Pole piece structure based on composite current collector, roll core and battery

Abstract

The utility model discloses a pole piece structure based on a composite current collector, a roll core and a battery, and the pole piece structure based on the composite current collector comprises the composite current collector, a tab; the pole piece structure based on the composite current collector is simple in structure and low in processing difficulty, and is favorable for realizing the goals of light weight, low cost and high energy density. The roll core comprises a diaphragm and the pole piece structure based on the composite current collector, and the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked and wound to form a roll core body; after winding, the first negative tab and the second negative tab are connected to form a negative tab; the whole structure and the processing technology of the roll core are simple, the cost is reduced, and the production efficiency is improved. The battery comprises the roll core; the battery provided by the utility model adopts the roll core, the whole structure and the processing technology are simple, the cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of pole piece structure based on composite current collector, roll core and battery. BACKGROUND

[0002] Composite current collector is the " sandwich " structure of metal layer in two sides, middle high molecular layer, because its safety, lightweight, toughness, energy density, low cost and many other advantages, composite current collector is gradually entering industrialization era. Since the middle high molecular layer of composite current collector is not conductive, welding is difficult to realize the conduction of upper and lower two metal layers, and then cannot complete the effective output of electron, therefore, tab welding is a big technical difficulty.

[0003] The existing tab welding mode is usually to use adapter welding in the electric core of the laminated structure, that is, to weld metal connecting pieces on the metal layers of the two sides of the current collector respectively, and then to weld all the metal connecting pieces together to form an electronic path. The technical scheme of adapter welding introduces two layers of metal connecting pieces, thereby increasing the weight and cost on the basis of the composite structure of the current collector, and occupying a large space. This welding method is relatively complex, the welding efficiency is low, the welding quality is difficult to guarantee, and it deviates from the goal of lightweight, low cost and high energy density of composite current collector.

[0004] CN116864927A discloses an electrode pole piece, roll core and application, electrode tab is arranged at the opposite side of current collector, and realizes the coincidence alignment in vertical direction after the winding of opposite side tab; in the technical scheme, the first positive tab and the second positive tab in the wound positive pole piece are welded to obtain a positive tab, and the first negative tab and the second negative tab in the wound negative pole piece are welded to obtain a negative tab. The pole tab structure and the overall processing technology are still relatively complex. UTILITY MODEL CONTENTS

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a pole piece structure based on composite current collector, the two ends of the tab are connected with one of the first light foil area and one of the second light foil area respectively, to realize the conduction of composite current collector, with low processing difficulty, which is conducive to achieving the goals of lightweight, low cost and high energy density.

[0006] The second purpose of the utility model is to provide a roll core, which is formed by sequentially stacking and winding the positive pole piece, the separator and the negative pole piece to form a roll core body. After winding, only the first negative tab and the second negative tab need to be connected to form a negative tab. The overall structure and processing technology are simple, which is conducive to reducing cost and improving production efficiency.

[0007] The battery of the utility model discloses has the advantages of adopting the above-mentioned roll core, simple overall structure and processing technology, being favorable for reducing cost and improving production efficiency.

[0008] One of the purposes of the utility model is realized by adopting the following technical scheme:

[0009] A pole piece structure based on a composite current collector, comprising:

[0010] The composite current collector is provided with a first light foil area and a first coating area at intervals along the length direction of the first surface, and the second surface of the composite current collector is provided with a second light foil area and a second coating area at intervals along the length direction.

[0011] The pole lug is connected to one of the first light foil areas at one end, and the other end of the pole lug is connected to one of the second light foil areas, so as to conduct the composite current collector.

[0012] In a preferred embodiment, the composite current collector comprises a first metal layer, an intermediate polymer layer and a second metal layer arranged in sequence, the first metal layer is arranged on the first surface of the intermediate polymer layer, and the second metal layer is arranged on the second surface of the intermediate polymer layer.

[0013] The first surface of the intermediate polymer layer and the second surface of the intermediate polymer layer are respectively two surfaces opposite to the arrangement positions of the intermediate polymer layer.

[0014] In a preferred embodiment, the first surface of the composite current collector and the second surface of the composite current collector are respectively two surfaces opposite to the arrangement positions of the composite current collector.

[0015] In a preferred embodiment, the pole lug is provided with one, which is a positive pole lug, and forms a positive pole piece after being connected to the composite current collector.

[0016] Or, the pole lug is provided with two, which are a first negative pole lug and a second negative pole lug, and forms a negative pole piece after being connected to the composite current collector.

[0017] In a preferred embodiment, the first surface of the composite current collector is provided with at least two first coating areas and at least three first light foil areas at intervals along the length direction, and the second surface of the composite current collector is provided with at least two second coating areas and at least three second light foil areas at intervals along the length direction.

[0018] One end of the positive pole lug is welded to the first light foil area located at or close to the middle position, and the other end of the positive pole lug is welded to the second light foil area located at or close to the middle position, so as to conduct the composite current collector.

[0019] In a preferred embodiment, the first surface of the composite current collector is provided with at least one first coating area and at least two first light foil areas along the length direction thereof, and the second surface of the composite current collector is provided with at least one second coating area and at least two second light foil areas along the length direction thereof;

[0020] One end of the first negative tab is welded to the first light foil area at the head end position, and the other end of the first negative tab is welded to the second light foil area at the head end position, so as to conduct the composite current collector;

[0021] One end of the second negative tab is welded to the first light foil area at the tail end position, and the other end of the second negative tab is welded to the second light foil area at the tail end position, so as to conduct the composite current collector.

[0022] In a preferred embodiment, the tab has a whole shape of a "U" letter or a "V" letter.

[0023] The second purpose of the utility model is achieved by the following technical scheme:

[0024] A roll core comprises a diaphragm and the above-mentioned pole piece structure based on the composite current collector, and the positive pole piece, the diaphragm and the negative pole piece are sequentially laminated and wound to form a roll core body.

[0025] After winding, the first negative tab and the second negative tab are connected to form a negative tab.

[0026] In a preferred embodiment, the positive tab and the negative tab are arranged on two sides of the roll core body, respectively.

[0027] The third purpose of the utility model is achieved by the following technical scheme:

[0028] A battery comprises the above-mentioned roll core.

[0029] In summary, the utility model has the following technical effects:

[0030] 1. The pole piece structure based on the composite current collector in the utility model has a simple structure, the two ends of the tab are connected with one of the first light foil areas and one of the second light foil areas, respectively, the composite current collector is conducted, the processing difficulty is low, and the lightweight, low-cost and high energy density target can be achieved.

[0031] 2. The roll core in the utility model is sequentially laminated and wound to form a roll core body by the positive pole piece, the diaphragm and the negative pole piece, after winding, only the first negative tab and the second negative tab need to be connected to form a negative tab, the overall structure and the processing technology are simple, the cost can be reduced, and the production efficiency can be improved.

[0032] 3. The battery in the utility model adopts the above-mentioned roll core, the overall structure and the processing technology are simple, the cost can be reduced, and the production efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Structure diagram of the composite current collector from the top view angle of the embodiment 1 of the utility model;

[0034] Figure 2 Structure diagram of the positive plate from the top view angle of the embodiment 1 of the utility model;

[0035] Figure 3 Structure diagram of the positive plate from the bottom view angle of the embodiment 1 of the utility model;

[0036] Figure 4 Structure diagram of the positive plate from the side view angle of the embodiment 1 of the utility model;

[0037] Figure 5 Structure diagram of the negative plate from the top view angle of the embodiment 1 of the utility model;

[0038] Figure 6 Structure diagram of the negative plate from the bottom view angle of the embodiment 1 of the utility model;

[0039] Figure 7 Structure diagram of the negative plate from the side view angle of the embodiment 1 of the utility model;

[0040] Figure 8 Structure diagram of the winding core from the top view angle of the embodiment 2 of the utility model;

[0041] Figure 9 Structure diagram of the winding core from the bottom view angle of the embodiment 2 of the utility model;

[0042] Figure 10 Structure diagram of the winding core from the side view angle of the embodiment 2 of the utility model;

[0043] Figure 11 Structure diagram of the battery of the embodiment 3 of the utility model.

[0044] Wherein, the meaning of the reference signs is as follows:

[0045] 10, composite current collector, 101, first metal layer, 102, intermediate polymer layer, 103, second metal layer, 20, first light foil area, 30, first coating area, 40, second light foil area, 50, second coating area, 60, positive tab, 70, negative tab, 701, first negative tab, 702, second negative tab, 80, positive plate, 90, negative plate, 100, separator. DETAILED DESCRIPTION

[0046] In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below by combining the drawings in the embodiments of the utility model.

[0047] In the description of the utility model, it needs to explain, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore it cannot be understood as the limitation of the utility model.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0049] Embodiment 1

[0050] Referring to Figures 1-7 The utility model discloses a kind of pole piece structures based on composite current collector, comprising: composite current collector 10, first surface of composite current collector 10 is spaced apart and is provided with first light foil area 20 and first coating area 30 along its length direction, second surface of composite current collector 10 is spaced apart and is provided with second light foil area 40 and second coating area 50 along its length direction;Tab, one end of tab is connected in one of first light foil area 20, the other end of tab is connected in one of second light foil area 40, to lead through composite current collector 10.

[0051] It needs to be explained that the area that first surface of composite current collector 10 is coated with slurry forms first coating area 30, the area that first surface of composite current collector 10 is not coated with slurry forms first light foil area 20, the area that second surface of composite current collector 10 is coated with slurry forms second coating area 50, the area that second surface of composite current collector 10 is not coated with slurry forms second light foil area 40, slurry coated on first surface of composite current collector 10 and second surface of composite current collector 10 can be selected from existing material, for example: positive electrode slurry includes positive electrode material, first conductive agent, first binder, solvent NMP;The mass ratio of the positive electrode material, the first conductive agent, the first binder is 95~99:1~3.5:0.5~1.5;Negative electrode slurry includes negative electrode material, second conductive agent, second binder, solvent;The mass ratio of the negative electrode material, the second conductive agent, the second binder is 95~99:0.3~2:1~3.5.

[0052] The pole piece structure based on the composite current collector has simple structure, the two ends of the pole lug are connected with one of the first light foil area 20 and one of the second light foil area 40 respectively, realizes conduction of the composite current collector 10, has low processing difficulty, and is beneficial to realization of the lightweight, low cost and high energy density target.

[0053] In the patent embodiment of the utility model, the composite current collector 10 includes first metal layer 101, intermediate macromolecular layer 102 and second metal layer 103 which are sequentially stacked, first metal layer 101 is arranged at the first surface of intermediate macromolecular layer 102, and second metal layer 103 is arranged at the second surface of intermediate macromolecular layer 102.

[0054] Specifically, the composite current collector 10 can be selected from the existing composite current collector 10, the first metal layer 101 is aluminum foil (positive current collector) / copper foil (negative current collector), the intermediate macromolecular layer 102 is polyimide (PI) material, and the second metal layer 103 is aluminum foil (positive current collector) / copper foil (negative current collector).

[0055] Specifically, the intermediate macromolecular layer 102 is sheet-shaped, and the first surface of the intermediate macromolecular layer 102 and the second surface of the intermediate macromolecular layer 102 are both surfaces with larger surface area of the intermediate macromolecular layer 102, for example, the front surface of the intermediate macromolecular layer 102 and the back surface of the intermediate macromolecular layer 102.

[0056] In the patent embodiment of the utility model, the first surface of the composite current collector 10 and the second surface of the composite current collector 10 are respectively two surfaces of the composite current collector 10 opposite in the setting position.

[0057] Specifically, the composite current collector 10 is sheet-shaped, and the first surface of the composite current collector 10 and the second surface of the composite current collector 10 are both surfaces with larger surface area of the composite current collector 10, for example, the front surface of the composite current collector 10 and the back surface of the composite current collector 10.

[0058] In the patent embodiment of the utility model, the pole lug is provided with one, which is a positive pole lug 60, and forms a positive pole piece 80 after being connected with the composite current collector 10; or, the pole lug is provided with two, which are a first negative pole lug 701 and a second negative pole lug 702, and forms a negative pole piece 90 after being connected with the composite current collector 10.

[0059] That is, by setting the number and position of the pole lug and corresponding first coating area 30, first light foil area 20, second coating area 50 and second light foil area 40, the pole piece structure based on the composite current collector can obtain the positive pole piece 80 or the negative pole piece 90.

[0060] Specifically, the material of the positive tab 60 is preferably aluminum, and the size of the positive tab 60 is preferably: length* width: 80mm*5mm; the material of the first negative tab 701 and the second negative tab 702 is preferably copper plated with nickel, and the size of the first negative tab 701 and the second negative tab 702 is the same, which is preferably: length* width: 78mm*5mm;

[0061] In the patent embodiment of the utility model, the first surface of the composite current collector 10 is provided with at least two first coating areas 30 and at least three first light foil areas 20 along the length direction thereof, the second surface of the composite current collector 10 is provided with at least two second coating areas 50 and at least three second light foil areas 40 along the length direction thereof; one end of the positive tab 60 is welded to the first light foil area 20 located at the middle position or close to the middle position, and the other end of the positive tab 60 is welded to the second light foil area 40 located at the middle position or close to the middle position, so as to conduct the composite current collector 10.

[0062] Preferably, referring to Figures 2-4 , the first surface of the composite current collector 10 is provided with two first coating areas 30 and three first light foil areas 20 along the length direction thereof, the second surface of the composite current collector 10 is provided with two second coating areas 50 and three second light foil areas 40 along the length direction thereof, one end of the positive tab 60 is welded to the first light foil area 20 located at the middle position, and the other end of the positive tab 60 is welded to the second light foil area 40 located at the middle position, so as to conduct the composite current collector 10.

[0063] In the patent embodiment of the utility model, the first surface of the composite current collector 10 is provided with at least one first coating area 30 and at least two first light foil areas 20 along the length direction thereof, the second surface of the composite current collector 10 is provided with at least one second coating area 50 and at least two second light foil areas 40 along the length direction thereof; one end of the first negative tab 701 is welded to the first light foil area 20 located at the first end position, and the other end of the first negative tab 701 is welded to the second light foil area 40 located at the first end position, so as to conduct the composite current collector 10; one end of the second negative tab 702 is welded to the first light foil area 20 located at the last end position, and the other end of the second negative tab 702 is welded to the second light foil area 40 located at the last end position, so as to conduct the composite current collector 10.

[0064] Preferably, referring to Figures 5-7The first surface of the composite current collector 10 is provided with a first coating area 30 and two first light foil areas 20 at intervals along the length direction, and the second surface of the composite current collector 10 is provided with a second coating area 50 and two second light foil areas 40 at intervals along the length direction; one end of the first negative tab 701 is welded to the first light foil area 20 at the first end position, and the other end of the first negative tab 701 is welded to the second light foil area 40 at the first end position, so as to conduct the composite current collector 10; one end of the second negative tab 702 is welded to the first light foil area 20 at the last end position, and the other end of the second negative tab 702 is welded to the second light foil area 40 at the last end position, so as to conduct the composite current collector 10.

[0065] That is, the setting position, the setting size and the setting number of the first coating area 30, the first light foil area 20, the second coating area 50 and the second light foil area 40 are determined according to the actual application scene, and are not limited.

[0066] In the patent embodiment of the utility model, the whole shape of the tab is "U" type or "V" type.

[0067] That is, the positive tab 60 extends from the first surface of the composite current collector 10 to the second surface of the composite current collector 10, so that one end of the positive tab 60 is welded to the first light foil area 20 at the middle position or close to the middle position, and the other end of the positive tab 60 is welded to the second light foil area 40 at the middle position or close to the middle position, so as to conduct the composite current collector 10 to form the positive tab 80.

[0068] That is, the first negative tab 701 extends from the first surface of the composite current collector 10 to the second surface of the composite current collector 10, so that one end of the first negative tab 701 is welded to the first light foil area 20 at the first end position, and the other end of the first negative tab 701 is welded to the second light foil area 40 at the first end position, so as to conduct the composite current collector 10; the second negative tab 702 extends from the first surface of the composite current collector 10 to the second surface of the composite current collector 10, so that one end of the second negative tab 702 is welded to the first light foil area 20 at the last end position, and the other end of the second negative tab 702 is welded to the second light foil area 40 at the last end position, so as to conduct the composite current collector 10, thereby forming the negative tab 90.

[0069] Embodiment 2

[0070] Referring to Figures 1-10 The utility model discloses a kind of roll cores, including diaphragm 100 and the pole piece structure based on composite current collector as described above, positive tab 80, diaphragm 100 and negative tab 90 are sequentially laminated and are wound to form roll core body;After winding, first negative tab 701 and second negative tab 702 are connected to form negative tab 70.

[0071] Preferably, the first negative tab 701 and the second negative tab 702 are welded to form the negative tab 70; of course, the first negative tab 701 and the second negative tab 702 can also be connected by other conductive ways to form the negative tab 70, which is determined according to the actual application scene and is not limited.

[0072] In the winding core in the utility model, the positive plate 80, the diaphragm 100 and the negative plate 90 are sequentially laminated and wound to form the winding core body, after winding is completed, only the first negative tab 701 and the second negative tab 702 need to be connected to form the negative tab 70, the overall structure and the processing technology are simple, the cost is reduced, and the production efficiency is improved.

[0073] In the utility model patent embodiment, the positive tab 60 and the negative tab 70 are arranged at two sides of the winding core body.

[0074] Therefore, the utility model is especially suitable for the winding core with the positive tab 60 and the negative tab 70 arranged at different sides, for example, the utility model is especially suitable for the winding core of a cylindrical battery.

[0075] The specific processing process of the winding core is as follows:

[0076] When winding starts, two diaphragms 100 are inserted into the winding needle at the same time, the diaphragm 100 is wound for several turns, and the specific number of turns is not limited; then the insertion end of the negative plate 90 is inserted between the two diaphragms 100, and winding starts, and the specific number of turns is not limited; finally, the insertion end of the positive plate 80 is inserted below one of the diaphragms 100, and winding starts until winding is completed; when cutting, the positive plate 80 is cut off first, then the negative plate 90 is cut off, and finally the diaphragm 100 is cut off, and the terminal adhesive tape is used for fixing; at the end of the winding core, the end positions of the positive plate 80 and the negative plate 90 are not limited.

[0077] The winding core structure is as shown in Figures 8-10 , and the position of the tab in the winding core after winding is as shown in Figures 8-10 .

[0078] The positive plate 80 and the negative plate 90 can realize the conduction of the metal layers on both sides of the high molecular layer of the composite current collector 10, and do not need to weld two tabs based on the tab structure of the composite current collector 10, the utility model greatly reduces the welding difficulty, and the problem of large welding internal resistance of the winding core can be solved by increasing the number of tabs, changing the material, shape, size or adjusting the position of the tab.

[0079] Embodiment 3

[0080] Referring to Figures 1-11 , the utility model discloses a kind of batteries, including above-mentioned winding core.

[0081] The battery adopts the winding core, the overall structure is simple in processing technology, cost reduction is facilitated, and production efficiency is improved.

[0082] The specific processing procedure of the battery is as follows:

[0083] Since one winding core has one positive pole lug 60 and two negative pole lugs 70, the first negative pole lug 701 and the second negative pole lug 702 are welded to form the negative pole lug 70, the positive pole lug 60 is welded with the positive pole busbar, the negative pole lug 70 is welded with the negative pole busbar, finally the busbar is welded with the cover cap and the steel shell, so that the welding of the battery cell is finally realized.

[0084] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the utility model, and these improvements and refinements are also regarded as the protection scope of the utility model.

Claims

1. A jelly-roll based electrode structure, characterized by, Comprise: A composite current collector, a first surface of the composite current collector is provided with a first light foil area and a first coating area at intervals along the length direction of the composite current collector, a second surface of the composite current collector is provided with a second light foil area and a second coating area at intervals along the length direction of the composite current collector; A tab, one end of the tab is connected to one of the first light foil areas, the other end of the tab is connected to one of the second light foil areas, so as to conduct the composite current collector.

2. The composite collector-based electrode tab structure of claim 1, wherein: The composite current collector comprises a first metal layer, an intermediate polymer layer and a second metal layer which are sequentially stacked, the first metal layer is arranged on the first surface of the intermediate polymer layer, and the second metal layer is arranged on the second surface of the intermediate polymer layer. The first surface of the intermediate polymer layer and the second surface of the intermediate polymer layer are respectively two surfaces of the intermediate polymer layer which are opposite to each other.

3. The composite collector-based pole piece structure of claim 1, wherein: The first surface of the composite current collector and the second surface of the composite current collector are respectively two surfaces of the composite current collector which are opposite to each other.

4. The composite current collector-based pole piece structure of claim 1, wherein: The tab is provided with one, which is a positive tab, and forms a positive plate after being connected to the composite current collector. Or, the tab is provided with two, which are a first negative tab and a second negative tab, and forms a negative plate after being connected to the composite current collector.

5. The composite current collector-based pole piece structure of claim 4, wherein: The first surface of the composite current collector is provided with two first coating areas and three first light foil areas at intervals along the length direction of the composite current collector, and the second surface of the composite current collector is provided with two second coating areas and three second light foil areas at intervals along the length direction of the composite current collector. One end of the positive tab is welded to the first light foil area located at or near the middle position, and the other end of the positive tab is welded to the second light foil area located at or near the middle position, so as to conduct the composite current collector.

6. The composite current collector based pole piece structure of claim 4, wherein: The first surface of the composite current collector is provided with one first coating area and two first light foil areas at intervals along the length direction of the composite current collector, and the second surface of the composite current collector is provided with one second coating area and two second light foil areas at intervals along the length direction of the composite current collector. One end of the first negative tab is welded to the first light foil area located at the head end position, and the other end of the first negative tab is welded to the second light foil area located at the head end position, so as to conduct the composite current collector. One end of the second negative tab is welded to the first light foil area located at the tail end position, and the other end of the second negative tab is welded to the second light foil area located at the tail end position, so as to conduct the composite current collector.

7. The composite collector-based pole piece structure of claim 1, wherein: The overall shape of the tab is "U" or "V".

8. A core, characterized by: Comprise a separator and the composite current collector-based tab structure of claim 4, the positive tab, the separator and the negative tab are sequentially stacked and wound to form a core body; After winding, the first negative tab and the second negative tab are connected to form a negative tab.

9. The core of claim 8, wherein: The positive tab and the negative tab are respectively arranged on two sides of the core body.

10. A battery, characterized by: Comprise the core of claim 9.

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