CN112117498A - Manufacturing method of winding type battery cell, winding type battery cell and lithium battery - Google Patents
Manufacturing method of winding type battery cell, winding type battery cell and lithium battery Download PDFInfo
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- CN112117498A CN112117498A CN202010980839.1A CN202010980839A CN112117498A CN 112117498 A CN112117498 A CN 112117498A CN 202010980839 A CN202010980839 A CN 202010980839A CN 112117498 A CN112117498 A CN 112117498A
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- 238000004804 winding Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 256
- 238000007493 shaping process Methods 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010030 laminating Methods 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 29
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000003475 lamination Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 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
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001291 vacuum drying Methods 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
- 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
- H01M4/06—Electrodes for primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a manufacturing method of a winding type battery cell, the winding type battery cell and a lithium battery.A positive plate, a negative plate and a diaphragm are provided, wherein one side of the positive plate and one side of the negative plate extend to form a positive empty foil area and a negative empty foil area, and the positive empty foil area and the negative empty foil area are provided with a plurality of positive empty foil area and negative empty foil area segments along a first direction; the lengths of the sections of the positive and negative electrode empty foil areas are unequal; laminating and winding the positive plate, the diaphragm and the negative plate in a set order to form a battery cell, wherein the positive empty foil area and the negative empty foil area are respectively positioned at two ends of the battery cell; shaping the positive and negative electrode empty foil areas respectively to enable a plurality of positive and negative electrode empty foil area sections to be laminated together respectively, enabling one ends of the positive and negative electrode empty foil area sections far away from the centers of the positive and negative electrode plates to be flush, and welding all the positive and negative electrode empty foil area sections to form positive and negative electrode lugs respectively. The method has the characteristics of simplifying the process flow and improving the production quality of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a manufacturing method of a winding type battery cell, the winding type battery cell manufactured by the manufacturing method and a lithium battery comprising the winding type battery cell.
Background
In the current production of lithium batteries, especially the tab of a wound battery is usually manufactured by leading out foils from a pole piece, shaping a plurality of foils together after winding and welding to form the tab. Because the battery core formed after winding has a certain thickness, the ends of the foil are in a step shape after being shaped together. After welding, the end of the tab needs to be cut to make the end flat. However, metal chips are generated during cutting, and the metal chips left in the battery core can cause safety hazards to the operation of the battery.
Disclosure of Invention
The invention aims to provide a manufacturing method of a winding type battery cell, the winding type battery cell and a lithium battery, wherein the end part of a shaped tab is flat, the hidden danger of cutting scrap remaining caused by subsequent cutting is avoided, and the quality of the battery is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the manufacturing method of the winding type battery cell comprises the following steps:
providing a positive plate, a negative plate and a diaphragm, wherein one side of the positive plate extends to form a positive empty foil area, the positive empty foil area is provided with a plurality of positive empty foil area segments along a first direction, one side of the negative plate extends to form a negative empty foil area, and the negative empty foil area is provided with a plurality of negative empty foil area segments along the first direction;
making the lengths of the sections of the anode empty foil areas different and making the lengths of the sections of the cathode empty foil areas different;
laminating and winding the positive plate, the diaphragm and the negative plate in a set order to form a battery cell, wherein the positive empty foil area and the negative empty foil area are respectively positioned at two ends of the battery cell;
shaping the positive electrode empty foil area to enable a plurality of positive electrode empty foil area sections to be laminated together, enabling one ends, far away from the center of the positive plate, of the positive electrode empty foil area sections to be flush, and welding all the positive electrode empty foil area sections to form positive lugs;
and shaping the negative electrode empty foil area to enable a plurality of negative electrode empty foil area sections to be laminated together, enabling one ends of the negative electrode empty foil area sections, which are far away from the center of the negative electrode piece, to be flush, and welding all the negative electrode empty foil area sections to form negative electrode lugs.
Further, the length direction of the positive electrode empty foil area segment and the length direction of the negative electrode empty foil area segment are perpendicular to the first direction, the lengths of the positive electrode empty foil area segments are sequentially increased from the first end to the second end of the positive electrode plate, the electric core is formed by winding from the first end, the positive electrode empty foil area segments are extruded from two sides of the electric core to the center of the electric core along the thickness direction of the electric core, all the positive electrode empty foil area segments are laminated together to form the positive electrode lug, and the shortest positive electrode empty foil area segment is located at the center of the positive electrode lug.
Furthermore, along the first direction, the plurality of positive electrode empty foil zone segments are sequentially connected end to end, and two adjacent positive electrode empty foil zone segments are in arc transition.
Furthermore, along the first direction, a plurality of the positive electrode empty foil zone segments are arranged at intervals, each positive electrode empty foil zone segment comprises two positive electrode empty foil zone segments arranged at intervals along the first direction, and along the thickness direction of the battery cell, the two positive electrode empty foil zone segments are respectively positioned on two sides of the axis of the battery cell.
And further, extruding the battery cell after winding to enable the positive plate to be provided with a plurality of straight sections which are distributed at intervals along the thickness direction of the battery cell, wherein each positive empty foil area segment is positioned on the corresponding straight section, and the length of each positive empty foil area segment is sequentially increased from the center to the two ends of the battery cell.
And further, the two shortest positive electrode empty foil area small sections are close to the center of the battery cell and are pre-fixed, the two shortest positive electrode empty foil area small sections are taken as a reference, and the rest positive electrode empty foil area small sections are close to the reference and are welded to form the positive electrode lugs.
Furthermore, the manufacturing mode of the negative electrode tab is consistent with that of the positive electrode tab.
Further, after shaping, the positive electrode empty foil area and the negative electrode empty foil area are pre-fixed in a spot welding mode respectively.
The winding type battery cell is manufactured and molded by the manufacturing method of the winding type battery cell.
Still provide a lithium cell, including shell and electric core, electric core install in the shell, the electric core is coiling formula electricity core.
Compared with the prior art, the invention has the beneficial effects that:
according to the manufacturing method of the winding type battery cell and the lithium battery, the positive pole empty foil area section and the negative pole empty foil area section on the positive pole piece and the negative pole piece are respectively set to be different in length and size, so that after the positive pole piece and the negative pole piece are wound and shaped to form the battery cell, one ends of the positive pole empty foil area and the negative pole empty foil area, which are far away from the battery cell, are flush, the subsequent cutting of one ends, which are aligned and far away from the battery cell, of the negative pole lug is avoided, the potential safety hazard caused by cutting scrap is avoided, and the manufacturing method has the characteristics of simplifying the process flow and improving the.
Drawings
Fig. 1 is a front view of a wound cell of an embodiment.
Fig. 2 is a side view of a wound cell of an embodiment.
Fig. 3 is a schematic view of a positive electrode sheet of the embodiment. (expanded state)
Fig. 4 is a cross-sectional view (before tab reshaping) of a wound cell of another embodiment.
Fig. 5 is a cross-sectional view of a wound cell (after tab reshaping) according to another embodiment.
Fig. 6 is a schematic view of a positive electrode sheet according to another embodiment. (expanded state)
In the figure:
1. an electric core; 10. a tab; 11. a positive plate; 110. a positive electrode empty foil region; 1101. a small section of positive electrode empty foil area; 12. a negative plate; 13. a diaphragm.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 6, in the manufacturing method of the winding type battery cell provided by the present invention, a positive plate 11, a negative plate 12 and a separator 13 are provided, one side of the positive plate 11 extends to form a positive empty foil area 110, the positive empty foil area 110 has a plurality of positive empty foil area segments along a first direction, one side of the negative plate 12 extends to form a negative empty foil area, and the negative empty foil area has a plurality of negative empty foil area segments along the first direction; the lengths of the sections of the positive electrode empty foil areas are unequal, and the lengths of the sections of the negative electrode empty foil areas are unequal; laminating and winding the positive plate 11, the diaphragm 13 and the negative plate 12 in a set order to form the battery cell 1, wherein the positive empty foil area 110 and the negative empty foil area are respectively positioned at two ends of the battery cell 1; shaping the positive electrode empty foil area 110, laminating a plurality of positive electrode empty foil area sections together, and welding all the positive electrode empty foil area sections to form a positive electrode lug, wherein one ends of the positive electrode empty foil area sections, which are far away from the center of the positive electrode plate 11, are flush; and shaping the negative empty foil area to enable a plurality of negative empty foil area sections to be laminated together, enabling one ends of the negative empty foil area sections, far away from the center of the negative plate 12, to be flush, and welding all the negative empty foil area sections to form the negative ears. It can be understood that, when a winding type battery cell is manufactured, the diaphragm 13, the positive plate 11, the diaphragm 13, the negative plate 12 and the diaphragm 13 are sequentially laminated together, and then the battery cell 1 is formed by winding along one end of the positive plate 11 or the negative plate 12 to the other end, wherein the tabs 10 are arranged at two ends of the battery cell 1, and the tabs 10 include the positive tab and the negative tab. The positive tab is formed by winding, shaping and welding a positive empty foil area 110 on the positive plate 11, and the negative tab is formed by winding, shaping and welding a negative empty foil area on the negative plate 12. The positive electrode sheet 11 and the negative electrode sheet 12 are manufactured by the prior art, the positive electrode sheet 11 and the negative electrode sheet 12 are formed by coating slurry on the surfaces of an aluminum sheet and a copper sheet respectively, a blank area is left on one side of the aluminum sheet and the copper sheet, and the blank area is not coated with the slurry, namely, a positive electrode blank area 110 and a negative electrode blank area for manufacturing a positive electrode tab and a negative electrode tab are formed respectively. When the pole pieces are laminated, the number of the positive pole pieces 11 and the negative pole pieces 12 can be one or more, the positive pole pieces 11 and the negative pole pieces 12 are distributed in a staggered manner, and each positive pole piece 11 and each negative pole piece 12 are separated by a diaphragm 13. When stacking, the positive electrode empty foil area 110 and the negative electrode empty foil area on the positive electrode sheet 11 and the negative electrode sheet 12 are oppositely arranged, so that the positive electrode tab and the negative electrode tab formed after winding are respectively located at two ends of the battery core 1. Because the positive plates 11 and the negative plates 12 are distributed in a staggered manner, the positive empty foil area 110 and the negative empty foil area are respectively distributed in a spiral shape on two end faces of the battery core 1 after winding. The positive empty foil area 110 and the negative empty foil area are shaped to be close together and welded to form a positive tab and a negative tab respectively. During shaping, the positive electrode empty foil area located on the periphery of the battery cell 1 is close to the positive electrode empty foil area located in the middle of the battery cell. From the middle part to the peripheral part of the battery core 1, the bent lengths of the positive electrode empty foil areas 110 at the positions are different when the positive electrode empty foil areas 110 are close to the positive electrode empty foil areas 110 at the middle part, and in order to enable the positive electrode empty foil areas 110 at the positions to be bent and then to be parallel and level with one end of the battery core 1, the positive electrode empty foil areas 110 are arranged into a plurality of positive electrode empty foil area segments with different lengths, so that the lengths of the positive electrode empty foil area segments at the middle part to the positive electrode empty foil area segments at the peripheral part are sequentially increased. This structure can make each anodal empty foil district section deviate from the one end parallel and level of electric core 1 after buckling. Consequently can avoid forming behind the anodal ear to adjust the utmost point ear and deviate from the one end of electric core 1 and cut, reduce the subsequent handling, improve production efficiency, the smear metal is left over in electric core 1 when effectively avoiding cutting anodal ear simultaneously, causes the potential safety hazard to the battery operation. Similarly, the negative tab is made in the same manner as the positive tab. This embodiment sets up to different length size through dividing into the empty paper tinsel district segmentation of positive pole and the empty paper tinsel district of negative pole on the positive plate 11 and the negative pole piece 12 respectively, so that just, the negative pole piece is through coiling, the plastic forms electric core 1 back, the empty paper tinsel district of positive pole and the empty paper tinsel district of negative pole deviate from electric core 1's one end parallel and level, avoid follow-up adjusting well, the negative pole ear deviates from the one end of electric core 1 and cuts, and then the potential safety hazard of having avoided the smear metal to leave over, have the characteristics of simplifying process flow and improving battery production quality.
Specifically, when the positive tab and the negative tab are manufactured, the positive tab and the negative tab can be manufactured by front and back steps, the front and back steps of the two can be exchanged, and the two can also be manufactured by the same step.
Referring to fig. 3, the first direction is a longitudinal direction (unwound state) when positive electrode sheet 11 is not wound, and the longitudinal direction of the positive electrode blank section is perpendicular to the first direction. When the positive electrode sheet 11 is wound, it is wound from one end to the other end in the longitudinal direction.
Specifically, the length direction of the positive electrode empty foil area segment and the negative electrode empty foil area segment is perpendicular to the first direction, the length of the positive electrode empty foil area segment increases sequentially from the first end to the second end of the positive electrode plate 11, the positive electrode empty foil area segment is wound from the first end of the positive electrode plate 11 to form the battery cell 1, the positive electrode empty foil area segment is extruded from two sides of the battery cell 1 to the center of the battery cell 1 along the thickness direction of the battery cell 1, all the positive electrode empty foil area segments are laminated together to form the positive electrode tab, and the shortest positive electrode empty foil area segment is located at the center of the positive electrode tab. It can be understood that the winding start end of the positive plate 11 is located at the center of the battery cell 1, that is, the shortest positive electrode empty foil zone segment is located at the center of the battery cell 1, and the length of the positive electrode empty foil zone segment from the center to the two ends is gradually increased along the thickness direction of the battery cell 1, so that after the positive electrode empty foil zone segments at the two ends are closed to the center, one end of each positive electrode empty foil zone segment departing from the battery cell 1 can be aligned and level. After winding, the electric core 1 is extruded in the thickness direction thereof, so that the electric core 1 is flat. Along the thickness direction (shown in the drawing Z direction) of the battery cell 1, the positive electrode tab 11 and the corresponding positive electrode empty foil region 110 located at two sides of the center thereof are flat or approximately flat. Along the width direction (shown in the figure Y direction) of the battery cell 1, the positive plates 1 located at two sides of the center thereof and the corresponding positive cavity area 110 are arc-shaped, so that the end surfaces of two ends of the battery cell 1 are in a shape of a "runway". After winding and shaping, each positive electrode hollow foil area is distributed on two sides or peripheral part of the axis of the battery core 1 in sections. Similarly, the manufacturing method of the negative tab is the same as that of the positive tab, and is not described herein.
In an embodiment, referring to fig. 1 to fig. 3, the tab 10 on the battery cell 1 is a full tab. The specific manufacturing method comprises the following steps:
and S10, manufacturing the positive plate 11 and the negative plate 12, and cutting the positive empty foil area 110 on the positive plate 11 and the negative empty foil area on the negative plate 12 to form positive empty foil area sections and negative empty foil area sections with different length sizes, wherein the lengths of the positive empty foil area sections are sequentially increased from one end of the positive plate 11 to the other end. In the step, the cutting can be carried out by adopting a hardware die cutting or laser cutting mode. The length size of the positive and negative electrode empty foil area segments is determined by the position change of each positive and negative electrode empty foil area segment before and after shaping, and the specific size of the positive and negative electrode empty foil area segments can be calculated by using a mathematical model, so that after shaping, after all the positive electrode empty foil area segments or the negative electrode empty foil area segments are closed, one end of each positive electrode empty foil area segment or each negative electrode empty foil area segment departing from the battery cell 1 is flush;
s11, winding the pole pieces, alternately laminating the positive pole piece 11, the negative pole piece 12 and the separator 13, and starting from one end of the shortest positive pole empty foil area segment or negative pole empty foil area segment to form the battery cell 1. The positive electrode empty foil region 110 and the negative electrode empty foil region are located at both ends of the battery cell 1 in the longitudinal direction (illustrated X direction). In this step, each positive electrode empty foil section or each negative electrode empty foil section surrounds the center of the battery cell 1 for one circle. Therefore, the width dimension of each positive electrode empty foil area segment and each negative electrode empty foil area segment can be selected correspondingly according to the position of each positive electrode empty foil area segment and each negative electrode empty foil area segment after being wound. The width dimension closest to the center of the battery cell 1 is the shortest, and the width dimension farthest from the center of the battery cell 1 is the longest. For example: the positive electrode sheet 11 shown in FIG. 3 has positive electrode empty foil area segments with width dimensions h1 < h2 < h 3. From the left end to the right end of the positive plate 11, the length of each positive empty foil area segment is increased in sequence, namely S1 is more than S2 is more than S3;
s12, extruding and shaping, namely extruding the battery core 1 to be flat, respectively drawing the positive electrode empty foil area section and the negative electrode empty foil area section from two sides to the center along the thickness direction of the battery core 1 and laminating the sections together, and pre-fixing the sections through ultrasonic spot welding. The shortest positive pole empty foil area section or negative pole empty foil area section is located the central point of electric core 1, and the shaping makes all positive pole empty foil area sections and all negative pole empty foil area sections deviate from the one end parallel and level of electric core 1. Referring to fig. 2, the center of the battery cell 1 refers to a horizontal cross section located at the center of the battery cell 1, and the axis of the battery cell 1 is located on the horizontal cross section.
And S13, welding all the positive electrode empty foil section segments to form positive electrode lugs, and welding all the negative electrode empty foil section segments to form negative electrode lugs. The step adopts an ultrasonic welding mode to carry out welding.
Specifically, along a first direction, a plurality of positive electrode empty foil sections are sequentially connected end to end, and two adjacent positive electrode empty foil sections are in arc transition. It can be understood that the length difference exists between two adjacent positive electrode empty foil zone segments, and the arc transition between the two adjacent positive electrode empty foil zone segments can avoid the intersection of the two adjacent positive electrode empty foil zone segments from being torn due to external force during winding, extrusion or shaping.
In another embodiment, referring to fig. 4 to 6, in the first direction, a plurality of positive electrode empty foil zone segments are arranged at intervals, each positive electrode empty foil zone segment includes two positive electrode empty foil zone segments 1101 arranged at intervals in the first direction, and in the thickness direction of the battery cell 1, the two positive electrode empty foil zone segments 1101 are respectively located on two sides of the axis of the battery cell. In this embodiment, a plurality of positive electrode empty foil area segments are arranged on the positive electrode sheet 11 at intervals, each positive electrode empty foil area segment includes two positive electrode empty foil area small segments 1101 arranged at intervals, the width dimensions t of all the positive electrode empty foil area small segments 1101 are the same, and the width dimension t of the positive electrode empty foil area small segments 1101 is the width dimension of the positive electrode tab. The length dimension of the positive electrode empty foil area segment gradually increases from one end of the positive electrode sheet 11 to the other end, namely S1 < S2 < S3. After winding, two positive electrode empty foil zone segments 1101 in the same positive electrode empty foil zone segment are located on both sides of the axis of the battery cell 1, and the two positive electrode empty foil zone segments 1101 are aligned in the thickness direction of the battery cell 1. Shaping the positive electrode empty foil zone segments 1101 so that the positive electrode empty foil zone segments 1101 are laminated together toward the center of the cell 1, the end of each positive electrode empty foil zone segment 1101 facing away from the cell 1 is aligned, and the two sides of each positive electrode empty foil zone segment 1101 connected with the cell 1 are aligned.
Specifically, after winding, the battery cell 1 is extruded, so that the positive plate 11 has a plurality of flat sections distributed at intervals along the thickness direction of the battery cell 1, each positive electrode empty foil area segment 1101 is located on the corresponding flat section, and the length of the positive electrode empty foil area segment gradually increases from the center to both ends of the battery cell 1. It can be understood that, extrude at the thickness direction of electric core 1 and form straight section, can make and correspond the empty foil district subsection 1101 of positive pole that sets up on straight section and be in straight state, all the empty foil district subsections 1101 of positive pole of being convenient for draw close the straight lamination together of back to electric core 1 central point, and the plastic of being convenient for makes its each side align each other, and the positive ear appearance of formation is pleasing to the eye, neat, avoids follow-up cutting. Similarly, the manufacturing method of the negative tab is the same as that of the positive tab, and is not described herein. Referring to fig. 4, the center of the battery cell 1 refers to a horizontal cross section located at the center of the battery cell 1, and the axis of the battery cell 1 is located on the horizontal cross section.
Specifically, the shortest two positive electrode empty foil zone segments 1101 are brought together toward the center of the battery cell 1 and pre-fixed, and with reference to the shortest two positive electrode empty foil zone segments 1101, all the positive electrode empty foil zone segments 1101 are brought together toward the reference and welded to form positive electrode tabs. It can be understood that the shortest two positive empty foil zone segments 1101 are located near the center of the battery cell 1, and the shortest two positive empty foil zone segments 1101 are located at the center of the positive tab, so that the shortest two positive empty foil zone segments 1101 are first fixed close to each other to serve as a reference for positioning the position of the positive tab. The remaining positive empty foil section segments 1101 are sequentially brought closer to the reference, and shaped so that the sides of all positive empty foil section segments 1101 are aligned, and finally welded to form positive tabs. In the mode, the shortest positive electrode empty foil area segment 1101 is used as a reference to position the position of the positive electrode tab, so that the position precision and appearance forming of the positive electrode tab manufacturing are improved, and the battery manufacturing quality is improved.
The specific manufacturing steps of this embodiment are as follows:
s20, manufacturing the positive plate 11 and the negative plate 12, and cutting the positive empty foil area 110 on the positive plate 11 and the negative empty foil area on the negative plate 12 to form a small positive empty foil area segment 1101 and a small negative empty foil area segment with different length sizes and equal width sizes t, wherein the length of the positive empty foil area segment or the negative empty foil area segment is gradually increased from one end of the positive plate 11 or the negative plate 12 to the other end. In the step, the cutting can be carried out by adopting a hardware die cutting or laser cutting mode. The distance between two adjacent positive and negative electrode empty foil area small sections and the distance between two adjacent positive and negative electrode empty foil area small sections can be calculated by using a mathematical model, so that after shaping, after all the positive electrode empty foil area small sections 1101 or the negative electrode empty foil area small sections are closed, one end of each positive electrode empty foil area small section 1101 or each negative electrode empty foil area small section departing from the battery cell 1 is flush;
s21, winding the pole pieces, stacking the positive pole piece 11, the negative pole piece 12 and the diaphragm 13 alternately, and starting winding from one end of the shortest positive pole empty foil area segment 1101 or negative pole empty foil area segment to form the battery core 1. The positive electrode empty foil area 110 and the negative electrode empty foil area are respectively located at two ends of the battery core 1 in the length direction.
And S22, extruding and shaping, namely extruding the battery cell 1 to be flat, so that the positive plate 11 and the negative plate 12 form straight sections, and the straight sections are distributed at intervals along the thickness direction of the battery cell 1. Each positive electrode empty foil area segment 1101 and each negative electrode empty foil area segment are respectively located on the corresponding straight segment, so that each positive electrode empty foil area segment 1101 and each negative electrode empty foil area segment are in a straight state and are respectively distributed at intervals along the thickness direction of the electric core 1. The shortest two positive electrode empty foil area sections 1101 are close to the center of the battery cell 1 and are pre-fixed, the two shortest positive electrode empty foil area sections 1101 are used as a reference, and the rest positive electrode empty foil area sections 1101 are close to the reference and are laminated together, and are pre-fixed through ultrasonic spot welding. The shortest positive empty foil zone segment 1101 or negative empty foil zone segment is located at the center of the electric core 1, and the shaping aligns all the positive empty foil zone segments 1101 and all the negative empty foil zone segments at the end away from the electric core 1, and aligns all the positive empty foil zone segments 1101 and all the negative empty foil zone segments at the two sides where the electric core 1 intersects.
And S23, welding all the sections 1101 of the positive electrode empty foil area to form a positive electrode tab, and welding all the sections 1101 of the negative electrode empty foil area to form a negative electrode tab. The step adopts an ultrasonic welding mode to carry out welding.
Specifically, after shaping, the positive electrode empty foil area segment and the negative electrode empty foil area segment are pre-fixed in a spot welding mode respectively. It can be understood that the positive electrode empty foil area segment and the negative electrode empty foil area segment are pre-fixed after shaping, so that the loosening can be avoided, and the subsequent welding operation is facilitated.
Specifically, when the positive empty foil area 110 and the negative empty foil area are manufactured, the positive empty foil area segment, the negative empty foil area segment, the positive empty foil area small segment 1101 and the negative empty foil area small segment are cut in a hardware die cutting or laser die cutting mode. It can be understood that hardware die cutting and laser die cutting are common modes for cutting the pole piece, and the specific cutting mode can be flexibly selected according to the specific shapes of the positive and negative pole empty foil areas and the specific equipment configuration conditions. After cutting, metal cuttings need to be cleaned, and the metal cuttings are prevented from being left in the battery. The traditional process integrally cuts all pole pieces after lamination, the amount of cut chips generated is large, the cut chips enter the lamination and are not easy to clean, and the problem of cutting residue is easy to occur. According to the embodiment, the single pole piece is cut before lamination, the generated cutting scraps are cleaned, and the cutting residues can be effectively reduced.
The remarkable effects of the embodiment are as follows: through setting up the empty paper tinsel district segmentation of positive pole and the empty paper tinsel district segmentation of negative pole on positive plate 11 and the negative pole piece 12 respectively into different length size to make just, the negative pole piece is through coiling, the plastic forms electric core 1 back, the empty paper tinsel district 110 of positive pole and the empty paper tinsel district of negative pole deviate from electric core 1's one end parallel and level, avoid follow-up adjusting well, the negative pole ear deviates from the one end of electric core 1 and cuts, and then the potential safety hazard of having avoided the smear metal to leave over, have the characteristics of simplifying process flow and improving battery production quality.
The winding type battery cell is also provided and manufactured by the manufacturing method. The method avoids cutting the positive and negative electrode tabs after the positive and negative electrode foil areas are welded, effectively avoids metal cutting scraps left in the battery core after cutting, and the winding type battery core has the characteristic of high safety.
Still provide a lithium cell, including shell and electric core, electric core installation is in the shell, and electric core is foretell coiling formula electricity core. And the shell is also provided with a polar column, after the electric core is manufactured, the electric core is installed in the shell, and the positive and negative polar columns are respectively connected with the corresponding polar columns. And then the lithium battery is formed after the procedures of vacuum drying, liquid injection, sealing, formation, capacity grading, detection and the like.
The remarkable effects of the embodiment are as follows: by adopting the method for manufacturing the tab, the subsequent cutting process is reduced, the process flow is simplified, and the quality of the battery is improved.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A manufacturing method of a winding type battery cell is characterized by comprising the following steps:
providing a positive plate, a negative plate and a diaphragm, wherein one side of the positive plate extends to form a positive empty foil area, the positive empty foil area is provided with a plurality of positive empty foil area segments along a first direction, one side of the negative plate extends to form a negative empty foil area, and the negative empty foil area is provided with a plurality of negative empty foil area segments along the first direction;
making the lengths of the sections of the anode empty foil areas different and making the lengths of the sections of the cathode empty foil areas different;
laminating and winding the positive plate, the diaphragm and the negative plate in a set order to form a battery cell, wherein the positive empty foil area and the negative empty foil area are respectively positioned at two ends of the battery cell;
shaping the positive electrode empty foil area to enable a plurality of positive electrode empty foil area sections to be laminated together, enabling one ends, far away from the center of the positive plate, of the positive electrode empty foil area sections to be flush, and welding all the positive electrode empty foil area sections to form positive lugs;
and shaping the negative electrode empty foil area to enable a plurality of negative electrode empty foil area sections to be laminated together, enabling one ends of the negative electrode empty foil area sections, which are far away from the center of the negative electrode piece, to be flush, and welding all the negative electrode empty foil area sections to form negative electrode lugs.
2. The method of claim 1, wherein the length directions of the positive electrode empty foil area segment and the negative electrode empty foil area segment are perpendicular to the first direction, the lengths of the positive electrode empty foil area segments increase sequentially from the first end to the second end of the positive electrode sheet, the positive electrode empty foil area segments are wound from the first end to form the battery cell, the positive electrode empty foil area segments are pressed from two sides of the battery cell to the center of the battery cell along the thickness direction of the battery cell, all the positive electrode empty foil area segments are laminated together to form the positive electrode tab, and the shortest positive electrode empty foil area segment is located at the center of the positive electrode tab.
3. The method of manufacturing a wound electrical core according to claim 2, wherein, along the first direction, the plurality of positive electrode empty foil sections are sequentially connected end to end, and two adjacent positive electrode empty foil sections are in arc transition.
4. The method of manufacturing a wound electrical core according to claim 2, wherein, in the first direction, a plurality of positive electrode empty foil zone segments are arranged at intervals, each positive electrode empty foil zone segment includes two positive electrode empty foil zone segments arranged at intervals in the first direction, and the two positive electrode empty foil zone segments are respectively located on two sides of an axis of the electrical core in a thickness direction of the electrical core.
5. The method of claim 4, wherein the cell is extruded after winding, so that the positive plate has a plurality of straight sections distributed at intervals along the thickness direction of the cell, each section of the positive empty foil area is located on the corresponding straight section, and the lengths of the sections of the positive empty foil area increase sequentially from the center to both ends of the cell.
6. The method of manufacturing a wound electrical core according to claim 5, wherein the shortest two segments of the positive electrode empty foil area are moved closer to the center of the electrical core and pre-fixed, and the remaining segments of the positive electrode empty foil area are moved closer to the reference and welded to form the positive tab.
7. The method of any one of claims 2 to 6, wherein the negative electrode tab is fabricated in a manner consistent with that of the positive electrode tab.
8. The method of manufacturing a wound electrical core according to claim 1, wherein after the shaping, the positive electrode empty foil area and the negative electrode empty foil area are pre-fixed by spot welding.
9. A coiled electrical core, characterized in that it is formed by the method of any of claims 1 to 8.
10. A lithium battery comprising a casing and a cell mounted in the casing, wherein the cell is the wound cell of claim 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122530A (en) * | 2021-11-22 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Roll core, square all-electrode-lug lithium ion battery and battery manufacturing method |
| CN117457965A (en) * | 2023-12-25 | 2024-01-26 | 天鹏锂能技术(淮安)有限公司 | Winding electric core |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2833899Y (en) * | 2005-08-26 | 2006-11-01 | 周基平 | Lithium ion cell pole pieces and core |
| CN1921180A (en) * | 2005-08-26 | 2007-02-28 | 周基平 | Lithium ion battery pole piece, electricity core and method for making same |
| CN202050030U (en) * | 2011-05-20 | 2011-11-23 | 无锡市明杨电池有限公司 | Lithium ion battery with high-multiplying-power discharge performance |
| US20150111090A1 (en) * | 2013-10-17 | 2015-04-23 | Samsung Sdi Co., Ltd. | Secondary battery and manufacturing method thereof |
| JP2016115422A (en) * | 2014-12-11 | 2016-06-23 | 株式会社東芝 | Electrode group, battery, and method of manufacturing battery |
| EP3139425A1 (en) * | 2015-09-04 | 2017-03-08 | Samsung SDI Co., Ltd. | Method for manufacturing rechargeable battery and rechargeable battery manufactured using the same |
| CN207818739U (en) * | 2018-02-08 | 2018-09-04 | 宁德时代新能源科技股份有限公司 | Electrode assembly |
| CN207993994U (en) * | 2018-04-16 | 2018-10-19 | 中天鸿锂清源股份有限公司 | The rectangular winding battery core of lithium dynamical battery |
-
2020
- 2020-09-17 CN CN202010980839.1A patent/CN112117498A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2833899Y (en) * | 2005-08-26 | 2006-11-01 | 周基平 | Lithium ion cell pole pieces and core |
| CN1921180A (en) * | 2005-08-26 | 2007-02-28 | 周基平 | Lithium ion battery pole piece, electricity core and method for making same |
| CN202050030U (en) * | 2011-05-20 | 2011-11-23 | 无锡市明杨电池有限公司 | Lithium ion battery with high-multiplying-power discharge performance |
| US20150111090A1 (en) * | 2013-10-17 | 2015-04-23 | Samsung Sdi Co., Ltd. | Secondary battery and manufacturing method thereof |
| JP2016115422A (en) * | 2014-12-11 | 2016-06-23 | 株式会社東芝 | Electrode group, battery, and method of manufacturing battery |
| EP3139425A1 (en) * | 2015-09-04 | 2017-03-08 | Samsung SDI Co., Ltd. | Method for manufacturing rechargeable battery and rechargeable battery manufactured using the same |
| CN207818739U (en) * | 2018-02-08 | 2018-09-04 | 宁德时代新能源科技股份有限公司 | Electrode assembly |
| CN207993994U (en) * | 2018-04-16 | 2018-10-19 | 中天鸿锂清源股份有限公司 | The rectangular winding battery core of lithium dynamical battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122530A (en) * | 2021-11-22 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Roll core, square all-electrode-lug lithium ion battery and battery manufacturing method |
| CN117457965A (en) * | 2023-12-25 | 2024-01-26 | 天鹏锂能技术(淮安)有限公司 | Winding electric core |
| CN117457965B (en) * | 2023-12-25 | 2024-04-02 | 天鹏锂能技术(淮安)有限公司 | Winding electric core |
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Application publication date: 20201222 |