Base material for manufacturing lithium battery pole piece

Abstract

The utility model relates to a base material for manufacturing lithium battery pole pieces. The base material comprises a plurality of initial pole pieces, the initial pole pieces are transversely and sequentially arranged; the initial pole piece comprises a tab pretreatment area and a coating area for coating an electrode material which are arranged adjacently; after the excess material area is cut off in the tab pretreatment area, a tab is formed; a pretreatment part is formed between every two adjacent initial pole pieces; the pretreatment part is arranged along the length direction of the initial pole piece; the pretreatment part comprises a plurality of gap regions and a plurality of thinning regions; the thinning regions can be quickly broken to separate two adjacent initial pole pieces when the two adjacent initial pole pieces are pulled by external force; and the thickness of the thinning area is smaller than that of the initial pole piece. According to the utility model, due to the existence of the thinning areas, the adjacent pole piece substrates can be easily pulled and broken along the thinning areas, and redundant pretreatment parts of the thinning areas are cut off by adopting a laser cutting process, so that a foundation is laid for subsequently producing a lithium battery by adopting a lamination process; and the production efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a substrate for manufacturing lithium battery pole pieces. Background Art

[0002] In the manufacturing process of lithium batteries, the cutting of pole pieces is a crucial link, which is directly related to the performance and production cost of the battery. Specifically, the pole piece cutting process of lithium batteries involves direct cutting on the foil coated with electrode materials. However, this direct physical cutting method often leads to some adverse consequences, such as burrs on the edge of the pole piece, which not only affects the flatness and quality of the pole piece, but also may pose a potential threat to the safety of the battery. At the same time, the coating material may fall off during the cutting process, which not only wastes materials, but also may affect the performance of the battery.

[0003] In order to solve these problems, the existing lithium battery pole piece production method generally adopts laser cutting technology. Laser cutting has become an ideal choice for pole piece cutting due to its high precision, high efficiency and low damage. Especially in the battery cells produced by the winding process, it usually only involves the cutting of one positive pole piece, one negative pole piece and two diaphragms. This cutting method is relatively simple, and no complicated cutting is required between the pole pieces.

[0004] However, when it comes to battery cells produced by the stacking process, the situation becomes complicated. The battery cells of the stacking process are composed of a large number of positive and negative electrode sheets, and the number of positive and negative electrode sheets is often as high as hundreds or more. In this process, each electrode sheet needs to be laser cut to ensure that they can be stacked together accurately. However, due to the speed of laser cutting, the production efficiency of the stacking process is often low. Specifically, although laser cutting equipment is precise and efficient, its cutting speed still cannot fully match the needs of large-scale production. Therefore, the cutting of the electrode sheet has become one of the bottleneck processes in the stacking production process, restricting the efficiency of the entire production process. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In order to solve the above problems in the prior art, the utility model provides a substrate for making a lithium battery pole piece.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] A substrate for making lithium battery pole pieces, comprising a plurality of initial pole pieces; the initial pole pieces are arranged in sequence laterally; the initial pole pieces comprise adjacently arranged pole ear pretreatment areas and a coating area for coating electrode materials; the pole ears are formed after the surplus material area is cut off from the pole ear pretreatment areas; a pretreatment portion is formed between adjacent initial pole pieces; the pretreatment portion is arranged along the length direction of the initial pole pieces; the pretreatment portion comprises a plurality of gap areas and a plurality of thinning areas for quickly breaking and separating two adjacent initial pole pieces when two adjacent initial pole pieces are pulled by external force; the thickness of the thinning area is lower than the thickness of the initial pole piece.

[0010] Furthermore, the coating area is located below the initial electrode piece; the electrode tab pretreatment area is located above the coating area; and the residual material area is located on both sides of the electrode tab.

[0011] Furthermore, the residual material area is symmetrically or asymmetrically arranged on both sides of the pole ear.

[0012] Furthermore, both upper and lower sides of the thinning area are thinned to form a thinning portion.

[0013] Furthermore, the thinning portions on the upper and lower sides of the thinning zone are symmetrically arranged; and the cross-sectional shape of the thinning portion is V-shaped, U-shaped, or inverted trapezoidal.

[0014] Furthermore, the gap area and the thinning area are arranged at intervals.

[0015] Furthermore, the thinning areas include three, which are respectively arranged at the upper and lower ends and the middle part of the pretreatment part; a gap area is formed between adjacent thinning areas; and the gap area is a hollow part.

[0016] Furthermore, the length of the thinning zone is 10-20 mm.

[0017] Furthermore, the width of the pretreatment portion is 1-3 mm.

[0018] (III) Beneficial effects

[0019] The beneficial effect of the utility model is that the time for coating the electrode material can be saved by performing a large-scale coating process on the coating area of ​​the original substrate. After coating, due to the existence of the thinning area, the adjacent pole piece substrates can be easily pulled and disconnected along the thinning area, and then the excess material area can be cut off in large quantities by a stamping process, leaving the pole ear part; after the initial pole piece is pulled and separated, the laser cutting process is used to cut off the excess pre-treatment part of the thinning area, and finally a single complete pole piece coated with electrode material is formed, which paves the way for the subsequent production of lithium batteries by the lamination process; it can effectively increase production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the lithium battery pole piece substrate of the utility model;

[0022] Figure 2 It is the AA cross-sectional view of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the utility model after the initial pole pieces are separated;

[0024] Figure 4 This is a schematic diagram of the final pole piece structure of the utility model;

[0025] Description of reference numerals:

[0026] 100, initial electrode piece; 110, pretreatment section; 111, thinning area; 1110, thinning section; 112, gap area; 120, coating area; 130, electrode ear pretreatment area; 131, electrode ear; 132, residual material area. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] For example, please refer to Figure 1 As shown:

[0031] A substrate for making a lithium battery pole piece, comprising a plurality of initial pole pieces 100; the initial pole pieces 100 are arranged in sequence in a transverse direction; a pretreatment portion 110 is formed between adjacent initial pole pieces 100; the plurality of initial pole pieces 100 are a complete whole before being cut; the initial pole piece 100 comprises adjacently arranged pole ear pretreatment areas 130 and a coating area 120 for coating an electrode material; each coating area 120 is located on the same side of the initial pole piece 100; by performing a large-scale coating process of the electrode material on the coating area 120 of the original substrate, the time for coating the electrode material can be saved;

[0032] A pretreatment portion 110 is formed between adjacent initial pole pieces 100, and the pretreatment portion 110 is arranged along the length direction of the initial pole piece 100; the pretreatment portion 110 includes a plurality of gap areas 112 and a plurality of thinning areas 111; the pretreatment portion 110 is mainly used to quickly separate adjacent initial pole pieces 100; the thickness of the thinning area 111 is lower than the thickness of the initial pole piece 100, so when an external force is applied to pull outward, the adjacent initial pole pieces 100 can be easily separated; the gap area 112 generally refers to a hollow portion, and the gap area 112 is spaced apart from the thinning area 111, so that The connection strength between adjacent initial pole pieces 100 is greatly reduced, so that the initial pole pieces 100 can be quickly separated by pulling; the gap area 112 can be prefabricated in advance by stamping or die cutting; the thinning area 111 can also be formed in advance by stamping, and the purpose of stamping is to reduce the thickness of the thinning area 111, but it still maintains a certain structural strength; in one embodiment, the gap area 112 and the thinning area 111 can be processed in the same step, for example, punching heads of different heights are set at intervals, so that the punching part forms the gap area 112, and the thinning part forms the thinning area 111.

[0033] In one embodiment, Figure 1 The structure in is illustrated as an example, the substrate includes three initial pole pieces 100 arranged in sequence laterally, and two pretreatment parts 110 arranged between adjacent initial pole pieces 100; the pretreatment part 110 includes three thinning areas 111, which are respectively arranged at the upper and lower ends and the middle part of the pretreatment part 110; a gap area 112 is formed between adjacent thinning areas 111; the width of the pretreatment part 110 is preferably 1-3mm, and the width of the pretreatment part 110 can also exceed 3mm, but after exceeding 3mm, the amount of waste formed is large, which will increase the production cost; the length of the thinning area 111 is preferably set at 10-20mm, within this range, it can avoid that the force required for the thinning area 111 to tear and break is too large, and it can also avoid that the substrate breaks prematurely during the process of transmitting and coating the electrode material; the thinning area 111 is mainly used to connect the adjacent initial pole pieces 100 before breaking, so that the substrate can be coated with the electrode material in the form of an integral whole, ensuring the uniformity and consistency of the electrode material coating;

[0034] In one embodiment, if Figure 2 As shown, both upper and lower sides of the thinning area 111 are thinned to form a thinning portion 1110; the thinning portion 1110 is symmetrically arranged up and down; the cross section of the thinning portion 1110 ( Figure 2 The cross section shown) is V-shaped, U-shaped or inverted trapezoidal; Figure 2 The thinning portion 1110 is U-shaped; the specific shape depends on the shape of the die head during stamping; in another embodiment, the thinning portion 1110 can also be set only on one side;

[0035] In one embodiment, if Figure 1 As shown, the coating area 120 is located below the initial electrode 100; the tab pretreatment area 130 is located above the coating area 120 and is adjacent to the coating area 120; the tab pretreatment area 130 includes a residual material area 132 and a tab 131; the residual material area 132 is waste material that needs to be cut off, and the tab 131 part is retained after cutting off the residual material area 132; in one embodiment, the residual material area 132 is located on both sides of the tab 131, that is, there is a residual material area 132 on each side of the tab 131; the residual material areas 132 on the left and right sides of the tab 131 can be symmetrically distributed or asymmetrically distributed; in one embodiment, when the tab 131 is located at the edge, only one residual material area 132 is provided;

[0036] The upper part of the substrate forms a pole ear 131 and a residual material area 132 located on the left and right sides of the pole ear 131. The residual material area 132 and the thinning area 111 together constitute a waste area. In the subsequent stamping process, the waste area will be stamped and cut off, leaving only the pole ear 131 part. The adjacent initial pole piece 100 will be separated by pulling; in the subsequent process, it will be cut by laser cutting. Figure 3 The pre-treated portion 110 of the redundant thinning area 111 is cut off, thereby leaving a single electrode sheet (such as Figure 4 As shown), it is convenient for the subsequent lamination process to form a lithium battery.

[0037] Using the substrate structure of the utility model, the electrode material is first coated on the coating area 120 during production. Since the substrate is a whole, it can be continuously coated on the conveyor belt. The three thinning areas 111 have the function of connecting adjacent initial pole pieces 100 and ensure the stability of the connection. After the electrode material is coated, in a production process, the adjacent initial pole pieces can be pulled apart to form a Figure 3 The structure shown still retains excess thinning area 111, which is removed by laser cutting, and the top excess material area 132 is removed by stamping. It can be found that the height of the top excess material area is greater than the height of the thinning area 111. Therefore, when the excess material area 132 is stamped and cut off, the two thinning areas 111 have been cut off. In the subsequent laser cutting, the number of thinning areas 111 that need to be cut is reduced, thereby improving production efficiency.

[0038] By performing a large-scale electrode material coating process on the coating area 120 of the original substrate, the time for coating the electrode material can be saved. After coating, due to the presence of the thinning area 111, the adjacent electrode substrates can be easily pulled and disconnected along the thinning area 111, and then the residual material area 132 can be cut off in large quantities using a stamping process, leaving the pole ear 131 part; after the initial pole piece 100 is pulled and separated, the laser cutting process is used to cut off the excess pretreatment part 110 of the thinning area 111, and finally a single complete pole piece coated with electrode material is formed, which paves the way for the subsequent production of lithium batteries using a lamination process; it can effectively increase production efficiency.

[0039] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A substrate for making a lithium battery pole piece, characterized in that: The invention comprises a plurality of initial pole pieces (100); the initial pole pieces (100) are arranged in sequence in a transverse direction; the initial pole pieces (100) comprise adjacently arranged pole ear pretreatment areas (130) and a coating area (120) for coating electrode materials; the pole ear pretreatment areas (130) are cut off with a residual material area (132) to form pole ears (131); a pretreatment section (110) is formed between adjacent initial pole pieces (100); the pretreatment section (110) is arranged along the length direction of the initial pole piece (100); the pretreatment section (110) comprises a plurality of gap areas (112) and a plurality of thinning areas (111) for quickly breaking two adjacent initial pole pieces (100) when the two initial pole pieces (100) are pulled by an external force to separate the two initial pole pieces (100); the thickness of the thinning area (111) is lower than the thickness of the initial pole piece (100).

2. The substrate for making a lithium battery pole piece according to claim 1, characterized in that: The coating area (120) is located below the initial pole piece (100); the pole tab pretreatment area (130) is located above the coating area (120); and the residual material area (132) is located on both sides of the pole tab (131).

3. The substrate for making a lithium battery pole piece according to claim 2, characterized in that: The residual material area (132) is symmetrically or asymmetrically arranged on both sides of the pole ear (131).

4. The substrate for making a lithium battery pole piece according to claim 1, characterized in that: The upper and lower sides of the thinned area (111) are thinned to form a thinned portion (1110).

5. The substrate for making a lithium battery pole piece according to claim 4, characterized in that: The thinning portions (1110) on the upper and lower sides of the thinning zone (111) are symmetrically arranged; the cross-sectional shape of the thinning portion (1110) is V-shaped, U-shaped, or inverted trapezoidal.

6. The substrate for making a lithium battery pole piece according to claim 1, characterized in that: The gap area (112) and the thinning area (111) are arranged at intervals.

7. The substrate for making a lithium battery pole piece according to claim 6, characterized in that: The thinning areas (111) include three, which are respectively arranged at the upper and lower ends and the middle part of the pretreatment part (110); gap areas (112) are formed between adjacent thinning areas (111); and the gap areas (112) are hollow parts.

8. The substrate for making a lithium battery pole piece according to claim 7, characterized in that: The length of the thinned area (111) is 10-20 mm.

9. The substrate for making a lithium battery pole piece according to claim 1, characterized in that: The width of the pretreatment portion (110) is 1-3 mm.

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