CN218004965U - Roll up core and battery - Google Patents
Roll up core and battery Download PDFInfo
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- CN218004965U CN218004965U CN202222121661.2U CN202222121661U CN218004965U CN 218004965 U CN218004965 U CN 218004965U CN 202222121661 U CN202222121661 U CN 202222121661U CN 218004965 U CN218004965 U CN 218004965U
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Abstract
The utility model provides a roll core and a battery, wherein the roll core comprises a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, the polarities of the first pole piece and the second pole piece are opposite, the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are stacked and wound from the head end to the tail end to form a roll core; the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position, and the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position. The utility model discloses aim at solving current book core and cause the bad problem of cover easily when convoluteing.
Description
Technical Field
The utility model relates to a lithium ion battery technical field particularly, relates to a roll up core and battery.
Background
Lithium ion batteries have the advantages of light weight, good safety performance and the like, and are already in monopoly for application in the fields of mobile electronic devices such as bluetooth headsets, mobile phones, notebook computers, tablet computers, cameras and the like, portable mobile power supplies and the like. Meanwhile, people put higher demands on the energy density of the lithium ion battery.
At present, in the manufacturing of a winding type lithium ion battery, after pole pieces are stacked together according to the order of a diaphragm, a negative pole piece, a diaphragm and a positive pole piece, a winding core is formed by winding from the head to the tail of the negative pole piece by taking the head of the negative pole piece as the center. When the winding is carried out, the positive plate and the negative plate are clamped by the plate feeding mechanism and are fed into the winding mechanism. Before winding, the positive and negative plates are cut by the cutter and then wound. Before the winding and the winding are finished, the positive and negative pole pieces have certain lengths and are in an unbound free state, and the positions are easy to deviate in the width direction (namely the winding direction), so that poor coverage is caused, and the yield and the safety risk of a winding core are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving current book core and cause the problem of covering badly easily when convoluteing.
In order to solve the above problem, a first aspect of the present invention provides a winding core, including a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, wherein the polarities of the first pole piece and the second pole piece are opposite, and the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are stacked and wound from a head end to a tail end to form the winding core;
the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position, and the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position.
Furthermore, along the thickness direction of the roll core, the pole pieces positioned on the two opposite sides of the head end of the first pole piece are the first pole pieces.
Further, still include first utmost point ear and second utmost point ear, first utmost point ear is close to first pole piece sets up along the both ends of coiling direction, and/or, the second utmost point ear is located between the both ends of coiling direction are followed to the second utmost point piece.
Furthermore, the head end of the first pole piece is a double-sided empty foil area, the first tab is arranged close to the head end of the first pole piece, the head end of the second pole piece is a double-sided empty foil area, and the second tab is arranged close to the head end of the second pole piece;
and/or the presence of a gas in the atmosphere,
the first pole piece and the position that the head end of second pole piece is relative covers there is first adhesive paper layer, the second pole piece sets up at least one side surface covering in second utmost point ear position has second adhesive paper layer.
Further, first pole piece is the negative pole piece, the second pole piece is the positive plate, the second pole piece forms the two-sided empty foil district of second pole piece, the two-sided coating district of second pole piece, the two-sided empty foil district of second pole piece and the two-sided empty foil district of second pole piece in proper order from the head end to the tail end along the direction of coiling, the two-sided empty foil district of second pole piece with at least one side surface covering of the handing-over department in the two-sided coating district of second pole piece has the third adhesive paper layer, the two-sided coating district of second pole piece with at least one side surface covering of the handing-over department in the two-sided empty foil district of second pole piece has the fourth adhesive paper layer, the two-sided empty foil district of second pole piece with at least one side surface covering of the handing-over department in the two-sided empty foil district of second pole piece has the fifth adhesive paper layer.
Further, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the first pole piece sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided empty foil area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area and a first pole piece double-sided empty foil area from the head end to the tail end along the winding direction, at least one side surface of the joint of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a third adhesive paper layer, at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a fourth adhesive paper layer, and at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a fifth adhesive paper layer.
Furthermore, the first tab and the second tab are both arranged in the middle of the winding core, at least one side surface of the first pole piece, where the first tab is arranged, is covered with a first adhesive paper layer, and at least one side surface of the second pole piece, where the second tab is arranged, is covered with a second adhesive paper layer;
and/or the presence of a gas in the atmosphere,
the position of the second pole piece opposite to the first pole lug is covered with a third adhesive paper layer, and the position of the first pole piece opposite to the second pole lug is covered with a fourth adhesive paper layer.
Further, first pole piece is the negative pole piece, the second pole piece is the positive plate, the second pole piece forms second pole piece two-sided coating district, second pole piece single-sided coating district and the two-sided empty paper tinsel district of second pole piece along the direction of coiling from the head end to the tail end in proper order, the two-sided coating district of second pole piece with at least one side surface covering in the handing-over department in second pole piece single-sided coating district has fifth adhesive paper layer, the two-sided coating district of second pole piece with at least one side surface covering in the handing-over department in the two-sided empty paper tinsel district of second pole piece has sixth adhesive paper layer.
Further, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the first pole piece sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided empty foil area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area and a first pole piece double-sided empty foil area from the head end to the tail end along the winding direction, at least one side surface of the joint of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a fifth adhesive paper layer, at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a sixth adhesive paper layer, and at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a seventh adhesive paper layer.
The second aspect of the utility model provides a battery, including casing and the first aspect arbitrary the core of rolling up, roll up the core and encapsulate in the casing.
The utility model provides a roll up core and battery, first pole piece, first diaphragm and second diaphragm are located same roll position, first pole piece, first diaphragm and second diaphragm are located same rolling position, first pole piece clamp is established between first diaphragm and second diaphragm, at the in-process of coiling, first pole piece is convoluteed with two diaphragms in step, and first pole piece is established by two diaphragm clamps, make first pole piece be in centre gripping constraint state, the position at the direction of coiling is in the stationary state, can avoid first pole piece at the direction of coiling off tracking, can reduce the volatility that the pole piece covered, be favorable to improving the covering stability and the uniformity that roll up the core and convolute, and simultaneously, can reduce the safety risk that the core lithium was analysed to the book, reduce the size design surplus of the super positive plate of negative pole piece, thereby improve the energy density of battery.
Drawings
Fig. 1 is a schematic structural diagram of a first winding core in an embodiment of the present invention;
fig. 2 is a schematic structural view of a second type of winding core in an embodiment of the present invention;
fig. 3 is a schematic structural view of a third core according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fourth winding core in the embodiment of the present invention.
Description of the reference numerals:
10-a first pole piece; 20-a second pole piece; 30-a first membrane; 40-a second membrane; 50-a first tab; 60-a second tab; 70-a first adhesive paper layer; 71-a second adhesive paper layer; 72-a third adhesive paper layer; 73-a fourth ply of adhesive paper; 74-a fifth glue paper layer; 75-a sixth adhesive paper layer; 76-a seventh adhesive paper layer; 77-eighth adhesive paper layer.
Detailed Description
The technical solution of the present invention will be described in detail and clearly with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. Furthermore, in the description of the present invention, "at least one" means one or more unless specifically limited otherwise.
In the description of the present specification, the term "on the basis of the above-described embodiments" means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
With reference to fig. 1 to 4, a first aspect of the embodiments of the present application provides a winding core, where the winding core includes a first pole piece 10, a second pole piece 20, a first separator 30, and a second separator 40, the polarities of the first pole piece 10 and the second pole piece 20 are opposite, the first separator 30, the first pole piece 10, the second separator 40, and the second pole piece 20 are stacked and wound from a head end to a tail end to form a winding core, where the head ends of the first pole piece 10 and the second pole piece 20 are both located inside the winding core, and the tail ends of the first pole piece 10 and the second pole piece 20 are both located outside the winding core;
the first pole piece 10, the first diaphragm 30 and the second diaphragm 40 are located at the same rolling position, and the first pole piece 10, the first diaphragm 30 and the second diaphragm 40 are located at the same rolling position.
The roll core that this embodiment provided, first pole piece, first diaphragm and second diaphragm are located same roll position, first pole piece, first diaphragm and second diaphragm are located same rolling position, first pole piece presss from both sides and establishes between first diaphragm and second diaphragm, at the in-process of coiling, first pole piece is convoluteed with two diaphragms in step, and first pole piece is pressed from both sides by two diaphragms and establishes, make first pole piece be in centre gripping constraint state, the position at the direction of coiling is in fixed state, can avoid first pole piece at the direction of coiling off tracking, can reduce the volatility that the pole piece covered, be favorable to improving the covering stability and the uniformity that roll core was convoluteed, and simultaneously, can reduce the safety risk that the lithium was analysed to the roll core, reduce the size design allowance of the super positive plate of negative pole piece, thereby improve the energy density of battery.
The head end refers to one end of the winding core where the first pole piece 10 and the second pole piece 20 start to be wound in the winding process, and the tail end refers to one end of the winding core where the first pole piece 10 and the second pole piece 20 finish to be wound in the winding process.
The head end of first pole piece 10, the head end of first diaphragm 30 and the head end parallel and level of second diaphragm 40, perhaps, the tail end of first pole piece 10, the tail end of first diaphragm 30 and the tail end parallel and level of second diaphragm 40, from this, the first pole piece 10 of avoiding that can be better is at the off tracking of coiling direction, can further improve the stability and the uniformity of coiling the cover.
It should be noted that, in the winding process of the actual winding core, because the winding radii of the first pole piece 10, the first diaphragm 30 and the second diaphragm 40 are different, as long as the distance between the head end of the first pole piece 10 and the head end of the first diaphragm 30 and the head end of the second diaphragm 40 in the winding direction is in the range of 0 to 3mm, the head end of the first pole piece 10, the head end of the first diaphragm 30 and the head end of the second diaphragm 40 may be considered to be flush, or as long as the distance between the tail end of the first pole piece 10 and the tail end of the first diaphragm 30 and the tail end of the second diaphragm 40 in the winding direction is in the range of 0 to 3mm, the tail end of the first pole piece 10, the tail end of the first diaphragm 30 and the tail end of the second diaphragm 40 may be considered to be flush.
In the present embodiment, the winding length of the second pole piece 20 is not further limited, but the winding lengths of the first pole piece 10 and the second pole piece 20 are different. The winding length of the second pole piece 20 may be longer than that of the first pole piece 10, and the winding length of the second pole piece 20 may be shorter than that of the first pole piece 10.
Along the thickness direction of rolling up the core, the pole piece that is located the relative both sides of head end of first pole piece 10 is first pole piece 10, also, the pole piece just right with the upside surface of the head end of first pole piece 10 is first pole piece 10, also is first pole piece 10 with the just right pole piece of downside surface of the head end of first pole piece 10, from this, can avoid the burr on the head end surface of first pole piece 10 to pierce through the diaphragm, lead to first pole piece 10 and the contact of second pole piece 20, thereby cause two pole piece contact short circuits.
The first pole piece 10 may be a positive pole piece, and the second pole piece 20 may be a negative pole piece, and correspondingly, the first pole piece 10 may also be a negative pole piece, and the second pole piece 20 may be a positive pole piece.
The winding core further comprises a first tab 50 and a second tab 60, wherein the first tab 50 can be arranged close to two ends of the first pole piece 10 along the winding direction, and the first tab 50 can also be positioned between two ends of the first pole piece 10 along the winding direction, that is, the first tab 50 can be close to the head end or the tail end of the winding core, and the first tab 50 can also be positioned in the middle of the winding core; the second tab 60 may be close to both ends of the second pole piece 20 in the winding direction, and the second tab 60 may also be located between both ends of the second pole piece 20 in the winding direction, that is, the second tab 60 may be close to the head end or the tail end of the winding core, and the second tab 60 may also be located in the middle of the winding core.
In order to better protect the winding core and prevent short circuit, the local area of the pole piece needs to be pasted with adhesive tape, and according to the position of the tab, the first pole piece 10 is a positive pole or a negative pole, and the adhesive tape is pasted at different positions of the pole piece.
Specifically, as shown in fig. 1 and 2, the first tab 50 is disposed near the head end of the winding core, and the second tab 60 is also disposed near the head end of the winding core, wherein:
in an alternative embodiment, as shown in fig. 1, the first pole piece 10 is a negative pole piece, the second pole piece 20 is a positive pole piece, the first pole piece 10 sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided coating area and a first pole piece double-sided coating area from the head end to the tail end along the winding direction, and the first tab 50 is disposed near the head end of the first pole piece 10;
the second pole piece 20 sequentially forms a second pole piece double-sided empty foil area, a second pole piece double-sided coating area, a second pole piece single-sided coating area and a second pole piece double-sided empty foil area from the head end to the tail end along the winding direction, and the second pole lug 60 is arranged close to the head end of the second pole piece 20;
the first pole piece 10 comprises a first current collector and a first active substance layer coated on the surface of the first current collector, and the double-sided empty foil area of the first pole piece means that the first active substance layer is not covered on two opposite surfaces of the first pole piece 10; the first pole piece single-side coating area refers to that one of two opposite surfaces of the first pole piece 10 is covered with a first active material layer, and the other surface is not covered with the first active material layer; the first pole piece double-sided coating area means that two opposite surfaces of the first pole piece 10 are covered with first active material layers.
The second pole piece 20 comprises a second current collector and a second active material layer coated on the surface of the second current collector, and the double-sided empty foil area of the second pole piece means that the second active material layer is not covered on two opposite surfaces of the second pole piece 20; the second pole piece single-side coating area means that one of two opposite surfaces of the second pole piece 20 is covered with a second active material layer, and the other surface is not covered with the second active material layer; the second electrode double-sided coating region means that both opposite surfaces of the second electrode 20 are covered with the second active material layer.
In order to avoid the short circuit phenomenon caused by the membrane pierced by the burr on the edge of the head end of the second diode 20, the first adhesive paper layer 70 covers the position of the first pole piece 10 opposite to the head end of the second diode 20, and the projection of the first adhesive paper layer 70 along the thickness direction of the winding core covers the projection of the head end of the second diode 20 along the thickness direction of the winding core.
In order to prevent lithium ions at the position of the second pole piece 20 where the second pole lug 60 is arranged from being extracted without an active material layer for being inserted in the process of charging and discharging, so that lithium is separated out to form lithium dendrite to pierce through the membrane, and a short circuit phenomenon is caused, at least one side surface of the second pole piece 20 where the second pole lug 60 is arranged is covered with a second adhesive paper layer 71; preferably, the second tab 20 is covered with the second adhesive paper layer 71 on both side surfaces of the second tab 60, so as to further avoid the occurrence of short circuit.
At least one side surface of the joint of the second pole piece double-sided empty foil area and the second pole piece double-sided coating area, the joint of the second pole piece double-sided coating area and the second pole piece single-sided empty foil area, and the joint of the second pole piece single-sided empty foil area and the second pole piece double-sided empty foil area is covered with a glue paper layer, so that lithium ions at the joints of the areas of the second pole piece 20 can be prevented from being separated out and having no active material layer for embedding, and lithium is separated out to form a lithium dendrite piercing diaphragm, and a short circuit phenomenon is caused. Specifically, at least one side surface of the junction of the second diode double-sided empty foil area and the second diode double-sided coating area is covered with a third adhesive paper layer 72, at least one side surface of the junction of the second diode double-sided coating area and the second diode single-sided empty foil area is covered with a fourth adhesive paper layer 73, and at least one side surface of the junction of the second diode single-sided empty foil area and the second diode double-sided empty foil area is covered with a fifth adhesive paper layer 74.
In addition, in order to prevent burrs from being cut into the cut end of the second pole piece 20, which may cause a short circuit phenomenon by puncturing the separator, the end of the double-sided empty foil area of the second pole piece 20 may be provided with a sixth adhesive paper layer 75.
In another alternative embodiment, as shown in fig. 2, the first pole piece 10 is a positive pole piece, the second pole piece 20 is a negative pole piece, the first pole piece 10 sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided coating area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area and a first pole piece double-sided empty foil area from a head end to a tail end along a winding direction, and the first tab 50 is disposed near the head end of the first pole piece 10;
the second pole piece 20 sequentially forms a second pole piece double-sided empty foil area and a second pole piece double-sided coating area from the head end to the tail end along the winding direction, and the second pole lug 60 is arranged close to the head end of the second pole piece 20;
in order to avoid the short circuit phenomenon caused by the membrane pierced by the burr at the edge of the head end of the second pole piece 20, the first adhesive paper layer 70 covers the position of the first pole piece 10 opposite to the head end of the second pole piece 20, and the projection of the first adhesive paper layer 70 along the thickness direction of the winding core covers the projection of the head end of the second pole piece 20 along the thickness direction of the winding core.
In order to prevent lithium ions at the position of the second pole piece 20 where the second pole lug 60 is arranged from being extracted without an active material layer for being inserted in the process of charging and discharging, so that lithium is separated out to form lithium dendrite to pierce through the membrane, and a short circuit phenomenon is caused, at least one side surface of the second pole piece 20 where the second pole lug 60 is arranged is covered with a second adhesive paper layer 71; preferably, the second tab 20 is covered with the second adhesive paper layer 71 on both sides of the second tab 60, so as to further avoid the occurrence of short circuit.
The junction of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area, the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area, and at least one side surface of the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area are covered with adhesive paper layers, so that lithium ions at the junctions of the regions of the first pole piece 10 can be prevented from being separated out and having no active material layer for embedding, and lithium is separated out to form lithium dendrites to pierce through the diaphragm, and a short circuit phenomenon is caused. Specifically, at least one side surface of the joint of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a third adhesive paper layer 72, at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a fourth adhesive paper layer 73, and at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a fifth adhesive paper layer 74.
In addition, in order to prevent burrs at the cut end of the tail end of the first pole piece 10 from piercing the separator and causing short circuit, a sixth adhesive paper layer 75 may be disposed at the tail end of the double-sided empty foil area of the first pole piece 10.
As shown in fig. 3 and 4, the first tab 50 is disposed in the middle of the winding core, and the second tab 60 is disposed in the middle of the winding core, specifically:
referring to fig. 3, in an alternative embodiment, the first pole piece 10 is a negative pole piece, the second pole piece 20 is a positive pole piece, and the first pole piece 10 sequentially forms a first double-sided empty foil area, a first single-sided coating area and a first double-sided empty foil area from the head end to the tail end along the winding direction; the second pole piece 20 sequentially forms a second pole piece double-sided coating area, a second pole piece single-sided coating area and a second pole piece double-sided empty foil area from the head end to the tail end along the winding direction.
In order to prevent the lithium ions at the position of the first pole piece 10 where the first pole lug 60 is arranged and at the position of the second pole piece 20 where the second pole lug 60 is arranged from being extracted without an active material layer for insertion, so that lithium is precipitated to form lithium dendrites to pierce through the membrane, and a short circuit phenomenon is caused, a first adhesive paper layer 70 covers at least one side surface of the first pole piece 10 where the first pole lug 50 is arranged, and a second adhesive paper layer 71 covers at least one side surface of the second pole piece 20 where the second pole lug 60 is arranged; preferably, the first adhesive paper layer 70 covers both surfaces of the first pole piece 10 at the position of the first tab 50, and the second adhesive paper layer 71 covers both surfaces of the second pole piece 20 at the position of the second tab 60, so as to further avoid the occurrence of short circuit.
In order to further protect the winding core and prevent lithium dendrites formed by lithium deposition from penetrating the separator to cause a short circuit phenomenon, on the basis of the above embodiment, the position of the second pole tab 20 opposite to the first pole tab 50 is covered with the third adhesive paper layer 72, and the size of the third adhesive paper layer 72 is larger than that of the first adhesive paper layer 70, that is, the projection of the third adhesive paper layer 72 along the thickness direction of the winding core covers the projection of the first adhesive paper layer 70 along the thickness direction of the winding core; the position of the first pole piece 10 opposite to the second pole lug 60 is covered with a fourth adhesive paper layer 73, and the size of the fourth adhesive paper layer 73 is smaller than that of the second adhesive paper layer 71, that is, the projection of the second adhesive paper layer 71 along the thickness direction of the winding core covers the projection of the fourth adhesive paper layer 73 along the thickness direction of the winding core.
The junction of the second pole piece double-sided coating area and the second pole piece single-sided coating area and at least one side surface of the junction of the second pole piece single-sided coating area and the second pole piece double-sided empty foil area are covered with the adhesive paper layer, so that lithium ions at the junction of each area of the second pole piece 20 can be prevented from being extracted without an active material layer for embedding, and lithium is separated to form lithium dendrite piercing a diaphragm, and a short circuit phenomenon is caused. Specifically, at least one side surface of the junction of the second diode double-sided coating area and the second diode single-sided coating area is covered with a fifth adhesive paper layer 74, and at least one side surface of the junction of the second diode single-sided coating area and the second diode double-sided empty foil area is covered with a sixth adhesive paper layer 75.
In addition, in order to prevent burrs from being cut into the cut end of the second pole piece 20, which may cause a short circuit phenomenon by puncturing the separator, the seventh adhesive paper layer 76 may be provided at the end of the double-sided empty foil area of the second pole piece 20.
In another alternative embodiment, as shown in fig. 4, the first pole piece 10 is a positive pole piece, the second pole piece 20 is a negative pole piece, and the first pole piece 10 sequentially forms a first double-sided empty foil area, a first single-sided coating area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area, and a first pole piece double-sided empty foil area from the head end to the tail end along the winding direction; the second pole piece 20 forms only a second pole piece double-sided application area from the leading end to the trailing end in the winding direction.
In order to prevent the lithium ions at the position of the first pole piece 10 where the first pole lug 60 is arranged and at the position of the second pole piece 20 where the second pole lug 60 is arranged from being extracted without an active material layer for insertion, so that lithium is precipitated to form lithium dendrites to pierce through the membrane, and a short circuit phenomenon is caused, a first adhesive paper layer 70 covers at least one side surface of the first pole piece 10 where the first pole lug 50 is arranged, and a second adhesive paper layer 71 covers at least one side surface of the second pole piece 20 where the second pole lug 60 is arranged; preferably, the first adhesive paper layer 70 covers both surfaces of the first pole piece 10 at the position of the first tab 50, and the second adhesive paper layer 71 covers both surfaces of the second pole piece 20 at the position of the second tab 60, so as to further avoid the occurrence of short circuit.
In order to further protect the winding core and prevent lithium dendrites formed by lithium deposition from penetrating the separator to cause a short circuit phenomenon, on the basis of the above embodiment, the position of the second pole tab 20 opposite to the first pole tab 50 is covered with the third adhesive paper layer 72, and the size of the third adhesive paper layer 72 is smaller than that of the first adhesive paper layer 70, that is, the projection of the first adhesive paper layer 70 along the thickness direction of the winding core covers the projection of the third adhesive paper layer 72 along the thickness direction of the winding core; the position of the first pole piece 10 opposite to the second pole lug 60 is covered with a fourth adhesive paper layer 73, and the size of the fourth adhesive paper layer 73 is larger than that of the second adhesive paper layer 71, that is, the projection of the fourth adhesive paper layer 73 along the thickness direction of the winding core covers the projection of the second adhesive paper layer 71 along the thickness direction of the winding core.
The junction of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area, the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area, and at least one side surface of the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area are covered with adhesive paper layers, so that lithium ions at the junctions of the regions of the first pole piece 10 can be prevented from being separated out and having no active material layer for embedding, and lithium is separated out to form lithium dendrites to pierce through the diaphragm, and a short circuit phenomenon is caused. Specifically, at least one side surface of the joint of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a fifth adhesive paper layer 74, at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a sixth adhesive paper layer 75, and at least one side surface of the joint of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a seventh adhesive paper layer 76.
In addition, in order to prevent burrs at the cut end of the tail end of the first pole piece 10, which may cause a short circuit phenomenon by puncturing the separator, an eighth adhesive paper layer 77 may be disposed at the tail end of the double-sided empty foil area of the first pole piece 10.
No matter how the structure of the roll core is set, the outer ring of the roll core is always the tail of the positive plate, so that the outer ring of the roll core and the shell of the battery can be prevented from forming a primary battery, electrochemical corrosion occurs, and damage and leakage of the battery are caused.
In the above embodiment, the first pole piece 10 and the second pole piece 20 may be one or more metal foils such as aluminum foil, copper foil, nickel foil, gold foil, or platinum foil, and preferably, the first pole piece 10 is aluminum foil, the second pole piece 20 is copper foil, the first tab 50 is also aluminum foil, and the second tab 60 is also copper foil.
A second aspect of embodiments of the present application provides a battery including a can and a jelly roll according to the first aspect, the jelly roll being enclosed in the can.
The housing is not further limited in this embodiment, and those skilled in the art can select the housing according to actual situations, for example, the housing is an aluminum plastic film housing.
The battery that this embodiment provided, the length of first pole piece equals with the length of first diaphragm and second diaphragm, first pole piece clamp is established between first diaphragm and second diaphragm, at the in-process of coiling, first pole piece is convoluteed with two diaphragms in step, and first pole piece is established by two diaphragm clamps, make first pole piece be in centre gripping constraint state, the position in coiling direction is in fixed state, can avoid first pole piece at the coiling direction off tracking, can reduce the volatility that the pole piece covers, be favorable to improving the covering stability and the uniformity that roll up the core and convolute, and simultaneously, can reduce the safety risk that the core analyzed lithium, reduce the size design allowance of the super positive plate of negative pole piece, thereby improve the energy density of battery.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.
Claims (10)
1. A winding core is characterized by comprising a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, wherein the polarities of the first pole piece and the second pole piece are opposite, and the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are stacked and wound from the head end to the tail end to form the winding core;
the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position, and the first pole piece, the first diaphragm and the second diaphragm are located at the same rolling position.
2. The winding core according to claim 1, wherein the first pole piece is positioned on two opposite sides of the head end of the first pole piece in the thickness direction of the winding core.
3. The winding core according to claim 1, further comprising a first tab and a second tab, wherein the first tab is disposed near both ends of the first pole piece in the winding direction, and/or wherein the second tab is disposed between both ends of the second pole piece in the winding direction.
4. The winding core according to claim 3, wherein the head end of the first pole piece is a double-sided empty foil area, the first tab is arranged close to the head end of the first pole piece, the head end of the second pole piece is a double-sided empty foil area, and the second tab is arranged close to the head end of the second pole piece;
and/or the presence of a gas in the gas,
the first pole piece and the position that the head end of second pole piece is relative covers there is first adhesive paper layer, the second pole piece sets up at least one side surface covering in second utmost point ear position has second adhesive paper layer.
5. The winding core according to claim 4, wherein the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the second pole piece sequentially forms a second pole piece double-sided empty foil area, a second pole piece double-sided coating area, a second pole piece single-sided empty foil area and a second pole piece double-sided empty foil area from a head end to a tail end along a winding direction, at least one side surface of a junction of the second pole piece double-sided empty foil area and the second pole piece double-sided coating area is covered with a third adhesive paper layer, at least one side surface of a junction of the second pole piece double-sided coating area and the second pole piece single-sided empty foil area is covered with a fourth adhesive paper layer, and at least one side surface of a junction of the second pole piece single-sided empty foil area and the second pole piece double-sided empty foil area is covered with a fifth adhesive paper layer.
6. The winding core according to claim 4, wherein the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the first pole piece sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided empty foil area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area and a first pole piece double-sided empty foil area from the head end to the tail end along the winding direction, at least one side surface of the junction of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a third adhesive paper layer, at least one side surface of the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a fourth adhesive paper layer, and at least one side surface of the junction of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a fifth adhesive paper layer.
7. The winding core according to claim 3, wherein the first tab and the second tab are both arranged in the middle of the winding core, a first adhesive paper layer covers at least one side surface of the first pole piece where the first tab is arranged, and a second adhesive paper layer covers at least one side surface of the second pole piece where the second tab is arranged;
and/or the presence of a gas in the gas,
the position of the second pole piece opposite to the first pole lug is covered with a third adhesive paper layer, and the position of the first pole piece opposite to the second pole lug is covered with a fourth adhesive paper layer.
8. The winding core according to claim 7, wherein the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the second pole piece sequentially forms a second pole piece double-sided coating area, a second pole piece single-sided coating area and a second pole piece double-sided empty foil area from the head end to the tail end along the winding direction, at least one side surface of the junction of the second pole piece double-sided coating area and the second pole piece single-sided coating area is covered with a fifth adhesive paper layer, and at least one side surface of the junction of the second pole piece single-sided coating area and the second pole piece double-sided empty foil area is covered with a sixth adhesive paper layer.
9. The winding core according to claim 7, wherein the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the first pole piece sequentially forms a first pole piece double-sided empty foil area, a first pole piece single-sided empty foil area, a first pole piece double-sided coating area, a first pole piece single-sided empty foil area and a first pole piece double-sided empty foil area from a head end to a tail end along a winding direction, at least one side surface of a junction of the first pole piece double-sided empty foil area and the first pole piece single-sided empty foil area is covered with a fifth adhesive paper layer, at least one side surface of a junction of the first pole piece single-sided empty foil area and the first pole piece double-sided coating area is covered with a sixth adhesive paper layer, and at least one side surface of a junction of the first pole piece single-sided empty foil area and the first pole piece double-sided empty foil area is covered with a seventh adhesive paper layer.
10. A battery comprising a can and the jellyroll of any of claims 1-9, enclosed within the can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222121661.2U CN218004965U (en) | 2022-08-12 | 2022-08-12 | Roll up core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222121661.2U CN218004965U (en) | 2022-08-12 | 2022-08-12 | Roll up core and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218004965U true CN218004965U (en) | 2022-12-09 |
Family
ID=84321609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222121661.2U Active CN218004965U (en) | 2022-08-12 | 2022-08-12 | Roll up core and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218004965U (en) |
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2022
- 2022-08-12 CN CN202222121661.2U patent/CN218004965U/en active Active
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