CN114678665A - Welding method and welding fixture for battery cell - Google Patents
Welding method and welding fixture for battery cell Download PDFInfo
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- CN114678665A CN114678665A CN202210273318.1A CN202210273318A CN114678665A CN 114678665 A CN114678665 A CN 114678665A CN 202210273318 A CN202210273318 A CN 202210273318A CN 114678665 A CN114678665 A CN 114678665A
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- 238000003466 welding Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 claims description 24
- 238000004804 winding Methods 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 16
- 230000001154 acute effect Effects 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 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
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 230000005856 abnormality Effects 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000009965 tatting Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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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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- 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 of a battery cell, which comprise the following steps: welding the electrode lug of the battery cell and the adapter sheet together to form a dry battery cell; placing a top cover on a first clamp; placing the dry battery cell on a second clamp, so that the battery cell is obliquely arranged towards the direction close to the top cover; and welding the adapter plate and the top cover together. According to the welding method and the welding fixture for the battery cell, the battery cell is obliquely arranged in the process of welding the dry battery cell to the top cover, 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 abnormalities of tab underswing, tab wrinkling, tab tearing and the like caused by overlong tab can be reduced, the redundancy quantity of 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 clamp for a battery core.
Background
At present, lithium ion batteries play a significant role in mobile phones, flat panels, household appliances, transportation tools and the like in our lives. Among them, whether the safety of the lithium ion battery is reliable has been a concern.
In the related technology, when the top cover of the battery cell is welded, the top cover is basically placed on the horizontal fixture, then the battery cell is horizontally placed on the top cover, and the adapter sheet and the top cover are welded together. However, this in-process is subject to the width of top cap and the influence of welding seal interval for the length overlength of utmost point ear, battery core utmost point ear overlength will appear tatting under the utmost point ear, utmost point ear crumple, utmost point ear tear, utmost point ear fold the anomaly, utmost point ear tear probably produce the burr cause the short circuit, utmost point ear fold be drawn into the contact of core positive negative pole and also can cause short circuit risk, utmost point ear tatting can strike utmost point ear under can impact utmost point ear etc..
Therefore, it is necessary to design a new welding method and welding fixture for battery cells to overcome the above problems.
Disclosure of Invention
The embodiment of the invention provides a welding method and a welding clamp for a battery cell, and aims to 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 print space in the related technology.
In a first aspect, a welding method for a battery cell is provided, which includes the following steps: welding the electrode lug of the battery cell and the adapter sheet together to form a dry battery cell; placing a top cover on a first clamp; placing the dry battery cell on a second fixture, so that the battery cell is obliquely arranged towards the direction close to the top cover; and welding the adapter plate and the top cover together.
In some embodiments, before the step of welding the tab of the cell and the adaptor sheet together to form the dry cell, the method further includes: determining a first distance h between the edge of the battery cell close to the tab and the welding mark of the tab1(ii) a According to the first distance h1And adjusting the distance between the edge of the battery cell and the adapter plate.
In some embodiments, the determining of the first distance h between the edge of the battery cell close to the tab and the welding print of the tab1The method comprises the following steps: acquiring the thickness d of the battery cell, the width m of welding marks on the lugs and the distance x between the welding marks of the two lugs on the same adapter plate when the battery cell and the adapter plate are horizontally placed for welding and fixing; calculating the first distance h according to the distance x, the thickness d of the battery cell and the width m of the welding mark on the lug1。
In some embodiments, before the step of welding the tab of the cell and the interposer together to form the dry cell, the method further includes: determining a first width W of a pole piece substrate in a pole piece of the cell1(ii) a Utilizing a first width W of the pole piece substrate1The battery cell is manufactured by the pole piece.
In some embodiments, the determining the first width W of the pole piece substrate in the pole pieces of the cell 1The method comprises the following steps: when the battery cell and the adapter plate are horizontally placed for welding and fixing, the distance x between the welding marks of the two lugs on the same adapter plate and the second width W of the pole piece base material of the battery cell are obtained2And a second distance h between the edge of the cell and the welding mark of the corresponding tab2(ii) a According to the distance x,The thickness d of the battery cell, the width m of the welding mark on the tab and the second width W2And the second distance h2Calculating the first width W1。
In some embodiments, the first width W of the pole piece substrate is utilized1The pole piece of, preparation the electricity core includes: rolling the pole piece and the diaphragm into a roll core on a winding device, wherein the width of the pole piece base material of the pole piece is the first width W1(ii) a And combining the winding cores together to form the battery core.
In some embodiments, before said winding the pole piece and the separator into a roll core on a winding device, the method further comprises: coating active substances on the foil to form the pole piece, wherein the pole piece base material of the pole piece is the first width W1(ii) a And cutting the pole piece substrate 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 a 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 opposite sides of the top cover when the battery cell is placed in an inclined manner, and the thickness d of the battery cell.
In a second aspect, a welding fixture is provided, which is used in the welding method of the battery cell, and includes: the first clamp is used for placing a top cover; and the second clamp is used for placing the dry cell, and 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 a value range of the inclination angle θ is calculated according to the width L of the top cover, a distance f between tops of two battery cells on opposite sides of the top cover when the battery cells are placed in an inclined manner, and a thickness d of the battery cells.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a welding method and a welding clamp of 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 abnormity of tab down-lying, tab wrinkling, tab tearing and the like caused by overlong tab can be reduced, the redundancy quantity of the outer side of the tab is also 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 in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional pole piece;
fig. 2 is a schematic structural diagram of welding of a conventional dry battery cell and an adapter plate;
fig. 3 is a schematic structural view of a conventional dry cell and a top cover when they are welded 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 of a dry battery cell and an interposer according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a dry cell provided in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an oblique welding of a dry cell and a top cap according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a dry core-combined state after oblique welding according to an embodiment of the present invention.
In the figure:
1. an electric core; 10. an edge; 11. a tab; 12. welding and printing; 13. pole piece base material; 14. pole pieces;
2. A patch panel; 3. a top cover; 4. a first clamp; 5. a second clamp; 6. provided is an adhesive tape.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a welding method and a welding clamp for a battery cell, which can solve the problem that the length of a lug is too long due to the influence of the width of a top cover and the welding distance 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 lug 11 of the battery cell 1 and the adapter sheet 2 together to form a dry battery cell. Wherein, in the process of welding the tab 11 and the adapter sheet 2, ultrasonic welding can be adopted; each battery cell 1 can be provided with a positive tab and a negative tab 11, and two opposite sides of each adapter sheet 2 are respectively provided with one battery cell 1, so that two tabs 11 are welded on each adapter sheet 2, and each dry battery cell at least comprises two battery cells 1.
Step 2: the top cover 3 is placed on the first jig 4. Wherein the first clamp 4 is preferably arranged horizontally.
And step 3: the dry cell is placed on a second fixture 5, so that the cell 1 is obliquely arranged in a direction close to the top cover 3. On also being about to dry electric core after ultrasonic bonding transports the second anchor clamps 5 of the 2 welding processes of switching piece, the surface of second anchor clamps 5 can incline to set up, and its slope contained angle is adjustable, and second anchor clamps 5 set up in the relative both sides of first anchor clamps 4 for two electric cores 1 of dry electric core can be placed respectively on the second anchor clamps 5 of first anchor clamps 4 both sides, and every electric core 1 homogeneous phase sets up for the slope of top cap 3.
And 4, step 4: and welding the adapter plate 2 and the top cover 3 together. Laser welding is preferred in this embodiment.
Wherein, the positions of step 1 and step 2 can be interchanged, and the positions of step 2 and step 3 can also be interchanged.
In this embodiment, because at the in-process with dry electric core welding to top cap 3, set up electric core 1 slope, can reduce the distance between the edge 10 of electric core 1 and the top cap 3, make the length of utmost point ear 11 can design littleer, the width of substrate has not only been reduced, still help reducing utmost point ear 11 tatami that utmost point ear 11 overlength caused, utmost point ear 11 is crumpled, utmost point ear 11 tears etc. unusually, the redundant volume in utmost point ear 11 outside has also been reduced, the risk that utmost point ear 11 inserted and causes the short circuit has been reduced, improve electric core 1's security.
Referring to fig. 6, in some embodiments, before step 1, before welding the tab 11 of the battery cell 1 and the interposer 2 together to form a dry battery cell, the method may further include: determining a first distance h between an edge 10 of the battery cell 1 close to the tab 11 and a weld mark 12 of the tab 111(ii) a According to the first distance h1And adjusting the distance between the edge 10 of the battery cell 1 close to the tab 11 and the adapter sheet 2. That is, before welding the tab 11, the first distance h required between the weld mark 12 and the edge 10 of the battery cell 1 after welding the tab 11 may be calculated in advance1Then, before welding, the distance between the edge 10 of the battery core 1 close to the tab 11 and the adapter sheet 2 is adjusted to a required first distance h1Welding is carried out again, and the length of the tab 11 is guaranteed to be reduced as much as possible under the condition that welding and using requirements are met, wherein the adapter sheet 2 is placed in the clamp in the ultrasonic welding process, the distance between the edge 10, close to the tab 11, of the battery core 1 and the adapter sheet 2 can be adjusted by adjusting the clamp for ultrasonic welding, and the clamp for ultrasonic welding can adjust the width according to requirements; first distance h 1The calculation can be performed by the distance between the outer edges of the two solder marks 12 and the thickness d of the battery cell 1.
Further, referring to fig. 1 to 3, the first distance h between the edge 10 of the battery cell 1 close to the tab 11 and the weld mark 12 of the tab 11 is determined1The method comprises the following steps: obtaining the thickness d of the battery cell 1, the width m of the welding mark 12 on the tab 11, and the current battery cell 1 and the adapter plate2, when the two lugs 11 are horizontally placed for welding and fixing, the distance x between the welding prints 12 of the two lugs 11 on the same adapter plate 2 is kept; calculating the first distance h according to the distance x, the thickness d of the battery cell 1 and the width m of the welding mark 12 on the tab 111. That is, the first distance h may be calculated according to the related parameters when the electrical core 1 and the interposer 2 of the conventional design are horizontally placed1Numerical value, 1 level of electric core of traditional design is placed, top cap 3 is also placed horizontally, the switching piece 2 and the top cap 3 welded fastening of doing electric core, in this kind of traditional design, the interval between the seal 12 of welding of two utmost point ears 11 of relative setting on same switching piece 2 is x, the width of top cap 3 is L, the thickness of electric core 1 is d, the width of seal 12 is m, wherein, the width L of top cap 3 in the traditional scheme, the width d of electric core 1 and the width m of seal 12 all can with the width L of top cap 3 in the scheme that this application slope set up, the thickness d of electric core 1 and the width m of seal 12 correspond equally. After the distance x, the thickness d of the battery cell 1 and the width m of the solder mark 12 are obtained, the formula h can be used 1Calculating the first distance h as (x +2m-2d)/21Where d is 2t, t is half the thickness of a single winding core. Wherein the width of the adapter plate 2 is y; of course, the formula h can also be used1＝(k2-2h2-2d)/2 to calculate the first distance h1Due to the value of k2-2h2When the distance x and the width m of the solder mark 12 are known, x +2m can be calculated as (k)2-2h2) The numerical value of (c).
Referring to fig. 4, in some alternative embodiments, before step 1, before welding the tab 11 of the battery cell 1 and the interposer 2 together to form a dry battery cell, the method may further include: determining a first width W of a pole piece base material 13 in a pole piece 14 of the battery cell 11(ii) a By the first width W of the pole piece base material 131The battery cell 1 is manufactured by using the pole piece 14. That is, before the electric core 1 is processed and manufactured, the width of the required pole piece substrate 13 is calculated in advance, so as to ensure that the length of the tab 11 manufactured by the pole piece substrate 13 is not too long. Before the electric core 1 is manufactured, materials such as a top cover 3, an adapter sheet 2, a foil, a diaphragm and the like required by design can be prepared.
Further, referring to fig. 1, 2 and 6, the determining of the first width W of the pole piece base material 13 in the pole piece 14 of the battery cell 1 is performed1The method comprises the following steps: when the battery cell 1 and the adapter sheet 2 are horizontally placed for welding and fixing, the distance x between the welding prints 12 of the two tabs 11 on the same adapter sheet 2 and the second width W of the pole piece base material 13 of the battery cell 1 are obtained 2And a second distance h between the edge 10 of the cell 1 and the weld seal 12 of the corresponding tab 112(ii) a That is, the second width W2And a second distance h2Are all parameters when the corresponding battery core 1 is in a horizontal state; 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 and the second width W2And the second distance h2Calculating the first width W1The specific calculation method may be to calculate the first distance h between the edge 10 of the electrical core 1 and the welding mark 12 of the tab 11 when the electrical core is obliquely disposed according to the present application1Wherein the first distance h1Can be calculated by the above method, which is not described herein, and then uses the formula W1＝W2-(h2-h1) Calculating a first width W1Wherein h is2When the battery cell 1 is horizontally arranged in the conventional scheme, the distance between the edge 10 of the battery cell 1 and the welding mark 12 of the tab 11 is also the second distance h2。
Further, the edge 10 of the obliquely welded electrical core 1 is at a first distance h from the weld impression 121A second distance h from the edge 10 of the cell 1 to the weld 12 between conventional welding2Between which is 0 < h1＜h2A first width W of the pole piece base material 131＝W2-(h2-h1)＝W2-n。
Further, referring to fig. 6 and 7, the first width W of the pole piece substrate 13 is utilized1The manufacturing of the battery cell 1 of the pole piece 14 may include: rolling the pole piece 14 and the diaphragm on a winding device to form a winding core, wherein the width of the pole piece base material 13 of the pole piece 14 is the first width W 1(ii) a The winding cores are combined together to form the electric core 1, and then the electric core is bundled by an adhesive tape 6 and flows to an ultrasonic welding procedure. At this time, the formed battery core 1 is manufactured according to the width of the pole piece base material 13 calculated in advance, that is, the specification and the size of the battery core 1 required in the subsequent oblique welding of the application.
On the basis of the above technical solutions, referring to fig. 4 and 5, before the winding the pole piece 14 and the separator into the 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 base material 13 of the pole piece 14 is the first width W1(ii) a Cutting the pole piece base material 13 of the pole piece 14 to form the pole lug 11, so that the length of the pole lug 11 is the first width W1The length of the tab 11 formed after cutting is ensured to be reduced compared with the conventional tab 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 a value range of the inclination angle θ is calculated according to the width L of the top cover 3, a distance f between tops of two battery cells 1 on opposite sides of the top cover 3 when the battery cells 1 are placed in an inclined manner, and a thickness d of the battery cells 1. In the embodiment, the value range of the inclination angle theta is more than 0 degree and less than {90 degrees-arccos [ (L-f)/4d ] }, the preferable angle theta is 18 degrees, the problem that the laser equipment 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. Wherein the minimum of f just is the width of adaptor piece 2 welding duckbilled, because when adaptor piece 2 welds, the duckbilled on the laser equipment can push down on the adaptor piece to ensure that the adaptor piece is more nearly with the 3 laminating of top cap, be unlikely to the laminating and the clearance influences the welding effect appears, set up the minimum of f to be exactly the width of adaptor piece 2 welding duckbilled in this embodiment, can avoid the duckbilled to press to roll up the core when pushing down on, cause and scrap.
Further, as shown in fig. 9, after step 4, after the dry electric core is welded to the top cover 3, the dry electric core may be combined and bundled into a housing to complete the oblique welding process. The distance difference n between the edge 10 of the obliquely welded electrical core 1 and the weld mark 12 is h2-h1The width of the foil that > 0, where n is also the bevel weld, can be reduced, i.e. the bevel weld of the present application can reduce the width of the pole piece substrate 13. And adopt the bookApplication slope welded electric core 1 internal space k1The distance k between the cell 1 and the traditional welding2The width L of the top cover 3 has a relationship k1＜L＜k2And the space in the battery cell 1 is effectively reduced.
A specific example of the present application is given below:
for example, if the conventional battery cell 1 is horizontally disposed, the distance x between the welding marks 12 is 43mm, the width m of the welding mark 12 is 6mm, and the thickness d of the battery cell 1 is 17.8mm, then the first distance h from the edge 10 of the obliquely welded ultrasonic-welded battery cell 1 to the welding mark 12 of the tab 11 is the first distance h1(43+2 x 6-2 x 17.8)/2 x 9.7 mm; a second distance h between the edge 10 of the electrical core 1 and the weld seal 12 of the tab 11, as is conventional for ultrasonic welding214.7mm, second width W of the pole piece substrate 13231.5mm, the first width W of the obliquely welded pole piece base material 13 can be obtained 131.5- (14.7-9.7) ═ 26.5mm, the width of the pole piece base material 13 is decreased by an amount n equal to W2-W15.0 mm. Winding the inclined welding pole piece 14 into the battery core 1 through relevant procedures, bundling the inclined welding pole piece to the ultrasonic welding procedure by using the adhesive tape 6 during matching, and adjusting the first distance h from the edge 10 of the battery core 1 to the welding mark 12 in the ultrasonic welding procedure1The thickness of the battery core is 9.7mm, and a tab 11 of the battery core 1 is welded with the adapter plate 2 through ultrasonic waves; the dry cell after ultrasonic welding is transferred to a second clamp 5 with a welding inclination angle theta of the switching sheet 2 being 18 degrees, the switching sheet 2 and a top cover 3 arranged on a first clamp 4 are welded together by laser, the cell 1 is bundled by an adhesive tape 6 after core combination, the redundancy of an outer side tab 11 bundling the core cell 1 in the graph 9 can be reduced, the risk that the tab 11 is inserted into the cell 1 after the redundancy is reduced, meanwhile, the tab 11 is shortened, and the abnormal phenomena of poor edge collapse, tearing and folding of the tab 11 caused in the manufacturing process can be reduced.
Further, according to the schematic diagrams 6, 7 and 8, the internal spacing k of the battery cell 1 at this time19.7 × 2+43+2 × 6 ═ 74.4mm, the spacing k in the conventionally designed cell 1284.4mm and the width of the top cover 3 is 77.8 mm. The length of the pole lug 11 and the redundancy of the pole lug 11 are optimized by adopting an inclined welding process under the condition of ensuring the design requirement, and if the traditional horizontal placement welding process is adopted, the corresponding pole lug 11 is used Under the condition of reduced spacing, the width of the top cover 3 is limited, and the corresponding optimized design cannot be achieved.
The width of the pole piece base material 13 used by the traditional horizontal welding battery core 1 is 31.5mm, and the distance h from the edge 10 of the battery core 1 to the welding seal 12 of the pole ear 11214.7mm, the welding process of core is placed to the level that switching piece 2 welded electric core 1 adopted the graphic presentation 3, the welding is accomplished this moment after, tie up the outside utmost point ear 11 redundancy that closes core electric core 1 and can not reduce in the graphic presentation 9, compare utmost point ear 11 in this application embodiment, traditional utmost point ear 11 redundancy can be 5.0mm more, redundant many utmost point ear 11 can insert the risk in electric core 1, utmost point ear 11 in this application embodiment is compared to substrate width simultaneously can be wide 5.0mm, the utmost point ear 11 length that corresponds also is long 5.0mm, the increase of utmost point ear 11 length has also increased the manufacturing process and has scrapped, the safety risk of epidemic situation has been increased simultaneously.
In summary, compared with the conventional method of horizontally placing and welding the battery cell 1, the oblique welding method provided by the embodiment of the invention is not limited by the width of the top cover 3, the distance from the diaphragm of the battery cell 1 to the welding mark 12 can be freely adjusted, the flexibility of ultrasonic welding is improved, and the parameters of ultrasonic welding can be adjusted according to actual requirements; under the condition of meeting the design requirement, the width of the base material can be reduced, the using amount of the foil is reduced, the cost can be saved, and meanwhile, the mass energy density of the battery cell 1 is also improved; on the basis of shortening the width of the pole piece substrate 13, the pole ear 11 wrinkling caused by the excessively wide width of the substrate, the edge collapse of the pole ear 11, the micro short circuit caused by the tearing and burr of the pole ear 11 and the short circuit abnormality caused by the folding of the pole ear 11 in the manufacturing process can be reduced, 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, which is used 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 configured to place a dry battery cell, wherein the second fixture 5 is distributed on two opposite sides of the first fixture 4, and is configured to place at least two battery cells 1 of the dry battery cell, and a 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. By arranging the second clamp 5 which is inclined, after the battery cell 1 is placed on the second clamp 5, the battery cell 1 is arranged obliquely relative to the top cover 3, which further helps to reduce the length of the tab 11.
Further, the inclination angle θ is an acute angle, and the value range of the inclination angle θ is calculated by the width L of the top cover 3, the distance f between the tops of the two battery cells 1 on the two opposite sides of the top cover 3 when the battery cells 1 are obliquely placed, and the thickness of the battery cells 1. In the embodiment, the value range of the inclination angle theta is more than 0 degree and less than {90 degrees-arccos [ (L-f)/4d ] }, the preferable theta is 18 degrees, the problem that the laser equipment 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 terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
It is to 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that 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 (10)
1. A welding method of a battery core is characterized by comprising the following steps:
welding a lug (11) of the battery cell (1) and the adapter sheet (2) together to form a dry battery cell;
placing the top cover (3) on the first clamp (4);
placing the dry cell on a second clamp (5) so that the cell (1) is obliquely arranged towards the direction close to the top cover (3);
and welding the adapter plate (2) and the top cover (3) together.
2. The method for welding the battery cell of claim 1, wherein before the step of welding the tab (11) of the battery cell (1) and the adaptor sheet (2) together to form the dry battery cell, the method further comprises the following steps:
determining a first distance h between an edge (10) of the battery cell (1) close to the tab (11) and a welding mark (12) of the tab (11) 1；
According to the first distance h1Adjusting the core (1)The distance between the edge (10) and the adapter plate (2).
3. The method for welding the battery cell of claim 2, wherein: determining a first distance h between an edge (10) of the battery cell (1) close to the tab (11) and a weld mark (12) of the tab (11)1The method comprises the following steps:
obtaining the thickness d of the battery cell (1), the width m of the welding prints (12) on the lugs (11) and the distance x between the welding prints (12) of two lugs (11) on the same adapter sheet (2) when the battery cell (1) and the adapter sheet (2) are horizontally placed for welding and fixing;
calculating the first distance h according to the distance x, the thickness d of the battery cell (1) and the width m of a welding mark (12) on the lug (11)1。
4. The method for welding the battery cell of claim 1, wherein before the step of welding the tab (11) of the battery cell (1) and the adaptor sheet (2) together to form the dry battery cell, the method further comprises the following steps:
determining a first width W of a pole piece substrate (13) of a pole piece (14) of the cell (1)1；
By means of a first width W of the pole piece base material (13)1The pole piece (14) of (2), make said electric core (1).
5. The method of welding a cell according to claim 4, wherein the determining of the first width W of the pole piece substrate (13) in the pole piece (14) of the cell (1) 1The method comprises the following steps:
when the cell (1) and the adapter sheet (2) are horizontally placed for welding and fixing, the distance x between welding marks (12) of two lugs (11) on the same adapter sheet (2) and the second width W of a pole piece base material (13) of the cell (1) are obtained2And a second distance h between the edge (10) of the cell (1) and the seal (12) of the corresponding tab (11)2；
According to the distance x, the thickness d of the battery core (1), the width m of a welding mark (12) on the tab (11) and the second width W2And the second distance h2The first width W1 is calculated.
6. The method of welding a cell according to claim 4, wherein the first width W of the base material (13) is utilized as the pole piece1The pole piece (14) of, the preparation of electric core (1), include:
rolling the pole piece (14) and the diaphragm into a roll core on a winding device, wherein the width of a pole piece base material (13) of the pole piece (14) is the first width W1；
And combining the winding cores together to form the battery core (1).
7. The method for welding the battery cell of claim 6, wherein before the step of winding the pole piece (14) and the diaphragm into a winding core on a winding device, the method further comprises the following steps:
coating active substances on a foil to form the pole piece (14), wherein a pole piece base material (13) of the pole piece (14) is the first width W 1；
And cutting the pole piece base material (13) of the pole piece (14) to form the pole ear (11).
8. The method for welding the battery core according to claim 1, wherein:
the inclination angle theta between the battery cell (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 the two battery cells (1) on the 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).
9. A welding fixture for use in a method of welding cells according to any of claims 1 to 8, comprising:
a first clamp (4), wherein the first clamp (4) is used for placing the top cover (3);
and the second clamp (5) is used for placing the dry cell, and an inclined angle theta is formed between the surface of the second clamp (5) and the surface of the first clamp (4).
10. The welding fixture of claim 9, wherein:
the inclination angle theta 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 the two battery cells (1) on the 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548597A (en) * | 2022-11-29 | 2022-12-30 | 瑞浦兰钧能源股份有限公司 | Secondary battery welding method and battery thereof |
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| 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 |
| 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 |
| 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 |
| 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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| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115548597A (en) * | 2022-11-29 | 2022-12-30 | 瑞浦兰钧能源股份有限公司 | Secondary battery welding method and battery thereof |
| CN115548597B (en) * | 2022-11-29 | 2023-04-21 | 瑞浦兰钧能源股份有限公司 | Welding method of secondary battery and battery thereof |
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| CN114678665B (en) | 2024-05-28 |
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