CN116315479A - Method for rubbing and flattening all lugs of cylindrical battery - Google Patents
Method for rubbing and flattening all lugs of cylindrical battery Download PDFInfo
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- CN116315479A CN116315479A CN202310247672.1A CN202310247672A CN116315479A CN 116315479 A CN116315479 A CN 116315479A CN 202310247672 A CN202310247672 A CN 202310247672A CN 116315479 A CN116315479 A CN 116315479A
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- rolling
- rubbing
- flattening
- cylindrical battery
- pole lugs
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000003466 welding Methods 0.000 claims abstract description 43
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 239000003792 electrolyte Substances 0.000 claims abstract description 25
- 238000007493 shaping process Methods 0.000 claims abstract description 23
- 230000008595 infiltration Effects 0.000 claims abstract description 18
- 238000001764 infiltration Methods 0.000 claims abstract description 18
- 238000004898 kneading Methods 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 7
- 238000012797 qualification Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 10
- 238000009736 wetting Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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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
- H01M50/531—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- 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)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a cylindrical battery full-tab flattening method, which comprises the following steps: s1: the pole lugs are rolled in a reciprocating way through a rubbing mechanism and are pre-rubbed and flattened, so that the pole lugs are gathered and pre-shaped; s2: and rubbing and shaping the pole lugs after gathering and pre-shaping through a rubbing and shaping mechanism, and forming regularly arranged electrolyte infiltration areas and current collecting disc welding areas. According to the invention, the pole lugs can be gathered and pre-shaped by the reciprocating rolling of the pole lugs through the rubbing mechanism, the arrangement mode of the pole lugs is optimized under the condition of ensuring the flatness and thickness of the rubbing plane, the rubbing mechanism is used for rubbing and shaping the gathered and pre-shaped pole lugs and forming regularly arranged electrolyte infiltration areas and collector plate welding areas, the metal scraps in the rubbing process are reduced, the poor short circuit is improved, and the welding qualification rate and electrolyte infiltration rate of the collector plates are improved through the main function distinction of different areas of the pole lugs.
Description
Technical Field
The invention relates to the technical field of cylindrical battery lug flattening, in particular to a cylindrical battery full lug flattening method.
Background
The full lug rubbing process is a key process in the manufacturing process of the large cylindrical battery. After winding, the pole lugs are kneaded flat, the upright pole lugs of the cylindrical battery core are kneaded flat into a flat plane, each layer of pole lugs are in close contact, and then the pole lug ends are welded by the current collecting disc. The thickness, compactness and flatness of the kneading plane have great influence on the welding effect of the collecting disc and the electrolyte infiltration efficiency. Through optimizing and rubbing square formula, can improve to a certain extent and rub and level the metal fillings, reduce the problem such as arousing short circuit, promote the mass flow dish welding qualification rate, improve electrolyte infiltration effect.
At present, a rubbing mode for rubbing all lug electric core lugs in the industry is adopted, and the textures of the lug plane lugs are too disordered after rubbing, so that metal scraps are dropped from the lugs in the rubbing process, the risk of short circuit is high, and too large feeding amount in the rubbing process can lead to dense rubbing planes and influence the wetting rate of electrolyte and the edge cladding state of the pole pieces; the feeding amount in the kneading process is too small, the kneading plane is loose and not smooth enough, and the welding process of the collecting plate is easy to produce welding through and poor cold joint.
The patent document with the prior patent publication number of CN114361555A discloses a full-tab cylindrical battery flattening method and a full-tab cylindrical battery, wherein the method comprises the following steps: rotating the first rubbing wheel from the outer ring of the electric core rubbing plane to a first position in the center direction; and the second rubbing wheel rotates to a second position from the center of the electric core rubbing plane to the outer circle direction, and the path of the first rubbing wheel and the path of the second rubbing wheel do not overlap. The method can ensure that the thickness of the kneading plane of the welding area of the current collecting disc is effectively increased under the condition that the foil of the electrode lug is not increased, meanwhile, the thickness of a non-welding area is reduced, the welding yield of the current collecting disc is improved, the infiltration rate of electrolyte is improved, and meanwhile, the problem that the kneading plane shields the central hole is solved.
However, the device still has the following problems:
1. in the process of rubbing the second rubbing wheel outwards from the center of the battery cell, the polar lugs are torn, scraps are more easily dropped, and poor short circuit is caused to rise;
2. the outer ring tab kneaded by the first kneading wheel has no great difference from the traditional kneading outer ring, and the thickness and the infiltration efficiency of the non-welding area are improved only to a limited extent;
3. the lug thickening area is annularly distributed on the end face of the battery cell, the welding marks are distributed on a section of pole piece close to the middle of the winding core, the current passing through the pole pieces on the outer side and the inner side of the battery cell is reduced, the thickness distribution uniformity fluctuation is large, and the welding effect is not well controlled.
Disclosure of Invention
The invention aims to solve the technical problems of optimizing the morphology of the pole lugs after rubbing, improving the welding qualification rate of the current collecting disc and improving the infiltration efficiency of electrolyte.
The invention solves the technical problems by the following technical means: a cylindrical battery full-tab rubbing and flattening method comprises the following steps:
s1: the pole lugs are rolled in a reciprocating way through a rubbing mechanism and are pre-rubbed and flattened, so that the pole lugs are gathered and pre-shaped;
s2: and rubbing and shaping the pole lugs after gathering and pre-shaping through a rubbing and shaping mechanism, and forming regularly arranged electrolyte infiltration areas and current collecting disc welding areas.
The pole lugs can be gathered together and pre-shaped through the reciprocating rolling of the pole lugs by the rubbing mechanism, the arrangement mode of the pole lugs is optimized under the condition of guaranteeing the flatness and thickness of the rubbing plane, the pole lugs after gathering and pre-shaping are rubbed and shaped through the rubbing mechanism, electrolyte infiltration areas and current collecting disc welding areas which are regularly arranged are formed, metal scraps are reduced in the rubbing process, poor short circuit is improved, and the welding qualification rate and electrolyte infiltration rate of the current collecting discs are improved through main function distinction of different areas of the pole lugs.
As a preferable technical solution, the reciprocating rolling in the step S1 includes the following steps:
s1-1: the kneading mechanism rotates clockwise from the initial position to pre-shape the tab in the electric core kneading plane and reaches the first position;
s1-2: the rubbing mechanism rotates anticlockwise from the first position to the second position;
s1-3: the rubbing mechanism rotates clockwise from the second position and returns to the first position.
Through the three steps, the electrode lugs can form a flat current collecting disc welding area in which electrolyte wetting areas and electrode lugs are regularly arranged and double layers of the electrode lugs are overlapped, metal scraps are reduced from falling, the risk of poor short circuit of the battery cell is reduced, electrolyte can enter the orderly laminated wetting areas at a higher speed, and the electrolyte wetting rate is improved; and after the gathering area formed by gathering and shaping is flattened, the lug forms a double-layer overlapped current collecting disc welding area, a larger welding process window can be obtained, and the welding process has remarkable effect on poor welding or cold welding of the current collecting disc.
In the preferred technical scheme, in the step S2, the rubbing mechanism starts to rotate from the second position to form a welding area of the current collecting disc, wherein the welding area is formed by regularly arranging the electrolyte wetting areas and the double-layer overlapping current collecting discs of the tabs and can be distinguished according to the shape of the tabs.
As the preferable technical scheme, rub the flat mechanism and rub flat roller assembly for many rounds, many rounds of conical rub flat roller assembly include a plurality of rub flat gyro wheels, a plurality of rub flat gyro wheels locate electric core and rub flat side in advance to use the vertical projection of electric core axis as centre of a circle equiangular distribution.
As an optimal technical scheme, when the number of the rubbing rollers is four, the rotation angle in the step S1-1 is 45 degrees, and the rotation angles in the step S1-2 and the step S1-3 are 90 degrees.
As an optimal technical scheme, when the number of the rubbing rollers is three, the rotation angle in the step S1-1 is 60 degrees, and the rotation angles in the step S1-2 and the step S1-3 are 105 degrees.
As an optimal technical scheme, the rubbing roller is a conical roller, conical peaks of a plurality of rubbing rollers face to the axis of the electric motor, and the extension lines of the axes of the rubbing rollers can be intersected at one point.
As the preferable technical scheme, the central axes of the plurality of the rubbing rollers are inclined towards the center of the battery cell.
As an optimal technical scheme, in the step S1, gathering and pre-shaping are performed for a plurality of times, and the final shaping effect can be improved through the plurality of times of gathering and pre-shaping.
As a preferable technical scheme, the feeding amount of the rotation of the rubbing mechanism in the step S1-1, the step S1-2 and the step S1-3 is the same.
The invention has the advantages that:
(1) According to the invention, the pole lugs can be gathered and pre-shaped by the reciprocating rolling of the pole lugs through the rubbing mechanism, the arrangement mode of the pole lugs is optimized under the condition of ensuring the flatness and thickness of the rubbing plane, the rubbing mechanism is used for rubbing and shaping the gathered and pre-shaped pole lugs and forming regularly arranged electrolyte infiltration areas and collector plate welding areas, the metal scraps in the rubbing process are reduced, the poor short circuit is improved, and the welding qualification rate and electrolyte infiltration rate of the collector plates are improved through the main function distinction of different areas of the pole lugs.
(2) According to the invention, through the three steps, the electrode lugs can form a flat current collecting disc welding area in which electrolyte wetting areas and electrode lugs are regularly arranged and overlapped in double layers, so that metal scraps are reduced from falling, the risk of poor short circuit of the battery core is reduced, and electrolyte can enter the orderly laminated wetting areas at a higher speed, and the electrolyte wetting rate is improved; and after the gathering area formed by gathering and shaping is flattened, the lug forms a double-layer overlapped current collecting disc welding area, a larger welding process window can be obtained, and the welding process has remarkable effect on poor welding or cold welding of the current collecting disc.
Drawings
Fig. 1 is a schematic flow chart of step S1 of a cylindrical battery full tab flattening method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cell structure of a cylindrical battery full-tab flattening method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a post-shaping structure of a cylindrical battery full tab rubbing method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a structure of a cylindrical battery after a tab is flattened according to an embodiment of the present invention;
reference numerals: 1. a rubbing mechanism; 2. a battery cell; 3. and a tab.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a method for flattening all tabs of a cylindrical battery comprises the following steps:
s1: the pole lugs 3 are rolled back and forth at a fixed angle through the rubbing mechanism 1 and are pre-rubbed and flattened to gather and pre-shape the pole lugs 3, so that the pole lugs 3 can be gathered and shaped for a plurality of times according to the actual gathering and shaping effect;
s1-1: the kneading mechanism 1 rotates clockwise from the initial position to pre-shape the electrode lugs 3 on the kneading plane of the battery core 2 and reaches a first position; the electric core kneading plane is a plane provided with a tab 3 at the top of the electric core 2
S1-2: the rubbing mechanism 1 rotates anticlockwise from the first position to the second position;
s1-3: the rubbing mechanism 1 rotates clockwise from the second position and returns to the first position;
s2: the pole lugs 3 after gathering and pre-shaping are kneaded and shaped through the kneading mechanism 1, and form electrolyte infiltration areas and current collecting disc welding areas which are regularly arranged, the kneading mechanism 1 starts rotating from a second position to stop after forming the electrolyte infiltration areas which are regularly arranged according to the pole lugs 3 and the current collecting disc welding areas which are regularly arranged according to the pole lugs 3 and can be distinguished in appearance, and the electrolyte infiltration areas which are regularly arranged and the current collecting disc welding areas which are regularly arranged are formed.
The rubbing mechanism 1 comprises a multi-wheel rubbing roller assembly, the multi-wheel conical rubbing roller assembly comprises a plurality of rubbing rollers, the rubbing rollers are arranged on the pre-rubbing side of the battery core 2 and are distributed at equal angles by taking vertical projection of the axis of the battery core 2 as circle centers, the rubbing rollers are conical rollers, conical vertexes of the rubbing rollers face the axis of the battery core 2, and extension lines of the axes of the rubbing rollers can be compared with a point of the axis of the battery core 2, wherein the rubbing rollers are obliquely arranged, in the embodiment, the rotation angles of the rubbing rollers in the S1-1 are 45 degrees, and the rotation angles of the rubbing rollers in the step S1-2 and the step S1-3 are 90 degrees.
Referring to fig. 1 to 4, the usage method specifically comprises:
step one: the kneading mechanism 1 rotates 45 degrees clockwise from the initial position to pre-shape the electrode lugs 3 from the kneading plane of the battery core 2 under a certain feeding amount, and reaches a first position;
step two: the rubbing mechanism 1 rotates 90 degrees anticlockwise from the first position to the second position under the same feeding amount;
step three: the rubbing mechanism 1 rotates 90 degrees clockwise from the second position and returns to the first position under the same feeding amount;
step two, repeating for two times to achieve the best shaping and gathering effect of the tab 3;
step four: the rubbing mechanism 1 rotates 20 circles from the second position to finally rub and shape the pole lugs 3;
step five: welding the current collecting disc of the rubbing and flattening battery cell 2, and adjusting the welding track position to the position where the electrode lugs 3 are gathered and flattened; performing a hipot (breakdown voltage) test on the battery cell 2 welded by the current collecting disc, and confirming the change conditions of the infiltration efficiency and the short circuit rate;
the test results were as follows: after the electric core is kneaded flat, the appearance of the polar ear kneading plane confirms that the polar ear kneading plane is flat, and the polar ear 3 is arranged in a clear level; the defective rate of the hipot after rubbing is 0.07%; the current collector plate weld power window may be increased appropriately without causing weld through, the current collector plate weld through being about 0.04%.
Example 2
Referring to fig. 2 to 4, the difference between the present embodiment and embodiment 1 is that the number of the rubbing rollers is different, three are taken as an example in embodiment 2, and the rotation angle can be properly adjusted according to the number of rollers in order to obtain the best pole ear 2 gathering and shaping effect, the rotation angle in step S1-1 is 60 °, and the rotation angle in step S1-2 and step S1-3 is 105 °.
The using method specifically comprises the following steps:
step one: the rubbing mechanism 1 rotates clockwise by 60 degrees from the initial position of the rubbing plane of the battery core 2 under a certain feeding amount, pre-shapes the electrode lugs 3 and reaches a first position;
step two: the rubbing mechanism 1 rotates by 105 degrees anticlockwise from the first position to the second position under the same feeding amount;
step three: the rubbing mechanism 1 rotates by 105 degrees clockwise from the second position and returns to the first position under the same feeding amount;
step two, repeating for two times to achieve the best shaping and gathering effect of the tab 3;
step four: the rubbing mechanism 1 rotates 20 circles from the second position to finally rub and shape the pole lugs 3;
step five: welding the current collecting disc of the rubbing and flattening battery cell 2, and adjusting the welding track position to the position where the electrode lugs 3 are gathered and flattened; and performing a hipot (breakdown voltage) test on the battery core 2 after welding the current collecting disc, and confirming the change conditions of the wetting efficiency and the short circuit rate.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The full lug rubbing and flattening method for the cylindrical battery is characterized by comprising the following steps of:
s1: the pole lugs are rolled in a reciprocating way through a rubbing mechanism and are pre-rubbed and flattened, so that the pole lugs are gathered and pre-shaped;
s2: and rubbing and shaping the pole lugs after gathering and pre-shaping through a rubbing and shaping mechanism, and forming regularly arranged electrolyte infiltration areas and current collecting disc welding areas.
2. The method for rolling and flattening all tabs of a cylindrical battery according to claim 1, wherein the reciprocating rolling in the step S1 comprises the steps of:
s1-1: the kneading mechanism rotates clockwise from the initial position to pre-shape the tab in the electric core kneading plane and reaches the first position;
s1-2: the rubbing mechanism rotates anticlockwise from the first position to the second position;
s1-3: the rubbing mechanism rotates clockwise from the second position and returns to the first position.
3. The method for rolling and flattening all tabs of a cylindrical battery according to claim 2, wherein in the step S2, the rolling and flattening mechanism starts rotating from the second position to form electrolyte soaking areas regularly arranged according to tab morphology and a double-layer overlapping current collecting disc welding area of the tabs, and then stops.
4. The method for rolling all tabs of a cylindrical battery according to claim 1, wherein the rolling mechanism is a multi-wheel rolling roller assembly, the multi-wheel conical rolling roller assembly comprises a plurality of rolling rollers, and the rolling rollers are arranged on the pre-rolling side of the battery core and are distributed at equal angles with the vertical projection of the axis of the battery core as the center of a circle.
5. The method for rolling and flattening all tabs of a cylindrical battery according to claim 4, wherein when the number of the rolling and flattening rollers is four, the rotation angle in the step S1-1 is 45 °, and the rotation angles in the step S1-2 and the step S1-3 are 90 °.
6. The method for rolling and flattening all tabs of a cylindrical battery according to claim 4, wherein when the number of rolling and flattening rollers is three, the rotation angle in the step S1-1 is 60 °, and the rotation angles in the step S1-2 and the step S1-3 are 105 °.
7. The method of claim 4, wherein the rolling roller is a conical roller, conical peaks of the rolling rollers face the axis of the battery shaft, and extension lines of the axes of the rolling rollers are intersected with each other.
8. The method for rolling all tabs of a cylindrical battery according to claim 7, wherein the central axes of the rolling rollers are inclined toward the center of the battery cell.
9. The method for rolling and flattening all tabs of a cylindrical battery according to claim 1, wherein the step S1 is performed a plurality of times.
10. The method for rolling and flattening all tabs of a cylindrical battery according to claim 2, wherein the feeding amounts of the rolling and flattening mechanisms in the steps S1-1, S1-2 and S1-3 are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310247672.1A CN116315479A (en) | 2023-03-10 | 2023-03-10 | Method for rubbing and flattening all lugs of cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310247672.1A CN116315479A (en) | 2023-03-10 | 2023-03-10 | Method for rubbing and flattening all lugs of cylindrical battery |
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| Publication Number | Publication Date |
|---|---|
| CN116315479A true CN116315479A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310247672.1A Pending CN116315479A (en) | 2023-03-10 | 2023-03-10 | Method for rubbing and flattening all lugs of cylindrical battery |
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| Country | Link |
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| CN (1) | CN116315479A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995309A (en) * | 2023-08-01 | 2023-11-03 | 深圳市中基自动化股份有限公司 | Rub flat all-in-one of rubbing in advance |
| CN117810555A (en) * | 2024-03-01 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Tab flattening device, tab flattening control method and battery production system |
-
2023
- 2023-03-10 CN CN202310247672.1A patent/CN116315479A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995309A (en) * | 2023-08-01 | 2023-11-03 | 深圳市中基自动化股份有限公司 | Rub flat all-in-one of rubbing in advance |
| CN117810555A (en) * | 2024-03-01 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Tab flattening device, tab flattening control method and battery production system |
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