Composite current collector convenient to weld, electrode plate and battery

Abstract

The utility model discloses a composite current collector convenient to weld, an electrode plate and a battery, a plurality of composite current collectors form a composite current collector lamination unit in a lamination form, and the composite current collector lamination unit forms a battery current collector assembly structure; a hole cavity is formed in the composite current collector lamination unit, the hole cavity penetrates through each composite current collector in the composite current collector lamination unit, a hole cavity channel is provided with at least one inclined side surface, and each composite current collector in the composite current collector lamination unit is sequentially exposed in a step shape at the inclined side surface of the hole cavity channel. Compared with the traditional composite current collector structure, the composite current collector disclosed by the utility model has the advantages that the welding times can be reduced, the scheme process is simplified, the production efficiency is improved, heat at the joint of the composite current collector can be effectively dissipated through the arrangement of the hole cavities, and the safety performance of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a composite current collector, electrode sheet, and battery that are easy to weld. Background Technology

[0002] Composite current collectors are composite materials consisting of a metal layer, a polymer layer, and another metal layer. Currently, composite current collectors are gradually replacing traditional metal current collectors such as copper foil current collectors and aluminum foil current collectors. In the structure of a composite current collector, the middle layer is a polymer layer, with a metal layer on top and bottom. The advantages of using this type of current collector are that it can significantly improve battery safety, reduce battery weight, and increase energy density.

[0003] However, compared to traditional pure metal foil, this type of current collector requires an additional transfer welding process during use. That is, the metal foil needs to be placed on both sides of the composite current collector, and then welding methods such as ultrasonic welding are used to connect the metal foil and the composite current collector to achieve the purpose of current conduction. During welding, the tabs of each composite current collector need to be welded individually, resulting in lower production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a composite current collector, electrode sheet, and battery that are easy to weld. By improving the structure of the composite current collector, welding can be made more convenient.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] The first aspect of this application provides a composite current collector that is easy to weld, wherein a plurality of composite current collectors are stacked in the form of a composite current collector stack unit, and the composite current collector stack unit forms a battery current collector assembly structure.

[0007] The composite current collector stack unit is provided with a cavity, which connects each composite current collector in the composite current collector stack unit. The opening on the first composite current collector is the first opening of the composite current collector stack unit, and the opening on the last composite current collector is the second opening of the composite current collector stack unit.

[0008] The space between the first opening and the second opening of the composite current collector stack unit is a cavity channel. The cavity channel has at least one inclined side, and each composite current collector in the composite current collector stack unit is exposed in a stepped manner on the inclined side of the cavity channel.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] The composite current collector laminated unit is welded at the inclined side of the hole cavity channel by a first metal sheet, the first metal sheet covers the inclined side of the hole cavity channel, and the exposed parts of the composite current collectors are welded with the first metal sheet.

[0011] Further, the hole cavity channel has a plurality of inclined sides, each of which is covered by a corresponding first metal sheet, and the exposed parts of the composite current collectors on the inclined side are welded with the first metal sheet.

[0012] The first metal sheet has a first opening and a second opening at two ends, or the two ends of the first metal sheet are flush with the first opening and the second opening.

[0013] Further, the current collector assembly structure of the battery comprises one or more composite current collector laminated units.

[0014] When the current collector assembly structure of the battery comprises a plurality of composite current collector laminated units, the plurality of composite current collector laminated units are stacked in sequence, and the composite current collector laminated units are welded and connected.

[0015] The welding between the composite current collector laminated units is to weld the first metal sheets close to the ends of the two adjacent composite current collector laminated units together.

[0016] Alternatively, the welding between the composite current collector laminated units is to arrange a second metal sheet between the first metal sheets of the two adjacent composite current collector laminated units, so that the second metal sheet is welded with the first metal sheets of the two adjacent composite current collector laminated units.

[0017] The second aspect of the present application provides an electrode sheet containing the composite current collector provided by the first aspect of the present application.

[0018] The third aspect of the present application provides a battery containing the electrode sheet provided by the second aspect of the present application.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] The plurality of composite current collectors form a composite current collector laminated unit in the form of laminated sheets, the composite current collector laminated unit forms a battery current collector assembly structure, and the battery current collector assembly structure comprises at least one composite current collector laminated unit.

[0021] The composite current collector lamination unit can be integrally welded, the hole cavity channel of each composite current collector in the through composite current collector lamination unit has at least one inclined side, and each composite current collector in the composite current collector lamination unit is exposed in a stepped manner at the inclined side of the hole cavity channel, and the exposed parts of each composite current collector are welded and connected through a metal sheet at each inclined side.

[0022] The hole cavity channel of each composite current collector in the through composite current collector lamination unit can have a plurality of inclined sides, such as two, three, four inclined sides, etc., and the exposed parts of each composite current collector on each inclined side are welded and connected through a metal sheet.

[0023] The composite current collector can be formed by punching to form a hole cavity, and a plurality of composite current collectors are welded and connected through a metal sheet, compared with the traditional composite current collector structure, the side does not need to be connected in sequence through the adapter welding metal sheet, and the scheme process of the utility model is simplified, and the production efficiency is improved.

[0024] The composite current collector is formed by forming a hole cavity, compared with the traditional adapter welding method, heat at the connecting position between the composite current collectors can be effectively dissipated, and the safety performance of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The existing composite current collector adapter welding cross-sectional enlarged structure schematic view.

[0026] Figure 2 The cross-sectional structure schematic view of one embodiment of the hole cavity of the composite current collector convenient for welding.

[0027] Figure 3 The top view structure schematic view of one embodiment of the hole cavity of the composite current collector convenient for welding.

[0028] Figure 4 The cross-sectional structure schematic view of another embodiment of the hole cavity of the composite current collector convenient for welding.

[0029] Figure 5 The cross-sectional structure schematic view of another embodiment of the hole cavity of the composite current collector convenient for welding.

[0030] Figure 6 The top view structure schematic view of another embodiment of the hole cavity of the composite current collector convenient for welding.

[0031] Figure 7 The top view structure schematic view of another embodiment of the hole cavity of the composite current collector convenient for welding.

[0032] Figure 8 The whole structure schematic diagram of one embodiment of the composite current collector convenient for welding.

[0033] In the figure: 1-composite current collector, 2-metal sheet for adapter welding, 3-hole cavity, 4-step-shaped exposed part of the composite current collector, 5-first metal sheet, 6-tab. DETAILED DESCRIPTION

[0034] The above content of the utility model will be further explained in the form of examples, but this should not be understood as the scope of the above subject matter of the utility model is limited to the following examples, and any technology realized based on the above content of the utility model belongs to the scope of the utility model.

[0035] In the description of the utility model, it also needs to be explained that:

[0036] The orientation or positional relationship therein is based on the relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, terms such as "first, second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0037] The utility model provides a kind of composite current collector convenient for welding, and the composite current collector 1 of several composite current collectors 1 is formed into composite current collector lamination unit in the form of lamination, and composite current collector lamination unit constitutes battery current collector assembly structure;

[0038] Hole cavity 3 is provided in the composite current collector lamination unit, and hole cavity 3 penetrates each composite current collector 1 in the composite current collector lamination unit, and the opening of hole cavity 3 on the first composite current collector 1 in it is composite current collector lamination unit first opening, and the opening on the last composite current collector 1 is composite current collector lamination unit second opening;

[0039] Composite current collector lamination unit first opening to composite current collector lamination unit second opening is hole cavity channel, and hole cavity channel has at least one inclined side, and each composite current collector 1 in the composite current collector lamination unit is exposed in step at the inclined side of hole cavity channel.

[0040] The structure of connecting multiple composite current collectors 1 adapter welding as shown in Figure 1 The side of composite current collector 1 is sequentially provided with metal sheet 2 for adapter welding, and each composite current collector is connected by each metal sheet 2 for adapter welding, and multiple metal sheets need to be set and welded respectively.

[0041] The composite current collector stacked unit of this utility model can be welded as a whole. The composite current collector stacked unit of this utility model is welded to a whole by a first metal sheet 5 at the inclined side of the cavity channel. The first metal sheet 5 covers the inclined side of the cavity channel. The stepped exposed part 4 of each composite current collector is welded to the first metal sheet 5 respectively. The cavity channel of each composite current collector in the composite current collector stacked unit has at least one inclined side. Each composite current collector in the composite current collector stacked unit is exposed in a stepped manner at the inclined side of the cavity channel. At each inclined side, a metal sheet is welded to the exposed part of each composite current collector.

[0042] In some embodiments, the cavity channel has several inclined sides, and the inclination direction of each inclined side may be different. Each inclined side is covered by a first metal sheet 5, and each first metal sheet 5 is welded to the exposed part of each composite current collector on its inclined side.

[0043] In this invention, the cavity of each composite current collector in the stacked composite current collector unit can have multiple inclined sides, such as two, three, or four inclined sides. Each inclined side is connected by a metal sheet to weld the exposed parts of each composite current collector on that side.

[0044] like Figure 2 The diagram shown is a cross-sectional view of a cavity channel with an inclined side. The stepped exposed portions 4 of the composite current collectors on the inclined side are welded together using a first metal sheet 5. Figure 2 To illustrate the welding position, the first metal sheet 5 and the stepped exposed portion 4 of the composite current collector are separated for illustration.

[0045] like Figure 3 The diagram shown is a top view of a cavity channel with an inclined side.

[0046] like Figure 4 The diagram shown is a cross-sectional view of a cavity channel with two parallel inclined sides. A first metal sheet 5 is welded to each inclined side. Its top view is similar to... Figure 2 It is similar, but from its upward angle, another sloping side can be seen.

[0047] like Figure 5 The diagram shown is a cross-sectional view of a cavity channel having two non-parallel inclined sides, with a first metal sheet 5 welded to each inclined side. Figure 6 yes Figure 5 A top view of the structure.

[0048] like Figure 7As shown, it is a top view schematic diagram of the hole cavity channel having four inclined sides, and each inclined side is welded with the first metal sheet 5, and the cross-sectional view schematic diagram is similar to Figure 5 .

[0049] The hole cavity 3 in the composite current collector of the utility model can be obtained by punching, and the hole cavity 3 can be punched at the reserved tab 6 of the composite current collector, as shown, or directly punched at the edge of the composite current collector, and the position of the hole cavity 3 can be set according to the use requirement of assembling different batteries. Figure 8

[0050] The current collector assembly structure of the battery comprises one or more composite current collector laminated units.

[0051] When the current collector assembly structure of the battery comprises a plurality of composite current collector laminated units, the plurality of composite current collector laminated units are sequentially stacked, and each composite current collector laminated unit is welded and connected.

[0052] In some embodiments, the welding between each composite current collector laminated unit is to weld the proximal ends of the first metal sheets 5 in the adjacent two composite current collector laminated units together.

[0053] In other embodiments, the welding between each composite current collector laminated unit is to set a second metal sheet between the first metal sheets 5 of the adjacent two composite current collector laminated units, so that the second metal sheet is welded with the first metal sheets 5 of the adjacent two composite current collector laminated units respectively.

[0054] For example, in the case that the first metal sheets 5 in the adjacent two composite current collector laminated units are not on the same inclined side of the hole cavity channel, a second metal sheet can also be additionally arranged between the adjacent two composite current collector laminated units, so that the second metal sheet is welded with the first metal sheets 5 of the adjacent two composite current collector laminated units respectively.

[0055] The two ends of the first metal sheet 5 respectively protrude out of the first opening and the second opening, or the two ends of the first metal sheet 5 are flush with the first opening and the second opening, and when it is required to connect the first metal sheet 5 with the adjacent two composite current collector laminated units, the end portion of the first metal sheet 5 protruding out of the first opening or the second opening can be welded and connected.

[0056] The utility model also provides an electrode sheet, and the electrode sheet comprises the above-mentioned composite current collector which is convenient to weld.

[0057] The utility model also provides a battery, and the battery comprises the above-mentioned electrode sheet.

[0058] The utility model also provides a power utilization device, and the power utilization device adopts the above-mentioned battery.

[0059] ​Compared with the traditional multiple composite current collectors which are connected in sequence through metal sheet adapter welding on the side surface, the composite current collector of the utility model not only reduces the welding times, simplifies the scheme process and improves the production efficiency, but also can effectively release the heat at the connection of the composite current collector through the setting of the hole cavity, and improves the safety performance of the battery.

[0060] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any skilled person in the art, without departing from the technical scheme range of the utility model, according to the technical essence of the utility model, any simple modification, equivalent replacement and improvement of the above embodiment, etc. still belong to the protection range of the technical scheme of the utility model.

Claims

1. A composite current collector for facilitating welding, characterized by: Several composite current collectors are arranged in the form of a stack to form a composite current collector stack unit, and the composite current collector stack unit forms a battery current collector assembly structure; A hole cavity is arranged in the composite current collector stack unit, the hole cavity penetrates each composite current collector in the composite current collector stack unit, the opening of the hole cavity on the first composite current collector is a first opening of the composite current collector stack unit, and the opening of the hole cavity on the last composite current collector is a second opening of the composite current collector stack unit; The hole cavity channel between the first opening of the composite current collector stack unit and the second opening of the composite current collector stack unit has at least one inclined side, and each composite current collector in the composite current collector stack unit is exposed in a stepped manner at the inclined side of the hole cavity channel.

2. The composite current collector for ease of welding of claim 1, wherein: The composite current collector stack unit is welded at the inclined side of the hole cavity channel by a first metal sheet, the first metal sheet covers the inclined side of the hole cavity channel, and the exposed parts of each composite current collector are welded to the first metal sheet.

3. The composite current collector for ease of welding of claim 2, wherein: The hole cavity channel has several inclined sides, and each inclined side is covered by a corresponding first metal sheet, and each first metal sheet is welded to the exposed part of each composite current collector on the inclined side.

4. The composite current collector for ease of welding of claim 2, wherein: The two ends of the first metal sheet respectively extend out of the first opening and the second opening, or the two ends of the first metal sheet are flush with the first opening and the second opening.

5. The composite current collector for ease of welding of claim 1, wherein: The battery current collector assembly structure comprises one or more composite current collector stack units.

6. The composite current collector for ease of welding of claim 1, wherein: When the battery current collector assembly structure comprises a plurality of composite current collector stack units, the plurality of composite current collector stack units are stacked in sequence, and each composite current collector stack unit is welded to the adjacent composite current collector stack unit.

7. The composite current collector for ease of welding of claim 6, wherein: The welding between each composite current collector stack unit is to weld the proximal ends of the first metal sheets in the adjacent two composite current collector stack units together.

8. The composite current collector for ease of welding of claim 6, wherein: The welding between each composite current collector stack unit is to arrange a second metal sheet between the first metal sheets of the adjacent two composite current collector stack units, so that the second metal sheet is welded to the first metal sheets of the adjacent two composite current collector stack units, respectively.

9. An electrode tab, characterized by: The composite current collector is convenient to weld, and the composite current collector comprises the battery electrode sheet.

10. A battery, characterized by: The electrode sheet comprises the composite current collector.

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