CN113708015A - Utmost point ear, pole piece subassembly and battery - Google Patents
Utmost point ear, pole piece subassembly and battery Download PDFInfo
- Publication number
- CN113708015A CN113708015A CN202110750723.3A CN202110750723A CN113708015A CN 113708015 A CN113708015 A CN 113708015A CN 202110750723 A CN202110750723 A CN 202110750723A CN 113708015 A CN113708015 A CN 113708015A
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- China
- Prior art keywords
- battery
- tab
- end part
- end portion
- current collector
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
-
- 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
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
Abstract
The invention belongs to the technical field of lithium batteries, and discloses a tab, a pole piece assembly and a battery, wherein the tab comprises: the upper end part, the first lower end part, the second lower end part and the tab glue, wherein the top end of the first lower end part and the top end of the second lower end part are fixedly connected with the bottom end of the upper end part, the width of the first lower end part and the width of the second lower end part are larger than or equal to that of the upper end part, and the tab glue is arranged in a fixedly connected area. This application is through changing the structure of current utmost point ear, has effectively solved the great problem of battery resistivity when being applied to the complex mass flow body with utmost point ear, and simultaneously, the utmost point ear that this application provided also can be arranged in the lithium ion battery of the conventional metal mass flow body, under the big or small prerequisite that does not increase the mass flow body welding reservation region of battery, has effectively reduced the internal resistance of battery utmost point ear welding department, can effectively reduce the heat production of battery when the battery carries out big multiplying power charge-discharge, effectively promotes the multiplying power performance and the security performance of battery.
Description
Technical Field
The invention belongs to the technical field related to lithium batteries and battery materials, and particularly relates to a tab, a pole piece assembly and a battery.
Background
With the current social development and technological progress, lithium ion batteries have been widely used as power sources for portable electronic products such as mobile communication, portable computers, digital cameras, etc., and power storage systems for electric vehicles, due to the significant advantages of both high specific energy and long cycle life, in the existing secondary battery systems. In recent years, high energy density and long driving range are the key directions for the research and development of lithium batteries, but the instability of the electrode material structure caused by the high energy density easily causes thermal runaway inside the battery, and further causes the battery to explode, so that the attention and the requirement on the safety of the battery are higher and higher, and the battery is expected not to be burnt or exploded after being damaged by violent impact, puncture and the like.
The tab is a metal conductor, is electrically connected with the current collector, and is communicated with an external circuit. The mass flow body that uses always is metal foil mass flow body and compound mass flow body, compares with the metal foil mass flow body, and compound mass flow body can not only reduce the quality, can also effectively increase the security performance. However, the middle layer is non-conductive, and the surface metal layer is thin, so that the welding internal resistance of the composite current collector is large, and the rate performance of the battery is influenced. Therefore, it is necessary to modify the existing tab, so that the conductive performance of the composite current collector lithium ion battery is greatly enhanced, and the tab can also be used for the conventional metal foil current collector lithium ion battery.
CN110335984A discloses a forked tab, an electrode assembly and a battery, which can be used to solve the problem that the intermediate layer of the composite current collector is not conductive, but this way not only adds a process, but also reduces the welding area between the tab and the current collector, and can not effectively reduce the welding internal resistance, and experiments verify that when the metal layers on the upper and lower surfaces of the composite current collector are connected together by ultrasonic welding, the high extrusion force and the welding power can extrude the polymer layer of the composite current collector to one side during welding, and the existence of the high extrusion force and the welding power has almost no influence on the welding internal resistance, so the forked tab can not effectively solve the problem that the welding internal resistance of the composite current collector is large.
CN110190244A discloses a soft-packing battery tab, it widens through carrying out the attenuate to utmost point ear lower extreme, promotes the volume energy density of lithium cell to increase and be used for strengthening the electric current derivation with the area of contact of mass flow body, when this kind of utmost point ear is applied to lithium cell tab welding, not only need increase mass flow body welding reserve area, and be difficult to be applied to the welding of compound mass flow body, the application limitation of this utmost point ear is great.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a tab, a pole piece assembly and a battery, which improve the tab of the prior art and effectively solve the problems in the prior art.
The invention aims to provide a tab, which comprises an upper end part, a first lower end part, a second lower end part and tab glue, wherein the top ends of the first lower end part and the second lower end part are fixedly connected with the bottom end of the upper end part, the widths of the first lower end part and the second lower end part are both larger than or equal to that of the upper end part, and the tab glue is arranged in the fixedly connected area.
Preferably, the first lower end portion and the second lower end portion overlap each other at a widthwise center line thereof, and the first lower end portion and the second lower end portion have the same width.
Preferably, the upper end portion is connected to an external circuit, and the first and second lower end portions are connected to the battery current collector in a clamping manner.
Preferably, the connection is a weld.
Preferably, the tab glue length is greater than the width of the upper end part.
Preferably, an upper surface of a bottom end of the upper end portion is connected to a top end of the first lower end portion, and a lower surface of the bottom end of the upper end portion is connected to a top end of the second lower end portion.
Another object of the present invention is to provide a pole piece assembly, comprising: the tab and the current collector as described above, wherein the first lower end portion and the second lower end portion are connected to the current collector in a clamping manner.
Preferably, the current collector comprises a metal foil current collector or a composite current collector with a non-metal layer as an intermediate layer and metal layers as upper and lower surfaces.
Preferably, the two ends or the middle of the current collector are provided with connecting regions with widths larger than the widths of the first lower end part and the second lower end part of the tab, and the first lower end part and the second lower end part are respectively connected with the upper surface and the lower surface of the connecting regions.
It is another object of the present invention to provide a battery including a battery housing and a pole piece assembly as described above.
Compared with the prior art, the technical scheme of the invention has the following remarkable advantages:
1. the invention effectively solves the problem of large resistivity of the current collector caused by small thickness of a metal layer, particularly existence of a non-metal layer when the existing tab is applied to the composite current collector by changing the structure of the existing tab. Compared with the existing tab, the width of the first lower end part and the width of the second lower end part are set to be larger than that of the upper end part, so that when the tab is welded with the current collector, the welding point position is effectively increased, the welding resistance of the lithium ion battery is reduced, and the electrochemical performance of the lithium ion battery is effectively enhanced.
2. When the composite current collector is adopted, the first lower end part and the second lower end part of the lug are respectively welded on the metal layers on the two sides, so that the influence of the middle non-metal layer is completely avoided, and the resistance of the composite current collector can be effectively reduced. Meanwhile, when the electrode lug is welded, pressure does not need to be increased, so that the risks that the thickness of the upper metal layer and the thickness of the lower metal layer are thinner due to the fact that the middle high polymer layer is squeezed open due to overlarge pressure, the metal layers are easy to break and vacancy under the action of large pressure, welding resistance is increased, and the performance of a battery is affected are effectively avoided.
Drawings
FIG. 1 is a schematic view of a conventional tab
Fig. 2 is a schematic diagram of a tab in an embodiment of the invention
FIG. 3 is a schematic view of a current tab welded to the header area of a current collector
FIG. 4 is a schematic view of a current collector head area with a tab welded thereto according to an embodiment of the present invention
Wherein, 1-upper end part, 2-tab glue, 3-lower end part, 4-first lower end part and 5-second lower end part
Detailed Description
Example 1
The utility model provides a tab, includes that upper end, first tip, second descend tip and utmost point ear to glue, first tip under the tip the second descend the top with the bottom welded fastening of upper end, the tip coincides each other at width direction's axis under upper end, first tip, second, upper end width 4mm, length 20mm, utmost point ear glues length 6mm, width 3mm, first tip width 4mm, length 40mm, tip width 4.5mm, length 40mm under the second.
The battery is prepared from the electrode lug, and the specific method is as follows:
1) coating active substances on the front surface and the back surface of a positive metal current collector, drying, rolling and splitting to prepare pole pieces with the same size, wherein the end part of the current collector is provided with a welding area with the width larger than the width of the first lower end part and the second lower end part of the tab;
2) welding the electrode lugs to the head area of the electrode plate to obtain a positive electrode plate, wherein two sides of the welding area are respectively welded at the first lower end part and the second lower end part;
3) preparing a negative pole piece by adopting the same method as the positive pole piece;
4) and placing a diaphragm between the positive and negative pole pieces, winding the positive and negative pole pieces, injecting liquid, packaging, and forming to manufacture the battery.
Example 2
The utility model provides a tab, includes that upper end, first tip, second descend tip and utmost point ear to glue, first tip under the tip the second descend the top with the bottom welded fastening of upper end, the tip coincides each other at width direction's axis under upper end, first tip, second, upper end width 4mm, length 20mm, utmost point ear glues length 6mm, width 3mm, first tip width 4mm, length 40mm, tip width 4.5mm, length 40mm under the second.
The battery is prepared from the electrode lug, and the specific method is as follows:
1) coating active substances on the front surface and the back surface of the positive composite current collector, drying, rolling and splitting to prepare pole pieces with the same size, wherein the end part of the current collector is provided with a welding area with the width larger than the width of the first lower end part and the second lower end part of the tab;
2) welding the electrode lugs to the head area of the electrode plate to obtain a positive electrode plate, wherein two sides of the welding area are respectively welded at the first lower end part and the second lower end part;
3) preparing a negative pole piece by adopting the same method as the positive pole piece;
4) and placing a diaphragm between the positive and negative pole pieces, winding the positive and negative pole pieces, injecting liquid, packaging, and forming to manufacture the battery.
Comparative example 1
The utility model provides a tab, glues including upper end portion, lower tip and utmost point ear, the top of lower tip with the bottom welded fastening of upper end portion, lower tip coincide each other at width direction's axis, utmost point ear glue sets up connect fixed region, upper end width 4mm, length 20mm, utmost point ear glue length 6mm, width 3mm, lower tip width 4mm, length 40 mm.
The battery is prepared from the electrode lug, and the specific method is as follows:
1) coating active substances on the front surface and the back surface of a positive metal current collector, drying, rolling and splitting to prepare pole pieces with the same size, wherein the end part of the current collector is provided with a welding area with the width larger than the width of the first lower end part and the second lower end part of the tab;
2) welding the electrode lugs to the head area of the electrode plate to obtain a positive electrode plate, wherein two sides of the welding area are respectively welded at the first lower end part and the second lower end part;
3) preparing a negative pole piece by adopting the same method as the positive pole piece;
4) and placing a diaphragm between the positive and negative pole pieces, winding the positive and negative pole pieces, injecting liquid, packaging, and forming to manufacture the battery.
Comparative example 2
The utility model provides a tab, glues including upper end portion, lower tip and utmost point ear, the top of lower tip with the bottom welded fastening of upper end portion, lower tip coincide each other at width direction's axis, utmost point ear glue sets up connect fixed region, upper end width 4mm, length 20mm, utmost point ear glue length 6mm, width 3mm, lower tip width 4mm, length 40 mm.
The battery is prepared from the electrode lug, and the specific method is as follows:
1) coating active substances on the front surface and the back surface of the positive composite current collector, drying, rolling and splitting to prepare pole pieces with the same size, wherein the end part of the current collector is provided with a welding area with the width larger than the width of the first lower end part and the second lower end part of the tab;
2) welding the electrode lugs to the head area of the electrode plate to obtain a positive electrode plate, wherein two sides of the welding area are respectively welded at the first lower end part and the second lower end part;
3) preparing a negative pole piece by adopting the same method as the positive pole piece;
4) and placing a diaphragm between the positive and negative pole pieces, winding the positive and negative pole pieces, injecting liquid, packaging, and forming to manufacture the battery.
The cells of examples 1-2 and comparative examples 1-2 were subjected to a capacity test and a direct current impedance test:
| capacity (mAh) | DC impedance (m omega) | |
| Example 1 | 810 | 45 |
| Example 2 | 785 | 55 |
| Comparative example 1 | 800 | 50 |
| Comparative example 2 | 770 | 60 |
The lug with the improved structure can be seen, and the direct current impedance of the lithium ion battery can be effectively reduced and the battery capacity can be improved no matter the lug is applied to a metal foil current collector or a composite current collector.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a tab, includes, upper end portion, first tip, second tip and utmost point ear glue, its characterized in that, first tip under the second tip the top with the bottom of upper end portion is connected fixedly, first tip with the width of second tip under all is greater than or equal to the upper end portion, utmost point ear glue sets up connect fixed region.
2. The tab as claimed in claim 1, wherein the first and second lower end portions have the same width and are coincident with a widthwise midline of the second lower end portion.
3. The tab as claimed in claim 1, wherein the upper end is connected to an external circuit, and the first and second lower ends are connected to a battery current collector in a clamping manner.
4. A tab as claimed in any one of claims 1 to 3, wherein the connection is welding.
5. A tab as claimed in any one of claims 1 to 3, wherein the tab compound length is greater than the width of the upper end portion.
6. A tab as claimed in any one of claims 1 to 3, wherein the upper surface of the bottom end of the upper end portion is connected with the top end of the first lower end portion, and the lower surface of the bottom end of the upper end portion is connected with the top end of the second lower end portion.
7. A pole piece assembly, comprising: the tab as claimed in any one of claims 1 to 6, and a current collector, wherein the first and second lower end portions are connected with the current collector in a clamping manner.
8. The pole piece assembly of claim 7, wherein the current collector comprises a metal foil current collector or a composite current collector with a non-metallic layer as an intermediate layer and metallic layers as upper and lower surfaces.
9. The pole piece assembly of claim 7 or 8, wherein a connection region having a width larger than the width of the first lower end portion and the second lower end portion of the tab is disposed at two ends or in the middle of the current collector, and the first lower end portion and the second lower end portion are respectively connected with the upper surface and the lower surface of the connection region.
10. A battery comprising a battery housing and a pole piece assembly according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110750723.3A CN113708015A (en) | 2021-07-01 | 2021-07-01 | Utmost point ear, pole piece subassembly and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110750723.3A CN113708015A (en) | 2021-07-01 | 2021-07-01 | Utmost point ear, pole piece subassembly and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113708015A true CN113708015A (en) | 2021-11-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110750723.3A Pending CN113708015A (en) | 2021-07-01 | 2021-07-01 | Utmost point ear, pole piece subassembly and battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN113708015A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299239A (en) * | 2015-05-13 | 2017-01-04 | 深圳市博亿能科技有限公司 | A kind of battery pole piece and ultra-thin flexible-packed battery |
| US20170207438A1 (en) * | 2016-01-20 | 2017-07-20 | Ningde Amperex Technology Limited | Secondary battery |
| CN107919455A (en) * | 2017-12-05 | 2018-04-17 | 中航锂电（洛阳）有限公司 | Battery and its lug, the battery modules using the battery |
| CN209418625U (en) * | 2018-12-12 | 2019-09-20 | 上海德朗能动力电池有限公司 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
| CN110335984A (en) * | 2019-06-28 | 2019-10-15 | 宁德新能源科技有限公司 | A kind of dichotomous tab, electrode assembly and battery |
| CN111375882A (en) * | 2018-12-28 | 2020-07-07 | 中天储能科技有限公司 | Tab welding method and battery prepared by using same |
| CN212412090U (en) * | 2020-05-29 | 2021-01-26 | 珠海冠宇电池股份有限公司 | Current collector and lithium ion battery |
-
2021
- 2021-07-01 CN CN202110750723.3A patent/CN113708015A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299239A (en) * | 2015-05-13 | 2017-01-04 | 深圳市博亿能科技有限公司 | A kind of battery pole piece and ultra-thin flexible-packed battery |
| US20170207438A1 (en) * | 2016-01-20 | 2017-07-20 | Ningde Amperex Technology Limited | Secondary battery |
| CN107919455A (en) * | 2017-12-05 | 2018-04-17 | 中航锂电（洛阳）有限公司 | Battery and its lug, the battery modules using the battery |
| CN209418625U (en) * | 2018-12-12 | 2019-09-20 | 上海德朗能动力电池有限公司 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
| CN111375882A (en) * | 2018-12-28 | 2020-07-07 | 中天储能科技有限公司 | Tab welding method and battery prepared by using same |
| CN110335984A (en) * | 2019-06-28 | 2019-10-15 | 宁德新能源科技有限公司 | A kind of dichotomous tab, electrode assembly and battery |
| CN212412090U (en) * | 2020-05-29 | 2021-01-26 | 珠海冠宇电池股份有限公司 | Current collector and lithium ion battery |
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