CN217392823U - Coating gasket, die head, pole piece material belt and battery - Google Patents
Coating gasket, die head, pole piece material belt and battery Download PDFInfo
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- CN217392823U CN217392823U CN202220637183.8U CN202220637183U CN217392823U CN 217392823 U CN217392823 U CN 217392823U CN 202220637183 U CN202220637183 U CN 202220637183U CN 217392823 U CN217392823 U CN 217392823U
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Abstract
The utility model relates to a battery processing 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 the two ends of the connecting part along the length direction and are positioned at the front end of the connecting part along the coating direction; the bulge is connected with the connecting portion and formed by extending along the coating direction, the bulge and the flow blocking portion are arranged on the same side of the connecting portion at intervals, the thickness of the bulge is smaller than that of the flow blocking portion, and one end, far away from the connecting portion, of the bulge is flush with one end, far away from the connecting portion, of the flow blocking portion. The utility model provides a coating gasket is connected with connecting portion through the bellying that sets up along the coating direction extension to the thickness of bellying is less than the thickness that keeps off class portion, realizes that the regional thickness between the class portion that keeps off at both ends is different, thereby uses the different regions on the pole piece that the coating gasket that this embodiment provided processed to have different thickness, can be for pole piece inflation headspace, thereby reduces 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 is transferred onto 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 the prior art at different positions is the same, therefore, the thickness of the slurry coated at different positions of the foil is the same, the surface of the pole piece is flat, when the pole group is extruded due to the expansion force, the electrolyte at the middle part of the pole group with more serious deformation can be extruded, when the free electrolyte in the shell can not be supplemented to the middle of the electrode group in time, the ion channel is lost, further, lithium separation occurs, and potential safety hazards are caused, so that a coating gasket is urgently needed to be designed, and a pole piece with less influence of 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 pole piece receives the expansibility influence that coating gasket processed out among the prior art to a coating gasket that can process out 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 that solves lies in overcoming among the prior art battery and receives the great defect of expansibility influence to a battery that can reduce the expansibility 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 and are positioned at the front end of the connecting part along the coating direction;
the bulge, with connecting portion are connected to extend along the coating direction and form, and with keep off a class portion interval set up in same one side of connecting portion, the thickness of bulge is less than keep off class portion's thickness, the bulge is kept away from the one end of connecting portion with keep off class portion and keep away from the one end of connecting portion flushes.
Optionally, a diversion area is formed between the flow blocking portion and the connecting portion, at least part of the protrusion is disposed in the diversion area, the diversion area is suitable for accommodating external slurry, a diversion trench is further disposed at one end of the diversion area, which is far away from the connecting portion, and the diversion trench is suitable for guiding the slurry.
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, 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;
and the coating area is coated on the foil by using the die head.
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 painting zone and the width L2 of the painting zone satisfy L1: L2 (2% -40%): 1; the thickness L5 of the second coating area and the thickness L5 of the first coating area satisfy the condition that L5 is equal to L6 (1-30%) and 1 is equal to L6.
Optionally, the coating region is a positive coating.
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 set up along the bellying of coating direction extension with connecting portion are connected, and the thickness of bellying is less than keep off the thickness of class portion, realize both ends keep off that the region between the class portion can hold thick liquids thickness and follow connecting portion length direction has the difference to different regions have different thickness on the pole piece that the coating gasket that uses this embodiment to provide processed out, can be for pole piece inflation headspace, thereby reduce the influence of expansive force.
2. The utility model provides a coating gasket, through setting up keep off the class portion with be formed with the drainage district between the connecting portion, realize the drainage district holds outside thick liquids, and via the drainage district is kept away from the guiding gutter of one end department of connecting portion does the thick liquids provide the direction, realize deriving the thick liquids to guarantee the smoothness nature that the thick liquids flows, 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 stream portion, just reposition of redundant personnel portion with fender stream portion interval sets up, realizes via reposition of redundant personnel portion will two the region between the fender stream 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 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 strip of pole pieces manufactured 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 surface pressure profile 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; 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 solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. 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 the 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 is to 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 flow blocking parts 12 are arranged at two ends of the connecting part 11 along the length direction and are positioned at the front end of the connecting part 11 along the coating direction;
the bulge 14, with connecting portion 11 are connected to extend along the coating direction and form, and with keep off class portion 12 interval set up in connecting portion 11 same one side, the thickness of bulge 14 is less than keep off class portion 12's thickness, the bulge 14 is kept away from connecting portion 11 one end with keep off class portion 12 and keep away from connecting portion 11 one end flushes.
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; two ends of the connecting part 11 along the length direction are respectively provided with a flow blocking part 12, namely the coating gasket is provided with two flow blocking parts 12; the thickness refers to the dimension in the "thickness direction" indicated by the arrow in fig. 3; the leading end of the coating direction refers to a direction indicated by an arrow of "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 convex part 14 is H 14 In the area between the flow blocking parts 12 at the two ends, the corresponding position where the bulge part 14 is not arranged is enough to accommodate the thickness H of the slurry 12 The corresponding position provided with the convex part 14 can contain the thickness H of the slurry 12 -H 14 The thickness that realizes different positions and can hold the thick liquids is different to the pole piece that can obtain the active material layer that has different thickness correspondingly, thereby realize providing the headspace for the inflation change of pole piece, realize improving the purpose that the expansive force influences.
Optionally, the connecting portion 11, the flow blocking portion 12 and the protruding portion 14 are integrally formed.
Optionally, the thickness H of the flow baffle 12 12 Thickness H of the boss 14 14 Satisfies the relation: h 12 ＞H 14 。
Optionally, the thickness H of the boss 14 14 The value range is 0.01-0.8 mm.
The thickness H of the flow blocking portion 12 12 The convex partThickness H of the rise 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-mentioned relation was still satisfied, but "gasket thickness slurry outlet width" in the formula means H 12 Width of slurry outlet + (H) corresponding to the location where no boss 14 is provided 12 -H 14 ) The width of a slurry outlet corresponding to the position of the bulge part 14 is arranged, wherein the surface density of the positive electrode is 8-25 mg/cm 2 The coating width is 100-300 mm, the coating speed is 6-70 m/min, the solid content of the anode slurry is 65-80%, and the slurry density is 1.5-3 m 3 The gasket thickness is 0.5-2 mm, the slurry outlet width is 100-300 mm, and N/P is 1.02-1.4.
The coating gasket that this embodiment provided, through set up along the bellying 14 that the coating direction extends with connecting portion 11 is connected, and the thickness of bellying 14 is less than the thickness of baffling portion 12 realizes that the region between the baffling portion 12 can hold thick liquids thickness and follow connecting portion 11 length direction has the difference to different regions on the pole piece that the coating gasket that uses this embodiment to provide processed have different thickness, can reserve the space for the pole piece inflation, thereby reduce the influence of bulging force, and, bellying 14 with the structural style of connecting portion 11 lug connection is convenient for process and structural stability is good.
Specifically, a flow guiding area 17 is formed between the flow blocking portion 12 and the connecting portion 11, the protrusion portion 14 is at least partially disposed in the flow guiding area 17, the flow guiding area 17 is adapted to accommodate external slurry, a flow guiding groove 18 is further disposed at an end of the flow guiding area 17 away from the connecting portion 11, and the flow guiding groove 18 is adapted to provide guidance for the slurry.
It should be noted that the guiding area 17 is communicated with the outlet of the die, the slurry enters the guiding area 17 from the outlet of the die and then flows out through the guiding groove 18 to coat the slurry on the external structure, the protrusion 14 is at least partially located in the guiding area 17, the protrusion 14 is at least partially located in the guiding groove 18, and thus the thickness of the slurry in the guiding groove 18 is changed.
According to the coating gasket provided by the embodiment, the drainage area 17 is formed between the flow blocking part 12 and the connecting part 11, so that the drainage area 17 can accommodate external slurry, and the slurry is guided by the guide groove 18 at one end of the drainage area 17 far away from the connecting part 11, so that the slurry is guided out, the flowing smoothness of the slurry is ensured, and the processing efficiency is improved.
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 portion 15 and the flow blocking portion 12 are provided at an interval, which means that the division portion 15 and the flow blocking portion 12 are not connected; the flow dividing portion 15, the connecting portion 11, and the flow blocking portion 12 are on the same plane at one end surface in the thickness direction.
Optionally, the connecting portion 11, the flow blocking portion 12, the protruding portion 14, and the flow dividing portion 15 are integrally formed.
Optionally, the flow dividing part 15 extends along the coating direction, and further optionally, the extending direction of the flow dividing part 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, 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 correspondingly in the area for coating each column.
Example two
The present embodiment provides a die comprising:
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.
It should be noted that the upper die and the lower die constitute two parts of the die, the surfaces of the upper die opposite to the lower die are both flat surfaces, the coating pad 1 is sandwiched between the upper die and the lower die, so that a gap is formed between the upper die head and the lower die head, the upper die head and/or the lower die head being in communication with a container containing a slurry, the upper die head and/or the lower die head is provided with a discharge hole which is arranged corresponding to the drainage area 17 of the coating gasket 1, the slurry enters the drainage area 17 through the discharge hole, and then guided through the guide grooves 18 to flow out from a gap formed between the upper die and the lower die, thereby coating the slurry on an external structure, wherein the external structure may be a foil used to make a battery pole piece.
EXAMPLE III
With reference to fig. 4 to fig. 6, the present embodiment provides a pole piece material strip, 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 fig. 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, correspondingly, the pole piece material strip 2 shown in fig. 4 is obtained by using a die head mounted with the coating gasket 1 shown in fig. 2, a length direction of the coating gasket 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, wherein 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 figure 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 width direction both ends is taken, 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 width direction is taken, coating gasket 1's bellying 14 corresponds the second coating district 212 of pole piece material area 2, coating gasket 1 does not set up the position of bellying 14 corresponds the first coating district 211 of pole piece material area 2, wherein, empty foil district 22 is only foil 3 on pole piece material area 2 and do not have the region of thick liquids coating. The pole piece material belt 2 in fig. 4 is cut along a slitting line 23 in the middle of the width direction of the material belt to obtain the single-row coated material belt shown in fig. 5, the slitting line 23 in fig. 5 is continued to cut to obtain the material belt with the material belt width of L2, then the slitting line 23 in fig. 5 is continued to cut along the length direction of the material belt to obtain the pole piece 4 with the length of L3 shown in fig. 6, the pole piece 4 comprises a coating area 21 with the width of L2 and a tab 41, and the tab 41 is formed by cutting a hollow foil area 22 in the pole piece material belt 2.
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 far 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 tape.
Specifically, the width L1 of the second paint region 212 and the width L2 of the paint region 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 the condition that L5 is equal to L6 (1-30%) and 1 is included.
It should be noted that when the range values of L1: L2 (2% -40%) to 1 and L5: L6 (1% -30%) to 1 are adopted, the battery assembled by the pole piece 4 can ensure enough space for the pole piece to expand, and the capacity of the battery cannot be reduced due to too few coating layers.
Specifically, the coating region 21 is a positive electrode coating.
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 comprises a negative pole piece and a diaphragm, and the negative pole piece is a pole piece with a flat surface commonly used.
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, the thickness of the coating layer in the middle area of the positive plate is smaller than that in the edge area, so that compared with the edge area of the battery, the N/P ratio (namely the ratio of the negative electrode active material to the positive electrode active material) in the middle area is larger, 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
Referring to fig. 7, the abscissa is the number of cycles of charging and discharging the battery, and the two ordinates are the capacity retention rate and the swelling force of the battery during the cycle, respectively, in the figure, six data lines are shown, wherein, the capacity retention rate a1 represents the capacity retention rate variation trend of the battery provided by the embodiment in the circulation process, the capacity retention rate b1 represents the capacity retention rate variation trend of the battery provided by the comparative example in the circulation process, the maximum expansion force a2 represents the maximum expansion force variation trend of the battery surface provided by the embodiment in the circulation process, the maximum expansion force b2 represents the maximum expansion force variation trend of the battery surface provided by the comparative example in the circulation process, the minimum expansion force a3 represents the minimum expansion force variation trend of the battery surface provided by the embodiment in the circulation process, and the minimum expansion force b3 represents the minimum expansion force variation trend of the battery surface provided by the comparative example in the circulation process. 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 it can be seen from the comparison of the maximum expansion force a2 with the maximum expansion force b2 that the maximum expansion force of the cell surface provided by the present example was smaller than that of the comparative example cell surface after each week of cycling, and it can be seen from the comparison of the minimum expansion force a3 with the minimum expansion force b3 that the minimum expansion force of the cell surface provided by the present example was smaller than that of the comparative example cell surface after each week of cycling, i.e., the expansion force of the cell of the present example was smaller than that of the comparative example cell, thus demonstrating that the cell provided by the present example has significantly better performance than 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 that in fig. 9 (battery provided by the embodiment), especially, the color in the middle part of fig. 9 is obviously lighter than that 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);
the flow blocking parts (12) are arranged at two ends of the connecting part (11) along the length direction and are positioned at the front end of the connecting part (11) along the coating direction;
bulge (14), with connecting portion (11) are connected to extend along the coating direction and form, and with keep off class portion (12) interval set up in same one side of connecting portion (11), the thickness of bulge (14) is less than keep off the thickness of class portion (12), bulge (14) 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.
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 protrusion (14) is at least partially disposed in the guiding area (17), the guiding area (17) is adapted to accommodate external slurry, a guiding groove (18) is further disposed at an end of the guiding area (17) away from the connecting portion (11), and the guiding groove (18) is adapted to provide guiding for the slurry.
3. The coated gasket of claim 2 further comprising: reposition of redundant personnel portion (15), with connecting portion (11) link to each other, reposition of redundant personnel portion (15) with it is located to keep off class portion (12) connecting portion (11) same one side, just reposition of redundant personnel portion (15) are located two keep off between class portion (12), reposition of redundant personnel portion (15) with it sets up to keep off class portion (12) interval, reposition of redundant personnel 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. Coating pad according to any of claims 1-3, 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.
5. 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 4, the coating shim (1) being arranged between and abutting the upper and lower dies.
6. 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 5.
7. The pole piece tape as claimed in claim 6, wherein said coating zone (21) comprises: a first painted area (211) and a second painted area (212), the second painted area (212) having a thickness less than the thickness of the first painted area (211).
8. The pole piece tape of claim 7, wherein the width L1 of the second paint region (212) and the width L2 of the paint region (21) satisfy the condition that L1: L2 is (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 is equal to L6 (1-30%): 1.
9. The pole piece tape of claim 7 wherein the coating region (21) is a positive coating.
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 |
|---|---|---|---|
| CN202220637183.8U CN217392823U (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 |
|---|---|---|---|
| CN202220637183.8U CN217392823U (en) | 2022-03-22 | 2022-03-22 | Coating gasket, die head, pole piece material belt and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217392823U true CN217392823U (en) | 2022-09-09 |
Family
ID=83137313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220637183.8U Active CN217392823U (en) | 2022-03-22 | 2022-03-22 | Coating gasket, die head, pole piece material belt and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217392823U (en) |
-
2022
- 2022-03-22 CN CN202220637183.8U patent/CN217392823U/en active Active
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