cell polar ear,
Second is that the welding of cell polar ear upper end dislocation bring not exclusively causes water conservancy diversion area that cannot meet design requirement in order to prevent, three
It is cell polar ear and screening glass security risk caused by breakage due to welded because crossing in order to prevent；
2) laser welding of the cell polar ear 1 of the pre- postwelding of ultrasound and 4 pole 5 of top cover
By the cell polar ear 1 of pre- postwelding be placed on 4 pole 5 of top cover and screening glass 2 upward, as shown in Fig. 2, welding fixture
The cell polar ear 1 of pre- postwelding and 4 pole 5 of top cover are closely pressed together on together, then the laser of laser welding twice 4mm × 20mm
Weldering print 6, as shown in Fig. 2, Laser Welding print 6 is covered on the ultrasonic bond spot welding line 3 of ultrasonic prewelding；
In the present embodiment, the welding function with a thickness of 0.5~2mm, when positive cell polar ear laser welding of 4 pole 5 of top cover
Rate is 3000~4000W, speed of welding is 100~140mm/s, and bonding power when cathode cell polar ear laser welding is 5000
~6500W, speed of welding are 100~140mm/s, guarantee laser successively complete penetration screening glass, each layer of tab monolithic and top
Lid pole, so that the connection between top cover and cell polar ear is safe and reliable.
As shown in Fig. 2, the connection structure of the cell polar ear of power battery and top cover connection method preparation, including top cover 4, electricity
Core tab 1 and screening glass 2, cell polar ear 1 are located between 4 pole 5 of top cover and screening glass 2, screening glass 2 and each layer of tab monolithic
Welded with 4 pole 5 of top cover.
Connection method of the present invention is that cell polar ear and screening glass pass through ultrasonic prewelding and directly pass through laser welding in top cover pole
On column, process is not only simplified, but also save while guaranteeing quality of connection by the control of link position and welding procedure
Large power supersonic bonding machine and connecting plate material, greatly reduce link cost, meet power battery high rate charge-discharge
Performance requirement.
Embodiment 1
Every layer of tab single-sheet thickness of positive cell polar ear is 0.012mm, the number of plies is 50 layers, every layer of cathode cell polar ear
Tab single-sheet thickness is 0.008mm, the number of plies is 50 layers.Screening glass, which is placed on cell polar ear, to be clamped and flattens, ultrasonic prewelding one
The ultrasonic solder joint of a 5mm × 20mm；Positive cell polar ear weld when amplitude be 35um, energy 90J, power 900W, bear
Pole cell polar ear weld when amplitude be 45um, energy 260J, power 1800W.The cell polar ear of pre- postwelding is placed on top
On lid pole, top cover pole with a thickness of 1mm, clamp flattening, two 4mm × 20mm Laser Weldings prints of laser welding, Laser Welding print
It is covered on ultrasonic bond spot welding line；Bonding power when positive cell polar ear laser welding is 3000W, speed of welding 130mm/
S, bonding power when cathode cell polar ear laser welding is 5400W, speed of welding 130mm/s.Obtain sample 1,2 and of sample
Sample 3.
Embodiment 2
Every layer of tab single-sheet thickness of positive cell polar ear is 0.015mm, the number of plies is 45 layers, every layer of cathode cell polar ear
Tab single-sheet thickness is 0.01mm, the number of plies is 45 layers.Screening glass, which is placed on cell polar ear, to be clamped and flattens, ultrasonic prewelding one
The ultrasonic solder joint of 5mm × 20mm；Positive cell polar ear weld when amplitude be 40um, energy 100J, power 1200W, bear
Pole cell polar ear weld when amplitude be 50um, energy 300J, power 2000W.The cell polar ear of pre- postwelding is placed on top
On lid pole, top cover pole with a thickness of 1mm, clamp flattening, two 4mm × 20mm Laser Weldings prints of laser welding, Laser Welding print
It is covered on ultrasonic bond spot welding line；Bonding power when positive cell polar ear laser welding is 3500W, speed of welding 130mm/
S, bonding power when cathode cell polar ear laser welding is 6000W, speed of welding 130mm/s.Obtain sample 4,5 and of sample
Sample 6.
Comparative example
Every layer of tab single-sheet thickness of positive cell polar ear is 0.015mm, the number of plies is 45 layers, every layer of cathode cell polar ear
Tab single-sheet thickness is 0.01mm, the number of plies is 45 layers.Screening glass, which is placed on cell polar ear, to be clamped and flattens, ultrasonic prewelding two
The ultrasonic solder joint of 3mm × 6mm, ultrasonic solder joint branch office is at screening glass both ends；Amplitude when positive cell polar ear welds is 45um, energy
Amount is 120J, power 1000W, and amplitude when cathode battery core tab welding is 55um, energy 320J, power 2000W.In advance
The cell polar ear of postwelding is placed on connecting plate, and connection plate thickness 2mm is clamped and flattened, and one 3mm × 14mm's of ultrasonic welding is super
Sonic soldering point, ultrasonic bond point are located at connecting plate middle position；Positive cell polar ear weld when amplitude be 55um, energy 380J,
Power is 2700W, and amplitude when cathode battery core tab welding is 65um, energy 950J, power 3500W.Again connecting plate
It is placed on top cover pole, pole thickness 1mm is clamped and flattened, three 4mm × 20mm Laser Welding prints of laser welding, positive battery core
Bonding power when tab laser welding is 4500W, speed of welding 120mm/s, weldering when cathode cell polar ear laser welding
Connect power be 7500W, speed of welding 120mm/s.Obtain sample 7, sample 8 and sample 9.
Test result is as follows shown in table 1 by range estimation surface quality, test pulling force and high current temperature rise for above-mentioned nine samples,
It can be seen that the sample prepared using the cell polar ear of power battery of the present invention and the embodiment 1 of top cover connection method and embodiment 2
Condition has obvious preferable connection effect for comparative example.
1 nine sample tests of table
Claims (7)
1. a kind of cell polar ear of power battery and top cover connection method, it is characterised in that: the connection method includes following step
It is rapid:
1) the ultrasonic prewelding of cell polar ear (1) and screening glass (2)
Screening glass (2) is placed on to the middle position on the upper surface of cell polar ear (1) and being located at cell polar ear (1), then
Ultrasonic bond soldering tip is in contact with screening glass (2) upper surface one point formation ultrasonic bond point of welding, and welding position is in screening glass (2)
Middle position；
2) laser welding of the cell polar ear (1) of the pre- postwelding of ultrasound and top cover (4) pole (5)
By the cell polar ear (1) of pre- postwelding be placed on top cover (4) pole (5) and screening glass (2) upward, welding fixture is by prewelding
Cell polar ear (1) afterwards is pressed together with top cover (4) pole (5), and then laser welding forms Laser Welding print (6).
2. the cell polar ear of power battery and top cover connection method according to claim 1, it is characterised in that: the step 1)
Middle cell polar ear (1) is cell polar ear made of 20~60 layers of tab monolithic stack, and each layer of positive tab single-sheet thickness is
0.010~0.020mm, cathode each layer of tab single-sheet thickness be 0.006~0.012mm, and adjacent two layers tab monolithic
Dislocation requires as < ± 0.5mm；Amplitude when positive cell polar ear welds is 30~50um, energy is 90~110J, power is
800~1400W, amplitude when cathode battery core tab welding is 40~60um, energy is 250~290J, power be 1700~
2600W。
3. the cell polar ear of power battery and top cover connection method according to claim 1, it is characterised in that: the step 2)
Middle top cover (4) pole (5) with a thickness of 0.5~2mm, bonding power when positive cell polar ear laser welding is 3000~
4000W, speed of welding are 100~140mm/s, and bonding power when cathode cell polar ear laser welding is 5000~6500W, weldering
Connecing speed is 100~140mm/s.
4. the cell polar ear of according to claim 1 or 2 or 3 power batteries and top cover connection method, it is characterised in that: described
Position deviation < ± 0.5mm of screening glass (2) and cell polar ear (1) in step 1).
5. the cell polar ear of according to claim 1 or 2 or 3 power batteries and top cover connection method, it is characterised in that: described
Ultrasonic bond spot welding line (3) is having a size of 5mm × 20mm in step 1), and ultrasonic bond position deviation < ± 0.5mm.
6. the cell polar ear of according to claim 1 or 2 or 3 power batteries and top cover connection method, it is characterised in that: described
Laser Welding print (6) is covered on the ultrasonic bond spot welding line (3) of ultrasonic prewelding in step 2).
7. the connection structure of a kind of cell polar ear of power battery as described in claim 1 and top cover connection method preparation, including
Top cover (4), cell polar ear (1) and screening glass (2), it is characterised in that: the cell polar ear (1) is located at the top cover (4) pole
(5) between the screening glass (2), the screening glass (2) and each layer of tab monolithic are welded with the top cover (4) pole (5)
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810786970.7A CN109148806A (en) | 2018-07-18 | 2018-07-18 | The cell polar ear and top cover connection method and connection structure of power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810786970.7A CN109148806A (en) | 2018-07-18 | 2018-07-18 | The cell polar ear and top cover connection method and connection structure of power battery |
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| CN109148806A true CN109148806A (en) | 2019-01-04 |
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| CN201810786970.7A Pending CN109148806A (en) | 2018-07-18 | 2018-07-18 | The cell polar ear and top cover connection method and connection structure of power battery |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109860497A (en) * | 2019-01-18 | 2019-06-07 | 湖北锂诺新能源科技有限公司 | A kind of welding method of Multilayer pole ear battery |
| CN110948111A (en) * | 2019-12-09 | 2020-04-03 | 多氟多新能源科技有限公司 | Composite welding method for tab of soft package lithium ion battery |
| CN112453735A (en) * | 2020-10-09 | 2021-03-09 | 湖北亿纬动力有限公司 | Tab welding method, battery manufacturing method and battery |
| CN112652865A (en) * | 2020-07-15 | 2021-04-13 | 中航锂电（洛阳）有限公司 | Battery and battery manufacturing method |
| CN113751906A (en) * | 2021-08-31 | 2021-12-07 | 惠州亿纬锂能股份有限公司 | Lug welding method, battery core lug and battery |
| CN114300814A (en) * | 2021-12-17 | 2022-04-08 | 上海瑞浦青创新能源有限公司 | Pole structure for non-isopolar lug and top cover, welding method and lithium battery |
| CN115026670A (en) * | 2022-02-11 | 2022-09-09 | 湖南领湃达志科技股份有限公司 | Auxiliary welding device and welding method for connecting sheet of lithium ion battery |
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| CN114300814A (en) * | 2021-12-17 | 2022-04-08 | 上海瑞浦青创新能源有限公司 | Pole structure for non-isopolar lug and top cover, welding method and lithium battery |
| CN114300814B (en) * | 2021-12-17 | 2024-04-16 | 上海瑞浦青创新能源有限公司 | Pole structure for unequal pole lugs and top cover, welding method and lithium battery |
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Application publication date: 20190104 |
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