CN117083754A - Electrode assembly, battery cell, battery and electric equipment - Google Patents
Electrode assembly, battery cell, battery and electric equipment Download PDFInfo
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- CN117083754A CN117083754A CN202280023539.1A CN202280023539A CN117083754A CN 117083754 A CN117083754 A CN 117083754A CN 202280023539 A CN202280023539 A CN 202280023539A CN 117083754 A CN117083754 A CN 117083754A
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- electrode assembly
- tab
- electrode
- lug
- battery
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- 239000003792 electrolyte Substances 0.000 claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000000178 monomer Substances 0.000 abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052744 lithium Inorganic materials 0.000 abstract description 14
- 238000009792 diffusion process Methods 0.000 abstract description 12
- 230000002349 favourable effect Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 14
- 230000008595 infiltration Effects 0.000 description 12
- 238000001764 infiltration Methods 0.000 description 12
- 238000001556 precipitation Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 239000007773 negative electrode material Substances 0.000 description 7
- 239000007774 positive electrode material Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000004804 winding Methods 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The application provides an electrode assembly, a battery monomer, a battery, electric equipment and manufacturing equipment and method of the electrode assembly, and relates to the technical field of batteries. The electrode assembly includes a body portion and a tab portion; the lug part is arranged at one end of the body part and provided with a lug end face deviating from the body part; the lug part is provided with a diversion trench which is sunken from the end face of the lug to the direction close to the body part, and the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part. Be equipped with from the depressed guiding gutter of direction that the lug terminal surface was close to the body on the lug portion, the guiding gutter can guide the diffusion around the body portion of electrolyte, is equivalent to providing the passageway for the diffusion of electrolyte, is favorable to electrode assembly to be fully soaked by electrolyte for the battery monomer that has used this electrode assembly has good circulation performance and reduces the risk that battery monomer was separated out lithium, and then improves battery monomer's performance.
Description
The application relates to the technical field of batteries, in particular to an electrode assembly, a battery cell, a battery, electric equipment and manufacturing equipment and method of the electrode assembly.
The battery is widely used in electronic equipment, such as electric equipment of mobile phones, notebook computers, battery cars, electric automobiles, electric ships, electric toy cars, electric toy ships, electric tools and the like.
In the development of battery technology, besides improving the safety performance of a battery, the performance of the battery is also an important and non-negligible problem, and the battery needs to have good performance of the battery to ensure that electric equipment works normally. Therefore, how to improve the performance of the battery is a problem to be solved in the battery technology field.
Disclosure of Invention
The embodiment of the application provides an electrode assembly, a battery monomer, a battery, electric equipment and manufacturing equipment and method of the electrode assembly so as to improve the performance of the battery.
In a first aspect, embodiments of the present application provide an electrode assembly comprising a body portion and a tab portion; the lug part is arranged at one end of the body part and is provided with a lug end face which is away from the body part; the electrode lug part is provided with a diversion trench which is sunken from the end face of the electrode lug to the direction close to the body part, and the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part.
Among the above-mentioned technical scheme, be equipped with from the terminal surface of utmost point ear on the utmost point ear to the sunken guiding gutter of direction that is close to the body, the guiding gutter can guide the diffusion around the body portion of electrolyte, is equivalent to providing the passageway for the diffusion of electrolyte, is favorable to electrode assembly by the abundant infiltration of electrolyte for the battery monomer that has used this electrode assembly has good cyclic performance and reduces the risk that the battery monomer was out lithium, and then improves the performance of battery monomer.
In some embodiments of the first aspect of the present application, the diversion trench is formed by upsetting the tab end surface.
Among the above-mentioned technical scheme, through mound pressure tab terminal surface in order to form the guiding gutter, the shaping mode is simple, swift, can improve shaping efficiency. In addition, the possibility of upsetting damage to the lug part and the body part is small, so that the risk of influencing the flow conductivity of the electrode assembly is reduced; the tab portions can also be compacted in a direction toward the body portion, reducing the volume of the electrode assembly.
In some embodiments of the first aspect of the present application, the electrode assembly further comprises: and the central hole is formed in the body part, penetrates through the end face of the tab, and is communicated with the guide groove.
In the technical scheme, the diversion trench is communicated with the central hole, electrolyte in the central hole can diffuse to the periphery of the body part through the diversion trench, and the electrolyte around the body part can flow to the central hole, so that the electrode assembly is fully infiltrated.
In some embodiments of the first aspect of the application, the channel extends through an edge of the tab portion in a direction perpendicular to the axis of the central bore and in a direction away from the axis of the central bore.
In the above technical scheme, the guiding gutter runs through the edge of the lug part for the electrolyte can diffuse outside the edge of the body part, so that the electrolyte can fully infiltrate the electrode assembly fast.
In some embodiments of the first aspect of the present application, the width of the flow guide groove increases gradually in a direction perpendicular to the axis of the central hole and in a direction away from the axis of the central hole.
In the above technical scheme, in the direction perpendicular to the axis of the central hole and along the direction deviating from the axis of the central hole, the width of the diversion trench is gradually increased, in other words, the width of the diversion trench is gradually increased from the central hole to the direction close to the edge of the lug part, thereby being beneficial to the rapid flow of electrolyte from the central hole to the edge of the lug part and improving the infiltration efficiency.
In some embodiments of the first aspect of the present application, the minimum width of the diversion trench is smaller than the aperture of the central aperture.
In the technical scheme, the minimum width of the diversion trench is smaller than the aperture of the central hole, so that electrolyte can diffuse to the periphery at a reasonable flow rate, and uniform infiltration of the electrode assembly is ensured.
In some embodiments of the first aspect of the present application, the diversion trench is an equal-width trench.
In the technical scheme, the diversion trenches have the same-width structure, and are convenient to manufacture and form.
In some embodiments of the first aspect of the present application, the width of the diversion trench is greater than the aperture of the central aperture.
In the technical scheme, the width of the diversion trench is larger than the aperture of the central hole, so that the flow of the electrolyte in the diversion trench is improved, the electrolyte is enabled to diffuse to the periphery rapidly, and the infiltration efficiency is improved.
In some embodiments of the first aspect of the present application, a groove sidewall of the diversion groove is a cambered surface.
In the technical scheme, the side wall of the diversion trench is the cambered surface, so that the efficiency of the diffusion of the electrolyte to the periphery is improved, and the infiltration efficiency is improved.
In some embodiments of the first aspect of the present application, the tab end surface is formed with a plurality of the diversion trenches, and the diversion trenches are spaced around the central hole.
In the technical scheme, the plurality of diversion trenches are formed on the end face of the tab, so that the efficiency of the electrolyte diffusing to the periphery of the body part can be improved, and the infiltration efficiency is improved.
In some embodiments of the first aspect of the present application, the plurality of the flow guide grooves are uniformly spaced around the central hole.
In the above technical scheme, the plurality of diversion trenches are uniformly arranged at intervals along the circumferential direction of the electrode assembly, so that the electrolyte diffused to the periphery of the body part is uniformly distributed, and the electrode assembly can be uniformly infiltrated.
In a second aspect, embodiments of the present application provide a battery cell comprising a housing and an electrode assembly provided by embodiments of the first aspect; the housing is used for accommodating the electrode assembly, and is provided with an electrode output part which is used for being connected with the end face of the tab.
Among the above-mentioned technical scheme, electrode assembly be equipped with from the terminal surface of utmost point ear to the sunken guiding gutter of direction that is close to the body on the utmost point ear, the guiding gutter can guide the diffusion around the body portion of electrolyte, is equivalent to providing the passageway for the diffusion of electrolyte, is favorable to electrode assembly by the abundant infiltration of electrolyte for battery monomer has good cyclic performance and reduces the risk that battery monomer was separated out lithium, and then improves battery monomer's performance.
In some embodiments of the second aspect of the present application, the battery cell further includes: and the current collecting member is accommodated in the shell, the current collecting member abuts against the end face of the tab, and the current collecting member is connected to the electrode output part.
In the technical scheme, the current collecting member is abutted against the end face of the tab, and the current collecting member is connected to the electrode output part, and due to the arrangement of the diversion trench, a circulation channel of electrolyte is formed between the current collecting member and the end face, so that the electrolyte is facilitated to infiltrate the electrode assembly.
In some embodiments of the second aspect of the present application, the tab end surface is welded with the current collecting member to form a weld extending in a radial direction or a circumferential direction of the electrode assembly at the tab end surface.
In the technical scheme, welding marks extending along the radial direction or the circumferential direction of the electrode assembly are formed on the end faces of the electrode lugs, so that the welding area of the end faces of the electrode lugs and the current collecting member is increased, and the current guiding capacity is improved.
In a third aspect, embodiments of the present application provide a battery, including the battery cell provided in the embodiment of the second aspect.
In a fourth aspect, an embodiment of the present application provides an electric device, including a battery provided by an embodiment of the third aspect.
In a fifth aspect, embodiments of the present application provide an apparatus for manufacturing an electrode assembly, including a providing device and a upsetting device; the providing device is configured to provide an electrode assembly including a body portion and a tab portion disposed at one end of the body portion, the tab portion having a tab end face disposed away from the body portion; the upsetting device is configured to upsett the tab end surface to form a diversion trench recessed from the tab end surface toward a direction close to the body portion at the tab portion, the diversion trench being used for guiding the electrolyte to diffuse around the body portion.
According to the technical scheme, the diversion trench which is sunken from the end face of the tab to the direction close to the body is arranged on the tab part, and can guide electrolyte to diffuse to the periphery of the body, so that a channel is provided for the diffusion of the electrolyte, the electrode assembly is fully soaked by the electrolyte, and the battery cell using the electrode assembly has good circulation performance and the risk of lithium precipitation of the battery cell is reduced. The lug end faces are mounded by the mound pressing device to form the diversion trenches, the forming mode is simple and quick, and the forming efficiency can be improved. In addition, the possibility of upsetting damage to the lug part and the body part is small, so that the risk of influencing the flow conductivity of the electrode assembly is reduced; the tab portions can also be compacted in a direction toward the body portion, reducing the volume of the electrode assembly.
In a sixth aspect, an embodiment of the present application provides a method of manufacturing an electrode assembly, including:
providing an electrode assembly comprising a body portion and a tab portion, the tab portion being disposed at one end of the body portion, the tab portion having a tab end face disposed away from the body portion;
and upsetting the lug end surface to form a diversion trench recessed from the lug end surface to a direction close to the body part, wherein the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part.
According to the technical scheme, the diversion trench can guide the electrolyte to diffuse to the periphery of the body part, which is equivalent to providing a channel for the diffusion of the electrolyte, so that the electrode assembly is fully soaked by the electrolyte, and the battery cell using the electrode assembly has good circulation performance and reduces the risk of lithium precipitation of the battery cell. The lug end face is provided with the diversion trench in a upsetting mode, so that the forming mode is simple and quick, and the forming efficiency can be improved. In addition, the possibility of damaging the lug part and the body part in a upsetting way is small, so that the risk of influencing the flow conductivity of the electrode assembly is reduced; the tab portions can also be compacted in a direction toward the body portion, reducing the volume of the electrode assembly.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;
fig. 2 is a schematic structural diagram of a battery according to some embodiments of the present application;
fig. 3 is an exploded view of a battery cell according to some embodiments of the present application;
FIG. 4 is a schematic view of an electrode assembly according to some embodiments of the present application;
FIG. 5 is an axial view of an electrode assembly provided in some embodiments of the application;
fig. 6 is a schematic view illustrating the structure of an electrode assembly according to other embodiments of the present application;
fig. 7 is an axial view of the electrode assembly of fig. 6;
fig. 8 is a schematic view illustrating the structure of an electrode assembly according to still other embodiments of the present application;
fig. 9 is an axial view of the electrode assembly of fig. 8;
fig. 10 is a schematic view of the current collecting member abutting against the end face of the tab;
Fig. 11 is a schematic structural view of a manufacturing apparatus for an electrode assembly according to some embodiments of the present application;
fig. 12 is a flow chart of a method of manufacturing an electrode assembly according to some embodiments of the present application.
Icon: 1000-vehicle; 100-cell; 10-a box body; 11-installation space; 12-a first part; 13-a second part; 20-battery cells; 21-a housing; 211-a housing; 2111-opening; 2112—bottom case; 212-end caps; 213-electrode output; 22-electrode assembly; 221-a body portion; 222-pole ear; 222 a-positive tab; 222 b-a negative tab; 2221-tab end face; 2222-flow guide groove; 2223—the edge of the tab portion; 223-a central aperture; 23-a current collecting member; 23 a-positive current collecting member; 23 b-a negative current collecting member; 24-insulating member; 25-seals; 26-a diversion channel; 200-a controller; 300-motor; 2000-manufacturing equipment of the electrode assembly; 2100-providing means; 2200-upsetting means.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the product of this application is used, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.
The battery cell includes a case and an electrode assembly 22 accommodated in the case. The electrode assembly consists of a positive plate, a negative plate and a separation film. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.
The electrode lug of the electrode assembly can be a lug formed after die cutting, or can be a full lug formed without die cutting. The inventor finds that in order to reduce the volume of the electrode assembly and facilitate welding of the electrode lug and the current collecting disc, the electrode lug needs to be flattened, especially the full electrode lug, and the flattened electrode lug forms an electrode lug end face which is tightly attached to the current collecting disc and welded, so that electrolyte is difficult to infiltrate the electrode assembly from the electrode lug end face, and the performance of a battery cell is seriously affected.
Based on the above-mentioned consideration, in order to alleviate the problem that the electrode assembly is difficult to be infiltrated by the electrolyte from the tab end face because the tab end face formed after the tab is kneaded and flat is tightly attached to and welded with the current collecting disc, the inventor has conducted intensive studies and has designed an electrode assembly, and through being provided with the guiding groove recessed from the tab end face to the direction close to the body on the tab, the guiding groove can guide the electrolyte to diffuse around the body, which is equivalent to providing a channel for the diffusion of the electrolyte, and is favorable for the electrode assembly to be fully infiltrated by the electrolyte, so that the battery cell using the electrode assembly has good cycle performance and reduces the risk of lithium precipitation of the battery cell, and further improves the performance of the battery cell.
The electrode assembly disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system of the power utilization device can be composed of the battery monomer, the battery and the like with the electrode assembly disclosed by the application, so that the electrode assembly 22 is fully soaked by electrolyte, the battery monomer using the electrode assembly has good cycle performance, the risk of lithium precipitation of the battery monomer is reduced, and the performance of the battery monomer is further improved.
The technical scheme described by the embodiment of the application is suitable for the battery and the electric equipment using the battery.
The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid power vehicle or a range-extending vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.
For convenience of description, the following embodiments take the electric device as the vehicle 1000 as an example.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000.
The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.
In some embodiments of the application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10.
The case 10 serves to provide an installation space 11 for the battery cells 20. In some embodiments, the case 10 may include a first portion 12 and a second portion 13, the first portion 12 and the second portion 13 being overlapped with each other to define an installation space 11 for receiving the battery cell 20. Of course, the connection between the first portion 12 and the second portion 13 may be sealed by a sealing member 25 (not shown), and the sealing member 25 may be a sealing ring, a sealant, or the like.
The first portion 12 and the second portion 13 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first part 12 may be a hollow structure having one side opened to form a receiving cavity for receiving the battery cell 20, and the second part 13 may be a hollow structure having one side opened to form a receiving cavity for receiving the battery cell 20, and the opening side of the second part 13 is closed to the opening side of the first part 12, thereby forming the case 10 having the installation space 11. Of course, the first portion 12 may be a hollow structure having one side opened to form a receiving chamber for receiving the battery cell 20, the second portion 13 may be a plate-like structure, and the second portion 13 may be covered on the opened side of the first portion 12 to form the case 10 having the installation space 11.
In the battery 100, the number of the battery cells 20 may be one or a plurality. If there are multiple battery cells 20, the multiple battery cells 20 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, a plurality of battery cells 20 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and be accommodated in the case 10. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. Fig. 2 exemplarily shows a case in which the battery cell 20 is in the shape of a cylinder.
In some embodiments, the battery 100 may further include a bus bar (not shown), through which the plurality of battery cells 20 may be electrically connected to each other, so as to realize serial connection, parallel connection, or a series-parallel connection of the plurality of battery cells 20.
Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 may include a case 21 and an electrode assembly 22. The case 21 includes a housing 211 and an end cap 212, the case 21 having an opening 2111, the electrode assembly 22 being received in the housing 211, and the end cap 212 being for covering the opening 2111.
The housing 21 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 21 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the case 21 may alternatively have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the case 21 may alternatively have a rectangular parallelepiped structure. Fig. 3 exemplarily shows a case where the case 21 and the electrode assembly 22 are cylindrical.
The material of the housing 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which is not particularly limited in the embodiment of the present application.
The end cap 212 serves to cover the opening 2111 of the case 211 of the housing 21 to form a closed receiving space (not shown) for receiving the electrode assembly 22. The accommodation space is also used for accommodating an electrolyte, such as an electrolyte solution. An electrode output part 213 outputting the electric power of the electrode assembly 22 may be provided on the end cap 212, such as an electrode terminal provided on the end cap 212. The electrode terminals in the end cap 212 assembly are used to electrically connect with the electrode assembly 22, i.e., the electrode terminals are electrically connected with the tabs of the electrode assembly 22, for example, the electrode terminals are connected with the tabs through the current collecting member 23 to achieve the electrical connection of the electrode terminals with the tabs.
The number of the openings 2111 of the housing 211 may be one or two. If the opening 2111 of the housing 211 is one, the end cap 212 may be one, and two electrode terminals may be disposed on the end cap 212, where the two electrode terminals are respectively used for electrically connecting with the positive electrode tab 222a and the negative electrode tab 222b of the electrode assembly 22, and the two electrode terminals on the end cap 212 are respectively a positive electrode terminal and a negative electrode terminal. If there are two openings 2111 of the housing 211, for example, two openings 2111 are disposed on opposite sides of the housing 211, there may be two end caps 212, and the two end caps 212 are respectively covered at the two openings 2111 of the housing 211. In this case, it may be that an electrode terminal provided on one of the end caps 212 is a positive electrode terminal for electrical connection with the positive tab 222a of the electrode assembly 22; the electrode terminal on the other end cap 212 is a negative electrode terminal for electrical connection with the negative tab of the electrode assembly 22.
In an embodiment in which the end cap 212 is one, only one electrode terminal for electrically connecting with one of the positive electrode tab 222a and the negative electrode tab 222b of the electrode assembly 22, and the other of the positive electrode tab 222a and the negative electrode tab 222b of the electrode assembly 22 is electrically connected with the case 21 may be provided on the end cap 212. As shown in fig. 3, the positive electrode tab 222a and the negative electrode tab 222b of the electrode assembly 22 are provided at both ends of the electrode assembly 22 in the axial direction, respectively. The positive tab 222a of the electrode assembly 22 is electrically connected to the electrode terminal on the end cap 212 through the positive current collecting member 23a, and the negative tab 222b of the electrode assembly 22 is electrically connected to the case 211 through the negative current collecting member 23b, for example, the negative tab 222b is electrically connected to the bottom case 2112 of the case 211 through the negative current collecting member 23 b. The electrode assembly 22 further includes an insulating member 24 and a sealing member 25, the insulating member 24 being disposed between the electrode terminal and the end cap 212 for insulating the electrode terminal from the end cap 212. A sealing member 25 is disposed between the electrode terminal and the end cap 212 for sealing between the electrode terminal and the end cap 212.
The electrode assembly 22 may include a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator (not shown). The electrode assembly 22 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or may be a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet. The electrode assembly 22 further includes a positive tab 222a (not shown) and a negative tab 222b (not shown), which may be a positive current collector without a positive active material layer in the positive electrode sheet as the positive tab 222a and a negative current collector without a negative active material layer in the negative electrode sheet as the negative tab 222b.
As shown in fig. 3 and 4, fig. 4 is a schematic structural view of an electrode assembly 22 according to some embodiments of the present application. Electrode assembly 22 includes a body portion 221 and a tab portion 222; the tab 222 is disposed at one end of the body 221, and the tab 222 has a tab end surface 2221 disposed away from the body 221; the tab 222 is provided with a guide groove 2222 recessed from the tab end surface 2221 in a direction toward the main body 221, and the guide groove 2222 guides the electrolyte to diffuse around the main body 221.
The tab 222 is a flattened tab. The tab 222 may be a positive tab 222a or a negative tab 222b. The electrode assembly 22 may have the tab end surface 2221 of the positive electrode tab 222a provided with the guide groove 2222, the tab end surface 2221 of the negative electrode tab 222b provided with the guide groove 2222, or the tab end surface 2221 of the positive electrode tab 222a and the tab end surface 2221 of the negative electrode tab 222b provided with the guide groove 2222.
The tab 222 is provided with the diversion trench 2222 recessed from the tab end face 2221 towards the direction close to the body, and the diversion trench 2222 can guide the electrolyte to diffuse around the body 221, which is equivalent to providing a channel for the electrolyte to diffuse, thereby being beneficial to the electrode assembly 22 to be fully infiltrated by the electrolyte, leading the battery cell 20 using the electrode assembly 22 to have good circulation performance and reducing the risk of lithium precipitation of the battery cell 20, and further improving the performance of the battery cell 20.
There are many ways to form the guide grooves 2222 in the tab end surfaces 2221 of the tab portions 222, such as cutting. In some embodiments, the grooves 2222 are formed by upsetting the tab end surfaces 2221.
The pressing means 2200 applies pressure in a direction approaching to the body 221 after the pressing surface of the pressing means 2200 contacts with the tab end surface 2221, so as to compact and flatten the tab to form the tab 222. By providing the protrusions on the pier pressing surface of the pier pressing apparatus 2200, after the pier pressing is completed, the guide grooves 2222 matching with the protrusion are formed on the tab end surfaces 2221.
Through mound pressing tab terminal surface 2221 with formation guiding gutter 2222, the shaping mode is simple, swift, can improve shaping efficiency. In addition, the possibility of upsetting damage to the tab portion 222 and the body portion 221 is small, reducing the risk of affecting the current carrying capacity of the electrode assembly 22; it also allows tab portion 222 to compact in a direction approaching body portion 221, reducing the volume of electrode assembly 22 and facilitating welding with current collecting member 23.
With continued reference to fig. 4, in some embodiments, the electrode assembly 22 further includes: a center hole 223, a portion of the center hole 223 is formed in the body 221, and the center hole 223 penetrates through the tab end surface 2221, and the guide groove 2222 communicates with the center hole 223.
For the rolled electrode assembly 22, the central hole 223 is the rolled central hole 223 of the electrode assembly 22. A portion of the center hole 223 is formed in the body portion 221, and another portion of the center hole 223 is formed in the tab 222 and penetrates the tab end face 2221. One end of the flow guide groove 2222 communicates with the center hole 223 in the radial direction of the electrode assembly 22. The radial direction of the electrode assembly 22 is a direction perpendicular to the axis of the center hole 223. The other end of the guide groove 2222 may penetrate the edge 2223 of the tab portion or may not penetrate the edge 2223 of the tab portion in a direction perpendicular to the axis of the center hole 223 and in a direction away from the axis of the center hole 223.
Of course, for the laminated-type electrode assembly 22, the center hole 223 may be a center hole 223 reserved at the middle.
The flow guide grooves 2222 are communicated with the central hole 223, and the electrolyte in the central hole 223 can diffuse to the periphery of the body part 221 through the flow guide grooves 2222, and the electrolyte around the body part 221 can flow to the central hole 223, so that the electrode assembly 22 is fully infiltrated.
Referring to fig. 4 and 5, fig. 5 is an axial view of an electrode assembly 22 according to some embodiments of the present application. In some embodiments, the channels 2222 extend through the edge 2223 of the tab portion in a direction perpendicular to the axis of the central aperture 223 and in a direction away from the axis of the central aperture 223.
The edge 2223 of the tab portion is an outer peripheral surface of the tab portion 222 disposed around the axis of the center hole 223. It is understood that the outer circumference of the body part 221 communicates with the central hole 223 of the electrode assembly 22 through the flow guide groove 2222 in a direction perpendicular to the axis of the central hole 223.
The guide grooves 2222 penetrate through the edges 2223 of the tab portions so that the electrolyte can diffuse out of the edges of the body portion 221, and also can flow from the outside of the edges of the body toward the center hole 223, so that the electrolyte can quickly and sufficiently infiltrate the electrode assembly 22.
As shown in fig. 4 and 5, in some embodiments, the width of the grooves 2222 increases gradually in a direction perpendicular to the axis of the central hole 223 and in a direction away from the axis of the central hole 223.
In fig. 4 and 5, the diversion trench 2222 has a fan shape. Of course, in other embodiments, the grooves 2222 may be formed in other shapes. The width of the guide groove 2222 may also be other variations, for example, the width of the guide groove 2222 is gradually increased in the direction perpendicular to the axis of the central hole 223 and in the direction away from the axis of the central hole 223, and then the width is kept uniform.
In the direction perpendicular to the axis of the center hole 223 and in the direction away from the axis of the center hole 223, the width of the guide groove 2222 is gradually increased, in other words, the width of the guide groove 2222 is gradually increased from the center hole 223 to the direction close to the edge 2223 of the tab part, which is favorable for the rapid flow of the electrolyte from the center hole 223 to the edge 2223 of the tab part, and improves the infiltration efficiency.
With continued reference to fig. 5, the minimum width of the grooves 2222 is smaller than the aperture of the central hole 223.
In fig. 5, the width of the flow guide groove 2222 is gradually increased in a direction perpendicular to the axis of the center hole 223 and in a direction away from the axis of the center hole 223, and then the minimum width position of the flow guide groove 2222 is the end closest to the axis of the center hole 223, i.e., H1 < D1. The aperture is the diameter of the central aperture 223. In embodiments where the central aperture 223 is not a circular aperture, the aperture of the central aperture 223 may be the diameter resulting from equating the central aperture 223 to a circular aperture.
The minimum width of the diversion trench 2222 is smaller than the aperture of the central hole 223, so that the electrolyte can diffuse to the surrounding at a reasonable flow rate, and the uniform infiltration of the electrode assembly 22 is ensured.
Referring to fig. 6 and 7, fig. 6 is a schematic structural view of an electrode assembly 22 according to another embodiment of the application, and fig. 7 is an axial view of the electrode assembly 22 in fig. 6. In other embodiments, the grooves 2222 are uniform width grooves.
The grooves 2222 are equal-width grooves, which means that the groove widths of any positions of the grooves 2222 are equal in the direction perpendicular to the axis of the center hole 223.
The diversion trench 2222 has the same width structure, and is convenient for manufacturing and forming.
With continued reference to fig. 6 and 7, in some embodiments, the width of the grooves 2222 is greater than the aperture of the central hole 223.
In fig. 6 and 7, the groove width H2 of the guide groove 2222 and the aperture D1 of the center hole 223 satisfy h2=d1.
In embodiments where the grooves 2222 are non-uniform width grooves, the width of the grooves 2222 is greater than the aperture of the central aperture 223, meaning that the minimum width of the grooves 2222 is greater than the aperture of the central aperture 223.
The width of the diversion trench 2222 is larger than the aperture of the central hole 223, which is beneficial to improving the flow rate of the electrolyte in the diversion trench 2222, thereby leading the electrolyte to diffuse to the surrounding rapidly and improving the infiltration efficiency.
The guide groove 2222 has two groove side walls arranged opposite to each other, and the two opposite groove side walls define the width of the guide groove 2222. The groove side walls of the grooves 2222 may be different forms of faces. For example, as shown in fig. 8 and 9, fig. 8 is a schematic structural view of an electrode assembly 22 according to still other embodiments of the present application, and fig. 9 is an axial view of the electrode assembly 22 in fig. 8. In some embodiments, the groove sidewall of the diversion groove 2222 is a cambered surface.
The cambered surface can be a convex cambered surface or a concave cambered surface. The concave arc surface refers to an arc surface of the concave of the groove sidewall far away from the inside of the diversion trench 2222. The convex arc surface is an arc surface of the groove sidewall protruding toward the inside of the diversion trench 2222. The form of the groove side wall being a concave arc is shown in figures 7 and 8.
In other embodiments, the slot sidewalls of the grooves 2222 may be planar (as shown in fig. 4-7).
The groove sidewall of the diversion groove 2222 is a cambered surface, which is favorable for improving the efficiency of the diffusion of the electrolyte to the surrounding, thereby improving the infiltration efficiency.
Referring to fig. 4-9, in some embodiments, a plurality of guide grooves 2222 are formed on the tab end surface 2221, and the plurality of guide grooves 2222 are spaced around the central hole 223.
Two means two or more. A welding area is defined between two adjacent diversion trenches 2222, and the welding area is used for welding the tab portion 222 and the electrode output portion 213, so as to realize the electrical connection between the tab portion 222 and the electrode output portion 213. The shape of the plurality of diversion trenches 2222 may be the same or different. The groove widths of the plurality of grooves 2222 may be the same or different.
In some embodiments, two adjacent channels 2222 communicate in pairs along the circumference of electrode assembly 22. For example, as shown in fig. 6 and 7. The width of the guide grooves 2222 is greater than the aperture of the central hole 223, and then two adjacent guide grooves 2222 communicate in the circumferential direction of the electrode assembly 22. In the case where the number of the guide grooves 2222 is sufficient, two adjacent guide grooves 2222 may be communicated in pairs in the circumferential direction of the electrode assembly 22.
In other embodiments, only one guide groove 2222 may be provided on the tab end surface 2221.
The tab end surface 2221 is formed with a plurality of diversion grooves 2222, and can improve the efficiency of the diffusion of the electrolyte to the periphery of the main body 221, thereby improving the infiltration efficiency.
With continued reference to fig. 4-9, in some embodiments, a plurality of grooves 2222 are evenly spaced about the central aperture 223.
The central angles corresponding to two adjacent diversion trenches 2222 are the same. Of course, the plurality of diversion trenches 2222 may be arranged around the central hole 223 at intervals in a non-uniform state according to actual needs.
The plurality of guide grooves 2222 are uniformly spaced apart in the circumferential direction of the electrode assembly 22 to uniformly distribute the electrolyte diffused to the circumference of the body part 221 so that the electrode assembly 22 can be uniformly impregnated.
The embodiment of the present application provides a battery cell 20, the battery cell 20 including a case 21 and the electrode assembly 22 provided in any of the above embodiments; the case 21 is for accommodating the electrode assembly 22, and the case 21 has an electrode output portion 213, and the electrode output portion 213 is for connection with the tab end face 2221.
The electrode output portion 213 may be an electrode terminal provided in the end cap 212 or may be the case 211 of the housing 21. The electrode output portion 213 may be directly connected to the tab end surface 2221, or may be indirectly connected to the tab end surface 2221. In the embodiment in which the electrode output portion 213 is directly connected to the tab end surface 2221, the surface of the electrode output portion 213 facing the tab end surface 2221 abuts against the tab end surface 2221, and the portion of the surface of the electrode output portion 213 facing the tab end surface 2221 opposite to the flow guide groove 2222 and the flow guide groove 2222 together define a channel through which the electrolyte flows.
The electrode assembly 22 is provided with the diversion trench 2222 which is recessed from the lug end face 2221 to the direction close to the body on the lug 222, and the diversion trench 2222 can guide the electrolyte to diffuse to the periphery of the body 221, which is equivalent to providing a channel for the electrolyte to diffuse, thereby being beneficial to the electrode assembly 22 to be fully infiltrated by the electrolyte, leading the battery cell 20 to have good circulation performance and reducing the risk of lithium precipitation of the battery cell 20, and further improving the performance of the battery cell 20.
As shown in fig. 10, fig. 10 is a schematic view of the current collecting member 23 abutting against the tab end surface 2221. In some embodiments, the battery cell 20 further comprises: a current collecting member 23 is accommodated in the case 21, the current collecting member 23 abuts against the tab end face 2221, and the current collecting member 23 is connected to the electrode output portion 213.
The current collecting member 23 is housed in the case 21, and the tab 222 is indirectly connected to the electrode output portion 213 through the current collecting member 23. The surface of the current collecting member 23 facing the tab end surface 2221 abuts against the tab end surface 2221, and the portion of the surface of the current collecting member 23 facing the tab end surface 2221 opposite to the flow guide groove 2222 and the flow guide groove 2222 together define a flow guide channel 26 through which the electrolyte flows.
The current collecting member 23 abuts against the end surface 2221 of the tab, the current collecting member 23 is connected to the electrode output part 213, and due to the arrangement of the diversion trench 2222, a circulation channel of electrolyte is formed between the current collecting member 23 and the end surface, which is beneficial for the electrolyte to infiltrate the electrode assembly 22.
In some embodiments, the tab end surface 2221 is welded with the current collecting member 23 to form a weld extending in the radial direction or the circumferential direction of the electrode assembly 22 at the tab end surface 2221.
The current collecting member 23 may directly abut against the tab end surface 2221, and the electrode output portion 213 abuts against the electrode output portion 213, so that the tab portion 222 and the electrode output portion 213 are electrically connected by the current collecting member 23.
The tab end surface 2221 forms a welding area between two adjacent diversion trenches 2222, each welding area is welded with the current collecting member 23. The welding may be laser sweep welding. The depth of the laser scan should be smaller than the depth of the diversion trench 2222, so that after the current collecting member 23 and the welding area are welded, a diversion channel 26 is formed between the current collecting member 23 and the tab portion 222.
The welding may extend in the radial direction of the electrode assembly 22 or in the circumferential direction of the electrode assembly 22, so that the welding area between the tab end surface 2221 and the current collecting member 23 is increased, and the current guiding capability is improved.
The embodiment of the present application also provides a battery 100, including the battery cell 20 provided in any of the above embodiments.
The embodiment of the application also provides electric equipment, which comprises the battery 100 provided by the embodiment.
As shown in fig. 11, the embodiment of the present application also provides an electrode assembly manufacturing apparatus 2000, the electrode assembly manufacturing apparatus 2000 including a providing device 2100 and a upsetting device 2200; the providing device 2100 is configured to provide an electrode assembly 22, the electrode assembly 22 including a body portion 221 and a tab portion 222, the tab portion 222 being disposed at one end of the body portion 221, the tab portion 222 having a tab end face 2221 disposed away from the body portion 221; the crimping device 2200 is configured to crimp the tab end surface 2221 so as to form a flow guide groove 2222 recessed from the tab end surface 2221 in a direction approaching the body portion 221 in the tab portion 222, the flow guide groove 2222 being for guiding the electrolyte to diffuse around the body portion 221.
The tab 222 is provided with the diversion trench 2222 recessed from the tab end face 2221 towards the direction close to the body, and the diversion trench 2222 can guide the electrolyte to diffuse around the body 221, which is equivalent to providing a channel for the electrolyte to diffuse, thereby being beneficial to the electrode assembly 22 to be fully infiltrated by the electrolyte, so that the battery cell 20 using the electrode assembly 22 has good circulation performance and reduces the risk of lithium precipitation of the battery cell 20. The lug end surface 2221 is mound pressed through the mound device 2200 so as to form the guiding gutter 2222, and the shaping mode is simple and quick, and the shaping efficiency can be improved. In addition, the possibility of upsetting damage to the tab portion 222 and the body portion 221 is small, reducing the risk of affecting the current carrying capacity of the electrode assembly 22; the tab portion 222 can also be compacted in a direction approaching the body portion 221, reducing the volume of the electrode assembly 22.
As shown in fig. 12, the embodiment of the present application further provides a method for manufacturing an electrode assembly 22, the method for manufacturing an electrode assembly 22 including:
s100, providing an electrode assembly 22, the electrode assembly 22 including a body portion 221 and a tab portion 222, the tab portion 222 being disposed at one end of the body portion 221, the tab portion 222 having a tab end surface 2221 disposed away from the body portion 221;
s200, the tab end surface 2221 is swaged to form a guide groove 2222 recessed from the tab end surface 2221 in a direction toward the main body 221 in the tab 222, and the guide groove 2222 is used to guide the electrolyte to spread around the main body 221.
The flow guiding groove 2222 can guide the electrolyte to diffuse to the periphery of the body 221, which is equivalent to providing a channel for the electrolyte to diffuse, and is beneficial for the electrode assembly 22 to be fully soaked by the electrolyte, so that the battery cell 20 using the electrode assembly 22 has good circulation performance and reduces the risk of lithium precipitation of the battery cell 20. Through the mode of mound pressure in order to form guiding gutter 2222 at utmost point ear terminal surface 2221, the shaping mode is simple, swift, can improve shaping efficiency. In addition, the possibility of damaging the tab portion 222 and the body portion 221 by the upsetting is small, and the risk of affecting the flow conductivity of the electrode assembly 22 is reduced; the tab portion 222 can also be compacted in a direction approaching the body portion 221, reducing the volume of the electrode assembly 22.
The embodiment of the application provides a cylindrical battery cell 20, which comprises a shell 21 and an electrode assembly 22, wherein the electrode assembly 22 is accommodated in the shell 21. The electrode assembly 22 includes a body 221 and tab portions 222, the tab portions 222 being provided at opposite ends of the body 221, one being a positive tab 222a and the other being a negative tab 222b. Tab end surfaces 2221 of both tab portions 222 are provided with diversion grooves 2222. One end of the guide groove 2222 communicates with the center hole 223 of the electrode assembly 22 in the radial direction of the electrode assembly 22, and the other end of the guide groove 2222 penetrates the edge 2223 of the tab part. The guiding groove 2222 can guide the electrolyte of the periphery of the electrode assembly 22 to the central hole 223, or the electrolyte of the central hole 223 can diffuse to the periphery through the guiding groove 2222, which is favorable for the electrode assembly 22 to be fully soaked by the electrolyte, so that the cylindrical battery monomer 20 has good circulation performance and reduces the risk of lithium precipitation of the cylindrical battery monomer 20, and further improves the performance of the cylindrical battery monomer 20.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (18)
- An electrode assembly, comprising:a body portion; andthe lug part is arranged at one end of the body part and provided with a lug end face deviating from the body part;the electrode lug part is provided with a diversion trench which is sunken from the end face of the electrode lug to the direction close to the body part, and the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part.
- The electrode assembly of claim 1, wherein the channels are formed by upsetting the tab end face.
- The electrode assembly of claim 1, wherein the electrode assembly further comprises:and the central hole is formed in the body part, penetrates through the end face of the tab, and is communicated with the guide groove.
- The electrode assembly of claim 3, wherein the flow guide slot extends through an edge of the tab portion in a direction perpendicular to the axis of the central bore and in a direction away from the axis of the central bore.
- The electrode assembly according to claim 3 or 4, wherein the width of the flow guide groove gradually increases in a direction perpendicular to the axis of the center hole and in a direction away from the axis of the center hole.
- The electrode assembly of claim 5, wherein the minimum width of the flow guide groove is less than the aperture of the central bore.
- The electrode assembly of any of claims 3-5, wherein the channels are isopipe.
- The electrode assembly of claim 7, wherein the width of the flow guide groove is greater than the aperture of the central bore.
- The electrode assembly of any one of claims 1-8, wherein a groove sidewall of the flow guide groove is a cambered surface.
- The electrode assembly according to any one of claims 3 to 8, wherein the tab end face is formed with a plurality of the flow guide grooves, the plurality of flow guide grooves being arranged at intervals around the center hole.
- The electrode assembly of claim 10, wherein a plurality of the flow channels are evenly spaced around the central bore.
- A battery cell, comprising:the electrode assembly of any one of claims 1-11;and a housing for accommodating the electrode assembly, the housing having an electrode output portion for connection with the tab end face.
- The battery cell of claim 12, wherein the battery cell further comprises:And the current collecting member is accommodated in the shell, the current collecting member abuts against the end face of the tab, and the current collecting member is connected to the electrode output part.
- The battery cell according to claim 13, wherein the tab end surface is welded with the current collecting member to form a weld extending in a radial direction or a circumferential direction of the electrode assembly at the tab end surface.
- A battery comprising the battery cell according to any one of claims 12-14.
- A powered device comprising the battery of claim 15.
- An apparatus for manufacturing an electrode assembly, comprising:a providing device configured to provide an electrode assembly including a body portion and a tab portion disposed at one end of the body portion, the tab portion having a tab end face disposed away from the body portion;and the upsetting device is configured to upsett the lug end surface so as to form a diversion trench recessed from the lug end surface towards the direction close to the body part at the lug part, and the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part.
- A method of manufacturing an electrode assembly, comprising:Providing an electrode assembly comprising a body portion and a tab portion, the tab portion being disposed at one end of the body portion, the tab portion having a tab end face disposed away from the body portion;and upsetting the lug end surface to form a diversion trench recessed from the lug end surface to a direction close to the body part, wherein the diversion trench is used for guiding electrolyte to diffuse to the periphery of the body part.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/074119 WO2023141840A1 (en) | 2022-01-26 | 2022-01-26 | Electrode assembly, battery cell, battery, and electrical device |
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| CN117083754A true CN117083754A (en) | 2023-11-17 |
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| WO (1) | WO2023141840A1 (en) |
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| CN117134044A (en) * | 2023-08-23 | 2023-11-28 | 东阳利维能新能源科技有限公司 | Lithium ion battery structure |
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| CN205900334U (en) * | 2016-08-05 | 2017-01-18 | 南通绿业中试技术研究院有限公司 | Ultracapacitor system drainage terminal |
| JP2018045846A (en) * | 2016-09-13 | 2018-03-22 | リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフトＬｉｔｈｉｕｍ Ｅｎｅｒｇｙ ａｎｄ Ｐｏｗｅｒ ＧｍｂＨ ＆ Ｃｏ． ＫＧ | Power storage element |
| CN109686590A (en) * | 2019-01-31 | 2019-04-26 | 广东顺德工业设计研究院(广东顺德创新设计研究院) | Supercapacitor and its manufacturing method |
| CN215266481U (en) * | 2021-07-30 | 2021-12-21 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and consumer |
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