CN114784352A - Battery preparation method and battery rolling and stacking system - Google Patents
Battery preparation method and battery rolling and stacking system Download PDFInfo
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- CN114784352A CN114784352A CN202210343980.XA CN202210343980A CN114784352A CN 114784352 A CN114784352 A CN 114784352A CN 202210343980 A CN202210343980 A CN 202210343980A CN 114784352 A CN114784352 A CN 114784352A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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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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Abstract
The application discloses a battery preparation method, which comprises the following steps: synchronously conveying a first diaphragm and a second diaphragm along a parallel direction, continuously placing a first pole piece between the first diaphragm and the second diaphragm, and alternately placing second pole pieces on the outer side of the first diaphragm and the outer side of the second diaphragm; the first pole piece, the first diaphragm, the second diaphragm and the second pole piece are compounded in a hot pressing mode; and winding the compounded first pole piece, the first diaphragm, the second diaphragm and the second pole piece to form the battery core. By adopting the preparation method, the advantage of high efficiency of the winding method and the excellent performance of the laminated battery are considered, and the manufacturing of the battery cell with any capacity and size can be met.
Description
Technical Field
The application relates to the technical field of battery production and manufacturing, in particular to a battery preparation method and a battery rolling and stacking system.
Background
Rectangular batteries are widely used in some mobile devices as a common battery shape at present. The battery core of the square battery is mainly formed by two methods: coiled and laminated. Although the winding method has the advantage of high efficiency, the formed battery has non-uniform internal structure due to deformation and stress at the bent part, and the cycle performance of the battery is affected. Although the lamination layer number and the pole piece size are not influenced in the lamination mode, the production efficiency is low, and phenomena such as pole piece dislocation and diaphragm folding are easy to occur in the lamination process.
Disclosure of Invention
Based on the above problems in the background art, the present application aims to provide a battery preparation method and a battery rolling and stacking system, which can take into account the advantages of high efficiency of a winding method and excellent performance of a laminated battery, and can meet the requirements of manufacturing battery cells of any capacity and size.
In a first aspect, the present application provides a method for preparing a battery, comprising:
synchronously conveying a first diaphragm and a second diaphragm along a parallel direction, continuously placing a first pole piece between the first diaphragm and the second diaphragm, and alternately placing second pole pieces on the outer side of the first diaphragm and the outer side of the second diaphragm;
the first pole piece, the first diaphragm, the second diaphragm and the second pole piece are compounded in a hot pressing mode;
and winding the compounded first pole piece, the first diaphragm, the second diaphragm and the second pole piece to form the battery cell.
Optionally, the method further comprises:
pressing a second pole piece outside the first diaphragm on the first diaphragm through a first protective film;
and pressing a second pole piece on the outer side of the second diaphragm on the second diaphragm through a second protective film.
Optionally, the method further comprises:
and monitoring the distance between the adjacent first pole pieces and the distance between the adjacent second pole pieces.
Optionally, the placing a first pole piece in series between the first diaphragm and the second diaphragm comprises:
die cutting is carried out on the first pole piece winding tape to form a first pole piece;
a first pole piece is placed between the first diaphragm and the second diaphragm.
Optionally, the staggered placement of the second pole pieces on both sides of the first diaphragm and the second diaphragm comprises:
die cutting is carried out on the second pole piece winding belt to form a second pole piece;
the second pole piece is placed outside the first diaphragm or outside the second diaphragm.
In a second aspect, the present application provides a battery rolling and stacking system, comprising:
the first diaphragm conveying device and the second diaphragm conveying device are used for conveying a first diaphragm and a second diaphragm which are parallel to each other;
the first pole piece feeding device is used for placing a first pole piece between the first diaphragm and the second diaphragm;
the two groups of second pole piece feeding devices are respectively used for placing second pole pieces on the outer sides of the first diaphragm and the second diaphragm;
the two groups of thermal compounding devices are used for carrying out thermal compounding on the first pole piece, the first diaphragm, the second diaphragm and the second pole piece;
and the winding mechanism is used for winding the compounded first pole piece, first diaphragm, second diaphragm and second pole piece to form the battery cell.
Optionally, the method further comprises:
a first protection film transfer device for generating a continuously moving first protection film which presses a second pole piece outside the first diaphragm against the first diaphragm;
and the second protective film conveying device is used for generating a continuously moving second protective film, and the second protective film presses a second pole piece on the outer side of the second diaphragm on the second diaphragm.
Optionally, the device further comprises a monitoring device for monitoring a distance between adjacent first pole pieces and a distance between adjacent second pole pieces.
Optionally, the first pole piece feeding device includes a first die-cutting mechanism and a first mechanical arm, the first die-cutting mechanism is configured to cut the first pole piece tape into the first pole piece, and the first mechanical arm is configured to place the first pole piece between the first diaphragm and the second diaphragm.
Optionally, the second pole piece feeding device includes a second die-cutting mechanism and a second mechanical arm, the second die-cutting mechanism is configured to cut the second pole piece tape into the second pole piece, and the second mechanical arm is configured to place the second pole piece outside the first diaphragm or outside the second diaphragm.
In a third aspect, the present application provides a battery fabricated using the method of any one of the first aspect.
As above, when the preparation method of the present application is used for winding the battery core, the distance between the adjacent first pole piece and the adjacent second pole piece can be gradually increased along the winding direction, so that the preparation method is applicable to the manufacturing of any capacity battery core, and when a large capacity battery core is manufactured, the distance between the adjacent pole pieces can be adjusted. In addition, the first pole piece, the second pole piece, the first diaphragm and the second diaphragm are coiled after being compounded through hot pressing, and compared with a traditional laminated method, the probability of pole piece dislocation and diaphragm wrinkling is greatly reduced. Therefore, the preparation method in the application simultaneously considers the advantages of high efficiency of the winding method and excellent performance of the laminated battery, and can meet the requirement of manufacturing battery cells with any capacity and size.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings required for the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
FIG. 1 is a flow chart of a method of making a battery according to an embodiment of the present application;
fig. 2 is a schematic diagram of a battery rolling and stacking system according to an embodiment of the present application;
fig. 3 is a partially enlarged view of a portion a in fig. 2;
fig. 4 is a schematic diagram of the battery cell unit in fig. 3 after winding and forming;
fig. 5 is a schematic view of a first and second pole piece web with the tabs on the same side of the cell;
fig. 6 is a schematic diagram of the cell configuration with the tabs on the same side of the cell;
fig. 7 is a schematic illustration of a first and second pole piece web with a tab on different sides of the cell;
fig. 8 is a schematic diagram of a battery configuration with tabs on different sides of the battery;
in the drawings, reference numerals refer to the following:
1. a first septum delivery device; 11. a first diaphragm;
2. a second membrane delivery device; 21. a second diaphragm;
3. a first pole piece feeding device; 31. a first pole piece;
4. a second pole piece feeding device; 41. a second pole piece;
5. a thermal compounding device; 51. an oven; 52. pressing rollers;
6. a winding mechanism;
7. a first protection film transfer device; 71. a first drive roll; 72. a first driven roller; 73. a first protective film;
8. a second protective film transfer device; 81. a second drive roll; 82. a second driven roller; 83. and a second protective film.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the embodiments of the present application and the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding of the technical solutions of the present application and the inventive concepts embodied in the present application, the conventional winding method and the lamination method are briefly described. The winding method is formed by winding after the continuous uninterrupted diaphragm, the positive plate, the diaphragm and the negative plate are sequentially overlapped, although the winding method has the advantage of high efficiency, the number of winding layers and the capacity of a single winding core are limited, for a large-capacity square shell, a plurality of winding cores are often required to be combined, and in addition, the bending part of the pole piece has larger stress after the winding forming due to the fact that the positive plate and the negative plate are continuously wound, so that the cycle performance of the battery is influenced.
The lamination type method is manufactured by alternately laminating the positive and negative pole pieces and the diaphragm which are independent after die cutting, overcomes the problem of stress concentration at the bending part of the winding type battery, and can meet the manufacturing of a large-capacity battery core, but has low production efficiency, difficult control of battery tension, influence of artificial or external environmental factors in the lamination process, and easy occurrence of phenomena of pole piece dislocation, diaphragm folding and the like. Therefore, the two methods for manufacturing the battery have great disadvantages.
Referring to fig. 1 and 2, a method for manufacturing a battery disclosed in an embodiment of the present application includes the following steps:
s101: providing a first membrane tape and a second membrane tape, respectively installing the first membrane tape and the second membrane tape on a specific conveying device, and synchronously conveying the first membrane and the second membrane along the parallel direction;
a first pole piece is placed continuously between the first diaphragm and the second diaphragm while a second pole piece is placed alternately on the outside of the first diaphragm and the outside of the second diaphragm.
It should be understood that the first and second pole pieces are independent pole pieces formed by cutting with a die cutting device. The first pole piece and the second pole piece have opposite polarities, namely when the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, and when the first pole piece is a negative pole piece, the second pole piece is a positive pole piece.
It should also be mentioned that in the present application the outer side of the first membrane refers to the side of the first membrane facing away from the second membrane and the outer side of the second membrane refers to the side of the second membrane facing away from the first membrane. The first pole piece and the second pole piece are placed on the first diaphragm and the second diaphragm and then move together with the first diaphragm and the second diaphragm. The staggered arrangement of the second pole pieces in the application means that the arrangement actions of the second pole pieces on two sides of the first diaphragm and the second diaphragm are alternately carried out, so that when the second pole pieces move along with the first diaphragm and the second diaphragm together, the second pole pieces are arranged on different sides of the adjacent first pole pieces.
S102: and compounding the first pole piece, the first diaphragm, the second diaphragm and the second pole piece in a hot pressing mode. The first pole piece and the second pole piece move together with the first diaphragm and the second diaphragm and are integrated under the action of high temperature and rolling after passing through the thermal compounding device.
S103: and winding the first pole piece, the first diaphragm, the second diaphragm and the second pole piece which are subjected to hot-pressing compounding through a winding needle to form the battery cell.
Referring to fig. 3 and 4, when the above-mentioned process is adopted for winding the battery cell, the distance between the adjacent first pole piece and the adjacent second pole piece can be gradually increased along the winding direction, so that the method is applicable to the manufacture of any capacity battery cell, and when a large-capacity battery cell is manufactured, the distance between the adjacent pole pieces can be adjusted. In addition, the first pole piece, the second pole piece, the first diaphragm and the second diaphragm are coiled after being compounded through hot pressing, and compared with a traditional laminated method, the probability of pole piece dislocation and diaphragm wrinkling is greatly reduced. Therefore, the preparation method in the application simultaneously considers the advantages of high efficiency of the winding method and excellent performance of the laminated battery, and can meet the requirements of manufacturing battery cores with any capacity and size.
Optionally, in step S101, the process of continuously placing the first pole piece between the first diaphragm and the second diaphragm specifically includes: the die cutting mechanism is adopted to die cut the first pole piece winding tape to form an independent first pole piece, then the mechanical arm is used for grabbing or adsorbing the first pole piece, and the first pole piece is placed between the first diaphragm and the second diaphragm.
Optionally, in step S101, the process of alternately placing the second pole pieces on the two sides of the first diaphragm and the second diaphragm specifically includes: and die cutting is carried out on the second pole piece winding belt by adopting a die cutting mechanism to form an independent second pole piece, then the second pole piece is grabbed or adsorbed by a mechanical arm, and the second pole piece is placed on the outer side of the first diaphragm or the outer side of the second diaphragm.
It should be noted that, when the tabs in the produced battery cell are on the same side, the tabs of the first pole piece and the tabs of the second pole piece are not in the same longitudinal plane, referring to fig. 5 and 6, the upper portion in the drawing is the second pole piece winding tape, and the lower portion is the first pole piece winding tape. The dotted line in the figure shows the die cutting line when the pole piece is die-cut, when the pole piece is die-cut to form a first pole piece winding tape, the position of the pole piece on the first pole piece winding tape after die cutting is satisfied, the pole pieces on any two adjacent first pole pieces are symmetrically arranged relative to the die cutting line between the two first pole pieces, namely when the pole piece of the last pole piece is on the left side, the pole piece on the next pole piece is on the right side. Similarly, when the second pole piece winding tape is formed by die cutting the pole pieces, the positions of the pole pieces on the second pole piece winding tape after die cutting are met, and the distance between any two adjacent second pole pieces is equal, namely the positions of the pole pieces on the adjacent pole pieces are the same. So set up to after making electric core coiling shaping, the utmost point ear on the first pole piece is located same row, and the utmost point ear on the second pole piece is located same row, and the convenience is as an organic whole with the utmost point ear welding of same polarity.
When the tabs in the produced cell are on different sides, referring to fig. 7 and 8, the upper part in the figure is the second pole piece winding tape, and the lower part is the first pole piece winding tape. At the moment, the lugs on the first pole piece and the second pole piece are arranged in the middle of the pole pieces for more convenient die cutting.
As an optional technical solution in the embodiment of the present application, the method further includes:
step S1011: after the first pole piece and the second pole piece are placed, the distance between the adjacent first pole pieces and the distance between the adjacent second pole pieces are monitored. Specifically, equipment such as a CCD camera can be adopted, whether the distance between the adjacent first pole pieces and the distance between the adjacent second pole pieces meet the precision requirement or not is monitored, when a large deviation occurs, the distance between the pole pieces can be adjusted in a shutdown or other mode, the phenomenon of pole piece dislocation of the winding-formed battery cell is prevented, and the precision of battery cell manufacturing is guaranteed.
As an optional technical solution in the embodiment of the present application, the method further includes:
step S1021: the first protective film is disposed on the outer side of the first diaphragm, the second protective film is disposed on the outer side of the second diaphragm, and the first protective film and the second protective film are continuously conveyed as belt-shaped films at a conveying speed equal to that of the first diaphragm and the second diaphragm. The second pole piece on the outer side of the first diaphragm is pressed on the first diaphragm through the first protective film, and the second pole piece on the outer side of the first diaphragm is conveyed to move together with the first diaphragm and the first protective film; the second pole piece on the outer side of the second diaphragm is pressed on the second diaphragm through the second protective film, and the second pole piece on the outer side of the second diaphragm is conveyed to move together with the second diaphragm and the second protective film.
In addition, PET membrane can be chooseed for use to first protection film and second protection film, and the setting of thermal recombination device is in the both sides of first protection film and second protection film, and first protection film and second protection film can play the guard action to second pole piece and first pole piece among them at the thermal recombination in-process.
Referring to fig. 2, the embodiment of the present application further discloses a battery rolling and stacking system, which includes a first separator conveying device 1, a second separator conveying device 2, a first pole piece feeding device 3, a second pole piece feeding device 4, a thermal compound device 5, and a winding mechanism 6.
The first and second membrane transfer devices 1 and 2 are conventional membrane transfer devices, and they are vertically spaced apart from each other and transfer the first and second membranes 11 and 21 parallel to each other.
The first pole piece feeding device 3 is located between the first diaphragm conveying device 1 and the second diaphragm conveying device 2, cuts the first pole piece winding tape to form independent first pole pieces 31, places the independent first pole pieces between the first diaphragm 11 and the second diaphragm 21, and controls the distance between the adjacent first pole pieces 31 by adjusting the feeding rate of the first pole piece feeding device 3.
The second pole piece feeding devices 4 are provided with two groups, are respectively positioned on the outer sides of the first diaphragm 11 and the second diaphragm 21, cut the second pole piece coiled strip to form independent second pole pieces 41, and are placed on the outer side of the first diaphragm 11 and the outer side of the second diaphragm 21, and the feeding speed and the action cycle of each group of second pole piece feeding devices 4 are respectively adjusted to control the distance between every two adjacent second pole pieces 41 on each side, so that the second pole pieces 41 on the two sides are alternately distributed.
The thermal recombination device 5 is provided with two sets, respectively located on the outer side of the first pole piece 31 and the outer side of the second pole piece 41. The thermal compound device 5 is an existing mechanism, and generally includes an oven 51 for generating heat and a press roller 52 for providing pressure, in the conveying direction along the first diaphragm 11 and the second diaphragm 21, the press roller 52 is located behind the oven 51, after the oven 51 heats the first diaphragm 11 and the second diaphragm 21, the first pole piece 31, the first diaphragm 11, the second pole piece 41 and the second diaphragm 21 are thermally pressed and compounded into a whole through the press roller 52, so as to facilitate winding.
The winding mechanism 6 is arranged at one end opposite to the first pole piece feeding device 3, the winding mechanism 6 is of an existing structure and comprises a power part and a winding needle connected to the output end of the power part, the winding needle is connected with the first diaphragm 11 and the second diaphragm 21, the power part controls the winding needle to rotate, and the first pole piece 31, the first diaphragm 11, the second pole piece 41 and the second diaphragm 21 which are subjected to hot-pressing compounding are wound to form the battery core.
Referring to fig. 2, as an alternative solution of the embodiment of the present application, a first protective film transfer device 7 and a second protective film transfer device 8 are further included. The first protective film transfer device 7 is located outside the first diaphragm 11, and the second protective film transfer device 8 is located outside the second diaphragm 21.
The first protective film transfer device 7 includes a first driving roller 71, a first driven roller 72, and a first protective film 73 wound between the first driving roller 71 and the first driven roller 72, the first protective film 73 moves to the first driving roller 71 side when the first driving roller 71 rotates, and the moving speed of the first protective film 73 is equal to the moving speed of the first diaphragm 11.
The second protective film transfer device 8 includes a second driving roller 81, a second driven roller 82, and a second protective film 83 wound between the second driving roller 81 and the second driven roller 82, when the second driving roller 81 rotates, the second protective film 83 moves to the second driving roller 81 side, and the moving speed of the second protective film 83 is equal to the moving speed of the second diaphragm 21.
The first protection film 73 and the second protection film 83 not only transmit the motion of the second pole piece 41, ensure that the second pole piece 41 does not slide relative to the first diaphragm 11 and the second diaphragm 21 during the motion process, but also protect the first pole piece 31 and the second pole piece 41 during the hot-press compounding process. It should be noted that the first protective film 73 and the second protective film 83 only assist the thermal press-bonding process, and are reusable as auxiliary materials.
As an optional technical solution in the embodiment of the present application, the apparatus further includes a monitoring device, and the monitoring device may be, but is not limited to, adopt a CCD camera or other devices to monitor a distance between adjacent first pole pieces 31 and a distance between adjacent second pole pieces 41.
Optionally, the first pole piece feeding device 3 includes a first die-cutting mechanism and a first mechanical arm, and after the first die-cutting mechanism cuts the first pole piece tape into the independent first pole piece, the first mechanical arm grabs or adsorbs the first pole piece, and then places the first pole piece between the first diaphragm and the second diaphragm.
Optionally, the second pole piece feeding device 4 includes a second die-cutting mechanism and a second mechanical arm, and after the second die-cutting mechanism cuts the second pole piece tape into the independent second pole piece, the second mechanical arm grabs or adsorbs the second pole piece, and then places the second pole piece outside the first diaphragm or outside the second diaphragm.
The first die-cutting mechanism, the first mechanical arm, the second die-cutting mechanism and the second mechanical arm are all the prior art in the field, and the detailed structure of the first die-cutting mechanism, the first mechanical arm, the second die-cutting mechanism and the second mechanical arm is not described in detail in the application.
The embodiment of the application also discloses a battery which is prepared by adopting the preparation method of the battery.
The embodiments of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples. However, the above description of the embodiments is only for assisting understanding of the technical solutions of the present application and the core ideas thereof. Therefore, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the changes or modifications of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (10)
1. A method of making a battery, comprising:
synchronously conveying a first diaphragm and a second diaphragm along a parallel direction, continuously placing a first pole piece between the first diaphragm and the second diaphragm, and alternately placing a second pole piece on the outer side of the first diaphragm and the outer side of the second diaphragm;
the first pole piece, the first diaphragm, the second diaphragm and the second pole piece are compounded in a hot pressing mode;
and winding the compounded first pole piece, the first diaphragm, the second diaphragm and the second pole piece to form the battery cell.
2. The method of manufacturing a battery of claim 1, further comprising:
pressing a second pole piece outside the first diaphragm on the first diaphragm through a first protective film;
and pressing a second pole piece on the outer side of the second diaphragm on the second diaphragm through a second protective film.
3. The method of manufacturing a battery of claim 1, further comprising:
and monitoring the distance between the adjacent first pole pieces and the distance between the adjacent second pole pieces.
4. The method of preparing a battery of claim 1, wherein said placing a first pole piece in series between said first separator and a second separator comprises:
die cutting is carried out on the first pole piece winding tape to form a first pole piece;
a first pole piece is placed between the first membrane and the second membrane.
5. The method of manufacturing a battery according to claim 1, wherein the interleaving of the second pole pieces on both sides of the first and second separators comprises:
die cutting is carried out on the second pole piece winding belt to form a second pole piece;
a second pole piece is placed either outside the first membrane or outside the second membrane.
6. A battery rolling and stacking system, comprising:
the first diaphragm conveying device and the second diaphragm conveying device are used for conveying the first diaphragm and the second diaphragm which are parallel to each other;
the first pole piece feeding device is used for placing a first pole piece between the first diaphragm and the second diaphragm;
the two groups of second pole piece feeding devices are respectively used for placing second pole pieces on the outer sides of the first diaphragm and the second diaphragm;
the two groups of thermal compounding devices are used for carrying out thermal compounding on the first pole piece, the first diaphragm, the second diaphragm and the second pole piece;
and the winding mechanism is used for winding the compounded first pole piece, first diaphragm, second diaphragm and second pole piece to form the battery cell.
7. The battery stacking system of claim 6, further comprising:
a first protection film transfer device for generating a continuously moving first protection film which presses a second pole piece outside the first diaphragm against the first diaphragm;
and the second protective film conveying device is used for generating a continuously moving second protective film, and the second protective film presses a second pole piece outside the second diaphragm on the second diaphragm.
8. The battery stacking system of claim 6, further comprising a monitoring device for monitoring a spacing between adjacent first pole pieces and a spacing between adjacent second pole pieces.
9. The battery rolling system of claim 6, wherein the first pole piece feeding device comprises a first die-cutting mechanism for shearing the first pole piece web into the first pole piece and a first robotic arm for placing the first pole piece between the first membrane and the second membrane;
optionally, the second pole piece feeding device includes a second die-cutting mechanism and a second mechanical arm, the second die-cutting mechanism is configured to cut the second pole piece tape into the second pole piece, and the second mechanical arm is configured to place the second pole piece outside the first diaphragm or outside the second diaphragm.
10. A battery produced by the production method according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210343980.XA CN114784352A (en) | 2022-03-31 | 2022-03-31 | Battery preparation method and battery rolling and stacking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210343980.XA CN114784352A (en) | 2022-03-31 | 2022-03-31 | Battery preparation method and battery rolling and stacking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114784352A true CN114784352A (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210343980.XA Pending CN114784352A (en) | 2022-03-31 | 2022-03-31 | Battery preparation method and battery rolling and stacking system |
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| Country | Link |
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| CN (1) | CN114784352A (en) |
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- 2022-03-31 CN CN202210343980.XA patent/CN114784352A/en active Pending
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