CN115870560A - Cutting mechanism and packaging method - Google Patents
Cutting mechanism and packaging method Download PDFInfo
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- CN115870560A CN115870560A CN202211722872.XA CN202211722872A CN115870560A CN 115870560 A CN115870560 A CN 115870560A CN 202211722872 A CN202211722872 A CN 202211722872A CN 115870560 A CN115870560 A CN 115870560A
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- current collector
- cutting
- collector extension
- cutter
- cutting edge
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- 238000005520 cutting process Methods 0.000 title claims abstract description 221
- 230000007246 mechanism Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 21
- 238000003825 pressing Methods 0.000 claims description 29
- 230000007704 transition Effects 0.000 claims description 23
- 238000003466 welding Methods 0.000 claims description 23
- 239000000565 sealant Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000012785 packaging film Substances 0.000 claims description 4
- 229920006280 packaging film Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 12
- 239000003292 glue Substances 0.000 description 7
- 239000011888 foil Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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Images
Classifications
-
- 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
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a cut mechanism and packaging method, should cut the mechanism and include: a clamping assembly for clamping and fixing the current collector extension group; and a side cutter for cutting the side edge of the current collector extension group clamped and fixed by the clamping component along a first direction; wherein the first direction is a thickness direction of the current collector extension group. In above-mentioned technical scheme, through adopting clamping assembly to press from both sides the fastening with the mass flow body extension group and decide, cutting the mass flow body extension group through the side cutter to the stability of mass flow body extension group when the cutting and the effect of cutting have been improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a cutting mechanism and a packaging method.
Background
The overlapping degree of the traditional lithium battery lamination or the wound pole piece outer leakage foil cannot be completely overlapped, the left and right overlapping degree deviation of the traditional pole piece outer leakage foil is in the range of 0.5-1.5mm and is influenced by the lamination/winding thickness, and after the upper side of the pole piece outer leakage foil is shaped, the overlapping deviation is as high as more than half of the distance of the lamination/winding thickness.
The solution of traditional lithium cell is with the upside plastic back of the outer hourglass foil material of cross cutting pole piece, prewelding, then cuts out the coincidence deviation, guarantees the alignment degree at top, but bad phenomena such as rosin joint/deep-fry welding easily appear in welding edge position to traditional lithium cell, and the rosin joint can lead to the battery internal resistance to increase, and deep-fry welding can lead to the electrolyte corrosion resistance of utmost point ear to descend, and long-time electrolyte soaks the back, can lead to a series of abnormal problems such as internal resistance increase, metal fillings drop.
Disclosure of Invention
The application provides a cutting mechanism and a packaging method, which are used for improving the effect of a current collector extension group of a battery cell after welding.
In a first aspect, a cutting mechanism is provided, which includes: a clamping assembly for clamping and fixing the current collector extension group;
and a side cutter for cutting a side edge of the current collector extension group clamped and fixed by the clamping assembly in a first direction; wherein,
the first direction is a thickness direction of the current collector extension group.
In above-mentioned technical scheme, through adopting clamping assembly to fix the clamp of mass flow body extension group, cut mass flow body extension group through the side-cutting knife to improved the stability of mass flow body extension group when the cutting and the effect of cutting, and adjusted the shape of mass flow body extension group through the mode of side cut, with the security that improves electric core or improve utmost point ear processing technology.
In a particular possible embodiment, the clamping assembly is provided with a channel;
the side edge to be cut on the current collector extension part group is exposed in the passage;
the side cutter is movable within the channel in a first direction.
In a specific possible implementation, the number of the channels is two, and the two channels are arranged at intervals;
the number of the side cutters is one, one side cutter can move in one channel along the first direction, cutting edge structures are arranged on two sides of the side cutter, and the shapes of the cutting edge structures on the two sides are in mirror symmetry with the center line of the side cutter; or,
the number of the side cutters is two, the two side cutters can move in the two channels in the first direction in a one-to-one correspondence mode, the two side cutters are provided with cutting edge structures on the side faces, close to each other, of the two side cutters, and the shapes of the two cutting edge structures are in mirror symmetry with the center line of the two side cutters.
In a specific possible embodiment, the clamping assembly comprises: the first pressing plate and the second pressing plate are oppositely arranged; wherein a space for accommodating the current collector extension group is formed between the first pressing plate and the second pressing plate;
and at least one of the first and second platens is movable relative to the other platen in the first direction.
In a specific embodiment, the first pressing plate is provided with a first through hole, and the second pressing plate is provided with a second through hole; wherein,
the first through holes and the second through holes are arranged at intervals along the first direction;
an inner cavity between the first through hole and the second through hole is a part of the channel.
In a specific embodiment, the first pressing plate is provided with a first notch, and the second pressing plate is provided with a second notch; wherein,
the first notches and the second notches are arranged at intervals along the first direction;
the space enclosed by the first notch and the second notch is a part of the channel.
In a specific possible embodiment, the side cutter has a straight cutting edge and a first arc cutting edge connected to the straight cutting edge, and the straight cutting edge and the first arc cutting edge are located at one end of the side cutter close to the current collector; wherein,
the first arc line cutting edge is an arc line cutting edge with an arc line convex outwards.
In a particular embodiment, the side cutter further comprises a second curved cutting edge connected to the first curved cutting edge and the first curved cutting edge is located between the straight cutting edge and the second curved cutting edge;
the second arc line cutting edge is an arc line cutting edge with an arc line concave inwards.
In a specific embodiment, the cutting device further comprises an overhead cutting component;
the top cutting assembly comprises a first cutter and a second cutter which are oppositely arranged; the first cutter and the second cutter are used for respectively abutting against two opposite sides of the top edge of the current collector extension part group in a cutting state; wherein,
at least one of the first cutter and the second cutter can move along the first direction relative to the other cutter.
In a second aspect, a method for encapsulating a battery cell is provided, where the method includes the following steps:
welding the current collector extension part group;
cutting the side edge of the welded current collector extension group;
applying sealant on the cut current collector extension group;
and packaging the battery core, and packaging the region applied with the sealant on the current collector extension group through a packaging film.
In a specific possible embodiment, the cutting is performed on the side edge of the welded current collector extension group; the method specifically comprises the following steps:
and after the side edge of the current collector extension part group is cut, the metal burr is less than or equal to 50 mu m.
In a specific possible embodiment, the cutting is performed on the side edge of the welded current collector extension group; further comprising:
cutting a first arc-shaped transition angle at one end, close to the cell main body, of the side edge of the current collector extension group; wherein,
the first arc transition angle is an inwards concave arc angle.
In a specific possible embodiment, the cutting is performed on the side edge of the welded current collector extension group; further comprising:
cutting a second arc-shaped transition angle connected with the first arc-shaped transition angle at one end, close to the cell main body, of the side edge of the current collector extension group; wherein,
the second arc-shaped transition angle is an outward convex arc-shaped angle.
Drawings
Fig. 1 shows a schematic structural diagram of a battery cell provided in an embodiment of the present application;
fig. 2 shows a schematic structural diagram of a cell package provided in an embodiment of the present application;
fig. 3 illustrates a schematic view of a current collector extension weld provided by an embodiment of the present application;
FIG. 4 is a schematic structural diagram illustrating a side cut assembly provided by an embodiment of the present application;
FIG. 5 is a reference diagram illustrating a use state of a side cutting assembly provided by an embodiment of the application;
FIG. 6 shows a schematic structural diagram of a side cutter provided in an embodiment of the present application;
FIG. 7 is a schematic structural diagram of another side cutter provided in an embodiment of the present application;
fig. 8 shows a schematic structural view of another side cutter cutting a current collector extension provided by an embodiment of the present application;
FIG. 9 illustrates a schematic structural diagram of an overhead cutting assembly provided by an embodiment of the present application;
FIG. 10 illustrates a use state reference diagram of an overhead cutting assembly provided by an embodiment of the present application;
fig. 11 shows a flowchart of a packaging method provided in an embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, the technical features related to the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
To facilitate understanding of the cutting mechanism provided in the embodiments of the present application, an application scenario thereof is first described. The cutting mechanism that this application embodiment provided is applied to the cutting to the mass flow body extension, and this mass flow body extension is the mass flow body and extends as the utmost point ear or be used for connecting the part of external utmost point ear. However, when the current collector is stacked or wound, the current collector extension portion may be misaligned after stacking, and thus, a difference may occur in the case of performing a cold welding or a flash welding. Therefore, the cutting mechanism provided by the embodiment of the application can cut the overlapped current collector extension part, and the welding effect is improved. The details of which are described below in connection with specific figures and examples.
To facilitate understanding of the cutting mechanism provided in the embodiments of the present application, the current collector extension portion cut by the cutting mechanism is first described. Referring to fig. 1, a structure of a cell is illustrated in fig. 1, and the cell includes a plate group and a current collector extension group 20. The pole piece group comprises a current collector group, the current collector group comprises a plurality of current collectors 10, and the current collectors 10 serve as carriers for bearing active materials in the pole pieces of the battery core. When the pole piece group of the battery cell comprises a plurality of positive pole pieces and a plurality of negative pole pieces, the positive pole pieces and the negative pole pieces are alternately stacked. Correspondingly, the current collector set comprises a positive current collector and a negative current collector, and the positive current collector and the negative current collector are alternately stacked.
When the lamination forms electric core, positive plate and negative pole piece are formed through the range upon range of preparation of equipment, and keep apart through the diaphragm between positive plate and negative pole piece, realize the electric isolation between positive plate and the negative pole piece, avoid positive plate and negative pole piece short circuit in electric core.
The current collector extension group 20 includes a plurality of current collector extensions 21 disposed in a stacked manner, and for convenience of description, a stacking direction or a thickness direction of the plurality of current collector extensions 21 is defined as a first direction. The current collector extension 21 is a protrusion extending from the current collector 10, that is, the protrusion and the current collector 10 are an integral structure. In forming the current collector extension set 20, the plurality of current collector extensions 21 are connected by metal bonding, thereby forming an integral structure. For example, the metal bonding between the current collector extensions 21 may be formed by cold welding or hot welding.
When the battery is connected to an external circuit, the current collector extension group 20 is configured to be electrically connected to a conductor outside the battery, that is, the current collector extension group 20 is configured to be connected to the external circuit of the battery. Illustratively, when the battery is assembled, the current collector extension set 20 extends at least partially out of the package of the battery, which is used to encapsulate the pole pieces, when the battery includes the package.
When the battery includes a casing for accommodating the battery cell, the current collector extension group 20 at least partially extends out of the casing of the battery, and the portion of the current collector extension group 20 exposed out of the casing is used for connecting with a circuit outside the battery. Of course, the current collector extension group 20 provided in the embodiment of the present application may also be used as a structure connected with an external tab. At this point, when assembled, the set of current collector extensions 20 is positioned within the case and the tabs are welded to the set of current collector extensions 20 and extend outside the case for connection to a circuit external to the battery. It should be noted that the structure of the current collector extension group 20 is not limited to the above example, the extension length and the number of stacked layers of the current collector extension group 20 are not limited herein, and the current collector extension group 20 may be configured other than the above example, and may be cut by using the cutting mechanism described in the present application.
Referring to fig. 2, during the manufacturing process, the current collector extension set 20 needs to be welded to form a single piece. After welding, the sealant 30 is applied on the current collector extension group 20, and an encapsulation film 40 is encapsulated, where the encapsulation film 40 may be an aluminum-plastic film, so as to complete the preparation of the battery cell. The encapsulation film 40 applies an area of the sealant 30 when the encapsulation film 40 encapsulates the current collector 10.
Referring to fig. 3, in order to ensure the safety of the welding gun, a part of the non-welded area is left at the edge of the current collector extension group 20 during welding. At this time, the current collector extension 21 may be divided into a welded area 211 and an unwelded area 213. The welded area 211 and the non-welded area 213 are distinguished by a dotted line. The cutting mechanism provided by the embodiment of the present application is used to cut and trim the edge of the current collector extension set 20, and the cutting area is the area to be cut 212 shown in fig. 3. The cutting mechanism provided by the embodiment of the present application is described in detail below with reference to specific drawings.
Referring to fig. 4, fig. 2 shows a schematic structural diagram of a cutting mechanism provided in the present application according to an embodiment of the present application. The cutting mechanism provided by the embodiment of the present application may include a side cutting assembly, and the main structure of the side cutting assembly includes two parts, namely a clamping assembly 100 and a side cutter 200. Wherein the clamping assembly 100 is used for clamping and fixing the current collector extension group, and the side cutter 200 is used for cutting the side of the current collector extension group clamped and fixed by the clamping assembly 100 along the first direction.
Compare in prior art just to the upside plastic of mass flow body extension group (the pole piece leaks the foil material outward promptly), can not handle its both sides, this application is through using the both sides that the side cutter amputates mass flow body extension group for utmost point ear manufacturing process and utmost point ear structure all improve to some extent. The side cutter is used for cutting off two sides of the pre-welded current collector extension part group, and therefore bad phenomena of insufficient soldering/deep-fried soldering and the like at the welding edge position are avoided or reduced. In addition, the two sides of the current collector extension part group are subjected to shaping treatment, the edges of the two sides are neat and flat, the adhesive tape sticking process is convenient to carry out, and the packaging effect is ensured.
The following detailed description is to be read with reference to the figures.
The clamping assembly 100 provided by the embodiment of the present application includes a first pressing plate 110 and a second pressing plate 120, wherein a space for accommodating the current collector extension group is formed between the first pressing plate 110 and the second pressing plate 120.
When the first and second pressing plates 110 and 120 are specifically provided, the first and second pressing plates 110 and 120 are spaced apart in the first direction. And at least one of the first and second platens 110, 120 is movable relative to the other such that the first and second platens 110, 120 can clamp the set of fixed current collector extensions.
Illustratively, in one possible embodiment, the second platen 120 is a stationary platen, the first platen 110 is a moving platen, and the direction of movement of the first platen 110 is in a first direction. When clamping the current collector extension group, the first pressing plate 110 is first moved away from the second pressing plate 120 so that the space between the two is increased.
Referring to fig. 5 together, fig. 5 is a schematic structural diagram illustrating the cutting mechanism cutting the current collector extension group. When using the cutting mechanism, the current collector extension group 20 is first placed on the first pressure plate 110, and then the second pressure plate 120 is moved toward the first pressure plate 110, and the current collector extension group 20 is clamped between the first pressure plate 110 and the second pressure plate 120. Wherein the first pressing plate 110 can be driven by a driving mechanism. For example, the driving mechanism can be a motor, a hydraulic cylinder, or a pneumatic cylinder. It should be appreciated that the above-described drive mechanism may provide a pressing force of the first pressing plate 110 to press the plurality of current collector extensions between the first pressing plate 110 and the second pressing plate 120 to fix the current collector extension set 20.
In the present embodiment, the clamping assembly 100 is provided with a channel 130; the passages 130 are configured to expose the sides of the current collector extension sets to be cut (the areas 212 to be cut shown in fig. 3). For example, when the clamping assembly 100 clamps the current collector extension assembly, the side of the current collector extension assembly that needs to be cut may be exposed within the channel 130. When the side cutter 200 is cutting the side of the current collector extension group, the side cutter 200 may move in the first direction within the passage 130 to cut the side of the current collector extension group.
When the channels 130 are specifically arranged, the number of the channels 130 is two, and the two channels 130 are arranged at intervals; and respectively correspond to two side edges of the current collector extension part group. When the number of the passages 130 is two, the number of the corresponding side cutters 200 may be one or two.
When the number of the side cutters 200 is one, the side cutters 200 may alternatively move in one of the channels 130 in the first direction. In a particular cut, the side cutters 200 may first cut a side edge of the set of current collection extensions within one of the channels 130. After the cutting is completed, the side cutter 200 enters another passage 130 again to cut, so as to respectively cut the two side edges of the current collector extension portion. In this case, both sides of the side cutter have cutting edge structures, the shape of which is mirror symmetrical about the midline of the side cutter.
When the number of the side cutters 200 is two, the two side cutters 200 may move in the first direction in the two channels 130 in one-to-one correspondence. That is, the two side cutters 200 may be inserted into the two passages 130, respectively, to cut. In this case, both side cutters have cutting edge structures on their sides which are adjacent to each other, the shape of both cutting edge structures being mirror-symmetrical about the median line of the two side cutters. Therefore, the cutting of the side edge of the current collector extension part group can be completed through one-time cutting, and the cutting effect is improved.
As one example, when the clamping assembly 100 includes the first and second platens 110, 120 described above, the channels 130 can be formed on the first and second platens 110, 120 by different structures.
Illustratively, in one embodiment, the first pressing plate 110 is provided with a first through hole 131, and the second pressing plate 120 is provided with a second through hole 132; the first through holes 131 and the second through holes 132 are arranged at intervals along a first direction; the inner cavity between the first through hole 131 and the second through hole 132 is a part of the channel 130. When the first through hole 131 and the second through hole 132 are specifically provided, the first through hole 131 and the second through hole 132 may be long waist-shaped holes, and the first through hole 131 and the second through hole 132 are oppositely provided along the first direction and are arranged at two sides of the current collector extension group in the stacking direction.
The first through hole 131, the second through hole 132, and the first through hole 131 and the second through hole 132 form the channel 130. In the case of using one side cutter 200, both sides of the side cutter 200 are provided with cutting edge structures having mirror-symmetrical shapes about their own axes. When the side cutter 200 moves in the first direction in the passage 130, it is first inserted into the first through hole 131, and when the side cutter 200 continues to move in the first direction, it cuts the side of the current collector extension group and enters the second through hole 132 after the cutting is completed.
It should be understood that when the first through hole 131 and the second through hole 132 are provided, it should be ensured that the side edge to be cut of the current collector extension group is located in the first through hole 131 and the second through hole 132, that is, the vertical projection of the side edge to be cut along the first direction is located in the first through hole 131 and the second through hole 132, so as to ensure that the side edge to be cut of the current collector extension group can be cut when the side cutter 200 moves in the first through hole 131 and the second through hole 132.
When the side cutter 200 moves in the first direction, the moving direction of the side cutter 200 may be defined by the sidewalls of the first and second through holes 131 and 132, that is, the side cutter 200 is pressed against the sidewalls of the first and second through holes 131 and 132, so as to ensure stability in cutting.
As a variation, the channel 130 provided in the embodiment of the present application may be formed in other structures. Illustratively, the first pressing plate 110 is provided with a first notch, and the second pressing plate 120 is provided with a second notch; the first notches and the second notches are arranged at intervals along a first direction; the lumen between the first and second indentations is part of the channel 130. When specifically setting up first breach and second breach, first breach and second breach can be long waist type hole, and first breach and second breach set up along first direction relatively to be listed as in the both sides of the range upon range of direction of mass flow body extension group.
The first notch, the second notch, and the first notch and the second notch form the channel 130. When the side cutter 200 moves in the first direction in the passage 130, it is first inserted into the first notch, and when the side cutter 200 continues to move in the first direction, it cuts the side edge of the current collector extension group and enters the second notch after the cutting is completed.
It should be understood that, when the first notch and the second notch are provided, it should be ensured that the side to be cut of the current collector extension group is located in the first notch and the second notch, that is, the vertical projection of the side to be cut along the first direction is located in the first notch and the second notch, so as to ensure that the side to be cut of the current collector extension group can be cut when the side cutter 200 moves in the first notch and the second notch.
When the channel 130 is formed by the notch, the side cutter 200 may also be supported by the side wall of the notch to ensure stability during cutting, which will not be described in detail herein.
The side cutter 200 may move in a first direction by the side cutter 200 when cutting the current collector extension to cut the plurality of current collector extensions. When the side cutter 200 is driven to move, the side cutter can be driven by a driving mechanism, the driving mechanism can be a hydraulic cylinder or an air cylinder, and the side cutter 200 is fixedly connected with a piston rod of the hydraulic cylinder or the air cylinder so as to realize the reciprocating movement of the side cutter 200 in the first direction through the expansion and contraction of the piston rod. It should be understood that the driving mechanism may be other linear driving mechanisms besides the above-mentioned hydraulic cylinder or air cylinder, and is not particularly limited in the embodiments of the present application.
When the side cutter 200 specifically cuts the current collector extension part, the cutting metal burr is less than or equal to 50 μm, so that the side edge of the cut current collector extension part group meets the burr standard, and the current collector extension part group meets the heat-seal adhesive coating standard.
The side cutter 200 provided by the embodiment of the present application can adopt side cutters 200 with different cutting edges, and the following description is made with reference to specific drawings.
Referring to fig. 6, fig. 6 shows a schematic view of the structure of the side cutter. The side cutter 200 provided in the embodiment of the present application has a straight cutting edge 210 and a first arc cutting edge 220 connected to the straight cutting edge 210, wherein the straight cutting edge 210 and the first arc cutting edge 220 are located at one end of the side cutter 200 close to the current collector.
When the linear cutting edge 210 is specifically disposed, the length direction of the linear cutting edge 210 is along the length direction of the side of the current collector extension part, and the linear cutting edge is disposed in a manner parallel or approximately parallel to the length direction of the side. So that the straight cutting edge 210 can cut the side edge of the current collector extension.
The first arc cutting edge 220 is a cutting edge for cutting the connection portion of the current collector extension and the current collector. In particular arrangements, the first curved cutting edge 220 is a curved cutting edge with a convex curve. The arc line cutting edge with the arc line protruding outwards refers to the arc line protruding outwards and faces the current collector extension part, the first arc line cutting edge 220 can form an inwards concave fillet at the connection part of the current collector extension part and the current collector, so that arc transition can be adopted between the side edge of the current collector extension part group and the current collector, the formation of a tip at the connection part of the side edge of the current collector extension part group and the current collector is avoided, and the current collector extension part group meets the heat seal adhesive coating standard; cut out fillet structure and cut out right angle structure and compare, be difficult for producing metal fragments, avoid because of the internal short circuit phenomenon that metal fragments produced. The side edge of the current collector extension group adopts arc transition, so that potential safety hazards caused by sharp corners of the current collector extension group in the battery core, such as puncture of an aluminum plastic film, can be prevented.
It should be appreciated that the straight cutting edge 210 is rounded at the junction with the first curved cutting edge 220. It can be understood that the straight cutting edge 210 is a tangent line to the end of the first arc cutting edge 220 connected to the straight cutting edge 210, so as to ensure that the junction between the two cutting edges does not form a sharp protrusion or depression at the edge of the current collector extension group during cutting.
Referring to fig. 7, fig. 7 is a modified structure of the side cutter 200 shown in fig. 6. The side cutter 200 shown in fig. 7 may further include a second curved cutting edge 230 in addition to the straight cutting edge 210 and the first curved cutting edge 220 described above, the second curved cutting edge 230 being connected to the first curved cutting edge 220 and located on a side of the first curved cutting edge 220 facing away from the straight cutting edge 210. That is, when provided, the first curved cutting edge 220 is located between the straight cutting edge 210 and the second curved cutting edge 230.
In the embodiment of the present application, the second arc cutting edge 230 is an arc cutting edge with an arc concave inwards. That is, the concave direction of the second arc cutting edge 230 faces the current collector extension group, so that when the current collector extension group is cut, a convex fillet transition can be formed at the edge of the current collector extension group. It should be understood that the junction between the first arc cutting edge 220 and the second arc cutting edge 230 is an arc transition, so as to avoid the formation of a tip at the junction therebetween, ensure that the side of the cut current collector extension group is a smooth side, and avoid the formation of a tip protrusion after cutting.
As an alternative, the first curved cutting edge 220 and the second curved cutting edge 230 may be directly connected, or may be connected by a straight cutting edge 210. The embodiments of the present application are not particularly limited.
As an alternative, the first arc cutting edge 220 may be a circular cutting edge to form a circular corner when cutting the current collector extension group. When the current collector extension group is specifically cut, the first arc cutting edge 220 may cut an arc at a position of the current collector extension group, which is close to 1-10mm of the current collector. Such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, and the like. As shown in FIG. 8, the radius of the arc curvature of the first arcuate transition angle 214 formed when cutting may be between 1 and 10mm. Illustratively, the radii may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, and the like, at different radii.
Similarly, the second arc cutting edge 230 may also be an arc cutting edge, and the radius of the arc of the second arc transition angle 215 formed by cutting the second arc cutting edge may be 1-10 mm. Illustratively, the radii may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, and the like, at different radii.
As an optional solution, after cutting by using the side cutter of the cutting mechanism, the current collector extension group of the battery cell is formed with two width sections, namely a first width section and a second width section, wherein the first width section is closer to the electrode plate group than the second width section. The height of the first width section can be designed to be 1 mm-3 mm, and the height refers to the distance between the top edge of the first width section and the adjacent edge of the pole piece group. Therefore, the second arc cutting edge 230 may also adopt a chamfer structure with a pouring depth of 1mm to 3mm or a fillet structure with a size radius of 1mm to 3 mm.
Referring to fig. 9 and 10, fig. 9 shows a schematic structural diagram of an overhead cutting assembly, fig. 10 shows a reference diagram of a use state of the overhead cutting assembly, and a cutting mechanism provided by the embodiment of the present application further includes an overhead cutting assembly 300; the fixed edge cutting assembly is used for cutting the top edge of the current collector extension group. The top edge refers to an edge of the current collector extension group departing from the electrode plate group.
The mechanism that cuts in this application not only includes the side cutter, can also include the top and cut the subassembly. The shaping treatment can be carried out on the two sides of the current collector extension part group, the shaping treatment can also be carried out on the upper side of the current collector extension part group, and the bad phenomena of insufficient solder/explosive solder and the like at the welding edge position are greatly reduced. The cutting structure is not only suitable for the process of using the external pole lug in the prior art, but also suitable for the process of using the current collector extension part group as the external pole lug.
In a specific arrangement, the top cutting assembly 300 comprises a first cutter 310 and a second cutter 320 which are oppositely arranged; the first cutter 310 and the second cutter 320 are arranged oppositely along a first direction, and the cutting edges are opposite. When the cutting knife is used specifically, in a cutting state, the first cutting knife 310 and the second cutting knife 320 are respectively abutted against two opposite sides of the top edge of the current collector extension group. And at least one of the first cutter 310 and the second cutter 320 is movable in a first direction relative to the other cutter.
As an alternative, the second cutter 320 is a fixed cutter, and the second cutter 320 is a movable cutter. As shown in fig. 10, when cutting, first, the first cutting blade 310 is far away from the second cutting blade 320, and a gap accommodating the current collector extension group is formed between the first cutting blade 310 and the second cutting blade 320. The current collector extension set is placed on the second cutter 320. The first cutter 310 is driven to move towards the second cutter 320 and cuts the top edge of the current collector extension set during the movement. It should be understood that the driving mechanism of the first cutting knife 310 may adopt a motor, a hydraulic cylinder or an air cylinder, etc., and the specific connection manner is the same as the connection manner of the side cutting knife 200 and the driving mechanism, which is not described herein again.
It should be appreciated that where the cutting mechanism includes a side-cutting assembly and an overhead-cutting assembly 300, the top edge of the set of current collector extensions may be cut first by the overhead-cutting assembly 300 and then the side edges of the set of current collector extensions may be cut by the side-cutting assembly. Alternatively, the side edges of the current collector extension may be cut first by the side cutting assembly and then the top edges of the set of current collector extensions may be cut by the bank edge cutting assembly. The different cutting methods described above can be applied to the embodiments of the present application.
In above-mentioned technical scheme, through adopting clamping assembly to press from both sides the fastening with the mass flow body extension group and decide, cutting the mass flow body extension group through side cutter 200 to the stability of mass flow body extension group when the cutting and the effect of cutting have been improved.
It can be seen from the above description that, through the cutting mechanism that cuts the side of the current collector extension group, the two sides of the current collector extension group are kept flat, the current collector extension group meets the preparation work of attaching tab glue, after the tab glue is attached, the flat current collector extension group can ensure that no leakage/seepage problem occurs between the tab glue and the current collector extension group, and the qualified rate of the prepared finished battery can be ensured during further packaging with an aluminum-plastic film.
Referring to fig. 11, an embodiment of the present application further provides a method for packaging a battery cell, where the method includes the following steps:
step 001: welding the current collector extension part group;
specifically, during the preparation process of the battery cell, the current collector extension group needs to be welded so as to form a whole. When welding, in order to ensure the safety of a welding gun, a part of unwelded area is reserved at the edge of the current collector extension group. The edge (including the unwelded area and the partially welded area) of the current collector extension group is the edge to be cut.
In particular, the welding may be performed by different welding methods, for example, cold welding or hot welding may be used.
Step 002: cutting the side edge of the welded current collector extension group;
specifically, the side edge of the current collector extension group is cut through the cutting mechanism. And during specific cutting, the metal burrs after the side edge of the current collector extension part group is cut are less than or equal to 50 micrometers. Thereby make the side edge of the mass flow body extension group after the cutting satisfy the burr standard, make the mass flow body extension group satisfy the heat-seal glue and cover the standard, also reduce the influence of burr to sealed effect.
As an alternative, to further ensure that the current collector extension group meets the heat seal adhesive coating standard. When the current collector is cut, cutting a first arc-shaped transition angle at one end, close to the cell main body, of the side edge of the current collector extension part group; wherein, the first arc transition angle is an inward-concave arc angle. Specifically, the straight line cutting edge in the accessible side-cut subassembly cuts the side of collection fluidic extension group, and the first pitch arc cutting edge through the side cutter cuts collection fluidic extension group and collects the fluidic junction to form the arc transition, prevent the inside current collection extension group of electric core because of having the potential safety hazard that sharp closed angle exists. Reference may be made to the description of the sidecut component, which is not repeated herein.
As an alternative, when cutting the side edge, cutting a second arc-shaped transition angle connected with the first arc-shaped transition angle at one end of the side edge of the current collector extension group close to the cell main body; wherein, the second arc transition angle is a convex arc angle. Specifically, the side of the sharp sword cutting mass flow body extension group in the subassembly is cut to the accessible side, and the first pitch arc cutting edge and the second pitch arc cutting edge cutting mass flow body extension group and the mass flow body junction through the side-cutting to form the arc transition, prevent the inside mass flow body extension group of electric core because of having the potential safety hazard that sharp closed angle exists. Reference may be made to the description of the sidecut component, which is not repeated herein.
Step 003: applying sealant on the cut current collector extension group;
specifically, one side of the current collector extension group close to the current collector is pasted with a sealant, and the sealant is a heat sealing adhesive.
Step 004: and packaging the battery core, and packaging the region applied with the sealant on the current collector extension group through a packaging film.
Specifically, the current collector and the part of the current collector extension part applied with the sealant are wrapped by the packaging film through packaging equipment.
In the technical scheme, the cutting mechanism for cutting the side edge of the current collector extension part group keeps the two sides of the current collector extension part group flat, the current collector extension part group meets the preparation work of laminating tab glue, after the tab glue is laminated, the flat current collector extension part group can ensure that no leakage/seepage problem occurs between the tab glue and the current collector extension part group, and the qualified rate of the prepared finished battery can be ensured during further packaging with an aluminum plastic film.
As an alternative, after step 002, the top edge of the current collector extension group may be cut by the top cutting assembly to ensure the flatness of the top edge of the current collector extension group, so as to improve the flatness of the current collector extension group as a whole.
In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The present application has been described above in connection with preferred embodiments, which are intended to be exemplary only and illustrative only. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.
Claims (13)
1. A cutting mechanism, comprising: a clamping assembly for clamping and fixing the current collector extension group;
and a side cutter for cutting a side edge of the current collector extension group clamped and fixed by the clamping assembly in a first direction; wherein,
the first direction is a thickness direction of the current collector extension group.
2. The cutting mechanism of claim 1 wherein the clamping assembly is provided with a channel;
the side edge to be cut on the current collector extension group is exposed in the channel;
the side cutter is movable within the channel in a first direction.
3. The cutting mechanism as set forth in claim 2, wherein the number of said passages is two, and said two passages are spaced apart;
the number of the side cutters is one, one of the side cutters can move in one channel along the first direction, cutting edge structures are arranged on two sides of the side cutter, and the shapes of the cutting edge structures on the two sides are in mirror symmetry with the center line of the side cutter; or,
the number of the side cutters is two, the two side cutters can move in the two channels in the first direction in a one-to-one correspondence mode, the two side cutters are provided with cutting edge structures on the side faces, close to each other, of the two side cutters, and the shapes of the two cutting edge structures are in mirror symmetry with the center lines of the two side cutters.
4. The cutting mechanism of claim 3, wherein the clamping assembly comprises: the first pressing plate and the second pressing plate are oppositely arranged; wherein a space for accommodating the current collector extension group is formed between the first pressing plate and the second pressing plate;
and at least one of the first and second platens is movable relative to the other platen in the first direction.
5. The cutting mechanism of claim 4, wherein the first pressure plate is provided with a first through hole and the second pressure plate is provided with a second through hole; wherein,
the first through holes and the second through holes are arranged at intervals along the first direction;
an inner cavity between the first through hole and the second through hole is a part of the channel.
6. The cutting mechanism of claim 4, wherein the first pressure plate is provided with a first notch and the second pressure plate is provided with a second notch; wherein,
the first notches and the second notches are arranged at intervals along the first direction;
the space enclosed by the first notch and the second notch is a part of the channel.
7. The cutting mechanism as set forth in any one of claims 1 to 6, wherein the side cutter has a straight cutting edge and a first curved cutting edge connected to the straight cutting edge, the straight cutting edge and the first curved cutting edge being located at one end of the side cutter adjacent to the current collector; wherein,
the first arc line cutting edge is an arc line cutting edge with an arc line convex outwards.
8. The cutting mechanism of claim 7 wherein the side cutter further comprises a second curved cutting edge connected to the first curved cutting edge and the first curved cutting edge is located between the straight cutting edge and the second curved cutting edge;
the second arc line cutting edge is an arc line cutting edge with an arc line concave inwards.
9. The cutting mechanism of claim 6, further comprising a top cutting assembly;
the top cutting assembly comprises a first cutter and a second cutter which are oppositely arranged; the first cutter and the second cutter are used for respectively abutting against two opposite sides of the top edge of the current collector extension part group in a cutting state; wherein,
at least one of the first cutter and the second cutter can move along the first direction relative to the other cutter.
10. The method for packaging the battery cell is characterized by comprising the following steps of:
welding the current collector extension part group;
cutting the side edge of the welded current collector extension group;
applying sealant on the cut current collector extension group;
and packaging the battery core, and packaging the region applied with the sealant on the current collector extension group through a packaging film.
11. The method for packaging according to claim 10, wherein the cutting is performed on the side edges of the welded current collector extension group; the method specifically comprises the following steps:
and after the side edge of the current collector extension part group is cut, the metal burr is less than or equal to 50 mu m.
12. The method for packaging according to claim 11, wherein the cutting is performed on the side edges of the welded current collector extension group; further comprising:
cutting a first arc-shaped transition angle at one end, close to the cell main body, of the side edge of the current collector extension group; wherein,
the first arc transition angle is an inwards concave arc angle.
13. The method of packaging of claim 12, wherein the cutting is performed on the sides of the welded set of current collector extensions; further comprising:
cutting a second arc-shaped transition angle connected with the first arc-shaped transition angle at one end, close to the cell main body, of the side edge of the current collector extension group; wherein,
the second arc-shaped transition angle is an outward convex arc-shaped angle.
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| CN202211722872.XA CN115870560B (en) | 2022-12-30 | 2022-12-30 | Cutting mechanism and packaging method |
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| CN202211722872.XA CN115870560B (en) | 2022-12-30 | 2022-12-30 | Cutting mechanism and packaging method |
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