CN117878430A - Forming device of lamination battery cell - Google Patents
Forming device of lamination battery cell Download PDFInfo
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- CN117878430A CN117878430A CN202410051819.4A CN202410051819A CN117878430A CN 117878430 A CN117878430 A CN 117878430A CN 202410051819 A CN202410051819 A CN 202410051819A CN 117878430 A CN117878430 A CN 117878430A
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- Prior art keywords
- negative electrode
- positive electrode
- diaphragm
- small piece
- material belt
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- 238000003475 lamination Methods 0.000 title description 11
- 239000007774 positive electrode material Substances 0.000 claims abstract description 25
- 239000007773 negative electrode material Substances 0.000 claims abstract description 23
- 230000000712 assembly Effects 0.000 claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 11
- 239000011888 foil Substances 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 239000011889 copper foil Substances 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052744 lithium Inorganic materials 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 238000003466 welding Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000000608 laser ablation Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008185 minitablet Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
Abstract
The invention discloses a forming device of a laminated battery core, which comprises at least one unit component, wherein the unit component comprises a negative electrode material belt and a positive electrode material belt which are stacked up and down, and the negative electrode material belt and the positive electrode material belt are separated by a continuous diaphragm; the negative electrode material belt and the positive electrode material belt are respectively provided with a negative electrode lug and a positive electrode lug, and the diaphragm, the negative electrode material belt, the diaphragm and the positive electrode material belt which are stacked up and down are wound to form a unit assembly. The diaphragm is separated by a continuous diaphragm, so that the correction and control are relatively simple, the weight and the space occupation ratio of the diaphragm in the whole battery cell can be reduced, and the energy density of the lithium battery can be improved; the single unit assembly is provided with the positive electrode lug and the negative electrode lug respectively, and then the plurality of unit assemblies are stacked; the required welder power corresponds to little.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a forming device of a laminated battery cell.
Background
The battery core of the lithium ion battery is composed of a positive plate, a diaphragm and a negative plate, and the battery core is mainly of a laminated structure at present.
The lamination cell adopts a Z-type lamination process: the positive and negative plates are prepared in advance, the diaphragm directly swings in a Z shape or the lamination table swings in a Z shape (the diaphragm is caused to indirectly swing in a Z shape), and then the positive and negative plates are alternately placed on the diaphragm until lamination with the designated layer number is completed. The bottleneck of the process is that the mechanical beat of transferring the positive and negative plates is difficult to effectively improve, the lamination efficiency is low, and the manipulator can only transfer one positive plate or one negative plate at a time.
As disclosed in the prior art with patent publication number CN114883659a, entitled laminated cell assembly and method for making laminated cell assembly. The laminated cell assembly includes at least one cell structure including: the positive electrode unit comprises at least two positive electrode plates which are electrically connected; a negative electrode unit including at least two negative electrode sheets electrically connected; the diaphragm is folded for lamination, and comprises a plurality of diaphragm sections which are sequentially connected in the thickness direction, wherein every two adjacent diaphragm sections are arranged at intervals; wherein, at least two positive pole pieces and at least two negative pole pieces set up alternately along thickness direction, and positive pole piece and negative pole piece separate through the diaphragm section. The diaphragm used in the patent is a complete single-piece independent diaphragm, so that the problems of relative complexity and difficulty in correction and control exist, meanwhile, the foil between the two small pole pieces is used as an anode lug and a cathode lug respectively, after the stacking of the battery cells is completed, each layer of anode lug and each layer of cathode lug are required to be welded together respectively, the number of the pole lugs is more, the number of layers required to be welded is also more, and the risk of welding false welding is also greater; the larger the required welder power corresponds, the higher the welder procurement cost.
Therefore, in order to solve the above-mentioned drawbacks, the present invention provides a forming device for laminated battery cells.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to provide a forming device of lamination electric core that is convenient for control, the welding layer number is less and the welding risk is less.
In order to solve the technical problems, the invention provides the following technical scheme:
the forming device of the laminated battery core comprises at least one unit component, wherein the unit component comprises a negative electrode material belt and a positive electrode material belt which are stacked up and down, and the negative electrode material belt and the positive electrode material belt are separated by a continuous diaphragm;
the negative electrode material belt and the positive electrode material belt are respectively provided with a negative electrode lug and a positive electrode lug, and a diaphragm, the negative electrode material belt, the diaphragm and the positive electrode material belt which are stacked up and down are wound to form a unit assembly, and then a plurality of unit assemblies are stacked and welded.
Compared with the traditional independent diaphragm, the diaphragm is relatively simple in correction and control, and meanwhile, the weight and the space occupation ratio of the diaphragm in the whole battery core can be reduced, and the energy density of the lithium battery is improved; the single unit component is provided with the positive electrode lug and the negative electrode lug respectively, and then a plurality of unit components are stacked, so that the invention only needs to weld a small number of electrode lugs together, and the welding layers are smaller, thereby reducing the risk of welding false welding; the smaller the required welder power corresponds, the less cost the welder is purchased.
As a further scheme of the invention: the negative electrode material belt comprises a negative electrode single sheet, the negative electrode single sheet comprises a plurality of negative electrode tiny sheets, each negative electrode coating area is connected through copper foil, and the copper foil extending to the leftmost side is a negative electrode lug;
the positive electrode material is provided with a positive electrode single sheet, the positive electrode single sheet comprises a plurality of positive electrode tiny sheets, each positive electrode tiny sheet is connected through aluminum foils, and the aluminum foils extending to the leftmost side are positive electrode lugs.
As a further scheme of the invention: the width of each negative electrode small piece is S1, and the interval between every two adjacent negative electrode small pieces is T1; the width of each positive minimum sheet is S2, and the interval between adjacent positive minimum sheets is T2;
wherein S1 > T1, S2 > T2, S1 > S2, T2 > T1.
As a further scheme of the invention: the lengths of the negative electrode single chip, the positive electrode single chip and the diaphragm are respectively Q1, Q2 and Q3, wherein Q3 is more than Q1 and more than Q2.
As a further scheme of the invention: the diaphragm-negative micro sheet-diaphragm-positive micro sheet is placed from bottom to top in sequence, and the four layers of units are folded from the rightmost end anticlockwise in sequence to form a unit assembly.
As a further scheme of the invention: the separator comprises a plurality of separator small pieces, and the plurality of separator small pieces are paved between the cathode small pieces and the anode small pieces.
As a further scheme of the invention: the width of the diaphragm small piece is S3, the length of the diaphragm small piece is Q3, and the distance between the diaphragm small piece and the adjacent diaphragm small piece is T3;
and satisfies the following conditions: s3 > S1 > S2, T3 < T1 < T2, Q3 > Q1 > Q2.
As a further scheme of the invention: the diaphragm small piece-negative small piece-diaphragm small piece-positive small piece are sequentially arranged from bottom to top, and the four layers of units are sequentially folded anticlockwise from the rightmost end to form a unit assembly.
As a further scheme of the invention: the positive pole small pieces are alternately arranged above and below the negative pole small pieces in a penetrating way;
the diaphragm small piece, the negative small piece, the diaphragm small piece and the positive small piece are sequentially arranged from bottom to top, and then the four layers of units are firstly folded clockwise for 180 degrees from the rightmost end and then folded anticlockwise for 180 degrees, so that a unit assembly is sequentially and alternately obtained;
or, the positive electrode small piece, the diaphragm small piece, the negative electrode small piece and the diaphragm small piece are sequentially arranged from bottom to top, and then the four layers of units are sequentially and alternately folded by 180 degrees clockwise and then 180 degrees anticlockwise from the rightmost end to obtain the unit assembly.
As a further scheme of the invention: let the number of negative electrode tabs be M and the number of positive electrode tabs be N, where m=n+1.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional independent diaphragm, the diaphragm is relatively simple in correction and control, and meanwhile, the weight and the space occupation ratio of the diaphragm in the whole battery core can be reduced, and the energy density of the lithium battery is improved; the single unit component is provided with the positive electrode lug and the negative electrode lug respectively, and then a plurality of unit components are stacked, so that the invention only needs to weld a small number of electrode lugs together, and the welding layers are smaller, thereby reducing the risk of welding false welding; the smaller the power of the welding machine is correspondingly, the lower the purchase cost of the welding machine is;
2. after each positive electrode single sheet or each negative electrode single sheet is transferred by the manipulator, a unit assembly can be obtained through clockwise/anticlockwise rotation, and compared with the traditional scheme, the invention directly cancels frequent Z-shaped folding action of the diaphragm and can effectively improve lamination efficiency;
3. according to the invention, the positive minima or the negative minima are connected with each other through the aluminum foil and the copper foil, so that the positive minima or the negative minima are not easy to slide and misplace on the diaphragm, the positioning precision of the lamination can be improved, and the manufacturing qualification rate is improved.
Drawings
FIG. 1 is a schematic view of a negative electrode material strip according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a positive electrode material belt according to an embodiment of the present invention;
FIG. 3 is a schematic view of a negative electrode strip after cutting off excess foil in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a positive electrode strip after cutting off excess foil in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of a negative electrode monolithic structure according to an embodiment of the present invention;
FIG. 6 is a schematic view of a positive electrode monolithic structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an embodiment of the present invention after stacking of a positive electrode monolith, a separator, and a negative electrode monolith;
FIG. 8 is a schematic diagram illustrating the formation of a unit assembly according to an embodiment of the present invention;
fig. 9 is a laminated cell structure according to a first embodiment of the present invention;
FIG. 10 is a schematic diagram of a second embodiment of the present invention in which the positive electrode monolith, separator and negative electrode monolith are stacked;
FIG. 11 is a schematic diagram illustrating the formation of a unit assembly according to a second embodiment of the present invention;
fig. 12 is a laminated cell structure in a second embodiment of the present invention;
FIG. 13 is a schematic view of a third embodiment of the invention in which the positive electrode monolith, separator and negative electrode monolith are stacked;
FIG. 14 is a schematic diagram illustrating the formation of a unit assembly according to a third embodiment of the present invention;
fig. 15 is a laminated cell structure in a third embodiment of the present invention;
reference numerals illustrate: 10. a negative electrode material belt; 101. copper foil; 102. a negative electrode active material; 103. a negative electrode ear; 104. a negative tab; 105. a negative electrode monolithic; 20. a positive electrode material belt; 201. aluminum foil; 202. a positive electrode active material; 203. a positive electrode tab; 204. positive minitablets; 205. a positive electrode monolithic; 30. a diaphragm; 301. a separator platelet; 40. and (3) a unit assembly.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, 2 and 8, a molding apparatus of a laminated battery cell includes at least one unit assembly 40, the unit assembly 40 including a negative electrode material tape 10 and a positive electrode material tape 20 stacked one on top of the other, the negative electrode material tape 10 and the positive electrode material tape 20 being separated by a continuous separator 30.
Fig. 1 is a schematic view of a negative electrode material tape 10 according to the present invention, wherein it should be noted that the negative electrode material tape 10 is formed by coating negative electrode active materials 102 on upper and lower surfaces of a copper foil 101, respectively, and then baking and rolling, and a plurality of negative electrode coating regions are coated on the copper foil 101, wherein the width of the negative electrode coating region is S1, and the interval between adjacent negative electrode coating regions is T1; on the basis of fig. 1, the copper foil 101 is subjected to laser ablation, the cathode material strip 10 after being ablated forms the graph shown in fig. 3, fig. 3 is a schematic view of the cathode material strip 10 after the redundant foil is ablated in the present invention, at this time, each cathode coating area (namely, the cathode tab 104 in fig. 5 in the present application) is connected through the copper foil 101, and the copper foil 101 protruding to the leftmost side is the cathode ear 103.
Fig. 2 is a schematic view of a positive electrode material strip 20 according to the present invention, wherein it should be noted that the positive electrode material strip 20 is formed by coating positive electrode active materials 202 on upper and lower surfaces of an aluminum foil 201, respectively, and then baking and rolling, and a plurality of positive electrode coating regions are coated on the aluminum foil 201, wherein the width of the positive electrode coating region is S2, and the interval between adjacent positive electrode coating regions is T2; on the basis of fig. 2, the aluminum foil 201 is subjected to laser ablation, the positive electrode material strip 20 after being ablated forms the graph shown in fig. 4, fig. 4 is a schematic view of the positive electrode material strip 20 after the redundant foil is ablated in the present invention, at this time, each negative electrode coating area (i.e. the positive electrode tab 204 in fig. 6 in the present application) is connected through the aluminum foil 201, and the aluminum foil 201 extending to the leftmost side is the positive electrode tab 203.
It should be noted that the anode coating region and the cathode coating region satisfy the following conditions: s1 > T1, S2 > T2, S1 > S2, T2 > T1.
Further, on the basis of fig. 3, the negative electrode material tape 10 is continuously cut along the dotted line shown in fig. 3, so as to obtain a negative electrode single sheet 105 shown in fig. 5, where the negative electrode single sheet 105 further includes a plurality of negative electrode micro sheets 104, and the lengths of the negative electrode single sheets 105 are Q1 respectively.
Further, on the basis of fig. 4, the positive electrode material strip 20 is continuously cut along the dotted line shown in fig. 4, so as to obtain a positive electrode single sheet 205 shown in fig. 6, and the positive electrode single sheet 205 further includes a plurality of positive electrode micro sheets 204, wherein the lengths of the positive electrode single sheets 205 are respectively Q2, and the following relationships are satisfied between the two: q1 > Q2.
Referring to fig. 7, a molding process of the unit assembly 40 according to the first embodiment of the present invention is as follows:
the negative electrode single sheet 105 is firstly placed between two layers of diaphragms 30, then the positive electrode single sheet 205 is placed on the upper surface of the uppermost layer of diaphragms 30, the positive electrode lug 203 and the negative electrode lug 103 are both positioned at the leftmost end and extend out of the diaphragms 30, the state shown in the first layer of fig. 8 is formed when the cross-section view is taken in the direction A-A in fig. 7, the positive electrode single sheet 205 is positioned above the negative electrode single sheet 105, the positive electrode tiny sheet 204 is positioned above the negative electrode tiny sheet 104, then four layers of units are sequentially folded from bottom to top to the diaphragm 30-negative electrode tiny sheet 104-diaphragm 30-positive electrode tiny sheet 204, and then the unit assemblies 40 (refer to the final state of the unit assemblies 40 in fig. 8) are finally obtained after the unit assemblies 40 are obtained, the laminated battery cells are obtained by stacking a plurality of unit assemblies 40, and the invention is not limited to the specific number of the unit assemblies 40 corresponding to single laminated battery cells.
Fig. 9 illustrates a laminated cell structure according to a first embodiment of the present invention, i.e., a plurality of unit modules 40 shown in fig. 8 are stacked to complete the fabrication of the laminated cell.
It should be noted that the diaphragm 30 is a continuous diaphragm, and the length Q3 > Q1 > Q2.
It should be noted that the single negative electrode monolithic sheet 105 of the present invention is composed of five negative electrode tabs 104 (here, the number of the negative electrode tabs 104 and the positive electrode tabs 204 is determined according to the actual need, and the present application is not limited thereto), and the single positive electrode monolithic sheet 205 is composed of four positive electrode tabs 204. The present invention is not limited to the number M of the negative electrode tabs 104 corresponding to the single negative electrode tab 105 and the number N of the positive electrode tabs 204 corresponding to the single positive electrode tab 205, but m=n+1 needs to be satisfied.
Example two
Embodiment three is different from embodiment one in that: the separator 30 in the second embodiment is composed of a plurality of separator tabs 301 disposed at equal intervals, and the separator tabs 301 are located between the positive electrode single sheet 205 and the negative electrode single sheet 105.
Wherein let the width of the diaphragm 301 be S3, the length be Q3, the distance between adjacent two be T3, and the following condition is satisfied: s3 > S1 > S2, T3 < T1 < T2, Q3 > Q1 > Q2.
Referring to fig. 10, 11 and 12, a molding process of the unit assembly 40 according to the second embodiment of the present invention is as follows:
firstly, placing a negative electrode single sheet 105 between two layers of diaphragm 30, then placing a positive electrode single sheet 205 on the upper surface of the uppermost layer of diaphragm 30, placing a positive electrode lug 203 and a negative electrode lug 103 which are both positioned at the leftmost end and extend out of the diaphragm 30, specifically, as shown in fig. 10, placing a negative electrode small sheet 104 between two layers of diaphragm small sheets 301, and then placing a positive electrode small sheet 204 above the diaphragm small sheets 301; from the sectional view in the direction B-B in fig. 10, a state shown in fig. 11 is formed, where the positive electrode single sheet 205 is located above the negative electrode single sheet 105, the positive electrode small sheet 204 is located above the negative electrode small sheet 104, then the four layers of units are sequentially from bottom to top, namely, the diaphragm lower sheet 301-the negative electrode small sheet 104-the diaphragm lower sheet 301-the positive electrode small sheet 204, and then sequentially folded counterclockwise from the rightmost end until all the folding is completed, and finally the unit assembly 40 is obtained (refer to the final state of the unit assembly 40 in fig. 11), after the unit assembly 40 is obtained, a plurality of unit assemblies 40 are stacked to obtain a laminated battery cell, and the invention is not limited to a specific number of unit assemblies 40 corresponding to a single laminated battery cell;
fig. 12 is a laminated cell structure in a second embodiment of the present invention, i.e. a plurality of unit assemblies 40 shown in fig. 11 are stacked to complete the fabrication of the laminated cell.
Example III
The separator 30 in the third embodiment is also formed by a plurality of separator tabs 301 disposed at equal intervals, and the separator tabs 301 are located between the positive electrode single sheet 205 and the negative electrode single sheet 105, while the third embodiment differs from the second embodiment in that the positive electrode single sheet 204 is alternately interposed (refer to the illustration of the first layer in fig. 13 and 14).
Referring to fig. 13, 14 and 15, a molding process of the unit assembly 40 according to the third embodiment of the present invention is as follows:
firstly, placing a negative electrode single sheet 105 between two layers of diaphragms 30, then placing a positive electrode single sheet 205 on the upper surface of the uppermost layer of diaphragms 30, wherein positive electrode small sheets 204 in the positive electrode single sheet 205 are alternately arranged above and below the negative electrode small sheets 104 in a penetrating way, namely, diaphragm small sheets 301-negative small sheets 104-diaphragm small sheets 301-positive small sheets 204 are sequentially arranged in four layers of units from bottom to top; or the positive micro sheet 204-the separator micro sheet 301 and the negative micro sheet 104-the separator micro sheet 301 are alternately arranged (specifically, refer to fig. 14, fig. 14 is a schematic view of cross-section in the C-C direction in fig. 13), then four layers of units in the two states are sequentially and alternately folded by 180 degrees clockwise from the rightmost end and then folded by 180 degrees anticlockwise to obtain the unit components 40 (refer to the final state of the unit components 40 in fig. 15), and after obtaining the unit components 40, a plurality of unit components 40 are stacked to obtain laminated cells, and the invention is not limited to the specific number of the unit components 40 corresponding to a single laminated cell.
Fig. 15 shows a laminated cell structure according to a third embodiment of the present invention, in which a plurality of unit modules 40 shown in fig. 14 are stacked to complete the fabrication of the laminated cell.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The forming device of the laminated battery core is characterized by comprising at least one unit assembly (40), wherein the unit assembly (40) comprises a negative electrode material belt (10) and a positive electrode material belt (20) which are stacked up and down, and the negative electrode material belt (10) and the positive electrode material belt (20) are separated by a continuous diaphragm (30);
the negative electrode material belt (10) and the positive electrode material belt (20) are respectively provided with a negative electrode lug (103) and a positive electrode lug (203), a diaphragm (30), the negative electrode material belt (10), the diaphragm (30) and the positive electrode material belt (20) which are stacked up and down are wound to form a unit assembly (40), and a plurality of unit assemblies (40) are stacked and welded.
2. The device for forming laminated cells of claim 1, wherein: the negative electrode material belt (10) comprises a negative electrode single sheet (105), the negative electrode single sheet (105) comprises a plurality of negative electrode tiny sheets (104), the negative electrode tiny sheets (104) are connected through copper foils (101), and the copper foil (101) extending to the leftmost side is a negative electrode lug (103);
the positive electrode material belt (20) is provided with a positive electrode single sheet (205), the positive electrode single sheet (205) comprises a plurality of positive electrode tiny sheets (204), each positive electrode tiny sheet (204) is connected through an aluminum foil (201), and the aluminum foil (201) extending to the leftmost side is a positive electrode lug (203).
3. The device for forming laminated cells of claim 2, wherein: the width of each negative electrode small piece (104) is S1, and the interval between every two adjacent negative electrode small pieces (104) is T1; the width of each positive tiny sheet (204) is S2, and the interval between adjacent positive tiny sheets (204) is T2;
wherein S1 > T1, S2 > T2, S1 > S2, T2 > T1.
4. A laminated cell molding apparatus as claimed in claim 3, wherein: the lengths of the negative electrode single chip (105), the positive electrode single chip (205) and the diaphragm (30) are respectively Q1, Q2 and Q3, wherein Q3 is more than Q1 and more than Q2.
5. The device for forming laminated cells of claim 4, wherein: the separator (30) -the cathode small piece (104) -the separator (30) -the anode small piece (204) are sequentially arranged from bottom to top, and the four layers of units are sequentially folded from the rightmost end anticlockwise to form a unit assembly (40).
6. A laminated cell molding apparatus as claimed in claim 3, wherein: the separator (30) comprises a plurality of separator small pieces (301), and the plurality of separator small pieces (301) are paved between the cathode small pieces (104) and the anode small pieces (204).
7. The device for forming laminated cells of claim 6, wherein: the width of the diaphragm small piece (301) is S3, the length of the diaphragm small piece is Q3, and the distance between the diaphragm small piece and the diaphragm small piece is T3;
and satisfies the following conditions: s3 > S1 > S2, T3 < T1 < T2, Q3 > Q1 > Q2.
8. The device for forming laminated cells of claim 7, wherein: the separator small piece (301) -the cathode small piece (104) -the separator small piece (301) -the anode small piece (204) are sequentially arranged from bottom to top, and the four layers of units are sequentially folded from the rightmost end anticlockwise to form a unit assembly (40).
9. The device for forming laminated cells of claim 6, wherein: the positive electrode small pieces (204) are alternately arranged above and below the negative electrode small pieces (104) in a penetrating way;
the diaphragm small piece (301) -the cathode small piece (104) -the diaphragm small piece (301) -the anode small piece (204) are sequentially placed from bottom to top, and then the four layers of units are sequentially and alternately folded by 180 degrees clockwise and then 180 degrees anticlockwise from the rightmost end to obtain a unit assembly (40);
or, the positive electrode small piece (204), the diaphragm small piece (301), the negative electrode small piece (104) and the diaphragm small piece (301) are sequentially placed from bottom to top, and then the four layers of units are sequentially and alternately folded by 180 degrees clockwise and then 180 degrees anticlockwise from the rightmost end, so that the unit assembly (40) is obtained.
10. A laminated cell molding apparatus as claimed in claim 3, wherein: let the number of negative electrode tabs (104) be M and the number of positive electrode tabs (204) be N, where m=n+1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410051819.4A CN117878430A (en) | 2024-01-12 | 2024-01-12 | Forming device of lamination battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410051819.4A CN117878430A (en) | 2024-01-12 | 2024-01-12 | Forming device of lamination battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117878430A true CN117878430A (en) | 2024-04-12 |
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ID=90580730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410051819.4A Pending CN117878430A (en) | 2024-01-12 | 2024-01-12 | Forming device of lamination battery cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117878430A (en) |
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2024
- 2024-01-12 CN CN202410051819.4A patent/CN117878430A/en active Pending
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