CN113991189A - Battery and electronic equipment - Google Patents
Battery and electronic equipment Download PDFInfo
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- CN113991189A CN113991189A CN202111411975.XA CN202111411975A CN113991189A CN 113991189 A CN113991189 A CN 113991189A CN 202111411975 A CN202111411975 A CN 202111411975A CN 113991189 A CN113991189 A CN 113991189A
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- positive smear
- holes
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 25
- 239000006258 conductive agent Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 36
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 36
- 238000001556 precipitation Methods 0.000 abstract description 7
- 239000011149 active material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000015110 jellies Nutrition 0.000 description 4
- 239000008274 jelly Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention provides a battery comprising: the positive plate and the negative plate are wound to form a roll core structure, wherein the positive plate comprises a current collector, a first positive smear, a second positive smear, a third positive smear and a fourth positive smear, the first positive smear is adjacent to the third positive smear, and the first positive smear and the third positive smear are coated on the first surface of the current collector; the second positive smear and the fourth positive smear are adjacent and coated on the second surface of the current collector, and the first surface of the current collector and the second surface of the current collector are opposite; the first positive smear corresponds to the second positive smear; the first positive smear and the second positive smear are provided with a plurality of holes. According to the embodiment of the invention, the content of the active material of the positive electrode is reduced by arranging the plurality of holes, so that the capacity ratio of the anode to the cathode is improved, and the risk of lithium precipitation of the lithium ion battery is reduced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery and electronic equipment.
Background
With the development of mainstream electronic products, people have higher requirements on the energy density of the lithium ion battery. At present, the lithium ion battery with higher energy density is mainly manufactured by a pole piece with large area density and large compaction. However, in the prior art, the lithium ion battery manufactured by using the pole piece with large areal density and large compaction has small liquid retention amount, and the situation of insufficient electrolyte or local deficiency is easy to occur, so that the lithium ion battery has serious lithium separation.
Therefore, the problem of serious lithium separation of the lithium ion battery exists in the prior art.
Disclosure of Invention
The embodiment of the invention provides a battery and electronic equipment, which are used for solving the problem that lithium separation of a lithium ion battery is serious in the prior art.
To achieve the above object, an embodiment of the present invention provides a battery, including: the positive plate and the negative plate are wound to form a roll core structure, wherein the positive plate comprises a current collector, a first positive smear, a second positive smear, a third positive smear and a fourth positive smear,
the first positive smear and the third positive smear are adjacent and coated on the first surface of the current collector;
the second positive smear and the fourth positive smear are adjacent and coated on the second surface of the current collector, and the first surface of the current collector and the second surface of the current collector are opposite;
the first positive smear corresponds to the second positive smear;
the first positive smear and the second positive smear are provided with a plurality of holes.
As an alternative embodiment, the first positive smear and the second positive smear are located at the beginning section of the central position in the winding core structure, and the first edge of the first positive smear and the first edge of the second positive smear are the beginning edges of the beginning section;
the number of holes in a first edge of the first positive smear is no more than the number of holes in a second edge of the first positive smear, the first edge of the first positive smear is opposite to the second edge;
the number of the holes in the first edge fixed distance of the second positive smear is not more than the number of the holes in the second edge fixed distance of the second positive smear, and the first edge of the second positive smear is opposite to the second edge.
As an alternative embodiment, the number of the holes of the first positive smear is 10-1000, and the number of the holes of the second positive smear is 10-1000.
As an alternative embodiment, the holes of the first positive smear and the holes of the second positive smear are circular;
the diameter of the hole within a first edge fixed distance of the first positive smear is not greater than the diameter of the hole within a second edge fixed distance of the first positive smear;
the diameter of the hole in the first edge fixed distance of the second positive smear is not greater than the diameter of the hole in the second edge fixed distance of the second positive smear.
In an alternative embodiment, the diameter of the holes of the first positive smear is between 10 μm and 1000 μm and the diameter of the holes of the second positive smear is between 10 μm and 1000 μm.
As an alternative embodiment, the outer side surface of the jelly roll structure is the current collector;
the size of the third positive electrode smear is matched with that of the current collector of the roll core structure;
the second edge of the fourth positive smear and the second edge of the third positive smear are located at corresponding positions of the winding core structure adjacent to the current collector, the first edge and the second edge of the third positive smear are opposite, and the first edge and the second edge of the fourth positive smear are opposite;
the size of the fourth positive smear is matched with that of the third positive smear.
As an optional embodiment, the positive plate of the lithium ion battery further comprises a tab, and the tab is located near one side of the first positive plate smear, which is far away from the current collector;
and the lug is fixedly welded with the first positive electrode smear.
As an alternative embodiment, the first positive electrode smear and the second positive electrode smear are made by mixing lithium cobaltate, a conductive agent and a binder according to a certain proportion;
the conductive agent is prepared by mixing the carbon black and the conductive carbon tube according to a certain proportion.
The embodiment of the invention also provides electronic equipment comprising the battery.
One of the above technical solutions has the following advantages or beneficial effects:
in the embodiment of the invention, the first positive smear and the second positive smear are provided with the plurality of holes, and the holes can store a certain amount of electrolyte, so that the content of positive active substances at the position can be reduced, the ratio of the anode capacity to the cathode capacity at the position is improved, the lithium precipitation risk at the position is reduced, and the liquid retention capacity of the lithium ion battery can be increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic plane structure diagram of a positive plate of a lithium ion battery provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hole structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a winding core structure of a positive plate of a lithium ion battery provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic plan view of a positive plate of a lithium ion battery according to an embodiment of the present invention, where the battery includes: the positive plate and the negative plate are wound to form a roll core structure, wherein the positive plate comprises a current collector 10, a first positive smear 21, a second positive smear 22, a third positive smear 23 and a fourth positive smear 24,
the first positive smear 21 and the third positive smear 23 are adjacent, and the first positive smear 21 and the third positive smear 23 are coated on the first surface of the current collector 10;
the second positive smear 22 is adjacent to the fourth positive smear 24, the second positive smear 22 and the fourth positive smear 24 are coated on the second surface of the current collector 10, and the first surface of the current collector 10 is opposite to the second surface of the current collector 10;
the first positive smear corresponds to the second positive smear;
the first positive smear and the second positive smear are provided with a plurality of holes.
In this embodiment, the holes 201 are formed in the first positive electrode smear 21 and the second positive electrode smear 22 to absorb the electrolyte, so as to increase the battery capacity, and simultaneously reduce the content of the positive active material at the position, thereby increasing the ratio of the anode capacity to the cathode capacity of the battery at the position, and reducing the risk of lithium deposition at the position.
Referring to fig. 2, fig. 2 is a schematic diagram of a structure of the holes 201 according to an embodiment of the present invention, showing the distribution of the holes 201 of the first positive smear 21 and the second positive smear 22. The holes 201 are formed by physically punching the first positive electrode smear 21 and the second positive electrode smear 22 while the positive electrode smear is coated on the current collector 10.
The positions of the single-piece area of the lithium ion battery negative plate and the first positive smear 21 and the second positive smear 22 of the lithium ion battery positive plate correspond to each other, so that the lithium separation problem of the single-piece area of the lithium ion battery negative plate is improved through the holes 201 of the first positive smear 21 and the second positive smear 22.
As an alternative embodiment, the first positive smear 21 and the second positive smear 22 are located at the beginning section of the central position in the winding core structure, and the first edge of the first positive smear 21 and the first edge of the second positive smear 22 are the beginning edges of the beginning section;
the number of the holes 201 in the first edge fixed distance of the first positive smear 21 is not more than the number of the holes 201 in the second edge fixed distance of the first positive smear 21, and the first edge of the first positive smear 21 is opposite to the second edge;
the number of holes 201 in the first edge of the second positive smear 22 is no more than the number of holes 201 in the second edge of the second positive smear 22, and the first edge of the second positive smear 22 is opposite to the second edge.
In this embodiment, since the holes 201 store a certain amount of electrolyte, the excessive number of the holes 201 may result in a lower battery capacity and a loss of battery energy density; and too low a number of holes 201 may result in less effective lithium deposition. The number of the holes 201 in the first edge fixed distance of the first positive electrode smear 21 is not more than the number of the holes 201 in the second edge fixed distance of the first positive electrode smear 21, and through the differentiated number design, the energy density can be maintained at a higher level under the condition of effectively improving the problem of lithium analysis of the battery.
Similarly, the number of the holes 201 in the first fixed distance of the second positive smear 22 is not more than the number of the holes 201 in the second fixed distance of the second positive smear 22, so as to achieve the same effect as the first positive smear 21, and the detailed description is omitted here.
As an alternative embodiment, the number of holes of the first positive smear is 10-1000, and the number of holes of the second positive smear is 10-1000.
In this embodiment, the number of the holes 201 in the first positive electrode smear 21 and the second positive electrode smear 22 is set to 10 to 1000, which allows the energy density to be maintained at a high level while effectively improving the problem of lithium deposition in the battery.
As an alternative embodiment, the holes 201 of the first positive smear 21 and the holes 201 of the second positive smear 22 are circular;
the diameter of the hole 201 in the first fixed distance of the first positive smear 21 is not greater than the diameter of the hole 201 in the second fixed distance of the first positive smear 21;
the diameter of the holes 201 in the first fixed distance of the second positive smear 22 is not larger than the diameter of the holes 201 in the second fixed distance of the second positive smear 22.
In this embodiment, since the hole 201 stores the electrolyte, too large diameter of the hole 201 causes a problem of low battery capacity, resulting in loss of energy density of the battery; and the diameter of the hole 201 is too small, so that the problem of lithium precipitation of the battery cannot be effectively improved. The diameter of the hole 201 in the first edge fixed distance of the first positive electrode smear 21 is not larger than the diameter of the hole 201 in the second edge fixed distance of the first positive electrode smear 21, and through differentiation design, energy density is guaranteed to be considered under the condition of effectively reducing lithium deposition of the battery.
Similarly, the diameter of the hole 201 in the first fixed distance of the second positive smear 22 is not greater than the diameter of the hole 201 in the second fixed distance of the second positive smear 22, which can achieve the same effect as the first positive smear 21, and is not repeated herein.
In an alternative embodiment, the first positive smear has a pore diameter of 10 μm to 1000 μm and the second positive smear has a pore diameter of 10 μm to 1000 μm.
In this embodiment, the diameters of the holes 201 of the first positive electrode smear 21 and the second positive electrode smear 22 are distributed between 10um and 1000um, so that the energy density can be maintained at a high level while effectively improving the problem of lithium deposition of the battery.
In order to better consider the energy density and the lithium precipitation effect, the embodiment of the invention carries out experimental tests in the following way:
preparing a lithium ion battery positive plate:
comparative example 1, a lithium ion battery positive plate without a hole 201 is prepared;
embodiment 1, preparing a lithium ion battery positive plate with holes 201, wherein the number of the holes 201 of the first positive smear 21 and the first positive smear 21 is 10, and the diameter of the holes 201 is 10 um;
embodiment 2, preparing a lithium ion battery positive plate with holes 201, wherein the number of the holes 201 of the first positive smear 21 and the first positive smear 21 is 10, and the diameter of the holes 201 is 1000 um;
embodiment 3, preparing a lithium ion battery positive plate with holes 201, wherein the number of the holes 201 of the first positive smear 21 and the first positive smear 21 is 1000, and the diameter of the holes 201 is 10 um;
embodiment 4, preparing a lithium ion battery positive plate with holes 201, wherein the number of the holes 201 of the first positive smear 21 and the first positive smear 21 is 1000, and the diameter of the holes 201 is 1000 um;
the area from the second side to the middle position of the first positive electrode smear 21 and the area from the second side to the middle position of the second positive electrode smear 22 are referred to as a head, and the area from the first side to the middle position of the first positive electrode smear 21 and the area from the first side to the middle position of the second positive electrode smear 22 are referred to as a tail.
Preparing a lithium ion battery positive plate with differentiated head and tail parts:
embodiment 5, a lithium ion battery positive plate with holes 201 is prepared, wherein the number of the holes 201 at the head is set to 700, the number of the holes 201 at the tail is set to 300, and the diameters of the holes 201 are all 1000 um;
embodiment 6, prepare the positive plate of lithium ion battery with perforation 201, wherein, the number of the perforation 201 of head and tail is set to 500, and the diameter of the perforation 201 is 1000 um.
Winding the lithium ion battery positive plate and the lithium ion battery negative plate prepared by the different embodiments to prepare different lithium ion batteries, and performing the following performance tests on the prepared lithium ion batteries:
and (3) energy density testing: the lithium ion batteries of examples and comparative examples were measured at 25 ℃ using a charge-discharge regime of 0.2C charge, 0.5C discharge, 0.025C cut-off; the platform voltage of the lithium ion battery is the platform voltage under 0.2C multiplying power discharge;
cycle capacity retention and cycle expansion at 25 ℃: the lithium ion batteries of examples and comparative examples were cycled at 25 ℃ for 500T in a cycling regime of 2C charge, 0.5C discharge, 0.025C cut-off;
and (3) lithium analysis condition characterization: taking a battery with corresponding number of circles in a circulating manner, disassembling the battery after full charge, observing the lithium precipitation condition of the single side of the negative plate, and shooting the lithium precipitation condition by using a digital camera;
residual liquid amount: the residual liquid amount is calculated by subtracting the weight of the packaged battery from the weight of the two-sealed battery.
Wherein, the performance test results are as follows:
the above test results show that:
according to the embodiment 1, the embodiment 2, the embodiment 3 and the embodiment 4, the lithium precipitation condition can be improved by arranging different numbers or different diameters of holes 201 on the first positive smear 21 and the second positive smear 22;
it can be known from the embodiments 5 and 6 that the energy density of the battery can be effectively improved by the differentiated arrangement of the holes 201, and the cycle performance of the battery can be improved.
As an alternative embodiment, the outer surface of the jelly roll structure is a current collector 10;
the size of the third positive electrode smear 23 is matched with that of the current collector 10 of the roll core structure;
the second edge of the fourth positive smear 24 and the second edge of the third positive smear 23 are located at the corresponding positions of the adjacent current collectors 10 of the core structure, the first edge and the second edge of the third positive smear 23 are opposite, and the first edge and the second edge of the fourth positive smear 24 are opposite;
the size of the fourth positive smear 24 is adapted to the size of the third positive smear 23.
In this embodiment, since the positive plate of the lithium ion battery is designed to be a roll core structure, the size of the positive plate of the lithium ion battery is matched with the size of the negative plate of the lithium ion battery, so that the requirement of the lithium ion battery can be met. Since the outermost side is one side of the current collector 10, the sum of the sizes of the third positive electrode smear 23 and the first positive electrode smear 21 needs to be different from the size of the current collector 10 by the size of at least one outermost side of the jelly roll structure.
In addition, for the fourth positive electrode smear 24, since the position of the fourth positive electrode smear 24 needs to correspond to the position of the third positive electrode smear 23, the size of the third positive electrode smear 23 and the size of the fourth positive electrode smear 24 in the jelly roll structure are different by about the size of one winding layer.
As an optional embodiment, the positive plate of the lithium ion battery further includes a tab 30, and the tab 30 is located near the side of the first positive plate 21 away from the current collector 10;
the tab 30 is welded and fixed with the first positive electrode smear 21.
In the embodiment, a tab 30 is welded on the first positive electrode smear 21 to reduce the area of the empty foil area and improve the energy density; meanwhile, the impedance of the battery cell can be reduced, and the charging speed of the battery cell is improved.
As an alternative embodiment, the first positive electrode smear 21 and the second positive electrode smear 22 are made by mixing lithium cobaltate, conductive agent and adhesive according to a certain proportion;
the conductive agent is prepared by mixing the carbon black and the conductive carbon tube according to a certain proportion.
In this embodiment, lithium source is provided by lithium cobaltate, and slurry is prepared by the lithium cobaltate, conductive agent and adhesive for preparing the first positive electrode smear 21 and the second positive electrode smear 22, so that the lithium cobaltate has better conductive and energy storage performances.
The embodiment of the application also provides electronic equipment comprising the battery.
It should be noted that the implementation manner of the above battery embodiment is also applicable to the embodiment of the electronic device, and can achieve the same technical effect, and details are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A battery, comprising: the positive plate and the negative plate are wound to form a roll core structure, wherein the positive plate comprises a current collector, a first positive smear, a second positive smear, a third positive smear and a fourth positive smear,
the first positive smear and the third positive smear are adjacent and coated on the first surface of the current collector;
the second positive smear and the fourth positive smear are adjacent and coated on the second surface of the current collector, and the first surface of the current collector and the second surface of the current collector are opposite;
the first positive smear corresponds to the second positive smear;
the first positive smear and the second positive smear are provided with a plurality of holes.
2. The battery of claim 1 wherein the first positive smear and the second positive smear are located at a beginning section of a central location within the jellyroll structure, and the first edge of the first positive smear and the first edge of the second positive smear are the beginning edges of the beginning section;
the number of holes in a first edge of the first positive smear is no more than the number of holes in a second edge of the first positive smear, the first edge of the first positive smear is opposite to the second edge;
the number of the holes in the first edge fixed distance of the second positive smear is not more than the number of the holes in the second edge fixed distance of the second positive smear, and the first edge of the second positive smear is opposite to the second edge.
3. The battery of claim 2 wherein the number of holes of the first positive smear is 10-1000 and the number of holes of the second positive smear is 10-1000.
4. The battery of claim 2 wherein the holes of the first positive smear and the holes of the second positive smear are circular;
the diameter of the hole within a first edge fixed distance of the first positive smear is not greater than the diameter of the hole within a second edge fixed distance of the first positive smear;
the diameter of the hole in the first edge fixed distance of the second positive smear is not greater than the diameter of the hole in the second edge fixed distance of the second positive smear.
5. The battery of claim 4 wherein the hole diameter of the first positive smear is 10-1000 μ ι η and the hole diameter of the second positive smear is 10-1000 μ ι η.
6. The battery of claim 1, wherein the outer surface of the jellyroll structure is the current collector;
the size of the third positive electrode smear is matched with that of the current collector of the roll core structure;
the second edge of the fourth positive smear and the second edge of the third positive smear are located at corresponding positions of the winding core structure adjacent to the current collector, the first edge and the second edge of the third positive smear are opposite, and the first edge and the second edge of the fourth positive smear are opposite;
the size of the fourth positive smear is matched with that of the third positive smear.
7. The battery of claim 2 further comprising a tab located proximate a side of the first positive smear distal from the current collector;
and the lug is fixedly welded with the first positive electrode smear.
8. The battery of claim 1, wherein the first positive electrode smear and the second positive electrode smear are made by mixing lithium cobaltate, conductive agent and adhesive according to a certain proportion;
the conductive agent is prepared by mixing the carbon black and the conductive carbon tube according to a certain proportion.
9. An electronic device characterized in that the electronic device comprises the battery of claim 8.
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| CN202111411975.XA CN113991189B (en) | 2021-11-25 | 2021-11-25 | Battery and electronic equipment |
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| CN202111411975.XA CN113991189B (en) | 2021-11-25 | 2021-11-25 | Battery and electronic equipment |
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