CN218004916U - Pole piece, electric core structure and battery and electronic equipment with same - Google Patents

Abstract

The utility model discloses a pole piece, electric core structure and have its battery, electronic equipment. The pole piece includes the mass flow body and active substance layer, and the mass flow body includes the mass flow body part, and active substance layer establishes on the at least one side surface of the mass flow body, and active substance layerThe current collector comprises a first active material layer, a second active material layer and a current collector body part, wherein the first active material layer is arranged on the current collector body part; the average thickness of the first active material layer is h1, the thickness at an arbitrary position on the first active material layer is h2,

the utility model discloses pole piece, first active material layer thickness are whole more even, and whole roughness is high when the range upon range of setting up processing electricity core structure of pole piece like this, effectively avoids the too big problem in local clearance between the pole piece, improves electricity core structure electrical property.

Description

Pole piece, electric core structure and battery and electronic equipment with same

Technical Field

The utility model relates to a battery technology field has and relates to a pole piece, electric core structure and have its battery, electronic equipment.

Background

The battery is widely applied to the fields of electronic products, new energy automobiles and the like at present as an energy storage device.

Among the prior art scheme, most electric core structures of battery are by the range upon range of setting of positive pole piece and negative pole piece, and the anodal mass flow body of positive pole piece covers has anodal active material layer, and the negative pole mass flow body of negative pole piece covers has negative pole active material layer. The positive electrode active material layer or the negative electrode active material layer is usually formed by coating with a slurry. After the existing process standard is finished, the local positions of the positive pole piece and the negative pole piece are inevitably too large in gap, so that the flatness of the battery cell structure is influenced, the charged ion transmission path of the battery cell structure during working is increased, and the performance of the battery cell structure is adversely affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a pole piece uses this kind of pole piece to be favorable to keeping the roughness of electric core structure, improves the wholeness ability.

This application still aims at providing the electric core structure that has above-mentioned pole piece to improve electric core structure roughness.

The application also refers to a battery provided with the battery cell structure.

The present application is also directed to an electronic device having the above battery.

According to the utility model discloses pole piece, pole piece includes the mass flow body and active substance layer, the mass flow body includes the mass flow body part, active substance layer establishes at least of mass flow bodyOn one side surface, the active material layer comprises a first active material layer disposed on the current collector body portion; the first active material layer has an average thickness h1, and the first active material layer has a thickness h2 at any position,

according to the utility model discloses pole piece, through the fluctuation range of the thickness of the optional position department of the first active material layer of strict limitation, make the first active material layer thickness of pole piece whole even, when the pole piece is range upon range of when setting up processing electric core structure, can make the whole roughness height of electric core structure correspondence mass flow body portion department, effectively avoid the too big problem in local clearance between the pole piece, be favorable to shortening electric core structure during operation lithium ion transmission route, improve electric core structure electrical property.

In some embodiments, the current collector further comprises a tab extending from the current collector main body portion, the active material layer further comprises a second active material layer connected to the first active material layer and disposed on the tab, the second active material layer has a thickness h3 at any position, and h3 is ≦ h1 × 97%.

In some embodiments, the pole piece further comprises an insulating layer, the insulating layer is arranged on the pole lug, and the insulating layer is connected with one end, far away from the first active material layer, of the second active material layer.

Specifically, the insulating layer satisfies at least one of the following parameter conditions:

the size of the insulating layer in the extension direction of the lug is L2, and L2 is more than or equal to 0.3mm and less than or equal to 2.0mm;

the thickness of the insulating layer is H1, and H1 is set to be more than or equal to 10 mu m and less than or equal to H1 and less than or equal to 30 mu m.

Further, the first active material layer and the second active material layer are active material coatings made of the same material.

According to the utility model discloses electric core structure, include: the separator comprises a positive pole piece, a negative pole piece and a diaphragm clamped between the positive pole piece and the negative pole piece; the positive electrode plate is the electrode plate described in the above embodiment.

The mass flow body of positive pole piece is the anodal mass flow body, the active substance layer of positive pole piece is anodal active substance layer, the anodal mass flow body includes anodal mass flow body main part and anodal utmost point ear, anodal active substance layer includes first anodal active substance layer and second anodal active substance layer, first anodal active substance layer is established on the anodal mass flow body main part, the anodal active substance layer of second is established on the utmost point ear of positive pole.

The negative pole piece includes negative current collector and negative active material layer, the negative current collector includes negative current collector main part and follows the negative pole utmost point ear that the negative current collector main part extends, the negative active material layer is established on the at least side surface of negative current collector, the negative active material layer includes first negative active material layer and second negative active material layer, first negative active material layer is established on the negative current collector main part, the second negative active material layer with first negative active material layer links to each other and establishes on the negative pole utmost point ear.

According to the utility model discloses electric core structure through the fluctuation range of the first active material layer thickness on the strict restriction anodal piece, makes on the anodal piece first active material layer thickness whole even, when the pole piece is range upon range of when setting up processing electric core structure, can make the whole roughness height of electric core structure correspondence mass flow body part department, effectively avoids the too big problem in local clearance between the pole piece, is favorable to shortening electric core structure during operation lithium ion transmission route, improves electric core structural performance.

In some embodiments, the positive electrode tab and the negative electrode tab are located on the same side of the cell structure, and the first negative electrode active material layer is close to an end of the second negative electrode active material layer and exceeds an end of the second positive electrode active material layer away from the first positive electrode active material layer.

Specifically, when the positive electrode plate further comprises an insulating layer, the insulating layer is arranged on the positive electrode tab, and the insulating layer is connected with one end of the second positive electrode active material layer, which is far away from the first positive electrode active material layer;

one end of the insulating layer, which is far away from the second positive electrode active material layer, exceeds the end part, which is far away from the first positive electrode active material layer, of the second negative electrode active material layer.

Further, the cell structure satisfies at least one of the following parameter conditions:

the size of the second positive electrode active material layer in the extension direction of the positive electrode lug is L1, and L1 is more than 0 and less than or equal to 1.0mm;

the size of the second negative electrode active material layer in the extending direction of the negative electrode lug is L3, and the L3 is more than or equal to 0mm and less than or equal to 1.5mm.

According to the utility model discloses the battery, include according to above-mentioned embodiment the electric core structure.

According to the utility model discloses battery, through setting up above-mentioned electric core structure, reduced the technology processing procedure degree of difficulty, be favorable to improving electrical properties.

According to the utility model discloses electronic equipment, include according to above-mentioned embodiment the battery.

According to the utility model discloses electronic equipment, through setting up above-mentioned battery, because the electrical property of battery can improve, consequently can improve the persistence and the reliability of its power consumption.

Additional aspects and advantages of the invention 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 invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a cell structure (not shown) according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a cell structure according to an embodiment of the present invention;

fig. 3a is a schematic view of a positive electrode plate according to an embodiment of the present invention;

fig. 3b is a schematic view of a negative electrode plate according to an embodiment of the present invention;

fig. 4a is a schematic view of a positive electrode sheet according to another embodiment of the present invention;

fig. 4b is a schematic view of a negative electrode plate according to another embodiment of the present invention;

fig. 5a is a schematic view of a positive electrode sheet according to another embodiment of the present invention;

fig. 5b is a schematic view of a negative electrode tab according to another embodiment of the present invention;

fig. 6a is a schematic view of a positive electrode plate according to still another embodiment of the present invention;

fig. 6b is a schematic view of a negative electrode plate according to still another embodiment of the present invention;

fig. 7a is a schematic view of a positive electrode sheet having a plurality of positive electrode tabs according to an embodiment of the present invention;

fig. 7b is a schematic diagram of a negative electrode sheet having a plurality of negative electrode tabs according to an embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of a pole piece according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of another pole piece according to an embodiment of the present invention.

Reference numerals:

a pole piece 00,

A current collector 01, a current collector main body portion 011, a tab 012,

Active material layer 02, first active material layer 023, second active material layer 024, cell structure 100, and,

A positive pole piece 10,

A positive electrode collector 11, a positive electrode collector main body 111, a positive electrode tab 112,

A positive electrode active material layer 12, a first positive electrode active material layer 123, a second positive electrode active material layer 124,

An insulating layer 15,

A negative pole piece 20,

A negative electrode collector 21, a negative electrode collector main body part 216, a negative electrode tab 217,

The anode active material layer 22, the first anode active material layer 228, the second anode active material layer 229,

A diaphragm 30.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Pole piece 00 according to an embodiment of the present invention is described below with reference to fig. 8-9.

Referring to fig. 8, a pole piece 00 includes a current collector 01 and an active material layer 02. The current collector 01 includes a current collector main body portion 011. In some embodiments, the current collector 01 further includes a tab 012, and the tab 012 extends from the current collector main body portion 011. Optionally, the current collector main body portion 011 and the tab 012 are integrally formed, that is, integrally formed by the same material, which is beneficial to reducing burrs generated between the current collector main body portion 011 and the tab 012. Certainly, this application does not exclude that some schemes collect the body portion 011 and the utmost point ear 012 to connect into an organic whole after independently processing respectively.

The active material layer 02 is provided on at least one side surface of the current collector 01, where the current collector 01 has two opposite surfaces, the active material layer 02 may be provided only on one side surface of the current collector 01, and the active material layer 02 may be provided on both of the opposite surfaces of the current collector 01. When the active material layers 02 are arranged on the two surfaces of the current collector 01, the lithium ion conduction paths are more and smooth, and the energy density of the battery cell structure 100 is guaranteed.

The active material layer 02 includes a first active material layer 023, which is provided on the current collector main body portion 011. In some embodiments, the active material layer 02 further includes a second active material layer 024, and the second active material layer 024 is connected to the first active material layer 023 and is provided on the tab 012. Alternatively, coating of an active material with the same material as that of the first active material layer 023 and the second active material layer 024 is advantageous in improving the structural reliability of the junction of the first active material layer 023 and the second active material layer 024 and reducing burrs generated therein. It is needless to say that the present application does not exclude a case where the first active material layer 023 and the second active material layer 024 are separately processed and integrated. In the present application, it is not excluded that the active material layer 02 includes only the first active material layer 023 provided on the current collector main body portion 011, and the second active material layer 024 is not included.

The current collector 01 may be made of a material having high electrical conductivity, for example, a metal member such as aluminum or copper. The tab 012 is provided for electrically connecting the battery cell structure 100 to an external structure.

The active material layer 02 includes an active material, a conductive agent, and a binder. Alternatively, the active material layer 02 is provided on the current collector 01 by coating. Of course, the present application is not limited to the active material layer 02 being provided on the current collector 01 by other means known in the art, for example, the active material layer 02 being provided on the current collector 01 by spraying.

In the present embodiment, as shown in fig. 8, the first active material layer 023 has an average thickness h1, the thickness at any position on the first active material layer 023 is h2,

that is, the fluctuation width of the thickness at any position on the first active material layer 023 to the average thickness h1 in the present application is not more than 3%.

Thus, the thickness of the first active material layer 023 of the pole piece 00 is made uniform as a whole by strictly limiting the fluctuation range of the thickness h2 at any position of the first active material layer 023. Thus, when the pole pieces 00 are arranged in a stacked manner to process the cell structure 100, the overall flatness of the main body part of the cell structure 100 can be high, the problem of overlarge local gap between the pole pieces 00 can be effectively avoided, and the lithium ion transmission path can be shortened when the cell structure 100 works.

It can be understood that the first active material layer 023 is even, which is beneficial to the consistency of the electric conductivity of the first active material layer 023 in the charging and discharging processes of the pole piece 00, reduces the electrochemical reaction of different positions of the electric conductivity, reduces the local overcharge and overdischarge phenomena, and also reduces the precipitation of lithium metal. Therefore, the improvement in the cell structure 100 performance is improved as a whole.

The implementation of the scheme of the application puts higher requirements on the processing and detection processes of the pole piece 00. Taking the active material layer 02 as an example, the thickness of the active material layer is ensured by controlling the coating thickness of the slurry when the thickness of the pole piece is controlled. However, the existing process cannot control the hardening degree of the slurry at each position on the current collector to be consistent, and cannot completely prevent the slurry from flowing, so that the thickness of the coated slurry is kept uniform, but the thickness fluctuation range of the generated active material layer is large.

In the scheme of the application, the fluctuation range of the thickness h2 at any position on the first active material layer 023 relative to the average thickness h1 is limited to be not more than 3%, when the thickness is controlled, the thickness size after the slurry is completely hardened to generate the active material layer 02 is taken as thickness data, and the part of the active material layer 02 with the fluctuation range of the thickness not more than 3% is kept as the first active material layer 023, so that the thickness average of the first active material layer 023 is effectively ensured.

In the active material layer 02 formed in actual production, it is inevitable that the thickness at the edges drops abruptly, and a portion of the active material layer 02 at the edges where the fluctuation range of the thickness exceeds the requirement can be cut off in production.

In some embodiments, the thickness at any position on the second active material layer 024 is h3, and h3 ≦ h1 × 97%. It is understood that a lithium ion deintercalation process substantially occurs at the first active material layer 023 during charge and discharge. When the active material layer 02 is processed, the edge of the active material layer 02 that has been initially processed has a thinned region with a steeply decreasing thickness. When the thinned region is cut out, the thinned region on the tab 012 forms a second active material layer 024. The thinned region is cut away at a position other than the tab 012, which corresponds to the thinned region at the primary edge of the first active material layer 023, and the thickness of the remaining first active material layer 023 is uniform as a whole.

In this embodiment, the thickness h3 of the second active material layer 024 is limited to be smaller than 97% of the average thickness h1 of the first active material layer 023, so that the entire amount of the active material layer 02 can be reduced and the cost can be reduced.

In some embodiments, as shown in fig. 9, the pole piece 00 further includes an insulating layer 15, the insulating layer 15 is disposed on the tab 012, and the insulating layer 15 is connected to an end of the second active material layer 024 away from the first active material layer 023. The insulating layer 15 can further reduce or reduce burrs generated when the tab 012 is cut. Moreover, when the pole pieces 00 are laminated, the tab 012 of one pole piece 00 may be laminated on the tab 012 of the other pole piece 00, and the arrangement of the insulating layer 15 can effectively reduce the short circuit condition when the tab 012 is laminated.

Optionally, the dimension of the insulating layer 15 in the extending direction of the tab 012 is L2, and 0.3mm ≦ L2 ≦ 2.0mm is satisfied. Namely, the dimension L2 of the insulating layer 15 in the Z direction satisfies 0.3mm < L2 < 2.0mm. So set up, be favorable to improving electric core structure 100's energy density, can guarantee simultaneously, when two poles of the earth ear 012 bump mutually, longer insulating layer 15 can effectively prevent two utmost points ear 012 short circuit.

Alternatively, the insulating layer 15 has a thickness H1, and H1 is set to 10 μm ≦ H1 ≦ 30 μm. The thickness of the insulating layer 15 here refers to the dimension of the insulating layer 15 in the vertical direction.

It can be understood that burrs are inevitably generated on the current collector 01 when the pole piece 00 is cut. By setting the thickness of the insulating layer 15 to at least more than 10 μm, it is possible to achieve a preferable effect of reducing burrs and avoiding risks due to the burrs. By limiting the thickness of the insulating layer 15 to be not more than 30 μm, the problem that the strength of the tab 012 is too high due to the excessive thickness of the insulating layer 15 is avoided, that is, the insulating layer 15 is arranged in such a way that the tab 012 is easily bent. Reasonably limiting the thickness of the insulating layer 15, the occupied space of the insulating layer 15 can be reduced, and the energy density of the battery cell structure 100 is improved.

In the solution of the present application, the tab 012 may be rectangular, and has a simple shape, which saves material. Of course, the shape of the tabs 012 in the present embodiment is not limited thereto, and at least one of the tabs 012 may have an isosceles trapezoid shape.

When the tab 012 is isosceles trapezoid, the edge of the tab 012 connecting the current collector main body portion 011 is a lower bottom, the edge of the tab 012 far away from the current collector main body portion 011 is an upper bottom, and the lower bottom is longer than the upper bottom. The waist length of the tab 012 is not limited, and is generally affected by the mounting conditions.

With utmost point ear 012 so setting up, utmost point ear 012 is wider with the mass flow body portion 011 junction, is favorable to the current flow transition, and this junction broad is favorable to improving junction structural strength moreover, reduces utmost point ear 012 fracture risk here.

Alternatively, when the tab 012 has an isosceles trapezoid shape, the bottom angle of the tab 012 is 70 ° to 90 °, for example, the bottom angle of the tab 012 is 71 °, 75 °, 78 °, 82 °, 86 °, 89 °, or the like. It can be understood that the tab 012 has a long length in the Z direction, which facilitates connection with an external terminal. Therefore, the base angle of the tab 012 should not be too small, so that the width of the tab 012 can be reduced, and the occupied space can be reduced.

Of course, the present disclosure is not limited thereto, and in other cases, at least one of the tabs 012 may have an arc shape, an L shape, or the like.

A cell structure 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 7 b.

According to the utility model discloses electric core structure 100, refer to fig. 1 and fig. 2, include: positive pole piece 10, negative pole piece 20 and diaphragm 30, diaphragm 30 is sandwiched between positive pole piece 10 and negative pole piece 20.

The positive electrode tab 10 is the tab 00 of the above embodiment. In the positive electrode sheet 10, the current collector 01 is a positive electrode current collector 11, and the active material layer 02 is a positive electrode active material layer 12. In the positive electrode sheet 10, the current collector main portion 011 is a positive electrode current collector main portion 111, and the tab 012 is a positive electrode tab 112. In the positive electrode sheet 10, the first active material layer 023 is a first positive electrode active material layer 123, and the second active material layer 024 is a second positive electrode active material layer 124.

That is, referring to fig. 2 and 3a, the positive electrode sheet 10 includes a positive electrode collector 11 and a positive electrode active material layer 12. The positive electrode collector 11 includes a positive electrode collector main body 111 and a positive electrode tab 112, and the positive electrode tab 112 extends from the positive electrode collector main body 111. Alternatively, the positive electrode collector main body 111 and the positive electrode tab 112 are integrally formed, i.e., are integrally formed by the same material, which is beneficial to reduce the generation of burrs between the positive electrode collector main body 111 and the positive electrode tab 112. Of course, this application does not exclude that in some embodiments, the positive electrode current collector main body 111 and the positive electrode tab 112 are separately processed and then integrally connected.

The positive electrode active material layer 12 is provided on at least one side surface of the positive electrode collector 11, where the positive electrode collector 11 has two opposite surfaces, the positive electrode active material layer 12 may be provided only on one side surface of the positive electrode collector 11, and the positive electrode active material layer 12 may be provided on both opposite surfaces of the positive electrode collector 11.

The positive electrode active material layer 12 includes a first positive electrode active material layer 123 and a second positive electrode active material layer 124, the first positive electrode active material layer 123 being provided on the positive electrode collector main body portion 111, and the second positive electrode active material layer 124 being connected to the first positive electrode active material layer 123 and being provided on the positive electrode tab 112. Alternatively, the first positive electrode active material layer 123 and the second positive electrode active material layer 124 are the same active material layer, i.e., are made of the same material. Advantageously, the first positive electrode active material layer 123 and the second positive electrode active material layer 124 are formed by integrally coating the same active material, which is beneficial to improving the structural reliability of the joint of the first positive electrode active material layer 123 and the second positive electrode active material layer 124, and reducing burrs generated at the joint. Needless to say, the first positive electrode active material layer 123 and the second positive electrode active material layer 124 may be separately processed and integrally connected to each other.

Referring to fig. 2 and 3b, the negative electrode tab 20 includes a negative electrode collector 21 and a negative electrode active material layer 22. The negative electrode collector 21 includes a negative electrode collector main body portion 216 and a negative electrode tab 217, and the negative electrode tab 217 extends from the negative electrode collector main body portion 216. Optionally, the negative electrode current collector main body portion 216 and the negative electrode tab 217 are integrally formed, that is, integrally formed by the same material, which is beneficial to reducing burrs generated between the negative electrode current collector main body portion 216 and the negative electrode tab 217. Certainly, this application does not exclude that, in some schemes, the negative current collector main body portion 216 and the negative electrode tab 217 are separately processed and then connected into a whole.

The anode active material layer 22 is provided on at least one side surface of the anode current collector 21. Here, the anode current collector 21 has two opposite surfaces, the anode active material layer 22 may be provided only on one side surface of the anode current collector 21, and the anode active material layer 22 may be provided on both opposite surfaces of the anode current collector 21.

The anode active material layer 22 includes a first anode active material layer 228 and a second anode active material layer 229, the first anode active material layer 228 is provided on the anode current collector main body part 216, and the second anode active material layer 229 is connected to the first anode active material layer 228 and provided on the anode tab 217. Alternatively, the first anode active material layer 228 and the second anode active material layer 229 are the same active material layer, i.e., are made of the same material. Further alternatively, the first negative electrode active material layer 228 and the second negative electrode active material layer 229 are formed by integrally coating the same active material, which is beneficial to improve the structural reliability of the joint of the first negative electrode active material layer 228 and the second negative electrode active material layer 229 and reduce burrs generated at the joint. Needless to say, the present application does not exclude that the first negative electrode active material layer 228 and the second negative electrode active material layer 229 may be separately processed and integrally connected to each other.

The arrangement of the positive electrode tab 112 and the negative electrode tab 217 is used for circuit connection between the battery cell structure 100 and an external structure. Taking the cell structure 100 as an example of being connected to an external power source, when the battery is charged, current flows from an external circuit into the positive electrode tab 112, passes through the positive electrode tab 10, the electrolyte and the negative electrode tab 20, and then flows out from the negative electrode tab 217.

The positive electrode active material layer 12 and the negative electrode active material layer 22 are made of materials including an active material, a conductive agent, and a binder.

The positive electrode collector 11 and the negative electrode collector 21 may be made of a material having high electrical conductivity, for example, a metal material such as aluminum or copper.

Alternatively, the positive electrode active material layer 12 is provided on the positive electrode collector 11 by coating. Of course, the present application does not limit the positive electrode active material layer 12 to be provided on the positive electrode collector 11 by other means known in the art, for example, the positive electrode active material layer 12 is provided on the positive electrode collector 11 by spraying.

Alternatively, the anode active material layer 22 is provided on the anode current collector 21 by coating. Of course, the present application does not limit the anode active material layer 22 to be provided on the anode current collector 21 by other means known in the art, for example, the anode active material layer 22 is provided on the anode current collector 21 by spraying.

In the present application, the second positive electrode active material layer 124 is disposed on the positive electrode tab 112, and when the positive electrode tab 112 is cut, the existence of the second positive electrode active material layer 124 can reduce or reduce the cutting burr on the positive electrode current collector 11. The second negative active material layer 229 is disposed on the negative tab 217, so that when the negative tab 217 is cut, the cutting burr on the negative current collector 21 can be reduced.

In the present application, as shown in fig. 1 and fig. 2, the positive electrode tab 112 and the negative electrode tab 217 are located on the same side of the cell structure 100. The first anode active material layer 228 is located near the end of the second anode active material layer 229 and extends beyond the end of the second cathode active material layer 124 remote from the first cathode active material layer 123. By the arrangement, lithium ions which are separated from the positive pole piece 10 can be completely embedded into the negative pole piece 20, so that lithium precipitation is avoided, and the electrochemical performance of the battery is improved.

In the description of the present invention, it is to be understood that the terms "thickness", "length", "width", and the like, which indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

According to the utility model discloses electric core structure 100, through the tip that is close to second negative pole active material layer 229 with first negative pole active material layer 228, surpass the tip that first positive pole active material layer 123 was kept away from to second positive pole active material layer 124, can make the lithium ion of deviating from on positive pole piece 10, can all imbed on the negative pole piece 20. The thickness of the first positive electrode active material layer 123 is uniformly set, so that the flatness of the battery cell structure 100 is improved, and an electric ion transmission path is shortened when the battery cell structure 100 works. With the structure, the difficulty of the process is reduced, the influence of the thinning area generated by the first positive active material layer 123 on the performance of the cell structure 100 is reduced, and the performance is improved.

In some embodiments, as shown in fig. 1-3 a, the positive electrode tab 10 further includes an insulating layer 15, the insulating layer 15 is disposed on the positive electrode tab 112, and the insulating layer 15 is connected to an end of the second positive electrode active material layer 124 away from the first positive electrode active material layer 123. The insulating layer 15 can further reduce and reduce burrs generated when the positive electrode tab 112 is cut, and further prevent the burrs on the positive electrode current collector 11 from piercing the separator 30.

Specifically, an end of the insulating layer 15 remote from the second cathode active material layer 124 exceeds an end of the second anode active material layer 229 remote from the first anode active material layer 228. Therefore, the burrs on the positive electrode collector 11 can be further prevented from piercing the separator 30, so that the second negative electrode active material layer 229 is prevented from being in direct contact with the positive electrode tab 112 to cause short circuit, and the safety of the cell structure 100 is improved.

For convenience of description, the extending directions of the positive electrode tab 112 and the negative electrode tab 217 are designated as the direction Z in the drawings, and are shown in fig. 2.

In some embodiments, as shown in fig. 2, the dimension of the second positive electrode active material layer 124 in the extending direction of the positive electrode tab 112 is L1, and satisfies 0 < L1 ≦ 1.0mm. The dimension L1 of the second cathode active material layer 124 is so limited that waste of the cathode active material can be reduced.

In some specific embodiments, as shown in fig. 2, the size of the second anode active material layer 229 in the extending direction of the anode tab 217 is L3, and 0mm ≦ L3 ≦ 1.5mm is satisfied. Here, L3 of the second negative electrode active material layer 229 may be 0, that is, the second negative electrode active material layer 229 may not be provided on the negative electrode tab 217 of the negative electrode tab 20. When the second anode active material layer 229 is provided on the anode tab 217, it is possible to reduce burrs and avoid risks due to the burrs. The dimension L3 of the second anode active material layer 229 is 1.5mm or less, which can reduce waste of the anode active material.

In some embodiments, the second cathode active material layer 124 satisfies 0 < L1 ≦ 1.0mm in the Z-direction dimension L1 on the cathode tab 112, and the second anode active material layer 229 satisfies 0.5mm ≦ L3 ≦ 1.5mm in the Z-direction dimension L3 on the anode tab 217, which may further reduce, reduce burrs generated at the time of cutting, and reduce waste of active material.

In some embodiments, as shown in fig. 2, an insulating layer 15 is provided on the positive electrode tab 112.

Optionally, the dimension of the insulating layer 15 in the extending direction of the positive electrode tab 112 is L2, and 0.3mm ≦ L2 ≦ 2.0mm is satisfied. Namely, the dimension L2 of the insulating layer 15 in the Z direction satisfies 0.3mm < L2 < 2.0mm. So set up, the Z direction size L2 of insulating layer 15 can not be too big, is favorable to improving the energy density of electric core structure 100. The dimension L2 of the insulating layer 15 in the Z direction is not too small, and when the two tabs 012 collide with each other, for example, when the separator 30 is pierced, the insulating layer 15 is set to a size that is favorable for the end of the second negative electrode active material layer 229 to fall onto the insulating layer 15, thereby reducing the probability that the second negative electrode active material layer 229 contacts with the positive electrode tab 112 and is short-circuited.

Alternatively, the insulating layer 15 has a thickness H1, and H1 is set to 10 μm ≦ H1 ≦ 30 μm.

It can be understood that burrs are inevitably generated on the current collector when the positive and negative electrode sheets 10 and 20 are cut. By setting the thickness of the insulating layer 15 to at least more than 10 μm, it is possible to achieve a preferable effect of reducing burrs and avoiding risks due to the burrs. By limiting the thickness of the insulating layer 15 to be not more than 30 μm, the insulating layer 15 is prevented from being too thick, so that the positive electrode tab 112 is facilitated to be bent, and the insulating layer 15 is prevented from occupying too much space, so that the energy density of the cell structure 100 is improved.

In some specific embodiments, the insulating layer 15 is disposed on the positive electrode tab 112, a dimension L2 of the insulating layer 15 in the Z direction satisfies 0.3mm or more and L2 or less and 2.0mm or less, and a thickness H1 of the insulating layer 15 satisfies 10 μm or more and H1 or less and 30 μm or less, so that not only is the safety of the use of the electrical core structure 100 ensured, but also the energy density of the electrical core structure 100 is improved.

In the scheme of the application, the shape of the positive electrode tab 112 and the negative electrode tab 217 can be rectangular, the shape is simple, and materials are saved.

Of course, the shapes of the positive electrode tab 112 and the negative electrode tab 217 in the present application may also be not limited thereto, for example, as shown in fig. 3a and 3b, at least one of the positive electrode tab 112 and the negative electrode tab 217 is an isosceles trapezoid.

When the positive electrode tab 112 is in an isosceles trapezoid shape, the side of the positive electrode tab 112 connected to the positive electrode current collector main body 111 is a lower bottom, the side of the positive electrode tab 112 far away from the positive electrode current collector main body 111 is an upper bottom, and the lower bottom is longer than the upper bottom. The waist length of the positive electrode tab 112 is not limited and is generally influenced by the installation conditions.

Set up positive pole utmost point ear 112 like this, positive pole utmost point ear 112 is wideer with anodal mass flow body part 111 junction, is favorable to the electric current to be passed through by flowing between narrower negative pole utmost point ear 217 and the negative mass flow body part 216 of broad, and this junction broad is favorable to improving junction structural strength moreover, reduces here negative pole utmost point ear 217 fracture risk.

Alternatively, when the positive electrode tab 112 is an isosceles trapezoid, the base angle of the positive electrode tab 112 is 70 ° to 90 °, for example, the base angle of the positive electrode tab 112 is 71 °, 75 °, 78 °, 82 °, 86 °, 89 °, and the like. It will be appreciated that the positive tab 112 is longer in the Z direction to facilitate connection to an external connector. Therefore, the base angle of the positive electrode tab 112 should not be too small, and the excessive occupation of space caused by the too wide positive electrode tab 112 is avoided.

When the negative electrode tab 217 is in an isosceles trapezoid shape, the side of the negative electrode tab 217 connected to the negative electrode current collector main body portion 216 is a lower bottom, the side of the negative electrode tab 217 far away from the negative electrode current collector main body portion 216 is an upper bottom, and the lower bottom is longer than the upper bottom. The waist length of the negative electrode tab 217 is not limited and is generally affected by the mounting conditions.

Set up negative pole utmost point ear 217 so, negative pole utmost point ear 217 is wider with negative current collector main part 216 junction, is favorable to the electric current to be passed through by flowing between the negative current collector main part 216 of narrower negative pole utmost point ear 217 and broad, and this junction broad is favorable to improving junction structural strength moreover, reduces the here negative pole utmost point ear 217 fracture risk.

Alternatively, when the negative electrode tab 217 is an isosceles trapezoid, the base angle of the negative electrode tab 217 is 70 ° to 90 °, for example, the base angle of the negative electrode tab 217 is 71 °, 75 °, 78 °, 82 °, 86 °, 89 °, and the like. It can be appreciated that the negative tab 217 is longer in length in the Z direction to facilitate connection to external connections. Therefore, the bottom angle of the negative electrode tab 217 is not suitable to be too small, and excessive space occupation caused by too wide negative electrode tab 217 is avoided.

Of course, the present disclosure is not limited thereto, and in other embodiments, at least one of the positive electrode tab 112 and the negative electrode tab 217 may have an arc shape, an L shape, or the like.

In some embodiments, the cell structure 100 satisfies at least one of the following conditions:

in one case, as shown in fig. 4a, a junction between the positive electrode tab 112 and the positive electrode collector main body 111 is chamfered. In addition, the arrangement of the chamfer is beneficial to reducing the probability that the positive electrode tab 112 is turned over and torn along the joint, so that the probability that the positive electrode tab 112 is turned over and is turned into the battery cell structure 100 to cause short circuit is reduced.

Optionally, the chamfer is a round chamfer, and further optionally, the radius R1 of the round chamfer at the connection part of the positive electrode tab 112 and the positive electrode current collector main body part 111 is 0.5mm ≦ R1 ≦ 1.5mm.

In the second case, as shown in fig. 4b, a junction between the negative electrode tab 217 and the negative electrode collector main body portion 216 is chamfered. In addition, the arrangement of the chamfer is beneficial to reducing the probability that the negative electrode tab 217 is turned over and torn along the joint, thereby reducing the probability that the negative electrode tab 217 is turned over and is folded into the battery cell structure 100 to cause short circuit.

Optionally, the chamfer is a round chamfer, and further optionally, the radius R2 of the round chamfer at the connection part of the negative electrode tab 217 and the negative electrode current collector main body part 216 is 0.5mm ≦ R2 ≦ 1.5mm.

In case three, as shown in fig. 5a, the end of the positive electrode tab 112 away from the positive electrode collector main body 111 is chamfered. The chamfer is also beneficial to reducing the possibility of the positive pole lug 112 being folded. Optionally, the chamfer is a round chamfer, and further optionally, the radius R3 of the round chamfer of the end part of the positive electrode tab 112 far away from the positive electrode current collector main body part 111 is 0.5mm ≦ R3 ≦ 1.5mm.

In case four, as shown in fig. 5b, the end of the negative electrode tab 217 remote from the negative electrode collector main body portion 216 is provided with a chamfer. The chamfer is also beneficial to reducing the probability of the negative pole tab 217 turning over. Optionally, the chamfer is a round chamfer, and further optionally, the radius R4 of the round chamfer of the end part of the negative electrode tab 217 far away from the negative electrode current collector main body part 216 is 0.5mm ≦ R3 ≦ 1.5mm.

There are embodiments that satisfy only one or two of the four situations described above, and there are embodiments that satisfy three or four of the four situations described above, without limitation.

For example, in one embodiment, as shown in fig. 6a, the junction of the positive electrode tab 112 and the positive electrode collector main body 111 is provided with a chamfer, and the end of the positive electrode tab 112 away from the positive electrode collector main body 111 is also provided with a chamfer. As shown in fig. 6b, a junction between the negative electrode tab 217 and the negative electrode collector main body portion 216 is chamfered, and an end of the negative electrode tab 217 away from the negative electrode collector main body portion 216 is also chamfered.

In some embodiments, one positive electrode tab 112 is disposed on the positive electrode plate 10, or as shown in fig. 7a, a plurality of positive electrode tabs 112 are disposed on the positive electrode plate 10. The negative electrode tab 217 is disposed on the negative electrode tab 20, or as shown in fig. 7b, a plurality of negative electrode tabs 217 are disposed on the negative electrode tab 20.

In some embodiments, the battery cell structure 100 is a laminated structure, and may also be a winding structure.

The laminated structure is that the positive pole pieces 10 and the negative pole pieces 20 are alternately stacked, and the positive pole pieces 10 and the negative pole pieces 20 are separated by the diaphragm 30. Usually, the positive electrode plate 10, the negative electrode plate 20, and the diaphragm 30 on the battery cell structure 100 are all straight, and the shape of the battery cell structure 100 is more consistent with the shape of each electrode plate. The winding structure is a structure in which the positive electrode sheet 10 and the negative electrode sheet 20 are alternately stacked and separated by the separator 30, and then continuously wound.

Specifically, when a plurality of positive electrode tabs 112 are disposed on the positive electrode plate 10 and a plurality of negative electrode tabs 217 are disposed on the negative electrode plate 20, the battery cell structure 100 is a laminated structure, and may also be a winding structure. When the battery cell structure 100 is a laminated structure, the positive electrode plate 10, the negative electrode plate 20, and the separator 30 may be folded in a zigzag shape after being laminated. When the battery cell structure 100 is a winding structure, the positive electrode plate 10, the negative electrode plate 20, and the separator 30 are folded in a spiral direction after being stacked.

By adopting the battery cell structure 100 of the scheme of the application, burrs can be effectively reduced, and the performance can be improved.

According to the embodiment of the present invention, the battery includes the battery cell structure 100 according to the above embodiment, and the battery cell structure 100 is described in the above embodiment, which is not described herein again. According to the utility model discloses battery, through setting up above-mentioned electric core structure 100, reduced the technology processing procedure degree of difficulty, reduced the thin district of cutting that first positive pole active substance layer 123 self produced and to electric core structure 100 performance influence, be favorable to improving the performance.

According to the utility model discloses electronic equipment, including the battery according to above-mentioned embodiment, the battery structure is as above-mentioned embodiment, and is no longer repeated here. According to the utility model discloses electronic equipment, through setting up above-mentioned battery, can utilize the electrical property of battery preferred, improve reliability and the persistence of power consumption.

Other structures, such as electrode plates, electrode tabs, and the like, and the operation principle, etc., of the battery according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present specification, references to the description of the terms "embodiment," "example," 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 invention. In this specification, the schematic representations of the terms used above do not necessarily 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. While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A pole piece is characterized by comprising a current collector and an active substance layer, wherein the current collector comprises a current collector main body part, the active substance layer is arranged on at least one side surface of the current collector, the active substance layer comprises a first active substance layer, and the first active substance layer is arranged on the current collector main body part;

the first active material layer has an average thickness h1, and the first active material layer has a thickness h2 at any position,

2. the pole piece of claim 1, wherein the current collector further comprises a tab extending from the main body portion of the current collector, the active material layer further comprises a second active material layer connected to the first active material layer and disposed on the tab, and the thickness of the second active material layer at any position is h3, wherein h3 is not less than h1 x 97%.

3. The pole piece of claim 2, further comprising an insulating layer disposed on the tab, the insulating layer being connected to an end of the second active material layer remote from the first active material layer.

4. The pole piece of claim 3, wherein the insulating layer satisfies at least one of the following parameter conditions:

the size of the insulating layer in the extension direction of the lug is L2, and L2 is more than or equal to 0.3mm and less than or equal to 2.0mm;

the thickness of the insulating layer is H1, and H1 is set to be more than or equal to 10 mu m and less than or equal to H1 and less than or equal to 30 mu m.

5. The pole piece of any one of claims 2 to 4, wherein the first active material layer and the second active material layer are active material coatings of the same material.

6. A cell structure, comprising: the separator comprises a positive pole piece, a negative pole piece and a diaphragm clamped between the positive pole piece and the negative pole piece; the positive pole piece is the pole piece according to any one of claims 1 to 5;

the current collector of the positive pole piece is a positive current collector, the active substance layer of the positive pole piece is a positive active substance layer, the positive current collector comprises a positive current collector main body part and a positive pole lug, the positive active substance layer comprises a first positive active substance layer and a second positive active substance layer, the first positive active substance layer is arranged on the positive current collector main body part, and the second positive active substance layer is arranged on the positive pole lug;

the negative pole piece includes negative pole mass flow body and negative pole active material layer, the negative pole mass flow body includes negative pole mass flow body main part and follows the negative pole utmost point ear that the negative pole mass flow body main part extends, the negative pole active material layer is established on the at least side surface of the negative pole mass flow body, the negative pole active material layer includes first negative pole active material layer and second negative pole active material layer, first negative pole active material layer is established on the negative pole mass flow body main part, the second negative pole active material layer with first negative pole active material layer links to each other and establishes on the negative pole utmost point ear.

7. The cell structure of claim 6, wherein the positive electrode tab and the negative electrode tab are located on the same side of the cell structure, and the first negative electrode active material layer is located near an end of the second negative electrode active material layer and extends beyond an end of the second positive electrode active material layer away from the first positive electrode active material layer.

8. The cell structure of claim 7, wherein when the positive electrode tab further includes an insulating layer, the insulating layer is disposed on the positive electrode tab, and the insulating layer is connected to an end of the second positive electrode active material layer away from the first positive electrode active material layer;

an end of the insulating layer, which is away from the second positive electrode active material layer, protrudes beyond an end of the second negative electrode active material layer, which is away from the first negative electrode active material layer.

9. The cell structure of claim 6, wherein the cell structure satisfies at least one of the following parameter conditions:

the size of the second positive electrode active material layer in the extension direction of the positive electrode lug is L1, and L1 is more than 0 and less than or equal to 1.0mm;

the size of the second negative electrode active material layer in the extending direction of the negative electrode lug is L3, and the L3 is more than or equal to 0mm and less than or equal to 1.5mm.

10. A battery comprising a cell structure according to any of claims 6-9.

11. An electronic device characterized by comprising the battery according to claim 10.

Images