CN114473210A - Current collecting disc structure of circular lithium ion battery and welding method - Google Patents
Current collecting disc structure of circular lithium ion battery and welding method Download PDFInfo
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- CN114473210A CN114473210A CN202210098173.6A CN202210098173A CN114473210A CN 114473210 A CN114473210 A CN 114473210A CN 202210098173 A CN202210098173 A CN 202210098173A CN 114473210 A CN114473210 A CN 114473210A
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- current collecting
- collecting disc
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- cutting
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- 238000003466 welding Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 22
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
- B23K20/106—Features related to sonotrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a novel current collecting disc structure of a circular lithium ion battery and a welding method. The current collecting disc structure is provided with a hole in the middle of an anode current collecting disc, 4 fan-shaped cutting lines with unclosed bottoms are uniformly arranged on the anode current collecting disc, two radial cutting straight lines are symmetrically arranged at the root of the fan-shaped cutting lines with unclosed bottoms, a cutting folding line is arranged in the cutting straight lines on the anode current collecting disc, and the corner of the cutting folding line is a round angle; uniformly arranging 4 fan-shaped cutting lines on the positive current collecting disc, symmetrically arranging two radial cutting straight lines at the center of an arc line of each fan-shaped cutting line, arranging cutting folding lines in the areas of the two cutting straight lines of the positive current collecting disc, wherein the turning positions of the cutting folding lines are round corners, and performing bottom welding on the positive current collecting disc and the positive pole; and the negative current collecting plate is welded with the shell by laser. The current collecting disc structure and the welding method are simple and easy, are suitable for various circular full-lug flattening processes, and set the size of the adjustable current collecting disc according to different batteries so as to ensure the overcurrent capacity of the battery core.
Description
Technical Field
The invention relates to the field of lithium ion battery production, in particular to a current collecting disc structure of a circular lithium ion battery and a welding method.
Background
The lithium ion battery is widely applied to the 3C field such as mobile phones, digital cameras and PC computers, and also applied to the field of electric tools, and along with the great support of the state on new energy automobiles, the lithium ion battery also meets the vigorous development opportunities in the field of electric automobiles and electric bicycles since 2011, and among lithium ion batteries of a series of models, the cylindrical aluminum shell lithium ion battery is concerned due to the advantages of high energy density, good safety performance and the like.
The cylindrical aluminum shell lithium ion battery of full utmost point ear is the current commonly used assembly methods, however the difficult problem that full utmost point ear structure cylinder aluminum shell battery faces is how to realize being connected between utmost point ear and the apron utmost point post, consequently, current collection dish becomes the key of connecting battery utmost point ear and apron utmost point post, current common current collection dish is cylinder or square, battery assembly is to place current collection dish at battery utmost point ear terminal surface center, adopt laser welding's mode to become a whole with current collection dish and battery utmost point ear welding afterwards, current collection dish the other end links together through the terminal post of welding or riveted mode with the apron, and then through battery utmost point ear, current collection dish, the connection of utmost point post, make cylindrical aluminum shell lithium ion battery's sealed and current loop.
The conventional current collecting plate structure has poor vibration resistance, is difficult to meet the requirement of no cracking after long-term vibration on a vehicle, and lacks self-protection capability on the interior of a battery when the current is too large. Therefore, a new current collecting plate structure is urgently needed to be developed, and the vibration resistance and overcurrent protection functions of the battery can be effectively solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a current collecting plate structure of a circular lithium ion battery and a welding method.
The invention relates to a novel current collecting disc structure of a circular lithium ion battery, which comprises a negative current collecting disc and a positive current collecting disc, wherein a hole is formed in the middle of the negative current collecting disc, 4 sector cutting lines with unclosed bottoms are uniformly arranged on the negative current collecting disc, the root parts of the sector cutting lines with unclosed bottoms are symmetrically provided with two radial cutting straight lines, a cutting folding line is arranged in the cutting straight line on the negative current collecting disc, and the turning part of the cutting folding line is a round angle; uniformly arranging 4 fan-shaped cutting lines on the positive current collecting disc, symmetrically arranging two radial cutting straight lines at the center of an arc line of each fan-shaped cutting line, arranging cutting folding lines in the areas of the two cutting straight lines of the positive current collecting disc, wherein the turning positions of the cutting folding lines are round corners, and performing bottom welding on the positive current collecting disc and the positive pole; and the negative current collecting plate is welded with the shell by laser.
The current collecting disc structure cuts certain broken line shapes with round corners in the vertical line to perform stress buffering, the anti-vibration capability in the battery is enhanced, welding point open welding after vibration is avoided, the overcurrent protection function is realized through the broken line structure area of the current collecting disc, and the battery is protected through a fusing method in the broken line area if the current is too large. The anode column connecting structure adopts ultrasonic torque welding to increase the flow area of an electrode column and a current collecting disc, the negative electrode shell and the negative current collecting disc adopt laser welding to increase the flow area of the shell and the negative current collecting disc, subsequent sealing is carried out, the welding strength and the sealing performance are ensured, the subsequent anti-vibration capability is improved, and the large-current charging and discharging of a battery can be met.
A novel welding method for a current collecting plate structure of a circular lithium ion battery comprises the following steps:
s1, flattening the wound pole group for the first time and the second time to obtain a pole group A;
s2, laser welding the pole group A obtained in the last step and the negative current collecting disc 4 by using laser welding equipment with preset parameters to obtain a pole group B;
s3, carrying out laser welding on the pole group B obtained in the previous step and the positive current collecting disc 6 to obtain a pole group C;
s4, putting the pole group C obtained in the previous step into a circular shell in which the positive pole gasket 9 is placed;
s5, performing bottom welding on the positive pole post 7 on the shell and the positive current collecting plate 6;
s6, welding the upper part of the shell and the negative current collecting disc 4 by laser;
and S7, placing the battery cover plate on the shell, curling, injecting liquid and sealing.
The number of welding areas in the current collecting disc of the negative current collecting disc (4) and the positive current collecting disc (6) is 3-10, the welding areas in the current collecting disc are fan-shaped, triangular, square, circular, semicircular or trapezoidal, and the welding tool positioning grooves in the edge of the current collecting disc are square.
In step S5, the center of the positive current collecting plate (6) and the positive post at the bottom of the battery shell are subjected to bottom welding by ultrasonic torque welding or laser welding.
The method of the invention has the following advantages:
(1) the current collecting disc structure and the welding method are simple and easy, are suitable for various circular full-lug flattening processes, and set the size of the adjustable current collecting disc according to different batteries so as to ensure the overcurrent capacity of the battery core.
(2) The round battery has elasticity through the cutting structure of the current collecting disc, can realize the vertical separation of a welding part, and increases the vibration resistance of the battery.
(3) The welding method of the circular battery has the advantages of simple process, good repeatability and wide industrial production prospect.
(4) The method can realize the overcurrent protection function through the fold line structure area of the current collecting disc, and protect the battery through a fusing method in the fold line area if the current is too large.
Drawings
FIG. 1 is a top view of an anode current collector disk according to an embodiment of the present invention;
FIG. 2 is a top view of a positive current collecting plate structure according to an embodiment of the present invention;
FIG. 3 is a sectional view showing a welding position of an anode current collecting plate and a leveling layer in an embodiment of the present invention;
FIG. 4 is a sectional view of the welding position of the positive current collecting plate and the flattening layer in the embodiment of the invention;
FIG. 5 is a sectional view of the welding position of the positive current collecting plate and the positive pole column in the embodiment of the present invention;
fig. 6 is a sectional view showing a welding position of an anode current collecting plate and a case according to an embodiment of the present invention.
Detailed Description
The invention will be further explained by the following examples in conjunction with the drawings.
Example 1
A novel structure and a method for cutting tabs of a circular lithium ion battery electrode plate comprise the following steps:
the circular diameter of a circular battery negative pole current collecting disc is designed to be 37mm, the gap width of an outer ring positioning groove is designed to be 1.34mm, the height of the circular battery negative pole current collecting disc is designed to be 2.79mm, the diameter of a central circular hole is designed to be 5.11mm, the radius of a sector area is designed to be 13mm, the angle of the sector area is designed to be 90 degrees, four sectors are designed, a certain area of a cutting opening is reserved at the root of each sector to cut two vertical lines, and a plurality of fold line shapes with round corners are cut in the vertical lines to perform stress buffering (as a structural plan view of the negative pole current collecting disc in figure 1, in the figure, a welding area 11 of a negative pole rubbing flat layer and the negative pole current collecting disc, a welding area 12 of the negative pole current collecting disc and a shell, a central circular hole 13 through which a bottom welding ultrasonic welding head passes, a positioning groove 14 of a negative pole welding tool, and a sector cutting area 15 of the negative pole).
The circular diameter of a circular battery anode current collecting disc is 37mm, the gap width of an outer ring positioning groove is 1.34mm, the height is 2.79mm, the radius of a fan-shaped area is 13mm, the angle is 90 degrees, four fan shapes are designed, a certain area is reserved at the center of a fan-shaped arc shape to cut two vertical lines, and a plurality of broken line shapes with round corners are cut in the vertical lines to perform stress buffering (as shown in a structural top view of the anode current collecting disc in figure 2, in the figure, a welding area 21 of an anode rubbing flat layer and the anode current collecting disc, a welding area 22 of the anode current collecting disc and a shell, a welding area 23 of an anode bottom, a positioning groove 24 of an anode welding tool and a fan-shaped cutting area 25).
The thickness of the negative current collecting disc is 0.2mm, the welding mode is laser spot welding, and the welding shape is triangular (as shown in a sectional view of the welding position of the negative current collecting disc and the flattening layer in fig. 3, the flattened stage group 1, the positive electrode flattening layer 2, the negative electrode flattening layer 3, the negative current collecting disc 4 and the laser welding head position 5 are shown in the figure).
The thickness of the positive current collecting plate is 0.3mm, the welding mode is laser spot welding, and the welding shape is triangular (as a cross section of the welding position of the positive current collecting plate and the flattening layer in a figure 4, in the figure, a flattened stage group 1, a positive electrode flattening layer 2, a negative electrode flattening layer 3, a negative current collecting plate 4, a laser welding head position 5 and a positive current collecting plate 6 are shown).
The positive bottom welding adopts ultrasonic torque welding,the area of a welding head is 13mm2And the thickness of the positive pole is 1.2mm (as shown in a cross section of a welding position of the positive current collecting disc and the positive pole in fig. 5, a level group 1 which is flattened, a positive electrode flattening layer 2, a negative electrode flattening layer 3, a negative current collecting disc 4, a laser welding head position 5, a positive current collecting disc 6, a positive pole 7, a positive cover plate combined structure 8, a positive gasket 9 and an ultrasonic torque bottom welding position 10 of the positive current collecting disc and the positive pole are shown in the figure).
The thickness of the shell is 0.5mm, the steel shell and the copper current collecting disc are continuously welded by laser, the welding track is circular, the welding method is to rotate the circular battery, the inclination angle of the laser head is fixed, and continuous welding is carried out (as shown in a cross section of the welding position of the cathode current collecting disc and the shell in fig. 6, a level group 1 which is flattened, an anode flattening layer 2, a cathode flattening layer 3, a cathode current collecting disc 4, a laser welding head position 5, an anode current collecting disc 6, an anode pole 7, an anode cover plate combined structure 8, an anode gasket 9 and a laser welding head position 11).
Claims (4)
1. A current collecting disc structure of a circular lithium ion battery comprises a negative current collecting disc and a positive current collecting disc, and is characterized in that a hole is formed in the middle of the negative current collecting disc, 4 sector cutting lines with unclosed bottoms are uniformly arranged on the negative current collecting disc, two radial cutting straight lines are symmetrically arranged at the root of the sector cutting lines with unclosed bottoms, a cutting folding line is arranged in the cutting straight line on the negative current collecting disc, and the corner of the cutting folding line is a round angle; uniformly arranging 4 fan-shaped cutting lines on the positive current collecting disc, symmetrically arranging two radial cutting straight lines at the center of an arc line of each fan-shaped cutting line, arranging cutting folding lines in the areas of the two cutting straight lines of the positive current collecting disc, wherein the turning positions of the cutting folding lines are round corners, and performing bottom welding on the positive current collecting disc and the positive pole; and the negative current collecting plate is welded with the shell by laser.
2. The welding method of the current collecting plate structure of the circular lithium ion battery as claimed in claim 1 is characterized by comprising the following implementation steps:
s1, flattening the wound pole group for the first time and the second time to obtain a pole group A;
s2, performing laser welding on the pole group A obtained in the last step and the negative current collecting disc (4) by using laser welding equipment with preset parameters to obtain a pole group B;
s3, carrying out laser welding on the pole group B obtained in the previous step and the positive current collecting disc (6) to obtain a pole group C;
s4, putting the pole group C obtained in the previous step into a circular shell in which a positive pole gasket (9) is placed;
s5, performing bottom welding on the positive pole column (7) on the shell and the positive current collecting plate (6);
s6, welding the upper part of the shell and the negative current collecting disc (4) by laser;
and S7, placing the battery cover plate on the shell, curling, injecting liquid and sealing.
3. The welding method of the current collecting plate structure of the circular lithium ion battery according to claim 2, characterized in that the number of the welding areas inside the current collecting plate of the negative electrode current collecting plate (4) and the positive electrode current collecting plate (6) is 3-10, the welding areas inside the current collecting plate are fan-shaped, triangular, square, circular, semicircular or trapezoidal, and the welding tool positioning groove at the edge of the current collecting plate is square.
4. The method for welding the current collecting plate structure of the circular lithium ion battery according to claim 2, wherein in step S5, the center of the positive current collecting plate (6) is bottom-welded with the positive post at the bottom of the battery shell by ultrasonic torque welding or laser welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210098173.6A CN114473210A (en) | 2022-01-27 | 2022-01-27 | Current collecting disc structure of circular lithium ion battery and welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210098173.6A CN114473210A (en) | 2022-01-27 | 2022-01-27 | Current collecting disc structure of circular lithium ion battery and welding method |
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| Publication Number | Publication Date |
|---|---|
| CN114473210A true CN114473210A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210098173.6A Pending CN114473210A (en) | 2022-01-27 | 2022-01-27 | Current collecting disc structure of circular lithium ion battery and welding method |
Country Status (1)
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| CN (1) | CN114473210A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914634A (en) * | 2022-05-24 | 2022-08-16 | 天津力神电池股份有限公司 | Novel circular lithium ion battery structure and preparation method thereof |
| CN115007994A (en) * | 2022-06-20 | 2022-09-06 | 肇庆小鹏汽车有限公司 | Cylindrical cell pole welding assembly structure and method and battery |
| CN115602906A (en) * | 2022-12-15 | 2023-01-13 | 宁德新能源科技有限公司（Cn） | Cylindrical secondary battery and electronic device |
| CN115692956A (en) * | 2022-11-07 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Battery, energy storage device and electric equipment |
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| CN212934806U (en) * | 2020-09-18 | 2021-04-09 | 合肥国轩高科动力能源有限公司 | Full utmost point ear type cylinder lithium ion battery current collection dish structure |
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2022
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114914634A (en) * | 2022-05-24 | 2022-08-16 | 天津力神电池股份有限公司 | Novel circular lithium ion battery structure and preparation method thereof |
| CN115007994A (en) * | 2022-06-20 | 2022-09-06 | 肇庆小鹏汽车有限公司 | Cylindrical cell pole welding assembly structure and method and battery |
| CN115692956A (en) * | 2022-11-07 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Battery, energy storage device and electric equipment |
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