CN220914512U - Pole piece, battery core, energy storage device and electric equipment - Google Patents

Abstract

The utility model discloses a pole piece, an electric core, an energy storage device and electric equipment, wherein the pole piece comprises: a main body portion including a first section and a second section, the first section being provided as a winding start section; the pole ear comprises a gradient pole ear, the gradient pole ear is arranged on the first section and comprises a first edge and a second edge, the first edge is the edge of the gradient pole ear away from one side of the main body, the second edge is the edge of one side of the gradient pole ear connected with the main body, the first edge and the second edge are preset included angles, so that after the pole piece is wound along the winding center, the gradient pole ear is bent towards the winding center shaft, the two ends of the first edge are positioned on the circumference with the same radius as the winding center shaft, and after the pole piece is wound, the area, close to the winding center shaft, of the pole piece after being bent and overlapped is smoother, and subsequent welding is facilitated.

Description

Pole piece, battery core, energy storage device and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a pole piece, an electric core, an energy storage device and electric equipment.

Background

Along with pursuing higher battery energy density, the large cylindrical battery cell is more and more popular, in order to improve the energy density of the large cylindrical battery and reduce impedance, a mode of full-tab pole pieces appears, and compared with the traditional pole pieces for welding the tabs, the internal resistance of the full-tab pole piece battery cell is low, the even temperature rise of battery cell heat generation is low during overcurrent, and the energy density of the battery is also increased. However, dust is easy to generate in the process of winding and flattening all-lug pole pieces, the problem of dust in the flattened lug is solved by using the cut and overlapped lug in the related technology, but the winding radius of the inner ring of the winding core is small, overlapping and staggering between the lugs cause uneven area near a wound central hole, thus being not beneficial to subsequent welding and further being not beneficial to the reduction of the impedance of a large cylindrical battery cell.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a pole piece, which has the advantages of improving the welding flatness of the central hole area of the pole piece and the current collecting disc, improving the welding yield and further reducing the impedance.

The second object of the present utility model is to provide an electrical core, which includes the above-mentioned pole piece.

A third objective of the present utility model is to provide an energy storage device, which includes the above-mentioned battery cell.

A fourth object of the present utility model is to provide an electric device, including the energy storage device.

According to an embodiment of the first aspect of the present utility model, a power conversion device, a pole piece includes: a body portion including a first section provided as a winding start section; the pole lug comprises a gradient pole lug, the gradient pole lug is arranged on the first section and comprises a first edge and a second edge, the first edge is the edge of the gradient pole lug away from one side of the main body part, the second edge is the edge of one side, connected with the main body part, of the gradient pole lug, the first edge and the second edge are preset included angles, so that after the pole piece is wound along the winding center, the gradient pole lug is bent towards the winding center shaft, and two ends of the first edge are located on circumferences with the same radius on the winding center shaft.

According to the pole piece provided by the embodiment of the utility model, the first section is the winding initial section, the gradient pole lugs with the first edge and the second edge being in the preset included angle are arranged on the first section, the gradient pole lugs are inner ring pole lugs close to the winding central shaft of the battery core after the pole piece is wound, the first edge of the gradient pole lugs are bent towards the winding central shaft, namely the direction of the central hole of the battery core, the two ends of the first edge can be simultaneously fallen on the circumference with the same radius of the circle center on the winding central shaft by arranging the preset included angle, so that the pole lugs around the winding central shaft of the battery core are compacter and smoother around the central hole, the welding yield of the follow-up pole lugs and the current collecting disc is increased by improving the flatness, the impedance of the battery core can be reduced, and meanwhile, compared with the design of the pole lugs near the central hole of the winding initial section, the impedance can be further reduced due to compacter distribution of the pole lugs.

In some embodiments, the body portion further comprises a second section configured to wind up the tail section; the length of the first section is L, the height of the gradient tab nearest to the second section is K in the pole piece unfolding state, and the included angle theta between the first side and the second side is arctan (K/L).

In some embodiments, the pole piece further comprises: the second section is provided with equal-height lugs, and the heights of the equal-height lugs are K.

In some embodiments, further, the pole piece comprises a plurality of gradient tabs, and the plurality of gradient tabs continuously increase in height in a direction of the first section toward the second section.

In some embodiments, further, the height of the gradient tab continuously increases from 0 to K.

In some embodiments, further, the gradient tab is adapted to be stacked with the separator, and after being wound around the winding central axis, the first section is wound around the winding central axis for one or more turns, and after being bent towards the winding central axis, two ends of the first edge of the gradient tab are located on a circumference with a same radius and a center on the winding central axis.

In some embodiments, the pole piece includes a plurality of gradient tabs, and the plurality of gradient tabs increases in width in a direction of the first segment toward the second segment.

In some embodiments, further, the gradient tabs have a minimum width d0 and a maximum width d, n gradient tabs are provided, and a width difference between adjacent gradient tabs is (d-d 0)/n.

In some embodiments, further, the d0 ranges between 2mm and 5mm.

In some embodiments, further, the d0=3 mm.

In some embodiments, further, the second section is provided with a tab with a width d.

According to an embodiment of the second aspect of the present utility model, a battery cell includes: the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound to form a winding core; wherein at least one of the first pole piece and the second pole piece is the pole piece of any one embodiment of the utility model.

An energy storage device according to an embodiment of the third aspect of the present utility model comprises a cell according to an embodiment of the first aspect of the present utility model.

An electrical device according to an embodiment of the fourth aspect of the present utility model comprises an energy storage device according to an embodiment of the first aspect of the present utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the present utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of a powered device according to an embodiment of the utility model.

Fig. 2 is a winding schematic diagram of a battery cell in the related art.

Fig. 3 is a schematic illustration of a pole piece according to an embodiment of the present utility model.

Fig. 4 is a winding schematic of a cell according to an embodiment of the utility model.

Fig. 5 is a schematic cross-sectional view of a cell according to an embodiment of the utility model.

Reference numerals:

1-pole pieces; 10-an electric core; 100-an energy storage device; 1000-electric equipment;

2-a main body; 22-first section; 24-a second section;

3-electrode lugs; 32-gradient tab; 34-a tab of equal height; 322-first side; 324-second side;

4-a membrane; 5-winding the central shaft.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present application is not to be construed as being limited.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Embodiments of the present application refer to energy storage devices that are single physical modules that include one or more battery cells to provide higher voltages and capacities. For example, the energy storage device referred to in the present application may include a battery module or a battery pack, or the like. The energy storage device generally includes a housing for enclosing one or more battery cells. The box body can avoid liquid or other foreign matters from affecting the charging or discharging of the battery cell monomers.

The electric equipment of the electric device can be vehicles, computers, notebook computers, electric toys and the like. The electric equipment comprises an energy storage device, and the energy storage device is used for supplying power to the electric equipment.

The electric equipment in the embodiment of the utility model is exemplified by a vehicle. Specifically, the powered device further includes a vehicle body, and the energy storage device 100 is mounted to the vehicle body. In this embodiment, the vehicle body includes a chassis. The energy storage device is arranged on the chassis.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric device 1000 according to an embodiment of the utility model. The power utilization device 1000 includes an energy storage device 100. The energy storage device 200 provides a source of power for the power utilization device 100.

Consumer 1000 includes, but is not limited to, a Pure electric vehicle (Pure ELECTRIC VEHICLE/Battery ELECTRIC VEHICLE, PEV/BEV), a Hybrid vehicle (Hybrid ELECTRIC VEHICLE, HEV), an Extended Range electric vehicle (Range Extended ELECTRIC VEHICLE, REEV), a Plug-in Hybrid ELECTRIC VEHICLE, PHEV, or a new energy vehicle (NEW ENERGY VEHICLE).

The battery cell mainly relies on metal ions to move between a positive plate and a negative plate, the positive plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive tabs is plural and stacked together, and the number of negative tabs is plural and stacked together. The separator may be made of PP (polypropylene) or PE (polyethylene).

The pole piece can be a positive pole piece or a negative pole piece, the pole piece comprises a main body part, the main body part is a part of the current collector coated with an active material layer and the active material layer on the part, and the pole lug is the current collector without the active material layer.

Specifically, as shown in fig. 3, the pole piece 1 includes: the main part 2 and set up the utmost point ear 3 in main part 2 one side, main part 2 includes first section 22 and second section 24, and first section 22 sets up to the winding beginning section, and second section 24 sets up to the winding receipts tail section. The first section 22 of the tab 3 is provided with a gradient tab 32, the gradient tab 32 comprises a first edge 322 and a second edge 324, the first edge 322 is an edge of the gradient tab 32 far away from one side of the main body 2, the second edge 324 is an edge of the gradient tab 32 connected with one side of the main body 2, and the first edge 322 and the second edge 324 form a preset included angle, so that after the gradient tab 32 is bent towards the winding central shaft 5 after winding, two ends of the first edge 322 are located on circumferences with the same radius of the circle center on the winding central shaft 5. It will be appreciated that since the pole piece will be stacked with the diaphragm when wound, both the pole piece and the diaphragm have thicknesses, the top view of the pole piece after winding is spiral, and the dimensions and process errors, both ends of the first side 322 in this embodiment are located on a circumference with a radius of the center on the winding center axis 5 being approximately the same within the process allowable range.

According to the pole piece 1 of the embodiment of the utility model, when the pole piece 1 is stacked with the diaphragm 4 and the battery cell 10 is formed by winding from the winding start section, the first section 22 is used as the winding start section, so that the first section is a part close to the inner ring of the battery cell 10, and the gradient tab 32 on the first section 22 is the inner ring tab 3. Because the winding radius of the inner ring is smaller, the winding curvature is larger, and the thicknesses of the pole piece 1 and the diaphragm 4 are added, after the pole lug 3 is bent towards the winding central axis 5, one end of the first edge 322, which is far away from the winding central axis 5, is far away from one end, which is close to the winding central axis 5, of the winding central axis, when the first edge 322 is bent to cover the wound battery cell 10, if the first edge 322 is parallel to the second edge 324, as shown in fig. 1, due to the difference of winding strokes at two ends of the first edge 322, the two ends of the first edge 322 cannot be located on the circumference with the same radius of the circle center on the winding central axis 5, so that the winding central axis 5, that is, the pole lug 3 near the winding central axis 5 of the battery cell 10, is staggered, has low flatness, and is unfavorable for subsequent welding, and the impedance of the battery cell 10 is raised.

According to the pole piece 1 of the embodiment of the utility model, the first section 22 is set as the winding initial section, the first side 322 and the second side 324 are set on the first section 22 to form the gradient pole lug 32 with a preset included angle, and as the gradient pole lug 32 is the inner ring pole lug 3 close to the winding central axis 5 of the battery cell 10 after the pole piece 1 is wound, the first side 322 of the gradient pole lug 32 is bent towards the winding central axis 5, namely the winding central axis 5 of the battery cell 10, and the two ends of the first side 322 can be simultaneously placed on the circumference with the same radius of the circle center on the winding central axis 5 by setting the preset included angle, so that the pole lugs 3 around the winding central axis 5 of the battery cell 10 are distributed more compactly and flatly around the winding central axis 5, the improvement of the flatness increases the welding yield of the follow-up pole lugs 3 and the current collecting disc, and the impedance of the battery cell 10 can be reduced. In the related art, a through hole penetrating through the cell 10 is generally provided in a region centered on the winding center axis 5 as an electrolyte injection port of the cell 10, and the inner ring tab 3 near the winding center axis 5 of the cell 10 is easily staggered and disordered to block the injection port, thereby affecting the injection. In order to solve the problem that the inner ring tab 3 shields the liquid injection port, the winding start section is generally set to be an electrodeless tab 3 section in the related art, so that no tab 3 is stacked near the winding center shaft 5 to avoid shielding the liquid injection port. However, as the tabs 3 are reduced, the inner ring of the cylindrical battery cell 10 does not have the tabs 3, so that the impedance of the battery cell 10 is increased, and the overcurrent capacity is reduced. Compared with the design of the electrodeless lug 3 at the winding initial section, the design of the electrodeless lug 3 near the winding central shaft 5 has the advantages that the distribution of the electrodeless lugs 3 is compact, and the impedance is further reduced.

Referring to fig. 3, in the pole piece 1 according to some embodiments of the present utility model, the length of the first segment 22 is L, the height of the gradient tab 32 nearest to the second segment 24 in the unfolded state of the pole piece 1 is K, and the angle θ between the first edge 322 and the second edge 324 is arctan (K/L). For example, the gradient tab 32 is trapezoidal, the first side 322 and the second side 324 are trapezoidal waists, in some embodiments, referring to fig. 4, the gradient tab 32 may be a right trapezoid, the first side 322 is a bevel edge, the second side 324 is perpendicular to the upper bottom and the lower bottom of the trapezoid, by setting the included angle θ between the first side 322 and the second side 324 to be arctan (K/L), compared with the conventional tab 3 parallel to the first side 322 and the second side 324, the first side 322 of the tab 3 provided in the embodiment of the utility model is longer than the second side 324, and the included angle θ=arctan (K/L) between the first side 322 and the second side 324 enables the length of the first side 322 greater than the length of the second side 324 to compensate for the formation of the first side 322 greater than the second side 324 when the first side 322 is wound, so that the two ends of the first side 322 are located on the circumference with the same radius of the center on the winding center axis 5. It will be appreciated that in other embodiments of the present utility model, the tab 3 may have a shape other than a right trapezoid, and two sides of the tab 3 other than the first side 322 and the second side 324 may be oblique lines not perpendicular to the first side 322 and the second side 324, or curved sections, irregular sections, etc.

Meanwhile, in some embodiments, the height of the tab 3 closest to the first segment 22 on the second segment 24 of the pole piece 1 is K, which is the same as the height of the gradient tab 32 closest to the second segment 24, and the height of the gradient tab 32 of the first segment 22 is gradually increased to K along the direction of the included angle θ=arctan (K/L) with the second edge 324, so that the gradient tab 32 is gradually increased from the winding start point to the second segment 24, and the tab 3 is prevented from blocking the winding central axis 5. In some embodiments, the tabs 3 on the second section 24 are all equal-height tabs 34, each having a height K. The height of the gradient tab 32 on the first section 22 is smaller than that of the equal-height tab 34 on the second section 24, and the gradient tab 32 gradually increases to be the same as the equal-height tab 34, so that the overcurrent capacity of the central area of the cylindrical cell 10 is ensured, and the blocking of the liquid injection port by the tab 3 is avoided.

According to some embodiments of the present utility model, the first section 22 of the pole piece 1 is provided with a plurality of gradient tabs 32 with an included angle θ between the first edge 322 and the second edge 324 being arctan (K/L), and the heights of the plurality of gradient tabs 32 continuously increase in the direction from the first section 22 toward the second section 24. Specifically, the height of the first segment 22 gradient tab 32 gradually increases from 0 to K. It is understood that the height of the gradient tab 32 may be increased gradually to K along an angle arctan (K/L) with the second side 324, or may be increased gradually in other angular directions as will be appreciated by those skilled in the art.

Referring to fig. 5, when the pole piece 1 and the separator 4 provided in this embodiment are stacked and disposed, after being wound around the winding central axis 5, the first section 22 is wound around the winding central axis 5 for one or more turns, the plurality of gradient tabs 32 disposed on the first section 22 are inner ring tabs 3 of the cylindrical battery core 10, and when the plurality of gradient tabs 32 are folded towards the winding central axis 5, an included angle θ between the first edge 322 and the second edge 324 of the gradient tab 32 is arctan (K/L), and a longer portion of the first edge 322 than the second edge 324 can substantially compensate for the longer winding formation of the first edge 322 than the second edge 324, so that two ends of the first edge 322 can fall on a circumference with the same radius on the winding central axis 5. Meanwhile, as the pole piece 1 and the diaphragm 4 have thicknesses along with winding, the farther the pole lug 3 is from the winding start point, the farther the first edge 322 is from the winding center axis 5 after being bent towards the winding center, compared with the pole lug 3 with the same height adopted in the related art, the included angles between the first edge 322 and the second edge 324 of the plurality of gradient pole lugs 32 on the first section 22 of the pole lug 3 provided by the embodiment are θ, and the heights gradually increase to K, so after the gradient pole lugs 32 are bent towards the winding center axis 5, the lengths of the first edge 322 of the gradient pole lugs 32 at different positions from the winding center axis 5 can be compensated by the gradually increased pole lug 3 heights, so that the two ends of the first edge 322 of the same circle of at least two gradient pole lugs 32 are approximately positioned on the circumference with the same radius and the center on the winding center axis 5. It will be understood that, since the pole piece 1 and the diaphragm 4 are stacked, the pole piece 1 and the diaphragm 4 have thicknesses, and therefore, the top view of the pole piece 1 after winding is spiral, so the same circle of gradient tabs 32 in this embodiment is not a complete circumference, and the same circle in this embodiment is a track between positions of the moving point closest to the winding start point after rotating around the winding central axis 5 along a spiral line for one circle, or a track between positions of the moving point closest to the starting point of the previous circle after rotating around the spiral line for one circle. And because of the thickness of the pole piece 1 and the diaphragm 4, the two ends of the first edge 322 of the same circle of at least two gradient pole lugs 32 are approximately positioned on the circumference of the winding central shaft 5 in the same radius within the allowable range of process errors.

In this embodiment, two ends of the first edge 322 of two or more gradient tabs 32 can be located on the circumference of the same radius and the center of the circle on the winding central shaft 5, so that the edge uniformity of the gradient tabs 32 is greatly improved, and the same ring of tabs 3 after folding has almost the same edge, so that the flatness of the stacking surface of the tabs 3 close to the winding central shaft 5 is improved, the subsequent welding is facilitated, and the impedance of the battery cell 10 is further reduced.

According to other embodiments of the present utility model, the first section 22 of the pole piece 1 is provided with a plurality of gradient tabs 32, n in number, and the widths of the n gradient tabs 32 increase gradually along the direction from the first section 22 toward the second section 24. Specifically, the minimum width of the gradient tab 32 is d0, and the tab 3 located at the winding start end of the first segment 22 and closest to the winding center axis 5 is the minimum width of the tab 3. In some embodiments, the maximum width of the gradient tabs 32 is d, and the width difference between adjacent gradient tabs 32 is (d-d 0)/n. I.e., the gradient tab 32 increases in width (d-d 0)/n from d0 toward the second segment 24, until d. In particular, d0 ranges from 2mm to 5mm, preferably d0 may be 3mm. Further, the second section 24 is provided with a tab 34 with a width d of the tab 34. Compared with the tab 3 with the same width, the width of the tab 3 provided in this embodiment gradually increases from inside to outside along the winding direction to be the same as the width of the tab 3 of the second section 24, so that the problem that the inner ring tab 3 is easier to tear due to the higher curvature of the inner ring tab 3 relative to the outer ring tab 3 during winding in the winding process is avoided. According to the utility model, the width of the tab 3 is gradually increased from d0 to d according to the number, wherein the range of d0 is 2mm-5mm, so that the tab 3 is prevented from being torn due to overlarge winding curvature of the inner ring during winding while the overcurrent capacity is ensured, and the yield of the battery cell 10 is further improved.

The utility model also provides an electric core 10, which comprises a first pole piece 1, a diaphragm 4 and a second pole piece 1, wherein the diaphragm 4 is positioned between the first pole piece 1 and the second pole piece 1, the first pole piece 1, the diaphragm 4 and the second pole piece 1 are wound to form a winding core, and at least one of the first pole piece 1 and the second pole piece 1 is provided by any one of the pole pieces 1 provided by the embodiment. According to the battery cell 10 provided by the utility model, the overcurrent capacity of the battery cell 10 is improved, the impedance is reduced, and the yield of the battery cell 10 is also improved.

The present utility model also provides an energy storage device 100, including the battery cell 10 provided according to the above embodiment. According to the energy storage device provided by the embodiment of the utility model, the battery core 10 has lower impedance, so that the service performance of the energy storage device is improved. The energy storage device may include a plurality of secondary cells 10. For example, nickel-hydrogen cells 10, nickel-cadmium cells 10, lead-acid (or lead-reservoir) cells 10, lithium ion cells 10, polymer lithium ion cells 10, and the like. In other embodiments, the energy storage device may further include a plurality of lithium ion primary cells 10, lithium sulfur cells 10, sodium lithium ion cells 10 or sodium ion cells 10 or magnesium ion cells 10, and so on.

The utility model also provides the electric equipment 1000, which comprises the energy storage device provided by the embodiment. The powered device provided according to the present embodiment may be a vehicle including, but not limited to, a Pure electric vehicle (Pure ELECTRIC VEHICLE/Battery ELECTRIC VEHICLE, PEV/BEV), a Hybrid vehicle (Hybrid ELECTRIC VEHICLE, HEV), a Range Extended electric vehicle (Range Extended ELECTRIC VEHICLE, REEV), a Plug-in Hybrid ELECTRIC VEHICLE, PHEV, or a new energy vehicle (NEW ENERGY VEHICLE). The electric equipment can be other electronic equipment or mechanical equipment and the like, and the utility model does not specifically limit the functions and the use scenes of the electric equipment. According to the electric equipment provided by the utility model, the use performance of the electric equipment 1000 is effectively improved by adopting the pole piece 1, the battery cell 10 or the energy storage equipment 100.

Other configurations and operations of the pole piece 1, the battery cell 10, the energy storage device 100, and the power utilization apparatus 1000 according to the embodiments of the present utility model are known to those of ordinary skill in the art, and will not be described in detail herein.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (14)

1. A pole piece, the pole piece comprising:

A body portion including a first section provided as a winding start section;

The pole lug comprises a gradient pole lug, the gradient pole lug is arranged on the first section and comprises a first edge and a second edge, the first edge is far away from the edge of one side of the main body part, the second edge is the edge of one side, connected with the main body part, of the gradient pole lug, and the first edge and the second edge are preset included angles, so that after the pole piece is wound along the winding center, the gradient pole lug is bent towards the winding center shaft, and two ends of the first edge are located on the circumference with the same radius of the center on the winding center shaft.

2. A pole piece according to claim 1, characterized in that:

the main body part further comprises a second section, and the second section is arranged as a winding tail-collecting section;

the length of the first section is L, the height of the gradient tab nearest to the second section is K in the pole piece unfolding state, and the included angle theta between the first side and the second side is arctan (K/L).

3. A pole piece according to claim 2, characterized in that:

The second section is provided with equal-height lugs, and the heights of the equal-height lugs are K.

4. A pole piece according to claim 2, characterized in that:

The pole piece comprises a plurality of gradient pole lugs, and the heights of the gradient pole lugs continuously increase in the direction of the first section towards the second section.

5. A pole piece according to claim 4, characterized in that:

the height of the gradient tab continuously increases from 0 to K.

6. A pole piece according to claim 4, characterized in that:

The gradient tab is suitable for stacking the pole pieces and the diaphragms, and is wound around a winding central shaft, the first section is wound around the winding central shaft for one or more circles, and after the gradient tab is bent towards the winding central shaft, two ends of the first edge of the same circle of at least two gradient tabs are positioned on the circumference of the same radius and the circle center on the winding central shaft.

7. A pole piece according to claim 1, characterized in that:

The pole piece comprises a plurality of gradient pole lugs, and the widths of the gradient pole lugs are gradually increased in the direction of the first section towards the second section.

8. A pole piece according to claim 7, characterized in that:

The minimum width of each gradient tab is d0, the maximum width of each gradient tab is d, n gradient tabs are arranged, and the width difference between adjacent gradient tabs is (d-d 0)/n.

9. A pole piece according to claim 8, characterized in that:

The d0 range is between 2mm and 5 mm.

10. A pole piece according to claim 9, characterized in that:

The d0=3 mm.

11. A pole piece according to claim 8, characterized in that:

The second section is provided with equal-height lugs, and the widths of the equal-height lugs are d.

12. A cell, comprising:

The diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound to form a winding core;

Wherein at least one of the first pole piece and the second pole piece is the pole piece of any one of claims 1 to 11.

13. An energy storage device is characterized in that,

Comprising the cell of claim 12.

14. An electric device is characterized in that,

Comprising the energy storage device of claim 13.