CN118017025A - Method for manufacturing integral lamination type battery cell and manufactured battery cell - Google Patents
Method for manufacturing integral lamination type battery cell and manufactured battery cell Download PDFInfo
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- CN118017025A CN118017025A CN202410170784.6A CN202410170784A CN118017025A CN 118017025 A CN118017025 A CN 118017025A CN 202410170784 A CN202410170784 A CN 202410170784A CN 118017025 A CN118017025 A CN 118017025A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000003475 lamination Methods 0.000 title claims abstract description 36
- 238000005520 cutting process Methods 0.000 claims abstract description 107
- 239000011248 coating agent Substances 0.000 claims description 58
- 238000000576 coating method Methods 0.000 claims description 58
- 239000000758 substrate Substances 0.000 claims description 30
- 238000010030 laminating Methods 0.000 claims description 5
- 238000003698 laser cutting Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 13
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention belongs to the field of battery manufacturing. The invention provides a manufacturing method of an integral lamination type battery cell and the manufactured battery cell, wherein the manufacturing method comprises the steps of using a specific negative electrode cutting body and a corresponding positive electrode cutting body, wherein a plurality of undetached pole pieces and corresponding pole lugs are reserved in the cutting body, and connecting parts are arranged between the pole pieces to keep stable, so that the alignment degree and stability of lamination can be increased; and after the negative electrode cutting body, the corresponding positive electrode cutting body and the diaphragm are integrally laminated, a plurality of small cell packages can be further cut. According to the manufacturing method, tens or even hundreds of electric cores can be manufactured by lamination, the process efficiency of the negative battery is greatly improved, the alignment degree of the positive electrode and the negative electrode of the electric core is ensured, and meanwhile, the obtained electric core has excellent consistency and quality stability.
Description
Technical Field
The invention belongs to the technical field of battery manufacturing, and relates to a manufacturing method of an integral lamination type battery cell and the manufactured battery cell.
Background
At present, the manufacturing method of the lithium battery mainly comprises two types of winding type and lamination type.
The winding process is to make the positive plate and the negative plate into continuous long plates, separate the plates by a diaphragm, and then wind the plates to form the battery winding core. Conventional wound lithium ion batteries formed by the winding process typically suffer from stress concentrations where the pole pieces bend, and long-term accumulation of expansion and contraction of the pole pieces due to charge and discharge may cause further deformation or damage to the pole pieces, thereby affecting battery performance.
Lamination type processes are mainly classified into a zigzag lap winding process and a winding lamination process.
The Z-shaped lap winding process is to cut the positive and negative plates into single plates respectively, the diaphragms are in Z-shaped lap winding, the positive and negative plates are overlapped in sequence in a crossed mode, and the middle is separated by the diaphragms. The Z-shaped lap winding production of the positive electrode single sheet, the diaphragm and the negative electrode single sheet is sequentially lap-wound, the production efficiency is low, the diaphragm is continuously stressed, and the pole pieces which are piled up are easily pulled in the lamination process, so that dislocation is formed, and the performance of the battery is affected.
The winding lamination process is to stack the positive plate, the diaphragm and the negative plate in turn to form the battery unit, and then locate and combine the battery units on the second diaphragm layer, and wind the second diaphragm layer into the battery winding core. The battery cell formed by winding the wound laminated battery along one direction is elliptical in cross section. The process has low alignment precision of the positive and negative plates due to the problem of accumulation precision.
Meanwhile, the process can not conveniently prepare special-shaped batteries such as arc-shaped batteries, round cakes, trapezoids, triangles and the like. For example, the winding process can only produce square and cylindrical battery products, and thus cannot meet the application requirements of different fields.
Compared with the method, the full-sheet lamination process can conveniently prepare batteries with other structures such as arc, round cake, trapezoid, triangle and the like, but the process needs to cut the positive plate, the negative plate and the diaphragm into a large number of single sheets and assemble the single sheets one by one. Therefore, the process is complicated and time-consuming, and at the same time, the single diaphragm is more easily affected by static electricity and air flow due to the extremely light weight, so that the lamination efficiency is reduced, and the alignment problem is easily caused. Compared with the manufacture of large batteries, such as vehicle-mounted power batteries, when the existing full-sheet lamination process is used for manufacturing the consumer electronic batteries with smaller model sizes, the problems of low efficiency and poor alignment caused by a large number of lamination sheets with small size single sheets are particularly remarkable due to the fact that the overall size of the battery core is greatly reduced, and accordingly consistency and stability among all lamination batteries are poor.
Therefore, there is a need to develop a new technology for lithium battery lamination with high efficiency and high accuracy.
Disclosure of Invention
In view of the problems existing in the prior art, an object of the present invention is to provide a method for manufacturing an integral lamination type battery cell and a manufactured battery cell, wherein the manufacturing method includes using a specific negative electrode cutting body and a corresponding positive electrode cutting body, wherein a plurality of non-separated pole pieces and corresponding pole lugs are reserved in the cutting body, and connecting parts are arranged between the pole pieces to keep stable, so that alignment degree and stability during lamination can be increased; and after the negative electrode cutting body, the corresponding positive electrode cutting body and the diaphragm are integrally laminated, a plurality of small cell packages can be further cut. According to the manufacturing method, tens or even hundreds of electric cores can be manufactured by lamination, the process efficiency of the negative battery is greatly improved, the alignment degree of the positive electrode and the negative electrode of the electric core is ensured, and meanwhile, the obtained electric core has excellent consistency and quality stability.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for manufacturing an integral lamination type battery cell, the method comprising:
preparing an electrode substrate, wherein the electrode substrate comprises a current collector, the current collector is provided with a coating area and a non-coating area, and the coating area is provided with an active layer; performing first cutting on the electrode matrix to form and retain at least two pole pieces formed in the coating area, connecting parts formed between every two adjacent pole pieces, and pole lugs formed in the non-coating area and corresponding to each pole piece, so as to obtain an electrode cutting body;
The negative electrode cutting body and the corresponding positive electrode cutting body are obtained according to the method,
And laminating the negative electrode cutting body, the diaphragm and the positive electrode cutting body to form a laminated body, and performing second cutting to obtain at least two independent battery cores separated from the laminated body.
According to the invention, the specific negative electrode cutting body and the corresponding positive electrode cutting body are manufactured and used, so that a plurality of undetached pole pieces and corresponding pole lugs are reserved in the cutting body, and the connecting parts are arranged between the pole pieces to keep stable, so that the pole pieces cannot generate displacement in the subsequent process due to shaking or deformation, and the alignment degree and stability of lamination can be increased; and then forming small cell units with cell structures by integrally laminating the negative electrode cutting body, the corresponding positive electrode cutting body and the diaphragm, thereby further cutting out the small cell units to form a plurality of independent small cell bags. According to the manufacturing method, tens or even hundreds of electric cores can be manufactured by lamination, the process efficiency of the negative battery is greatly improved, the alignment degree of the positive electrode and the negative electrode of the electric core is ensured, and meanwhile, the obtained electric core has excellent consistency and quality stability. The manufacturing method is very suitable for manufacturing special-shaped batteries with different shapes due to high efficiency and high precision of the manufacturing method, and can realize simultaneous production of a plurality of laminated batteries.
In the manufacturing method of the present invention, the method of manufacturing the negative electrode cut body includes: preparing a negative electrode substrate, wherein the negative electrode substrate comprises a negative electrode current collector, such as copper foil, and the negative electrode current collector is provided with a negative electrode coating area and a negative electrode non-coating area, and the negative electrode coating area is provided with a negative electrode active layer; first cutting is carried out on the negative electrode substrate, so that the negative electrode substrate is formed and reserved with at least two negative electrode pieces formed in the negative electrode coating area, a negative electrode piece connecting part formed between every two adjacent negative electrode pieces, and a negative electrode tab formed by each negative electrode piece in the negative electrode non-coating area correspondingly; and obtaining the negative electrode cutting body.
In the manufacturing method of the present invention, the method for manufacturing the positive electrode cutting body includes: preparing a positive electrode substrate, wherein the positive electrode substrate comprises a positive electrode current collector, such as aluminum foil, and the positive electrode current collector is provided with a positive electrode coating area and a positive electrode non-coating area, and the positive electrode coating area is provided with a positive electrode active layer; first cutting is carried out on the positive electrode substrate, so that the positive electrode substrate is formed and reserved with at least two positive electrode plates formed in the positive electrode coating area, positive electrode plate connecting parts formed between every two adjacent positive electrode plates, and positive electrode lugs formed by each positive electrode plate in the positive electrode non-coating area correspondingly; and obtaining a negative electrode cutting body.
It can be understood that the positive electrode tab and the negative electrode tab should be kept non-overlapping and arranged in a staggered manner after the negative electrode cutting body and the positive electrode cutting body are integrally laminated.
The following technical scheme is a preferred technical scheme of the invention, but is not a limitation of the technical scheme provided by the invention, and the technical purpose and beneficial effects of the invention can be better achieved and realized through the following technical scheme.
As a preferred embodiment of the present invention, the first cutting method includes at least one of laser cutting, cutting die cutting or die cutting, for example, but not limited to, a combination of laser cutting and cutting die cutting, a combination of laser cutting and die cutting or a combination of die cutting and cutting die cutting, and the like.
As a preferred technical solution of the present invention, the shape of the pole piece includes at least one of an arc shape, a circle shape, an ellipse shape, a quincuncial shape or a polygonal shape (including triangle, square, etc.), and typical, but non-limiting, combination examples include a combination of an arc shape and a circle shape, a combination of an arc shape and an ellipse shape, a combination of a quincuncial shape and a circle shape, and a combination of a polygon shape and a circle shape.
It is understood that the combination of the pole piece shapes means that the pole pieces can have different shapes in the same electrode cutting body, or that at least two pole pieces with different shapes exist in the same electrode cutting body. However, the shapes of the negative electrode cutting body and the electrode plate at the corresponding position in the corresponding positive electrode cutting body are the same or similar, so that the negative electrode plate can form complete package on the positive electrode plate, and the fit degree and the alignment degree are increased.
As a preferred technical scheme of the invention, at least two positioning holes are also formed in the non-coating area of the electrode cutting body.
Preferably, the lamination is performed using a locating pin to cooperate with the locating hole.
As a preferable technical scheme of the invention, the positioning holes are arranged at the peripheral edges of the electrode cutting body.
Preferably, the positioning holes of the positive electrode cutting body are in one-to-one correspondence with the positioning holes of the negative electrode cutting body.
According to the invention, through the design of the positioning holes and the cooperation of the positioning pins, the alignment deviation of the positive pole and the negative pole of the laminated battery is improved from < +/-1 mm of the conventional laminated battery to less than 0.2mm, and the consistency and the capacity limit of the battery are further improved.
As a preferable technical scheme of the invention, the diaphragm is a whole diaphragm which can cover all pole pieces in the electrode cutting body.
Unlike the whole sheet lamination process in the prior art, the manufacturing method of the invention can clamp the diaphragm during lamination by using the negative electrode cutting body and the positive electrode cutting body, so that the whole diaphragm can be paved on the cutting body, the process of complex lamination by using a diaphragm single sheet is omitted, and the process of firstly cutting out independent battery cells through the unified whole lamination by using the manufacturing method can improve the efficiency, is beneficial to improving the alignment degree of the positive electrode and the negative electrode of the lamination and the diaphragm, and improves the consistency between the battery cells.
Preferably, the laminated body has a layer structure comprising a negative electrode cutting body, a first diaphragm, a positive electrode cutting body and a second diaphragm which are sequentially overlapped from bottom to top.
As a preferred embodiment of the present invention, the size of the coating region of the positive electrode substrate is smaller than the size of the coating region of the negative electrode substrate.
Preferably, the width of the active layer of the positive electrode substrate is smaller than the width of the active layer of the negative electrode substrate by 1 to 3mm, for example, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm, etc., but not limited to the recited values, and other non-recited values within the above-recited ranges are equally applicable.
Preferably, the size of the pole piece of the positive electrode cutting body is smaller than the size of the pole piece of the negative electrode cutting body.
In the invention, the sizes of the anode coating area, the active layer and the pole piece are preferably slightly smaller than the sizes of the corresponding anode coating area, the active layer and the pole piece so as to ensure that the anode in the final battery cell can completely cover the anode.
In a preferred embodiment of the present invention, in the electrode substrate, the current collector is rectangular, and the coating region is disposed in the center of the current collector and is rectangular, and has the same length as the current collector, so that the non-coating region is formed on both sides of the current collector along the width.
Preferably, at least two rows of pole pieces are formed in the coating area, each row forms at least two parallel pole pieces, and the connecting parts are arranged between the pole pieces corresponding to two adjacent rows.
Preferably, the connecting part is a connecting strip with a smaller size than the pole piece.
As a preferable technical scheme of the invention, the non-coating area is provided with four positioning holes which are respectively close to four corners of the coating area;
Preferably, along the width direction of the diaphragm, the diaphragm is aligned with the edge of the positioning hole; the separator exceeds the length of the current collector along the length of the separator.
In the present invention, the diaphragm edge is preferably aligned with the positioning hole edge, and the diaphragm is preferably engaged between the positioning holes (particularly when the positioning pin is inserted), so that the positioning hole can be used to improve the positioning and alignment accuracy of the diaphragm.
In a second aspect, the invention provides a cell obtained according to the manufacturing method of the first aspect.
Compared with the prior art, the invention has at least the following beneficial effects:
According to the invention, the specific negative electrode cutting body and the corresponding positive electrode cutting body are manufactured and used, so that a plurality of undetached pole pieces and corresponding pole lugs are reserved in the cutting body, and the connecting parts are arranged between the pole pieces to keep stable, so that the pole pieces cannot generate displacement in the subsequent process due to shaking or deformation, and the alignment degree and stability of lamination can be increased; and then forming small cell units with cell structures by integrally laminating the negative electrode cutting body, the corresponding positive electrode cutting body and the diaphragm, thereby further cutting out the small cell units to form a plurality of independent small cell bags. According to the manufacturing method, tens or even hundreds of electric cores can be manufactured by lamination, the process efficiency of the negative battery is greatly improved, the alignment degree of the positive electrode and the negative electrode of the electric core is ensured, and meanwhile, the obtained electric core has excellent consistency and quality stability. The manufacturing method is very suitable for manufacturing special-shaped batteries with different shapes due to high efficiency and high precision of the manufacturing method, and can realize simultaneous production of a plurality of laminated batteries.
Drawings
Fig. 1 is a schematic view of a negative electrode current collector in example 1;
FIG. 2 is a schematic view of the negative electrode base in example 1;
FIG. 3 is a schematic view of a negative electrode cutting body in example 1;
fig. 4 is a schematic view of the positive electrode current collector in example 1;
FIG. 5 is a schematic view of the positive electrode substrate in example 1;
FIG. 6 is a schematic view of the positive electrode cutting body in example 1;
Fig. 7 is a schematic view of the negative electrode cutting body and the first separator in example 1 superimposed;
FIG. 8 is a schematic view of the stack of sheets of example 1;
fig. 9 is a schematic diagram showing a change in the partial structure at the time of performing the second cutting in embodiment 1;
Fig. 10 is a schematic view of a negative electrode cutting body and a positive electrode cutting body in example 2;
In the figure, a 10-negative electrode current collector, a 11-negative electrode coating region, a 12-negative electrode non-coating region, a 13-negative electrode plate, a 14-negative electrode tab, a 15-negative electrode plate connecting part, a 16-negative electrode positioning hole, a 20-positive electrode current collector, a 21-positive electrode coating region, a 22-positive electrode non-coating region, a 23-positive electrode plate, a 24-positive electrode tab, a 25-positive electrode plate connecting part, a 26-positive electrode positioning hole, a 30-first diaphragm and a 40-second diaphragm.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments.
It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a laminated manufacturing method of a battery cell, which comprises the following steps:
Preparing a negative electrode substrate, as shown in fig. 1-3, wherein the negative electrode substrate comprises a negative electrode current collector 10, which is a rectangular copper foil, the negative electrode current collector 10 has a rectangular negative electrode coating region 11 arranged in the center, the length of which is the same as the length of the negative electrode current collector 10, and negative electrode non-coating regions 12 formed on both sides of the negative electrode current collector 10 along the width; the negative electrode coating region 11 is provided with a negative electrode active layer;
Performing first cutting on the negative electrode substrate by using laser cutting, so that the negative electrode substrate is formed and reserved on the upper row and the lower row of negative electrode plates 13 of the negative electrode coating area 11, each row is provided with 13 negative electrode plates 13 which are provided with gaps and are mutually parallel, and the negative electrode plates 13 are rectangular; the negative electrode plate connecting parts 15 are arranged between two adjacent rows of corresponding negative electrode plates 13, and the negative electrode plate connecting parts 15 are connecting strips with the size smaller than that of the negative electrode plates 13; and a negative electrode tab 14 formed on each negative electrode tab 13 in the negative electrode non-coating region 12; and four negative electrode positioning holes 16 arranged in the negative electrode non-coating region 12, wherein the positions of the four negative electrode positioning holes are respectively close to four corners of the negative electrode coating region 11, so as to obtain a negative electrode cutting body;
Preparing a positive electrode substrate, as shown in fig. 4 to 6, wherein the positive electrode substrate comprises a positive electrode current collector 20, which is a rectangular aluminum foil, the positive electrode current collector 20 has a rectangular positive electrode coating region 21 arranged in the center, the length of the rectangular positive electrode coating region is the same as that of the positive electrode current collector 20, and positive electrode non-coating regions 22 are formed on two sides of the positive electrode current collector 20 along the width; the positive electrode coating region 21 is provided with a positive electrode active layer having a width smaller than the negative electrode active width by 2mm;
The positive electrode substrate is subjected to first cutting by using a cutting die, so that the positive electrode substrate is formed and reserved in the positive electrode coating area 21, an upper row of positive electrode plates 23 and a lower row of positive electrode plates 23 are formed and reserved, 13 positive electrode plates 23 which are provided with gaps and are mutually parallel are arranged in each row, the positive electrode plates 23 are rectangular and correspond to the negative electrode plates 13 at corresponding positions one by one, and the size of the positive electrode plates 23 is smaller than that of the corresponding negative electrode plates 13; the positive electrode plate connecting parts 25 are arranged between two adjacent rows of corresponding positive electrode plates 23, and the positive electrode plate connecting parts 25 are connecting strips with the size smaller than that of the positive electrode plates 23; and positive electrode tabs 24 formed on the positive electrode non-coating regions 22 in a corresponding manner for each positive electrode piece 23, wherein the positive electrode tabs 24 do not overlap with the corresponding negative electrode tabs 14; and four positive positioning holes 26 arranged in the positive non-coating region 22, wherein the positions of the four positive positioning holes are respectively close to four corners of the positive coating region 21, and the positive positioning holes 26 are in one-to-one correspondence with the negative positioning holes 16 to obtain a positive cutting body;
Preparing a first diaphragm 30 and a second diaphragm 40; as shown in fig. 7, the first separator 30 is a whole separator that can cover all the negative electrode tabs 13 in the negative electrode cutting body, and the first separator 30 is aligned with the edge of the negative electrode positioning hole 16 along the width direction of the first separator 30; along the length direction of the first separator 30, the first separator 30 exceeds the length of the negative electrode current collector 10; the second diaphragm 40 is a whole diaphragm capable of covering all positive electrode pieces 23 in the positive electrode cutting body, and the second diaphragm 40 is aligned with the edge of the positive electrode positioning hole 26 along the width direction of the second diaphragm 40; along the length direction of the second separator 40, the second separator 40 exceeds the length of the positive electrode current collector 20;
Laminating the negative electrode cutting body, the first diaphragm 30, the positive electrode cutting body and the second diaphragm 40 which are sequentially overlapped from bottom to top on a lamination workbench reserved with positioning pins, pressing the negative electrode positioning holes 16 and the positive electrode positioning holes 26 into the positioning pins to realize high-precision positioning, and realizing high-precision positioning of the upper and lower edges of the first diaphragm 30 and the second diaphragm 40 along the width direction through the positioning pins to form a lamination body as shown in fig. 8; and (3) carrying out second cutting on the laminated body, as shown in fig. 9, cutting out 13 prefabricated bodies which are connected with an upper cell structure and a lower cell structure through a connecting part, and cutting out the connecting part and other parts of non-electrode lugs in a non-coating area to obtain 26 independent cells separated from the laminated body.
Example 2
The present embodiment provides a method for manufacturing a laminated battery cell, in which the first cutting is performed on the negative electrode cutting body and the positive electrode cutting body according to fig. 10, except that the other conditions are exactly the same as in embodiment 1.
From the above, the invention uses the specific negative electrode cutting body and the corresponding positive electrode cutting body, a plurality of undetached pole pieces and corresponding pole lugs are reserved in the cutting body, and the connecting parts are arranged between the pole pieces to keep stable, so that the alignment degree and stability during lamination can be increased; and after the negative electrode cutting body, the corresponding positive electrode cutting body and the diaphragm are integrally laminated, a plurality of small cell packages can be further cut. According to the manufacturing method, tens or even hundreds of electric cores can be manufactured by lamination, the process efficiency of the negative battery is greatly improved, the alignment degree of the positive electrode and the negative electrode of the electric core is ensured, and meanwhile, the obtained electric core has excellent consistency and quality stability.
The detailed structural features of the present invention are described in the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The detailed process equipment and process flow of the present invention are described by the above embodiments, but the present invention is not limited to, i.e., it does not mean that the present invention must be practiced depending on the detailed process equipment and process flow. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. A method of manufacturing an integral laminate of a cell, the method comprising:
preparing an electrode substrate, wherein the electrode substrate comprises a current collector, the current collector is provided with a coating area and a non-coating area, and the coating area is provided with an active layer; performing first cutting on the electrode matrix to form and retain at least two pole pieces formed in the coating area, connecting parts formed between every two adjacent pole pieces, and pole lugs formed in the non-coating area and corresponding to each pole piece, so as to obtain an electrode cutting body;
The negative electrode cutting body and the corresponding positive electrode cutting body are obtained according to the method,
And laminating the negative electrode cutting body, the diaphragm and the positive electrode cutting body to form a laminated body, and performing second cutting to obtain at least two independent battery cores separated from the laminated body.
2. The method of manufacturing according to claim 1, wherein the first cutting method comprises at least one of laser cutting, die cutting, or die cutting.
3. The method of manufacturing according to claim 1 or 2, wherein the shape of the pole piece comprises at least one of an arc, a circle, an ellipse, a quincuncial shape, or a polygon.
4.A method of manufacturing according to any one of claims 1 to 3, wherein at least two positioning holes are also formed in the non-coating region of the electrode cutting body;
Preferably, the lamination is performed using a locating pin to cooperate with the locating hole.
5. The method according to any one of claim 4, wherein the positioning holes are provided at the peripheral edge of the electrode cutting body;
Preferably, the positioning holes of the positive electrode cutting body are in one-to-one correspondence with the positioning holes of the negative electrode cutting body.
6. The method of any one of claims 1 to 5, wherein the separator is a whole separator capable of covering all the pole pieces in the electrode cut body;
preferably, the laminated body has a layer structure comprising a negative electrode cutting body, a first diaphragm, a positive electrode cutting body and a second diaphragm which are sequentially overlapped from bottom to top.
7. The method of manufacturing according to any one of claims 1 to 6, wherein the size of the coating region of the positive electrode substrate is smaller than the size of the coating region of the negative electrode substrate;
preferably, the width of the active layer of the positive electrode substrate is smaller than the width of the active layer of the negative electrode substrate by 1-3 mm;
Preferably, the size of the pole piece of the positive electrode cutting body is smaller than the size of the pole piece of the negative electrode cutting body.
8. The method according to any one of claims 1 to 7, wherein in the electrode base, the current collector is rectangular, the coating region is provided in the center of the current collector and is rectangular, and the length is the same as the length of the current collector, so that the current collector forms the non-coating region along both sides of the width;
Preferably, at least two rows of pole pieces are formed in the coating area, each row of pole pieces is at least formed with two parallel pole pieces, and the connecting parts are arranged between the two adjacent rows of corresponding pole pieces;
Preferably, the connecting part is a connecting strip with a smaller size than the pole piece.
9. The manufacturing method according to claim 8, wherein the non-coating region is provided with four positioning holes near four corners of the coating region, respectively;
Preferably, along the width direction of the diaphragm, the diaphragm is aligned with the edge of the positioning hole; the separator exceeds the length of the current collector along the length of the separator.
10. A cell obtained according to the manufacturing method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410170784.6A CN118017025A (en) | 2024-02-06 | 2024-02-06 | Method for manufacturing integral lamination type battery cell and manufactured battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410170784.6A CN118017025A (en) | 2024-02-06 | 2024-02-06 | Method for manufacturing integral lamination type battery cell and manufactured battery cell |
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| CN118017025A true CN118017025A (en) | 2024-05-10 |
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| CN202410170784.6A Pending CN118017025A (en) | 2024-02-06 | 2024-02-06 | Method for manufacturing integral lamination type battery cell and manufactured battery cell |
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| CN (1) | CN118017025A (en) |
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- 2024-02-06 CN CN202410170784.6A patent/CN118017025A/en active Pending
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