CN219800904U - Electrode sheet and battery - Google Patents
Electrode sheet and battery Download PDFInfo
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- CN219800904U CN219800904U CN202320406067.XU CN202320406067U CN219800904U CN 219800904 U CN219800904 U CN 219800904U CN 202320406067 U CN202320406067 U CN 202320406067U CN 219800904 U CN219800904 U CN 219800904U
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Abstract
本实用新型提供一种电极片和电池，该电极片包括极片本体、金属片、极耳，所述极片本体包括集流体，所述集流体包括空箔区；至少部分所述极耳与至少部分所述空箔区的第一表面层叠连接，至少部分所述金属片与至少部分所述空箔区的第二表面层叠连接；所述金属片在极片本体所在平面的正投影位于所述极耳在极片本体所在平面的正投影内；所述空箔区开设有通孔或者缺口；所述金属片与至少部分所述极耳通过所述通孔或者所述缺口电连接。利用通孔或者缺口连接金属片与极耳，实现集流体两侧的导通，有利于电子的输出。
The utility model provides an electrode sheet and a battery. The electrode sheet includes a pole sheet body, a metal sheet, and a pole tab. The pole piece body includes a current collector, and the current collector includes an empty foil area; at least part of the pole tab and At least part of the first surface of the empty foil area is stacked and connected, and at least part of the metal sheet is stacked and connected to at least part of the second surface of the empty foil area; the orthographic projection of the metal sheet on the plane where the pole piece body is located is located where The pole tab is in the orthographic projection of the plane where the pole piece body is located; the empty foil area is provided with a through hole or a gap; the metal sheet and at least part of the pole tab are electrically connected through the through hole or the gap. Use through holes or gaps to connect the metal sheet and the tab to achieve conduction on both sides of the current collector, which is beneficial to the output of electrons.
Description
Technical Field
The utility model belongs to the field of lithium ion batteries, and particularly relates to an electrode plate and a battery.
Background
The lithium ion battery has the advantages of high energy density, high output power, long cycle life, small environmental pollution and the like, and is widely applied to electric automobiles and consumer electronic products. In order to improve the nailing and impact resistance of the cells, those skilled in the lithium battery industry have begun to attempt to convert current collectors from metal foils (e.g., copper foil, aluminum foil) into composite current collectors comprising a support layer and metal layers on both the upper and lower sides of the support layer.
In the related art, the pole piece may include a pole piece body and a tab, where the pole piece body includes a current collector and an active material layer, and in order to improve the charging rate of the battery cell, an empty foil area is generally disposed on the pole piece body, and the tab is welded on one surface of the current collector in the empty foil area. However, the welding difficulty of the electrode lugs and the composite current collector is increased due to the existence of the supporting layer, and meanwhile, conduction of the metal layers on the upper side and the lower side of the supporting layer is difficult to realize due to the existence of the middle supporting layer, so that effective output of electrons cannot be completed.
Disclosure of Invention
The utility model provides an electrode plate, which is conductive to two sides of a current collector by connecting a metal plate with a tab through a through hole or a notch, and is beneficial to outputting electrons.
The utility model also provides a battery, which is beneficial to the electric connection between the tab and an external circuit due to the adoption of the electrode plate.
In one aspect of the utility model, an electrode sheet is provided, which comprises a pole piece body, a metal sheet and a pole lug, wherein the pole piece body comprises a current collector, and the current collector comprises an empty foil area;
at least part of the tabs are connected with at least part of the first surfaces of the empty foil areas in a laminated manner, and at least part of the metal sheets are connected with at least part of the second surfaces of the empty foil areas in a laminated manner;
the orthographic projection of the metal sheet on the plane of the pole piece body is positioned in the orthographic projection of the lug on the plane of the pole piece body;
the empty foil area is provided with a through hole or a notch;
the metal sheet is electrically connected with at least part of the tab through the through hole or the notch.
The electrode sheet as described above, wherein the metal sheet does not protrude from the edge of the electrode sheet body.
The electrode sheet as described above, wherein at least a portion of the through holes or indentations are located in the orthographic projection of the metal sheet on the plane of the electrode sheet body.
The electrode sheet described above, wherein the through hole is located in an edge of the sheet body, and the notch is located at the edge of the sheet body.
The electrode sheet as described above, wherein the tab includes a tab body and a tab extension;
at least part of the tab body is connected with at least part of the first surface lamination of the empty foil area, and the tab extension part extends along the direction deviating from the pole piece body.
The electrode sheet as described above, wherein the metal sheet includes a metal sheet body and a metal sheet connecting portion;
the metal sheet body is connected with the second surface of at least part of the empty foil area in a laminated way, and the metal sheet connecting part is positioned at the notch;
the metal sheet connecting part is connected with at least part of the tab body at the notch.
The electrode plate is characterized in that the orthographic projection area of the notch on the plane of the electrode plate body is A, and the overlapping area of the notch and orthographic projection of the tab body on the plane of the electrode plate body is B, wherein B is more than or equal to 50% A.
The electrode sheet as described above, wherein the dimension of the metal sheet connecting portion in the width direction of the sheet body is not less than 2.5mm; and/or the number of the groups of groups,
the metal sheet connecting part accounts for 50% -70% of the area of the metal sheet.
The electrode slice, wherein the size of the notch in the length direction of the electrode slice body is 50% -150% of the size of the tab in the length direction of the electrode slice body; and/or the number of the groups of groups,
the size of the notch in the width direction of the pole piece body is 3-7 mm.
The electrode plate, wherein the orthographic projection of the through hole on the plane of the electrode plate body is positioned in the orthographic projection of the tab body on the plane of the electrode plate body;
the orthographic projection area of the through hole on the pole piece body is C, and the orthographic projection overlapping area of the pole lug body and the plane where the metal sheet is positioned on the pole piece body is D, C= (30% -50%) D.
The electrode sheet as described above, wherein the shape of the through hole includes at least one of a rectangle, a circle, a trapezoid, a polygon, and an ellipse.
The electrode sheet as described above, wherein the metal sheet has a thickness of 6 to 15 μm.
The electrode sheet as described above, wherein the dimension of the metal sheet in the extending direction of the electrode sheet body is not greater than the dimension of the tab in the extending direction of the electrode sheet body.
An electrode sheet as described above, wherein the current collector further comprises an active layer region;
the empty foil region is located at an end portion of the current collector, or the active layer region is located at least at both sides of the empty foil region in an extending direction of the current collector.
The electrode sheet as described above, wherein the active layer region is provided with an active material layer, and the active material layer is not connected to the through hole; and/or the number of the groups of groups,
the active material layer is not connected with the notch.
The electrode sheet as described above, wherein the current collector includes a first metal layer, a polymer layer, and a second metal layer that are stacked.
In a second aspect of the utility model, there is provided a battery comprising an electrode sheet as described above.
The implementation of the utility model has at least the following beneficial effects:
according to the electrode slice provided by the utility model, the metal sheet is connected with the electrode lugs through the through holes in the empty foil area or the gaps in the electrode slice body, so that the conduction of the two sides of the current collector is realized, and the output of electrons is facilitated.
The battery provided by the utility model is beneficial to the electric connection between the tab and an external circuit due to the adoption of the electrode plate.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic top view of an electrode sheet according to an embodiment of the present utility model;
FIG. 2 is a schematic top view of a second angle of the electrode plate according to an embodiment of the present utility model, the first angle being opposite to the second angle;
FIG. 3 is a schematic side view of a tab of an electrode sheet according to an embodiment of the present utility model;
FIG. 4 is a schematic side view of a tab of an electrode sheet according to another embodiment of the present utility model;
FIG. 5 is a schematic view of a pole piece body according to an embodiment of the present utility model;
FIG. 6 is a schematic top view of a pole piece body according to an embodiment of the present utility model;
FIG. 7 is a schematic top view of a pole piece body according to another embodiment of the present utility model;
FIG. 8 is a schematic top view of a pole piece body according to an embodiment of the present utility model;
fig. 9 is a schematic view of a current collector according to an embodiment of the present utility model.
Reference numerals illustrate:
1-a pole piece body; 2-metal sheets; 3-electrode lugs;
10-current collector; 31-tab body; 32-tab extensions; 21-a sheet metal body; 22-sheet metal connections; 11-a polymer layer; 12-a first metal layer; 13-a second metal layer;
101-empty foil areas;
1011-a first surface; 1012-a second surface; 1013-a through hole; 1014-notch; 1015-connection region.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, "set up" and "connect" may be fixed connection, detachable connection, or integral connection; the connection may be mechanical connection or electrical connection; the above-described specific meanings belonging to the present utility model will be understood in detail by those skilled in the art. The terms "first", "second", etc. are used for descriptive purposes only, e.g. to distinguish between components, to more clearly illustrate/explain the solution.
Referring to fig. 1 to 9, the X direction is the length direction of the pole piece body, the Y direction is the width direction of the pole piece body, and the Z direction is the thickness direction of the pole piece body.
The electrode plate provided by the utility model comprises a plate body 1, a metal plate 2 and a lug 3, wherein the plate body 1 comprises a current collector 10, and the current collector 10 comprises an empty foil area 101; at least part of the tab 3 is in laminated connection with at least part of the first surface 1011 of the hollow foil region 101 and at least part of the metal sheet 2 is in laminated connection with at least part of the second surface 1012 of the hollow foil region 101; the orthographic projection of the metal sheet 2 on the plane of the pole piece body 1 is positioned in the orthographic projection of the lug 3 on the plane of the pole piece body 1; the hollow foil area 101 is provided with a through hole 1013 or a notch 1014; the metal sheet 2 is electrically connected to at least part of the tab 3 through the through hole 1013 or the notch 1014.
The specific shapes of the pole piece body 1, the metal sheet 2 and the pole lug 3 are not limited excessively, and the pole piece can be of a rectangular strip-shaped structure which is conventional in the field.
In the utility model, the pole piece body 1 at least comprises a current collector 10, and the current collector 10 is divided into an active layer area 102 and an empty foil area 101 according to whether an active substance layer is arranged or not, wherein the active layer area 102 is used for coating an active substance layer, and the area where the active substance layer is not arranged is the empty foil area 101.
In the present utility model, the blank foil area 101 comprises oppositely arranged surfaces. At this time, the empty foil area is provided on both sides, and the surfaces are the largest and opposite surfaces of the empty foil area 101, namely the first surface 1011 and the second surface 1012, which are both exposed from the current collector, so as to form the empty foil area 101.
The first surface 1011 is connected to the tab 3, and at least a part of the tab 3 is stacked on the first surface 1011 exposed by at least a part of the empty foil region 101. The pole lug 3 electrically connects the pole piece body 1 with an external circuit, and the connection between the pole lug 3 and the pole piece body 1 can be realized through the connection between the pole lug 3 and the first surface 1011; with the second surface 1012 being connected to the metal sheet 2, at least part of the metal sheet 2 is now in a laminated connection with the second surface 1012 of at least part of the empty foil area. The connection manner of the tab 3, the metal sheet 2 and the empty foil region 101 is not limited in the present utility model, and may be, for example, welding. The solder marks formed by the welding can penetrate or not penetrate through the tab 3, the metal sheet 2 and the empty foil area 101, so long as the connection is ensured.
The present utility model is not limited to the above welding method, and examples thereof include ultrasonic welding and laser welding. In the welding, the welding along the surface of the tab 3 away from the current collector may be selected, or the welding along the surface of the metal sheet 2 away from the current collector may be selected. In one embodiment, as shown in fig. 1, the welding marks formed by welding form a connection region 1015 on the surface of the tab 3 remote from the current collector.
The orthographic projection of the metal sheet 2 on the plane of the pole piece body 1 is positioned in the orthographic projection of the lug 3 on the plane of the pole piece body 1. That is, the edge of the orthographic projection of the metal sheet 2 on the plane of the pole piece body 1 does not exceed the orthographic projection of the tab 3 on the plane of the pole piece body 1.
When the hollow foil region 101 is provided with the through hole 1013, the through hole 1013 penetrates the hollow foil region 101 along the thickness direction of the pole piece body, and at this time, the metal piece 2 and at least part of the tab 3 are electrically connected through the through hole 1013. As shown in fig. 6 and 7, the through hole 1013 is located in the edge of the pole piece body 1.
When the pole piece body 1 is provided with a notch 1014 near the empty foil area 101, the notch 1014 is located in the pole piece body 1 and is connected with the empty foil area 101. The shape and position of the notch 1014 are not excessively limited in the utility model, so long as the notch 1014 is ensured to be positioned in the pole piece body 1, and the notch 1014 is connected with the empty foil area 101. For example, as shown in fig. 1, 2, 5, the notch 1014 is located at an edge of the pole piece body 1 in the length direction thereof.
The electrode plate can not only enable the electrode lug 3 and the empty foil area 101 to be fixed, but also enable the first surface 1011 and the second surface 1012 of the empty foil area to be conducted, namely enable the surfaces on the two sides of the current collector to be conducted, and is beneficial to effective output of electrons.
Besides helping to improve the battery performance by realizing the conduction of the two sides of the current collector 10, it is worth mentioning that the electrode plate with the structure can obviously improve the battery yield and is suitable for batch manufacturing of lithium ion batteries. The electrode plate provided by the utility model can realize conduction of two sides of the current collector by only connecting the metal plate 2 with the electrode lug 3 through the through hole 1013 or the notch 1014 on the premise of keeping the original shape structure of the electrode lug 3, and compared with the prior art, the electrode plate provided by the utility model can be connected with the electrode lug 3 first and then connected with the metal plate 2, and the current collector 10 is not easy to damage by adopting a single connection mode, and the production flow is simple. Therefore, the utility model provides a production technology of electrode slice is simple, and the yield is high, helps promoting the security performance of battery and helps realizing the batch production of electrode slice.
The hollow foil region 101 has two edges disposed opposite to each other in parallel to the longitudinal direction of the pole piece body 1, and the vertical distance between the two edges is the dimension of the current collector 10 in the width direction. The hollow foil area 101 may communicate with at least one edge, i.e. form an opening.
The size of the metal sheet 2 is not limited too much, so long as the metal sheet 2 and at least part of the tab 3 are connected through the through hole 1013 or the notch 1014. In an embodiment, the metal sheet 2 does not protrude from the edge of the pole piece body 1, that is, the orthographic projection of the metal sheet 2 on the pole piece body 1 is located in the pole piece body 1, which is beneficial to saving the battery space and exerting the performance of the battery to the maximum.
The size of the through hole 1013 or the notch 1014 is not excessively limited in the present utility model, so long as the metal sheet 2 and at least part of the tab 3 are connected through the through hole or the notch. In one embodiment, at least part of the through hole 1013 or the notch 1014 is located in the front projection of the metal sheet 2 in the plane of the pole piece body 1, and in a preferred embodiment, the front projection of the through hole 1013 or the notch 1014 in the pole piece body 1 is located in the front projection of the metal sheet 2 in the plane of the pole piece body 1, which is beneficial to saving the battery space and maximizing the performance of the battery.
The tab 3 is not excessively limited in the present utility model, and may be a conventional tab in the art. For example, the tab 3 includes a tab body 31 and a tab extension 32; at least part of the tab body 31 is in laminated connection with at least part of the first surface 1011 of the hollow foil region 101, the tab extension 32 extending in a direction away from the pole piece body 1.
Specifically, the tab 3 is divided into a tab body 31 and a tab extension 32 in the width direction of the pole piece body 1. The part of the tab 3 located in the pole piece body 1 is a tab body 31, and the part of the tab 3 extending from the pole piece body 1 is a tab extension 32.
The connection between the tab 3 and the pole piece body 1 can be achieved by connecting the tab body 1 with the empty foil region 101. At this time, the tab body 1 is stacked on the first surface 1011 exposed by the dummy foil region 101. The connection mode of the tab body 1 and the empty foil area 101 is not limited in the present utility model, for example, ultrasonic welding, laser welding, etc.
The tab extension 32 extends beyond the edge of the pole piece body 1, and is connected with an external circuit through the tab extension 32, so that the pole piece body 1 can be electrically connected with the external circuit.
The shape and the structure of the metal sheet are not excessively limited, so long as the metal properties of the metal sheet 2 are ensured. In one embodiment, referring to fig. 1, 2 and 3, the metal sheet 2 includes a metal sheet body 21 and a metal sheet connecting portion 22; the sheet metal body 21 is laminated to the second surface 1012 of at least a portion of the blank foil area, with the sheet metal connection 22 being located at the notch 1014; the sheet metal connecting portion 22 is connected to at least part of the tab body 1 at the notch 1014.
Specifically, the metal sheet 2 may be divided into a metal sheet body 21 and a metal sheet connection portion 22 according to the connection body, wherein the metal sheet body 21 is for lamination connection with the second surface 1012 of the empty foil region, and the metal sheet connection portion 22 is for connection with the tab 3.
The metal sheet connecting portion 22 is located at the notch 1014, so that the metal sheet connecting portion 22 and at least part of the tab 3 can be connected at the notch 1014.
Further, depending on the connection body, the tab body 31 may be divided into a first body portion 301 and a second body portion 302, where the first body portion 301 is used for lamination connection with the first surface 1011 of the empty foil region, and the second body portion 302 is used for connection with the sheet metal connection portion 22 at the notch.
In order to ensure that the second body portion 302 is connected to the sheet metal connecting portion 22 at the notch, at least part of the second body portion 302, at least part of the sheet metal connecting portion 22, and at least part of the notch 1014 are correspondingly disposed, that is, there is an overlapping area between the three on the orthographic projection of the plane in which the pole piece body 1 is located.
In one embodiment, the orthographic projection area of the notch 1014 on the plane of the pole piece body 1 is A, and the overlapping area of the orthographic projection of the notch 1014 and the tab body 31 on the plane of the pole piece body 1 is B, wherein B is greater than or equal to 50% A.
The shape and size of the metal sheet 2 are not excessively limited in the present utility model, so long as the above connection is ensured. In one embodiment, as shown in fig. 3, the dimension L2 of the sheet metal connecting portion 22 in the width direction of the pole piece body 1 is not less than 2.5mm; the metal sheet connecting portion 22 occupies 50% -70% of the area of the metal sheet 2.
Taking the example that the notch 1014 is located at the edge of the pole piece body 1, the metal connecting portion 22 does not protrude from the upper edge of the notch 1014 (also the edge of the pole piece body 1), and at the same time, the upper edge of the metal connecting portion 22 is at least 2.5mm higher than the lower edge of the notch.
The area of the metal sheet 2 is the sum of the areas of the metal sheet body 21 and the metal sheet connecting portion 22, and the metal connecting portion 22 occupies 50% -70% of the area of the metal sheet 2, and at this time, the metal connecting portion 22 may be used for connecting with the tab body 31 entirely.
The shape and size of the notch 1014 are not excessively limited in the present utility model, so long as the notch 1014 is ensured to be located in the pole piece body 1. In one embodiment, the dimension W1 of the notch 1014 in the length direction of the pole piece body is 50% -150% of the dimension W3 of the tab in the length direction of the pole piece body; the dimension L1 of the notch 1014 in the width direction of the pole piece body 1 is 3 to 7mm.
Illustratively, the dimension W1 of the notch 1014 in the length direction of the pole piece body 1 is 2 to 3mm greater than the dimension W3 of the tab 3 in the length direction of the pole piece body 1, i.e., w1—w3=2 to 3mm.
In another embodiment, referring to fig. 4, the orthographic projection of the through hole 1013 on the plane of the pole piece body 1 is located in the orthographic projection of the tab body 31 on the plane of the pole piece body 1; the orthographic projection area of the through hole 1013 on the plane of the pole piece body 1 is C, and the overlapping area of the orthographic projection of the tab body 31 and the metal layer 2 on the plane of the pole piece body 1 is D, c= (30% -50%) D.
The present utility model does not excessively limit the shape of the through hole 1013, and the shape of the through hole 1013 includes at least one of a rectangle, a circle, a trapezoid, a polygon, and an ellipse, for example. That is, through holes can be observed at both end surfaces in the thickness direction of the current collector 10, and the observed shape of the through holes 1013 may be rectangular, circular, trapezoidal, polygonal, elliptical, or the like. For example, as shown in fig. 6, the shape of the through hole 1013 is rectangular, and as shown in fig. 7, the shape of the through hole 1013 is circular. When the shape of the through hole 1013 is a circle, the aperture is 2 to 4mm.
The utility model does not limit the size of the metal sheet 2 too much, and can be adjusted according to actual conditions. For example, the thickness of the metal sheet 2 is 6-15 μm, which is advantageous for the flatness of the battery cell. This is because the welding of the two side tabs at the same time of the bifurcated tab in the prior art easily causes an increase in thickness at the position, and even causes a total thickness of the tab to be higher than that of the active material layer, which causes the position to protrude from the electrode sheet, and eventually causes a problem that the battery core is rugged or poor in interface adhesion. In the electrode plate structure provided by the utility model, the metal plate with the thickness is adopted, the thickness of the electrode lug position is not increased due to the fact that the metal plate 2 is thinner, the problem that the total thickness of the electrode lug position is higher than that of the active material layer is avoided, and therefore the flatness of the thickness of the battery cell is facilitated.
In one embodiment, the dimension of the metal sheet 2 in the extending direction of the pole piece body 1 is not greater than the dimension of the tab 3 in the extending direction of the pole piece body 1. The extending direction of the pole piece body 1 refers to the width direction and the length direction of the pole piece body 1. For example, the dimension W2 of the metal sheet 2 in the length direction of the pole piece body 1 is equal to the dimension W3 of the tab body 31 in the length direction of the pole piece body 1, or the dimension W2 of the metal sheet 2 in the length direction of the pole piece body 1 is smaller than 1 to 2mm of the dimension W3 of the tab body 31 in the length direction of the pole piece body; the dimension of the metal sheet 2 in the width direction of the pole piece body 1 is equal to the dimension of the tab body 31 in the width direction of the pole piece body 1, or the dimension L2 of the metal sheet 2 in the width direction of the pole piece body 1 is smaller than the dimension 2-3 mm of the tab body 31 in the width direction of the pole piece body 1.
In the above electrode sheet, the current collector 10 further includes an active layer region, and the active layer region of the current collector 10 is used for providing an active material layer. The empty foil region 101 is located at an end portion of the current collector, or the active layer regions are located at least at both sides of the empty foil region in the extending direction of the current collector.
As shown in fig. 8, when the empty foil region 101 is located at the end position of the current collector 10, the empty foil region 101 may be provided only at one end in the length direction of the current collector 10, or may be provided at both ends in the length direction of the current collector 10, respectively.
As shown in fig. 1, 2, 5, 6, and 7, when the active layer region is located on at least two sides of the empty foil region 101 in the extending direction of the pole piece body 1, that is, in the extending direction of the pole piece body 1, the active layer region is adjacent to at least two sides of the empty foil region 101, wherein the extending direction of the pole piece body 1 refers to the length direction of the pole piece body 1 and the width direction of the pole piece body.
Illustratively, in one embodiment, the active layer region comprises first and second portions that are not adjacent to each other in the length direction of the pole piece body 1, with the empty foil region 101 located between the first and second portions; in another embodiment, the active layer region comprises a first portion and a second portion connected in the length direction of the pole piece body 1, wherein the empty foil region 101 is located between the first portion and the second portion, and the connection region of the first portion and the second portion is located at one side of the empty foil region in the width direction of the pole piece body.
In the utility model, an active material layer is arranged in the active layer area, and the active material layer is not connected with the through hole; and/or the active material layer is not contiguous with the gap. The active layer region is used for coating the active material layer, and in order to ensure the stability of the active material layer, the active material layer is not connected with the notch as shown in fig. 1, 2 and 5. As shown in fig. 6 and 7, the active material layer is not connected to the through hole.
The current collector 10 of the present utility model may be a composite current collector, for example, referring to fig. 9, the current collector 10 includes a first metal layer 12, a polymer layer 11 and a second metal layer 13 stacked together, i.e. the first metal layer 12 and the second metal layer 13 are disposed opposite to each other. In general, in the electrode sheet, the active material layer may be coated on only the surface of the first metal layer or the surface of the second metal layer of the current collector, or may be coated on both the surfaces of the first metal layer and the second metal layer of the current collector 10. At this time, the first metal layer surface is the first surface 1011 of the current collector, and the second metal layer surface is the second surface 1012 of the current collector.
The specific materials of the first metal layer 12, the polymer layer 11 and the second metal layer 13 are not limited in the present utility model. Exemplary materials of the polymer layer include organic polymer materials such as polyethylene terephthalate, materials of the first metal layer include copper or aluminum, materials of the second metal layer include copper or aluminum, materials of the first metal layer and the second metal layer are the same, and a composite current collector formed by the materials can improve safety performance of the electrode plate.
The electrode sheet may be a negative electrode sheet or a positive electrode sheet, and the materials of the tab 3, the current collector 10, and the respective active material layers may be specifically determined according to specific selection of the electrical properties of the electrode sheet. For example, when the electrode sheet is a positive electrode sheet, the first metal layer and the second metal layer of the current collector 10 are aluminum, the material of the active material layer is a ternary material or a positive electrode active material such as lithium iron phosphate, and the material of the tab is aluminum; when the electrode plate is a negative electrode plate, the first metal layer and the second metal layer of the current collector are copper, the active material layer is made of negative electrode active materials such as graphite, silicon base and the like, and the lug is made of nickel.
The battery provided by the utility model comprises the electrode plate. For example, the battery comprises N positive plates and M negative plates which are sequentially stacked, wherein a diaphragm is arranged between every two adjacent positive plates and negative plates and is used for preventing the positive plates and/or the negative plates from contacting with each other to cause short circuit of the battery.
The battery may be a wound battery and a stacked battery. The positive electrode sheet, the separator, and the negative electrode sheet, which are in a stacked state in the wound battery, are wound to be built in the case, and the positive electrode sheet, the separator, and the negative electrode sheet, each of which is cut to a predetermined size, are stacked in the stacked battery.
According to the battery provided by the utility model, the electrode plate is adopted, so that the first metal layer and the second metal layer of the current collector can be conducted, the electric connection between the electrode lug and an external circuit is facilitated, the output of current in the battery is effectively ensured, and the safety performance and the charge-discharge performance of the battery can be improved.
The utility model is further illustrated by the following examples.
The lithium ion batteries of the following examples and comparative examples were prepared as follows:
(1) Negative electrode slurry: adding artificial graphite, conductive carbon black, styrene-butadiene rubber and sodium carboxymethylcellulose into a stirring tank according to the mass ratio of 96.9:1.5:1.3:13, adding deionized water solvent, fully stirring, and passing through a 150-mesh screen to prepare negative electrode slurry, wherein the solid content of the negative electrode slurry is 40% -45%;
(2) Coating a negative electrode: coating the negative electrode slurry on a negative electrode current collector by using a coating machine, drying at 100 ℃, and then rolling and slitting the negative electrode plate to obtain the negative electrode plate with the required size;
(3) Positive electrode slurry: lithium cobaltate, conductive agent and binder according to 97.2:1.5:1.3, adding NMP solvent into a stirring tank, fully stirring, sieving with a 200-mesh sieve to prepare positive electrode slurry, wherein the solid content of the positive electrode slurry is 70-75%,
(4) Coating a positive electrode: coating the positive electrode slurry on a positive electrode current collector by using a coating machine, drying at 120 ℃, and then rolling and slitting the positive electrode plate to obtain the positive electrode plate with the required size;
(5) A diaphragm: polyethylene is used as a diaphragm base film, the thickness is 5 mu m, and the two sides are coated with alumina ceramic and PVDF glue mixture; its areal density is 3.5g/m 2 ；
(6) Assembling an electric core: and (3) winding the positive plate, the negative plate and the diaphragm prepared in the step (1) and the step (5) together to form a winding core, packaging the winding core by an aluminum plastic film, baking to remove water, injecting electrolyte, and performing thermocompression forming process to obtain the battery core.
The preparation process of the electrolyte comprises the following steps: adding LiPF into a solvent formed by mixing Propylene Carbonate (PC), ethylene Carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) according to a weight ratio of about 1:1:0.5:1 6 Uniformly mix, wherein LiPF 6 The concentration of (2) is about 1mol/L, and the electrolyte is obtained by uniformly mixing.
Example 1
When the positive current collector is a plastic current collector plated with an aluminum metal layer
In the embodiment, the positive plate structure is a middle-arranged structure of the electrode lug, namely the electrode lug is welded at a certain position in the middle of the electrode plate, the electrode lug is welded to clean an electrode lug groove, the width of the electrode lug groove is 20mm, and the length of the electrode lug groove is 30mm; the upper edge of the tab slot is the edge of the pole piece body, a rectangular notch is formed in the upper edge of the tab slot, the size of the notch in the length direction of the pole piece body is 8mm, and the size in the width direction of the pole piece body is 5mm;
the width of the tab is 6mm, the length is 25mm, the tab is welded on any side of the tab slot of the current collector, the tab is welded in the middle of the notch, and 1mm gaps are respectively arranged on the left and right sides;
sticking a layer of aluminum metal sheet with the thickness of 10 mu m on the other side of the current collector; the length of the metal sheet is 25mm, the width of the metal sheet is 5mm, one end of the metal sheet is connected with the plastic current collector plated with the aluminum metal layer, one end of the metal sheet is connected with the tab through the notch, and the length of the metal sheet connected with the tab is 5mm, so that the positive electrode sheet of the embodiment is obtained.
Example 2
When the negative current collector is a plastic current collector plated with a copper metal layer,
in the embodiment, the structure of the negative electrode plate is a middle-arranged structure of the electrode plate, namely, the electrode plate is welded at a certain position in the middle of the electrode plate, the electrode plate is welded at a position where cleaning is needed, the width of the electrode plate is 20mm, and the length of the electrode plate is 30mm; the upper edge of the tab slot is a pole piece edge, a rectangular notch is formed in the upper edge of the tab slot, the size of the notch in the length direction of the pole piece body is 8mm, and the size in the length direction of the pole piece body is 5mm;
the width of the tab is 6mm, the length is 25mm, the tab is welded on any side of the tab slot of the current collector, the tab is welded in the middle of the notch, and 1mm gaps are respectively arranged on the left and right sides;
a copper metal sheet with the thickness of 10 mu m is stuck on the other side of the current collector; the length of the metal sheet is 25mm, the width of the metal sheet is 5mm, one end of the metal sheet is connected with the plastic current collector plated with the aluminum metal layer, one end of the metal sheet is connected with the tab through the notch, and the length of the metal sheet connected with the tab is 5mm, so that the negative electrode sheet of the embodiment is obtained.
Example 3
The positive plate structure is a conventional structure, the tab is welded at the head blank area of the plate, and the other operations are the same as those of the embodiment 1.
Example 4
The negative electrode sheet structure is a conventional structure, and the tab is welded at the head blank area of the electrode sheet, and the other operations are the same as those of embodiment 1.
It should be noted that, the numerical values and the numerical ranges related to the embodiments of the present utility model are approximate values, and may have a certain range of errors under the influence of the manufacturing process, and those errors may be considered to be negligible by those skilled in the art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
The embodiments of the present utility model have been described above. However, the present utility model is not limited to the above embodiment. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The electrode plate is characterized by comprising a pole plate body, a metal plate and a pole lug, wherein the pole plate body comprises a current collector, and the current collector comprises an empty foil area;
the current collector is provided with a first metal layer, a polymer layer and a second metal layer which are arranged in a laminated manner;
at least part of the tabs are connected with at least part of the first surfaces of the empty foil areas in a laminated manner, and at least part of the metal sheets are connected with at least part of the second surfaces of the empty foil areas in a laminated manner;
the orthographic projection of the metal sheet on the plane of the pole piece body is positioned in the orthographic projection of the lug on the plane of the pole piece body;
the empty foil area is provided with a through hole or a notch;
the metal sheet is electrically connected with at least part of the tab through the through hole or the notch.
2. The electrode tab of claim 1 wherein the metal tab does not protrude beyond the edge of the tab body.
3. An electrode sheet according to claim 1, wherein at least part of the through holes or indentations are located in the orthographic projection of the metal sheet in the plane of the sheet body.
4. The electrode tab of any one of claims 1-3, wherein the tab comprises a tab body and a tab extension;
at least part of the tab body is connected with at least part of the first surface lamination of the empty foil area, and the tab extension part extends along the direction deviating from the pole piece body.
5. The electrode tab of claim 4, wherein the metal tab comprises a metal tab body and a metal tab connection;
the metal sheet body is connected with the second surface of at least part of the empty foil area in a laminated way, and the metal sheet connecting part is positioned at the notch;
the metal sheet connecting part is connected with at least part of the tab body at the notch or the through hole.
6. The electrode slice according to claim 5, wherein the orthographic projection area of the notch on the plane of the electrode slice body is A, and the overlapping area of the orthographic projection of the notch and the tab body on the plane of the electrode slice body is B, wherein B is more than or equal to 50% A; and/or the number of the groups of groups,
the size of the notch in the length direction of the pole piece body is 50% -150% of the size of the pole lug in the length direction of the pole piece body; and/or the number of the groups of groups,
the size of the notch in the width direction of the pole piece body is 3-7 mm; and/or the number of the groups of groups,
the dimension of the metal sheet connecting part in the width direction of the pole piece body is not less than 2.5mm; and/or the number of the groups of groups,
the metal sheet connecting part accounts for 50% -70% of the area of the metal sheet.
7. The electrode tab of claim 4, wherein the orthographic projection of the through hole on the plane of the electrode tab body is located in the orthographic projection of the tab body on the plane of the electrode tab body;
the orthographic projection area of the through hole on the plane of the pole piece body is C, and the orthographic projection overlapping area of the lug body and the plane of the metal layer on the pole piece body is D, C= (30% -50%) D.
8. The electrode sheet according to claim 1, wherein the metal sheet has a thickness of 6 to 15 μm.
9. The electrode tab of claim 1 wherein the current collector further comprises an active layer region, the active layer region being provided with an active material layer,
the active material layer is not connected with the through hole; and/or the number of the groups of groups,
the active material layer is not connected with the notch.
10. A battery comprising the electrode sheet of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320406067.XU CN219800904U (en) | 2023-03-06 | 2023-03-06 | Electrode sheet and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320406067.XU CN219800904U (en) | 2023-03-06 | 2023-03-06 | Electrode sheet and battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025220215A1 (en) * | 2024-04-19 | 2025-10-23 | ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 | Secondary battery |
| WO2025220213A1 (en) * | 2024-04-19 | 2025-10-23 | ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 | Secondary battery |
-
2023
- 2023-03-06 CN CN202320406067.XU patent/CN219800904U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025220215A1 (en) * | 2024-04-19 | 2025-10-23 | ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 | Secondary battery |
| WO2025220213A1 (en) * | 2024-04-19 | 2025-10-23 | ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 | Secondary battery |
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