CN113594533A - Battery cell, preparation method and system thereof and secondary battery - Google Patents
Battery cell, preparation method and system thereof and secondary battery Download PDFInfo
- Publication number
- CN113594533A CN113594533A CN202110887177.8A CN202110887177A CN113594533A CN 113594533 A CN113594533 A CN 113594533A CN 202110887177 A CN202110887177 A CN 202110887177A CN 113594533 A CN113594533 A CN 113594533A
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- positive
- material belt
- plate
- negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
-
- 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
-
- 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
Abstract
The invention relates to the technical field of batteries, in particular to a battery cell, a preparation method and a system thereof and a secondary battery. The battery core is obtained by the composite material belt according to a Z-shaped folding mode; the composite material belt is formed by compounding at least two single material belts; the single material belt comprises a diaphragm, one surface of the diaphragm is provided with a plurality of positive plates at intervals along the length direction, and a first blank area is formed between every two adjacent positive plates; a plurality of negative plates are arranged on the other surface of the diaphragm at intervals along the length direction, and a second blank area is formed between every two adjacent negative plates; the positive plate is opposite to the second blank area, and the negative plate is opposite to the first blank area; in the composite material belt, one surface of any diaphragm is connected with a positive plate, the other surface of the diaphragm is a negative plate, the negative plate forms a negative plate material belt between adjacent diaphragms, and the positive plate forms a positive plate material belt between adjacent diaphragms; the Z-shaped kinking position of the battery cell is a first blank area or a second blank area. Above-mentioned electric core can avoid the diaphragm fold problem, and the structure is more stable.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell, a preparation method and a system thereof and a secondary battery.
Background
With the growth of the power battery industry, the demand of lithium secondary batteries has increased dramatically. The current lithium secondary battery is mainly divided into a square soft package, a square aluminum shell and a cylindrical battery, wherein the square soft package and the square aluminum shell battery can be stacked in order, so that the possibility is provided for the realization of technologies such as a high-energy-density battery Pack and a CTP (Cell To Pack, a highly integrated power battery development platform). The square battery has two process routes of lamination and winding at present, the energy density of square winding cannot be substantially improved due to insufficient utilization of corner space, the diaphragm of the existing laminated battery is easily wrinkled during lamination, the core pulling of a claw during lamination easily causes scratch of the diaphragm, and the battery is easily distorted during vibration and extrusion from the outside, generates heat or catches fire and the like.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
According to one aspect of the invention, the invention relates to a battery cell, which is obtained by folding a composite material belt in a Z-shaped manner; the composite material belt is formed by compounding at least two single material belts;
the single material belt comprises a diaphragm, a plurality of positive plates arranged on one side of the diaphragm and a plurality of negative plates arranged on the other side of the diaphragm, the positive plates are arranged at intervals along the length direction of the diaphragm, and a first blank area is formed between every two adjacent positive plates; the negative electrode plates are arranged on the other surface of the diaphragm opposite to the positive electrode plate at intervals along the length direction, and a second blank area is formed between every two adjacent negative electrode plates; the positive plate is opposite to the second blank area, and the negative plate is opposite to the first blank area;
in the composite material belt obtained by compounding the single material belts, one surface of any diaphragm is connected with the positive plate, and the other surface of the diaphragm is connected with the negative plate; the negative electrode sheet forms a negative electrode sheet material belt between two adjacent diaphragms, and/or the positive electrode sheet forms a positive electrode sheet material belt between two adjacent diaphragms; the Z-shaped kinking position of the battery cell is the first blank area or the second blank area.
The battery cell can avoid the problem of diaphragm wrinkling, has a more stable structure, has better stability when being impacted by external force or violently vibrated, and is more difficult to heat up and ignite.
According to another aspect of the invention, the invention also relates to a preparation method of the battery cell, which comprises the following steps:
stacking at least two single material belts, and integrating to obtain a composite material belt; folding the composite material belt according to a Z-shaped folding mode; the single material belt is obtained by respectively carrying out thermal compounding on the negative plate and the positive plate and the diaphragm.
The preparation method of the battery cell is simple, feasible and efficient.
According to another aspect of the invention, the invention also relates to a system for implementing the method for preparing the battery cell, which comprises an integration device and at least two single material belt preparation devices;
the single material belt preparation device comprises a positive plate feeding assembly for providing a positive plate coiled material, a negative plate feeding assembly for providing a negative plate coiled material, a diaphragm feeding assembly for providing a diaphragm, a hot pressing device and a cutting device;
the positive plate feeding assembly and the negative plate feeding assembly are respectively arranged at the upper part and the lower part of the diaphragm feeding assembly; the cutting device is used for cutting the anode sheet coiled material into a plurality of anode sheet single sheets and attaching the anode sheet coiled material to one surface of the diaphragm, and cutting the cathode sheet coiled material into a plurality of cathode sheet single sheets and attaching the cathode sheet coiled material to the other surface of the diaphragm;
the hot-pressing device is used for respectively compounding the single positive plate and the single negative plate with the diaphragm to obtain a single material belt;
the integrating device is used for integrating a plurality of single material belts to obtain the composite material belt.
The system is used for preparing the battery cell, is simple and feasible, and improves the production efficiency and the quality of the battery cell.
According to another aspect of the invention, the invention also relates to a secondary battery comprising a cell as described above.
The secondary battery of the present invention has excellent stability and electrochemical properties.
Compared with the prior art, the invention has the beneficial effects that:
(1) the battery cell can completely avoid the problem of diaphragm wrinkling, has a more stable structure, has better stability when being impacted by external force or violently vibrated, and is less prone to temperature rise and fire.
(2) The method is simple and easy to implement, and can realize high-speed production.
(3) The system is used for preparing the battery cell, and can improve the production efficiency and the quality of the battery cell.
(4) The secondary battery prepared by the battery core can improve the stability and the electrochemical performance of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a battery cell obtained in example 1;
fig. 2 is a schematic view of two single tapes of example 1;
FIG. 3 is a schematic view of a three-layer single-ply tape of example 3;
fig. 4 is a schematic view of a three-layer composite tape in example 3;
FIG. 5 is a schematic view of a system in example 1;
fig. 6 is a flow chart of a cell preparation process in embodiment 2.
Reference numerals:
1-first single material belt, 1-1-first positive plate, 1-2-first diaphragm, 1-3-first negative plate, 2-second single material belt, 2-1 second negative plate, 2-2-second diaphragm, 2-3-second positive plate, 3-third single material belt, 3-1-third positive plate, 3-2-third diaphragm, 3-third negative plate, 4-first single material belt preparation device, 4-1-first negative plate supply component, 4-2-first diaphragm supply component, 4-3-first positive plate supply component, 4-4 first hot pressing device, 4-5-first negative plate cutting device, 4-6-first positive plate cutting device, 5-a second single material belt preparation device, 5-1-a second negative plate supply assembly, 5-2-a second diaphragm supply assembly, 5-3-a second positive plate supply assembly, 5-4-a second hot-pressing device, 5-5-a second negative plate cutting device, 5-6-a second positive plate cutting device, 6-an integration device, 7-a first auxiliary rod and 8-a second auxiliary rod.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to one aspect of the invention, the invention relates to a battery cell, which is obtained by folding a composite material belt in a Z-shaped manner; the composite material belt is formed by compounding at least two single material belts;
the single material belt comprises a diaphragm, a plurality of positive plates arranged on one side of the diaphragm and a plurality of negative plates arranged on the other side of the diaphragm, the positive plates are arranged at intervals along the length direction of the diaphragm, and a first blank area is formed between every two adjacent positive plates; the negative electrode plates are arranged on the other surface of the diaphragm opposite to the positive electrode plate at intervals along the length direction, and a second blank area is formed between every two adjacent negative electrode plates; the positive plate is opposite to the second blank area, and the negative plate is opposite to the first blank area;
in the composite material belt obtained by compounding the single material belts, one surface of any diaphragm is connected with the positive plate, and the other surface of the diaphragm is connected with the negative plate; the negative electrode sheet forms a negative electrode sheet material belt between two adjacent diaphragms, and/or the positive electrode sheet forms a positive electrode sheet material belt between two adjacent diaphragms; the Z-shaped kinking position of the battery cell is the first blank area or the second blank area.
According to the invention, the single-layer long-sheet rolled diaphragm and the single positive electrode or single negative electrode sheet are bonded together and then laminated, so that the problem of diaphragm wrinkling can be completely avoided, the cell structure is more stable, the stability of the cell is better when the cell is impacted by external force or violently vibrated, and the cell is less prone to temperature rise and fire; the high-speed production of the battery cell is easier to realize.
Preferably, in the battery cell, the positive electrode plate or the negative electrode plate is wrapped in the diaphragm.
The diaphragm is only cut at the initial position and the end position of the battery cell, and is not cut in the middle; the outmost layer is wrapped by a diaphragm, and the pole piece does not leak.
Preferably, when the composite material belt is formed by compounding a first single material belt and a second single material belt, a surface of the first single material belt on which the plurality of first negative electrode pieces are arranged is compounded opposite to a surface of the second single material belt on which the plurality of second negative electrode pieces are arranged;
preferably, in the composite material belt, the first negative electrode plate is located in a central area of a blank area between two adjacent second negative electrode plates, and the second negative electrode plate is located in a central area of a blank area between two adjacent first negative electrode plates.
In one embodiment, the outermost pole pieces are all negative pole pieces, so that the number of the negative pole pieces is always one more than that of the positive pole pieces in one cell. One surface of each pole piece is bonded with the diaphragm before integration and hot pressing, the other surface of each pole piece is not bonded, and all the pole pieces are bonded after integration and hot pressing. Two layers of diaphragms are folded together at the diaphragm folding angle positions, and a positive plate is always wrapped between the two layers of diaphragms corresponding to the inner side folding angles.
Preferably, at least one surface of the positive electrode sheet is provided with a positive electrode material layer.
Preferably, the two side surfaces of the positive plate are provided with positive electrode material layers.
Preferably, at least one surface of the negative electrode sheet is provided with a negative electrode material layer.
Preferably, the surfaces of both sides of the negative plate are provided with negative electrode material layers.
According to another aspect of the invention, the invention also relates to a method for preparing a cell as described above, comprising the following steps:
stacking at least two single material belts, and integrating to obtain a composite material belt; folding the composite material belt according to a Z-shaped folding mode; the single material belt is obtained by respectively carrying out thermal compounding on the negative plate and the positive plate and the diaphragm.
The preparation method of the battery cell is simple and easy to implement, the efficiency is high, and the obtained product has high quality.
The preparation method of the battery cell specifically comprises the following steps:
(a) preparing a single material belt: cutting the positive plate material belt into a plurality of same positive plate single sheets, and then thermally compounding the positive plate single sheets with the diaphragm to form the positive plate material belt with equal intervals on one side surface of the diaphragm along the length direction of the diaphragm, wherein a first blank area is formed between any two adjacent positive plates in the positive plate material belt; cutting the negative pole piece material belt into a plurality of same negative pole piece single sheets, and then carrying out thermal compounding with the diaphragm, forming the negative pole piece material belt with equal intervals on the other side surface of the diaphragm along the length direction of the diaphragm, wherein a second blank area is formed between any two adjacent positive pole pieces in the negative pole piece material belt;
(b) preparing the composite material belt: compounding at least two single material belts in a laminating mode, wherein in the compounding process, the surfaces of the single material belts, which are the positive plates, or the surfaces of the single material belts, which are the negative plates, are oppositely compounded; in the contact surface of any two single material belts after compounding, the positive plate on the single material belt is positioned in the central area of the blank area between the positive plates in the adjacent single material belts, and the negative plate on the single material belt is positioned in the central area of the blank area between the negative plates in the adjacent single material belts.
(c) Folding the composite material belt according to a Z shape, wherein a folding position is a blank area; in the folded battery cell, all the positive plates and the negative plates are wrapped in the diaphragm.
According to another aspect of the invention, the invention also relates to a system for implementing the method for preparing the battery cell, which comprises an integration device and at least two single material belt preparation devices;
the single material belt preparation device comprises a positive plate feeding assembly for providing a positive plate coiled material, a negative plate feeding assembly for providing a negative plate coiled material, a diaphragm feeding assembly for providing a diaphragm, a hot pressing device and a cutting device;
the positive plate feeding assembly and the negative plate feeding assembly are respectively arranged at the upper part and the lower part of the diaphragm feeding assembly; the cutting device is used for cutting the anode sheet coiled material into a plurality of anode sheet single sheets and attaching the anode sheet coiled material to one surface of the diaphragm, and cutting the cathode sheet coiled material into a plurality of cathode sheet single sheets and attaching the cathode sheet coiled material to the other surface of the diaphragm;
the hot-pressing device is used for respectively compounding the single positive plate and the single negative plate with the diaphragm to obtain a single material belt;
the integrating device is used for integrating a plurality of single material belts to obtain the composite material belt.
The battery core is prepared by adopting the system, the problem of diaphragm wrinkling can be completely avoided, the battery core structure is more stable, temperature rise and fire are not easy to occur, and the production efficiency is improved.
According to the specific number of single material belts, in one embodiment, the positive plate feeding assembly is positioned at the lower part of the diaphragm feeding assembly, and the negative plate feeding assembly is positioned at the upper part of the diaphragm feeding assembly; and/or the positive plate feeding assembly is positioned at the upper part of the diaphragm feeding assembly, and the negative plate feeding assembly is positioned at the lower part of the diaphragm feeding assembly. In the system of the invention, the position relationship among the positive plate feeding assembly, the diaphragm feeding assembly and the negative plate feeding assembly should satisfy: and enabling the surfaces of the obtained single material belts with the same electrodes to face each other and compounding.
Preferably, an auxiliary device is also included.
Preferably, the auxiliary device is an auxiliary lever.
The auxiliary device is arranged to assist the Z-shaped folding of the composite material belt. The composite tape can also be Z-shaped stacked by free fall.
Preferably, the system comprises an integrating device, a first single-web preparation device, a second single-web preparation device, a first auxiliary bar and a second auxiliary bar; the first single material belt preparation device comprises a first positive plate feeding assembly, a first negative plate feeding assembly, a first diaphragm feeding assembly, a first hot pressing device, a first positive plate cutting device and a first negative plate cutting device; the second single material belt preparation device comprises a second positive plate feeding assembly, a second negative plate feeding assembly, a second diaphragm feeding assembly, a second hot-pressing device, a second positive plate cutting device and a second negative plate cutting device.
The process for compounding two single material belts adopts the system, wherein the first membrane is supplied to the first membrane coiled material by the first membrane supply assembly; the first positive plate feeding assembly provides a positive plate coiled material, the coiled material is cut by a first positive plate cutting device, the obtained first positive plate single sheet is subjected to hot-pressing compounding with one surface of a first diaphragm, and first positive plate material belts with equal intervals are formed on one surface of the first diaphragm; the first negative plate supply assembly provides a negative plate coiled material, the negative plate coiled material is cut by the first negative plate cutting device, the obtained first negative plate single sheet and the other surface of the first diaphragm are subjected to hot-pressing compounding, and first negative plate material belts with equal intervals are formed on the first diaphragm; the method obtains a first single material belt; meanwhile, the second diaphragm is provided by the second film supply assembly, the second positive plate feeding assembly provides a positive plate coiled material, the positive plate coiled material is cut by the second positive plate cutting device, the obtained second positive plate single sheet and one surface of the second diaphragm are subjected to hot-pressing compounding, and second positive plate material belts with equal intervals are formed on one surface of the second diaphragm; the second negative plate supply assembly provides a negative plate coiled material, the negative plate coiled material is cut by a second negative plate cutting device, the obtained second negative plate single sheet is subjected to hot-pressing compounding with the other surface of the second diaphragm, and a second negative plate material belt with equal spacing is formed on the other surface of the second diaphragm; the second single material belt is obtained by the method; meanwhile, the negative pole sheet surface of the first single material belt is opposite to the negative pole sheet surface of the second single material belt, so that the second negative pole sheet of the second single material belt is opposite to the central area of the blank area between the adjacent negative poles on the first single material belt, and the first negative pole sheet of the first single material belt is opposite to the central area of the blank area between the adjacent negative poles on the second single material belt; after the second single material belt is attached, an integration device is adopted for integration; and then the Z-shaped stacking is carried out through the free falling body, and the first auxiliary rod and the second auxiliary rod which are arranged on two sides of the composite material belt are used for assisting in stacking in the stacking process.
According to another aspect of the invention, the invention also relates to a secondary battery comprising a cell as described above.
The secondary battery of the invention has good safety and high stability.
The invention will be further explained with reference to specific examples.
Example 1
A battery core is obtained by a composite material belt in a Z-shaped folding mode; the composite material belt is formed by compounding a first single material belt 1 and a second single material belt 2;
the first single material belt 1 comprises a first diaphragm 1-2, a plurality of first positive plates 1-1 are arranged on one surface of the first diaphragm 1-2 at intervals along the length direction, and a first blank area is formed between every two adjacent first positive plates 1-1; a plurality of first negative electrode plates 1-3 are arranged on the other surface of the first diaphragm 1-2 at intervals along the length direction, and a second blank area is formed between every two adjacent first negative electrode plates 1-3; the first positive plate 1-1 is opposite to the second blank area, and the first negative plate 1-3 is opposite to the first blank area;
the second single material belt 2 comprises a second diaphragm 2-2, one surface of the second diaphragm 2-2 is provided with a plurality of second positive plates 2-3 at intervals along the length direction, and a third blank area is formed between every two adjacent second positive plates 2-3; a plurality of second negative electrode sheets 2-1 are arranged on the other surface of the second diaphragm 2-2 at intervals along the length direction, and a fourth blank area is formed between every two adjacent second negative electrode sheets 2-1; the second positive plate 2-3 is opposite to the fourth blank area, and the second negative plate 2-1 is opposite to the third blank area;
compounding the surface of the first single material belt 1 provided with the negative pole pieces with the surface of the second single material belt 2 provided with the negative pole pieces oppositely; after compounding, the first negative plate 1-3 is positioned in the central area of the fourth blank area to form a negative plate material belt; the second negative plate 2-1 is positioned in the central area of the second blank area;
the Z-shaped kinking position of the battery cell is a blank area, and the first positive plate 1-1, the first negative plate 1-3, the second positive plate 2-3 and the second negative plate 2-1 are all wrapped in the diaphragm; the pole pieces at the two ends of the battery cell are both negative pole pieces;
the structure schematic diagram of the battery cell is shown in fig. 1; a schematic of a single strip of material is shown in figure 2.
Example 2
The system adopted for preparing the battery core of embodiment 1 comprises an integration device 6, a first single-material-tape preparation device 4, a second single-material-tape preparation device 5, a first auxiliary rod 7 and a second auxiliary rod 8; the first single material belt 1 preparation device comprises a first positive plate feeding assembly 4-3, a first negative plate feeding assembly 4-1, a first diaphragm feeding assembly 4-2, a first hot pressing device 4-4, a first positive plate cutting device 4-6 and a first negative plate cutting device 4-5; the second single material belt preparation device 5 comprises a second positive plate feeding assembly 5-3, a second negative plate feeding assembly 5-1, a second diaphragm feeding assembly 5-2, a second hot pressing device 5-4, a second positive plate cutting device 5-6 and a second negative plate cutting device 5-5;
a method of making the cell of embodiment 1, comprising the steps of:
respectively feeding materials by adopting a first positive plate feeding assembly 4-3, a first negative plate feeding assembly 4-1 and a first diaphragm feeding assembly 4-2, respectively cutting the first positive plate 1-1 and the first negative plate 1-3 by adopting a first positive plate cutting device 4-6 and a first negative plate cutting device 4-5, respectively bonding the first positive plate 1-1 and the first negative plate 1-3 together by a first hot-pressing device, and enabling the first positive plate 1-1 and the first negative plate 1-3 to be alternately distributed on two sides of the first diaphragm 1-2 to obtain a first single material belt 1; meanwhile, a second positive plate feeding assembly 5-3, a second negative plate feeding assembly 5-1 and a second diaphragm feeding assembly 5-2 are used for feeding materials respectively, a second positive plate 2-3 and a second negative plate 2-1 are cut by a second positive plate cutting device 5-6 and a second negative plate 5-5 respectively, and are bonded with the second diaphragm 2-2 through a second hot-pressing device 5-4 respectively, so that the second positive plate 2-3 and the second negative plate 2-1 are alternately distributed on two sides of the second diaphragm 2-2, and a second single material belt 2 is obtained; the negative electrode surface of the first single material belt 1 is opposite to the negative electrode surface of the second single material belt 2, so that the first negative electrode sheet 1-3 is positioned in the central area of the blank area of the negative electrode surface of the first single material belt 1, and the second negative electrode sheet 2-1 is positioned in the central area of the blank area of the negative electrode surface of the first single material belt; and integrate through the integration device, pile up according to the Z type through the cooperation of the first auxiliary rod and the second auxiliary rod of compound material area both sides, cut the diaphragm after piling up the completion.
A schematic diagram of a system adopted for preparing a battery cell in this embodiment is shown in fig. 5;
a flow chart of a cell preparation process in this embodiment is shown in fig. 6.
Example 3
A battery core is obtained by a composite material belt in a Z-shaped folding mode; the composite material belt is formed by compounding a first single material belt 1, a second single material belt 2 and a third single material belt 3;
the first single material belt 1 comprises a first diaphragm 1-2, one surface of the first diaphragm 1-2 is provided with a plurality of first positive plates 1-1 at intervals along the length direction, and a first blank area is formed between every two adjacent first positive plates 1-1; a plurality of first negative electrode plates 1-3 are arranged on the other surface of the first diaphragm 1-2 at intervals along the length direction, and a second blank area is formed between every two adjacent first negative electrode plates 1-3; the first positive plate 1-1 is opposite to the second blank area, and the first negative plate 1-3 is opposite to the first blank area;
the second single material belt 2 comprises a second diaphragm 2-2, one surface of the second diaphragm 2-2 is provided with a plurality of second positive plates 2-3 at intervals along the length direction, and a third blank area is formed between every two adjacent second positive plates 2-3; a plurality of second negative electrode pieces 2-1 are arranged on the other surface of the second diaphragm 2-2 at intervals along the length direction, and a fourth blank area is formed between every two adjacent second negative electrode pieces 2-1; the second positive plate 2-3 is opposite to the fourth blank area, and the second negative plate 2-1 is opposite to the third blank area;
the third single material belt 3 comprises a second diaphragm 2-2, one surface of the third diaphragm 3-2 is provided with a plurality of third positive plates 3-1 at intervals along the length direction, and a fifth blank area is formed between every two adjacent third positive plates 3-1; a plurality of third negative electrode sheets 3-3 are arranged on the other surface of the third diaphragm 3-2 at intervals along the length direction, and a sixth blank area is formed between every two adjacent third negative electrode sheets 3-3; the third positive plate 3-1 is opposite to the sixth blank area, and the third negative plate 3-3 is opposite to the fifth blank area;
the surface of the first single material belt 1 provided with the negative pole pieces is opposite to the surface of the second single material belt 2 provided with the negative pole pieces, and the surface of the second single material belt 2 provided with the positive pole is opposite to the surface of the third single material belt 3 provided with the positive pole, and compounding is carried out; after compounding, the first negative plate 1-3 is located in the central area of the fourth blank area, the second negative plate 2-1 is located in the central area of the second blank area to form a negative plate material belt, the second positive plate 2-3 is located in the central area of the fifth blank area, and the third positive plate 3-1 is the central area of the third blank area to form a positive plate material belt;
the Z-shaped kinking position of the battery cell is a blank area, and all the positive plates and the negative plates are wrapped in the diaphragm.
A schematic of a three-layer strand belt of this example is shown in fig. 3;
a schematic diagram of the three-layer composite material tape in this embodiment is shown in fig. 4.
Example 4
The method for preparing a cell of embodiment 3, comprising the steps of:
respectively cutting the first positive plate 1-1 and the first negative plate 1-3, and respectively bonding the cut first positive plate 1-1 and the cut first negative plate 1-3 with the first diaphragm 1-2 through hot pressing, so that the first positive plate 1-1 and the first negative plate 1-3 are respectively arranged on two sides of the first diaphragm 1-2 and are alternately distributed to obtain a first single material belt 1; meanwhile, the second positive plate 2-3 and the second negative plate 2-1 are respectively cut, and then the cut second positive plate 2-3 and the second negative plate 2-1 are respectively bonded with the second diaphragm 2-2 through hot pressing, so that the second positive plate 2-3 and the second negative plate 2-1 are respectively arranged on two sides of the second diaphragm 2-2 and are alternately distributed to obtain a second single material belt 2; meanwhile, the third positive plate 3-1 and the third negative plate 3-3 are respectively cut, and then the cut third positive plate 3-1 and the third negative plate 3-3 are respectively bonded with the third diaphragm 3-2 through hot pressing, so that the third positive plate 3-1 and the third negative plate 3-3 are respectively arranged on two sides of the third diaphragm 3-2 and are alternately distributed to obtain a third single material belt 3;
the negative pole face in first list material area 1 is relative with the negative pole piece in second list material area 2, and the positive pole face in second list material area 2 is relative with the positive pole face in third list material area 3 to integrate through the integration device, pile up according to the Z type through the cooperation of first auxiliary rod and the second auxiliary rod of compound material area both sides, pile up and decide the diaphragm after accomplishing.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery core is characterized in that the battery core is obtained by a composite material belt in a Z-shaped folding mode; the composite material belt is formed by compounding at least two single material belts;
the single material belt comprises a diaphragm, a plurality of positive plates arranged on one side of the diaphragm and a plurality of negative plates arranged on the other side of the diaphragm, the positive plates are arranged at intervals along the length direction of the diaphragm, and a first blank area is formed between every two adjacent positive plates; the negative electrode plates are arranged on the other surface of the diaphragm opposite to the positive electrode plate at intervals along the length direction, and a second blank area is formed between every two adjacent negative electrode plates; the positive plate is opposite to the second blank area, and the negative plate is opposite to the first blank area;
in the composite material belt obtained by compounding the single material belts, one surface of any diaphragm is connected with the positive plate, and the other surface of the diaphragm is connected with the negative plate; the negative electrode sheet forms a negative electrode sheet material belt between two adjacent diaphragms, and/or the positive electrode sheet forms a positive electrode sheet material belt between two adjacent diaphragms; the Z-shaped kinking position of the battery cell is the first blank area or the second blank area.
2. The battery cell of claim 1, wherein when the composite material tape is formed by combining a first single material tape and a second single material tape, a surface of the first single material tape on which the plurality of first negative electrode pieces are arranged is opposite to a surface of the second single material tape on which the plurality of second negative electrode pieces are arranged.
3. The battery cell of claim 2, wherein in the composite material tape, the first negative electrode plate is located in a central area of a blank area between two adjacent second negative electrode plates, and the second negative electrode plate is located in a central area of a blank area between two adjacent first negative electrode plates.
4. The battery cell of claim 1, wherein the positive electrode sheet or the negative electrode sheet is wrapped in the separator.
5. The cell of claim 1, wherein at least one surface of the positive electrode sheet is provided with a positive electrode material layer.
6. The battery cell of claim 1, wherein at least one surface of the negative electrode sheet is provided with a negative electrode material layer.
7. The method for preparing the battery cell of any one of claims 1 to 6, comprising the following steps:
stacking at least two single material belts, and integrating to obtain a composite material belt; folding the composite material belt according to a Z-shaped folding mode; the single material belt is obtained by respectively carrying out thermal compounding on the negative plate and the positive plate and the diaphragm.
8. The system for implementing the method for preparing a battery cell of claim 7, comprising an integration device and at least two single-material tape preparation devices;
the single material belt preparation device comprises a positive plate feeding assembly for providing a positive plate coiled material, a negative plate feeding assembly for providing a negative plate coiled material, a diaphragm feeding assembly for providing a diaphragm, a hot pressing device and a cutting device;
the positive plate feeding assembly and the negative plate feeding assembly are respectively arranged at the upper part and the lower part of the diaphragm feeding assembly; the cutting device is used for cutting the anode sheet coiled material into a plurality of anode sheet single sheets and attaching the anode sheet coiled material to one surface of the diaphragm, and cutting the cathode sheet coiled material into a plurality of cathode sheet single sheets and attaching the cathode sheet coiled material to the other surface of the diaphragm;
the hot-pressing device is used for respectively compounding the single positive plate and the single negative plate with the diaphragm to obtain a single material belt;
the integrating device is used for integrating a plurality of single material belts to obtain the composite material belt.
9. The system of claim 8, further comprising an auxiliary device;
preferably, the auxiliary device is an auxiliary lever.
10. A secondary battery comprising the battery cell of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110887177.8A CN113594533A (en) | 2021-08-03 | 2021-08-03 | Battery cell, preparation method and system thereof and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110887177.8A CN113594533A (en) | 2021-08-03 | 2021-08-03 | Battery cell, preparation method and system thereof and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113594533A true CN113594533A (en) | 2021-11-02 |
Family
ID=78254569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110887177.8A Pending CN113594533A (en) | 2021-08-03 | 2021-08-03 | Battery cell, preparation method and system thereof and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113594533A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583284A (en) * | 2022-03-08 | 2022-06-03 | 蜂巢能源科技股份有限公司 | Lamination equipment |
| CN115275370A (en) * | 2022-08-26 | 2022-11-01 | 楚能新能源股份有限公司 | Laminated battery cell production process and equipment |
| CN116259853A (en) * | 2023-05-11 | 2023-06-13 | 中创新航科技集团股份有限公司 | Battery cell |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129478A (en) * | 2016-08-17 | 2016-11-16 | 惠州市豪鹏科技有限公司 | A kind of lamination type electric pool structure, the secondary battery including it and battery module |
| CN109244554A (en) * | 2018-09-21 | 2019-01-18 | 江苏卡耐新能源有限公司 | A kind of lithium ion battery zigzag laminating equipment and its technique |
| CN109301349A (en) * | 2018-09-12 | 2019-02-01 | 深圳市海目星激光智能装备股份有限公司 | A kind of lamination process and lamination device |
| CN110459796A (en) * | 2019-08-16 | 2019-11-15 | 深圳吉阳智能科技有限公司 | A kind of preparation method of laminated cell, laminated cell, lamination device and system |
| CN111430773A (en) * | 2020-04-30 | 2020-07-17 | 蜂巢能源科技有限公司 | Method for manufacturing electrode laminated assembly, and electrode laminating apparatus |
| CN112563551A (en) * | 2019-09-26 | 2021-03-26 | 无锡先导智能装备股份有限公司 | Battery cell winding equipment and battery cell winding method |
| CN113036229A (en) * | 2021-03-12 | 2021-06-25 | 深圳吉阳智能科技有限公司 | Composite lamination process |
-
2021
- 2021-08-03 CN CN202110887177.8A patent/CN113594533A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129478A (en) * | 2016-08-17 | 2016-11-16 | 惠州市豪鹏科技有限公司 | A kind of lamination type electric pool structure, the secondary battery including it and battery module |
| CN109301349A (en) * | 2018-09-12 | 2019-02-01 | 深圳市海目星激光智能装备股份有限公司 | A kind of lamination process and lamination device |
| CN109244554A (en) * | 2018-09-21 | 2019-01-18 | 江苏卡耐新能源有限公司 | A kind of lithium ion battery zigzag laminating equipment and its technique |
| CN110459796A (en) * | 2019-08-16 | 2019-11-15 | 深圳吉阳智能科技有限公司 | A kind of preparation method of laminated cell, laminated cell, lamination device and system |
| WO2021031287A1 (en) * | 2019-08-16 | 2021-02-25 | 宁德时代新能源科技股份有限公司 | Preparation method for laminated battery cell, laminated battery cell, and lamination device and system |
| CN112563551A (en) * | 2019-09-26 | 2021-03-26 | 无锡先导智能装备股份有限公司 | Battery cell winding equipment and battery cell winding method |
| CN111430773A (en) * | 2020-04-30 | 2020-07-17 | 蜂巢能源科技有限公司 | Method for manufacturing electrode laminated assembly, and electrode laminating apparatus |
| CN113036229A (en) * | 2021-03-12 | 2021-06-25 | 深圳吉阳智能科技有限公司 | Composite lamination process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583284A (en) * | 2022-03-08 | 2022-06-03 | 蜂巢能源科技股份有限公司 | Lamination equipment |
| CN115275370A (en) * | 2022-08-26 | 2022-11-01 | 楚能新能源股份有限公司 | Laminated battery cell production process and equipment |
| CN116259853A (en) * | 2023-05-11 | 2023-06-13 | 中创新航科技集团股份有限公司 | Battery cell |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113594533A (en) | Battery cell, preparation method and system thereof and secondary battery | |
| CN101405911B (en) | Multi-layered type electrochemistry cell of improved safety | |
| KR101014817B1 (en) | stack/folding-typed Electrode Assembly Containing Safety Member and Process for Preparation of the Same | |
| JP6859059B2 (en) | Lithium-ion secondary battery and its manufacturing method | |
| US7498099B2 (en) | Film covered battery | |
| CN104900905A (en) | Laminated lithium ion battery and production process thereof | |
| TWI502787B (en) | Electrode assembly, fabricating method of electrode assembly and electrochemical cell containing the electrode assembly | |
| WO2011002064A1 (en) | Laminated battery | |
| CN113594532B (en) | Battery cell, preparation method and system thereof, and secondary battery | |
| US9614248B2 (en) | Stack-folding type electrode assembly and method of manufacturing the same | |
| CN210443627U (en) | Bendable and foldable battery core and battery | |
| TW201419628A (en) | Electrode assembly, fabricating method of electrode assembly and electrochemical cell containing the electrode assembly | |
| CN112599935A (en) | Lithium ion power soft package battery tab and manufacturing method of battery | |
| JP2009016122A (en) | Laminated secondary battery and battery pack | |
| JPH09320637A (en) | Nonaqueous electrolyte secondary battery | |
| JP4655554B2 (en) | Power storage module and manufacturing method thereof | |
| CN215070051U (en) | Soft-package square battery electrode structure, battery and electronic equipment | |
| KR101154883B1 (en) | Method for Production of Electrode Assembly with Improved Electrolyte Wetting Property | |
| KR101590991B1 (en) | Electrode Assembly Having Separators Attached to Each Other and Battery Cell Comprising the Same | |
| CN217009472U (en) | Battery core and device for preparing battery core | |
| JP5561798B2 (en) | Multilayer secondary battery and battery pack | |
| JP6224124B2 (en) | Stepped electrode group stack | |
| JPH09147830A (en) | Battery and its electrode structure | |
| CN113258029A (en) | Soft package square battery electrode structure, battery, electronic equipment and preparation process | |
| WO2021022482A1 (en) | Method for manufacturing folding electric core of electrode composite unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |