CN219203444U - Pole piece, electrode assembly, battery monomer, battery module and electric equipment - Google Patents

Abstract

The utility model discloses a pole piece, an electrode assembly, a battery monomer, a battery module and electric equipment. The pole piece comprises a main piece area and a plurality of pole lugs connected to the long edge of the main piece area, wherein the pole lugs are sequentially arranged at intervals along the length direction of the main piece area, the distance between two adjacent pole lugs is equal to the distance, and the following conditions are met by the distance: when the pole piece is wound into a winding core, the main piece area is wound into a plurality of layers, at least two adjacent layers are provided with pole lugs and intervals, and the intervals on the at least two adjacent layers are arranged in a one-to-one opposite mode along the radial direction of the winding core so as to form at least one channel extending along the radial direction. After the pole piece is wound into a winding core, the distance between two adjacent layers is arranged in a one-to-one opposite way along the radial direction of the winding core, so that the flow paths of water vapor and electrolyte are shortened, and the speed of removing the water vapor and the liquid injection rate in the follow-up process are improved.

Description

Pole piece, electrode assembly, battery monomer, battery module and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a pole piece, an electrode assembly, a battery cell, a battery module and electric equipment.

Background

In the prior art, the lug structure of the battery is formed by full lug kneading square. After the polar lugs are kneaded flat, the channels in the axial direction between the diaphragm and the polar plates are easily blocked, and the follow-up water vapor removal speed and the liquid injection speed are influenced. In the related art, a plurality of openings are formed in one side of the pole piece, and the openings can form channels when the pole piece is wound into a winding core, so that the water and air removal speed and the liquid injection speed are improved.

However, after the tab is wound into a winding core, the openings on two adjacent layers may be dislocated, which prolongs the flow path of the water vapor and the electrolyte, and affects the speed of removing the water vapor and the liquid injection rate.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the pole piece, after the pole piece is wound into the winding core, the distance between two adjacent layers is arranged in a one-to-one opposite way along the radial direction of the winding core, so that the flow paths of water vapor and electrolyte are shortened, and the speed of removing the water vapor and the liquid injection rate in the follow-up process is improved.

The utility model also aims to provide an electrode assembly with the pole piece.

The utility model also aims to provide a battery cell with the electrode assembly.

The utility model also aims to provide a battery module with the battery cell.

The utility model also aims to provide electric equipment with the battery module.

According to the pole piece, the pole piece comprises a main piece area and a plurality of pole lugs connected to the long side of the main piece area, the pole lugs are sequentially arranged at intervals along the length direction of the main piece area, a distance is reserved between two adjacent pole lugs, and the distance satisfies the following conditions: when the pole piece is wound into a winding core, the main piece area is wound into a plurality of layers, at least two adjacent layers are provided with the pole lugs and the spacing, and the spacing on the at least two adjacent layers is arranged in a one-to-one opposite manner along the radial direction of the winding core so as to form at least one channel extending along the radial direction.

According to the pole piece disclosed by the utility model, after the pole piece is wound into the winding core, the intervals on at least two adjacent layers are arranged in a one-to-one opposite mode along the radial direction of the winding core to form at least one channel extending along the radial direction, so that the intervals on the at least two adjacent layers cannot be misplaced, the circulation paths of water vapor and electrolyte on the at least two adjacent layers are shortened, and the subsequent water vapor removal speed and the subsequent liquid injection speed are improved.

According to some embodiments of the utility model, the setting of the spacing further satisfies: the channels are provided with symmetrical planes, the symmetrical planes pass through the axis of the winding core, and all the intervals on the same channel are symmetrically arranged relative to the symmetrical planes, so that all the intervals on the same channel are in one-to-one correspondence, and the channels are provided with the largest dimension, thereby shortening the flow paths of water vapor and electrolyte on all layers, and improving the follow-up water vapor removal speed and the liquid injection speed.

According to some embodiments of the utility model, the setting of the spacing further satisfies: the channel is fan-shaped, is convenient for processing, and is favorable for the circulation of electrolyte and water vapor.

According to some embodiments of the present utility model, the dimensions of the tabs and the spaces along the length direction of the main sheet area are respectively a width L1 and a width L2, N channels are formed when the pole piece is wound into the winding core, N is a positive integer greater than or equal to 1, and the single-layer perimeter of the main sheet area of the layer where the spaces are located is w; the width L1 of the tab and the width L2 of the interval on the same layer satisfy the following conditions: l2=w1/x, x is a positive integer greater than or equal to 2; l1=1/N (w-l2×n) such that the ratio of the pitch width on each layer to the circumference of the layer is the same, such that the increasing pitch size in the radial direction of the winding core facilitates the circulation of electrolyte and moisture. The ratio of the total width of the tabs to the perimeter of the layer is also the same, and when there are multiple tabs on the same layer, the width of each tab is the same.

According to some embodiments of the utility model, the main panel has, along its length, a first end and a second end disposed opposite each other, the first end being disposed adjacent to the axis of the winding core when wound into the winding core, the second end being disposed away from the axis of the winding core; forming a blank area between the first end and the tab nearest to the first end on the long edge of the pole piece provided with the tab; when the pole piece is wound into the winding core, at least the innermost layer of the pole piece is provided with a blank area. By arranging the blank area in the length direction of the main sheet area, when the pole piece is wound into a winding core, at least the pole piece of the innermost layer is provided with the blank area, so that the upper and lower channels between the pole piece of the innermost layer and the diaphragm can not be blocked in pole ear flattening, and the circulation of water vapor and electrolyte of the pole piece of the innermost layer is facilitated.

According to some embodiments of the utility model, when the pole piece is wound into the winding core, the pole piece of the Y layer from the first end is the blank area, and Y is any natural number from 5 to 20. The empty area is arranged on the main sheet area, 5-20 layers of electrodeless lug layers close to the winding core are formed after the empty area is wound, and the pole pieces of the electrodeless lug layers and the upper and lower parts of the diaphragm do not have pole lugs participating in the rolling operation, so that a channel along the axial direction of the winding core is formed, and the circulation of water vapor and electrolyte of the multi-layer pole pieces in the inner ring of the winding core is facilitated.

According to some embodiments of the present utility model, the number of the channels is 1, 2 or 3, and the different requirements of the water vapor removal speed and the liquid injection speed can be adapted by setting different channel numbers.

According to some embodiments of the present utility model, when the number of the channels is at least two, the at least two channels are symmetrically distributed with respect to the axis of the winding core, so that the channels are uniformly distributed, which is beneficial to uniform removal of water vapor and uniform injection of electrolyte, and improves drying and liquid injection efficiency.

An electrode assembly according to an embodiment of the second aspect of the present utility model includes a positive electrode tab, a negative electrode tab, and a separator, at least one of the positive electrode tab and the negative electrode tab being the tab described in the above embodiment.

According to the winding core provided by the embodiment of the utility model, by adopting the pole piece, the electrode lug is flattened, the electrode lug state is reserved at the position where the electrode lug on the flattening surface participates in flattening, and the channels in the vertical direction between the diaphragm and the positive pole piece and/or the negative pole piece are formed at intervals, so that the water vapor removal rate and the liquid injection rate are improved, and the production efficiency of the winding core is improved.

A battery cell according to an embodiment of the third aspect of the present utility model includes a housing having an opening; an electrode assembly, which is the electrode assembly in the above embodiment, the electrode assembly being housed in the case; and an end cap covering the opening to cover the electrode assembly in the case.

According to the battery cell provided by the embodiment of the utility model, the rate of removing water vapor and the liquid injection rate are improved by adopting the electrode assembly, and the production efficiency of the battery cell is improved.

The battery module according to the embodiment of the fourth aspect of the present utility model includes the battery cells in the above-described embodiments.

According to the battery module provided by the embodiment of the utility model, the production efficiency of the battery module is improved by adopting the battery cell.

An electric device according to an embodiment of a fifth aspect of the present utility model includes the battery module in the above embodiment.

According to the electric equipment provided by the embodiment of the utility model, the battery module is adopted, so that the production efficiency of the electric equipment is improved.

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

FIG. 1 is a schematic illustration of a pole piece according to one embodiment of the present utility model;

FIG. 2 is a first schematic view of an end portion of an electrode assembly according to one embodiment of the utility model;

FIG. 3 is a second schematic view of an end portion of an electrode assembly according to one embodiment of the utility model;

FIG. 4 is a third schematic view of an end portion of an electrode assembly according to one embodiment of the utility model;

FIG. 5 is a schematic illustration of a pole piece according to another embodiment of the present utility model;

fig. 6 is a first schematic view of an end portion of an electrode assembly according to another embodiment of the present utility model;

fig. 7 is a first schematic view of an end portion of an electrode assembly according to another embodiment of the present utility model;

fig. 8 is a first schematic view of an end portion of an electrode assembly according to another embodiment of the present utility model;

fig. 9 is a schematic view of a battery cell according to an embodiment of the present utility model;

fig. 10 is a schematic view of a battery module according to an embodiment of the present utility model;

fig. 11 is a schematic diagram of a powered device according to an embodiment of the utility model.

Reference numerals:

pole piece 100,

A main panel 1, a first end 11, a second end 12, a blank area 13,

2 electrode lugs, a spacing 3, a channel 4,

Electrode assembly 200,

Battery cell 300, housing 201, end cap 202,

A battery module 400,

Powered device 500.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

The pole piece 100, the electrode assembly 200, the battery cell 300, the energy storage device 400, and the electric device 500 according to the embodiment of the present utility model are described below with reference to the accompanying drawings.

As shown in fig. 1 and 5, a pole piece 100 according to an embodiment of the first aspect of the present utility model includes a main tab 1 and a plurality of tabs 2 connected to a long side of the main tab 1, the plurality of tabs 2 are sequentially spaced apart along a length direction of the main tab 1, a space 3 is provided between two adjacent tabs 2, and the setting of the space 3 satisfies the following condition: when the pole piece 100 is wound into a winding core, the main piece area 1 is wound into a plurality of layers, at least two adjacent layers are provided with pole lugs 2 and spacing 3, and the spacing 3 on the at least two adjacent layers are arranged in a one-to-one opposite manner along the radial direction of the winding core so as to form at least one channel 4 extending along the radial direction.

Specifically, as shown in fig. 1 and 5, the pole piece 100 in the embodiment of the present utility model includes a main sheet area 1, and the main sheet area 1 may be wound to form a winding core. The main sheet region 1 includes long sides and short sides, and the long sides are wound around the short sides as axes. The long edge of the main sheet area 1 is connected with a plurality of lugs 2, the lugs 2 are sequentially arranged at intervals along the length direction of the main sheet area 1, a distance 3 is arranged between two adjacent lugs 2, the distance 3 is the distance between two adjacent lugs 2 along the length direction of the main sheet area 1, and the following conditions are met by the arrangement of the distance 3: when the pole piece 100 is wound into a winding core, the main piece area 1 is wound into a plurality of layers, at least two adjacent layers are provided with the pole lugs 2 and the spacing 3, and the spacing 3 on the at least two adjacent layers are arranged in a one-to-one opposite manner along the radial direction of the winding core so as to form at least one channel 4 extending along the radial direction, so that the spacing 3 on the at least two adjacent layers cannot be misplaced, the circulation paths of water vapor and electrolyte on the at least two adjacent layers are shortened, and the subsequent water vapor removal speed and the liquid injection speed are improved.

Therefore, according to the pole piece 100 disclosed by the utility model, after the pole piece 100 is wound into the winding core, the intervals 3 on at least two adjacent layers are oppositely arranged one by one along the radial direction of the winding core to form at least one channel 4 extending along the radial direction, so that the intervals 3 on at least two adjacent layers cannot be misplaced, the flow paths of water vapor and electrolyte on at least two adjacent layers are shortened, and the subsequent water vapor removal speed and the subsequent liquid injection speed are improved.

In some embodiments of the present utility model, as shown in fig. 2, 3, 4, 6, 7 and 8, the arrangement of the spacing 3 further satisfies: the channels 4 are provided with symmetry planes, the symmetry planes pass through the axis of the winding core, and all the intervals 3 on the same channel 4 are symmetrically arranged relative to the symmetry planes, so that all the intervals 3 on the same channel 4 are uniform and correspond to each other, and the channel 4 has the largest size, thereby shortening the flow paths of water vapor and electrolyte on all layers, and improving the speed of removing the water vapor and the liquid injection rate.

In some embodiments of the present utility model, as shown in fig. 2, 3, 4, 6, 7 and 8, the channel 4 is fan-shaped, which is convenient for processing and facilitates the circulation of electrolyte and moisture.

Specifically, in the radial direction of the winding core, the size of the interval 3 is gradually increased, and the size of the interval 3 of the inner layer of the winding core in the adjacent winding core layers is smaller than the size of the interval 3 of the outer layer of the winding core, so that the larger the size of the interval 3 of the winding core layer with larger circumference is, the circulation of electrolyte and water vapor is facilitated, and the water vapor removal speed and the liquid injection speed are improved.

Of course, the present application is not limited thereto; in other embodiments, the spacing 3 is the same size in the radial direction of the winding core.

In some embodiments of the present utility model, as shown in fig. 1 and fig. 5, the dimensions of the tab 2 and the space 3 along the length direction of the main sheet area 1 are respectively the width L1 and the width L2, and as shown in fig. 2, fig. 3, fig. 4, fig. 6, fig. 7 and fig. 8, when the pole piece 100 is wound into a winding core, N channels 4 are formed, N is a positive integer greater than or equal to 1, and the single-layer circumference of the main sheet area 1 of the layer where the space 3 is located is w; the width L1 of the tab 2 and the width L2 of the interval 3 on the same layer satisfy the following conditions: l2=w1/x, x is a positive integer greater than or equal to 2, x is the fraction dividing the single-layer circumference of the winding core; l1=1/N (w-l2×n) such that the ratio of the width of the space 3 on each layer to the circumference of the layer is the same, so that the increasing size of the space 3 in the radial direction of the winding core is advantageous for the circulation of electrolyte and moisture. The ratio of the total width of the tabs 2 to the circumference of the layer is also the same, and when there are a plurality of tabs 2 on the same layer, the width of each tab 2 is the same.

It can be understood that from the aspect of improving the circulation rate of the water vapor and the electrolyte, the larger the width of the space 3, the better the overall width of the tab 2 from the aspect of connecting the winding core and the stability of the battery current collecting disc, and comprehensively considering the improvement of the circulation rate of the water vapor and the electrolyte and the stability of the connection of the winding core and the battery current collecting disc, in the implementation of the application, the width of the single space 3 on a single layer is w 1/36-w 1/6, that is, 6 is less than or equal to x is less than or equal to 36, and x is an integer, for example, x can be 6, 8, 10, 12, 24, 27, 36 and the like. The single-layer circumference of the winding core may be divided into x parts, and may be equally divided or unequally divided.

In some embodiments of the utility model, as shown in figures 1 and 5, the main panel 1 has, along its length, a first end 11 and a second end 12 arranged opposite each other, the first end 11 being arranged adjacent to the axis of the winding core and the second end being arranged away from the axis of the winding core when wound into the winding core; as shown in fig. 5, on the long side of the pole piece 100 where the tab 2 is provided, a blank area 13 is formed from the first end 11 to the tab 2 nearest to the first end; when the pole piece 100 is wound into a winding core, at least the innermost pole piece 100 is provided with a blank area 13. By arranging the blank area 13 in the length direction of the main sheet area 1, when the pole piece 100 is wound into a winding core, at least the pole piece 100 of the innermost layer is provided with the blank area 13, so that the upper and lower channels 4 between the pole piece 100 of the innermost layer and the diaphragm cannot be blocked in the process of flattening the pole lugs 2, and the circulation of water vapor and electrolyte of the pole piece 100 of the innermost layer is facilitated, as shown in fig. 11.

In some embodiments of the present utility model, as shown in fig. 6, 7 and 8, when pole piece 100 is wound into a winding core, the pole pieces of the Y layer from first end 11 are blank 13, and Y is any natural number from 5 to 20. By arranging the blank area 13 on the first end 11 of the main sheet area 1, the length of the blank area 13 on the main sheet area 1 is L0, 5-20 layers of electrodeless ear layers close to the winding core are formed after the blank area 13 is wound, and the polar pieces 100 of the electrodeless ear layers and polar ears 2 which do not participate in the rolling operation are arranged above and below the diaphragm, so that a channel 4 along the axial direction of the winding core is formed, and the circulation of water vapor and electrolyte of the multi-layer polar pieces 100 of the inner ring of the winding core is facilitated.

Y represents the number of winding core layers.

It will be appreciated that the value of Y may be determined based on the number of core layers. For example, when the number of winding core layers is small, the value of Y may be 5 to 13, for example, the value of Y is 5, 7, 10, 13, etc.; when the number of winding core layers is large, the value of Y may be 13-20, for example, Y is 15, 1720, etc.

In some embodiments of the present utility model, as shown in fig. 2, 3, 4, 6, 7 and 8, the number of channels 4 is 1 or 2 or 3, and the water removal rate and the liquid injection rate can be adapted to different requirements by setting different numbers of channels 4.

For example, when the number of winding core layers is small and the requirements on the water vapor removal speed and the liquid injection speed are low, a channel 4 can be arranged, as shown in fig. 2 and 6, and the width of the space 3 on the single-layer pole piece 100 on the channel 4 is 1/36-1/6 of the circumference of the single-layer pole piece 100; when the number of winding core layers is large and the requirements on the water vapor removal speed and the liquid injection speed are high, two channels 4 can be arranged, as shown in fig. 3 and 7, and the width of each interval 3 on the single-layer pole piece 100 on the channel 4 is 1/36-1/6 of the circumference of the single-layer pole piece 100; when the number of winding core layers is large and the requirements on the water vapor removal speed and the liquid injection speed are high, three channels 4 can be arranged, as shown in fig. 4 and 8, and the width of each interval 3 on the single-layer pole piece 100 on the channel 4 is 1/36-1/6 of the circumference of the single-layer pole piece 100.

In some embodiments of the present utility model, as shown in fig. 3, 4, 7 and 8, when the number of channels 4 is at least two, at least two channels 4 are symmetrically distributed with respect to the axis of the winding core, so that the channels 4 are uniformly distributed, which is beneficial to uniform removal of water vapor and uniform injection of electrolyte, and improves drying and liquid injection efficiency.

Specifically, when the number of the passages 4 is two, as shown in fig. 3 and 7, the two passages 4 are symmetrically arranged at the end of the winding core, and when the number of the passages 4 is three, as shown in fig. 4 and 8, the three passages 4 are uniformly distributed on the circumference of the end of the winding core.

Of course, the present application is not limited thereto; in other embodiments, the number of channels 4 may also be more than three, for example four, five, six, etc. When the number of channels 4 is large, the width of the space 3 can be adaptively reduced in consideration of the stability of the tab 2 connecting the winding core and the current collecting plate.

The electrode assembly 200 according to the second aspect of the embodiment of the present utility model includes the positive electrode tab 100, the negative electrode tab 100, and the separator, at least one of the positive electrode tab 100 and the negative electrode tab 100 being the tab 100 in the above-described embodiment.

According to the winding core provided by the embodiment of the utility model, after the pole piece 100 is adopted to knead the pole lugs 2, the state of the pole lugs is reserved at the position where the pole lugs on the knead surface participate in the kneading, and the space 3 forms the channel 4 in the up-down direction between the diaphragm and the positive pole piece 100 and/or the negative pole piece 100, so that the rate of removing water vapor and the liquid injection rate are improved, and the production efficiency of the winding core is improved.

In some embodiments, the positive electrode tab 100, the separator, and the negative electrode tab 100 are sequentially stacked and extend in the same direction, and the separator is disposed between the positive electrode tab 100 and the negative electrode tab 100 to separate the positive electrode tab 100 from the negative electrode tab 100, preventing the positive electrode from contacting the negative electrode to cause a short circuit. Specifically, the separator is made of a nonconductive material, and has a function of allowing electrolyte ions to pass through.

In some embodiments, one end of the positive electrode tab 100 is provided with a plurality of positive electrode tabs 2, one end of the negative electrode tab 100 is provided with a plurality of negative electrode tabs 2, and the positive electrode tabs 2 and the negative electrode tabs 2 are respectively located at two axial ends of the electrode assembly 200.

In some embodiments, the positive electrode tabs 2 and the negative electrode tabs 2 are disposed opposite to each other at two axial ends of the electrode assembly 200, so that the upper and lower channels 4 are communicated in the axial direction, which improves the rate of removing water vapor and the liquid injection rate.

As shown in fig. 9, a battery cell 300 according to an embodiment of the third aspect of the present utility model includes a case 201, an electrode assembly 200 in the above-described embodiment, and an end cap 202, the case 201 having an opening, the electrode assembly 200 being received in the case 201, the end cap 202 covering the opening to cover the electrode assembly 200 in the case 201.

According to the battery cell 300 of the embodiment of the utility model, by adopting the electrode assembly 200, the rate of removing moisture and the liquid injection rate are improved, and the production efficiency of the battery cell 300 is improved.

In some embodiments, the housing 201 employs a single pass aluminum shell.

As shown in fig. 10, a battery module 400 according to a fourth aspect of the present utility model includes the battery cells 300 of the above-described embodiments.

According to the battery module 400 of the embodiment of the utility model, the production efficiency of the battery module 400 is improved by adopting the battery cells 300.

As shown in fig. 11, a powered device 500 according to a fifth aspect of the present utility model includes the battery module 400 in the above embodiment.

In this embodiment, the structure of the powered device 500 is not limited. For example, powered device 500 may be a mobile device such as a vehicle, a watercraft, a small aircraft, etc., that includes a power source including battery module 400 as described above. The electric power provided by the battery module 400 provides driving force for the electric device 500. The mobile device may be a pure electric device, that is, the driving force of the electric device 500 is all electric energy, and the power source only includes the battery module 400. The mobile device may also be a hybrid power device, and the power source includes a battery module 400 and other power devices such as an engine. Taking the vehicle shown in fig. 11 as an example, in some embodiments, the electric device 500 is a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, an extended range vehicle, an electric tricycle, a two-wheel electric vehicle, or the like.

According to the electric equipment 500 provided by the embodiment of the utility model, the battery module 400 is adopted, so that the production efficiency of the electric equipment 500 is improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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 (12)

1. The utility model provides a pole piece, its characterized in that, the pole piece includes main sheet district (1) and connects a plurality of utmost point ear (2) on the long edge of main sheet district (1), a plurality of utmost point ears (2) are followed the length direction of main sheet district (1) interval sets gradually, adjacent two have interval (3) between utmost point ear (2), just the setting of interval (3) satisfies following condition:

when the pole piece is wound into a winding core, the main piece area (1) is wound into a plurality of layers, the pole lugs (2) and the spaces (3) are arranged on at least two adjacent layers, and the spaces (3) on the at least two adjacent layers are oppositely arranged one by one along the radial direction of the winding core so as to form at least one channel (4) extending along the radial direction.

2. Pole piece according to claim 1, characterized in that the arrangement of the spacing (3) further satisfies:

the channels (4) are provided with symmetry planes passing through the axis of the winding core, and all the spaces (3) on the same channel (4) are symmetrically arranged relative to the symmetry planes.

3. Pole piece according to claim 2, characterized in that the arrangement of the spacing (3) further satisfies: the channel (4) is fan-shaped.

4. The pole piece according to claim 1, wherein the dimensions of the pole lug (2) and the space (3) along the length direction of the main sheet region (1) are respectively a width L1 and a width L2, N channels (4) are formed when the pole piece is wound into the winding core, N is a positive integer greater than or equal to 1, and the single-layer perimeter of the main sheet region (1) of the layer where the space (3) is located is w;

the width L1 of the tab (2) and the width L2 of the spacing (3) on the same layer satisfy the following conditions:

l2=w1/x, x is a positive integer greater than or equal to 2; l1=1/N (w-l2×n).

5. A pole piece according to any of claims 1-4, characterized in that the main segment (1) has a first end (11) and a second end (12) arranged opposite each other along its length, the first end (11) being arranged adjacent to the axis of the winding core when wound into the winding core, the second end (12) being arranged away from the axis of the winding core;

a blank area (13) is formed between the first end (11) and the tab (2) nearest to the first end (11) on the long side of the pole piece, provided with the tab (2);

when the pole piece is wound into the winding core, at least the innermost layer of the pole piece is provided with the blank area (13).

6. A pole piece according to claim 5, characterized in that the pole piece is provided with the blank (13) on the pole piece of the Y layer starting from the first end (11) when wound into the winding core, Y being any natural number from 5 to 20.

7. Pole piece according to any of claims 1-4, characterized in that the number of channels (4) is 1 or 2 or 3.

8. Pole piece according to any of claims 1-4, characterized in that at least two channels (4) are arranged centrally symmetrically with respect to the axis of the winding core when the number of channels (4) is at least two.

9. An electrode assembly characterized by comprising a positive electrode sheet, a negative electrode sheet and a separator, at least one of the positive electrode sheet and the negative electrode sheet being a sheet (100) according to any one of claims 1-8.

10. A battery cell, comprising:

a housing (201), the housing (201) having an opening;

an electrode assembly (200), the electrode assembly (200) being an electrode assembly (200) according to claim 9, the electrode assembly (200) being housed within the housing (201);

an end cap (202), the end cap (202) covering the opening to cap the electrode assembly (200) in the case (201).

11. A battery module characterized by comprising the battery cell (300) according to claim 10.

12. A powered device, characterized by comprising a battery module (400) according to claim 11.

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