CN115101899A - Naked battery cell, manufacturing method of naked battery cell and battery cell structure - Google Patents
Naked battery cell, manufacturing method of naked battery cell and battery cell structure Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 128
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 10
- 238000005493 welding type Methods 0.000 claims description 10
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- 241000251468 Actinopterygii Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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- Chemical Kinetics & Catalysis (AREA)
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a naked electric core, a manufacturing method of the naked electric core and an electric core structure, wherein the naked electric core comprises: a winding core including a central axis; the tabs are arranged at the axial end part of the winding core and are distributed at intervals along the circumferential direction of the winding core, wherein the heights of the tabs arranged along the radial direction of the winding core are gradually changed, so that the tabs are folded towards one side far away from the central shaft; the current collecting disc is arranged at the axial end part of the winding core, a tab collecting area is formed on the current collecting disc, and the tab is collected in the tab collecting area and connected with the current collecting disc. In the embodiment of the invention, the collecting process is adopted for the pole lugs to replace the flattening process, the pole lugs are collected without generating fragments, the risk of internal short circuit caused by the fragments entering the interior of the battery cell is avoided, and the safety performance of the battery cell is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a naked battery cell, a manufacturing method of the naked battery cell and a battery cell structure.
Background
In recent years, new energy lithium batteries are rapidly developed, and power batteries for new energy automobiles are gradually developed towards high energy density, high rate performance and high safety performance, wherein a full-lug cylindrical battery cell is typical of the high energy density and the high rate performance.
In the present full utmost point ear cylinder electricity core manufacture craft, need rub flat earlier to the utmost point ear of electric core, lead to the cylinder electricity core to have following problem at least:
the cuttings that the flat production was rubbed to full utmost point ear cylinder electric core utmost point ear if fall into roll up the core inside, have and cause the internal short circuit risk.
Disclosure of Invention
The invention mainly aims to provide a naked electric core, a manufacturing method of the naked electric core and an electric core structure, and aims to save a lug flattening process in the electric core manufacturing process so as to solve the problem caused by the flattening process.
In order to solve the above problems, the present invention provides a bare cell, which includes:
a winding core including a central axis;
the tabs are arranged at the axial end part of the winding core and are distributed at intervals along the circumferential direction of the winding core, wherein the heights of the tabs arranged along the radial direction of the winding core are gradually changed, so that the tabs are folded towards one side far away from the central shaft;
the current collecting disc is installed at the axial end part of the winding core, a tab collecting area is formed on the current collecting disc, and the tab is collected in the tab collecting area and connected with the current collecting disc.
Optionally, a first position is included between the inner ring and the outer ring of the winding core, the height of the tab between the inner ring and the first position is gradually reduced, and the height of the tab between the first position and the outer ring is gradually increased, so that the tab is folded towards the first position.
Optionally, the current collecting plate is sequentially formed with a first furling portion, a connecting portion and a second furling portion along a radial direction, the first furling portion and the second furling portion are bent along a same side of the connecting portion, the first furling portion, the connecting portion and the second furling portion enclose the tab furling area, and the connecting portion is arranged corresponding to the first position.
Optionally, the length of the connecting portion in the radial direction is the same as the length of the connecting end surface of the tab after being gathered in the radial direction.
Optionally, the height difference between the maximum height and the minimum height of the tab is determined according to the difference between the radius of the winding core and the radius of the central shaft and one half of the length of the connecting part in the radial direction.
Optionally, the bending length of the first furling part is the same as that of the second furling part, the bending length of the first furling part is smaller than the maximum height of the tab of the inner ring, and the bending length of the second furling part is smaller than the maximum height of the tab of the outer ring.
Optionally, the first furling part and the second furling part are provided with an insulating layer at one end far away from the connecting part.
Optionally, a compressing member is arranged on the connecting portion, and the compressing member is arranged in a gap between two circumferentially adjacent tabs.
Optionally, a plurality of connection points are arranged on the connection portion, and the connection points are distributed along the circumferential direction of the collecting plate.
Optionally, the tabs include a positive tab and a negative tab, and the positive tab and the negative tab are respectively located at two axial ends of the winding core;
the current collecting disc comprises a positive current collecting disc and a negative current collecting disc, the positive current collecting disc is installed on the winding core and provided with the axial end part of the positive lug, and the negative current collecting disc is installed on the winding core and provided with the axial end part of the negative lug.
Optionally, the positive current collecting plate further comprises a positive pole connecting part, and the positive pole connecting part is arranged at the center of the positive current collecting plate; and/or, the anode current collecting disc further comprises a through hole, and the through hole is formed in the center of the anode current collecting disc.
The present invention also provides a cell structure, including:
a housing provided with a pole bore;
the positive pole assembly is arranged in the shell and partially penetrates through the pole hole to extend out of the shell;
and as above naked electric core, naked electric core is installed in the casing, the positive pole current collector disc of naked electric core with positive pole column module connects.
Optionally, the positive pole subassembly includes the positive pole, the one end of positive pole is passed the utmost point post hole extends to outside the casing, the other end of positive pole with the positive pole connecting portion of positive pole current collector dish are connected.
The invention also provides a manufacturing method of the naked electric core, which comprises the following steps:
providing a winding core, wherein a plurality of tabs are arranged at the axial end part of the winding core, the tabs are distributed at intervals along the circumferential direction of the winding core, and the height of the tabs arranged along the radial direction of the winding core is gradually changed;
a current collecting disc is arranged at the axial end part of the winding core, and a tab collecting area of the current collecting disc collects the tabs at the axial end part of the winding core into the tab collecting area under the action of an installation force;
and connecting the lug with the current collecting disc in a preset mode.
Optionally, the preset manner includes welding, and the step of connecting the tab and the current collecting disc in the preset manner includes:
and welding the pole lug and the current collecting plate by adopting a preset welding type, wherein the welding type comprises at least one of a single-welding-point form and a multi-welding-point form, and the welding type is determined according to the length of a connecting part of the current collecting plate.
Optionally, the axial tip installation current collecting disc of rolling up the core, current collecting disc's utmost point ear draws in the district and will under the installation effort the utmost point ear of the axial tip of rolling up the core draws in the utmost point ear step in drawing in the district includes:
aligning a tab gathering area of a current collecting disc with the position of a tab at one axial end of the winding core, or aligning the central position of the current collecting disc with the central shaft of the winding core;
aligning a pressing piece on the current collecting disc with a gap between two circumferentially adjacent tabs on the winding core;
and applying an installation acting force towards the axial end part on the current collecting disc so as to collect the tab into the tab collecting area.
In order to achieve the above object, the present invention provides a bare cell, a method for manufacturing the bare cell, and a cell structure, in this embodiment, the bare cell includes a winding core and a current collecting disc, the height of a tab on the winding core gradually changes along the radial direction of the winding core, a tab collecting area is arranged on the corresponding current collecting disc, the current collecting disc is mounted at the axial end of the winding core, the tab on the winding core is bent from one side with a high height to one side with a low height under the action of the tab collecting area, and is collected in the tab collecting area, and then is connected with the current collecting disc in the tab collecting area. That is, the tab in this embodiment adopts the drawing process instead of the flattening process, and the tab is drawn without generating debris, so that the risk of internal short circuit caused by the debris entering the inside of the battery cell is avoided, and the safety performance of the battery cell is improved.
Drawings
Fig. 1 is a cross-sectional view of a bare cell provided by the present invention;
FIG. 2 is an enlarged schematic view of B in FIG. 1;
FIG. 3 is an enlarged view of the structure at C in FIG. 1;
FIG. 4 is a schematic structural view of a winding core provided by the present invention;
FIG. 5 is a cross-sectional view of a winding core provided by the present invention and an enlarged structure at C;
fig. 6 is a schematic structural diagram of a tab on a winding core provided by the invention after die cutting;
fig. 7 is a cross sectional view after die cutting of a tab on a winding core provided by the invention and an enlarged structural schematic diagram at B in the drawing;
fig. 8 is a schematic structural view of a positive current collecting plate according to the present invention;
fig. 9 is a cross-sectional view of a positive current collecting plate provided by the present invention;
FIG. 10 is an enlarged view of the structure at B in FIG. 9;
fig. 11 is a schematic structural view of an anode current collecting plate according to the present invention;
fig. 12 is a sectional view of an anode current collecting disk according to the present invention;
FIG. 13 is an enlarged view of the structure at B in FIG. 12;
fig. 14 is a schematic view of an installation structure of a positive electrode column assembly and a housing of a cell structure provided by the invention;
fig. 15 is a schematic view structure diagram of a cell structure provided in the present invention;
fig. 16 is an exploded view of a cell structure provided by the present invention;
fig. 17 is an exploded view of a housing and a positive electrode pillar assembly in a cell structure according to the present invention;
fig. 18 is a schematic structural diagram of a bare cell provided in the present invention;
FIG. 19 is an enlarged view of the structure of FIG. 18 at D;
fig. 20 is a schematic flow chart of a method for manufacturing a bare cell according to the present invention.
Labeling and description:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Based on the correlation technique, the manufacturing process of the full-lug cylindrical battery cell comprises a lug flattening process of the battery cell, and the flattening process causes the following problems of the full-lug battery: if powder scraps generated by flattening the lugs of the cylindrical battery cell with the full lugs fall into the winding core, the risk of internal short circuit is caused; after the lug is rubbed flat, the end surface flatness pole difference current collecting disc and the lug are easy to generate fire explosion to cause insufficient welding when being welded; in order to avoid the phenomenon that the lugs are flatly rubbed to shield the central hole of the winding core, the liquid injection efficiency is reduced, the lugs of the inner ring of the winding core can be cut off normally, and the design of real full lugs is not realized.
Based on this, the embodiment of the present invention provides a battery cell without a tab flattening process, so as to solve the above problems.
For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1 to 5, an embodiment of the present invention provides a bare cell, where the bare cell includes a winding core, a tab, and a current collecting tray.
Alternatively, the winding core 21 includes a central axis around which the winding core 21 is wound.
A plurality of the tabs 201, the tabs 201 are disposed at the axial end of the winding core 21, and the tabs 201 are distributed at intervals along the circumferential direction of the winding core 21. Optionally, if roll up core 21 and include the multilayer, then utmost point ear 201 also is provided with the multilayer, and adjacent two that distribute along the circumference of rolling up core 21 the clearance of utmost point ear 201 is in roll up the radial formation gap of core 21, utmost point ear 201 interval sets up, for utmost point ear 201 draws in and reserves the space of drawing in, is convenient for with utmost point ear 201 buckles and draws in, and the fold can not appear.
Alternatively, in the present embodiment, the height of the tab 201 arranged in the radial direction of the winding core 21 is gradually increased, such as gradually increased height, or gradually decreased height, or gradually increased height and then gradually decreased height, or gradually decreased height and then gradually increased height. Because the height of the tab 201 is different, the tab 201 can be bent towards the side with the lower height under the action of force. If the tab 201 is arranged at any position from the central shaft of the winding core 21 to the outer ring of the winding core 21, the tab 201 is lower than tabs 201 at other positions, so that the tab 201 can be folded towards one side far away from the central shaft when stressed.
The current collecting disc 202 is arranged at the axial end part of the winding core 21, the current collecting disc 202 is provided with a tab 201 gathering area, and the current collecting disc 202 is installed on the winding core 21 and gathers the tab 201 in the tab 201 gathering area. Optionally, the tab 201 is connected to the current collecting disc 202 after being gathered to the gathering area of the tab 201. Optionally, the means of attachment includes, but is not limited to, welding.
Optionally, the tabs 201 are divided into positive tabs 201 and negative tabs 201, and the positive tabs 201 and the negative tabs 201 are respectively located at two ends of the winding core 21 in the axial direction. Alternatively, the structures of the positive electrode tab 201 and the negative electrode tab 201 are the same, so the present embodiment takes the tab 201 as an example to illustrate the structures of the positive electrode tab 201 and the negative electrode tab 201.
Referring to fig. 4 to 6, the tabs 201 are disposed along the circumferential direction of the winding core 21, and the tabs 201 on the winding core 21 on each layer of winding core 21 include 6 tabs 201, and 6 tabs 201 are disposed at intervals, so that 6 gaps are formed between the tabs 201 on each layer of winding core 21. Since the winding core 21 includes a plurality of layers, and the plurality of winding cores 21 are arranged from the central axis to the outer ring, a plurality of tabs 201 are radially distributed on the winding core 21. The height of the tabs 201 distributed along the radial direction is gradually changed, including but not limited to the following:
in an alternative embodiment, a first position is included between the inner ring and the outer ring of the winding core 21, the height of the tab 201 gradually decreases from the inner ring to the first position, and the height of the tab 201 gradually increases from the first position to the outer ring, so that the tab 201 is folded toward the first position. That is, along the radial direction of the winding core 21, the heights of the tabs 201 are distributed in a V shape. Based on the utmost point ear 201 height on the first position is lower, and first position top has the accommodation space, just utmost point ear 201 receives the external application toward during the effort of first position, utmost point ear 201 on inner circle and the outer lane toward the accommodation space of first position top is buckled, in first position top forms the joining end face after drawing in for weld with current collecting disc 202. In this way, the tab 201 can omit the flattening process. Alternatively, both the inner ring and the outer ring of the winding core 21 are centered on the central axis, and the first position may be an intermediate position between the inner ring and the outer ring, or may be any position.
In another alternative embodiment, at least two first positions are included between the inner ring and the outer ring of the winding core 21, so that the heights of the tabs 201 are distributed in a W shape along the radial direction of the winding core 21.
In yet another alternative embodiment, at least three first positions are included between the inner ring and the outer ring of the winding core 21, so that the heights of the tabs 201 are distributed in an "M" shape along the radial direction of the winding core 21.
It can be understood that the height of the tab 201 gradually changes along the radial direction of the winding core 21, when the tab 201 is acted by force, the tab 201 with a low height is folded, and the tab 201 is folded to form a connecting end surface for being connected with the current collecting disc 202. Optionally, the assembly and welding process of the tab 201 and the current collecting disc 202 is described below by taking the example that the heights of the tab 201 are distributed in a V shape along the radial direction of the winding core 21.
Alternatively, the tab 201 may be folded by applying a force manually or by applying a force by a mechanical device. When the current collecting disc 202 is installed, the collected tab 201 is located in a tab 201 collecting area of the current collecting disc 202, and the tab 201 and the current collecting disc 202 are connected in the tab 201 collecting area.
Or alternatively, the tabs 201 can be folded directly when being installed on the basis of the current collecting disc 202. If the tab 201 can be folded in the folding area of the tab 201 of the current collecting disc 202 under the action of the current collecting disc 202, and a connection end surface is formed at the top of the folding area of the tab 201, and based on the current collecting disc 202, the connection end surface formed after folding in can be flush, so that the phenomenon of fire explosion caused by welding the connection end surface and the current collecting disc 202 can be avoided, and the occurrence of cold joint can be avoided.
Optionally, the current collecting plate 202 structure in this embodiment is as shown in fig. 8-13, the current collecting plate 202 is formed with first folded part 2011, connecting part 1013 and second folded part 2012 along radial direction in proper order, first folded part 2011 with second folded part 2012 is followed the same lateral bending setting of connecting part 1013, first folded part 2011 connecting part 1013 with second folded part 2012 encloses synthetically utmost point ear 201 folds the district, wherein, connecting part 1013 with first position corresponds the setting.
Optionally, the collecting tray 202 includes a central position abutting against the central shaft of the winding core 21, and the first collecting part 2011, the connecting part 1013, and the second collecting part 2012 are sequentially arranged from the central position to the outer ring. The gap between the end of the first furling part 2011 far away from the connecting part 1013 and the end of the second furling part 2012 far away from the connecting part 1013 is greater than the length of the connecting part 1013 in the radial direction, so that the furling area of the tab 201 formed by the first furling part 2011, the connecting part 1013 and the second furling part 2012 is a furling space gradually decreasing from the furling opening to the connecting part 1013. Current collecting disc 202 is installed when rolling up on core 21, first portion 2011 of drawing in with the second portion 2012 of drawing in applies to the utmost point ear 201 that rolls up on core 21 outer lane and the inner circle and extremely the power that connecting portion 1013 draw in makes utmost point ear 201 down first position is buckled, and in connecting portion 1013 effect down forms the connection terminal surface. Alternatively, the tab 201 and the collecting plate 202 are connected to the connecting portion 1013 via the connecting end surface.
Optionally, the first gathering part 2011 is used for gathering the tab 201 between the inner ring and the first position to the first position; the second gathering part 2012 is used for gathering the tab 201 from the outer ring to the first position toward the first position.
In this embodiment, naked electric core 2 is including rolling up core 21 and current collecting disc 202, highly following of utmost point ear 201 on rolling up core 21 the radial gradual change setting of rolling up core 21 sets up utmost point ear 201 on the current collecting disc 202 that corresponds and draws in the district, installs current collecting disc 202 the in-process of the axial tip of rolling up core 21 under utmost point ear 201 draws in the effect in district, extremely ear 201 on rolling up core 21 draws in from the high one side toward the high lateral buckling who hangs down, draws in utmost point ear 201 draws in the district, then utmost point ear 201 draw in the district with current collecting disc 202 connects. That is, the tab 201 in this embodiment adopts the furling process instead of the flattening process, and the tab 201 is furled without generating debris, thereby avoiding the risk of internal short circuit caused by the debris entering the inside of the battery cell, and improving the safety performance of the battery cell.
Optionally, the height of the tab 201 at the first position is set to H1 (i.e., the minimum height of the tab 201). Optionally, the height of all the tabs 201 after being folded is also H1 (the height of the tabs 201 after being folded can be controlled at H1 by reasonably setting the heights of the tabs 201 at the outer ring and the inner ring and the gap between the current collecting disc 202 and the axial end of the winding core 21). That is, except the tab 201 located at the first position, the tab 201 at other positions has the same folded height as the tab 201 at the first position, so that all the tabs 201 folded are equal in height, and the tab 201 cannot be extruded unevenly, and all the tabs 201 can be electrically connected with the current collecting disc 202.
So, this embodiment draws in the mode that district draws in the utmost point ear 201 that will roll up core 21 through the utmost point ear 201 of current collecting disc 202, can be so that the terminal surface parallel and level of connection of the utmost point ear 201 after drawing in, and all utmost point ears 201 all realize the electricity with current collecting disc 202 and are connected, increase overcurrent capacity, reduce the internal resistance, reduce electric core and generate heat, and the utmost point ear 201 of inner circle need not to tailor, realizes real full utmost point ear 201, has improved the multiplying power performance of full utmost point ear 201 electric core.
Optionally, the connection part 1013 is a welded part of the collecting plate 202. The length of the connecting part 1013 in the radial direction of the current collecting plate 202 is the same as the length of the connecting end face of the tab 201 in the radial direction. If the size of the connection end surface of the tab 201 is set, the length of the connection part 1013 of the current collecting disk 202 in the radial direction can be determined according to the size of the connection end surface. Then, the first tapered portion 2011 and the second tapered portion 2012 are distributed from both radial ends of the connecting portion 1013. Thus, the tab 201 is formed in a gathered region. Optionally, because utmost point ear 201 is through the district is drawn in to utmost point ear 201 of current collecting disc 202, consequently the size of the joining end face after utmost point ear 201 draws in with the connecting portion 1013 of current collecting disc 202 is always, utmost point ear 201 the angle of buckling with first portion 2011 of drawing in with the inclination that the portion 2012 was drawn in to the second is unanimous, consequently can be through the structural arrangement who changes current collecting disc 202, but the adaptation preparation different grade type electric core realizes the diversification of electric core type, and realizes simple structure.
Alternatively, in order to ensure that the height of the tab 201 of the outer ring or the inner ring after being folded is the same as the height of the tab 201 in the first position, the height difference between the maximum height and the minimum height of the tab 201 in this embodiment is determined according to the difference between the radius of the winding core 21 and the radius of the central shaft and one half of the length of the connecting part 1013 in the radial direction. In one embodiment, the maximum height of the tab 201 is the maximum height of the tab 201 of the outer ring and/or the inner ring, and the minimum height of the tab 201 is the height of the tab 201 in the first position.
Optionally, the maximum height of the tab 201 (the maximum height of the tab 201 in the outer ring, or the maximum height of the tab 201 in the inner ring) and the minimum height of the tab 201 (e.g., the height of the tab 201 in the first position) satisfy the following relationship:
where, Φ a is the diameter of the winding core 21, Φ b is the diameter of the central axis of the winding core 21, Lc1 is the length of the connecting part 1013 in the radial direction, H1 is the minimum height of the tab 201 (e.g., the height of the tab 201 at the first position), and Hn is the maximum height of the tab 201 (e.g., the maximum height of the tab 201 at the outer or inner ring of the winding core 21).
Optionally, in some embodiments, 2mm ≦ H1 ≦ 5mm, 20mm ≦ φ a ≦ 80mm, 3mm ≦ φ b ≦ 15mm, 1mm ≦ Lc1 ≦ 5mm, 1 ≦ s ≦ 3, 1 ≦ t ≦ 3, and 1 ≦ m ≦ 3.
Optionally, in some embodiments, t is 1, that is, the difference between the maximum height and the minimum height of the tab 201 is equal to the difference between the radius of the winding core 21 and the radius of the central axis and the length of the connecting portion 1013 in the radial direction, so that after the diameter of the winding core 21, the diameter of the central axis and the length of the connecting portion 1013 in the radial direction are determined, the difference between the maximum height and the minimum height of the tab 201 can be calculated, and the maximum height and the minimum height of the tab 201 can be determined.
In this embodiment, when the heights of the tabs 201 and the length of the connecting portion 1013 of the current collecting disc 202 in the radial direction satisfy a certain relationship, all the tabs 201 can be flush after the tabs 201 are folded, and can be electrically connected to the current collecting disc 202, so as to improve the flatness of the connecting end surface after the tabs 201 are folded, improve the connection rate with the current collecting disc 202, and improve the safety performance of the battery cell.
Optionally, based on the height symmetry of the tabs 201 of the inner ring and the outer ring, the folding length LC3 of the first folded part 2011 and the folding length LC2 of the second folded part 2012 of the current collecting plate 202 are set to be the same, so as to ensure that the tabs 201 of the inner ring and the outer ring are aligned toward the center of the first position.
Optionally, in order to avoid the first portion 2011 and the second portion 2012 that draws in of current collecting plate 202 deviates from the one end fish tail of connecting portion 1013 the utmost point ear 201 avoids interior short circuit problem, sets up the length of buckling of first portion 2011 that draws in is less than the utmost point ear 201's of inner circle maximum height, the length of buckling of second portion 2012 that draws in is less than the maximum height of the utmost point ear 201 of outer lane. Optionally, one end of the first drawn part 2011, which is far away from the connecting part 1013, is provided with an arc surface or a folded edge, so as to prevent the end surface of the first drawn part 2011 from directly contacting the tab 201, thereby protecting the integrity of the tab 201.
Optionally, an insulating layer 2016 is disposed on each of the first furled part 2011 and one end of the second furled part 2012 far away from the connecting part 1013. Optionally, the insulating layer 2016 is configured to isolate the battery cell from a casing disposed around the battery cell.
Optionally, the insulating layer 2016 is a ceramic plating.
Optionally, a pressing piece 2014 is arranged on the connecting portion 1013, and the pressing piece 2014 is installed in a gap between two circumferentially adjacent tabs 201. The tabs 201 are arranged along the circumferential direction of the winding core 21 at intervals, and a gap is formed between two circumferentially adjacent tabs 201, and the gaps between the tabs 201 can be the same (if the tabs 201 are uniformly distributed in the circumferential direction of the winding core 21). In order to make the atress of each utmost point ear 201 even for can draw in along fixed direction when drawing in utmost point ear 201, make the density after drawing in utmost point ear 201 is even set up on the connecting portion 1013 of current collecting disc 202 compress tightly piece 2014, current collecting disc 202 is installed when rolling up on core 21, compress tightly the clearance between two utmost point ears 201 that 2014 alignment axial is adjacent, compress tightly piece 2014 to utmost point ear 201 applys guiding force.
Optionally, the pressing element 2014 is a pressing strip, a slit is formed in the tab 201 of the winding core 21 along the radial direction, and the pressing strip corresponds to the slit of the winding core 21 one by one.
Optionally, the height H1 of the tab 201 after being collected is greater than the gap between the connecting portion 1013 and the axial end of the winding core 21 after being mounted on the axial end of the winding core 21, so that the tab 201 after being collected abuts against the connecting portion 1013 of the current collecting disc 202, and the electrical connection stability of the tab 201 and the current collecting disc 202 is increased.
Optionally, a plurality of connection points 2018 are disposed on the connection portion 1013, and the connection points 2018 are distributed along the circumferential direction of the collecting plate 202. The connecting part 1013 is the welding area of the tab 201, and the welding machine area is provided with the connecting point 2018 (welding point), so that the problem that the diaphragm is burnt through by laser leakage is effectively avoided.
Optionally, when the length of the connecting portion 1013 in the radial direction is Lc1 or less than 1.5mm, the connecting points 2018 take a single-welding-point form, an included angle between the laser direction and the current collecting plate 202 is less than 90 °, all the connecting points 2018 define a circular line, when the length of the connecting portion 1013 in the radial direction is 1.5mm or more and Lc1 or more than 5mm, the connecting points 2018 take a multi-welding-point form, and all the connecting points 2018 define a plurality of circular lines with increasing diameters.
Optionally, referring to fig. 8 and 11, the current collecting disc 202 includes a positive current collecting disc 2021 and an negative current collecting disc 2022, the positive current collecting disc 202 is mounted on the axial end portion of the winding core 21 where the positive tab 201 is disposed, and the negative current collecting disc 2022 is mounted on the axial end portion of the winding core 21 where the negative tab 201 is disposed.
Optionally, the first furled part 2011, the connecting part 1013 and the second furled part 2012 of the positive electrode current collecting disc 2021 and the negative electrode current collecting disc 2022 are the same, and the furled angles of the first furled part 2011 and the second furled part 2012 are the same. In contrast, the positive current collecting plate 2021 needs to be connected to the positive post 1011, while the negative current collecting plate 2022 is connected to the case. Based on this, the positive current collecting plate 2021 includes a positive electrode column connecting portion 2015, the positive electrode column connecting portion 2015 is disposed at a central position of the positive current collecting plate 2021, and the positive electrode column connecting portion 2015 is used for being connected with the positive electrode column assembly 101 of the battery cell. The negative current collecting plate 2022 further comprises a through hole 2017, the through hole 2017 is formed in the center of the negative current collecting plate 2022, and the through hole 2017 is used for being connected with the casing 102 of the battery cell.
Optionally, the thickness of the connecting portion 1013 of the positive current collecting disk 2021 is 0.2mm-2.0mm, the thickness of the connecting portion 1013 of the negative current collecting disk 2022 is 0.2mm-1.5mm, and the material is nickel-plated on the surface of copper.
Optionally, the diameter of the connection points 2018 (welding points) of the positive current collecting disc 2021 is 0.5mm to 1.5mm, and the distance between the outer contours of the connection points 2018 is 0.2mm to 1.0 mm. The diameter of the connection point 2018 of the anode current collecting disc 2022 is 0.5mm-1.5mm, and the distance between the outer contours of the connection points 2018 is 0.2mm-1.0 mm.
Optionally, referring to fig. 13, the angle of the second folded part is θ c2, which is equal to the angle θ c3 of the first folded part, and the angle of the first folded part and the angle of the second folded part are equal to the folded angle.
Referring to fig. 14 to 17, the present invention further provides a cell structure, where the cell structure includes:
a housing provided with a pole bore;
a positive pole assembly 101, wherein the positive pole assembly 101 is arranged in the shell and partially penetrates through the pole hole to extend out of the shell;
and naked electric core 2 as above, naked electric core 2 installs in the casing, naked electric core 2's current collector 202 with positive pole post subassembly 101 is connected.
Optionally, bare cell 2 is bare cell 2 as described in each of the above embodiments.
The positive pole assembly 101 and the bare cell 2 are both arranged in the shell, and the positive pole assembly 101 is electrically connected with the current collecting disc 202 of the bare cell 2; the current collecting disc 202 of the bare cell 2 is electrically connected with the shell.
Optionally, the housing is a steel shell, and the current collecting plate 202 is welded to the housing.
Optionally, the positive pole assembly 101 includes a positive pole 1011, one end of the positive pole 1011 passes through the pole hole and extends to outside the housing, the other end of the positive pole 1011 with the positive pole connecting portion 2015 of the current collecting plate 202 is connected. Optionally, the positive post 1011 is welded to the positive post connection 2015.
Optionally, referring to fig. 18 and fig. 19, the positive electrode pillar assembly 101 includes a positive electrode pillar 1011, an outer insulator 1012, a sealing ring 1013, an inner insulator 1014 and an insulating ring 1015, the sealing ring 1013 is disposed between the positive electrode pillar 1011 and the housing to achieve a sealing effect, the outer insulator 1012 is disposed between the positive electrode pillar 1011 and the housing to achieve an insulating supporting effect, the inner insulator 1014 is disposed between the positive electrode pillar 1011 and the housing to achieve an insulating supporting effect, and the insulating ring 1015 is disposed on an inner surface of the housing to achieve an insulating effect.
Optionally, the battery cell structure further includes a cap 5 and a sealing element 6, the cap 5 is connected to the housing in a covering manner, and covers one end connected to the current collecting plate 202, the cap 5 is provided with an explosion-proof valve 7, the sealing element 6 is welded at the central position of the cap 5, the cap 5 is welded and fixed to the housing, the sealing element 6 is welded and fixed to the cap 5, the explosion-proof valve 7 is arranged on the cap 5, a scribing process is adopted, and the remaining thickness is 0.05-0.1 mm.
The above-mentioned naked electric core 2 of this embodiment electricity core structure adoption, consequently the electricity core structure possesses all beneficial effects that above-mentioned naked electric core 2 possessed.
Optionally, referring to fig. 20, in an embodiment of the present invention, a method for manufacturing a bare cell is provided based on the bare cell, where the method for manufacturing the bare cell includes the following steps:
step S100, providing a winding core, wherein a plurality of tabs are arranged at the axial end part of the winding core, are distributed at intervals along the circumferential direction of the winding core, and gradually change the heights of the tabs arranged along the radial direction of the winding core;
step S200, a current collecting disc is installed at the axial end part of the winding core, and a tab collecting area of the current collecting disc collects the tabs at the axial end part of the winding core into the tab collecting area under the installation acting force;
and step S300, connecting the lug with the current collecting disc in a preset mode.
Optionally, before step S100, the core is die-cut by using laser, the tab is slit and divided into a plurality of tabs, so that the tabs are uniformly distributed along the axial direction of the core at intervals (optionally, the tabs are die-cut into 6 slits, and the slits are uniformly distributed along the circumferential direction of the core).
Optionally, the winding core forms a winding core based on a winding core process, and the full tab is arranged along the circumferential direction of the winding core. And forming a plurality of lugs distributed at intervals by the laser die cutting. Optionally, the tab is cut so that the height of the tab arranged along the radial direction of the winding core is gradually changed. Optionally, the height of the tab can be gradually changed in a V shape or gradually changed in a W/M shape.
Optionally, in order to avoid the powder falling into the winding core during die cutting, the winding core is subjected to a slitting mode, and the die cutting position relationship is set such that the laser is located at the lower part and the winding core is located at the upper part, that is, the powder cannot fall into the winding core under the action of gravity after die cutting.
The core that will be based on after the aforesaid is handled is fixed a position between two parties, and CCD discernment rolls up core central hole and puts, then the axial tip installation current collecting disc of rolling up the core, current collecting disc's utmost point ear draw in the district will under the installation effort the utmost point ear of the axial tip of rolling up the core draws in the district to utmost point ear. And then welding the current collecting disc and the tabs.
Optionally, the current collecting disks include a positive current collecting disk 2021 and an negative current collecting disk. In some embodiments, the positive current collecting disk 2021 and the negative current collecting disk may be positioned at axial ends of the roll core and then welded. Or in some embodiments, the positive current collecting disc 2021 is positioned at the axial end of the winding core, the positive current collecting disc 2021 and the positive tab are welded, the negative current collecting disc is positioned at the axial end of the winding core, and the negative current collecting disc and the negative tab are welded.
That is, step S200 the axial end portion installation current collecting disc of rolling up the core, current collecting disc' S utmost point ear draw in the district will under the installation effort the utmost point ear of the axial end portion of rolling up the core draws in the district to the utmost point ear includes:
and a positive current collecting disc 2021 is installed at one end of the winding core where the positive lug 201 is located, and then step S300 is executed.
An anode current collecting disc is mounted at one end of the winding core where the anode tab 201 is located, and then step S300 is performed.
Optionally, the predetermined manner includes welding.
In the method for manufacturing the bare cell, the tab collecting area of the current collecting disc is aligned with the tab of the winding core only when the current collecting disc is installed, and then the tab collecting area collects the tab of the winding core into the tab collecting area under the installation acting force of the current collecting disc, so that the tab can be quickly leveled, the installation of the current collecting disc is completed, the tab kneading and leveling process is omitted, the manufacturing process of the bare cell is reduced, and the manufacturing efficiency is improved; and meanwhile, the process of kneading and flattening the tabs is avoided, so that the chips can be prevented from entering the winding core, and the safety performance of the naked battery core is improved.
Optionally, in an embodiment, the current collecting disc is installed at an axial end of the winding core, and the step of collecting the tab at the axial end of the winding core in the tab collecting area under the installation action force includes:
aligning a tab gathering area of a current collecting disc with the position of a tab at one axial end of the winding core, or aligning the central position of the current collecting disc with the central shaft of the winding core;
aligning a pressing piece on the current collecting disc with a gap between two circumferentially adjacent tabs on the winding core;
and applying an installation acting force towards the axial end part on the current collecting disc so as to collect the pole lug into the pole lug collecting area.
Optionally, a compressing member is arranged on the current collecting disc, and in the installation process of the current collecting disc, the first furling part of the current collecting disc is aligned with the tab between the inner ring and the first position through the alignment of the central position of the current collecting disc and the central shaft of the winding core, and the second furling part is aligned with the tab between the outer ring and the first position. By combining the gap between the pressing piece and the tab, the current collecting disc cannot generate circumferential displacement when being installed, and the integrity of the tab in folding is improved.
Optionally, the mounting manner of the positive current collecting disc 2021 is the same as that of the negative current collecting disc, and details are not repeated here.
Optionally, in an embodiment, the step of connecting the tab and the current collecting disc in a preset manner includes:
and welding the lug and the current collecting disc by adopting a preset welding type.
Optionally, the welding type includes at least one of a single welding spot form and a multi-welding spot form, and the welding type is determined according to a length of the connection portion of the current collecting plate.
In this embodiment, the welding process is a pulse laser spot welding process. Optionally, different welding types can be adopted according to different welding lengths of the connecting parts (welding areas) of the current collecting plate, so that the welding stability is improved, and the influence on the welding effect of the current collecting plate due to the overlarge welding surface is avoided.
Optionally, when the length Lc1 of the connecting part is less than or equal to 1.5mm, connecting points adopt a single welding point form, 7-10 connecting points are arranged between every two pressing pieces of the connecting part, and all the connecting points form a circular line; when the length of the connecting part is more than or equal to 1.5mm and less than or equal to 5mm, Lc1 is more than or equal to 5mm, the connecting points adopt a multi-welding-point form, and all the connecting points form a plurality of circular lines with gradually increased diameters. Namely, when the size of the welding area is larger, a multi-welding-point form is adopted, and the connection stability of the current collecting disc and the pole lug is improved.
Optionally, the positive current collecting plate 2021 and the positive tab 201 are welded in the same manner as the negative current collecting plate and the negative tab 201, and no distinction is made between the positive current collecting plate and the negative current collecting plate.
It should be noted that the above mentioned embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (16)
1. The utility model provides a naked electric core, its characterized in that, naked electric core includes:
a winding core including a central axis;
the tabs are arranged at the axial end part of the winding core and are distributed at intervals along the circumferential direction of the winding core, wherein the heights of the tabs arranged along the radial direction of the winding core are gradually changed, so that the tabs are folded towards one side far away from the central shaft;
the current collecting disc is installed at the axial end part of the winding core, a tab collecting area is formed on the current collecting disc, and the tab is collected in the tab collecting area and connected with the current collecting disc.
2. The bare cell of claim 1, wherein a first position is included between the inner ring and the outer ring of the winding core, the height of the tab gradually decreases from the inner ring to the first position, and the height of the tab gradually increases from the first position to the outer ring, so that the tab is folded toward the first position.
3. The bare cell of claim 2, wherein the current collecting plate is formed with a first furling portion, a connecting portion, and a second furling portion in sequence along a radial direction, the first furling portion and the second furling portion are bent along a same side of the connecting portion, the first furling portion, the connecting portion, and the second furling portion enclose the tab furling area, and the connecting portion is disposed corresponding to the first position.
4. The bare cell of claim 3, wherein the length of the connection portion in the radial direction is the same as the length of the connection end surface of the tab after being folded in the radial direction.
5. The bare cell of claim 3, wherein the difference in height between the maximum height and the minimum height of the tab is determined by the difference between the radius of the winding core and the radius of the central shaft and one-half of the length of the connection portion in the radial direction.
6. The bare cell of claim 3, wherein the first folded portion has a same length of bending as the second folded portion, the first folded portion has a length of bending less than the maximum height of the tab of the inner ring, and the second folded portion has a length of bending less than the maximum height of the tab of the outer ring.
7. The bare cell of claim 3, wherein an insulating layer is disposed at both ends of the first folded portion and the second folded portion away from the connecting portion.
8. The bare cell according to claim 3, wherein a compression member is disposed on the connecting portion, and the compression member is disposed in a gap between two circumferentially adjacent tabs.
9. The bare cell according to claim 3, wherein the connection portion has a plurality of connection points disposed thereon, the connection points being distributed along a circumferential direction of the current collecting plate.
10. The bare cell of any of claims 1-9, wherein the tabs comprise positive tabs and negative tabs, the positive tabs and the negative tabs are respectively located at two axial ends of the winding core;
the current collecting disc comprises a positive current collecting disc and a negative current collecting disc, the positive current collecting disc is installed on the winding core and provided with the axial end part of the positive lug, and the negative current collecting disc is installed on the winding core and provided with the axial end part of the negative lug.
11. The bare cell of claim 10, wherein the positive current collecting plate further comprises a positive post connection portion disposed at a center of the positive current collecting plate; and/or, the anode current collecting disc further comprises a through hole, and the through hole is formed in the center of the anode current collecting disc.
12. A cell structure, comprising:
a housing provided with a pole bore;
the positive pole assembly is arranged in the shell and partially penetrates through the pole hole to extend out of the shell;
the bare cell of any of claims 1-11, wherein the bare cell is mounted in the housing, and a positive current collecting plate of the bare cell is connected to the positive post assembly.
13. The cell structure of claim 12, wherein the positive post assembly comprises a positive post, one end of the positive post extends out of the casing through the post hole, and the other end of the positive post is connected to the positive post connection portion of the positive current collecting plate.
14. The utility model provides a preparation method of naked electric core, its characterized in that, preparation method of naked electric core includes following step:
providing a winding core, wherein a plurality of lugs are arranged at the axial end part of the winding core, the lugs are distributed at intervals along the circumferential direction of the winding core, and the height of the lugs arranged along the radial direction of the winding core is gradually changed;
a current collecting disc is installed at the axial end part of the winding core, and a tab collecting area of the current collecting disc collects a tab at the axial end part of the winding core into the tab collecting area under the installation acting force;
and connecting the lug with the current collecting disc in a preset mode.
15. The method of claim 14 wherein the predetermined pattern includes welding, and the step of attaching the tab to the current collecting plate in the predetermined pattern includes:
and welding the pole lug and the current collecting plate by adopting a preset welding type, wherein the welding type comprises at least one of a single-welding-point form and a multi-welding-point form, and the welding type is determined according to the length of a connecting part of the current collecting plate.
16. The method of claim 14, wherein the axial end of the winding core is provided with a current collecting disc, and the step of collecting the tab at the axial end of the winding core in the tab collecting area by the tab collecting area under the mounting action force comprises the following steps:
aligning a tab gathering area of a current collecting disc with the position of a tab at one axial end of the winding core, or aligning the central position of the current collecting disc with the central shaft of the winding core;
aligning a pressing piece on the current collecting disc to a gap between two circumferentially adjacent tabs on the winding core;
and applying an installation acting force towards the axial end part on the current collecting disc so as to collect the pole lug into the pole lug collecting area.
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| CN115692819B (en) * | 2022-11-16 | 2023-11-03 | 楚能新能源股份有限公司 | Full-lug battery cell electrode group, manufacturing process of battery cell electrode group and battery |
| WO2024130675A1 (en) * | 2022-12-23 | 2024-06-27 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, electrical device, and method and apparatus for manufacturing battery cell |
| CN116031466A (en) * | 2023-03-30 | 2023-04-28 | 深圳市誉辰智能装备股份有限公司 | Method for manufacturing cylindrical battery |
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