CN217569429U - Coating gasket, die head, pole piece material belt and battery - Google Patents
Coating gasket, die head, pole piece material belt and battery Download PDFInfo
- Publication number
- CN217569429U CN217569429U CN202220637191.2U CN202220637191U CN217569429U CN 217569429 U CN217569429 U CN 217569429U CN 202220637191 U CN202220637191 U CN 202220637191U CN 217569429 U CN217569429 U CN 217569429U
- Authority
- CN
- China
- Prior art keywords
- coating
- flow blocking
- area
- pole piece
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
Abstract
The utility model relates to a battery processing part technical field, concretely relates to coating gasket, die head, pole piece material area and battery. The coated gasket comprises: a connecting portion; the flow blocking parts are arranged at two ends of the connecting part along the length direction; the supporting part is arranged between the flow blocking parts at the two ends along the length direction and is connected with the flow blocking part at least one end, and the thickness of the supporting part is smaller than that of the flow blocking part; the bulge part is arranged on the supporting part and is arranged at intervals with the flow blocking part, and the sum of the thicknesses of the bulge part and the supporting part is less than the thickness of the flow blocking part; the front ends of the flow blocking part, the supporting part and the protruding part along the coating direction are flush. The utility model provides a different regions on the pole piece that the coating pad processed out have different thickness, can be for pole piece inflation headspace to reduce the influence of expansive force.
Description
Technical Field
The utility model relates to a battery processing technical field, concretely relates to coating gasket, die head, pole piece material area and battery.
Background
During the charging and discharging process of the battery, lithium ions are continuously extracted from and inserted into the pole piece, so that the volume of the battery can show a certain proportion of expansion change, and the battery generates a certain expansion force. The swelling force not only deteriorates the safety of the battery, but also deteriorates the life of the battery. For the laminated battery, the degree of freedom of the edge part of the pole piece is high, and a certain degree of force can be released in the length direction or the width direction, but the middle part of the pole piece can only release the force in the thickness direction (namely the lamination direction of the pole piece), meanwhile, due to the limitation of the battery shell, the pole pieces are mutually extruded by the reaction force from the battery shell, the transmission of lithium ions is limited, the internal impedance of the battery is increased, and the attenuation of the battery capacity is accelerated; the middle part of the pole piece with smaller degree of freedom is subjected to larger reaction force and more serious extrusion, the pole piece is generally prepared by adopting a slit extrusion type coating technology in the prior art, slurry is sprayed out along a slit of a die and transferred onto a foil, the thickness of the slurry sprayed out from the slit is determined by the thickness of a coating gasket arranged in the slit, the thickness of the coating gasket in different positions of the pole piece in the prior art is the same, the thickness of the slurry coated at different positions of the foil is the same, the surface of the pole piece is flat, therefore, when a pole group is extruded due to expansion force, electrolyte at the middle part of the pole group with more serious deformation can be extruded, when free electrolyte in a shell cannot be timely supplemented to the middle of the pole group, ion channels are lost, lithium precipitation occurs, and potential safety hazards are generated, so that a coating gasket is urgently needed to be designed, and the pole piece and the battery which are influenced by the expansion force can be processed.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the great defect of the expansibility that pole piece equipment fashioned battery produced behind the lamination process among the prior art to a coating gasket that can process the pole piece that reduces the expansibility influence is provided.
The utility model discloses another technical problem that solves lies in overcoming the great defect of pole piece receives the expansibility influence that prior art die head processed out to a can process out the die head that reduces the pole piece that the expansibility influences is provided.
The utility model discloses another technical problem that solves lies in overcoming the great defect of pole piece receives the expansibility influence among the prior art to a pole piece material area that can reduce the expansibility influence is provided.
The utility model discloses another technical problem who solves lies in overcoming among the prior art battery and is influenced great defect by the bulging force to a battery that can reduce the bulging force influence is provided.
In order to solve the above technical problem, the utility model provides a pair of coating gasket, include:
a connecting portion;
the flow blocking parts are arranged at two ends of the connecting part along the length direction;
the supporting part is arranged between the flow blocking parts at two ends along the length direction and is connected with the flow blocking part at least one end, and the thickness of the supporting part is smaller than that of the flow blocking part;
the bulge part is arranged on the supporting part and is arranged at an interval with the flow blocking part, and the sum of the thicknesses of the bulge part and the supporting part is less than the thickness of the flow blocking part;
the flow blocking part, the supporting part and the protruding part are flush with each other along the front end of the coating direction.
Optionally, a flow guiding area is formed between the flow blocking portion and the connecting portion, the flow guiding area is suitable for accommodating external slurry, a flow guiding groove is formed at one end of the flow guiding area, which is far away from the connecting portion, and is suitable for guiding the slurry, and the supporting portion is arranged in the flow guiding groove.
Optionally, the coating shim further comprises: the reposition of redundant personnel portion, with connecting portion link to each other, the reposition of redundant personnel portion with it is located to keep off the position of flowing with one side of connecting portion, just the reposition of redundant personnel portion is located two keep off between the flow portion, the reposition of redundant personnel portion with it sets up to keep off the flow portion interval, the reposition of redundant personnel portion is kept away from the one end of connecting portion with it keeps away from to keep off the flow portion the one end of connecting portion flushes.
Optionally, two ends of the supporting portion are respectively connected to the flow blocking portion and the flow dividing portion, and the supporting portion, the connecting portion, the flow blocking portion and the flow dividing portion surround to form the flow guiding area.
Optionally, the cross section of the protrusion is rectangular, and the extending direction of the protrusion is parallel to the coating direction.
The utility model provides a die head, include:
the upper die head and the lower die head are arranged oppositely;
and the coating gasket is arranged between the upper die head and the lower die head and is abutted against the upper die head and the lower die head.
The utility model provides a pole piece material area, include:
a foil material;
a coating zone coated on the foil using the die described above.
Optionally, the coating zone comprises: a first painted area and a second painted area, the second painted area having a thickness less than the thickness of the first painted area.
Optionally, the width L1 of the second coating area and the width L2 of the coating area satisfy L1: L2= (2% -40%): 1; the thickness L5 of the second coating area and the thickness L5 of the first coating area meet the condition that L5: L6= (1% -30%): 1.
The utility model provides a battery, include: the pole piece material belt is cut into pole pieces.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a coating gasket, through connecting portion both ends keep off and set up between the class portion the supporting part, and set up the bellying on the supporting part, and the bellying with the thickness sum of supporting part is less than keep off the thickness of class portion, realize both ends keep off the region between the class portion and can hold thick liquids thickness and follow connecting portion length direction has the difference to different regions on the pole piece that the coating gasket that uses this embodiment to provide processed out have different thickness, can be for the pole piece inflation headspace, thereby reduce the influence of expansive force.
2. The utility model provides a coating gasket, through setting up the drainage area that is formed between fender class portion and the connecting portion, realize that the drainage area holds outside thick liquids, and provide the direction for the thick liquids via the guiding gutter of the guiding area one end department of keeping away from the connecting portion, realize deriving the thick liquids; and through setting up the supporting part is in the guiding gutter, realize being located on the supporting part the bellying also is located in the guiding gutter to avoided with the outside discharge gate that the drainage district corresponds to be connected, thereby guaranteed the smoothness nature that thick liquids flow, improve machining efficiency.
3. The utility model provides a coating gasket is two through setting up set up reposition of redundant personnel portion between the fender flow portion, just reposition of redundant personnel portion with fender flow portion interval sets up, realizes via reposition of redundant personnel portion will two the region between the fender flow portion divides into at least two parts to realize two or multiseriate coating, effectively improve machining efficiency.
4. The utility model provides a pole piece material area installs through using the die head of coating gasket comes the coating district to form the coating district that has different thickness, obtain the pole piece material area of different thickness coatings, thereby work as the pole piece material area is through processing and using in the battery, can provide the headspace for the inflation change of pole piece, realizes improving the purpose that the expansive force influences.
5. The battery provided by the utility model reserves a certain expansion space for the negative plate by using the pole plate processed by the coating gasket, thereby effectively reducing the deformation degree of the whole battery in thickness; a larger N/P ratio is provided for the middle area of the battery, and the lithium precipitation of the negative electrode is avoided; meanwhile, a channel for storing the electrolyte is reserved in the middle area of the battery, and the electrolyte can be supplemented in time, so that lithium precipitation caused by insufficient electrolyte is avoided, and the safety of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a coated gasket prior to modification;
FIG. 2 is a schematic structural view of an improved coated gasket;
FIG. 3 is a perspective view of the structure of part A of FIG. 2;
FIG. 4 is a schematic view of a pole piece strip manufactured using an improved coating shim;
FIG. 5 is a cross-sectional view of a pole piece web processed using a modified coated shim;
FIG. 6 is a schematic structural view of a pole piece fabricated using the modified coated shim;
FIG. 7 is a graph showing the results of a battery cycle performance test before and after modification;
FIG. 8 is a graph of surface pressure distribution at the end of a battery cycle before modification;
fig. 9 is a surface pressure distribution diagram at the end of the battery cycle after modification.
Description of reference numerals:
1. coating a gasket; 11. a connecting portion; 12. a flow blocking part; 13. a support portion; 14. a boss portion; 15. a flow dividing section; 16. mounting holes; 17. a diversion area; 18. a diversion trench; 2. pole piece material belt; 21. a coating area; 211. a first coating zone; 212. a second coating zone; 22. a region of empty foil; 23. dividing a tangent line; 3. a foil material; 4. pole pieces; 41. and (7) a tab.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1 to 9, the coating pad provided in this embodiment includes:
a connecting portion 11;
the supporting part 13 is arranged between the flow blocking parts 12 at two ends along the length direction, and is connected with the flow blocking part 12 at least one end, and the thickness of the supporting part 13 is smaller than that of the flow blocking part 12;
the bulge part 14 is arranged on the supporting part 13 and is arranged at an interval with the flow blocking part 12, and the sum of the thicknesses of the bulge part 14 and the supporting part 13 is less than the thickness of the flow blocking part 12;
the flow blocking portion 12, the support portion 13, and the protrusion portion 14 are flush with each other at the front end in the coating direction.
It should be noted that the length direction refers to a "length direction" indicated by an arrow in fig. 2; the thickness of the flow blocking part 12 is the same as that of the connecting part 11; the two ends of the connecting part 11 along the length direction are respectively provided with one flow blocking part 12, that is, the coating gasket is provided with two flow blocking parts 12, the connection of the supporting part 13 and the flow blocking part 12 at least one end means that the supporting part 13 can be connected with one of the flow blocking parts 12 at the two ends of the connecting part 11, or the two ends of the supporting part 13 are respectively connected with the flow blocking parts 12 at the two ends of the connecting part 11; the thickness refers to the dimension in the "thickness direction" indicated by the arrow in fig. 3; the front end of the coating direction refers to a direction indicated by an arrow of the "coating direction" shown in fig. 2; the coating gasket is a part of a processing tool used in the process of processing a pole piece material belt of a battery, the coating gasket is arranged between an upper die head and a lower die head of a die head for spraying pole piece slurry, so that a gap is formed between the upper die head and the lower die head, the slurry is extruded out of the die head from the gap, and therefore the thickness of the coating gasket directly determines the thickness of the slurry extruded from the die head, namely the thickness of an active material layer on a pole piece; the thickness of the flow blocking part 12 is recorded as H 12 The thickness of the supporting part 13 is H 13 The thickness of the convex part 14 is H 14 Then places at both endsThe thickness H of the area between the flow blocking parts 12 is the thickness H which can contain the slurry only at the corresponding position of the supporting part 13 12 -H 13 The thickness of the corresponding position of the supporting part 13 provided with the convex part 14 can contain the slurry is H 12 -H 13 -H 14 The thickness that realizes different positions and can hold the thick liquids is different to the correspondence can obtain the pole piece that has the active material layer of different thickness, thereby realize providing the headspace for the inflation change of pole piece, realize improving the mesh that the expansive force influences.
Alternatively, the connecting portion 11, the flow blocking portion 12, the supporting portion 13, and the protruding portion 14 are integrally formed.
Optionally, the thickness H of the flow baffle 12 12 A thickness H of the support part 13 13 Thickness H of the projection 14 14 Satisfies the relation: h 12 ＞H 14 ＞H 13 。
Optionally, the thickness H of the flow baffling part 12 12 And the thickness H of the support part 13 13 Is 0.4-4.0 mm, the thickness H of the convex part 14 14 The value range is 0.01-0.8 mm.
The thickness H of the flow blocking portion 12 12 A thickness H of the support part 13 13 Thickness H of the projection 14 14 The adjustment is made according to the flow rate of the slurry. When the coating gasket in the prior art is used for coating the positive plate, the thickness of the gasket and the flow rate of slurry satisfy the relation: (positive electrode area density coating width coating speed)/slurry solid content/slurry density = slurry flow rate gasket thickness slurry outlet width, when the coated gasket provided in this example was used, the above-described relation was still satisfied, but "gasket thickness slurry outlet width" in the formula was (H) indicated 12 -H 13 ) Thickness of (H) 12 -H 13 ) At the corresponding slurry outlet width + (H) 12 -H 14 )*(H 12 -H 14 ) The width of the corresponding slurry outlet, wherein the surface density of the anode is 8-25 mg/cm 2 Coating width of 100-300 mm, coating speed of 6-70 m/min, and solid content of positive electrode slurryThe amount is 65-80%, and the density of the slurry is 1.5-3 m 3 The thickness of the gasket is 0.5-2 mm, the width of the slurry outlet is 100-300mm, and N/P = 1.02-1.4.
The coating gasket provided by the embodiment is characterized in that the supporting parts 13 are arranged between the flow blocking parts 12 at the two ends of the connecting part 11, the protruding parts 14 are arranged on the supporting parts 13, and the sum of the thicknesses of the protruding parts 14 and the supporting parts 13 is smaller than that of the flow blocking parts 12, so that the areas between the flow blocking parts 12 at the two ends can contain the difference of the thickness of the slurry along the length direction of the connecting part 11, different areas on the pole piece processed by using the coating gasket provided by the embodiment have different thicknesses, a space can be reserved for the expansion of the pole piece, and the influence of the expansion force is reduced.
Specifically, a flow guiding area 17 is formed between the flow blocking portion 12 and the connecting portion 11, the flow guiding area 17 is adapted to accommodate external slurry, an end of the flow guiding area 17 away from the connecting portion 11 is a flow guiding groove 18, the flow guiding groove 18 is adapted to provide guidance for the slurry, and the supporting portion 13 is disposed in the flow guiding groove 18.
It should be noted that the guiding area 17 is communicated with a discharging hole of the die, the slurry enters the guiding area 17 from the discharging hole of the die, and then flows out through the guiding groove 18 to coat the slurry on the external structure, the supporting portion 13 is disposed in the guiding groove 18, so that the protrusion 14 disposed on the supporting portion 13 is also located in the guiding groove 18, thereby ensuring that the thickness of the slurry in the guiding groove 18 is changed, and at the same time, the position in the guiding area 17 corresponding to the discharging hole is avoided, and ensuring the smoothness of the flow of the slurry from the guiding area 17.
In the coating gasket provided by this embodiment, by providing the drainage area 17 formed between the flow blocking portion 12 and the connecting portion 11, the drainage area 17 is configured to accommodate external slurry, and guide the slurry through the guiding groove 18 at one end of the drainage area 17 far from the connecting portion 11, so as to guide the slurry; and the supporting part 13 is arranged in the diversion trench 18, so that the bulge part 14 on the supporting part 13 is also positioned in the diversion trench 18, thereby avoiding an external discharge hole correspondingly connected with the diversion region 17, ensuring the flowing fluency of the slurry and improving the processing efficiency.
Specifically, the coated gasket further comprises: shunt portion 15, with connecting portion 11 links to each other, shunt portion 15 with it is located to keep off class portion 12 connecting portion 11 same one side, just shunt portion 15 is located two keep off between class portion 12, shunt portion 15 with it sets up to keep off class portion 12 interval, shunt portion 15 keeps away from connecting portion 11 one end with it keeps away from to keep off class portion 12 the one end of connecting portion 11 flushes.
The division part 15 and the flow blocking part 12 are arranged at an interval, which means that the division part 15 is not connected to the flow blocking part 12, and at this time, one end of the support part 13 in the length direction is connected to the flow blocking part 12, and the other end is connected to the division part 15; the flow dividing portion 15 is flush with the connecting portion 11, the flow blocking portion 12, and the supporting portion 13 at one end surface in the thickness direction.
Optionally, the connecting portion 11, the flow blocking portion 12, the supporting portion 13, the protruding portion 14, and the flow dividing portion 15 are integrally formed.
Optionally, the flow dividing portion 15 extends along the coating direction, and further optionally, the extending direction of the flow dividing portion 15 is parallel to the coating direction, wherein the coating direction refers to a "coating direction" indicated by an arrow in fig. 2.
Optionally, the number of the flow dividing portions 15 is at least one, and when the number of the flow dividing portions 15 is one, one flow dividing portion 15 is located at the right middle position between two flow blocking portions 12, at this time, two rows of coating can be simultaneously realized by the coating gasket, that is, the pole pieces including two rows of coating areas are simultaneously obtained by coating; when the number of the shunt parts 15 is two, three rows of coating can be simultaneously realized by the coating pad; in the same way, the number of the shunting parts 15 can be multiple, and multiple rows of coating can be simultaneously realized by the coating gasket, so that the processing efficiency is improved.
Optionally, the diversion trench 18 is disposed at two ends of the length direction, and the front ends of the diversion part 15 and the flow blocking part 12 along the coating direction are set to be chamfers, so that slurry can be scraped when flowing out of the diversion trench 18, and the stability of the slurry coating on the external structure is improved.
The coating gasket provided by the embodiment is provided with the flow dividing part 15 between the two flow blocking parts 12, and the flow dividing part 15 and the flow blocking parts 12 are arranged at intervals, so that the two areas between the two flow blocking parts 12 are divided into at least two parts by the flow dividing part 15, two or more rows of coatings are realized, and the processing efficiency is effectively improved.
Specifically, two ends of the supporting portion 13 are respectively connected to the flow blocking portion 12 and the flow dividing portion 15, and the flow guiding area 17 is formed by the supporting portion 13, the connecting portion 11, the flow blocking portion 12 and the flow dividing portion 15 in a surrounding manner.
Specifically, the cross section of the projection 14 is rectangular, and the extending direction of the projection 14 is parallel to the coating direction.
Optionally, the number of the convex portions 14 is at least one. When the flow dividing part 15 is not arranged between the two flow blocking parts 12, the number of the convex parts 14 is at least one; when one flow dividing part 15 is arranged between two flow blocking parts 12, the number of the convex parts 14 is at least two, and at least one convex part 14 is arranged between one flow dividing part 15 and one flow blocking part 12; similarly, the coating pad is provided with at least one convex part 14 corresponding to the area for coating each column.
Example two
This embodiment provides a die head, includes:
the upper die head and the lower die head are arranged oppositely;
and the coating gasket 1, wherein the coating gasket 1 is arranged between the upper die head and the lower die head and is abutted against the upper die head and the lower die head.
Optionally, the coating gasket 1 is further provided with a mounting hole 16, the mounting hole 16 is disposed on the connecting portion 11 and/or the flow blocking portion 12, and the coating gasket 1 is mounted on the upper die and the lower die through the mounting hole 16.
The upper die head and the lower die head are two parts constituting the die head, the opposite surfaces of the upper die head and the lower die head are both flat surfaces, the coating gasket 1 is clamped between the upper die head and the lower die head so as to form a gap between the upper die head and the lower die head, the upper die head and/or the lower die head is communicated with a container for containing slurry, the upper die head and/or the lower die head is provided with a discharge hole, the discharge hole is arranged corresponding to the drainage region 17 of the coating gasket 1, the slurry enters the drainage region 17 through the discharge hole and then is guided through the diversion trench 18 so as to flow out from the gap between the upper die head and the lower die head, so that the slurry is coated on an external structure, wherein the external structure can be a foil material for manufacturing a battery pole piece.
EXAMPLE III
With reference to fig. 4 to fig. 6, the present embodiment provides a pole piece material strap, including:
a foil 3;
a coating zone 21, said coating zone 21 being applied to said foil 3 using said die as described above.
The pole piece material belt provided by the embodiment coats the coating area 21 by using the die head provided with the coating gasket provided by the embodiment I, so that the coating area 21 with different thicknesses is formed, and the pole piece material belt coated with coatings with different thicknesses is obtained.
Optionally, the coating area 21 is a positive coating. When the coating area 21 is a positive coating, the positive plate is obtained by further processing the pole piece material belt provided by the embodiment.
Specifically, the coating material region 21 includes: a first painted area 211 and a second painted area 212, the second painted area 212 having a thickness smaller than the thickness of the first painted area 211.
It should be noted that, with reference to fig. 2 and 4, one flow dividing portion 15 is disposed between two flow blocking portions 12 in fig. 2, two protruding portions 14 are disposed between the flow dividing portion 15 and one flow blocking portion 12, and accordingly, the pole piece material strip 2 shown in fig. 4 is obtained by using a die head mounted with the coating pad 1 shown in fig. 2, a length direction of the coating pad 1 corresponds to a strip width direction of the pole piece material strip 2, the die head and the foil 3 move relatively along the strip length direction, and slurry is coated on the foil 3 through the die head to form the pole piece material strip 2, where the strip width direction refers to a "strip width direction" indicated by an arrow in fig. 4; the length direction of the material belt refers to the length direction of the material belt indicated by an arrow in fig. 4; different structures on coating gasket 1 correspond and process out different regions on pole piece material area 2, wherein, the fender class portion 12 at coating gasket 1's both ends corresponds respectively pole piece material area 2 is followed the empty foil district 22 at material area width direction both ends, coating gasket 1's reposition of redundant personnel portion 15 corresponds pole piece material area 2 is followed the empty foil district 22 in the middle of material area width direction, coating gasket 1's bellying 14 corresponds the second coating district 212 of pole piece material area 2, coating gasket 1 only is provided with the position of supporting part 13 corresponds the first coating district 211 of pole piece material area 2, wherein, empty foil district 22 is in only foil material 3 and the region that does not have the thick liquids coating on pole piece material area 2. The pole piece material belt 2 in fig. 4 is followed a tangent line 23 in the positive centre of material belt width direction cuts the material belt that obtains the single-row coating shown in fig. 5, continues to cut along the tangent line 23 in fig. 5 and obtains the material belt that the material belt width is L2, then follows the material belt length direction cuts and obtains the pole piece 4 that the length shown in fig. 6 is L3 promptly, pole piece 4 includes that the width is coating district 21 and utmost point ear 41 of L2, utmost point ear 41 by empty foil district 22 in the pole piece material belt 2 cuts and forms.
As a modification, one of the protrusions 14 is provided between the diversion portion 15 and one of the flow blocking portions 12, and in this case, the distance between the diversion portion 15 and one of the flow blocking portions 12 is the width of a single-line coating tape.
Optionally, a distance L4 from one end of the tab 41 away from the painted area 21 to the painted area 21 is smaller than or equal to a dimension of the empty foil area 22 in the width direction of the material tape.
Specifically, the width L1 of the second coating zone 212 and the width L2 of the coating zone 21 satisfy L1: L2= (2% -40%): 1; the thickness L5 of the second coating area 212 and the thickness L5 of the first coating area 211 satisfy L5: L6= (1% -30%): 1.
It should be noted that when the range values of L1: L2= (2% -40%): 1 and L5: L6= (1% -30%): 1 are adopted, the battery assembled by the pole pieces 4 can ensure that enough space is reserved for the expansion of the pole pieces, and the capacity of the battery cannot be reduced due to too few coating layers.
Example four
As shown in fig. 1 to 9, the present embodiment provides a battery including:
the pole piece material belt is cut into the pole pieces 4.
Optionally, the pole piece 4 is a positive pole piece, the battery further includes a negative pole piece and a diaphragm, and the negative pole piece is a pole piece with a flat surface and commonly used pole pieces.
It should be noted that, during the cyclic charge and discharge process of the battery, the expansion deformation of the middle part of the battery in the thickness direction of the battery is more obvious, and especially the expansion deformation degree of the negative plate is more severe, and the thickness of the coating of the middle area of the positive plate in the width direction is smaller than that of the edge part, so that the battery provided by this embodiment has a larger space in the middle area in the width direction of the positive plate than in the edge area, and thus the battery provided by this embodiment reserves a certain expansion space for the negative plate to reduce the deformation degree of the whole battery in thickness; on the other hand, because the thickness of the coating layer in the middle area of the positive plate is smaller than that in the edge area, compared with the edge area of the battery, the N/P ratio (namely the ratio of the negative electrode active substance to the positive electrode active substance) in the middle area is larger, so that the sufficiency of the negative electrode material is ensured, and the lithium precipitation of the negative electrode is avoided; and, the coating thickness of the middle area of the positive plate is smaller than the coating thickness of the edge part, a channel for storing electrolyte can be reserved for the middle area of the battery, and the electrolyte can be supplemented in time, so that lithium precipitation caused by insufficient electrolyte is avoided, and the safety of the battery is improved, wherein the width direction of the positive plate is the same as the width direction of the material belt of the pole piece material belt 2.
The coating gasket provided by the first embodiment is simple in structure, the operation of processing the pole piece material belt by using the die head provided by the second embodiment is convenient, the pole piece material belt provided by the third embodiment and the battery provided by the fourth embodiment are easy to obtain, the complexity of a battery system cannot be increased, and the industrialization is easy to realize.
The battery provided in this example was compared with the battery of the comparative example (prior art) in the charge-discharge cycle test, and the cycle number of the battery, the capacity retention rate of the battery after the end of the cycle of each week, and the maximum swelling force and the minimum swelling force on the surface of the battery were recorded, and when the battery capacity had decayed to 85% or less, the cycle test on the battery was stopped, and the test results were plotted in table one, and the swelling force cycle comparison graph shown in fig. 7 was obtained by plotting the data in table one.
Table one cycle performance test results
With reference to fig. 7, the abscissa is the number of cycles of charging and discharging of the battery, and the two ordinates are the capacity retention rate and the swelling force of the battery during the cycle, respectively, in which six data lines are shown, where the capacity retention rate a1 represents the capacity retention rate variation trend of the battery provided in this embodiment during the cycle, the capacity retention rate b1 represents the capacity retention rate variation trend of the battery provided in the comparative example during the cycle, the maximum swelling force a2 represents the maximum swelling force variation trend of the battery surface of the battery provided in this embodiment during the cycle, the maximum swelling force b2 represents the maximum swelling force variation trend of the battery surface of the battery provided in the comparative example during the cycle, the minimum swelling force a3 represents the minimum swelling force variation trend of the battery surface of the battery provided in this embodiment during the cycle, and the minimum swelling force b3 represents the minimum swelling force variation trend of the battery surface of the comparative example during the cycle. As can be seen from the figure, the capacity retention rate of the battery provided by the embodiment decays to below 85% after 1800 weeks of cycling, while the capacity retention rate of the battery provided by the comparative example decays to below 85% after 1000 weeks of cycling, i.e. the cycling performance of the battery provided by the embodiment is obviously better than that of the battery of the comparative example; and as can be seen by comparing the maximum expansion force a2 with the maximum expansion force b2, after each week of cycling, the maximum expansion force of the cell surface provided by the present example is smaller than that of the comparative example cell surface, and as can be seen by comparing the minimum expansion force a3 with the minimum expansion force b3, after each week of cycling, the minimum expansion force of the cell surface provided by the present example is smaller than that of the comparative example cell surface, i.e., the expansion force of the cell of the present example is smaller than that of the comparative example cell, thus demonstrating that the cell performance provided by the present example is significantly better than that of the comparative example cell.
Fig. 8 and 9 are surface pressure distribution diagrams of the comparative example battery and the battery of this example at the end of the respective cycles (1000 cycles of the comparative example battery, 1800 cycles of the battery of this example). The contact pressure distribution condition of the surface of the battery is accurately measured by using the pressure distribution measuring system and the ultrathin flexible bendable film array pressure sensor, so that contact pressure distribution images of the whole battery surface as shown in fig. 8 and 9 are obtained, the pressure value of the battery surface can be seen through the depth of the color in the images, the deeper the color is, the larger the pressure value is, as can be seen from the images, the color in fig. 8 (comparative battery) is obviously darker than the color in fig. 9 (battery provided by the embodiment), especially, the color in the middle part of fig. 9 is obviously lighter than the color in fig. 8, namely, the middle expansion force of the battery provided by the embodiment is obviously reduced, and the expansion force is obviously improved.
As another implementation manner, the positive plate and the negative plate of the battery are cut from the pole piece material strip provided in the third embodiment, and the purpose of reserving space for expansion of the pole pieces and reducing the influence of expansion force on the battery performance can also be achieved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A coated gasket, comprising:
a connecting portion (11);
flow blocking parts (12) arranged at two ends of the connecting part (11) along the length direction;
the supporting part (13) is arranged between the flow blocking parts (12) at two ends along the length direction and is connected with the flow blocking part (12) at least one end, and the thickness of the supporting part (13) is smaller than that of the flow blocking part (12);
the bulge (14) is arranged on the supporting part (13) and is arranged at an interval with the flow blocking part (12), and the sum of the thicknesses of the bulge (14) and the supporting part (13) is smaller than the thickness of the flow blocking part (12);
the front ends of the flow blocking part (12), the supporting part (13) and the protruding part (14) along the coating direction are flush.
2. A coating pad according to claim 1, wherein a guiding area (17) is formed between the flow blocking portion (12) and the connecting portion (11), the guiding area (17) is adapted to accommodate external slurry, an end of the guiding area (17) away from the connecting portion (11) is a guiding groove (18), the guiding groove (18) is adapted to provide guiding for the slurry, and the supporting portion (13) is disposed in the guiding groove (18).
3. The coated gasket of claim 2 further comprising: shunt portion (15), with connecting portion (11) link to each other, shunt portion (15) with it is located to keep off class portion (12) connecting portion (11) same one side, just shunt portion (15) are located two keep off between class portion (12), shunt portion (15) with keep off class portion (12) interval setting, shunt portion (15) are kept away from the one end of connecting portion (11) with keep off class portion (12) and keep away from the one end of connecting portion (11) flushes.
4. The coating pad according to claim 3, wherein both ends of the supporting portion (13) are connected to the flow blocking portion (12) and the flow dividing portion (15), respectively, and the supporting portion (13) surrounds the connecting portion (11), the flow blocking portion (12) and the flow dividing portion (15) to form the flow guiding area (17).
5. The coating pad according to any one of claims 1-4, characterized in that the cross-section of the protrusions (14) is rectangular, the extension direction of the protrusions (14) being parallel to the coating direction.
6. A die, comprising:
the upper die head and the lower die head are arranged oppositely;
and a coating shim (1) according to any one of claims 1 to 5, the coating shim (1) being arranged between and abutting the upper and lower dies.
7. A pole piece strip, comprising:
a foil (3);
-a coating zone (21), said coating zone (21) being applied on said foil (3) using the die of claim 6.
8. The pole piece tape as claimed in claim 7, wherein the coating zone (21) comprises: a first painted area (211) and a second painted area (212), the second painted area (212) having a thickness smaller than the thickness of the first painted area (211).
9. The pole piece tape according to claim 8, wherein the width L1 of the second coating area (212) and the width L2 of the coating area (21) satisfy L1: L2= (2% -40%): 1; the thickness L5 of the second coating area (212) and the thickness L5 of the first coating area (211) meet the condition that L5: L6= (1-30%): 1.
10. A battery, comprising:
pole piece (4) cut from a strip of pole pieces according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220637191.2U CN217569429U (en) | 2022-03-22 | 2022-03-22 | Coating gasket, die head, pole piece material belt and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220637191.2U CN217569429U (en) | 2022-03-22 | 2022-03-22 | Coating gasket, die head, pole piece material belt and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217569429U true CN217569429U (en) | 2022-10-14 |
Family
ID=83539935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220637191.2U Active CN217569429U (en) | 2022-03-22 | 2022-03-22 | Coating gasket, die head, pole piece material belt and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217569429U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116364847A (en) * | 2023-05-30 | 2023-06-30 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
| WO2024041664A1 (en) * | 2023-05-30 | 2024-02-29 | 惠州亿纬动力电池有限公司 | Manufacturing method for battery electrode sheet, battery electrode sheet, and battery |
-
2022
- 2022-03-22 CN CN202220637191.2U patent/CN217569429U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116364847A (en) * | 2023-05-30 | 2023-06-30 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
| WO2024041664A1 (en) * | 2023-05-30 | 2024-02-29 | 惠州亿纬动力电池有限公司 | Manufacturing method for battery electrode sheet, battery electrode sheet, and battery |
| CN116364847B (en) * | 2023-05-30 | 2024-03-15 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217569429U (en) | Coating gasket, die head, pole piece material belt and battery | |
| JP4424501B2 (en) | Lithium ion secondary battery | |
| US3723181A (en) | Duplex electrode construction using continuous electrically nonconductive carrier strip | |
| CN111250354B (en) | Extrusion coating type die head gasket capable of eliminating coating edge effect | |
| US11108032B2 (en) | Method and apparatus for manufacturing secondary battery | |
| JP2003507861A (en) | Metal-air battery | |
| CN217606876U (en) | Pole piece, battery device and electronic equipment | |
| EP3576184B1 (en) | Lithium secondary battery | |
| CN217392823U (en) | Coating gasket, die head, pole piece material belt and battery | |
| CN214588911U (en) | Battery with a battery cell | |
| CN109888150B (en) | Lithium battery separator, wound product and wound lithium battery | |
| EP3576186B1 (en) | Lithium secondary battery | |
| CN109698320B (en) | Lithium battery positive plate, winding product and winding type lithium battery | |
| CN217334144U (en) | Pole piece | |
| CN116060251A (en) | Coating device, coating system and coating method | |
| CN214021747U (en) | Coating pad and coating device | |
| EP3576185B1 (en) | Lithium secondary battery | |
| KR20220037394A (en) | Dual slot die coater and electrode active material slurry coating method using the same | |
| CN209401741U (en) | Lithium battery cathode plate, winding product and coiling type lithium battery | |
| CN220041958U (en) | Anode plate, battery cell and soft package battery | |
| CN219051901U (en) | Slurry coating equipment and battery processing system | |
| KR102651932B1 (en) | Dual slot die coater | |
| CN109830644A (en) | The method for improving metal lithium electrode utilization rate by coating barrier coat | |
| CN219203199U (en) | Lithium battery cathode and lithium battery | |
| CN218731057U (en) | Current collector, pole piece and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |