CN117577960A - Electrode assembly, battery and electric equipment - Google Patents
Electrode assembly, battery and electric equipment Download PDFInfo
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- CN117577960A CN117577960A CN202410038661.7A CN202410038661A CN117577960A CN 117577960 A CN117577960 A CN 117577960A CN 202410038661 A CN202410038661 A CN 202410038661A CN 117577960 A CN117577960 A CN 117577960A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 66
- 239000000853 adhesive Substances 0.000 claims description 112
- 230000001070 adhesive effect Effects 0.000 claims description 111
- 239000003292 glue Substances 0.000 claims description 41
- 238000004804 winding Methods 0.000 claims description 25
- 230000004888 barrier function Effects 0.000 claims 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 63
- 229910052744 lithium Inorganic materials 0.000 abstract description 63
- 238000001556 precipitation Methods 0.000 abstract description 48
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 150000002500 ions Chemical class 0.000 description 91
- 238000009830 intercalation Methods 0.000 description 18
- 230000002687 intercalation Effects 0.000 description 17
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 238000000605 extraction Methods 0.000 description 8
- 238000009831 deintercalation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000037427 ion transport Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002134 carbon nanofiber Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000002048 multi walled nanotube Substances 0.000 description 1
- 229910021392 nanocarbon Inorganic materials 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
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- 238000006722 reduction reaction Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an electrode assembly, a battery and electric equipment, and relates to the technical field of battery manufacturing. The auxiliary component of the electrode component is arranged in the cathode-anode structure and is used for enabling the ion transmission rate of the anode corner part in the same cathode-anode structure to be larger than that of the adjacent cathode corner part; according to the invention, the auxiliary component is additionally arranged to enable the ion transmission rate of the anode corner part in the same cathode-anode-wrapping structure to be larger than that of the adjacent cathode corner part, so that the modification of the pole piece is reduced as much as possible under the condition of ensuring the original structure of the battery cell, the ion transmission efficiency of the anode corner part is improved by utilizing the auxiliary component, and therefore, the problem of corner lithium precipitation is improved under the influence of small modification, and the performance of the battery cell is greatly improved.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to an electrode assembly, a battery and electric equipment.
Background
When the battery is charged, li + (lithium ion)) De-intercalation from the cathode and intercalation into the anode; but when some anomalies are: such as insufficient lithium intercalation space of anode, li + Too great resistance to intercalation of Li + If abnormality such as too rapid extraction from the cathode but not equivalent insertion into the anode occurs, li cannot be inserted into the anode + Only the reduction reaction takes place at the anode surface, so that a silvery white metallic lithium simple substance is formed, which is known as lithium precipitation. The lithium precipitation not only reduces the battery performance and shortens the cycle life greatly, but also limits the quick charge capacity of the battery, and can cause disastrous consequences such as combustion, explosion and the like. The power battery structure mainly comprises a square aluminum shell, a cylinder and a soft package. The square aluminum shell battery shell is made of aluminum alloy, and a winding or lamination type process is adopted in the square aluminum shell battery shell.
However, since the CB value (battery balance) is less than 1 in the case of the wound cell at the corner of the battery, the wound cell is likely to undergo a lithium precipitation reaction at the corner. This can lead to electrical performance tripping of the cell and some safety issues.
Disclosure of Invention
The invention aims to provide an electrode assembly, a battery and electric equipment, wherein the ion transmission rate of an anode corner part in the same cathode-anode structure is larger than that of an adjacent cathode corner part by additionally arranging an auxiliary assembly, so that the improvement of a pole piece is reduced as much as possible under the condition of ensuring the original structure of a battery core, the ion transmission efficiency of the anode corner part is improved by utilizing the auxiliary assembly, the ion transmission efficiency of the cathode corner part is reduced, and the problem of corner lithium precipitation is improved under the influence of small change, and the performance of the battery core is greatly improved.
In order to achieve the above object, the present invention discloses an electrode assembly, which comprises an anode sheet, a separator, a cathode sheet and an auxiliary assembly, wherein the anode sheet, the cathode sheet and the separator are arranged in a winding structure along a winding direction, a plurality of corner regions are sequentially formed in the winding structure from outside to inside, a plurality of corner regions positioned in an inner layer of the winding structure form a cathode-anode wrapping structure, the auxiliary assembly is arranged in the same cathode-anode wrapping structure, and the auxiliary assembly is used for enabling the ion transmission rate of an anode corner part in the same cathode-anode wrapping structure to be greater than that of an adjacent cathode corner part.
Compared with the prior art, the auxiliary component is arranged in the cathode-anode structure, and is used for enabling the ion transmission rate of the anode corner part in the same cathode-anode structure to be larger than that of the adjacent cathode corner part, and the ion transmission rate of the anode corner part in the same cathode-anode structure is larger than that of the adjacent cathode corner part by additionally arranging the auxiliary component, so that the improvement of a pole piece is reduced as much as possible under the condition of ensuring the original structure of the battery cell, the ion transmission efficiency of the anode corner part is improved by utilizing the auxiliary component, the ion transmission efficiency of the cathode corner part is reduced, the problem of corner lithium precipitation is improved under the influence of small change, and the performance of the battery cell is greatly improved.
Preferably, the auxiliary component comprises conductive adhesive, and the conductive adhesive is arranged at the anode corner part, so that the ion transmission rate of the anode corner part in the same cathode-anode structure is higher than that of the cathode corner part. The conductive adhesive is adopted to provide a channel for ion transmission, reduce ion intercalation resistance and accelerate ion transmission, so that the anode ion transmission rate in the cathode-anode structure is larger than the cathode ion transmission rate, and ions separated from the cathode can be intercalated into the anode.
Further, in the same cathode-anode structure, the conductive paste is disposed on a surface of the anode corner portion near the cathode corner portion. In the same cathode-anode coating structure, the deintercalation of ions easily occurs on the surfaces close to each other, and the area of the cathode corner part close to each other is larger than that of the anode corner part, so that the conductive adhesive is arranged on one surface of the anode corner part close to the cathode corner part, the ion transmission rate of the anode corner part easy to separate out lithium is improved, and the risk of separating out lithium is greatly reduced.
Further, the auxiliary assembly further comprises adhesive glue, and the adhesive glue is arranged on one surface of the cathode corner part, which is close to and/or far from the anode corner part, in the same female-male structure. And by adopting the adhesive structure, the ion transmission of the corner part of the cathode is reduced, so that the ions at the corner part of the cathode are difficult to separate out, and the risk of lithium precipitation is reduced. The adhesive is arranged on one surface of the corner part of the cathode, which is close to the corner part of the anode, so that the cathode lithium removal in the same cathode-anode structure can be reduced, and the lithium precipitation risk in the same cathode-anode structure can be further reduced; the adhesive is arranged on one surface of the corner part of the cathode, which is far away from the corner part of the anode, so that the lithium removal of the cathode in the adjacent cathode-anode structure can be reduced, and the lithium precipitation risk in the adjacent cathode-anode structure can be further reduced.
Preferably, the auxiliary component comprises adhesive glue, and the adhesive glue is arranged at the corner part of the cathode, so that the ion transmission rate of the corner part of the cathode in the same cathode-anode structure is smaller than that of the corner part of the anode.
Further, in the same cathode-anode coating structure, the adhesive is disposed on a surface of the cathode corner portion, which is close to the anode corner portion. In the same cathode-anode coating structure, the deintercalation of ions easily occurs on the surfaces close to each other, and the area of the cathode corner part close to each other is larger than that of the anode corner part, so that the adhesive is arranged on one surface of the cathode corner part close to the anode corner part, the ion deintercalation of the cathode corner part is reduced, and the lithium precipitation risk is reduced.
Further, the auxiliary assembly further comprises conductive adhesive, and in the same cathode-anode structure, the conductive adhesive is arranged on one surface of the anode corner part, which is close to and/or far from the cathode corner part. In one cathode-anode structure, the conductive adhesive is arranged on one surface of the anode corner part close to the cathode corner part, so that the ion transport capacity of the anode corner part in the same cathode-anode structure can be increased, and the lithium precipitation risk in the same cathode-anode structure can be reduced; the conductive adhesive is arranged on one surface of the anode corner part far away from the cathode corner part, so that the ion transport capacity of the anode corner part in the adjacent cathode-anode structure can be increased, and the lithium precipitation risk in the bell cathode-anode structure can be reduced.
Preferably, the auxiliary component comprises conductive glue and/or adhesive glue, wherein the conductive glue is arranged on two sides of the anode corner part, and/or the adhesive glue is arranged on two sides of the cathode corner part. The conductive adhesive is arranged on two sides of the anode corner, so that the ion transmission rate of the anode corner in the same cathode Bao Yang structure and the adjacent cathode-anode structure can be enhanced simultaneously, and the lithium precipitation risk in the same and adjacent cathode-anode structures is reduced simultaneously; the adhesive glue is arranged on two sides of the cathode corner part, so that the ion transmission rate of the cathode corner part in the same cathode Bao Yang structure and the adjacent cathode-anode-cladding structure can be reduced simultaneously, and the lithium precipitation risk in the same cathode-anode-cladding structure and the adjacent cathode-anode-cladding structure can be reduced simultaneously.
Preferably, in the same female and male structure, both ends of the conductive adhesive in the winding direction do not exceed both ends of the adhesive in the winding direction. The area of the adhesive glue is larger than that of the conductive glue, so that the ion transmission rate of the anode corner part in the cathode-anode structure is larger than that of the cathode corner part, and the possibility of lithium precipitation is reduced.
Correspondingly, the invention also provides a battery comprising the electrode assembly.
Correspondingly, the invention also provides electric equipment comprising the battery.
Drawings
FIG. 1 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a cell structure according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a cell structure according to an embodiment of the present invention;
in the figure, a 1-anode corner, a 2-cathode straight part, a 3-cathode corner, 4-adhesive glue and 5-conductive glue; 10-anode pole piece, 20-isolating film and 30-cathode pole piece.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Referring to fig. 1 to 10, the battery/electric device of the present embodiment includes an electrode assembly including an anode electrode sheet 10, a separator 20, a cathode electrode sheet 30 and an auxiliary assembly, and the anode electrode sheet 10, the cathode electrode sheet 30 and the separator 20 are wound in a winding structure. It will be appreciated that in the winding structure of the present embodiment, the separator 20 is stacked between the adjacent anode and cathode sheets 10 and 30 to ensure that the adjacent anode and cathode sheets 10 and 30 are in an insulated state. In this embodiment, the pole pieces located at the outermost and innermost layers of the winding structure are anode pole pieces 10. The pole piece comprises a current collector and active substances arranged on two sides of the current collector, and the materials of the current collector and the active substances are different according to different battery systems. The battery in the present application may be a rocking chair type battery capable of ion extraction and intercalation, such as a lithium ion battery, a sodium ion battery, a magnesium ion battery, or a hybrid battery, and the present embodiment will be described by taking a lithium ion battery as an example.
The winding structure is sequentially provided with a plurality of corner areas from outside to inside, and each layer of the winding structure is similar to a round corner rectangle, namely, each layer of the winding structure is provided with two corner areas which are arranged in a mirror image mode.
In order to ensure that ions in the battery have enough embedding space, the pole piece of the innermost layer of the winding structure is the anode pole piece 10, a plurality of corner areas positioned in the inner layer of the winding structure form a cathode-anode wrapping structure, the cathode Bao Yang structure comprises a cathode corner part 3 positioned in an outer corner area and an anode corner part 1 positioned in the inner corner area, the radian of the cathode corner part 3 positioned in the outer corner area is larger than that of the anode corner part 1 positioned in the inner corner area, the anode pole piece 10 forms a corresponding anode corner part 1 at each corner area, and the cathode pole piece 30 forms a corresponding cathode corner part 3 at each corner area. It will be appreciated that the coiled structure of this embodiment has two female Bao Yang structures arranged in mirror image fashion, one at each interval, similar to each layer of the coiled structure.
When the battery is charged, lithium ions are extracted from a cathode and are intercalated into an anode, in the cathode-anode structure, the area of a cathode corner part 3 is larger than that of an anode corner part 1, the cathode corner part 3 is positioned on the outer layer of the anode corner part 1, the electrolyte infiltration degree is better, ions extracted from the cathode corner part 3 in the same cathode-anode structure are larger than those intercalated into the anode corner part 1, and ions which are not intercalated into the anode corner part 1 are precipitated on the surface of the anode, so that lithium precipitation is caused.
The auxiliary component is arranged in the same cathode-anode structure, and the auxiliary component is used for enabling the ion transmission rate of the anode corner part 1 in the same cathode-anode structure to be larger than that of the adjacent cathode corner part 3. The ion intercalation capacity of the anode corner 3 is larger than the ion deintercalation capacity of the cathode corner 1, so that the situation that excessive ions cannot be intercalated into the anode corner 3 and are precipitated in the anode corner 3 is avoided.
In a lithium ion battery, the charging process is an intercalation process of lithium ions in the anode material (e.g., graphite), and the discharging process is a deintercalation process of lithium ions from the anode material and chemical reactions occur in the cathode material (e.g., metal oxide). As the ion transport rate at the corner of the anode increases, more lithium ions can rapidly intercalate at the anode surface, forming lithium intercalation compounds, which will accelerate the charge rate and bring the battery to a certain state of charge in a shorter time. In addition, as the ion transport rate at the corner of the anode increases during discharge, the already intercalated lithium ions can be deintercalated from the anode material faster and migrate to the cathode material, which will increase the cell output power and discharge rate.
In this embodiment, the auxiliary component includes a conductive paste 5 disposed on the anode corner portion 1, so that the ion transmission rate of the anode corner portion 1 is greater than that of the cathode corner portion 3 in the same cathode-anode structure. The conductive adhesive can accelerate ion transmission, reduce ion intercalation resistance, improve lithium intercalation capacity of anode corner parts, and reduce the problem that ions cannot be timely intercalated into anode corner parts 3 due to the problems of fewer transmission channels, higher intercalation resistance and the like, so that lithium precipitation is caused.
Specifically, in the same cathode-anode structure, the conductive paste 5 is disposed at least on one side of the anode corner portion 1 near the cathode corner portion 3. In a cathode-anode structure, the ion transport capacity of the adjacent cathode corner 3 is greater than that of the anode corner 1, and the ion extraction and intercalation mostly occur between the adjacent cathode and anode, and the lithium precipitation phenomenon mostly occurs on the side of the cathode-anode structure close to the anode corner 1 and close to the cathode corner 3. Therefore, in a cathode-anode structure, the conductive adhesive 5 is arranged on one surface of the anode corner part 1, which is close to the cathode corner part 3, so that the ion transmission capability of the part which is most easy to separate lithium is enhanced, and the risk of separating lithium is greatly reduced.
Further, the auxiliary assembly of the present embodiment further includes an adhesive glue 4, where the adhesive glue 4 is disposed on the cathode corner portion 3, so that the ion transmission rate of the cathode corner portion 3 in the same cathode-anode structure is smaller than that of the anode corner portion 1. Ions are mainly extracted from the cathode corner 3, and lithium is not extracted due to the insertion. The adhesive is arranged at the cathode corner part 3, so that the ion extraction of the cathode corner part 3 is reduced, the number of ions which cannot be intercalated is also reduced, and the phenomenon of lithium precipitation is further reduced.
Specifically, in the same female-male structure, the adhesive 4 is provided on the side of the cathode corner portion 3 near the anode corner portion 1. In a cathode-anode coating structure, ion extraction and intercalation mostly occur between cathode and anode plates which are close to each other, an adhesive 4 is adopted to be arranged on one surface of a cathode corner part 3 close to an anode corner part 1, ion extraction of the cathode corner part 3 is reduced, the proportion of ions which can be intercalated into the anode corner part 1 is increased, and the occurrence probability of lithium precipitation is reduced.
Specifically, in the same female-male structure, the adhesive paste 4 is provided on the side of the cathode corner portion 3 near the anode corner portion 1, and the conductive paste 5 is provided on the side of the anode corner portion 1 near the cathode corner portion 3. Ion extraction and intercalation mostly occur on the surfaces of adjacent cathode and anode plates, and in the same cathode-anode structure, as the area of the cathode corner 3 is larger than that of the anode corner 1 and the infiltration degree is better, the number of ions extracted from the cathode corner 3 is more, and the number of ion intercalation of the anode corner 1 is less, so that lithium precipitation occurs in the anode corner 1. Therefore, in a cathode-anode structure, the adhesive glue 4 is arranged on the surface of the cathode corner part 3 close to the anode corner part 1, and the conductive glue 5 is arranged on the surface of the anode corner part 1 close to the cathode corner part 3, so that the lithium intercalation capacity of the anode corner part 1 on the adjacent surface can be increased, the lithium deintercalation capacity of the cathode corner part 3 can be reduced, and the occurrence of lithium precipitation can be reduced.
Alternatively, in a cathode-anode structure, the adhesive paste 4 is provided on a face of the cathode corner portion 3 close to the anode corner portion 1, and the conductive paste 5 is provided on a face of the anode corner portion 1 away from the cathode corner portion 3. The adhesive glue 4 is adopted to reduce the lithium removal of the cathode corner part 3 and reduce the lithium precipitation phenomenon in the same cathode-anode structure. Meanwhile, the cathode and anode plates between two adjacent cathode-coated anode structures are close to each other, so that ions are separated and intercalated, and the risk of lithium precipitation is also present. The anode corner 1 is close to one surface of the adjacent anode structure, namely one surface of the cathode corner 3 in the same cathode structure, and is provided with the conductive adhesive 5, so that ion transmission in the anode structure can be increased, and lithium precipitation phenomenon between the anode structure and the cathode structure can be avoided.
Alternatively, in the same cathode-anode structure, the anode corner portion 1 is provided with the conductive paste 5 on the side close to the cathode corner portion 3, and the cathode corner portion 3 is provided with the adhesive paste 4 on the side away from the anode corner portion 1. In the same cathode-anode coating structure, the conductive adhesive 5 is arranged on one surface of the anode corner part 1, which is close to the cathode corner part 3, so that the ion transmission capacity of the anode corner part 1 is increased, and the embedding quantity of ions in the anode corner part 1 is increased. Meanwhile, ions are separated and embedded in two adjacent cathode-anode-coated structures, and adhesive glue 2 is arranged on one surface of a cathode corner 3, which is close to the adjacent cathode-anode-coated structure, namely one surface of the anode corner 1, which is far away from the same cathode-anode-coated structure, so that the lithium removing capacity of the cathode corner 1 in the adjacent cathode-anode-coated structure is reduced, and further lithium precipitation in the adjacent cathode-anode-coated structure is reduced.
In this embodiment, by providing the auxiliary component, the ion transmission rate of the cathode corner portion 3 in the same cathode-anode structure is 1% to 70% of the ion transmission rate of the anode corner portion 1, so as to meet the requirement of balancing the battery electric quantity.
When the ion transmission rate of the anode corner part 1 is increased, the charge and discharge rate and the power density of the battery are improved, and meanwhile, the migration impedance between the anode and the cathode is reduced, so that the internal resistance of the battery can be reduced, and the energy loss of the battery in the use process is reduced; thus, the provision of the auxiliary assembly can improve the cycle life, enabling the battery to maintain stable performance over a longer period of time.
For the setting positions of the conductive adhesive 5 and the adhesive 4, ten setting schemes are given in this embodiment:
scheme one: in the same cathode-anode structure, the conductive paste 5 is provided on the side of the anode corner portion 1 near the cathode corner portion 3, as shown in fig. 1. By arranging the conductive adhesive on the anode corner 1, the ion transmission rate of the anode corner 1 in the same cathode-anode structure is ensured to be larger than that of the cathode corner 3, and the lithium precipitation phenomenon in the same cathode-anode structure is reduced.
Scheme II: in the same cathode-anode structure, the conductive paste 5 is provided on the side of the anode corner portion 1 close to the cathode corner portion 3 and the side away from the cathode corner portion 3. The conductive adhesive 5 is arranged on one surface of the anode corner 3 close to the cathode corner 3 in the same cathode-anode structure, so that the ion transmission rate of the anode corner 1 in the same cathode-anode structure can be improved, and the lithium precipitation phenomenon in the same cathode-anode structure can be reduced; the conductive adhesive 5 is arranged on one surface of the anode corner part 1 far away from the cathode corner part 3 in the same cathode-anode structure, so that the ion transmission rate of the anode corner part 1 in the adjacent cathode-anode structure can be improved, and the lithium precipitation phenomenon in the adjacent cathode-anode structure can be reduced.
Scheme III: in the same female-male structure, the adhesive 4 is provided on the side of the cathode corner portion 3 near the anode corner portion 1, as shown in fig. 3. By arranging the adhesive 4 at the cathode corner 3, the ion transmission rate of the cathode corner 3 in the same cathode-anode structure is ensured to be smaller than that of the anode corner 1, and the lithium precipitation phenomenon in the same cathode-anode structure is reduced.
Scheme IV: in the same female-male structure, the adhesive glue 4 is provided on the side of the cathode corner portion 3 close to the anode corner portion 1 and on the side remote from the anode corner portion 1, as shown in fig. 4. The adhesive glue 4 is arranged on one surface of the cathode corner part 3 close to the anode corner part 1 in the same cathode-anode structure, so that the ion transmission rate of the cathode corner part 3 in the same cathode-anode structure is reduced, and the lithium precipitation phenomenon in the same cathode-anode structure is reduced; the bonding adhesive is arranged on one surface of the cathode corner part 2 far away from the anode corner part 1 in the same cathode-anode structure, so that the ion transmission rate of the cathode corner part 3 in the adjacent cathode-anode structure is reduced, and the lithium precipitation phenomenon in the adjacent cathode-anode structure is reduced.
Scheme five: in the same cathode-anode structure, the conductive adhesive 5 is disposed on the surface of the anode corner portion 1 near the cathode corner portion 3, the adhesive 4 is disposed on the surface of the cathode corner portion 3 near the anode corner portion 1, that is, the conductive adhesive 5 and the adhesive 4 are disposed on the opposite surfaces of the anode corner portion 1 and the cathode corner portion 3, and at this time, the relative positional relationship between the conductive adhesive 5 and the adhesive 4 is as shown in fig. 5. By arranging the conductive adhesive 5 and the adhesive 4 in an opposite manner, the radian difference between the cathode corner 3 and the anode corner 1 can be balanced, which is favorable for more sufficient filling and infiltration of electrolyte, and the electrolyte is promoted to fully cover all electrode surfaces, thereby ensuring the effective working area of the electrode. More importantly, the ion transmission of the anode corner part 1 is improved, the ion transmission of the cathode corner part is reduced, ion extraction can be reduced, ion intercalation is improved, extracted ions can be intercalated, and the risk of lithium precipitation is greatly reduced.
In the sixth scheme, in a cathode-anode structure, the conductive adhesive 5 is disposed on one surface of the anode corner 1 close to the cathode corner 3 in the same cathode-anode structure, and the adhesive 4 is disposed on one surface of the cathode corner 3 away from the anode corner 1 in the same cathode-anode structure, and at this time, the relative positional relationship between the conductive adhesive 5 and the adhesive 4 is shown in fig. 4. The conductive adhesive 5 is arranged to enable the ion transmission capacity of the anode corner part 1 in the same cathode-anode structure to be larger than that of the cathode corner part 3, so that lithium precipitation in the same cathode-anode structure is reduced; meanwhile, the ion transmission capacity of the adhesive glue 4 at the cathode corner 3 is smaller than that of the anode corner 1 in the adjacent cathode-anode structure, so that lithium precipitation between the adjacent cathode-anode structure is avoided.
Scheme seven: in one cathode-anode structure, the conductive paste 5 is applied to one side of the anode corner portion 1 near the cathode corner portion 3 in the same cathode-anode structure, and the adhesive paste 4 is provided on both sides of the cathode corner portion 3 near and away from the anode corner portion 1 in the same cathode-anode structure, as shown in fig. 7. The conductive adhesive 5 is arranged on one surface of the anode corner part 1 close to the cathode corner part 3, so that the ion transmission capacity of the anode corner part 1 in the same cathode-anode structure is improved, and lithium precipitation in the same cathode-anode structure is reduced; the adhesive is arranged on one surface of the cathode corner part 3, which is close to the anode corner part 1, so that the ion transmission capacity of the cathode corner part 3 in the same cathode-anode structure is reduced, and the lithium precipitation phenomenon in the same cathode-anode structure is reduced.
Scheme eight: in a cathode-anode structure, the conductive adhesive 5 is disposed on a surface of the anode corner portion 1 away from the cathode corner portion 3 in the same cathode-anode structure, and the adhesive 4 is disposed on a surface of the cathode corner portion 3 close to the anode corner portion 1 in the same cathode-anode structure, and at this time, the relative positional relationship between the conductive adhesive 5 and the adhesive 4 is as shown in fig. 8. The adhesive glue 4 is arranged on the cathode corner part 3, so that the ion transmission capacity of the cathode corner part 3 in the same cathode-anode structure is smaller than that of the anode corner part 1, and the lithium precipitation phenomenon in the same cathode-anode structure is reduced; the conductive adhesive 5 is arranged at the anode corner part 1, so that the ion transmission capacity of the anode corner part 1 is larger than that of the cathode corner part 3 in the adjacent cathode-anode structure, and the lithium precipitation phenomenon in the adjacent cathode-anode structure is reduced.
Scheme nine: in a cathode-anode structure, conductive paste 5 is provided on both sides of the anode corner portion 1 near and far from the cathode corner portion 3, and adhesive paste 4 is provided on one side of the cathode corner portion 3 near the anode corner portion, as shown in fig. 9. The conductive adhesive 5 is arranged on one surface of the anode corner 1 close to the cathode corner 3 in the same cathode-anode structure, so that the ion transmission capacity of the anode corner 1 in the same cathode-anode structure is improved, and lithium precipitation in the same cathode-anode structure is reduced; the conductive adhesive 5 is arranged on one surface of the anode corner 1 far away from the cathode corner 3 in the same cathode-anode structure, so that the ion transmission capacity of the anode corner 1 in the adjacent cathode-anode structure is improved, and the lithium precipitation phenomenon in the adjacent cathode-anode structure is reduced; the adhesive glue 4 is arranged on one surface of the cathode corner part 3, which is close to the anode corner part 1 in the same cathode-anode structure, so that the ion transmission capacity of the cathode corner part 3 in the same cathode-anode structure is reduced, and lithium precipitation in the same cathode-anode structure is reduced.
Scheme ten: in a cathode-anode structure, the conductive paste 5 is provided on both sides of the anode corner portion 1 near and far from the cathode corner portion 3, and the adhesive paste 4 is provided on both sides of the cathode corner portion 3 near and far from the anode corner portion 1, as shown in fig. 10. The conductive adhesive 5 is arranged on one surface of the anode corner 1 close to the cathode corner 3 in the same cathode-anode structure, so that the ion transmission capacity of the anode corner 1 in the same cathode-anode structure is improved, and lithium precipitation in the same cathode-anode structure is reduced; the conductive adhesive 5 is arranged on one surface of the anode corner 1 far away from the cathode corner 3 in the same cathode-anode structure, so that the ion transmission capacity of the anode corner 1 in the adjacent cathode-anode structure is improved, and the lithium precipitation phenomenon in the adjacent cathode-anode structure is reduced; the adhesive glue 4 is arranged on one surface of the cathode corner part 3 close to the anode corner part 1 in the same cathode-anode structure, so that the ion transmission capacity of the cathode corner part 3 in the same cathode-anode structure is reduced, and lithium precipitation in the same cathode-anode structure is reduced; the adhesive glue 4 is arranged on one surface of the cathode corner part 3 far away from the anode corner part 1 in the same cathode-anode structure, so that the ion transmission capacity of the cathode corner part 1 in the adjacent cathode-anode structure is reduced, and the lithium precipitation in the adjacent cathode-anode structure is reduced.
It should be noted that the above ten schemes can be implemented in a combined way, the winding core is provided with a plurality of female and male structures from inside to outside, each layer is provided with two female and male structures, and the plurality of female and male structures can adopt the same or different schemes to set auxiliary components, so that occurrence of lithium precipitation is reduced.
Preferably, the adhesive 4 of the present embodiment is made of one or more of carboxymethyl cellulose, polyacrylic acid, polyvinyl alcohol, polyvinylidene fluoride or tetrafluoroethylene. The experiment shows that the best parameter performance can be obtained when the resistance of the adhesive glue 4 is limited to 0.1 omega-10 omega and the coating thickness of the adhesive glue 4 is limited to 10 mu m-100 mu m. The adhesive glue 4 may be of the type insulating glue or insulating tape.
Preferably, the material of the conductive paste 5 in this embodiment is one or more of carbon nanotubes, conductive carbon black, conductive graphite, graphene or carbon nanofibers.
Preferably, the invention provides a specific embodiment, the material of the conductive adhesive 5 of the embodiment is multiwall carbon nanotubes, the coating width of the conductive adhesive 5 is 0.5mm-5mm, and the coating thickness of the conductive adhesive 5 is 20 μm; the adhesive glue 4 is made of carboxymethyl cellulose, the coating width of the adhesive glue 4 is 1mm-6mm, and the coating thickness is 30 mu m. It has been found by experiment that by arranging the auxiliary assembly according to the above materials and parameters, the ion transmission rate of the anode corner 1 is effectively greater than that of the cathode corner 3 in the same cathode-anode structure.
Preferably, the invention provides another specific embodiment, the material of the conductive adhesive 5 of this embodiment is graphene, the material of the adhesive 4 is polyvinylidene fluoride, and experiments prove that the auxiliary component is arranged according to the material, so that the ion transmission rate of the anode corner 1 in the same cathode-anode structure is greater than that of the cathode corner 3.
Preferably, the invention provides another specific embodiment, the material of the conductive adhesive 5 of this embodiment is nano carbon fiber, the material of the adhesive 4 is tetrafluoroethylene, and the ion transmission rate of the anode corner 1 in the same cathode-anode structure can be made larger than that of the cathode corner 3 by arranging the auxiliary component according to the above material.
Preferably, in the same cathode-anode structure, both ends of the conductive adhesive 5 of the anode corner portion 1 do not exceed both ends of the adhesive 4 of the cathode corner portion 3 in the winding direction, so that the coverage area of the adhesive 4 is larger than that of the conductive adhesive 5 in the same cathode-anode structure, and the number of ions separated from the cathode corner portion 3 is smaller than that of ions embedded in the anode corner portion 1 in the same cathode-anode structure.
Preferably, the cathode plate 30 further comprises a cathode straight portion 2 arranged in a straight line, two ends of the cathode corner portion 3 are respectively connected with the cathode straight portion 2, and the ion transmission rate of the cathode corner portion 3 is smaller than that of the straight portion 2 Yu Yinji, so as to ensure that the added auxiliary assembly can effectively play a role in balancing the electric quantity of the battery.
Preferably, at least three female and male structures located at the innermost layer of the winding structure are provided with auxiliary components, and preferably, since the first three corner regions located at the innermost layer of the winding structure form the female and male structures, the embodiment can meet the requirement of the actual battery for balancing the electric quantity by arranging the auxiliary components on the three female and male structures located at the innermost layer of the winding structure.
With reference to fig. 1-10, the auxiliary assembly is arranged in the same cathode-anode structure, and is used for enabling the ion transmission rate of the anode corner 1 in the same cathode-anode structure to be larger than that of the adjacent cathode corner 3, and the auxiliary assembly is additionally arranged to enable the ion transmission rate of the anode corner 1 in the same cathode-anode structure to be larger than that of the adjacent cathode corner 3, so that under the condition of ensuring the original structure of the battery core, the improvement of a pole piece is reduced as much as possible, the ion transmission efficiency of the anode corner 1 is improved by utilizing the auxiliary assembly, the ion transmission efficiency of the cathode corner 3 is reduced, and therefore the problem of corner lithium precipitation is improved under the influence of small change, and the performance of the battery core is greatly improved.
Based on the foregoing embodiments, the present embodiment provides a battery including the electrode assembly described above, and the structure of the electrode assembly may be referred to the related description hereinbefore. The battery of the present embodiment has advantages that the electrode assembly of the foregoing embodiment has.
Based on the foregoing embodiments, the present embodiment provides a powered device, including the battery as described above, where the battery is configured to provide power for the powered device. The electric device of the present embodiment has the advantages of the electrode assembly of the foregoing embodiment, as described above, with reference to the related description of other structures of the battery.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (11)
1. An electrode assembly, characterized in that: including anode pole piece (10), barrier film (20), cathode pole piece (30) and auxiliary assembly, anode pole piece (10), cathode pole piece (30) and barrier film (20) set up to winding structure along the coiling direction, winding structure is formed with a plurality of corner regions from outside to interior in proper order, is located a plurality of corner region of winding structure's inlayer forms the overcast and wraps the positive structure, auxiliary assembly locates same in the overcast and wraps the positive structure, auxiliary assembly is used for making same the ion transmission rate of positive pole corner (1) in the overcast and wraps the positive structure is greater than the ion transmission rate of adjacent negative pole corner (3).
2. The electrode assembly of claim 1, wherein: the auxiliary assembly comprises a conductive adhesive (5) which is arranged at the anode corner (1) so that the ion transmission rate of the anode corner (1) in the same cathode-anode structure is larger than that of the cathode corner (3).
3. The electrode assembly of claim 2, wherein: in the same cathode-anode structure, the conductive adhesive (5) is arranged on one surface of the anode corner (1) close to the cathode corner (3).
4. The electrode assembly of claim 3, wherein: the auxiliary assembly further comprises adhesive glue (4), and in the same female-male structure, the adhesive glue (4) is arranged on one surface of the cathode corner (3) close to and/or far from the anode corner (1).
5. The electrode assembly of claim 1, wherein: the auxiliary assembly comprises adhesive glue (4), wherein the adhesive glue (4) is arranged at a cathode corner part (3) so that the ion transmission rate of the cathode corner part (3) in the same cathode-anode structure is smaller than that of the anode corner part (1).
6. The electrode assembly of claim 5, wherein: in the same cathode-anode structure, the adhesive glue (4) is arranged on one surface of the cathode corner part (3) close to the anode corner part (1).
7. The electrode assembly of claim 6, wherein: the auxiliary assembly further comprises conductive adhesive (5), and in the same cathode-anode structure, the conductive adhesive (5) is arranged on one surface of the anode corner (1) close to and/or far from the cathode corner (3).
8. The electrode assembly of claim 1, wherein: the auxiliary assembly comprises conductive glue (5) and/or adhesive glue (4), wherein the conductive glue (5) is arranged on two sides of the anode corner (1), and/or the adhesive glue (4) is arranged on two sides of the cathode corner (3).
9. The electrode assembly of any one of claims 4, 7, 8, wherein: in the same female and male structure, both ends of the conductive adhesive (5) in the winding direction do not exceed both ends of the adhesive (4) in the winding direction.
10. A battery, characterized in that: an electrode assembly comprising any one of claims 1-9.
11. An electrical consumer, characterized in that: comprising a battery as claimed in claim 10.
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| CN216648359U (en) * | 2021-11-04 | 2022-05-31 | 惠州锂威新能源科技有限公司 | Battery structure for improving lithium precipitation at corner of anode |
| CN114759272A (en) * | 2022-05-17 | 2022-07-15 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device comprising same and electronic device |
| WO2023130902A1 (en) * | 2022-01-05 | 2023-07-13 | 宁德时代新能源科技股份有限公司 | Winding type electrode assembly, battery cell, battery and electric device |
| CN219371101U (en) * | 2022-12-23 | 2023-07-18 | 浙江锂威能源科技有限公司 | Lithium ion battery winding structure and lithium ion battery |
| CN116666774A (en) * | 2023-07-25 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric equipment |
| CN116799326A (en) * | 2023-07-18 | 2023-09-22 | 浙江锂威能源科技有限公司 | Lithium ion battery and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216648359U (en) * | 2021-11-04 | 2022-05-31 | 惠州锂威新能源科技有限公司 | Battery structure for improving lithium precipitation at corner of anode |
| WO2023130902A1 (en) * | 2022-01-05 | 2023-07-13 | 宁德时代新能源科技股份有限公司 | Winding type electrode assembly, battery cell, battery and electric device |
| CN114759272A (en) * | 2022-05-17 | 2022-07-15 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device comprising same and electronic device |
| CN219371101U (en) * | 2022-12-23 | 2023-07-18 | 浙江锂威能源科技有限公司 | Lithium ion battery winding structure and lithium ion battery |
| CN116799326A (en) * | 2023-07-18 | 2023-09-22 | 浙江锂威能源科技有限公司 | Lithium ion battery and preparation method thereof |
| CN116666774A (en) * | 2023-07-25 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric equipment |
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