CN114678665B - Welding method and welding fixture for battery cell - Google Patents
Welding method and welding fixture for battery cell Download PDFInfo
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- CN114678665B CN114678665B CN202210273318.1A CN202210273318A CN114678665B CN 114678665 B CN114678665 B CN 114678665B CN 202210273318 A CN202210273318 A CN 202210273318A CN 114678665 B CN114678665 B CN 114678665B
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- 238000003466 welding Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000000758 substrate Substances 0.000 claims description 29
- 238000004804 winding Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 9
- 239000011888 foil Substances 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 5
- 239000013543 active substance Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 14
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 229910000679 solder Inorganic materials 0.000 description 19
- 238000010586 diagram Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 6
- 241000405070 Percophidae Species 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/545—Terminals formed by the casing of the cells
-
- 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
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a welding method and a welding fixture for an electric core, comprising the following steps: welding the electrode lugs of the battery cells and the switching pieces together to form a dry battery cell; placing the top cover on a first clamp; placing the dry battery cell on a second clamp, so that the battery cell is obliquely arranged in a direction close to the top cover; welding the rotating sheet and the top cover together. According to the welding method and the welding fixture for the battery cell, in the process of welding the dry battery cell to the top cover, the battery cell is obliquely arranged, so that the distance between the edge of the battery cell and the top cover can be reduced, the length of the tab can be designed to be smaller, the anomalies such as tab falling, tab wrinkling and tab tearing caused by the overlong tab can be reduced, the redundancy on the outer side of the tab is reduced, the risk of short circuit caused by tab insertion is reduced, and the safety of the battery cell is improved.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a welding method and a welding fixture for an electric core.
Background
At present, lithium ion batteries have important roles in mobile phones, flat plates, household appliances, transportation means and the like in our lives. Among them, whether the safety of lithium ion batteries is reliable has been a topic of interest.
In the related art, when the top cover is welded, the top cover is basically placed on the horizontal clamp, the battery core is horizontally placed on the top cover, and the switching piece and the top cover are welded together. However, the process is limited by the influence of the width of the top cover and the welding and printing distance, so that the length of the electrode lug is too long, the electrode lug of the battery core is too long, the electrode lug is folded, the electrode lug is torn, the electrode lug is folded abnormally, burrs can be generated when the electrode lug is torn to cause short circuit, the electrode lug is folded and rolled into the winding core, positive and negative electrode contact can also cause short circuit risk, the electrode lug is folded, the electrode lug is impacted, and the like.
Therefore, there is a need to design a new welding method and welding fixture for the battery cell to overcome the above problems.
Disclosure of Invention
The embodiment of the invention provides a welding method and a welding fixture for a battery cell, which are used for solving the problem that the length of a tab is too long due to the influence of the width of a top cover and the welding interval in the related technology.
In a first aspect, a method for welding a battery cell is provided, including the steps of: welding the electrode lugs of the battery cells and the switching pieces together to form a dry battery cell; placing the top cover on a first clamp; placing the dry battery cell on a second clamp, so that the battery cell is obliquely arranged in a direction close to the top cover; welding the rotating sheet and the top cover together.
In some embodiments, before the electrode tab of the cell and the adapter tab are welded together to form the dry cell, the method further includes: determining a first distance h 1 between the edge of the battery cell, which is close to the electrode lug, and the welding mark of the electrode lug; and adjusting the distance between the edge of the battery cell and the switching piece according to the first distance h 1.
In some embodiments, the determining the first distance h 1 between the edge of the battery cell near the tab and the solder printing of the tab includes: acquiring the thickness d of the battery cell, the width m of the welding marks on the electrode lugs, and the distance x between the welding marks of the two electrode lugs on the same switching lug when the battery cell and the switching lug are horizontally placed for welding fixation; and calculating the first distance h 1 according to the distance x, the thickness d of the battery cell and the width m of the welding marks on the electrode lugs.
In some embodiments, before the electrode tabs of the battery cells and the adapter pieces are welded together to form the dry battery cells, the method further includes: determining a first width W 1 of a pole piece substrate in a pole piece of the battery cell; and manufacturing the battery cell by using the pole piece with the first width W 1 of the pole piece substrate.
In some embodiments, the determining the first width W 1 of the pole piece substrate in the pole piece of the electrical core includes: when the battery cell and the switching sheet are horizontally placed and welded and fixed, the distance x between the welding marks of two lugs on the same switching sheet, the second width W 2 of the pole piece substrate of the battery cell and the second distance h 2 between the edge of the battery cell and the welding marks of the corresponding lugs are obtained; and calculating the first width W 1 according to the distance x, the thickness d of the battery core, the width m of the welding marks on the tab, the second width W 2 and the second distance h 2.
In some embodiments, the manufacturing the battery cell using the pole piece of the first width W 1 of the pole piece substrate includes: rolling the pole piece and the diaphragm into a roll core on a rolling device, wherein the width of a pole piece substrate of the pole piece is the first width W 1; and combining the winding cores together to form the battery cell.
In some embodiments, before the pole piece and the diaphragm are rolled into the winding core on the winding device, the method further comprises: coating active substances on the foil to form the pole piece, wherein the pole piece substrate of the pole piece is the first width W 1; and cutting the pole piece base material of the pole piece to form a pole lug.
In some embodiments, the inclination angle θ between the battery cell and the top cover is an acute angle, and the value range of the inclination angle θ is calculated according to the width L of the top cover, the distance f between the tops of two battery cells on two opposite sides of the top cover when the battery cells are placed in an inclined manner, and the thickness d of the battery cell.
In a second aspect, a welding fixture is provided, and the welding method for the battery cell includes: the first clamp is used for placing the top cover; and a second clamp for placing the dry battery cell, wherein an inclination angle theta is formed between the surface of the second clamp and the surface of the first clamp.
In some embodiments, the inclination angle θ is an acute angle, and the range of the inclination angle θ is calculated according to the width L of the top cover, the distance f between the tops of two cells on two opposite sides of the top cover when the cells are placed in an inclined manner, and the thickness d of the cell.
The technical scheme provided by the invention has the beneficial effects that:
The embodiment of the invention provides a welding method and a welding fixture for a battery cell, wherein the battery cell is obliquely arranged in the process of welding a dry battery cell to a top cover, so that the distance between the edge of the battery cell and the top cover can be reduced, the length of a tab can be designed to be smaller, the anomalies such as tab falling couch, tab wrinkling, tab tearing and the like caused by the overlong tab are reduced, the redundancy on the outer side of the tab is reduced, the risk of short circuit caused by tab insertion is reduced, and the safety of the battery cell is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional pole piece;
FIG. 2 is a schematic diagram of a conventional dry cell and interposer wafer soldering structure;
fig. 3 is a schematic structural diagram of a conventional dry cell welded with a top cover horizontally;
fig. 4 is a schematic structural diagram of a pole piece according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of welding a dry cell and a transfer chip according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a dry cell according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of the inclined welding of the dry cell and the top cover according to the embodiment of the present invention;
fig. 9 is a schematic structural diagram of a dry cell core-closing state after oblique welding according to an embodiment of the present invention.
In the figure:
1. A battery cell; 10. edges; 11. a tab; 12. welding and printing; 13. a pole piece substrate; 14. a pole piece;
2. A transfer sheet; 3. a top cover; 4. a first clamp; 5. a second clamp; 6. and (3) adhesive tape.
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 of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in 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 of the present invention. 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.
The embodiment of the invention provides a welding method and a welding fixture for a battery cell, which can solve the problem that the length of a tab is too long due to the influence of the width of a top cover and the welding interval in the related technology.
Referring to fig. 4 to 8, a method for welding a battery cell according to an embodiment of the present invention may include the following steps:
Step 1: and welding the tab 11 of the battery cell 1 and the adapter piece 2 together to form a dry battery cell. Wherein, in the welding process of the tab 11 and the switching piece 2, ultrasonic welding can be adopted; each cell 1 can be provided with a positive electrode lug 11 and a negative electrode lug 11, and one cell 1 is arranged on two opposite sides of each switching sheet 2, so that two electrode lugs 11 are welded on each switching sheet 2, and each dry cell at least comprises two cells 1.
Step 2: the top cover 3 is placed on the first clamp 4. Wherein the first clamp 4 is preferably arranged horizontally.
Step 3: the dry battery cell is placed on the second fixture 5, so that the battery cell 1 is obliquely arranged in a direction approaching the top cover 3. That is, the dry battery cells after ultrasonic welding are transferred to the second clamp 5 of the welding procedure of the switching sheet 2, the surface of the second clamp 5 can be obliquely arranged, the inclined included angle of the second clamp is adjustable, the second clamp 5 is arranged on two opposite sides of the first clamp 4, so that the two battery cells 1 of the dry battery cells can be respectively placed on the second clamp 5 on two sides of the first clamp 4, and each battery cell 1 is obliquely arranged relative to the top cover 3.
Step 4: the adapter piece 2 and the top cover 3 are welded together. Laser welding is preferred in this embodiment.
Wherein, step 1 can be interchanged with step 2, and step 2 can also be interchanged with step 3.
In this embodiment, because in the process of welding the dry battery cell to the top cover 3, the battery cell 1 is obliquely arranged, the distance between the edge 10 of the battery cell 1 and the top cover 3 can be reduced, so that the length of the tab 11 can be designed to be smaller, the width of a base material is reduced, the anomalies such as the tab 11 falling down, the tab 11 wrinkling, the tab 11 tearing and the like caused by the overlong tab 11 are reduced, the redundancy of the outer side of the tab 11 is reduced, the risk of short circuit caused by the insertion of the tab 11 is reduced, and the safety of the battery cell 1 is improved.
Referring to fig. 6, in some embodiments, before the step 1, before the tab 11 of the cell 1 and the interposer web 2 are welded together to form a dry cell, the method may further include: determining a first distance h 1 between the edge 10 of the battery cell 1, which is close to the tab 11, and the solder marks 12 of the tab 11; and adjusting the distance between the edge 10 of the battery cell 1, which is close to the tab 11, and the adapter piece 2 according to the first distance h 1. That is, before welding the tab 11, a first distance h 1 required between the welding mark 12 and the edge 10 of the battery cell 1 after welding the tab 11 can be calculated in advance, then the distance between the edge 10 of the battery cell 1, which is close to the tab 11, and the adapter plate 2 is adjusted to the required first distance h 1 before welding, so that the length of the tab 11 is reduced as much as possible under the condition that the welding and using requirements are met, and the adapter plate 2 is placed in a fixture in an ultrasonic welding process, the distance between the edge 10 of the battery cell 1, which is close to the tab 11, and the adapter plate 2 can be adjusted by adjusting the fixture of ultrasonic welding, and the fixture of ultrasonic welding can be adjusted in width according to the requirements; the first distance h 1 can be calculated by the distance between the outer edges of the two solder marks 12 and the thickness d of the cell 1.
Further, referring to fig. 1 to 3, the determining the first distance h 1 between the edge 10 of the battery cell 1 near the tab 11 and the solder 12 of the tab 11 may include: acquiring the thickness d of the battery cell 1, the width m of the welding marks 12 on the electrode lugs 11 and the distance x between the welding marks 12 of the two electrode lugs 11 on the same rotating sheet 2 when the battery cell 1 and the rotating sheet 2 are horizontally placed and welded and fixed; and calculating the first distance h 1 according to the distance x, the thickness d of the battery cell 1 and the width m of the solder 12 on the tab 11. That is, the value of the first distance h 1 can be calculated according to the related parameters when the conventionally designed battery cell 1 and the switch sheet 2 are horizontally placed, the conventionally designed battery cell 1 is horizontally placed, the top cover 3 is also horizontally placed, and the switch sheet 2 of the dry battery cell is welded and fixed with the top cover 3, in this conventionally designed scheme, the distance between the solder marks 12 of two opposite tabs 11 on the same switch sheet 2 is x, the width of the top cover 3 is L, the thickness of the battery cell 1 is d, and the width of the solder marks 12 is m, where the width L of the top cover 3, the thickness d of the battery cell 1, and the width m of the solder marks 12 in the conventionally designed scheme can be equal to the width L of the top cover 3, the thickness d of the battery cell 1, and the width m of the solder marks 12 in the obliquely arranged scheme of the application. After the distance x, the thickness d of the cell 1, and the width m of the solder 12 are obtained, the value of the first distance h 1 can be calculated by the formula h 1 = (x+2m-2 d)/2, where d=2t, t is half the thickness of a single winding core. Wherein the width of the adapter piece 2 is y; of course, the value of the first distance h 1 can also be calculated by the formula h 1＝(k2-2h2 -2 d)/2, and since k 2-2h2 =x+2m, the value of (k 2-2h2) can also be calculated when the pitch x and the width m of the solder mark 12 are known.
Referring to fig. 4, in some alternative embodiments, before step 1, before the tab 11 of the battery cell 1 is welded with the interposer web 2 to form a dry battery cell, the method may further include: determining a first width W 1 of a pole piece substrate 13 in a pole piece 14 of the battery cell 1; and manufacturing the battery cell 1 by using the pole piece 14 with the first width W 1 of the pole piece substrate 13. That is, before the battery cell 1 is processed and manufactured, the width of the required pole piece substrate 13 is calculated in advance, so that the length of the tab 11 manufactured by the pole piece substrate 13 is ensured not to be too long. Before the battery cell 1 is manufactured, materials such as a top cover 3, a switching piece 2, a foil, and a diaphragm, which are required for design, may be prepared.
Further, referring to fig. 1,2 and 6, the determining the first width W 1 of the pole piece substrate 13 in the pole piece 14 of the electrical core 1 may include: when the battery cell 1 and the switching sheet 2 are horizontally placed and welded and fixed, the distance x between the welding marks 12 of the two electrode lugs 11 on the same switching sheet 2, the second width W 2 of the electrode sheet substrate 13 of the battery cell 1 and the second distance h 2 between the edge 10 of the battery cell 1 and the welding marks 12 of the corresponding electrode lug 11 are obtained; that is, the second width W 2 and the second distance h 2 are parameters corresponding to the cells 1 in the horizontal state; according to the distance x, the thickness d of the battery cell 1, the width m of the solder marks 12 on the tab 11, the second width W 2, and the second distance h 2, the first width W 1 may be calculated by first calculating the first distance h 1 between the edge 10 of the battery cell 1 and the solder marks 12 of the tab 11 when the battery cell 1 is obliquely arranged, where the first distance h 1 may be calculated by the above method, and is not described herein, and then calculating the first width W 1 by using the formula W 1＝W2-(h2-h1), where h 2 is the distance between the edge 10 of the battery cell 1 and the solder marks 12 of the tab 11 when the battery cell 1 is horizontally arranged in the conventional scheme, that is, the second distance h 2.
Further, a first distance h 1 between the edge 10 of the inclined welding cell 1 and the welding mark 12 and a second distance h 2 between the edge 10 of the cell 1 and the welding mark 12 between traditional welding are 0 < h 1＜h2, and a first width W 1＝W2-(h2-h1)＝W2 -n of the pole piece substrate 13.
Further, referring to fig. 6 and 7, the manufacturing the battery cell 1 by using the pole piece 14 with the first width W 1 of the pole piece substrate 13 may include: winding the pole piece 14 and the diaphragm into a winding core on winding equipment, wherein the width of a pole piece substrate 13 of the pole piece 14 is the first width W 1; the winding cores are combined together to form the battery cell 1, and then the battery cell 1 is bound by the adhesive tape 6 and then flows to an ultrasonic welding process. At this time, the formed cell 1, that is, the specification and the size of the cell 1 required in the subsequent oblique welding of the present application, is manufactured according to the pre-calculated width of the electrode sheet base material 13.
On the basis of the above technical solution, as shown in fig. 4 and 5, before the pole piece 14 and the diaphragm are wound into a winding core on the winding device, the method may further include: coating active substances on the foil to form the pole piece 14, wherein the pole piece substrate 13 of the pole piece 14 is the first width W 1; the pole piece base material 13 of the pole piece 14 is cut to form the pole lug 11, so that the length of the pole lug 11 is the first width W 1, and the length of the pole lug 11 formed after cutting is reduced compared with that of the traditional pole lug 11.
In some embodiments, referring to fig. 8, the inclination angle θ between the battery cell 1 and the top cover 3 is an acute angle, and the value range of the inclination angle θ is calculated according to the width L of the top cover 3, the distance f between the tops of two battery cells 1 on two opposite sides of the top cover 3 when the battery cell 1 is placed obliquely, and the thickness d of the battery cell 1. In the embodiment, the value range of the inclination angle theta is 0 degrees less than theta (90-arccos [ (L-f)/4 d ] }, and the optimal value of theta is 18 degrees, so that the problem that the laser equipment emits light and cannot be welded due to the fact that the inclination angle theta is too large is avoided, and the core combination problem can be avoided. The minimum value of f is just the width of the welding duckbill device of the transfer sheet 2, and the duckbill device on the laser equipment is pressed down to the transfer sheet when the transfer sheet 2 is welded, so that the transfer sheet is ensured to be attached to the top cover 3 more closely, the welding effect is not influenced by the attachment, the minimum value of f is set to be just the width of the welding duckbill device of the transfer sheet 2 in the embodiment, and the duckbill device can be prevented from being pressed onto the winding core when being pressed down, so that scrapping is caused.
Further, referring to fig. 9, after the dry cell is welded to the top cover 3 in step 4, the dry cell may be core-bound into a case to complete the oblique welding process. The difference in distance n=h 2-h1 > 0 between the edge 10 of the cell 1 and the solder 12 after the oblique welding, where n is also the width of the foil that can be reduced by the oblique welding, i.e. the oblique welding according to the application can reduce the width of the pole piece substrate 13. And the relation between the internal space k 1 of the battery cell 1, the internal space k 2 of the battery cell 1 and the width L of the top cover 3 which are welded in a tilting way by adopting the application is k 1＜L＜k2, and the internal space of the battery cell 1 is effectively reduced by adopting the application.
A specific embodiment of the present application is given below:
For example, when the conventional cell 1 is horizontally arranged, the distance x=43 mm between the solder marks 12, the width m=6 mm of the solder marks 12, and the thickness d=17.8 mm of the cell 1 are adopted, then the first distance h 1 = (43+2×6-2×17.8)/2=9.7 mm from the edge 10 of the obliquely welded ultrasonic-welded cell 1 to the solder marks 12 of the tab 11; according to the second distance h 2 =14.7 mm between the edge 10 of the conventional ultrasonic-welded cell 1 and the solder mark 12 of the tab 11, the second width W 2 =31.5 mm of the pole piece base material 13, the first width W 1 =31.5- (14.7-9.7) =26.5 mm of the obliquely-welded pole piece base material 13, and the width reduction n=w 2-W1 =5.0 mm of the pole piece base material 13 can be obtained. The inclined welding pole piece 14 is wound into a battery core 1 through related procedures, the battery core 1 is bound to an ultrasonic welding procedure through an adhesive tape 6 during pairing, the first distance h 1 from the edge 10 of the battery core 1 to a welding mark 12 in the ultrasonic welding procedure is adjusted to be 9.7mm, and the tab 11 of the battery core 1 and the switching piece 2 are welded together through ultrasonic waves; the dry battery cell after ultrasonic welding is transferred to the second clamp 5 with the welding inclination angle theta=18 DEG of the switching piece 2, the switching piece 2 and the top cover 3 arranged on the first clamp 4 are welded together by adopting laser, the adhesive tape 6 is used for bundling the battery cell 1 after the battery cell 1 is combined, the redundancy of the outer electrode lug 11 of the battery cell 1 after the battery cell 1 is bundled in the diagram 9 can be reduced, the risk of inserting the electrode lug 11 into the battery cell 1 after the redundancy is reduced can be reduced, meanwhile, the reduction of the electrode lug 11 can be reduced, and the abnormal edge collapse, tearing and folding of the electrode lug 11 caused in the manufacturing process can be reduced.
Further, according to the schematic diagrams 6, 7 and 8, the internal space k 1 =9.7×2+43+2×6=74.4 mm of the cell 1 at this time, the internal space k 2 of the cell 1 of the conventional design is 84.4mm, and the width of the top cover 3 is 77.8mm. Under the condition of ensuring design requirements, the inclined welding process is adopted to optimize the length of the tab 11 and the redundancy of the tab 11, if the traditional horizontal placement welding process is adopted, the corresponding distance is limited by the width of the top cover 3 under the condition of reducing the corresponding distance, and the corresponding optimal design cannot be achieved.
The width of the pole piece substrate 13 used by the traditional horizontally welded battery cell 1 is 31.5mm, the distance h 2 = 14.7mm from the edge 10 of the battery cell 1 to the welding mark 12 of the pole lug 11, the battery cell 1 welded by the adapter piece 2 adopts the welding process of horizontally placing the winding core in the diagram 3, after the welding is finished, redundancy of the pole lug 11 on the outer side of the bundling core battery cell 1 in the diagram 9 is not reduced, compared with the pole lug 11 in the embodiment of the application, the redundancy of the traditional pole lug 11 is more than 5.0mm, the redundant pole lug 11 has the risk of being inserted into the battery cell 1, meanwhile, the substrate width is 5.0mm wider than the pole lug 11 in the embodiment of the application, the length of the corresponding pole lug 11 is 5.0mm longer, and the increase of the length of the pole lug 11 also increases rejection in the manufacturing process.
In summary, compared with the traditional method of horizontally placing and welding the battery cell 1, the inclined welding method provided by the embodiment of the invention is not limited by the width of the top cover 3, can freely adjust the distance between the diaphragm of the ultrasonic welding battery cell 1 and the welding mark 12, improves the flexibility of ultrasonic welding, and can adjust the parameters of ultrasonic welding according to actual requirements; under the condition of meeting the design requirement, the width of the base material and the use amount of the foil can be reduced, the cost can be saved, and the quality energy density of the battery cell 1 is improved; on the basis of shortening the width of the pole piece substrate 13, the defects that in the manufacturing process, the electrode lugs 11 are wrinkled, the electrode lugs 11 collapse, micro short circuits are caused by tearing burrs of the electrode lugs 11, and short circuit is abnormal caused by folding the electrode lugs 11 due to the fact that the width of the substrate is too wide can be reduced, and the safety of the battery cell 1 is improved and the manufacturing cost is saved.
The embodiment of the invention also provides a welding fixture for the welding method of the battery cell, wherein the welding fixture can comprise a first fixture 4 and a second fixture 5, the first fixture 4 is used for placing the top cover 3, and the surface of the first fixture 4 can be in a horizontal state; the second fixture 5 is used for placing dry cells, wherein the second fixture 5 is distributed on two opposite sides of the first fixture 4 and is used for placing at least two cells 1 of the dry cells, and the surface of the second fixture 5 may be an inclined surface, so that an inclination angle θ is formed between the surface of the second fixture 5 and the surface of the first fixture 4. Through setting up inclined second anchor clamps 5 for after electric core 1 is placed on second anchor clamps 5, electric core 1 sets up for top cap 3 slope, and then helps reducing the length of utmost point ear 11.
Further, the inclination angle θ is an acute angle, and the value range of the inclination angle θ is calculated d according to the width L of the top cover 3, the distance f between the tops of the two electric cores 1 on two opposite sides of the top cover 3 when the electric cores 1 are obliquely placed, and the thickness of the electric core 1. In the embodiment, the value range of the inclination angle theta is 0 degrees less than theta (90-arccos [ (L-f)/4 d ] }, and the optimal value of theta is 18 degrees, so that the problem that the laser equipment emits light and cannot be welded due to the fact that the inclination angle theta is too large is avoided, and the core combination problem can be avoided.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present invention, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The welding method of the battery cell is characterized by comprising the following steps of:
welding the electrode lugs (11) of the battery cells (1) and the adapter plates (2) together to form dry battery cells, wherein each dry battery cell at least comprises two battery cells (1);
placing the top cover (3) on the first clamp (4);
Placing the dry battery cells on a second clamp (5) so that the battery cells (1) in the dry battery cells are respectively placed on the second clamp (5) at two sides of the first clamp (4), and each battery cell (1) is obliquely arranged in a direction close to the top cover (3);
and welding the adapter piece (2) and the top cover (3) together.
2. The method for welding the battery cells according to claim 1, wherein before the tab (11) of the battery cell (1) and the adapter piece (2) are welded together to form the dry battery cell, the method further comprises:
Determining a first distance h1 between an edge (10) of the battery cell (1) close to the tab (11) and a welding mark (12) of the tab (11);
And adjusting the distance between the edge (10) of the battery cell (1) and the switching piece (2) according to the first distance h 1.
3. The method of soldering a cell as recited in claim 2, wherein: the determining of the first distance h1 between the edge (10) of the battery cell (1) close to the tab (11) and the welding mark (12) of the tab (11) comprises:
acquiring the thickness d of the battery cell (1), the width m of the welding marks (12) on the electrode lugs (11) and the interval x between the welding marks (12) of the two electrode lugs (11) on the same adapter piece (2) when the battery cell (1) and the adapter piece (2) are horizontally placed for welding fixation;
And calculating the first distance h1 according to the distance x, the thickness d of the battery cell (1) and the width m of the welding marks (12) on the electrode lug (11).
4. The method for welding the battery cell according to claim 1, wherein before welding the tab (11) of the battery cell (1) and the adapter piece (2) together to form the dry battery cell, the method further comprises:
determining a first width W1 of a pole piece substrate (13) in a pole piece (14) of the battery cell (1);
And manufacturing the battery cell (1) by using the pole piece (14) with the first width W1 of the pole piece substrate (13).
5. The method of welding a battery cell according to claim 4, wherein said determining a first width W1 of a pole piece substrate (13) in a pole piece (14) of said battery cell (1) comprises:
Acquiring a distance x between welding marks (12) of two lugs (11) on the same transfer sheet (2), a second width W2 of a pole piece substrate (13) of the battery cell (1) and a second distance h2 between an edge (10) of the battery cell (1) and the welding marks (12) of the corresponding lug (11) when the battery cell (1) and the transfer sheet (2) are horizontally placed and fixed;
and calculating the first width W1 according to the distance x, the thickness d of the battery cell (1), the width m of the welding mark (12) on the tab (11), the second width W2 and the second distance h 2.
6. The method of welding a battery cell according to claim 4, wherein the manufacturing the battery cell (1) using the pole piece (14) of the first width W1 of the pole piece base material (13) includes:
winding a pole piece (14) and a diaphragm into a winding core on winding equipment, wherein the width of a pole piece substrate (13) of the pole piece (14) is the first width W1;
the winding cores are combined together to form the battery cell (1).
7. The method of welding a battery cell according to claim 6, further comprising, prior to said winding the pole piece (14) and the diaphragm into a winding core on a winding device:
coating active substances on the foil to form the pole piece (14), wherein a pole piece substrate (13) of the pole piece (14) is the first width W1;
And cutting the pole piece base material (13) of the pole piece (14) to form the pole lug (11).
8. The method of soldering a cell as recited in claim 1, wherein:
the inclination angle theta between the battery cells (1) and the top cover (3) is an acute angle, and the value range of the inclination angle theta is calculated according to the width L of the top cover (3), the distance f between the tops of two battery cells (1) on two opposite sides of the top cover (3) when the battery cells (1) are obliquely placed, and the thickness d of the battery cells (1).
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| CN202210273318.1A CN114678665B (en) | 2022-03-18 | 2022-03-18 | Welding method and welding fixture for battery cell |
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| CN202210273318.1A CN114678665B (en) | 2022-03-18 | 2022-03-18 | Welding method and welding fixture for battery cell |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421188A (en) * | 2020-10-30 | 2021-02-26 | 蜂巢能源科技有限公司 | Welding method of tab and cover plate, battery module, battery pack and vehicle |
| CN112792448A (en) * | 2021-01-13 | 2021-05-14 | 瑞浦能源有限公司 | Method for improving welding reliability of power battery tab |
| CN112792490A (en) * | 2021-01-29 | 2021-05-14 | 湖北亿纬动力有限公司 | Tab welding method and tab welding device |
| CN216054878U (en) * | 2021-09-28 | 2022-03-15 | 北京小米移动软件有限公司 | Battery pack and terminal device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421188A (en) * | 2020-10-30 | 2021-02-26 | 蜂巢能源科技有限公司 | Welding method of tab and cover plate, battery module, battery pack and vehicle |
| CN112792448A (en) * | 2021-01-13 | 2021-05-14 | 瑞浦能源有限公司 | Method for improving welding reliability of power battery tab |
| CN112792490A (en) * | 2021-01-29 | 2021-05-14 | 湖北亿纬动力有限公司 | Tab welding method and tab welding device |
| CN216054878U (en) * | 2021-09-28 | 2022-03-15 | 北京小米移动软件有限公司 | Battery pack and terminal device |
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