CN114050306A - Lithium battery - Google Patents
Lithium battery Download PDFInfo
- Publication number
- CN114050306A CN114050306A CN202111329310.4A CN202111329310A CN114050306A CN 114050306 A CN114050306 A CN 114050306A CN 202111329310 A CN202111329310 A CN 202111329310A CN 114050306 A CN114050306 A CN 114050306A
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- China
- Prior art keywords
- positive
- negative electrode
- negative
- face
- cover plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 31
- 239000011888 foil Substances 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000004898 kneading Methods 0.000 claims description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 6
- 229910001416 lithium ion Inorganic materials 0.000 claims description 6
- 235000015110 jellies Nutrition 0.000 claims 1
- 239000008274 jelly Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical group [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- 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
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of lithium batteries, and discloses a lithium battery, which comprises: the winding core comprises a main body, wherein a positive electrode empty foil area and a negative electrode empty foil area are arranged at two ends of the main body, the positive electrode empty foil area is formed into a positive electrode end face through flattening, and the negative electrode empty foil area is formed into a negative electrode end face through flattening; the positive electrode connecting cover is buckled on the positive electrode end face and is welded and connected with the positive electrode end face; and the negative electrode connecting cover is buckled on the end face of the negative electrode and is welded and connected with the negative electrode connecting cover. The positive electrode connecting cover is buckled on the positive electrode end face and is connected in a welding mode; the negative electrode connecting cover is buckled on the end face of the negative electrode and is connected in a welding mode. The connecting cover is directly welded with the end face of the winding core without a connecting sheet, so that the problem of positioning is avoided; the end face is taken as a reference, so that the positioning is accurate, the contact area is large, and the internal resistance of the battery is effectively reduced; the utilization rate of the internal space of the battery is improved, the overall energy density can be improved under the same volume, or a smaller volume design can be realized under the specified required energy density.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery.
Background
In recent years, lithium ion batteries have been widely used in the fields of power batteries, energy storage batteries, electric tools, and the like because of their advantages of high voltage, large specific energy, long charging and discharging life, stable discharging performance, low self-discharging rate, no pollution, and the like.
According to the number of the tabs, the current lithium ion battery can be mainly divided into a single-tab structure, a double-tab structure, a multi-tab structure and a full-tab structure. For example: 18650 and other small cylindrical batteries mostly adopt a monopolar lug structure and a bipolar lug structure; in the square aluminum-shell battery, a multi-tab structure and a full-tab structure are mostly adopted. At present, the core is wound by a full-lug structure, and the lug is connected with the cover plate by adopting a connecting sheet. However, the connection of the connecting pieces has the problems of poor positioning accuracy and positioning efficiency, low space utilization rate and small contact area.
Therefore, a lithium battery is needed to solve the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lithium battery, which forms an end face by kneading and flattening, and avoids the problems that two ends of a winding core have no reference surface and cannot be positioned when the lithium battery enters a shell; the contact area is large, so that the internal resistance of the battery can be effectively reduced, and the rate discharge capacity of the battery is improved; the inner space that the connection piece occupy has been reduced, has improved the battery inner space, can increase the size of rolling up the core, has improved battery inner space utilization.
In order to achieve the purpose, the invention adopts the following technical scheme:
provided is a lithium battery, including:
the winding core comprises a main body, wherein a positive electrode empty foil area and a negative electrode empty foil area are arranged at two ends of the main body, the positive electrode empty foil area is formed into a positive electrode end face through flattening, and the negative electrode empty foil area is formed into a negative electrode end face through flattening;
the positive electrode connecting cover is buckled on the positive electrode end face and is welded and connected with the positive electrode end face;
and the negative electrode connecting cover is buckled on the end face of the negative electrode and is welded and connected with the negative electrode connecting cover.
As a preferred technical scheme of a lithium cell, the lithium cell still includes anodal apron and negative pole apron, anodal apron with anodal connecting cover welded connection, the negative pole apron with negative pole connecting cover welded connection.
As a preferred technical scheme of the lithium battery, the lithium battery further comprises a battery shell, and the winding core is inserted into the battery shell.
As a preferred technical scheme of the lithium battery, the positive cover plate is located at the positive end of the battery case and plugs the port of the positive end of the battery case;
the negative electrode cover plate is positioned at the negative electrode end of the battery shell and seals the port of the negative electrode end of the battery shell.
As a preferred technical scheme of the lithium battery, the positive electrode cover plate is connected with the battery shell in a welding mode, and the negative electrode cover plate is connected with the battery shell in a welding mode.
As a preferred technical scheme of a lithium battery, the main body comprises a positive current collector, a diaphragm and a negative current collector which are sequentially stacked, the diaphragm isolates a coating area of the positive current collector from a coating area of the negative current collector, and the positive current collector, the diaphragm and the negative current collector are wound into the main body.
As a preferred technical scheme of the lithium battery, the rubbing is carried out by any one, any two or three of ultrasonic vibration, mechanical vibration and mechanical rubbing.
As a preferred technical scheme of the lithium battery, the anode connecting cover and the anode end face and the cathode connecting cover and the cathode end face are connected through ultrasonic welding or laser welding.
As a preferred technical solution of the lithium battery, the positive cover plate and the positive connecting cover, the negative cover plate and the negative connecting cover, the positive cover plate and the battery case, and the negative cover plate and the battery case are all connected by laser welding.
As a preferred technical scheme of the lithium battery, the lithium battery is a square aluminum shell lithium ion battery.
Compared with the prior art, the invention has the following beneficial effects:
the two ends of the winding core are respectively provided with a positive end surface formed by kneading and flattening and a negative end surface formed by kneading and flattening; the positive electrode connecting cover is buckled on the positive electrode end face and is connected in a welding mode; the negative electrode connecting cover is buckled on the end face of the negative electrode and is connected in a welding mode. The end faces are formed by kneading and flattening, so that the problems that no reference surface exists at the two ends of the winding core and the winding core can not be positioned when entering the shell are solved, the contact area is large, the internal resistance of the battery can be effectively reduced, and the rate discharge capacity of the battery is improved; moreover, need not the connection piece, reduced its inner space that occupies, improved battery inner space, can increase the size of rolling up the core, improved battery inner space utilization, can improve whole energy density under equal volume, perhaps realize littleer volume design under the energy density that the regulation required.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery provided by the present invention;
FIG. 2 is a schematic structural diagram of a winding core provided by the present invention;
fig. 3 is a schematic structural diagram of the positive connection cover and the positive cover plate provided by the present invention;
fig. 4 is a schematic structural view of the positive electrode connecting cover provided by the present invention;
fig. 5 is a schematic structural diagram of the positive electrode cover plate provided by the present invention.
Wherein, 1, a roll core; 11. a positive electrode end face; 12. a negative electrode end face; 2. a positive electrode connecting cover; 21. welding the sheet; 3. a negative electrode connecting cover; 4. a positive electrode cover plate; 5. and a negative electrode cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention 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 present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1 to 5, the present embodiment discloses a lithium battery, which includes a winding core 1, a positive electrode connection cover 2, a negative electrode connection cover 3, a positive electrode cover plate 4, a negative electrode cover plate 5, and a battery case.
The winding core 1 is a winding core 1 of a full-lug, the winding core 1 comprises a main body, an anode empty foil area and a cathode empty foil area are arranged at two ends of the main body, the anode empty foil area forms an anode end face 11 through flattening, and the cathode empty foil area forms a cathode end face 12 through flattening.
Specifically, the main part includes positive pole current collector, diaphragm and the negative pole current collector that stacks gradually the setting, and positive pole current collector includes coating district and empty foil district, and negative pole current collector includes coating district and empty foil district. The coating district of anodal mass flow body and the coating district overlap setting of negative current collection body, and the empty foil district of anodal mass flow body and the empty foil district of negative current collection body are located both ends respectively, and anodal mass flow body and negative current collection body dislocation set promptly. The diaphragm isolates the coating area of the positive current collector and the coating area of the negative current collector, and the positive current collector, the diaphragm and the negative current collector are wound into a main body. The cross-sectional shape of the winding core 1 may be circular, elliptical, circular-like or elliptical-like, etc. The hollow foil area is specifically formed into an end face by kneading and flattening through any one, any two or three of ultrasonic vibration, mechanical vibration and mechanical kneading to form the full tab. The positive electrode end surface 11 and the negative electrode end surface 12 have the same shape as the end surface of the winding core 1. The depth of the flattening of the empty foil zone does not exceed the plane of the length of the membrane, i.e. the flattening is only directed at the empty foil zone and cannot flatten the application zone, so as to ensure the quality of the reeling core 1.
The positive electrode connecting cover 2 is in a cover shape and is provided with a welding sheet 21, and the positive electrode connecting cover 2 is buckled on the positive electrode end face 11 and is welded and connected with the positive electrode end face 11. The two are joined in particular by ultrasonic welding or laser welding. The negative electrode connecting cover 3 is in a cover shape and is provided with a welding sheet 21, the negative electrode connecting cover 3 is buckled on the negative electrode end face 12, and the negative electrode connecting cover and the negative electrode end face are connected in a welding mode. The two are joined in particular by ultrasonic welding or laser welding. The positive electrode connection cap 2 and the negative electrode connection cap 3 have the same structure. The shape of the laser welding seal of the end face and the connecting cover comprises a circle, a circular ring, a semicircular ring, a sector, a triangle, a quadrangle, a single straight line, a multiple straight line, an e-shaped shape and a bent line, and can be any one or a plurality of combinations.
The two ends of the winding core 1 are respectively provided with a positive end surface 11 formed by flattening and a negative end surface 12 formed by flattening; the positive electrode connecting cover 2 is buckled on the positive electrode end face 11 and is connected in a welding mode; the negative electrode connecting cover 3 is buckled on the negative electrode end face 12 and is connected in a welding mode. The end face is formed by kneading, so that the problem that the two ends of the winding core have no reference surface and cannot be positioned when entering the shell is avoided. Moreover, the contact area is large, so that the internal resistance of the battery can be effectively reduced, and the rate discharge capacity of the battery is improved; moreover, need not the connection piece, reduced its inner space that occupies, improved the battery inner space, can increase the size of rolling up core 1, improved battery inner space utilization, can improve whole energy density under equal volume, perhaps realize littleer volume design under the energy density that the regulation required.
The positive cover plate 4 is welded to the positive connection cover 2, in particular, the positive cover plate 4 is welded to the welding tab 21 of the positive connection cover 2, in particular by laser welding. The negative electrode cover plate 5 is welded to the negative electrode connecting cover 3, and specifically, the negative electrode cover plate 5 is welded to the welding tab 21 of the negative electrode connecting cover 3, specifically, by laser welding.
The core 1 is inserted in the battery case, specifically, the number of the core 1 in the battery case can be one, and also can be a plurality of combinations, and the assembly is specifically carried out according to the design requirement.
The positive electrode cover plate 4 is positioned at the positive electrode end of the battery case and seals the port of the positive electrode end of the battery case, the shape of the positive electrode cover plate 4 is the same as that of the port of the battery case, the periphery of the positive electrode cover plate 4 is covered with the periphery of the port of the positive electrode end of the battery case, and then the periphery of the positive electrode cover plate 4 is welded. Specifically, the positive electrode lid plate 4 and the battery case are connected by laser welding.
The negative electrode cover plate 5 is positioned at the negative electrode end of the battery shell and seals the port of the negative electrode end of the battery shell. The shape of the negative electrode cover plate 5 is the same as that of the port of the battery case, the periphery of the negative electrode cover plate 5 is covered with the periphery of the port of the negative electrode end of the battery case, and then the negative electrode cover plate 5 is closed by welding, and the peripheries of the negative electrode cover plate 5 are all welded. Specifically, the negative electrode lid plate 5 and the battery can are connected by laser welding.
The winding core 1 is a lithium ion battery winding core 1, and the battery shell is a square aluminum shell, namely the lithium battery is a square aluminum shell lithium ion battery.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A lithium battery, comprising:
the winding core (1) of the full-lug comprises a main body, wherein a positive electrode empty foil area and a negative electrode empty foil area are arranged at two ends of the main body, the positive electrode empty foil area is formed into a positive electrode end face (11) through flattening, and the negative electrode empty foil area is formed into a negative electrode end face (12) through flattening;
the positive electrode connecting cover (2) is buckled on the positive electrode end surface (11) and is welded and connected with the positive electrode end surface;
and the negative electrode connecting cover (3) is buckled on the negative electrode end surface (12) and is connected with the negative electrode end surface in a welding way.
2. Lithium battery according to claim 1, characterized in that it further comprises a positive cover plate (4) and a negative cover plate (5), the positive cover plate (4) being welded to the positive connection cover (2) and the negative cover plate (5) being welded to the negative connection cover (3).
3. The lithium battery according to claim 2, characterized in that it further comprises a battery case in which the jelly roll (1) is inserted.
4. A lithium battery according to claim 3, characterized in that the positive cover plate (4) is located at the positive terminal of the battery case and blocks the port of the positive terminal of the battery case;
the negative electrode cover plate (5) is positioned at the negative electrode end of the battery shell and seals the port of the negative electrode end of the battery shell.
5. The lithium battery according to claim 4, wherein the positive electrode cover plate (4) is welded to the battery case, and the negative electrode cover plate (5) is welded to the battery case.
6. The lithium battery of claim 1, wherein the body comprises a positive current collector, a separator and a negative current collector, which are sequentially stacked, the separator separates the positive current collector coating area from the negative current collector coating area, and the positive current collector, the separator and the negative current collector are wound into the body.
7. The lithium battery of claim 1, wherein the flattening is performed by any one, any two combinations, or three combinations of three of ultrasonic vibration, mechanical vibration, and mechanical kneading.
8. A lithium battery as claimed in claim 1, characterized in that the connection between the positive connection cover (2) and the positive end face (11) and between the negative connection cover (3) and the negative end face (12) is by means of ultrasonic welding or laser welding.
9. Lithium battery according to claim 5, characterized in that the positive cover plate (4) and the positive connecting cover (2), the negative cover plate (5) and the negative connecting cover (3), the positive cover plate (4) and the battery case and the negative cover plate (5) and the battery case are connected by laser welding.
10. The lithium battery of claim 3, wherein the lithium battery is a prismatic aluminum-shell lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329310.4A CN114050306A (en) | 2021-11-10 | 2021-11-10 | Lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329310.4A CN114050306A (en) | 2021-11-10 | 2021-11-10 | Lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114050306A true CN114050306A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111329310.4A Pending CN114050306A (en) | 2021-11-10 | 2021-11-10 | Lithium battery |
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| Country | Link |
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| CN (1) | CN114050306A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108550896A (en) * | 2018-05-29 | 2018-09-18 | 江苏海基新能源股份有限公司 | A kind of full lug coiling column lithium ion battery assembly method |
-
2021
- 2021-11-10 CN CN202111329310.4A patent/CN114050306A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108550896A (en) * | 2018-05-29 | 2018-09-18 | 江苏海基新能源股份有限公司 | A kind of full lug coiling column lithium ion battery assembly method |
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Application publication date: 20220215 |
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