Pole piece, battery cell, battery, battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery assembling and manufacturing, in particular to a pole piece, a battery cell, a battery, a battery pack and electric equipment. The pole piece comprises a pole piece foil material and a tab foil material, the pole piece foil material comprises a base material and two plating layers, and the two plating layers are respectively positioned on two opposite sides of the base material; the tab foil material comprises an upper-layer foil material and a lower-layer foil material which are connected with each other; the upper-layer foil material is connected with one of the plating layers, the lower-layer foil material is connected with the other plating layer, and the upper-layer foil material and the lower-layer foil material are connected on the outer side of the pole piece foil material so as to conduct the plating layers on the two sides of the base material. The upper-layer foil and the lower-layer foil are arranged on the opposite sides of the pole piece foil, and the upper-layer foil, the pole piece foil and the lower-layer foil are connected through welding, so that conduction of plating layers on the two sides of the base material is realized, and compared with perforation welding, generated metal chips are few, and the short circuit problem is small. And moreover, the welding stability is high, the tab foils are arranged on the two sides of the tab, the overcurrent area is increased, the temperature rise during quick charging and quick discharging is reduced, and the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery assembly manufacturing, and particularly to an electrode sheet, an electrode core, a battery, a battery pack, and an electrical device. Background Art

[0002] At present, when a battery is assembled and manufactured, a single-layer light foil is usually welded on one side of an electrode sheet foil as an electrode tab. When the electrode sheet foil uses a PET foil, a perforation method is usually adopted in the welding area to achieve electrical conduction of the plating metals on both sides of the electrode sheet foil.

[0003] However, this perforation conduction structure has unstable connection during processing, and there is a large uncertainty in conduction. At the same time, the perforation welding method will generate more metal dust, which is likely to cause short circuit of the electrode core. Moreover, this kind of electrode sheet is prone to heat during use, resulting in safety problems of the battery. Summary of the Utility Model

[0004] Based on this, the present application provides an electrode sheet, an electrode core, a battery, a battery pack, and an electrical device to solve the problems of unstable connection of perforation conduction, easy short circuit, and safety problems caused by high temperature rise.

[0005] On the one hand, the present application provides an electrode sheet, including:

[0006] An electrode sheet foil, which includes a base material and two plating layers, and the two plating layers are respectively located on opposite sides of the base material in the thickness direction;

[0007] An electrode tab foil, which includes an upper foil and a lower foil connected to each other, and the upper foil and the lower foil are respectively located on opposite sides of the electrode sheet foil in the thickness direction;

[0008] The upper foil is connected to one of the plating layers, the lower foil is connected to the other plating layer, and the upper foil and the lower foil are connected outside the electrode sheet foil to conduct the plating layers on both sides of the base material.

[0009] In a possible implementation manner, the upper foil has an upper extending part extending out of one side edge of the electrode sheet foil, and the lower foil has a lower extending part extending out of one side edge of the electrode sheet foil;

[0010] The upper extending part and the lower extending part are located on the same side of the electrode sheet foil and are connected to each other.

[0011] In a possible implementation manner, the electrode tab foil further includes an extending foil, and the extending foil is located on the side of the lower foil away from the electrode sheet foil and is welded to the lower foil.

[0012] In a possible implementation manner, the upper foil, the lower foil, and the extending foil are of an integral structure.

[0013] In a possible implementation, the upper foil, the electrode foil, and the lower foil are welded and connected through a weld seam located at the end of the electrode foil.

[0014] In a possible implementation, the distance by which the tab foil extends beyond the electrode foil on the side away from the electrode foil is L, and L satisfies: L ≥ 10 mm.

[0015] In a possible implementation, L satisfies: L ≥ 25 mm.

[0016] In a possible implementation, the width of the weld seam where the upper foil is welded to one of the coatings, and / or the width of the weld seam where the lower foil is welded to the other coating is W, and W satisfies: 2 mm ≤ W ≤ 5 mm.

[0017] On the other hand, the present application provides an electrode core including the above-mentioned electrode.

[0018] On the other hand, the present application provides a battery including a housing and the above-mentioned electrode core, and the electrode core is located in the housing.

[0019] On the other hand, the present application provides a battery pack including the above-mentioned battery.

[0020] On yet another hand, the present application provides an electrical device including the above-mentioned electrode core, or the above-mentioned battery, or the above-mentioned battery pack.

[0021] For the electrode, the electrode core, the battery, the battery pack, and the electrical device provided by the present application, by respectively arranging the upper foil and the lower foil on opposite sides of the electrode foil, and connecting the upper foil, the electrode foil, and the lower foil by welding, the upper foil is electrically connected to the adjacent coating, the lower foil is electrically connected to the adjacent coating, and the upper foil and the lower foil are connected outside the electrode foil, realizing the electrical connection of the coatings on both sides of the base material. Compared with the electrical connection through perforation welding, the electrical connection of the coatings on both sides is realized by welding and connecting the upper foil and the lower foil on opposite sides of the electrode foil, generating less metal debris and having less short-circuit problems. Moreover, through welding connection, the stability is high. For the tab foils on both sides at the electrode tab, the current-carrying area of the tab is increased, the temperature rise during fast charging and discharging is reduced, and the safety of the battery is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is one of the structural schematic diagrams of the electrode provided by the embodiment of the present application;

[0024] Figure 2 is Figure 1 A cross-sectional view of the shown electrode along the A-A direction;

[0025] Figure 3 is Figure 1 A schematic structural view of the shown electrode coil;

[0026] Figure 4 is the second schematic structural view of the electrode provided by the embodiment of the present application;

[0027] Figure 5 is Figure 4 A cross-sectional view of the shown electrode along the B-B direction;

[0028] Figure 6 is Figure 4 A schematic structural view of the shown electrode coil;

[0029] Figure 7 is the third schematic structural view of the electrode provided by the embodiment of the present application;

[0030] Figure 8 is Figure 7 A cross-sectional view of the shown electrode along the C-C direction;

[0031] Figure 9 is Figure 7 A schematic structural view of the shown electrode coil.

[0032] Explanation of reference numerals:

[0033] 100 - electrode; 10 - electrode foil; 11 - base material; 12 - coating; 20 - tab foil; 21 - upper foil; 22 - lower foil; 23 - extended foil; 30 - weld. Detailed implementation manners

[0034] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0037] The terms "first", "second", "third" (if any) in the description, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0038] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or display comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0039] Currently, when a battery is assembled and manufactured, a single-layer light foil is usually welded on one side of the electrode foil as a tab. When the electrode foil is made of PET foil, the method of perforating the welding area is usually adopted to achieve the conduction of the plating metals on both sides of the electrode foil.

[0040] However, this structure of perforated conduction has great uncertainty in processing. At the same time, the method of perforated welding will generate a large amount of metal dust, which is likely to cause a short circuit of the battery cell. Moreover, when this electrode performs the fast charging function in the battery, due to the thin tab, the heat generation is obvious, which easily leads to a rapid increase in temperature, and there are safety problems with the battery.

[0041] After repeated thinking and verification, the inventor found that if light foils are welded on both sides of the electrode foil, and then the conduction between the light foils is used to achieve the conduction of the plating layers on both sides of the substrate. Compared with perforated welding conduction, the conduction of the plating layer through the light foil generates less metal chips and has less short circuit problems. Moreover, through the welded connection of the light foils, the structural stability is high. Welding light foils on both sides of the electrode foil increases the current-carrying area of the tab, reduces the temperature rise during fast charging and discharging, and improves the safety of the battery.

[0042] In view of this, the present application provides a pole piece, including: a pole piece foil, the pole piece foil includes a base material and two plating layers, and the two plating layers are respectively located on opposite sides of the base material in the thickness direction; a tab foil, the tab foil includes an upper foil and a lower foil connected to each other, and the upper foil and the lower foil are respectively located on opposite sides of the pole piece foil in the thickness direction; the upper foil is connected to one of the plating layers, the lower foil is connected to the other plating layer, and the upper foil and the lower foil are connected outside the pole piece foil to conduct the plating layers on both sides of the base material.

[0043] By respectively arranging the upper foil and the lower foil on opposite sides of the pole piece foil, and connecting the upper foil, the pole piece foil and the lower foil by welding, so that the upper foil is conducted with the adjacent plating layer, the lower foil is conducted with the adjacent plating layer, and the upper foil and the lower foil are connected outside the pole piece foil, the conduction of the plating layers on both sides of the base material is realized. Compared with the perforation welding conduction, through the welding connection of the upper foil and the lower foil on opposite sides of the pole piece foil, the conduction of the two plating layers is realized, and less metal chips are generated, and the short-circuit problem is smaller. Moreover, through the welding connection, the stability is high. At the tab of the pole piece, the tab foils on both sides increase the current-carrying area of the tab, reduce the temperature rise during fast charging and discharging, and improve the safety of the battery.

[0044] The content of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present application more clearly and in detail.

[0045] Figure 1 It is one of the structural schematic diagrams of the pole piece provided by the embodiment of the present application. Figure 2 It is Figure 1 The sectional view of the pole piece shown along the A-A direction. Figure 3 It is Figure 1 The structural schematic diagram of the pole piece coil shown. Figure 4 It is the second of the structural schematic diagrams of the pole piece provided by the embodiment of the present application. Figure 5 It is Figure 4 The sectional view of the pole piece shown along the B-B direction. Figure 6 It is Figure 4 The structural schematic diagram of the pole piece coil shown. Figure 7 It is the third of the structural schematic diagrams of the pole piece provided by the embodiment of the present application. Figure 8 It is Figure 7 The sectional view of the pole piece shown along the C-C direction. Figure 9 It is Figure 7 The structural schematic diagram of the pole piece coil shown.

[0046] As Figures 1 to 9As shown, the electrode sheet 100 provided by the embodiment of the present application is used for the assembly and manufacturing of a battery. The electrode sheet 100 includes an electrode sheet foil 10 and an ear foil 20. The electrode sheet foil 10 is welded to the ear foil 20.

[0047] In a possible implementation manner, the electrode sheet foil 10 and the ear foil 20 are welded and connected by an ultrasonic roll welding method.

[0048] Specifically, as Figure 2 、 Figure 5 and Figure 8 shown, in a possible implementation manner, the electrode sheet foil 10 includes a base material 11 and two plating layers 12. The two plating layers 12 are respectively located on opposite sides of the base material 11 in the thickness direction.

[0049] In a possible implementation manner, the electrode sheet foil 10 is a PET foil, the base material 11 is a PET material, and the plating layer 12 is a copper-coated aluminum plating layer.

[0050] The ear foil 20 includes an upper foil 21 and a lower foil 22. The upper foil 21 is connected to the lower foil 22.

[0051] In a possible implementation manner, the ear foil 20 is an aluminum foil, specifically an electronic aluminum foil, that is, a smooth aluminum foil material.

[0052] In another possible implementation manner, the ear foil 20 is a copper foil, specifically a smooth copper foil material.

[0053] The upper foil 21 and the lower foil 22 are respectively located on opposite sides of the electrode sheet foil 10 in the thickness direction. Moreover, the upper foil 21 and the lower foil 22 respectively cover the same side edge of the electrode sheet foil 10, that is, the upper and lower surfaces of one side edge of the electrode sheet foil 10 are respectively provided with the upper foil 21 and the lower foil 22.

[0054] Along the edge of the electrode sheet foil 10, the upper foil 21, the electrode sheet foil 10 and the lower foil 22 are welded and connected, so that the upper foil 21 is welded to one plating layer 12 on the base material 11, the lower foil 22 is welded to the other plating layer 12 on the base material 11, and the plating layers 12 on both sides of the base material 11 are conducted through the connection of the upper foil 21 and the lower foil 22 outside the electrode sheet foil 10. By grafting and welding the upper foil 21 and the lower foil 22 on both sides at the ear position of the electrode sheet foil 10, the current-carrying area of the ear can be increased, the temperature rise during fast charging and discharging can be reduced, and the safety of the battery is improved.

[0055] Specifically, in a possible implementation manner, as Figure 1 and Figure 2As shown, the tab foil 20 further includes an extended foil 23. The extended foil 23 is located on the side of the lower foil 22 away from the tab foil 10, and is welded to the lower foil 22. The extended foil 23 extends outward from the edge of the tab foil 10 from the side where the tab foil 10 is welded to the tab foil 20.

[0056] In a possible implementation, the tab foil 20 is a single-layer foil, that is, the upper foil 21, the lower foil 22, and the extended foil 23 are an integral structure and are connected in sequence. The upper foil 21 and the lower foil 22 in the tab foil 20 wrap one side edge of the tab foil 10 by bending, so that the upper foil 21 and the lower foil 22 are located on opposite sides of the tab foil 10. The lower foil 22 and the extended foil 23 are located on one side of the tab foil 10 by bending, and the side of the extended foil 23 away from the lower foil 22 extends outward from the edge of the tab foil 10.

[0057] Along the edge of the tab foil 10, the upper foil 21, the tab foil 10, the lower foil 22, and the extended foil 23 are welded together. Thus, the upper foil 21 is welded to one plating layer 12 on the base material 11, the lower foil 22 is welded to another plating layer 12 on the base material 11, and the plating layers 12 on both sides of the base material 11 are electrically connected through the integral upper foil 21 and lower foil 22. The extended foil 23 extends away from the tab foil 10, facilitating subsequent welding process. The plating layers 12 on both sides of the base material 11 are electrically connected to the outside through the extended foil 23 integrated with the upper foil 21 and the lower foil 22.

[0058] In a possible implementation, as Figure 4 and Figure 5 shown, the tab foil 20 is a single-layer foil, that is, the upper foil 21 and the lower foil 22 are an integral structure and are connected to each other. The tab foil 20 wraps one side edge of the tab foil 10 by bending, forming the upper foil 21 and the lower foil 22 located on opposite sides of the tab foil 10. That is, the upper foil 21 has an upper extension portion extending out from one side edge of the tab foil 10, the lower foil 22 has a lower extension portion extending out from one side edge of the tab foil 10, the upper extension portion and the lower extension portion are located on the same side of the tab foil, and are connected to each other.

[0059] Along the edge of the pole piece foil 10, the upper layer foil 21, the pole piece foil 10 and the lower layer foil 22 are welded and connected, so that the upper layer foil 21 is welded and connected to a coating 12 on the base material 11, and the lower layer foil 22 is welded and connected to another coating 12 on the base material 11. Through the integrated upper layer foil 21 and the lower layer foil 22, the coatings 12 on both sides of the base material 11 are electrically connected. The upper layer foil 21 and the lower layer foil 22 extend out of one side of the edge of the pole piece foil 10 for subsequent welding process, so that the coatings 12 on both sides of the base material 11 are electrically connected to the outside.

[0060] In a possible implementation, as Figure 7 and Figure 8 shown, the tab foil 20 is composed of two layers of foil, that is, the upper layer foil 21 and the lower layer foil 22 are not directly connected. The upper layer foil 21 and the lower layer foil 22 are connected by a welded seam 30.

[0061] Specifically, the welded seam 30 where the upper layer foil 21, the pole piece foil 10 and the lower layer foil 22 are welded is located at the end of the pole piece foil 10, that is, a stitch welding structure is adopted.

[0062] A part of the area of the welded seam 30 is a two-layer structure that welds the upper layer foil 21 and the lower layer foil 22, and another part is a three-layer structure that welds the upper layer foil 21, the pole piece foil 10 and the lower layer foil 22.

[0063] Along the end of the edge of the pole piece foil 10, the upper layer foil 21, the pole piece foil 10 and the lower layer foil 22 are welded and connected, so that the upper layer foil 21 is welded and connected to a coating 12 on the base material 11, and the lower layer foil 22 is welded and connected to another coating 12 on the base material 11. Through the upper layer foil 21 and the lower layer foil 22 connected by the welded seam 30, the coatings 12 on both sides of the base material 11 are electrically connected. The upper layer foil 21 or the lower layer foil 22 extends out of one side of the edge of the pole piece foil 10 for subsequent welding process, so that the coatings 12 on both sides of the base material 11 are electrically connected to the outside.

[0064] It can be understood that in other embodiments, the tab foil 20 can also be formed into a four-layer, five-layer or more-layer structure by bending. Two of them wrap the edge on one side of the pole piece foil 10, and then the remaining layers are bent respectively, and the outermost one or two layers extend away from the pole piece foil 10 to facilitate subsequent welding process. The multi-layer structure design of the tab foil 20 can increase the current-carrying area of the tab, thereby reducing the temperature rise during fast charging and discharging in the battery and improving the safety of the battery.

[0065] In a possible implementation, the distance that the tab foil 20 extends beyond the pole piece foil 10 on the side away from the pole piece foil 10 is L, and L satisfies: L≥10mm.

[0066] The dimension by which the tab foil 20 extends from the tabless foil 10 is for the purpose of facilitating subsequent processing and use. In the embodiments of the present application, the reserved dimension of the tab foil 20 is for welding the tab lead-out piece in the next process, preventing the welding process from affecting the PET material in the tabless foil 10.

[0067] As Figure 1 and Figure 2 shown, in a possible implementation, L is the distance between the end of the extended foil 23 on the side away from the tabless foil 10 and the end of the side of the tabless foil 10 where the tab foil 20 is welded.

[0068] As Figure 4 and Figure 5 shown, in a possible implementation, L is the distance between the bent connection part of the upper foil 21 and the lower foil 22 and the end of the side of the tabless foil 10 where the tab foil 20 is welded.

[0069] As Figure 7 and Figure 8 shown, in a possible implementation, L is the distance between the end of the lower foil 22 on the side away from the tabless foil 10 and the end of the side of the tabless foil 10 where the tab foil 20 is welded.

[0070] Optionally, L satisfies: L≥25mm.

[0071] Specifically, the width of the weld 30 where the tabless foil 10 is welded to the tab foil 20 is W, that is, the width of the weld 30 where the upper foil 21 is welded to one of the coatings 12, and / or the width of the weld 30 where the lower foil 22 is welded to the other coating 12. W satisfies: 2mm≤W≤5mm.

[0072] When the width of the weld 30 is less than 2mm, the welding size is small, and the connection between the tabless foil 10 and the tab foil 20 is unstable; when the width of the weld 30 is greater than 5mm, the welding size is too large, which is likely to cause waste of the tabless foil 10 and also affect the battery volume. The size of the weld 30 where the tabless foil 10 is welded to the tab foil 20 is for the purpose of stably connecting the tabless foil 10 and the tab foil 20, preventing separation during subsequent processing and use, resulting in process problems, yield problems, and safety problems, etc.

[0073] As Figures 1 to 5 shown, in a possible implementation, the weld 30 is located at the edge of the tabless foil 10 on one side, and the weld 30 penetrates the foil, welding and connecting the upper foil 21, the tabless foil 10, the lower foil 22, and the extended foil 23, or welding and connecting the upper foil 21, the tabless foil 10, and the lower foil 22. Among them, the weld 30 does not penetrate the tabless foil 10, but only welds and connects the adjacent foils, as Figure 2Among them, the upper foil 21 is welded to one of the coatings 12 of the electrode foil 10, the other coating 12 of the electrode foil 10 is welded to the lower foil 22, and the lower foil 22 is welded to the extension foil 23; as Figure 5 Among them, the upper foil 21 is welded to one of the coatings 12 of the electrode foil 10, and the other coating 12 of the electrode foil 10 is welded to the lower foil 22.

[0074] As Figure 7 and Figure 8 shown, in a possible implementation, the weld 30 is located at the end on the side of the electrode foil 10. The weld 30 penetrates through the upper foil 21 and the lower foil 22, welds the upper foil 21 and the lower foil 22 together, and welds the end of the electrode foil 10 in the middle.

[0075] The electrode tab 100 provided by the embodiment of the present application includes an electrode foil 10 and an electrode tab foil 20. The electrode foil 10 includes a base material 11 and two coatings 12, and the two coatings 12 are respectively located on opposite sides in the thickness direction of the base material 11; the electrode tab foil 20 includes an upper foil 21 and a lower foil 22 connected to each other, and the upper foil 21 and the lower foil 22 are respectively located on opposite sides in the thickness direction of the electrode foil 10; the upper foil 21 is connected to one of the coatings 12, the lower foil 22 is connected to the other coating 12, and the upper foil 21 and the lower foil 22 are connected outside the electrode foil 10 to conduct the coatings 12 on both sides of the base material 11.

[0076] By respectively arranging the upper foil 21 and the lower foil 22 on opposite sides of the electrode foil 10, and connecting the upper foil 21, the electrode foil 10 and the lower foil 22 by welding, the upper foil is conducted with the adjacent coating, the lower foil is conducted with the adjacent coating, and the upper foil and the lower foil are connected outside the electrode foil, so as to realize the conduction of the coatings 12 on both sides of the base material 11. Compared with the perforation welding conduction, through the welding connection of the upper foil 21 and the lower foil 22 on opposite sides of the electrode foil 10, the conduction of the coatings 12 on both sides is realized, with less metal chips generated and less short-circuit problems. Moreover, through the welding connection, the stability is high. For the electrode tab foils 20 on both sides at the electrode tab of the electrode, the current-carrying area of the electrode tab is increased, the temperature rise during fast charging and discharging is reduced, and the safety of the battery is improved. Furthermore, the connection structure of the present application is diverse and can be selected according to different requirements, with the characteristics of strong industrialization and manufacturability.

[0077] In addition, as Figure 3 , Figure 6 and Figure 9 shown, the embodiment of the present application also provides a method for manufacturing a coil of the electrode tab 100. Specifically, it includes:

[0078] The first step: manufacture a coil of the electrode foil 10 and a coil of the electrode tab foil 20.

[0079] Step 2: Welding work. After the coils of the pole piece foil 10 and the tab foil 20 are unwound respectively, they are combined and welded to form a 2-3 layer tab foil 20 grafted on the pole piece foil 10 coil.

[0080] The specific welding structure is as Figure 1 , Figure 4 and Figure 7 shown.

[0081] Step 3: After welding, the welded pole piece foil 10 is wound up to form a coil of the pole piece 100.

[0082] In addition, an embodiment of the present application also provides an electric core, including the above-mentioned pole piece 100.

[0083] Among them, the specific structure, working principle and function of the pole piece 100 have been described in detail in the foregoing embodiments, and will not be elaborated herein.

[0084] The pole piece 100 can form an electric core by winding or stacking, that is, the electric core can be a wound core or a laminated electric core made of the pole piece 100.

[0085] In addition, an embodiment of the present application also provides a battery, including a housing and the above-mentioned electric core, and the electric core is located in the housing.

[0086] An embodiment of the present application also provides a battery pack, including the above-mentioned battery.

[0087] An embodiment of the present application also provides an electrical device, including an electrical device and the electric core, battery, or battery pack described in any of the above embodiments, and the electric core, battery, or battery pack is used to provide electrical energy for the electrical device.

[0088] The electrical device in the embodiment of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0089] In addition, the electrical device can also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecrafts, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles or spaceships.

[0090] In view that the electrical device in this embodiment includes the electric core, battery or battery pack described in any of the above embodiments, therefore, the electrical device includes the structures and beneficial effects of the electric core, battery or battery pack, and will not be elaborated herein.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole piece, characterized in that: include: A pole piece foil (10), the pole piece foil (10) comprising a substrate (11) and two coating layers (12), the two coating layers (12) being respectively located on two opposite sides of the substrate (11) in a thickness direction; A tab foil (20), the tab foil (20) comprising an upper foil (21) and a lower foil (22) connected to each other, the upper foil (21) and the lower foil (22) being located at opposite sides of the pole piece foil (10) in a thickness direction; The upper foil (21) is connected to one of the coating layers (12), the lower foil (22) is connected to the other coating layer (12), and the upper foil (21) and the lower foil (22) are connected outside the electrode foil (10) to conduct the coating layers (12) on both sides of the substrate (11).

2. The pole piece according to claim 1, characterized in that: The upper foil (21) has an upper extension portion extending from one side edge of the pole piece foil (10), and the lower foil (22) has a lower extension portion extending from one side edge of the pole piece foil (10); The upper layer extension portion and the lower layer extension portion are located on the same side of the pole piece foil and are connected to each other.

3. The pole piece according to claim 1, characterized in that: The tab foil (20) further comprises an extended foil (23), wherein the extended foil (23) is located on a side of the lower foil (22) away from the pole piece foil (10) and is welded to the lower foil (22).

4. The pole piece according to claim 3, characterized in that: The upper foil material (21), the lower foil material (22) and the extended foil material (23) are an integrated structure.

5. The pole piece according to claim 1, characterized in that: The upper foil (21), the pole piece foil (10) and the lower foil (22) are connected by welding via a welding seam (30) located at the end of the pole piece foil (10).

6. The pole piece according to any one of claims 1 to 5, characterized in that: The distance L that the side of the pole tab foil (20) away from the pole piece foil (10) exceeds the pole piece foil (10) is, and L satisfies: L≥10 mm.

7. The pole piece according to claim 6, characterized in that: L satisfies: L≥25mm.

8. The pole piece according to any one of claims 1 to 5, characterized in that: The width of the weld (30) between the upper foil (21) and one of the coatings (12), and / or the width of the weld (30) between the lower foil (22) and another coating (12) is W, and W satisfies: 2mm≤W≤5mm.

9. A battery cell, characterized in that: It comprises a pole piece (100) as claimed in any one of claims 1 to 8.

10. A battery, characterized in that: The invention comprises a shell and the battery cell as claimed in claim 9, wherein the battery cell is located in the shell.

11. A battery pack, characterized in that: Comprising the battery as claimed in claim 10.

12. An electrical equipment, characterized in that: It comprises the battery cell as claimed in claim 9, or the battery as claimed in claim 10, or the battery pack as claimed in claim 11.

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