Electrode sheet, battery cell, battery, battery pack and electric apparatus

Abstract

An electrode sheet, a battery cell, a battery, a battery pack and an electric apparatus. The electrode sheet comprises an electrode sheet foil and a tab foil, wherein the electrode sheet foil comprises a substrate and two plated layers, the two plated layers being respectively located on opposite sides of the substrate; the tab foil comprises an upper-layer foil and a lower-layer foil connected to each other; the upper-layer foil is connected to one of the plated layers, and the lower-layer foil is connected to the other plated layer; and the upper-layer foil and the lower-layer foil are connected to each other outside the electrode sheet foil, so as to electrically connect the plated layers on the two sides of the substrate.

Description

Electrode sheets, cells, batteries, battery packs and electrical equipment

[0001] This disclosure claims priority to Chinese Patent Application No. 202421715606.9, filed on July 18, 2024, entitled “Electrode, Cell, Battery, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of battery assembly and manufacturing technology, and in particular to an electrode, a cell, a battery, a battery pack, and an electrical device. Background Technology

[0003] Currently, during battery assembly and manufacturing, a single layer of light foil is typically welded to one side of the electrode foil to serve as the tab. When PET foil is used as the electrode foil, perforations are usually made in the welding area to achieve electrical conductivity between the metal plating on both sides of the electrode foil.

[0004] However, this perforated conductive structure results in unstable connections during manufacturing, leading to significant uncertainty in conductivity. Furthermore, the perforated welding method generates substantial amounts of metal dust, which can easily cause short circuits in the battery cell. Additionally, these electrodes are prone to overheating during use, posing a safety risk to the battery. Summary of the Invention

[0005] Based on this, the present disclosure provides an electrode sheet, a cell, a battery, a battery pack, and an electrical device to solve the problems of unstable through-hole conductive connection, which can easily cause short circuits, and safety issues caused by high temperature rise.

[0006] On the one hand, this disclosure provides an electrode sheet, comprising:

[0007] Electrode foil material, comprising a substrate and two coatings, the two coatings being located on opposite sides of the substrate in the thickness direction;

[0008] The electrode foil material includes an upper foil and a lower foil that are connected to each other, and the upper foil and the lower foil are located on opposite sides of the electrode foil in the thickness direction.

[0009] The upper foil is connected to one of the coatings, and the lower foil is connected to the other coating. The upper foil and the lower foil are connected on the outside of the electrode foil to conduct the coatings on both sides of the substrate.

[0010] In one possible implementation, the upper foil has an upper protrusion extending beyond one edge of the electrode foil, and the lower foil has a lower protrusion extending beyond one edge of the electrode foil.

[0011] The upper and lower protrusions are located on the same side of the electrode foil and are connected to each other.

[0012] In one possible implementation, the tab foil also includes an extension foil located on the side of the lower foil away from the electrode foil and welded to the lower foil.

[0013] In one possible implementation, the upper foil, the lower foil, and the extended foil are integrated into a single structure.

[0014] In one possible implementation, the upper foil, the electrode foil, and the lower foil are welded together by a weld located at the end of the electrode foil.

[0015] In one possible implementation, the distance L is the distance from the electrode foil to the electrode foil on the side away from the electrode foil, where L satisfies: L≥10mm.

[0016] In one possible implementation, L satisfies: L≥25mm.

[0017] In one possible implementation, the width of the weld between the upper foil and one of the coatings, and / or the width of the weld between the lower foil and another coating, is W, where W satisfies: 2mm ≤ W ≤ 5mm.

[0018] On the other hand, this disclosure provides a battery cell including the aforementioned electrode sheets.

[0019] On the other hand, this disclosure provides a battery including a housing and the aforementioned battery cell, the battery cell being located within the housing.

[0020] On the other hand, this disclosure provides a battery pack including the battery described above.

[0021] In another aspect, this disclosure provides an electrical device, including the aforementioned battery cell, or the aforementioned battery, or the aforementioned battery pack.

[0022] The electrode sheets, cells, batteries, battery packs, and electrical devices disclosed herein utilize an upper foil and a lower foil on opposite sides of the electrode foil, connected by welding. This allows the upper foil to conduct with adjacent plating layers, and the lower foil to conduct with adjacent plating layers. The upper and lower foils are connected on the outside of the electrode foil, achieving conductivity between the plating layers on both sides of the substrate. Compared to through-hole welding, this welding connection between the upper and lower foils on opposite sides of the electrode foil results in less metal debris and a lower risk of short circuits. Furthermore, the welding connection provides high stability. The tab foil on both sides of the electrode tab increases the current-carrying area, reducing temperature rise during fast charging and discharging and improving battery safety. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of one of the electrode structures provided in the embodiments of this disclosure;

[0025] Figure 2 is a cross-sectional view of the electrode shown in Figure 1 along the AA direction;

[0026] Figure 3 is a schematic diagram of the structure of the electrode roll shown in Figure 1;

[0027] Figure 4 is a second schematic diagram of the structure of the electrode sheet provided in the embodiment of this disclosure;

[0028] Figure 5 is a cross-sectional view of the electrode shown in Figure 4 along the BB direction;

[0029] Figure 6 is a schematic diagram of the structure of the electrode roll shown in Figure 4;

[0030] Figure 7 is a third schematic diagram of the structure of the electrode sheet provided in the embodiment of this disclosure;

[0031] Figure 8 is a cross-sectional view of the electrode shown in Figure 7 along the CC direction;

[0032] Figure 9 is a schematic diagram of the structure of the electrode roll shown in Figure 7;

[0033] Figure 10 is a schematic diagram of a battery provided in an embodiment of this application;

[0034] Figure 11 is a schematic diagram of a battery pack provided in an embodiment of this application;

[0035] Figure 12 is a schematic diagram of an electrical device provided in an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 100-Electrode sheet; 10-Electrode foil; 11-Substrate; 12-Coating; 20-Taper foil; 21-Upper foil; 211-Upper extension; 212-Lower extension; 22-Lower foil; 23-Extended foil; 30-Weld; 200-Cell; 300-Battery; 301-Casing; 400-Battery pack; 500-Electrical equipment. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions in the embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this disclosure. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure. The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0038] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection via an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0039] In the description of this disclosure, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0040] The terms “first,” “second,” and “third” (if any) in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

[0041] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0042] Currently, during battery assembly and manufacturing, a single layer of light foil is typically welded to one side of the electrode foil to serve as the tab. When PET foil is used as the electrode foil, perforations are usually made in the welding area to achieve conductivity between the metal plating on both sides of the electrode foil.

[0043] However, this perforated conductive structure presents significant uncertainties in manufacturing, and the perforated welding method generates substantial amounts of metal dust, which can easily cause short circuits in the battery cell. Furthermore, when this type of electrode is used in the battery for fast charging, the thin tabs generate significant heat, potentially leading to a rapid temperature rise and posing a safety risk.

[0044] After repeated consideration and verification, the inventors discovered that if optical foil is welded to both sides of the electrode foil, and the conductivity between the optical foils is used to achieve conductivity between the coatings on both sides of the substrate, compared to through-hole welding, achieving conductivity through optical foil results in less metal shavings and fewer short-circuit problems. Furthermore, the optical foil welding connection provides high structural stability. Welding optical foil to both sides of the electrode foil increases the current-carrying area of ​​the tabs, reducing temperature rise during fast charging and discharging, and improving battery safety.

[0045] In view of the above, this disclosure provides an electrode sheet, comprising: an electrode foil, the electrode foil including a substrate and two plating layers, the two plating layers being located on opposite sides of the substrate in the thickness direction; an electrode tab foil, the electrode tab foil including an upper foil and a lower foil connected to each other, the upper foil and the lower foil being located on opposite sides of the electrode foil in the thickness direction; the upper foil being connected to one of the plating layers, the lower foil being connected to the other plating layer, the upper foil and the lower foil being connected on the outside of the electrode foil to conduct the plating layers on both sides of the substrate.

[0046] By setting upper and lower foils on opposite sides of the electrode foil and connecting them by welding, the upper foil and the electrode foil are made conductive with the adjacent plating layer, and the lower foil is also conductive with the adjacent plating layer. The upper and lower foils are connected on the outside of the electrode foil, achieving conductivity between the plating layers on both sides of the substrate. Compared to through-hole welding, the welding connection of the upper and lower foils on opposite sides of the electrode foil achieves conductivity between the plating layers on both sides, generating less metal debris and reducing the risk of short circuits. Furthermore, the welding connection provides high stability, and the tab foils on both sides of the electrode tab increase the current-carrying area of ​​the tab, reducing the temperature rise during fast charging and discharging and improving battery safety.

[0047] The contents of this disclosure will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this disclosure.

[0048] Figure 1 is one of the structural schematic diagrams of the electrode sheet provided in the embodiments of this disclosure. Figure 2 is a cross-sectional view of the electrode sheet shown in Figure 1 along the AA direction. Figure 3 is a structural schematic diagram of the electrode sheet roll shown in Figure 1. Figure 4 is another structural schematic diagram of the electrode sheet provided in the embodiments of this disclosure. Figure 5 is a cross-sectional view of the electrode sheet shown in Figure 4 along the BB direction. Figure 6 is a structural schematic diagram of the electrode sheet roll shown in Figure 4. Figure 7 is a third structural schematic diagram of the electrode sheet provided in the embodiments of this disclosure. Figure 8 is a cross-sectional view of the electrode sheet shown in Figure 7 along the CC direction. Figure 9 is a structural schematic diagram of the electrode sheet roll shown in Figure 7.

[0049] As shown in Figures 1 to 9, the electrode 100 provided in this embodiment is used for battery assembly and manufacturing. The electrode 100 includes an electrode foil 10 and a tab foil 20. The electrode foil 10 and the tab foil 20 are welded together.

[0050] In one possible implementation, the electrode foil 10 and the tab foil 20 are welded together by ultrasonic roll welding.

[0051] Specifically, as shown in Figures 2, 5, and 8, in one possible implementation, the electrode foil 10 includes a substrate 11 and two plating layers 12. The two plating layers 12 are located on opposite sides of the substrate 11 in the thickness direction.

[0052] In one possible implementation, the electrode foil 10 is a PET foil, the substrate 11 is a PET material, and the coating 12 is a copper-aluminum coating.

[0053] The tab foil 20 includes an upper foil 21 and a lower foil 22. The upper foil 21 and the lower foil 22 are interconnected.

[0054] In one possible implementation, the tab foil 20 is aluminum foil, specifically electronic aluminum foil, i.e., smooth aluminum foil material.

[0055] In another possible implementation, the tab foil 20 is a copper foil, specifically a smooth copper foil material.

[0056] The upper foil 21 and the lower foil 22 are located on opposite sides of the electrode foil 10 in the thickness direction. Furthermore, the upper foil 21 and the lower foil 22 respectively cover the same edge of the electrode foil 10, that is, the upper foil 21 and the lower foil 22 are respectively provided on the upper and lower surfaces of one edge of the electrode foil 10.

[0057] Along the edge of the electrode foil 10, the upper foil 21, the electrode foil 10, and the lower foil 22 are welded together, thereby welding the upper foil 21 to one plating layer 12 on the substrate 11 and welding the lower foil 22 to another plating layer 12 on the substrate 11. The upper foil 21 and the lower foil 22 are connected on the outside of the electrode foil 10, making the plating layers 12 on both sides of the substrate 11 conductive. By grafting and welding the upper foil 21 and the lower foil 22 onto both sides of the electrode tab position on the electrode foil 10, the current-carrying area of ​​the tab can be increased, reducing the temperature rise during fast charging and discharging, and improving battery safety.

[0058] Specifically, in one possible implementation, as shown in Figures 1 and 2, the tab foil 20 further includes an extension foil 23. The extension foil 23 is located on the side of the lower foil 22 away from the electrode foil 10 and is welded to the lower foil 22. The extension foil 23 extends outward from the edge of the electrode foil 10 from the side where the electrode foil 10 is welded to the tab foil 20.

[0059] In one possible implementation, the tab foil 20 is a single layer of foil, namely, the upper foil 21, the lower foil 22, and the extension foil 23 are integrally structured and connected sequentially. The upper foil 21 and the lower foil 22 of the tab foil 20 are bent to cover one edge of the electrode foil 10, so that the upper foil 21 and the lower foil 22 are located on opposite sides of the electrode foil 10. The lower foil 22 and the extension foil 23 are bent to one side of the electrode foil 10, with the side of the extension foil 23 away from the lower foil 22 extending outwards from the edge of the electrode foil 10.

[0060] Along the edge of the electrode foil 10, the upper foil 21, the electrode foil 10, the lower foil 22, and the extension foil 23 are welded together. This allows the upper foil 21 to be welded to one plating layer 12 on the substrate 11, and the lower foil 22 to be welded to another plating layer 12 on the substrate 11. The integral upper foil 21 and lower foil 22 connect the plating layers 12 on both sides of the substrate 11. The extension foil 23 extends away from the electrode foil 10, facilitating subsequent welding processes. The plating layers 12 on both sides of the substrate 11 are connected to the outside environment through the extension foil 23, which is integral with the upper foil 21 and lower foil 22.

[0061] In one possible implementation, as shown in Figures 4 and 5, the tab foil 20 is a single layer of foil, meaning the upper foil 21 and the lower foil 22 are an integral structure connected to each other. The tab foil 20 is bent to cover one edge of the electrode foil 10, forming the upper foil 21 and the lower foil 22 located on opposite sides of the electrode foil 10. Specifically, the upper foil 21 has an upper protrusion 211 extending beyond one edge of the electrode foil 10, and the lower foil 22 has a lower protrusion 212 extending beyond one edge of the electrode foil 10. The upper protrusion 211 and the lower protrusion 212 are located on the same side of the electrode foil 10 and are connected to each other.

[0062] Along the edge of the electrode foil 10, the upper foil 21, the electrode foil 10, and the lower foil 22 are welded together, thereby welding the upper foil 21 to one plating layer 12 on the substrate 11 and welding the lower foil 22 to another plating layer 12 on the substrate 11. The integrated upper foil 21 and lower foil 22 connect the plating layers 12 on both sides of the substrate 11. The upper foil 21 and lower foil 22 extend beyond one side of the edge of the electrode foil 10 for subsequent welding processes, thereby making the plating layers 12 on both sides of the substrate 11 connected to the outside.

[0063] In one possible implementation, as shown in Figures 7 and 8, the tab foil 20 consists of two layers, namely, the upper foil 21 and the lower foil 22 are not directly connected. The upper foil 21 and the lower foil 22 are connected by a weld 30.

[0064] Specifically, the weld 30, which connects the upper foil 21, the electrode foil 10, and the lower foil 22, is located at the end of the electrode foil 10, i.e., it adopts a saddle-welding structure.

[0065] A portion of the weld seam 30 has a two-layer structure, where the upper foil 21 and the lower foil 22 are welded together. Another portion has a three-layer structure, where the upper foil 21, the electrode foil 10, and the lower foil 22 are welded together.

[0066] Along the edge of the electrode foil 10, the upper foil 21, the electrode foil 10, and the lower foil 22 are welded together, thereby welding the upper foil 21 to one plating layer 12 on the substrate 11 and welding the lower foil 22 to another plating layer 12 on the substrate 11. The upper foil 21 and the lower foil 22 are connected by a weld 30, which also connects the plating layers 12 on both sides of the substrate 11. The upper foil 21 or the lower foil 22 extends beyond one side of the edge of the electrode foil 10 for subsequent welding processes, thereby making the plating layers 12 on both sides of the substrate 11 connected to the outside.

[0067] Understandably, in other embodiments, the tab foil 20 can also be bent to form a four-, five-, or more-layered structure. Two of these layers cover one edge of the electrode foil 10, and then the remaining layers are bent, with the outermost one or two layers extending away from the electrode foil 10 to facilitate subsequent welding processes. This multi-layered structure of the tab foil 20 increases the current-carrying area of ​​the tabs, thereby reducing temperature rise during fast charging and discharging in the battery and improving battery safety.

[0068] In one possible implementation, the distance L on the side of the tab foil 20 that is away from the electrode foil 10 extends beyond the electrode foil 10, where L satisfies: L≥10mm.

[0069] The tab foil 20 extends beyond the size of the electrode foil 10 to facilitate subsequent processing. In the embodiments of this disclosure, the reserved size of the tab foil 20 is for the welding of the tab lead sheet in the next process, to prevent the welding process from affecting the PET material in the electrode foil 10.

[0070] As shown in Figures 1 and 2, in one possible implementation, L is the distance between the end of the extended foil 23 away from the electrode foil 10 and the end of the electrode foil 10 on the side where the tab foil 20 is welded.

[0071] As shown in Figures 4 and 5, in one possible implementation, L is the distance between the bent connection portion of the upper foil 21 and the lower foil 22 and the end of the electrode foil 10 on the side where the tab foil 20 is welded.

[0072] As shown in Figures 7 and 8, in one possible implementation, L is the distance between the end of the lower foil 22 away from the electrode foil 10 and the end of the electrode foil 10 on the side where the tab foil 20 is welded.

[0073] Optional, L must satisfy: L≥25mm.

[0074] Specifically, the width of the weld 30 between the electrode foil 10 and the tab foil 20 is W, which is the width of the weld 30 between the upper foil 21 and one of the plating layers 12, and / or the width of the weld 30 between the lower foil 22 and another plating layer 12. W satisfies: 2mm ≤ W ≤ 5mm.

[0075] When the width of weld 30 is less than 2mm, the weld size is too small, and the connection between electrode foil 10 and tab foil 20 is unstable. When the width of weld 30 is greater than 5mm, the weld size is too large, which can easily lead to waste of electrode foil 10 and affect the battery volume. The size of weld 30 between electrode foil 10 and tab foil 20 is intended to ensure a stable connection between them, preventing separation during subsequent processing and use, which could cause process problems, yield problems, and safety issues.

[0076] As shown in Figures 1 to 5, in one possible implementation, the weld 30 is located at the edge of one side of the electrode foil 10. The weld 30 penetrates the foil and welds the upper foil 21, the electrode foil 10, the lower foil 22, and the extension foil 23 together, or welds the upper foil 21, the electrode foil 10, and the lower foil 22 together. In this implementation, the weld 30 does not penetrate the electrode foil 10; it only welds adjacent foils together. For example, in Figure 2, the upper foil 21 is welded to one of the plating layers 12 of the electrode foil 10, the other plating layer 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; in Figure 5, the upper foil 21 is welded to one of the plating layers 12 of the electrode foil 10, and the other plating layer 12 of the electrode foil 10 is welded to the lower foil 22.

[0077] As shown in Figures 7 and 8, in one possible implementation, the weld 30 is located at the end of one side of the electrode foil 10. The weld 30 penetrates the upper foil 21 and the lower foil 22, welding the upper foil 21 and the lower foil 22 together, and welding the end of the electrode foil 10 in the middle.

[0078] The electrode 100 provided in this embodiment includes an electrode foil 10 and an electrode tab foil 20. The electrode foil 10 includes a substrate 11 and two plating layers 12, which are located on opposite sides of the substrate 11 in the thickness direction. The electrode tab foil 20 includes an upper foil 21 and a lower foil 22 connected to each other, which are located on opposite sides of the electrode foil 10 in the thickness direction. The upper foil 21 is connected to one of the plating layers 12, and the lower foil 22 is connected to the other plating layer 12. The upper foil 21 and the lower foil 22 are connected on the outside of the electrode foil 10 to conduct the plating layers 12 on both sides of the substrate 11.

[0079] By setting an upper foil 21 and a lower foil 22 on opposite sides of the electrode foil 10, and connecting the upper foil 21, electrode foil 10, and lower foil 22 by welding, the upper foil is made conductive with the adjacent plating layer, and the lower foil is also conductive with the adjacent plating layer. The upper and lower foils are connected on the outside of the electrode foil, achieving conductivity of the plating layers 12 on both sides of the substrate 11. Compared with through-hole welding, the welding connection of the upper foil 21 and lower foil 22 on opposite sides of the electrode foil 10 to achieve conductivity of the plating layers 12 on both sides generates less metal shavings and reduces the risk of short circuits. Furthermore, the welding connection provides high stability. The tab foil 20 on both sides of the electrode tab increases the current flow area of ​​the tab, reducing the temperature rise during fast charging and discharging and improving battery safety. Moreover, the connection structure disclosed herein is diverse and can be selected according to different needs, possessing the characteristics of industrialization and strong manufacturability.

[0080] Furthermore, as shown in Figures 3, 6, and 9, this disclosure also provides a method for manufacturing a roll of electrode sheet 100. Specifically, it includes:

[0081] Step 1: Produce 10 rolls of electrode foil and 20 rolls of electrode tab foil.

[0082] Step 2: Welding. After unwinding the 10 rolls of electrode foil and the 20 rolls of electrode tab foil, they are combined and welded to form 2-3 layers of electrode tab foil 20 grafted onto the 10 rolls of electrode foil.

[0083] The specific welding structure is shown in Figures 1, 4 and 7.

[0084] Step 3: After welding is completed, the welded electrode foil 10 is rolled up to form a roll of electrode 100.

[0085] In addition, this disclosure also provides a battery cell 200, including the aforementioned electrode 100.

[0086] The specific structure, working principle and function of the electrode 100 have been described in detail in the foregoing embodiments, and will not be repeated here.

[0087] The electrode 100 can be formed into a cell 200 by winding or stacking, that is, the cell 200 can be a wound core or a stacked cell 200 made by the electrode 100.

[0088] As shown in Figure 10, this embodiment of the present disclosure also provides a battery 300, including a housing 301 and the aforementioned battery cell 200, wherein the battery cell 200 is located in the housing 301.

[0089] As shown in Figure 11, this embodiment of the present disclosure also provides a battery pack 400, which includes the battery 300 described above.

[0090] As shown in Figure 12, this embodiment of the present disclosure also provides an electrical device 500, including an electrical device and a battery cell 200, a battery 300, or a battery pack 400 as described in any of the above embodiments. The battery cell 200, the battery 300, or the battery pack 400 are used to provide electrical energy to the electrical device.

[0091] In this embodiment, the electrical device 500 can be a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Accordingly, the electrical device can be the vehicle's drive mechanism or the vehicle's control system.

[0092] In addition, electrical equipment 500 can also be other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships and spacecraft, among which spacecraft can include airplanes, rockets, space shuttles or spacecraft.

[0093] Given that the electrical device 500 in this embodiment includes the battery cell 200, battery 300 or battery pack 400 described in any of the above embodiments, the structure and beneficial effects of the electrical device 500 including the battery cell 200, battery 300 or battery pack 400 will not be described in detail here.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A pole piece (100), characterized in that, The application relates to a polar piece foil (10) and a polar lug foil (20). The polar piece foil (10) comprises a base material (11) and two plating layers (12) located on opposite sides of the base material (11) in the thickness direction. The polar lug foil (20) comprises an upper foil (21) and a lower foil (22) connected to each other, and the upper foil (21) and the lower foil (22) are located on opposite sides of the polar piece foil (10) in the thickness direction. The upper foil (21) is connected to one of the plating layers (12), the lower foil (22) is connected to the other plating layer (12), and the upper foil (21) and the lower foil (22) are connected outside the polar piece foil (10) to connect the two plating layers (12) on the two sides of the base material (11).

2. The pole piece (100) according to claim 1, characterized in that The upper foil (21) has an upper extension (211) extending out of one side edge of the polar piece foil (10), and the lower foil (22) has a lower extension (212) extending out of one side edge of the polar piece foil (10). The upper extension (211) and the lower extension (212) are located on the same side of the polar piece foil (10) and are connected to each other.

3. The pole piece (100) according to claim 1 or 2, characterized in that The polar lug foil (20) further comprises an extension foil (23) located on the side of the lower foil (22) away from the polar piece foil (10) and welded to the lower foil (22).

4. The pole piece (100) according to claim 3, characterized in that The upper foil (21), the lower foil (22) and the extension foil (23) are in an integrated structure.

5. The pole piece (100) according to any one of claims 1-4, characterized in that The upper foil (21), the polar piece foil (10) and the lower foil (22) are welded by a welding seam (30) located at the end of the polar piece foil (10).

6. The pole piece (100) according to any one of claims 1-5, characterized in that The distance between the side of the polar lug foil (20) away from the polar piece foil (10) and the polar piece foil (10) is L, and L satisfies L >= 10 mm.

7. The pole piece (100) according to claim 6, characterized in that L satisfies L >= 25 mm.

8. The pole piece (100) according to any one of claims 1-7, characterized in that The width of the welding seam (30) welded between the upper foil (21) and one of the plating layers (12) and / or the width of the welding seam (30) welded between the lower foil (22) and the other plating layer (12) is W, and W satisfies 2 mm <= W <= 5 mm.

9. An electric cell (200) made of the pole piece (100) according to any one of claims 1-8, characterized in that, The application further relates to a battery pack (400) comprising at least one polar piece (100).

10. A battery (300) made from the electric cell (200) of claim 9, characterized in that, The application further relates to a battery (300) comprising the battery cell (200).

11. A battery pack (400), characterized by The application further relates to a battery (300) comprising the battery cell (200).

12. An electrical device (500), characterized by The application further relates to a battery pack (400) comprising the battery cell (200).

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