CN215911557U - Battery core pole piece, battery core pole group and battery core - Google Patents

Abstract

The utility model discloses a battery cell pole piece, a battery cell pole group with the battery cell pole piece and a battery cell, wherein the battery cell pole piece comprises: the pole piece comprises a pole piece body, a first tab and a second tab, wherein the pole piece body comprises a current collector and an active substance arranged on the surface of the current collector; the first tab is connected with the first end of the current collector; the second utmost point ear is connected the second of mass flow body is held, wherein, first utmost point ear with the second utmost point ear all include the coupling part and with the electrode part that the coupling part links to each other, the coupling part with the mass flow body links to each other. By applying the technical scheme, the internal resistance of the battery core pole piece can be reduced, so that the effect of reducing the internal resistance of the battery is realized, the high-rate charging performance of the battery is improved, and the service life of the battery is prolonged; the condition of lithium precipitation at the end part of the long battery cell cathode can be improved, and the use safety of the battery cell is improved.

Description

Battery core pole piece, battery core pole group and battery core

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell pole piece and a battery cell pole group with the battery cell pole piece, namely a battery cell with the battery cell pole piece.

Background

Along with the increasing awareness of environmental protection, electric vehicles are more and more emphasized by people, and as electric vehicles are still under development, the popularization of electric vehicles still faces some problems, mainly the mileage is short, and secondly the charging time is long. This is limited mainly by two technical factors, one is the energy density of the battery; secondly, the battery has high-rate charging capability.

Aiming at the improvement of the energy density of the battery, the specific capacity of the raw material is improved, and a novel material is researched and developed. And the space utilization rate is improved, namely more batteries are placed in the vehicle. Because the research and development of new materials can be completed in no time, the energy density of the battery pack is mainly improved by improving the space utilization rate in recent years, so that the capacity and the volume of the single battery are increased, the number of modules is reduced, even the modules are cancelled, the battery is formed into a long strip shape, and the battery is directly transversely placed in the battery pack. The module is cancelled except that promoting space utilization, can also reduce the cost of battery package, so rectangular electricity core design is a very ideal scheme, but all have advantages and disadvantages, according to ohm law, the electricity core is longer, and the battery internal resistance is higher, all plays negative effects to the big multiplying power charging performance of battery, even cycle life.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a cell pole piece, which can reduce the internal resistance of the cell pole piece, thereby reducing the internal resistance of the battery, so as to improve the high-rate charging performance of the battery and prolong the service life.

Another object of the present invention is to provide a battery cell pole group.

It is a further object of the present invention to provide a battery cell.

The battery cell pole piece according to the embodiment of the utility model comprises: the pole piece comprises a pole piece body, a first tab and a second tab, wherein the pole piece body comprises a current collector and an active substance arranged on the surface of the current collector; the first tab is connected with the first end of the current collector; the second utmost point ear is connected the second of mass flow body is held, wherein, first utmost point ear with the second utmost point ear all include the coupling part and with the electrode part that the coupling part links to each other, the coupling part with the mass flow body links to each other.

According to the battery cell pole piece disclosed by the embodiment of the utility model, the internal resistance of the battery cell pole piece can be reduced, so that the effect of reducing the internal resistance of a battery is realized, the high-rate charging performance of the battery is improved, and the service life is prolonged; the condition of lithium precipitation at the end part of the long battery cell cathode can be improved, and the use safety of the battery cell is improved.

In addition, the cell pole piece according to the above embodiment of the present invention may also have the following additional technical features:

in some embodiments, the first tab, the second tab, and the current collector are a split structure.

In some embodiments, the first end and the second end of the current collector are respectively provided with a blank area without an active material, the first tab is connected with the blank area of the first end of the current collector, and the second tab is connected with the blank area of the second end of the current collector.

In some embodiments, the first tab is welded to the first end of the current collector, and the second tab is welded to the second end of the current collector.

In some embodiments, the thickness of the first and second tabs is not less than the thickness of the current collector.

In some embodiments, the thickness of the first and second tabs is no greater than the thickness of the pole piece body.

In some embodiments, both sides of the connecting portion of the first tab are not shorter than both sides of the first end of the current collector, and both sides of the connecting portion of the second tab are not shorter than both sides of the second end of the current collector.

In some embodiments, the electrode portions of the first and second tabs are staggered and do not overlap in a projection along the extension direction of the current collector.

In some embodiments, a dimension of the connection portion of the first tab and the second tab in the extending direction of the current collector is not less than a thickness of the current collector.

The battery cell pole group comprises a positive pole piece and a negative pole piece, wherein the positive pole piece and the negative pole piece respectively comprise the battery cell pole pieces, the positive pole piece and the negative pole piece are arranged in a laminated mode, a first tab on the positive pole piece and a first tab on the negative pole piece are located at the same end of the battery cell pole group, the electrode parts of the first tab and the second tab on the positive pole piece are staggered, and the second tab on the positive pole piece and the second tab on the negative pole piece are located at the same end of the battery cell pole group, and the electrode parts of the second tab and the second tab on the negative pole piece are staggered.

According to the battery cell pole group provided by the embodiment of the utility model, the internal resistance of the pole piece can be reduced, so that the effect of reducing the internal resistance of the battery is realized, the high-rate charging performance of the battery is improved, the service life is prolonged, and the problems of lithium precipitation at the end part of a negative electrode and the like caused by uneven impedance at two ends of a long battery cell are solved.

According to the battery cell provided by the embodiment of the utility model, the battery cell comprises a plurality of battery cell pole pieces, and the battery cell pole pieces are the battery cell pole pieces and are arranged in a laminated manner.

According to the battery cell provided by the embodiment of the utility model, the problems of short service life of long-battery-cell high-rate charge and discharge and battery high-rate charge heating are solved, and the problems of lithium precipitation at the end part of a negative electrode and the like caused by uneven impedance at two ends of the long battery cell are also solved.

Drawings

Fig. 1 is a schematic structural diagram of a cell pole piece in an embodiment of the present invention.

Fig. 2 is an enlarged view of box a in fig. 1.

Fig. 3 is a schematic structural view of a current collector in an embodiment of the present invention.

Fig. 4 is a schematic view of a current collector coated with an active material in an embodiment of the present invention.

Fig. 5 is a schematic view of a welding process of a pole piece body and a tab in an embodiment of the utility model.

Fig. 6 is a schematic diagram of a pole piece body after welding of a first tab and a second tab is completed according to an embodiment of the utility model.

Fig. 7 is a schematic structural diagram of a cell pole group in an embodiment of the present invention.

Fig. 8 is a schematic structural view of a positive electrode sheet in an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a negative electrode sheet in an embodiment of the utility model.

Fig. 10 is a schematic structural diagram of a cell pole piece in the related art.

Fig. 11 is a schematic structural diagram of a cell pole piece in the related art.

Fig. 12 is a schematic structural diagram of a cell pole group in the related art.

Reference numerals:

a battery core pole piece 10, a pole piece body 11, a current collector 111, an active material 112, a first end 101, a second end 102, a first tab 12, a second tab 13,

a cell pole group 100, a positive plate 10P, a positive plate body 11P, a first positive pole tab 12P, a second positive pole tab 13P, a negative plate 10N, a negative plate body 11N, a first negative pole tab 12N, a second negative pole tab 13N,

an ultrasonic seam welder 200.

Pole piece 1 ', positive terminal 11 ', negative terminal 12 ', tab 2 ', positive tab 21 ', negative tab 22 ', and separator 3 '.

Detailed Description

Referring to fig. 10 to 12, in the related art, the total length of the elongated cells is close to the width of the battery pack, which is more than 5 times the length of the current common battery, and the width of the cells is almost the same as the current common battery (smaller than the height of the battery pack). The internal resistance of the battery is in a direct proportion relation with the length of the pole piece, so that the path of the current in the battery passing through the pole piece is multiplied by the overlong battery, and the internal resistance of the battery is also multiplied by the same. The increase of the internal resistance has negative effects on the service life of the battery, high-rate charge and discharge, the temperature rise of the battery, low-temperature discharge and lithium precipitation.

In order to reduce the internal resistance of a long battery, the method adopted in the industry is to fully widen the width of a tab 2 '(the tab width is consistent with the width of a pole piece, the tabs can only be respectively placed at two ends of a pole group, commonly called a full tab pole group structure or a tab structure at two ends) so as to reduce the overcurrent bottleneck brought by the tab 2'. Combining fig. 10 and fig. 11, wherein fig. 10 shows the cell pole pieces before widening the tabs; fig. 11 shows the cell pole pieces after widening the tabs. Although the resistance at the position of the tab 2 'and the heating of the tab can be relieved by widening the tab, the length of the pole piece 1' of the structure is not changed, and the distance of current passing through the pole piece is not shortened, so that the internal resistance of the pole piece is not changed, and the problems of high-rate charging and discharging performance reduction, cycle life reduction and charging and discharging heating caused by high internal resistance of the battery body cannot be fundamentally solved.

In addition to the above problems, the pole group structure with the tabs 2 ' at both ends has the problem of pole piece impedance mismatch between the pole piece region of the negative terminal 12 ' and the region near the positive tab 21 '. The main reason is that the negative pole piece tail end 12' (namely the utmost point ear is farthest and the impedance of the negative pole is highest) corresponds to the lug nearby area (the impedance of the positive pole piece is lowest) of the adjacent positive pole piece, and in the process of charging the battery, because the part with high negative pole impedance corresponds to the part with low positive pole impedance, the potential of the negative pole to Li is reduced rapidly in the charging process, and particularly lithium dendrites are easily generated at the negative pole tail end in the high-rate charging process, so that great potential safety hazards are caused to the battery.

Therefore, the utility model provides a battery cell pole piece 10, which can reduce the internal resistance of the battery cell pole piece 10, further realize the effect of reducing the internal resistance of the battery, improve the high-rate charging performance of the battery, prolong the service life, and solve the problems of lithium precipitation at the end part of a negative electrode and the like caused by uneven impedance at two ends of a long battery cell.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

With reference to fig. 1, a cell pole piece 10 according to an embodiment of the present invention includes: the battery cell pole piece comprises a pole piece body 11, a first pole lug 12 and a second pole lug 13, wherein the pole piece body 11 specifically comprises a current collector 111 and an active substance 112 arranged on the surface of the current collector, so that currents are collected to form larger currents to be output outwards, and the performance of the battery cell pole piece 10 is improved; the first tab 12 is connected with the first end 101 of the current collector 111; the second tab 13 is connected to the second end 102 of the current collector 111, wherein each of the first tab 12 and the second tab 13 includes a connection portion and an electrode portion connected to the connection portion, and the connection portion is connected to the current collector 111. That is, the first tab 12 and the second tab 13 are both formed by a connection portion and an electrode portion, and the first tab 12 and the second tab 13 are respectively connected to two ends of the pole piece body 11, so that current can respectively flow through the first tab 12 connected to the first end 101 of the current collector 111 and the second tab 13 connected to the second end 102 of the current collector 111, thereby reducing the distance of the current passing through the pole piece and further reducing the internal resistance of the cell pole piece 10 itself.

According to the cell pole piece 10 provided by the embodiment of the utility model, the first tab 12 and the second tab 13 composed of the connection part and the motor part are respectively connected to the first end 101 and the second end 102 of the current collector 111, so that a composite tab is constructed, the internal resistance of the cell pole piece 10 can be reduced, the effect of reducing the internal resistance of the battery is further realized, the high-rate charging performance of the battery is improved, and the service life is prolonged. In addition, the resistance of the battery cell pole piece 10 is reduced, and the negative impedance can be properly reduced, so that the lithium precipitation condition of the battery cell negative electrode is improved, and the use safety of the battery cell is improved.

The pole piece body 11, the first tab and the second tab of the present invention have various different manufacturing forms, for example, the current collector 111 may be integrally formed or separately formed with the first tab 12, and the current collector 111 may also be integrally formed or separately formed with the second tab 13.

In some embodiments of the present invention, the first tab 12, the second tab 13 and the current collector 111 are in a split structure, that is, the current collector 111, the first tab 12 and the second tab 13 are assembled together after being separately produced, and the first tab 12 and the second tab 13 are connected to the current collector 111 to form a composite structure. The flexibility of the matching of the lug and the current collector 111 is improved, the assembly and wiring work is facilitated, the cutting of the lug is facilitated, and the manufacturing efficiency is improved. In addition, the current collector 111, the first tab 12 and the second tab 13 are less limited in material, and they may be made of the same or different materials to meet different purposes.

With reference to fig. 4, further, the first end 101 and the second end 102 of the current collector 111 are respectively provided with a blank area without the active material 112, the first tab 12 is connected to the blank area of the first end 101 of the current collector 111, and the second tab 13 is connected to the blank area of the second end 102 of the current collector 111, so that the first tab 12 and the second tab 13 can be conveniently connected to the current collector 111 by providing the blank areas, so as to facilitate the combination of the first tab 12 and the second tab 13.

Specifically, the tab and the margin area of the current collector 111 may be welded, the first tab 12 is welded to the first end 101 of the current collector 111, and the second tab 13 is welded to the second end 102 of the current collector 111, so as to facilitate manufacturing, improve connection stability, and reduce cost.

According to the cell pole piece 10 of the embodiment of the present invention, in the blank current collector 111 region not coated with the active material 112, the tab and the current collector 111 may be combined by ultrasonic welding (seam welding), wherein the first tab 12 and the second tab 13 may be made of a foil material, and the material may be selected to be the same as the current collector 111 or may be a material that can be welded to each other by ultrasonic welding. Optionally, the ultrasonic welding part can be protected by adhesive tape or ceramic coating, or can not be protected, and can be reasonably adjusted according to actual conditions.

Optionally, the thickness of the first tab 12 and the second tab 13 is not less than the thickness of the current collector 111, i.e. the thickness of the first tab 12 and the second tab 13 may be greater than or equal to the thickness of the current collector 111, so as to increase the cross-sectional area of the tabs and further reduce the resistance. In other words, the overcurrent sectional area of the tab is increased, so that the overcurrent capacity of the first tab 12 and the second tab 13 is improved, and the overcurrent bottleneck of the first tab 12 and the second tab 13 is solved, so that the heating problem during charging and discharging is relieved.

It should be noted that whether the cell pole piece 10 is rolled or not does not affect the effect of the scheme.

Optionally, the thickness of the first and second tabs 12, 13 is no greater than the thickness of the pole piece body 11. Therefore, the internal resistance can be reduced, and the space can be saved, which is beneficial to reducing the size of the battery cell pole piece 10, thereby reducing the size of the battery cell pole group 100.

Alternatively, both sides of the connection portion of the first tab 12 are not shorter than both sides of the first end 101 of the current collector 111, and both sides of the connection portion of the second tab 13 are not shorter than both sides of the second end 102 of the current collector 111. The internal resistance of the battery core pole piece 10 can be reduced, the conductive effect of the battery core pole piece is improved, so that the heat and energy loss generated in the battery core charging and discharging process are reduced, the energy utilization rate is improved, the energy is saved, the environment is protected, and the heat management of the battery core is optimized.

Optionally, the electrode portion of the first tab 12 and the electrode portion of the second tab 13 are staggered and do not overlap in the projection along the extending direction of the current collector 111, so as to facilitate connection of a bus bar and electrical connection. Specifically, when two battery pole pieces 10 constitute battery pole group 100, the battery core part of the tab arranged in a staggered manner is favorable for arrangement, so that the reasonability and the balance of arrangement of battery pole group 100 are improved, and the space saving is facilitated.

Alternatively, the size of the connection portion in the first tab 12 and the second tab 13 in the extending direction of the current collector 111 is not smaller than the thickness of the current collector 111 to have the effect of reducing the resistance. For example, when the cell pole pieces 10 form the cell pole group 100, the cell pole pieces 10 may be cut, see fig. 2, in order to avoid the occurrence of an overcurrent bottleneck, the product of the sectional area of the tab connection portion and the thickness of the tab is configured to be a form smaller than the sectional area of the tab connection portion, so that the conductive capability of the tab is matched with the current collector 111, and the problem of an overlarge resistance at the cut portion is avoided. In other words, the "a site" and the "c site" form a "wire" whose conductivity (cross-sectional area of the wire) matches the current collector 111, i.e., a ≧ c (current collector thickness), where the dimensions a and c can be referred to in FIG. 2.

As shown in fig. 3 to fig. 6, a schematic diagram of a manufacturing process of a cell electrode sheet 10 according to an embodiment of the present invention is described, where fig. 3 shows a schematic diagram of a current collector 111 before cutting, and an active material 112 is coated on the current collector 111 to obtain the structure shown in fig. 4, where both ends of the current collector 111 are not coated with an active material and are configured as a blank area, and fig. 5 may weld a first tab 12 and a second tab 13 to the blank area of the current collector 111 by ultrasonic welding or the like to obtain the structure shown in fig. 6, and then cut the structure in fig. 6, so as to obtain the cell electrode sheet 10 shown in fig. 1.

With reference to fig. 7 to 9, a cell electrode group 100 according to an embodiment of the present invention includes a positive plate 10P and a negative plate 10N, where the positive plate 10P and the negative plate 10N both include the aforementioned cell electrode sheet 10, the positive plate 10P and the negative plate 10N are stacked, a first tab 12 on the positive plate 10P and a first tab 12 on the negative plate 10N are located at the same end of the cell electrode group 100, and the electrode portions are staggered, and a second tab 13 on the positive plate 10P and a second tab 13 on the negative plate 10N are located at the same end of the cell electrode group 100, and the electrode portions are staggered.

Specifically, with reference to fig. 7 to 9, the positive electrode tab 10P includes a positive electrode tab body 11P, a first positive electrode tab 12P and a second positive electrode tab 13P, the first positive electrode tab 12P and the second positive electrode tab 13P are respectively connected to two ends of the positive electrode tab body 11P, the negative electrode tab 10N includes a negative electrode tab body 11N, a first negative electrode tab 12N and a second negative electrode tab 13N, and the first negative electrode tab 12N and the second negative electrode tab 13N are respectively connected to two ends of the negative electrode tab body 11N. The positive plate body 11P and the negative plate body 11N are arranged in a stacked manner, the first positive tab 12P and the first negative tab 12N are arranged at the same end of the cell pole group 100 and staggered, and the second positive tab 13P and the second negative tab 13N are arranged at the same end of the cell pole group 100 and staggered.

After the positive electrode plate 10P and the negative electrode plate 10N are stacked, the performance and stability of the cell electrode group 100 can be improved. In actual work, the distance that electric current passes through in the pole piece can be shortened to reduce the internal resistance, thereby improve battery charging performance, improve life, can also solve the negative pole tip that long electric core both ends impedance inequality leads to and educe lithium scheduling problem.

According to the battery cell of the embodiment of the present invention, the battery cell includes a plurality of battery cell pole pieces 10, where the battery cell pole pieces 10 are the battery cell pole pieces 10, and the battery cell pole pieces 10 are stacked. By applying the battery cell pole piece 10, the internal resistance can be reduced, so that the problems of short long-battery-cell high-rate charge-discharge service life and battery high-rate charge heating are solved, and the problems of lithium precipitation at the end part of the negative electrode and the like caused by uneven impedance at two ends of the long battery cell are also solved.

The cell pole piece 10 and the cell pole group 100 according to an embodiment of the present invention are described below with reference to the drawings.

With reference to fig. 1 to 9, according to the cell pole piece 10 and the cell pole group 100 of the embodiment of the present invention, the cell pole piece 10 includes: the electrode plate comprises a pole piece body 11, a first electrode tab 12 and a second electrode tab 13, wherein specifically, the pole piece body 11 comprises a current collector 111, the surface of the current collector 111 is provided with an active substance 112, the current collector 111 further comprises a first end 101 and a second end 102 which are not provided with a blank area of the active substance 112, and the first electrode tab 12 comprises a connecting part and an electrode part. The second tab 13 includes a connection portion and an electrode portion. The cell pole group 100 includes: a positive plate 10P and a negative plate 10N, wherein the positive plate 10P and the negative plate 10N comprise the aforementioned cell pole piece 10.

Specifically, when the active materials 112 of the positive and negative electrode sheets are coated on the corresponding current collectors 111, a blank current collector (i.e., not coated with active materials) with a certain width needs to be remained on the current collectors, and the blank area configures the first end 101 and the second end 102 of the current collector 111 for connecting the first electrode tab 12 and the second electrode tab 13.

Further, a strip of metal foil is compounded on the first end 101 and the second end 102 of the current collector 111 in an ultrasonic welding (seam welding) manner to form a first tab 12 and a second tab 13, wherein the first tab 12 and the second tab 13 are made of the same material as the current collector 111 of the pole piece or made of a material capable of being welded to each other by ultrasonic welding. The material thickness of the first tab 12 and the second tab 13 foil is larger than that of the current collector 111, and the overcurrent capacity is met. And cutting the pole piece subjected to ultrasonic pole lug compounding. The tab cutting can be performed in a laminated mode or in a winding mode.

It should be noted that the thickness of the composite foil is greater than the thickness of the current collector 111, but does not exceed the thickness of the pole piece, and the width is the length of the tab design (see distance b in the figure). In order to ensure the overcurrent capacity of the first tab 12 and the second tab 13 and avoid the generation of overcurrent bottleneck, the sectional area of the "a position" in fig. 2 is similar to the sectional area of the current collector 111 corresponding to the length of the "c position" in fig. 2. I.e., the "a-site" dimension, depends on the thickness of the tab and the "c-site" dimension length as well as the current collector 111 thickness.

In addition, the positions of the first tab 12 and the second tab 13 at the two ends of the cell pole piece 10 can be changed with each other.

Furthermore, the positive and negative pole pieces and the diaphragm are laminated according to a conventional battery, two ends of the laminated battery cell pole group are respectively provided with two tabs (a positive tab and a negative tab), and each battery cell pole group has four tabs (namely a first positive tab, a first negative tab, a second positive tab and a second negative tab).

Utmost point ear is connected with the apron terminal and is assembled, because electric core utmost point group is 4 utmost point ears, then there are 4 output utmost point posts in the aluminum hull outward appearance, both ends of battery have positive negative pole utmost point post simultaneously. Of course, if the assembly is in the form of a soft pack, there are also 4 terminals on the appearance of the soft pack.

Therefore, the lug is respectively arranged at the two ends of the pole piece, and the lug overcurrent sectional area is increased in a mode of compounding the lug, so that the overcurrent bottleneck of the lug is solved. The internal resistance of the pole piece is halved through the design of the composite pole lug and the two pole lugs, and the internal resistance of the battery is greatly reduced.

According to the cell pole piece 10 disclosed by the utility model, the first pole lug 12 and the second pole lug 13 are respectively arranged at two ends of the pole piece, and the pole lug overcurrent bottleneck is solved in a pole lug compounding mode, so that the effect of halving the internal resistance of the battery is really realized, the problems of short service life of long-cell high-rate charge and discharge and high-rate charge and heat generation of the battery are solved, and the problems of lithium precipitation at the negative electrode end part and the like caused by uneven impedance at two ends of the long cell are also solved.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A cell pole piece, comprising:

the pole piece body comprises a current collector and an active substance arranged on the surface of the current collector;

a first tab connected to a first end of the current collector;

a second tab connected to a second end of the current collector,

the first electrode lug and the second electrode lug respectively comprise a connecting part and an electrode part connected with the connecting part, and the connecting part is connected with the current collector.

2. The cell pole piece of claim 1, wherein the first tab, the second tab, and the current collector are of a split structure.

3. The cell pole piece of claim 2, wherein the first end and the second end of the current collector are respectively provided with a blank area without active materials, the first tab is connected with the blank area of the first end of the current collector, and the second tab is connected with the blank area of the second end of the current collector.

4. The cell pole piece of claim 2 or 3, wherein the first tab is welded to the first end of the current collector, and the second tab is welded to the second end of the current collector.

5. The cell pole piece of any one of claims 1 to 3,

the thicknesses of the first lug and the second lug are not less than the thickness of the current collector; and/or

The thickness of the first pole lug and the second pole lug is not larger than that of the pole piece body.

6. The cell pole piece of claim 1, wherein both sides of the connection portion of the first tab are not shorter than both sides of the first end of the current collector, and both sides of the connection portion of the second tab are not shorter than both sides of the second end of the current collector.

7. The cell pole piece of claim 6, wherein the electrode portions of the first and second tabs are staggered and do not overlap in a projection along the direction of extension of the current collector.

8. The cell pole piece of claim 1, wherein a dimension of the connecting portion of the first tab and the second tab in the extending direction of the current collector is not less than the thickness of the current collector.

9. An electric core polar group, characterized in that, includes positive plate and negative pole piece, positive plate with the negative pole piece all includes the electric core polar piece of any one of claims 1-8, positive plate with the range upon range of arrangement of negative pole piece, first utmost point ear on the positive plate with first utmost point ear on the negative pole piece is located same one end and the electrode part of electric core polar group staggers, second utmost point ear on the positive plate with second utmost point ear on the negative pole piece is located same one end and the electrode part of electric core polar group staggers.

10. An electric core, characterized in that the electric core comprises a plurality of electric core pole pieces, the electric core pole pieces are the electric core pole pieces according to any one of claims 1 to 8, and the plurality of electric core pole pieces are stacked.

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