Electrode piece, electrode core, battery, and power device

Abstract

An electrode piece, an electrode core, a battery, and a power device. The electrode piece comprises a current collector and a coating material layer arranged in a stacked manner on the surface of the current collector; the portion of an end part of the current collector exposed out of the coating material layer forms an electrode tab, and foil is arranged on the electrode tab, wherein the ratio of the thickness of the foil to the thickness of the current collector is not greater than 5.

Description

Electrodes, cores, batteries and power equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on December 22, 2023, with application number 202323528506.3 and titled “Pole piece, pole core, battery and power equipment,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of batteries, and in particular, to a pole piece, a pole core, a battery, and a power device. Background Art

[0004] The core of a power battery is primarily composed of a positive electrode sheet, a separator, and a negative electrode sheet. The electrode sheet includes a current collector and a dressing layer. In related technologies, to achieve higher battery capacity, the thickness of the current collector is gradually reduced to allow for more dressing layers within the battery. However, this results in a gradual decrease in the thickness of the tabs formed at both ends of the current collector. This reduced tab thickness reduces the tab's current carrying capacity, leading to excessive temperature rise during fast charging, which affects the battery's fast-charging capability.

[0005] Summary of the Invention

[0006] In order to overcome the problems existing in the related art, the present disclosure provides a pole piece, a pole core, a battery and a power device.

[0007] According to a first aspect of an embodiment of the present disclosure, there is provided a pole piece, comprising:

[0008] a current collector; and

[0009] A dressing layer is stacked on the surface of the current collector,

[0010] The end portion of the current collector exposed from the dressing layer is formed as a tab, and a foil is provided on the tab, wherein the ratio of the thickness of the foil to the thickness of the current collector is not greater than 5.

[0011] According to one embodiment of the present application, a ratio of the thickness of the foil to the thickness of the current collector is 0.5-3.

[0012] According to an embodiment of the present application, the tabs are formed at both ends of the current collector, and the foil is disposed on each tab.

[0013] According to an embodiment of the present application, the foil includes a first foil and a second foil, the thickness of the foil is the sum of the thickness of the first foil and the thickness of the second foil, and the first foil and the second foil are respectively arranged on opposite side surfaces of the tab.

[0014] According to an embodiment of the present application, the first foil and the second foil have the same size.

[0015] According to one embodiment of the present application, in the length direction of the current collector, a distance between an edge of the foil close to the dressing layer and the dressing layer is 0.2 mm to 3 mm.

[0016] According to one embodiment of the present application, in the length direction of the current collector, the edge of the end of the foil away from the dressing layer coincides with the edge of the electrode tab, and in the width direction of the current collector, the edges of both ends of the foil coincide with the edges of both ends of the electrode tab.

[0017] According to an embodiment of the present application, the thickness of the foil is smaller than the thickness of the dressing layer.

[0018] According to an embodiment of the present application, the foil is copper foil or aluminum foil.

[0019] According to one embodiment of the present application, the length of the pole piece is 280mm-1500mm.

[0020] According to an embodiment of the present application, the length of the tab is 10 mm-40 mm.

[0021] According to one embodiment of the present application, the width of the pole piece is 75 mm-198 mm.

[0022] According to an embodiment of the present application, the width of the tab is 50 mm-170 mm.

[0023] According to a second aspect of an embodiment of the present disclosure, a pole core is provided, comprising a plurality of stacked pole pieces, wherein the pole pieces are any of the pole pieces described above.

[0024] According to a third aspect of an embodiment of the present disclosure, a battery is provided, comprising a housing and a pole core disposed in the housing, wherein the pole core is the pole core described above.

[0025] According to one embodiment of the present application, the length of the battery is 300mm-1500mm.

[0026] According to one embodiment of the present application, the width of the battery is 80 mm-200 mm.

[0027] According to one embodiment of the present application, the thickness of the battery is 10 mm-30 mm.

[0028] According to a fourth aspect of an embodiment of the present disclosure, there is provided a power device comprising any one of the batteries described above.

[0029] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: foil is provided on the tabs at both ends of the current collector, and the foil can pass current, which is equivalent to increasing the thickness of the tab. When the thickness of the tab increases, the cross-sectional area of ​​the tab also increases. When the cross-sectional area of ​​the tab increases, the resistance of the tab decreases, and less heat is generated under the same current, and the temperature rise of the tab is smaller. Similarly, under the same temperature rise, the thickened tab can pass a larger current. Without violating the trend of gradually reducing the thickness of the current collector in the related art, the thickness of the tab is guaranteed by the foil. When the tab is used in a battery, it can improve the fast charging capability of the battery while avoiding excessive temperature rise of the tab during fast charging. Based on the improvement effect of the foil on the tab's current carrying capacity and the consideration of the connection process between the foil and the tab, the ratio of the foil thickness to the current collector thickness is not greater than 5, that is, the thickness of the foil is at most 5 times the thickness of the current collector, ensuring the improvement effect of the foil on the tab's current carrying capacity, while also allowing the foil and the tab to be connected by a welding process.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] FIG1 is a schematic structural diagram of a pole piece according to an exemplary embodiment.

[0033] FIG2 is a schematic diagram showing the installation of a foil according to an exemplary embodiment.

[0034] FIG3 is a schematic structural diagram of a pole core according to an exemplary embodiment.

[0035] FIG4 is a schematic diagram showing the installation of a pole core according to an exemplary embodiment.

[0036] FIG5 is a schematic structural diagram of a battery according to an exemplary embodiment.

[0037] FIG6 is a schematic diagram showing the installation of a pole core and a cover plate according to an exemplary embodiment.

[0038] FIG7 is a schematic structural diagram of a pole piece according to an exemplary embodiment, wherein the foil includes a first foil and a second foil.

[0039] Explanation of reference numerals 1 - pole piece, 11 - current collector, 111 - pole ear, 12 - dressing layer, 2 - foil, 21 - first foil, 22 - second foil, 3 - pole core, 31 - first separator, 32 - second separator, 4 - shell, 5 - cover plate, 6 - battery, 7 - casing. DETAILED DESCRIPTION

[0040] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0041] In this disclosure, unless otherwise indicated, directional terms generally refer to the control box provided herein under normal use. "Inside" and "outside" can refer to the inside and outside of the corresponding component's outline or its location inside or outside the environment, depending on the specific context. Additionally, when the following description refers to the accompanying drawings, unless otherwise indicated, identical numbers in different drawings represent identical or similar elements. Terms such as "first" and "second" used in this disclosure are intended to distinguish one element from another and do not convey sequentiality or importance.

[0042] As shown in FIG. 1 to FIG. 4 and FIG. 7 , the present disclosure provides a pole piece 1 , comprising a current collector 11 and a dressing layer 12 , wherein the dressing layer 12 is stacked on the surface of the current collector 11 .

[0043] Taking the application of the electrode 1 in a lithium-ion battery as an example, the current collector 11 is mainly used for electron transmission. The current collector 11 can provide a conductive channel for electrons, so that the current can flow smoothly between the positive and negative electrodes. The current collector 11 in this embodiment can be made of copper foil or aluminum foil commonly used in the field. In a lithium-ion battery, the electrode 1 usually has a electrode 1 as a positive electrode and a electrode 1 as a negative electrode. The current collector 11 on the electrode 1 as the positive electrode can be aluminum foil, and the current collector 11 on the electrode 1 as the negative electrode can be copper foil. If the aluminum foil is used as the negative electrode, when the negative electrode potential is less than 1.0V, the current collector 11 on the electrode 1 as the negative electrode is embedded with lithium to form a lithium-aluminum alloy.

[0044] The dressing layer 12 is also called battery slurry. It can be set on a single side surface of the current collector 11 or on both sides of the current collector 11. The dressing layer 12 affects the capacity and cycle performance of the lithium-ion battery. At the same time, the thickness of the dressing layer 12 is related to the capacity and internal resistance of the lithium-ion battery. In a lithium-ion battery, the dressing layer 12 on the electrode 1 as the positive electrode can be called the positive electrode dressing. The positive electrode dressing is usually made of a mixture of lithium compounds and conductive materials. Its main function is to release positive charges to the outside. The positive electrode dressing can be made of lithium cobalt oxide, ternary materials or lithium iron phosphate commonly used in the field. The dressing layer 12 on the electrode 1 as the negative electrode can be called the negative electrode dressing. The negative electrode dressing can be made of graphite materials commonly used in the field. Its main function is to release negative charges to the outside. Due to the special properties of lithium-ion batteries, the negative electrode dressing generally needs to have certain diffusivity and reversibility to ensure rapid conduction and recycling of charges.

[0045] 1-4 , the portion of the end of the current collector 11 exposed from the dressing layer 12 is formed as a tab 111, on which a foil 2 is provided, wherein the ratio of the thickness of the foil 2 to the thickness of the current collector 11 is no greater than 5. Through the above technical solution, the tab 111 at the end of the current collector 11 is provided with a foil 2, which can increase the thickness of the tab 111. When the thickness of the tab 111 increases, the cross-sectional area of ​​the tab 111 also increases. When the cross-sectional area of ​​the tab 111 increases, the resistance of the tab 111 decreases, thereby increasing the current carrying capacity of the tab 111. Without violating the trend of gradually reducing the thickness of the current collector 11 in the related art, the thickness of the tab 111 is ensured by the foil 2. When the tab 1 is used in the battery 6, the fast charging capability of the battery 6 can be improved, while preventing the temperature rise of the tab 111 from being too high during fast charging. Based on the improvement effect of the foil 2 on the flow capacity of the tab 111 and the connection process of the foil 2 and the tab 111, the ratio of the thickness of the foil 2 to the thickness of the current collector 11 is not greater than 5, that is, the thickness of the foil 2 is at most 5 times the thickness of the current collector 11, which ensures the improvement effect of the foil 2 on the flow capacity of the tab 111, and also enables the foil 2 and the tab 111 to be connected through a welding process.

[0046] It should be noted that the foil 2 mentioned above refers to a metal sheet (such as aluminum foil, copper foil, etc.) with conductive overcurrent capability. The thickness of the foil 2 refers to the thickness of the foil 2 set on a pole lug 111. With reference to Figure 1, the straight-line distance A represents the thickness of the foil 2, and the straight-line distance B represents the thickness of the current collector 11. The thickness of the foil 2 can be selectively adjusted according to the actual requirements of the overcurrent capability of the pole lug 111. As the thickness of the foil 2 on the pole lug 111 increases, the temperature rise of the pole lug 111 decreases when the pole lug 111 is in a weak overcurrent state. When the overcurrent capability of the pole lug 111 reaches the requirement, the effect of improving the temperature rise of the pole lug 111 by increasing the thickness of the foil 2 will gradually decrease.

[0047] The foil 2 and the tab 111 can be connected by a welding process. The integrity of the welding connection is strong, which can ensure the connection area of ​​the foil 2 and the tab 111. The foil 2 and the tab 111 are not easily deformed. At the same time, the welding connection has high welding strength, which ensures the connection strength of the foil 2 and the tab 111. Furthermore, the foil 2 and the tab 111 can be connected by ultrasonic welding or laser welding. Ultrasonic welding is energy-saving and environmentally friendly. It does not require a ventilation device to dissipate smoke and heat, and can achieve seamless welding. Since the tab 111 and the foil 2 are both thin sheets, the connection between the foil 2 and the tab 111 can be achieved by ultrasonic rolling welding. For details, please refer to Figure 2. Figure 2 is a schematic diagram of the installation of the foil 2, showing that the foil 2 is in the process of being installed. During ultrasonic rolling welding, the foil 2 and the tab 111 can be clamped by two rollers, and the foil 2 and the tab 111 are welded together when the rollers move. Laser welding has a high welding speed and can ensure production efficiency. The weld quality of laser welding is high and the shape is good, which can achieve high-precision welding.

[0048] When the electrode 1 is used in the battery 6, multiple electrode sheets 1 need to be stacked to form a pole core 3. Referring to Figures 3 and 4, multiple pole tabs 111 provided with foils 2 can also be connected by ultrasonic welding or laser welding. Based on the production and processing process of the current collector 11 and the production and processing process of the foil 2, and also based on whether the total thickness of the foil 2 and the pole tab 111 can be connected by ultrasonic welding or laser welding, the ratio of the thickness of the foil 2 to the thickness of the current collector 11 can be 0.5-3, that is, the thickness of the foil 2 can be at least 0.5 times the thickness of the current collector 11, and the thickness of the foil 2 can be at most 3 times the thickness of the current collector 11.

[0049] Table 1

[0050] Table 1 shows the temperature rise of the tab 111 after the foil 2 was placed on the tab 111 and applied to the battery 6 under specified experimental conditions. The specified experimental conditions were: ambient temperature 40°C, equivalent current 310A, duration 12 minutes (simulating a 12-minute fast charge from 10% to 80% battery capacity). The temperature rise data was collected using an Agilent data logger. Battery 6 has a thickness of 13.5 mm, and the width of the current collector 1 and foil 2 are both 71 mm, with 35 layers each. The number of layers of the pole piece 1 is 35, indicating that 35 pole pieces 1 are stacked to form the pole core 3. The number of layers of the foil 2 is the same as that of the pole piece 1, indicating that one foil 2 is placed on each tab 111. Taking the example of connecting multiple tabs 111 with foils 2 by ultrasonic welding or laser welding, the weldability of the current collector 11 and foil 2 when connected by ultrasonic welding or laser welding can be determined based on the total thickness of the current collector 11 and foil 2.

[0051] Continuing to refer to Table 1, in the original solution, no foil 2 is provided on the tab 111 in the battery 6. At this time, after fast charging, the temperature rise at the tab 111 of the battery 6 reaches 81.5 degrees Celsius. In Solutions 1 to 7, foil 2 is provided on the tab 111 in the battery 6. After fast charging, the temperature rise at the tab 111 in Solutions 1 to 7 is significantly less than 81.5 degrees Celsius. In addition, depending on the ratio of the thickness of the foil 2 to the thickness of the current collector 11, the magnitude of the temperature rise decrease at the tab 111 in Solutions 1 to 7 is also different. Among them, according to experiments, it is found that when the ratio of the thickness of the foil 2 to the thickness of the current collector 11 is greater than 3, the magnitude of the temperature rise decrease at the tab 111 is no longer significantly improved. Therefore, considering cost and processability, this ratio can be set to 0.5-3.

[0052] In some embodiments, tabs 111 may be formed at both ends of the current collector 11, and a foil 2 may be provided on each tab 111. In this way, the tabs 111 at both ends of the current collector 11 can increase the flow capacity through the foil 2, thereby improving the fast charging capability of the battery 6 and preventing the tabs 111 at both ends of the current collector 11 from overheating during fast charging.

[0053] In some embodiments, the foil 2 may include a first foil 21 and a second foil 22. Specifically, referring to FIG. 7 , the first foil 21 and the second foil 22 are respectively disposed on opposite surfaces of the tab 111. In this case, the thickness of the foil 2 mentioned above refers to the sum of the thicknesses of the first foil 21 and the second foil 22. Furthermore, the first foil 21 and the second foil 22 may have the same dimensions, which may be side length and thickness. In the case of the same dimensions, the first foil 21 and the second foil 22 may be manufactured together and may be connected to the tab 111 in the same manner.

[0054] In some embodiments, in the length direction of the current collector 11, the distance between the edge of the foil 2 at one end close to the dressing layer 12 and the dressing layer 12 can be 0.2mm-3mm. With reference to Figure 1, the straight-line distance C represents the distance between the edge of the foil 2 at one end close to the dressing layer 12 and the dressing layer 12. This allows the foil 2 to be as close to the dressing layer 12 as possible without contacting the dressing layer 12, thereby expanding the area of ​​the foil 2 as much as possible, and allowing the foil 2 to cover the tab 111 as much as possible. In this way, the area with a larger cross-sectional area on the tab 111 will increase compared to the entire tab 111, and the effect of the foil 2 can also be better exerted. The dressing layer 12 on the current collector 11 affects the capacity and cycle performance of the battery 6. At the same time, the thickness of the dressing layer 12 is related to the capacity, internal resistance and other properties of the battery 6, so it is necessary to avoid contact between the foil 2 and the dressing layer 12. It should be noted that the “length direction” here is relative, and specifically refers to the direction in which the tab 111 protrudes from the dressing layer 12 , that is, the left-right direction of the drawing in FIG. 1 .

[0055] When the electrode sheet 1 is used in the battery 6, multiple electrode sheets 1 need to be stacked to form the electrode core 3. Multiple electrode tabs 111 provided with foils 2 need to be connected. When multiple electrode tabs 111 provided with foils 2 are connected, the electrode tab 111 may be partially bent. If the distance between the edge of the foil 2 near the dressing layer 12 and the dressing layer 12 is too small, the foil 2 and the dressing layer 12 will come into contact when the electrode tab 111 bends, thereby affecting the use of the battery 6. If the distance between the edge of the foil 2 near the dressing layer 12 and the dressing layer 12 is too large, the area with a larger cross-sectional area on the electrode tab 111 will be reduced compared to the entire electrode tab 111, and the effect of the foil 2 will be difficult to exert.

[0056] In the length direction of the current collector 11, the edge of the end of the foil 2 away from the dressing layer 12 can overlap with the edge of the tab 111, and in the width direction of the current collector 11, the edges of the foil 2 at both ends can overlap with the edges of the tab 111 at both ends. In this way, the foil 2 can cover the tab 111 as much as possible without extending beyond the edge of the tab 111. The area with a larger cross-sectional area on the tab 111 will increase compared to the entire tab 111, and the effect of the foil 2 can be better exerted.

[0057] The thickness of the foil 2 can be less than the thickness of the dressing layer 12. When the electrode 1 is used in the battery 6, multiple electrode sheets 1 need to be stacked to form the electrode core 3. If the thickness of the foil 2 is greater than or equal to the thickness of the dressing layer 12, it will affect the stacking of the electrode sheets 1 and the strength of the electrode core 3.

[0058] Taking the application of the pole piece 1 in a lithium-ion battery as an example, the current collector 11 is mainly used for electron transmission. The current collector 11 can be made of copper foil or aluminum foil commonly used in the field. The foil is arranged on the pole ears 111 at both ends of the current collector 11. Correspondingly, the foil 2 can also be copper foil or aluminum foil. Copper foil and aluminum foil are relatively stable in the air. Copper foil and aluminum foil have good conductivity, soft texture and low price. It should be noted that the material of the foil 2 is not limited in the present disclosure. If the use requirements of the foil 2 can be met, the foil 2 can be made of any suitable material.

[0059] The present disclosure does not limit the dimensions of the electrode piece 1 and the tab 111. The dimensions of the electrode piece 1 and the tab 111 can be adaptively adjusted according to the dimensions of the battery 6 (e.g., the blade battery described below). For example, the length of the electrode piece 1 can be 280 mm to 1500 mm, the length of the tab 111 can be 10 mm to 40 mm, the width of the electrode piece 1 can be 75 mm to 198 mm, and the width of the tab 111 can be 50 mm to 170 mm.

[0060] According to the second aspect of the present disclosure, a pole core 3 is also provided, comprising a plurality of stacked pole pieces 1. The pole piece 1 is the pole piece 1 of any of the above-mentioned embodiments and has all its beneficial effects, which will not be repeated here.

[0061] A first diaphragm 31 may be provided between the dressing layers 12 of two adjacent pole pieces 1, and a second diaphragm 32 may be provided on the outer surface of the outermost pole core 3. The first diaphragm 31 can prevent the multiple pole pieces 1 from influencing each other, and at the same time play a role in guiding the movement of charge, facilitating the movement of charge from one end to the other. The second diaphragm 32 can prevent the dressing layer 12 on the outer surface of the outermost pole core 3 from contacting other structures. Taking the application of the pole core 3 in lithium-ion batteries as an example, the first diaphragm 31 and the second diaphragm 32 can be made of the same material, for example, respectively made of polyolefin materials commonly used in the field of lithium-ion batteries, and have excellent properties such as high temperature resistance, corrosion resistance, and tear resistance.

[0062] In the electrode core 3, multiple stacked electrode sheets 1 are usually composed of an electrode sheet 1 serving as a positive electrode and an electrode sheet 1 serving as a negative electrode. Taking the foil 2 as a copper foil or an aluminum foil as an example, the foil 2 on the electrode sheet 1 serving as the positive electrode can be an aluminum foil, and the foil 2 on the electrode sheet 1 serving as the negative electrode can be a copper foil. If the aluminum foil serves as the negative electrode, when the negative electrode potential is less than 1.0V, the current collector 11 on the electrode sheet 1 serving as the negative electrode is embedded with lithium to form a lithium-aluminum alloy.

[0063] In the electrode core 3, when the thickness of the electrode core 3 is large, the number of stacked layers of the electrode sheets 1 is large, and the number of electrode tabs 111 that need to be connected is also large. When the number of electrode tabs 111 that need to be connected is large, it is necessary to avoid a thicker thickness of the foil 2. Taking the ultrasonic welding or laser welding mentioned above as an example, when the number of electrode tabs 111 that need to be connected is large and the thickness of the foil 2 is also thick, it will make it difficult to connect multiple electrode tabs 111 by ultrasonic welding or laser welding.

[0064] As shown in Figures 5 and 6, according to the third aspect of the present disclosure, a battery 6 is also provided, comprising a housing 7 and a core 3 disposed within the housing 7. The core 3 is the core 3 described above and has all of its benefits, which will not be described in detail here. The battery 6 here can be a blade battery, which is a long, thin, blade-shaped single-cell lithium iron phosphate battery. Due to its excellent performance, it has been widely used in new energy electric vehicles. As the range requirements of new energy electric vehicles gradually increase, the capacity requirements of blade batteries are gradually increasing. Furthermore, the fast charging capabilities of blade batteries are becoming increasingly stringent. Taking the blade battery as an example, the housing 7 can include a shell 4 and a cover plate 5. The shell 4 forms a through channel, and the cover plate 5 is used to block the channel openings at both ends of the shell 4. As shown in Figure 5, the shell 4 can be constructed to be long, thin, and blade-shaped. The through channel formed by the shell 4 can accommodate the core 3. At the same time, the shell 4 can also limit the core 3 and ensure the stability of the core 3. Continuing with Figure 6, the tabs 111 at both ends of the core 3 are respectively connected to the cover plate 5. The cover plate 5 seals the housing 4 and further protects the pole core 3. The cover plate 5 may be provided with a connection structure for interconnecting multiple blade batteries. Through the connection structure of the cover plate 5, multiple blade batteries can be interconnected to form a blade battery pack, allowing the blade batteries to be applied in more scenarios.

[0065] Despite their uniquely long and thin shape, blade batteries, despite their strong overall product capabilities, also have a relative weakness: fast charging. Material differences aside, due to structural limitations, blade batteries have a significantly greater internal resistance during use than conventional power batteries. Adding fast charging functionality to blade batteries would generate even more heat during fast charging, primarily at the tabs 111. This would hinder heat dissipation within the battery pack. During fast charging, the temperature difference between the ends of the blade battery and the center of the battery would widen, impacting various performance aspects. This is especially true as blade batteries increase in capacity and the electrode sheets 1 become thinner, allowing for more coating layers. The battery pack requires highly consistent temperature uniformity during fast charging, further increasing the heat dissipation pressure.

[0066] Continuing with Figure 5, in Figure 5, the straight-line distance D represents the length of the blade battery, the straight-line distance E represents the width of the blade battery, and the straight-line distance F represents the thickness of the blade battery. The length of the blade battery can be 300mm-1500mm. Here, blade batteries with a length of 300mm-700mm can be called short blade batteries, and blade batteries with a length of 700mm-1500mm can be called long blade batteries. "Long blade" and "short blade" are relative terms and are not strictly defined. Regardless of whether it is a long blade battery or a short blade battery, the width of the blade battery can be 80mm-200mm, and the thickness of the blade battery can be 10mm-30mm. In this way, the only difference between long blade batteries and short blade batteries is their length.

[0067] As described above, the dimensions of the electrode sheet 1 and the tab 111 can be adjusted based on the dimensions of the blade battery. The width of the tab 111 can be designed based on the width of the blade battery. The wider the blade battery, the wider the electrode core 3 accommodated within it, and thus the wider the tab 111 can also be. The length of the tab 111 can be designed based on the thickness of the blade battery. The thicker the blade battery, the longer the tab 111 will need to be.

[0068] According to a fourth aspect of the present disclosure, a power device is provided, comprising the battery 6 of any of the above embodiments, and having all the advantages thereof, which are not described in detail here. The power device may be a power device requiring the battery 6, such as a new energy electric vehicle.

[0069] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A pole piece, characterized in that: include: Current collector(11); and A dressing layer (12) is stacked on the surface of the current collector (11), The end of the current collector (11) exposed from the dressing layer (12) is formed as a pole ear (111), and a foil (2) is arranged on the pole ear (111), wherein the ratio of the thickness of the foil (2) to the thickness of the current collector (11) is not greater than 5.

2. The pole piece according to claim 1, characterized in that: The ratio of the thickness of the foil (2) to the thickness of the current collector (11) is 0.5-3.

3. The pole piece according to claim 1 or 2, characterized in that: The pole ears (111) are respectively formed at both ends of the current collector (11), and the foil (2) is respectively arranged on each pole ear (111).

4. The pole piece according to any one of claims 1 to 3, characterized in that: The foil (2) comprises a first foil (21) and a second foil (22); the thickness of the foil (2) is the sum of the thickness of the first foil (21) and the thickness of the second foil (22); the first foil (21) and the second foil (22) are respectively arranged on opposite side surfaces of the electrode tab (111).

5. The pole piece according to claim 4, characterized in that: The first foil (21) and the second foil (22) have the same size.

6. The pole piece according to any one of claims 1 to 5, characterized in that: In the length direction of the current collector (11), the distance between the edge of one end of the foil (2) close to the dressing layer (12) and the dressing layer (12) is 0.2 mm to 3 mm.

7. The pole piece according to any one of claims 1 to 6, characterized in that: In the length direction of the current collector (1), the edge of the foil (2) at one end away from the dressing layer (12) coincides with the edge of the pole lug (111), and in the width direction of the current collector (11), the edge of the foil (2) coincides with the edge of the pole lug (12).

8. The pole piece according to any one of claims 1 to 7, characterized in that: The thickness of the foil (2) is smaller than the thickness of the dressing layer (12).

9. The pole piece according to any one of claims 1 to 8, characterized in that: The foil (2) is copper foil or aluminum foil.

10. The pole piece according to any one of claims 1 to 9, characterized in that: The length of the pole piece (1) is 280 mm-1500 mm.

11. The pole piece according to any one of claims 1 to 10, characterized in that: The length of the pole ear (111) is 10 mm to 40 mm.

12. The pole piece according to any one of claims 1 to 11, characterized in that: The width of the pole piece (1) is 75 mm-198 mm.

13. The pole piece according to any one of claims 1 to 12, characterized in that: The width of the pole lug (111) is 50 mm to 170 mm.

14. A pole core, characterized in that: The pole core (3) comprises a plurality of pole pieces (1) arranged in a stacked manner, and the pole piece (1) is the pole piece (1) according to any one of claims 1 to 13.

15. A battery, characterized in that: The battery (6) comprises a housing (7) and a pole core (3) arranged in the housing (7), and the pole core (3) is the pole core (3) described in claim 14.

16. The battery according to claim 15, characterized in that The length of the battery (6) is 300 mm-1500 mm.

17. The battery according to claim 15 or 16, characterized in that: The width of the battery (6) is 80 mm-200 mm.

18. The battery according to any one of claims 15 to 17, characterized in that: The thickness of the battery (6) is 10 mm to 30 mm.

19. A power device, characterized in that: A battery (6) comprising the battery (6) according to any one of claims 15 to 18.

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