CN115870560B - Cutting mechanism and packaging method - Google Patents
Cutting mechanism and packaging method Download PDFInfo
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- CN115870560B CN115870560B CN202211722872.XA CN202211722872A CN115870560B CN 115870560 B CN115870560 B CN 115870560B CN 202211722872 A CN202211722872 A CN 202211722872A CN 115870560 B CN115870560 B CN 115870560B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 207
- 230000007246 mechanism Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004806 packaging method and process Methods 0.000 title claims description 16
- 238000003466 welding Methods 0.000 claims description 30
- 230000007704 transition Effects 0.000 claims description 23
- 238000003825 pressing Methods 0.000 claims description 22
- 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 5
- 229920006280 packaging film Polymers 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005538 encapsulation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 238000003475 lamination Methods 0.000 description 8
- 239000003292 glue Substances 0.000 description 7
- 239000011888 foil Substances 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 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
- 238000004880 explosion Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004804 winding 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
- 239000003792 electrolyte Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012797 qualification 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
- 239000011149 active material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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
Abstract
The application provides a cutting mechanism and encapsulation method, this cutting mechanism includes: a clamping assembly for clamping the set of stationary collector extensions; and a side cutter for cutting the side edge of the 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 the technical scheme, the current collector extension part group is clamped and fixed by the clamping assembly, and the current collector extension part group is cut by the side cutter, so that the stability of the current collector extension part group in cutting and the cutting effect are 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 pole piece outer leakage foil after lamination or winding of the traditional lithium battery cannot be completely overlapped, the left-right overlapping degree deviation of the traditional pole piece outer leakage foil is in the range of 0.5-1.5mm, the overlapping degree deviation is influenced by lamination/winding thickness, and after the upper side of the pole piece outer leakage foil is shaped, the overlapping deviation is more than half distance of lamination/winding thickness.
The solution of traditional lithium cell is that after shaping the upside of die-cut pole piece outer leakage foil, pre-welding, then cutting out the superposition deviation, guaranteeing the alignment degree at top, but for traditional lithium cell, the welding edge position is easy to appear the bad phenomenon such as rosin joint/frying welding, and the rosin joint can lead to the increase of battery internal resistance, and the frying welding can lead to the decline of tab electrolyte corrosion resistance, can lead to a series of unusual problems such as internal resistance increase, metal chip drop after long-time electrolyte soaks.
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 part group of a battery cell after welding.
In a first aspect, there is provided a cutting mechanism comprising: a clamping assembly for clamping the set of stationary collector extensions;
and a side cutter for cutting the side edge of the 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 the technical scheme, the current collector extension part group is clamped and fixed by the clamping assembly, and the current collector extension part group is cut by the side cutter, so that the stability of the current collector extension part group in cutting and the cutting effect are improved, the shape of the current collector extension part group is adjusted by the side cutting mode, and the safety of the battery core is improved or the tab processing technology is improved.
In a specific embodiment, the clamping assembly is provided with a channel;
the side edges to be cut on the current collector extension part group are exposed in the channel;
the side cutter is movable in a first direction within the channel.
In a specific embodiment, the number of the channels is two, and the two channels are arranged at intervals;
the number of the side cutters is one, the side cutters can alternatively move along the first direction in one channel, cutting edge structures are arranged on two sides of the side cutters, and the shapes of the cutting edge structures on the two sides are mirror symmetry with the midline of the side cutters; or alternatively, the first and second heat exchangers may be,
the number of the side cutters is two, the two side cutters can move in the two channels in a one-to-one correspondence manner along the first direction, the two side cutters are provided with cutting edge structures on the sides, which are close to each other, of the side cutters, and the shapes of the two cutting edge structures are in mirror symmetry with respect to the central line of the two side cutters.
In a specific embodiment, the clamping assembly comprises: the first pressing plate and the second pressing plate are oppositely arranged; wherein a space 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 platen and the second platen is movable in the first direction relative to the other platen.
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;
the 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 notch and the second notch 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 embodiment, the side cutter is provided with a linear cutting edge and a first arc cutting edge connected with the linear cutting edge, and the linear cutting edge and the first arc cutting edge are positioned at one end of the side cutter close to the current collector; wherein,
the first arc cutting edge is an arc cutting edge with an arc protruding outwards.
In a specific 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 cutting edge is an arc cutting edge with an arc concave.
In a specific embodiment, a roof-cutting assembly is also included;
the top cutting assembly comprises a first cutter and a second cutter which are oppositely arranged; wherein, in the state of cutting, the first cutter and the second cutter are used for respectively pressing against two opposite sides of the top edge of the current collector extension part group; 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 packaging a battery cell is provided, the method comprising the steps of:
welding the current collector extension part group;
cutting the side edges of the welded current collector extension part group;
applying sealant on the cut current collector extension part group;
and packaging the battery core, and packaging the area, to which the sealant is applied, on the current collector extension part group through a packaging film.
In a specific embodiment, the welded collector extension sets are cut on their sides; the method specifically comprises the following steps:
after cutting the sides of the collector extension group, the metal burrs were less than or equal to 50 μm.
In a specific embodiment, the welded collector extension sets are cut on their sides; further comprises:
cutting a first arc-shaped transition angle at one end, close to the battery core main body, of the side edge of the current collector extension part group; wherein,
the first arc-shaped transition angle is an inward concave arc-shaped angle.
In a specific embodiment, the welded collector extension sets are cut on their sides; further comprises:
cutting a second arc-shaped transition angle connected with the first arc-shaped transition angle at one end, close to the battery cell main body, of the side edge of the current collector extension part group; wherein,
the second arc transition angle is an outwards convex arc angle.
Drawings
Fig. 1 shows a schematic structural diagram of a battery cell according to an embodiment of the present application;
fig. 2 shows a schematic structural diagram of a battery cell package according to an embodiment of the present application;
fig. 3 illustrates a schematic view of current collector extension welding provided by an embodiment of the present application;
FIG. 4 shows a schematic structural view of a side-cutting assembly provided by an embodiment of the present application;
FIG. 5 illustrates a reference view of the use of the side cutting assembly provided by embodiments of the present application;
fig. 6 shows a schematic structural diagram of a side cutter according to an embodiment of the present application;
fig. 7 shows a schematic structural diagram of another side cutter according to an embodiment of the present application;
fig. 8 is a schematic structural view showing a current collector extension cut by the cutter at the other side according to the embodiment of the present application;
FIG. 9 shows a schematic structural view of a roof cutting assembly provided by an embodiment of the present application;
FIG. 10 illustrates a use state reference diagram of a roof cutting assembly provided by an embodiment of the present application;
fig. 11 shows a flow chart of a packaging method according to an embodiment of the present application.
Detailed Description
The present application is further described in detail below by way of 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 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. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
In order to facilitate understanding of the cutting mechanism provided by the embodiment of the application, an application scene of the cutting mechanism is first described. The cutting mechanism provided by the embodiment of the application is applied to cutting of the current collector extending part, wherein the current collector extending part is a part of the current collector extending out to serve as a tab or be used for connecting with an external tab. However, when the current collector is stacked or wound, the current collector extension portion is deviated after stacking, which results in various cases such as cold welding or explosion welding when welding the current collector extension portion. Therefore, the embodiment of the application provides a cutting mechanism for cutting the laminated current collector extension part, so that the welding effect is improved. The following detailed description is made with reference to the specific drawings and examples.
To facilitate an understanding of the cutting mechanism provided in the embodiments of the present application, a cut current collector extension thereof will be first described. Referring to fig. 1, a structure of a battery cell including a pole piece set and a current collector extension set 20 is illustrated in fig. 1. 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 pole pieces of the battery cells. When the electrode sheet group of the battery cell includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately laminated. Correspondingly, the current collector group comprises a positive current collector and a negative current collector, and the positive current collector and the negative current collector are alternately laminated.
When the lamination forms a battery cell, the positive plate and the negative plate are prepared by laminating equipment, and are isolated by a diaphragm, so that the electric isolation between the positive plate and the negative plate is realized, and the short circuit of the positive plate and the negative plate in the battery cell is avoided.
The current collector extension group 20 includes a plurality of current collector extensions 21 stacked and disposed, 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 collector extension 21 is a protrusion extending from the collector 10, that is, the protrusion is integrally formed with the collector 10. In forming the current collector extension group 20, a plurality of current collector extensions 21 are connected by metal bonding, thereby forming a unitary structure. For example, the metal bonding between the plurality of current collector extensions 21 may be formed by cold 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 an electrical conductor outside the battery, that is, the current collector extension group 20 is configured to be connected to the battery external circuit. Illustratively, when the battery is assembled, the current collector extension set 20 extends at least partially out of the battery package that is used to encase the pole pieces as described above when the battery includes the package.
When the battery includes a housing that houses the cells, the current collector extension set 20 extends at least partially outside the housing of the battery, with the portion of the current collector extension set 20 exposed outside the housing for connection with circuitry external to 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 to the external tab. At this time, when assembled, the current collector extension group 20 is located inside the case, and the tab is welded with the current collector extension group 20 and extends to the outside of the case to be connected to a circuit outside 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 of the current collector extension group 20 and the number of layers stacked are not limited herein, and the current collector extension group 20 may be configured as a structure other than the above example, which 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 unitary body. After welding, a sealant 30 is applied on the current collector extension set 20, and a packaging film 40 is packaged, wherein the packaging film 40 can be an aluminum plastic film, so as to complete the preparation of the battery cell. When the encapsulation film 40 encapsulates the current collector 10, the encapsulation film 40 applies the region of the sealant 30.
Referring to fig. 3, during welding, a portion of the unwelded area is left at the edge of the current collector extension set 20 in order to ensure the safety of the welding gun. At this time, the current collector extension 21 may be divided into a welded region 211, an unwelded region 213. The weld region 211 and the unwelded region 213 are distinguished by a dotted line. The cutting mechanism provided in the embodiment of the present application is used for cutting and trimming the edge of the current collector extension group 20, and the cut area is the region to be cut 212 shown in fig. 3. The following describes in detail the cutting mechanism provided in the embodiment of the present application with reference to specific drawings.
Referring to fig. 4, fig. 2 is 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 in the embodiments of the present application may include a side cutting assembly, where the main structure of the side cutting assembly includes two parts, namely, the clamping assembly 100 and the side cutter 200. Wherein the clamping assembly 100 is used to clamp and secure the set of current collector extensions and the side cutting blade 200 is used to cut the side edges of the set of current collector extensions clamped and secured by the clamping assembly 100 in a first direction.
Compared with the prior art, the upper side shaping of the current collector extension part group (namely the pole piece outer leakage foil) is performed, the two sides of the current collector extension part group are not processed, and the two sides of the current collector extension part group are cut off by using the side cutters, so that the tab manufacturing process and the tab structure are improved. The side cutters are used for cutting off the two sides of the pre-welded current collector extension part group, and the adverse phenomena of cold welding/explosion welding and the like at the welding edge position are eliminated or reduced. In addition, the shaping treatment is carried out on the two sides of the current collector extension part group, the edges of the two sides are neat and smooth, the rubberizing process is also convenient to carry out, and the packaging effect is ensured.
The following detailed description is to be taken in conjunction with the accompanying drawings.
The clamping assembly 100 provided in the embodiment of the 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 and 120 may be movable with respect to the other platen such that the first and second platens 110 and 120 may clamp the fixed current collector extension group.
Illustratively, in one possible embodiment, the second platen 120 is a fixed platen, the first platen 110 is a moving platen, and the direction of movement of the first platen 110 is along the first direction. When clamping the current collector extension group, the first pressing plate 110 is first moved in a direction away from the second pressing plate 120 such that a space therebetween increases.
Referring also to fig. 5, fig. 5 shows a schematic structural view of a cutting mechanism cutting a current collector extension group. In use of the cutting mechanism, the current collector extension set 20 is first placed on the second platen 120, after which the first platen 110 is moved toward the second platen 120 and the current collector extension set 20 is clamped between the first platen 110 and the second platen 120. Wherein the first platen 110 is driven by a driving mechanism. The drive mechanism may be, for example, a motor, a hydraulic cylinder or a pneumatic cylinder, among other linear drive mechanisms. It should be appreciated that the above-described drive mechanism may provide a compressive force with which the first platen 110 compresses the plurality of current collector extensions between the first platen 110 and the second platen 120 to secure the current collector extension groups 20.
In the present embodiment, the clamping assembly 100 is provided with a channel 130; the channels 130 are used to expose the sides of the current collector extension set to be cut (the areas 212 to be cut shown in fig. 3). Illustratively, the sides of the collector extension set that are to be cut may be exposed within the channel 130 when the clamping assembly 100 clamps the collector extension set in place. The side cutter 200 may move in the first direction within the channel 130 to cut the sides of the current collector extension set while the side cutter 200 cuts the sides of the current collector extension set.
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 sides of the current collector extension group. When the number of the channels 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 cutter 200 may alternatively move in the first direction in one of the channels 130. In a specific cut, the side cutter 200 may cut one side of the current collector extension group in one channel 130. After the cutting is completed, the side cutter 200 is again introduced into the other channel 130 to cut, so as to cut both sides of the current collector extension portion, respectively. In this case, the side cutters have cutting edge structures on both sides, and the shapes of the cutting edge structures on both sides are mirror-symmetrical with respect to the center line 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 a one-to-one correspondence. I.e., the two side cutters 200 may be inserted into the two channels 130, respectively, to perform cutting. In this case, both side cutters have cutting edge structures on their sides which are close to each other, the shape of both cutting edge structures being mirror-symmetrical with respect to the midline of both side cutters. Therefore, the side edge of the current collector extension part group can be cut through one-time cutting, and the cutting effect is improved.
As one example, where the clamping assembly 100 includes the first and second platens 110, 120 described above, the channels 130 may be formed in the first and second platens 110, 120 by different structures.
Illustratively, in one embodiment, the first platen 110 is provided with a first through hole 131 and the second platen 120 is provided with a second through hole 132; wherein the first through holes 131 and the second through holes 132 are arranged at intervals along the 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 respectively arranged at both sides of the stacking direction of the current collector extension group.
The first through hole 131, the second through hole 132, and the first through hole 131 and the second through hole 132 constitute 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 symmetry with respect to their own axes. The side cutter 200 is first inserted into the first through hole 131 when moving in the first direction in the channel 130, and cuts the side of the current collector extension group when the side cutter 200 continues to move in the first direction 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 to be cut of the current collector extension set is located in the first through hole 131 and the second through hole 132, that is, the vertical projection of the side to be cut along the first direction is located in the first through hole 131 and the second through hole 132, so that the side cutting blade 200 can cut the side to be cut of the current collector extension set when moving 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 to ensure stability in cutting.
As a modified structure, the channel 130 provided in the embodiments of the present application may also be formed by other structures. Illustratively, the first platen 110 is provided with a first notch, and the second platen 120 is provided with a second notch; the first notch and the second notch are arranged at intervals along the first direction; the lumen between the first and second notches is part of the channel 130. When the first notch and the second notch are specifically arranged, the first notch and the second notch can be long-waist-shaped holes, and the first notch and the second notch are oppositely arranged along the first direction and are respectively arranged at two sides of the stacking direction of the current collector extension part group.
The first notch, the second notch, and the first notch and the second notch form the channel 130. The side cutter 200 is preferably inserted into the first notch when moving in the first direction within the channel 130, and cuts the side of the current collector extension set when the side cutter 200 continues to move in the first direction and enters the second notch after cutting is completed.
It should be understood that when the first notch and the second notch are provided, the side to be cut of the current collector extension set should be ensured to be 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 set 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 can also be supported by the side wall of the notch to ensure the stability during cutting, which is not described herein.
The side cutter 200 may be moved in a first direction by the side cutter 200 to cut a plurality of collector extensions while cutting the collector extensions. When the side cutter 200 is driven to move, the side cutter 200 can be driven by a driving mechanism, wherein 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 reciprocating movement of the side cutter 200 in the first direction through expansion and contraction of the piston rod. It should be understood that the driving mechanism may be other linear driving mechanisms besides the hydraulic cylinder or the air cylinder, and is not specifically limited in the embodiments of the present application.
When the side cutter 200 specifically cuts the current collector extension part, the cut metal burrs are less than or equal to 50 μm, so that the side edges of the cut current collector extension part group meet the burr standard, and the current collector extension part group meets the heat seal glue coating standard.
The side cutter 200 according to the embodiment of the present application may employ side cutters 200 with different cutting edges, and will be described with reference to specific drawings.
Referring to fig. 6, fig. 6 shows a schematic structural view of the side cutter. The side cutter 200 provided in the embodiment of the present application has a linear cutting edge 210 and a first arc cutting edge 220 connected to the linear cutting edge 210, where the linear cutting edge 210 and the first arc cutting edge 220 are located at one end of the side cutter 200 near the current collector.
When the linear cutting edge 210 is specifically disposed, the longitudinal direction of the linear cutting edge 210 is along the longitudinal direction of the side edge of the current collector extension portion, and is disposed in parallel or approximately parallel to the longitudinal direction of the side edge. So that the straight cutting edge 210 can cut the sides of the current collector extension.
The first arcuate cutting edge 220 is a cutting edge that cuts the junction of the collector extension and the collector. When specifically provided, the first curved cutting edge 220 is a curved cutting edge with a convex curve. The arc cutting edge with the convex arc is directed towards the current collector extension part in the convex arc direction, and the first arc cutting edge 220 can form a concave fillet at the connection part of the current collector extension part and the current collector, so that the side edge of the current collector extension part group can be in arc transition with the current collector, and the point formed at the connection part of the current collector extension part group and the current collector is avoided, so that the current collector extension part group meets the heat seal glue covering standard; compared with the right-angle structure, the round corner structure is difficult to generate metal scraps, and internal short circuit phenomenon caused by the metal scraps is avoided. The side edge of the current collector extension part group adopts arc transition, so that potential safety hazards caused by sharp corners of the current collector extension part group in the battery core can be prevented, such as puncturing of an aluminum plastic film.
It should be appreciated that the straight cutting edge 210 and the first curved cutting edge 220 are rounded at their junction. It is understood that the straight cutting edge 210 is a tangent to the end of the first arcuate cutting edge 220 where the straight cutting edge 210 connects to ensure that the connection between the two cutting edges does not form a protrusion or depression of the tip at the edge of the collector extension set when 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, where the second curved cutting edge 230 is connected to the first curved cutting edge 220 and is located on a side of the first curved cutting edge 220 facing away from the straight cutting edge 210. That is, when disposed, 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 curved cutting edge 230 is a curved cutting edge with a concave curved surface. I.e., the concave direction of the second curved cutting edge 230, is oriented toward the current collector extension set so that a convex rounded transition is formed at the edge of the current collector extension set when the current collector extension set is cut. It should be appreciated that the arc transition is provided at the junction of the first curved cutting edge 220 and the second curved cutting edge 230, thereby avoiding sharp points at the junction therebetween, ensuring that the sides of the cut collector extension set are rounded sides, and avoiding sharp point protrusions 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 section of the straight cutting edge 210. The embodiment of the present application is not specifically limited.
As an alternative, the first arcuate cutting edge 220 may be a circular arcuate cutting edge to form rounded corners when cutting the collector extension set. In particular cutting the collector extension set, the first curved cutting edge 220 may be rounded at the 1-10mm cut edge of the collector extension set near the current collector. Such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, etc. As shown in fig. 8, the radius of the arc radian of the first arc-shaped transition angle 214 may be 1-10mm during cutting. By way of example, the radius may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, etc. of different radii.
Similarly, the second arc cutting edge 230 may also be an arc cutting edge, and the radius of the arc radian of the second arc transition angle 215 formed by cutting the second arc cutting edge may be 1-10 mm. By way of example, the radius may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, etc. of different radii.
As an alternative, after the side cutter of the cutting mechanism is used for cutting, the current collector extension part 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 pole piece group than the second width section. The height of the first width segment may be 1mm to 3mm, where the height refers to the distance between the top edge of the first width segment and the adjacent edge of the pole piece set. Therefore, the second arc cutting edge 230 may have a chamfer structure with a depth of 1mm to 3mm, or a rounded structure with a radius of 1mm to 3 mm.
Referring to fig. 9 and 10, fig. 9 shows a schematic structural diagram of a top cutting assembly, fig. 10 shows a reference diagram of a usage state of the top cutting assembly, and the cutting mechanism provided in the embodiment of the present application further includes a top cutting assembly 300; the edge cutting assembly is used for cutting the top edge of the current collector extension part group. The top edge refers to an edge of the current collector extension set facing away from the pole piece set.
The cutting mechanism in the present application includes not only a side cutter, but also a top cutter assembly. The shaping treatment can be carried out on both sides of the current collector extension part group, and the shaping treatment can be carried out on the upper side of the current collector extension part group, so that the bad phenomena of cold joint/explosion welding 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 electrode lug in the prior art, but also suitable for the process of using the current collector extension part group as the external electrode lug.
When specifically arranged, the top cutting assembly 300 comprises a first cutter 310 and a second cutter 320 which are oppositely arranged; wherein the first cutter 310 and the second cutter 320 are disposed opposite to each other in the first direction, and the cutting edges are opposite to each other. In particular use, the first and second cutters 310, 320 are configured to respectively abut against opposite sides of the top edge of the current collector extension set in a cutting state. And at least one of the first cutter 310 and the second cutter 320 is movable in a first direction with respect 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 cutter 310 is away from the second cutter 320, and a gap accommodating the current collector extension group is formed between the first cutter 310 and the second cutter 320. The collector extension set is placed on a second cutter 320. The first cutter 310 is driven to move toward the second cutter 320 and cut the top edge of the collector extension set during the movement. It should be understood that the driving mechanism of the first cutter 310 may be a motor, a hydraulic cylinder, or an air cylinder, and the specific connection manner is the same as that of the side cutter 200 and the driving mechanism, which is not described herein.
It should be understood that where the cutting mechanism includes side and top cutting assemblies 300, the top edges of the current collector extension sets may be cut by the top cutting assembly 300 before the side edges of the current collector extension sets are cut by the side cutting assembly. Alternatively, the side edges of the current collector extension parts may be cut by the side cutting assembly, and then the top edges of the current collector extension part groups may be cut by the bank edge cutting assembly. The above-mentioned different cutting modes can be applied to the embodiments of the present application.
In the above technical solution, the current collector extension group is clamped and fixed by the clamping assembly, and the current collector extension group is cut by the side cutter 200, so that the stability of the current collector extension group during cutting and the cutting effect are improved.
It can be seen from the above description that, by the cutting mechanism for cutting the side edge 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 the lamination tab adhesive, after the lamination tab adhesive, the flat current collector extension group can ensure that the problem of liquid leakage/seepage between the tab adhesive and the current collector extension group can not occur, and further, the qualification rate of the prepared finished battery can be ensured when the battery is packaged with an aluminum plastic film.
Referring to fig. 11, the embodiment of the 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 fabrication of the cells, the current collector extension set needs to be welded to form a whole. During welding, in order to ensure the safety of the welding gun, a part of non-welded area is left at the edge of the current collector extension part group. The edges (including the unwelded area and the partial welded area) of the current collector extension group are the edges to be cut.
In the case of specific welding, the welding may be performed by different welding methods, and by way of example, the welding may be performed by cold press welding or hot press welding.
Step 002: cutting the side edges of the welded current collector extension part group;
specifically, the sides of the current collector extension group are cut by a cutting mechanism. In the specific cutting, the metal burrs after the side cutting of the current collector extension part group are less than or equal to 50 mu m. Therefore, the side edges of the cut current collector extension part group meet the burr standard, the current collector extension part group meets the heat seal glue covering standard, and the influence of burrs on the sealing effect is reduced.
As an alternative, to further ensure that the current collector extension set meets the heat seal glue lamination criteria. When the current collector is cut, a first arc-shaped transition angle is cut at one end, close to the battery core main body, of the side edge of the current collector extension part group; the first arc-shaped transition angle is an inward concave arc-shaped angle. Specifically, the side edge of the current collector extension part group can be cut through the straight line cutting edge in the side cutting assembly, and the junction of the current collector extension part group and the current collector is cut through the first arc cutting edge of the side cutting blade, so that arc transition is formed, and potential safety hazards caused by sharp corners of the current collector extension part group inside the battery core are prevented. Reference is made in particular to the relevant description of the side cutting assembly, which is not repeated here.
As an alternative, when cutting the side edge, it may further include cutting a second arc-shaped transition angle connected to the first arc-shaped transition angle at an end of the side edge of the current collector extension group near the cell main body; wherein the second arc transition angle is an outwards convex arc angle. Specifically, the side edge of the current collector extension part group can be cut by the straight line cutting edge in the side cutting assembly, and the junction of the current collector extension part group and the current collector is cut by the first arc cutting edge and the second arc cutting edge of the side cutting blade, so that arc transition is formed, and potential safety hazards caused by sharp corners of the current collector extension part group in the battery core are prevented. Reference is made in particular to the relevant description of the side cutting assembly, which is not repeated here.
Step 003: applying sealant on the cut current collector extension part group;
specifically, a sealant is applied to one side of the current collector extension group, which is close to the current collector, and the sealant is a heat seal adhesive.
Step 004: and packaging the battery core, and packaging the area on which the sealant is applied on the current collector extension part group through the packaging film.
Specifically, the encapsulation film is wrapped around the current collector and the portion of the current collector extension to which the sealant is applied by the encapsulation device.
In the technical scheme, through the cutting mechanism for cutting the side edges of the current collector extension part group, the two sides of the current collector extension part group are kept smooth, the current collector extension part group meets the preparation work of the lamination tab glue, after the tab glue is laminated, the smooth current collector extension part group can ensure that the problem of liquid leakage/seepage between the tab glue and the current collector extension part group can not occur, and further, when the current collector extension part group is packaged with an aluminum plastic film, the qualification rate of preparing a finished battery can be ensured.
As an alternative, after step 002, the top edge of the current collector extension set may be further cut by a top cutting assembly to ensure the flatness of the top edge of the current collector extension set, so as to improve the flatness of the overall current collector extension set.
In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly specified and limited otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The present application has been described in connection with the preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On the basis of this, many alternatives and improvements can be made to the present application, which fall within the scope of protection of the present application.
Claims (7)
1. A cutting mechanism, comprising: a clamping assembly for clamping the set of stationary collector extensions;
and a side cutter for cutting the side edge of the collector extension group clamped and fixed by the clamping assembly in a first direction; the side cutter is provided with a linear cutting edge, a first arc cutting edge connected with the linear cutting edge and a second arc cutting edge connected with the first arc cutting edge, and the linear cutting edge and the first arc cutting edge are positioned at one end of the side cutter, which is close to the current collector; the first arc cutting edge is positioned between the linear cutting edge and the second arc cutting edge; the first arc cutting edge is an arc cutting edge with an arc protruding outwards, and the second arc cutting edge is an arc cutting edge with an arc recessed inwards; wherein the first direction is a thickness direction of the current collector extension group;
the clamping assembly is provided with a channel; the number of the channels is two, and the two channels are arranged at intervals; the side edges to be cut on the current collector extension part group are exposed in the channel; the side cutter is movable in a first direction within the channel;
the number of the side cutters is two, the two side cutters can move in the two channels in a one-to-one correspondence manner along the first direction, the two side cutters are provided with cutting edge structures on the sides, which are close to each other, of the side cutters, and the shapes of the two cutting edge structures are in mirror symmetry with respect to the central line of the two side cutters.
2. The cutting mechanism of claim 1, wherein the clamping assembly comprises: the first pressing plate and the second pressing plate are oppositely arranged; wherein a space 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 platen and the second platen is movable in the first direction relative to the other platen.
3. The cutting mechanism of claim 2, wherein the first platen is provided with a first through hole and the second platen 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;
the inner cavity between the first through hole and the second through hole is a part of the channel.
4. The cutting mechanism of claim 2, wherein the first platen is provided with a first notch and the second platen is provided with a second notch; wherein,
the first notch and the second notch 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.
5. The cutting mechanism of claim 4, further comprising a top cutting assembly;
the top cutting assembly comprises a first cutter and a second cutter which are oppositely arranged; wherein, in the state of cutting, the first cutter and the second cutter are used for respectively pressing against two opposite sides of the top edge of the current collector extension part group; wherein,
at least one of the first cutter and the second cutter can move along the first direction relative to the other cutter.
6. The packaging method of the battery cell is characterized by comprising the following steps of:
welding the current collector extension part group;
cutting the side edges of the welded current collector extension set by the cutting mechanism of claim 1;
applying sealant on the cut current collector extension part group;
packaging the battery core, and packaging the area on which the sealant is applied on the current collector extension part group through a packaging film;
the cutting of the side edges of the welded current collector extension group comprises:
cutting a first arc-shaped transition angle at one end, close to the battery core main body, of the side edge of the current collector extension part group; cutting a second arc-shaped transition angle connected with the first arc-shaped transition angle at one end, close to the battery cell main body, of the side edge of the current collector extension part group; the first arc-shaped transition angle is a concave arc-shaped angle, and the second arc-shaped transition angle is a convex arc-shaped angle.
7. The method of packaging of claim 6, wherein the side edges of the welded current collector extension sets are cut; the method specifically comprises the following steps:
after cutting the sides of the collector extension group, the metal burrs were less than or equal to 50 μm.
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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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