Pole piece, battery and electric device
By making the electrode and the electrode sheet body independently mold, the problems of foil scrapping and dust loss during die-cutting of the electrode are solved, and cost savings, production efficiency improvement and battery safety are achieved.
Patent Information
- Application Number
- CN202421526929.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the prior art, the foil is scrapped and dust falls into the active material layer during die cutting, resulting in cost loss and battery safety hazards.
By making the electrode ear and the electrode sheet body independently molded, the amount of scrap foil material when die-cutting the electrode ear is reduced, and dust is prevented from falling into the active material layer.
It has achieved the reduction of foil scrapping, reduced costs, improved production efficiency, and improved battery safety and overall performance.
Smart Images
Figure CN222867700U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a pole piece, a battery and an electric device. Background Art
[0002] The pole piece is an important part of the battery, including the pole piece body and the pole ear, and the pole piece body is coated with an active material layer. In the related art, the pole ear is formed by die-cutting on the pole piece. During the die-cutting process, part of the pole piece needs to be die-cut off. In this way, each die-cut pole piece will produce part of the foil scrapped, so there is a large cost loss caused by the scrapping of the foil.
[0003] In addition, due to the need for die-cutting of the tabs, when coating the active material layer on the foil, it is necessary to reserve the width of the tab die-cutting, that is, a relatively large empty foil area needs to be reserved at one end of the foil. For example, if the tab is located on one side of the pole piece along the first direction, then it is necessary to reserve an empty foil area at one end of the foil along the first direction and the empty foil area extends to both sides of the pole piece along the second direction of the pole piece, that is, the entire end of the foil along the first direction needs to reserve an empty foil area, which affects the efficiency of the coating. Moreover, the dust generated when die-cutting the tabs may fall into the active material layer, making it difficult to clean the dust generated when the tabs are cut, and the dust that falls into the active material layer and cannot be cleaned will pierce the diaphragm, causing a short circuit between the positive and negative pole pieces. Therefore, improvements are needed. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a pole piece, the pole piece includes a pole piece body and a pole ear, by making the pole ear and the pole piece body separately formed, the amount of scrapped foil when die-cutting the pole ear can be reduced, the cost can be saved, and the dust generated when die-cutting the pole ear can be prevented from falling on the active material layer, which is difficult to clean or even pierces the diaphragm to cause a short circuit, thereby ensuring the safety of the battery; and, since the pole ear and the pole piece body are separately formed, when coating the active material layer on the foil, it is not necessary to reserve a large empty foil area for the die-cut pole ear, and a larger number of widths can be used for coating, thereby improving production efficiency; in addition, by limiting the difference between the width of the empty foil area in the first direction and the width of the overlap portion in the first direction to 0.5mm to 20mm, the pole ear can be prevented from covering the active material layer, thereby improving the safety of the battery, and at the same time, it can be avoided that the remaining area of the empty foil area is easy to wrinkle due to the large remaining area of the empty foil area and the influence on the energy density, thereby ensuring the overall performance of the battery.
[0005] The utility model also provides a battery with the pole piece.
[0006] The utility model also provides an electric device having the battery.
[0007] The pole piece according to the embodiment of the first aspect of the utility model includes: a pole piece body, including an edge area and a coating area arranged along a first direction, the coating area is used to coat a first active material layer, and the edge area includes a hollow foil area; a pole ear, the pole ear and the pole piece body are independently formed, and the pole ear is connected to the hollow foil area; wherein the pole ear includes a lap portion, the lap portion is overlapped and connected to the hollow foil area, and the difference between the width of the hollow foil area in the first direction and the width of the lap portion in the first direction is 0.5mm to 20mm.
[0008] According to the pole piece of the embodiment of the utility model, by making the pole ear and the pole piece body independently molded respectively, the amount of scrapped foil when die-cutting the pole ear can be reduced, the cost can be saved, and the dust generated when die-cutting the pole ear can be avoided from falling on the active material layer, which is difficult to clean and even pierces the diaphragm to cause a short circuit, thereby ensuring the safety of the battery; and, since the pole ear and the pole piece body are independently molded respectively, when coating the active material layer on the foil, it is not necessary to reserve a large empty foil area for the die-cut pole ear, and a larger number of widths can be used for coating, thereby improving production efficiency; in addition, by limiting the difference between the width of the empty foil area in the first direction and the width of the overlap portion in the first direction to 0.5mm to 20mm, it is possible to avoid the pole ear covering the active material layer, thereby improving the safety of the battery, and at the same time, it is possible to avoid the remaining area of the empty foil area being prone to wrinkles due to the large remaining area of the empty foil area and the influence on the energy density, thereby ensuring the overall performance of the battery.
[0009] According to some embodiments of the present invention, a difference between a width of the empty foil area in the first direction and a width of the overlapping portion in the first direction is 1 mm to 6 mm.
[0010] According to some embodiments of the present invention, the width of the overlapping portion in the first direction is 1 mm to 20 mm.
[0011] According to some embodiments of the present invention, the overlapping portion is connected to the empty foil area by welding or by a conductive adhesive layer.
[0012] According to some embodiments of the present invention, the first active material layer includes a first side layer close to the empty foil area in the first direction, and the thickness of the first side layer is uniform.
[0013] According to some embodiments of the present invention, the edge area includes an additional coating area, the additional coating area and the empty foil area are arranged along a second direction, the second direction intersects with the first direction, and the additional coating area is covered with a second active material layer.
[0014] According to some embodiments of the present invention, the thickness of the second active material layer is consistent with the thickness of the first active material layer.
[0015] According to some embodiments of the present invention, the second active material layer includes a second side layer close to the empty foil area in the second direction, and the thickness of the second side layer is uniform.
[0016] According to some embodiments of the utility model, there are one or two pole ears located on one side of the pole piece body along the first direction. When there are two pole ears, the two pole ears are overlapped along the thickness direction of the pole piece body and are respectively connected to the opposite sides of the thickness direction of the empty foil area.
[0017] A battery according to an embodiment of the second aspect of the utility model includes: a pole piece according to an embodiment of the first aspect of the utility model.
[0018] According to the battery of the embodiment of the utility model, by providing the above-mentioned pole piece, it is possible to reduce the scrapping of foil materials, reduce costs, and improve the production efficiency of the battery.
[0019] According to an embodiment of the third aspect of the utility model, the electric device comprises: a battery according to an embodiment of the second aspect of the utility model.
[0020] According to the power-consuming device of the embodiment of the utility model, by providing the above-mentioned battery, the battery can reduce the scrapping of foil materials, reduce costs, and improve the production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0022] Figure 1 is a schematic diagram of a pole piece according to some embodiments of the utility model;
[0023] Figure 2 yes Figure 1 A schematic diagram of the middle pole piece from another angle;
[0024] Figure 3 yes Figure 1 Schematic diagram of the assembly process of the middle pole piece;
[0025] Figure 4 is a schematic diagram of pole pieces according to other embodiments of the utility model;
[0026] Figure 5 yes Figure 4 A schematic diagram of the middle pole piece from another angle;
[0027] Figure 6 yes Figure 4 Schematic diagram of the assembly process of the middle pole piece;
[0028] Reference numerals:
[0029] 100, pole piece;
[0030] 10. Pole body; 11. Edge area; 12. Coating area; 13. Empty foil area; 14. Additional coating area; 15. First side layer; 16. Second side layer;
[0031] 20. Tab; 21. Overlapping portion;
[0032] 30. First active material layer; 40. Second active material layer. DETAILED DESCRIPTION
[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0034] Reference below Figure 1-Figure 6 A pole piece 100 according to an embodiment of the present invention is described.
[0035] Reference Figure 1-Figure 6 According to the first aspect of the present utility model, the pole piece 100 includes a pole piece body 10 and a pole ear 20 .
[0036] The pole tab 20 and the pole piece body 10 are formed independently, and the pole tab 20 is connected to the pole piece body 10. The pole tab 20 and the pole piece body 10 are processed and formed separately and then connected and assembled to form the pole piece 100. The pole piece 100 can be a positive pole piece or a negative pole piece.
[0037] The pole piece body 10 includes an edge area 11 and a coating area 12 arranged along a first direction (for example, refer to the e1 direction in the figure), and the coating area 12 is used to coat the first active material layer 30. Among them, the edge area 11 includes a hollow foil area 13, and the pole ear 20 is connected to the hollow foil area 13.
[0038] For example, refer to Figure 3 and Figure 6The manufacturing method of the pole piece 100 of the embodiment of the utility model can be as follows: firstly, the pole piece body 10 and the pole ear 20 are processed separately, and then the pole ear 20 is connected to the pole piece body 10. By using the method of forming the pole piece body 10 and the pole ear 20 separately and then connecting them, the amount of scrapped foil when die-cutting the pole ear 20 can be reduced, saving costs, and it can also prevent the dust generated when die-cutting the pole ear 20 from falling on the active material layer, which is difficult to clean or even pierces the diaphragm to cause a short circuit, thereby ensuring the safety of the battery.
[0039] Furthermore, since the pole ear 20 and the pole piece body 10 are formed independently, when coating the active material layer on the foil, it is not necessary to reserve a relatively long empty foil area 13 for the die-cut pole ear 20, and a larger number of widths can be used for coating, which can improve production efficiency. For example, when processing the pole piece body 10, the active material layer is first coated on the foil. When coating the active material layer on the foil, it is no longer necessary to consider reserving a relatively long and large empty foil area 13 for the die-cut pole ear 20, and a larger area can be coated. In this way, a larger number of widths can be used for coating, and even full-width coating can be used, which can improve coating efficiency, reduce coating process time, and improve production efficiency; then remove part of the active material layer covering the foil to form an empty foil area 13, which is used to connect with the pole ear 20; and then cut into multiple pole piece bodies 10.
[0040] Optionally, a portion of the active material layer covering the foil may be removed by laser cleaning to form an empty foil area 13 .
[0041] By forming the pole ear 20 and the pole piece body 10 separately, the amount of scrapped foil during the processing of the pole piece 100 can be reduced, which can reduce costs. In addition, since the pole ear 20 is formed independently, when processing the pole ear 20, for example, die-cutting the foil to form the pole ear 20, the pole ear 20 can be cleaned separately after cutting and then connected to the pole piece body 10. The metal dust generated in the process will not fall into the active material layer, which is easier to clean, and the dust falling into the active material layer can be prevented from piercing the diaphragm to cause a short circuit, thereby ensuring the safety of the battery.
[0042] For example, when processing the pole ear 20, the foil is directly cut into multiple pole ears 20. The processing efficiency of the pole ear 20 is high, and the dust generated during the die-cutting process of the pole ear 20 is also convenient to clean. Since the processing and forming process of the pole ear 20 and the pole piece body 10 are relatively independent, the dust generated during the die-cutting process of the pole ear 20 will not affect the pole piece body 10. This can avoid the dust generated during the processing and die-cutting of the pole ear 20 or the burrs on the corners of the pole ear 20 from damaging the active material layer, thereby improving the performance and safety of the battery.
[0043] According to the pole piece 100 of the embodiment of the utility model, by forming the pole ear 20 and the pole piece body 10 separately and independently, the amount of scrapped foil when die-cutting the pole ear 20 can be reduced, saving costs, and it can be avoided that the dust generated when die-cutting the pole ear 20 falls on the active material layer and is difficult to clean or even pierces the diaphragm to cause a short circuit, thereby ensuring the safety of the battery; and, since the pole ear 20 and the pole piece body 10 are separately formed independently, when coating the active material layer on the foil, there is no need to reserve a longer empty foil area for the die-cut pole ear 20, and a larger number of widths can be used for coating, which can improve production efficiency.
[0044] According to some embodiments of the present invention, reference Figure 1 and Figure 4 The tab 20 includes a lap portion 21, which is overlapped and connected to the empty foil area 13. By overlapping the tab 20 and the empty foil area 13, the connection between the tab 20 and the empty foil area 13 can be made more reliable and stable, preventing the tab 20 from falling off and causing battery failure.
[0045] For example, the overlapping portion 21 of the pole tab 20 and the empty foil area 13 of the pole piece body 10 may be connected by welding or by a conductive adhesive layer.
[0046] According to some embodiments of the present invention, reference Figure 1 and Figure 4 , the difference between the width of the empty foil area 13 in the first direction and the width of the overlapping portion 21 in the first direction is b, and the value range of b is 0.5mm to 20mm. For example, the difference between the width of the empty foil area 13 in the first direction and the width of the overlapping portion 21 in the first direction can be 0.5mm, 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc.
[0047] If the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction is less than 1 mm, the tab 20 is likely to contact or overlap with the first active material layer, and the original active material layer of this part is covered, the effect is reduced, and metal ions are directly precipitated on the tab 20 in the overlapping area, which may cause a short circuit or failure of the battery. By limiting the value range of the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction to not less than 0.5 mm, the tab 20 can be prevented from covering or contacting the first active material layer 30, thereby improving the safety of the battery.
[0048] If the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction is too wide, the empty foil area 13 corresponding to the difference portion will not only fail to connect with the pole lug 20, but will also occupy a large area of the pole piece body 10, resulting in a reduction in the proportion of the active material layer covered by the pole piece body 10 per unit area, which is not conducive to improving the energy density of the battery. By limiting the value range of the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction to no more than 20 mm, it is possible to avoid wasting foil material and save costs, and it is also possible to increase the proportion of the active material layer covered on the pole piece body 10 and improve the energy density of the battery.
[0049] By limiting the difference between the width of the empty foil area 13 in the first direction and the width of the overlapping portion 21 in the first direction to 0.5 mm to 20 mm, the tab 20 can be prevented from covering the first active material layer 30, thereby improving the safety of the battery. At the same time, the remaining area of the empty foil area 13 can be prevented from being easily wrinkled due to the large remaining area of the empty foil area, as well as the impact on the energy density, thereby ensuring the overall performance of the battery.
[0050] According to some optional embodiments of the present utility model, the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction is in the range of 1 mm to 6 mm. For example, the difference between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc. By limiting the value range of the difference b between the width of the empty foil area 13 in the first direction and the width of the overlap portion 21 in the first direction to no more than 6 mm, it is possible to further avoid wasting foil material and save costs, and it is also possible to further increase the proportion of the active material layer covered on the pole piece body 10, and further increase the energy density of the battery; it is possible to better avoid the remaining area of the empty foil area 13 being prone to wrinkles and the influence on the energy density due to the large remaining area of the empty foil area, thereby better ensuring the overall performance of the battery.
[0051] According to some embodiments of the present invention, reference Figure 1 and Figure 4 , the width of the overlap portion 21 in the first direction is a, and the value range of a is 1mm to 20mm. For example, the width of the overlap portion 21 in the first direction can be 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc. By limiting the value range of the width a of the overlap portion 21 in the first direction to not less than 1mm, the tab 20 and the empty foil area 13 can have a sufficient overlapping area, so that the tab 20 and the empty foil area 13 can be firmly connected.
[0052] If the overlap portion 21 is too wide, the corresponding empty foil area 13 is widened, and the empty foil area 13 occupies a larger area of the pole piece body 10, which will result in a reduction in the proportion of the active material layer covered by the pole piece body 10 per unit area, which is not conducive to improving the specific capacity of the battery. By limiting the value range of the width a of the overlap portion 21 in the first direction to no more than 20 mm, it is possible to avoid wasting foil material and save costs, and it is also possible to increase the proportion of the active material layer covered on the pole piece body 10 and improve the specific capacity of the battery.
[0053] According to some embodiments of the utility model, the pole tab 20 is connected to the empty foil area 13 by welding or by a conductive adhesive layer, for example, the lap portion 21 of the pole tab 20 is connected to the empty foil area 13 by welding or by a conductive adhesive layer. For example, the pole tab 20 and the empty foil area 13 can be connected by welding, and the welding connection can ensure the electrical conductivity between the pole tab 20 and the pole piece body 10, and can make the connection between the pole tab 20 and the empty foil area 13 more firm and more stable. For example, the pole tab 20 and the empty foil area 13 can also be connected by gluing a conductive adhesive layer, and the process of gluing is simple, and by gluing the pole tab 20 and the empty foil area 13 by using a conductive adhesive layer, the electrical conductivity between the pole tab 20 and the pole piece body 10 can be ensured.
[0054] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The first active material layer 30 covering the coating area 12 includes a first side layer 15 close to the empty foil area 13 in the first direction, and the thickness of the first side layer 15 is uniform. By making the thickness of the first side layer 15 uniform, the amount of active material that can be covered per unit area of the pole piece 100 at the first side layer 15 can be made consistent, ensuring that the first side layer 15 of the pole piece 100 is consistent with other parts of the pole piece 100, thereby improving the performance of the battery.
[0055] According to some embodiments of the present invention, the pole piece body 10 includes an edge region 11 and a coating region 12 arranged along a first direction (eg, refer to the e1 direction in the drawings), and the coating region 12 is used to coat the first active material layer 30 .
[0056] The edge region 11 includes an empty foil region 13 and an additional coating region 14 arranged along a second direction (for example, refer to the e2 direction in the attached figure), the pole ear 20 is connected to the empty foil region 13, and the second direction intersects with the first direction, for example, the second direction is perpendicular to the first direction. The additional coating region 14 is covered with a second active material layer 40. By covering the second active material layer 40 with the additional coating region 14, the area ratio of the active material layer on the pole piece 100 can be increased, so that the battery has a higher specific capacity and the energy density of the battery is improved.
[0057] For example, refer to Figure 1 and Figure 2 , the additional coating area 14 can be completely covered with the second active material layer 40. By covering the entire additional coating area 14 with the second active material layer 40, the coverage area of the active material layer on the pole piece 100 can be significantly increased, and the energy of the battery can be more significantly improved.
[0058] Since the pole ear 20 and the pole piece body 10 are formed separately, when the active material layer is coated on the foil, it is not necessary to reserve a relatively long empty foil area 13 for the die-cut pole ear 20. The area of the empty foil area 13 is reduced, and the coating area 12 of the active material layer on the foil is increased, so that the coverage ratio of the active material layer of the pole piece body 10 is larger, thereby improving the energy density of the battery. Among them, the above-mentioned additional coating area 14 is an enlarged coating area on the pole piece body 10.
[0059] In addition, dividing the edge area 11 of the pole piece body 10 into a hollow foil area 13 and a coating area 14 can not only make full use of the areas on both sides of the hollow foil area 13 along the second direction to coat the active material layer and improve the energy density of the battery, but also connect the pole ear 20 to the hollow foil area 13, so that the pole ear 20 can be separated from the active material layer, avoiding the pole ear 20 covering part of the active material layer and reducing the effect of the active material layer in the covered part, and can avoid metal ions such as lithium ions directly precipitating on the part of the pole ear 20 covering the active material layer, which may cause battery short circuit or failure, thereby improving the safety of the battery.
[0060] The pole piece 100 in the above embodiment can reduce the amount of scrapped foil when die-cutting the pole piece 20 by independently forming the pole piece 20 and the pole piece body 10, saving costs, and can prevent the dust generated when die-cutting the pole piece 20 from falling on the active material layer and being difficult to clean or even piercing the diaphragm to cause a short circuit, thereby ensuring the safety of the battery; and, since the pole piece 20 and the pole piece body 10 are independently formed, when coating the active material layer on the foil, it is not necessary to reserve a large empty foil area for the die-cut pole piece 20, and a larger number of widths can be used for coating, which can improve production efficiency, and the area of the empty foil area 13 is reduced, which increases the coating area 12 on the foil where the active material layer is coated, so that the coverage ratio of the active material layer of the pole piece body 10 is larger, which can improve the energy density of the battery.
[0061] According to some embodiments of the present invention, the thickness of the second active material layer 40 covering the additional coating area 14 is consistent with the thickness of the first active material layer 30 covering the coating area 12. By making the thickness of the active material layer covering the additional coating area 14 and the coating area 12 consistent, the amount of active material layer covered per unit area of the additional coating area 14 and the coating area 12 can be made consistent, thereby ensuring the consistency of the additional coating area 14 and the coating area 12 and improving the performance of the battery.
[0062] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The second active material layer 40 covering the additional coating area 14 includes a second side layer 16 close to the empty foil area 13 in the second direction, and the thickness of the second side layer 16 is uniform. By making the thickness of the second side layer 16 uniform, the amount of active material layer that can be covered per unit area of the electrode 100 at the second side layer can be made consistent, ensuring that the second side layer 16 of the electrode 100 is consistent with other parts of the electrode 100, thereby improving the performance of the battery.
[0063] According to some embodiments of the present invention, there are one or two pole ears 20 located on one side of the pole piece body 10 along the first direction. Figure 1-Figure 3 , there is one tab 20, one tab 20 is connected to the empty foil area 13, and the tab 20 can be connected to one side in the thickness direction of the empty foil area 13. For example, referring to 4- Figure 6 When there are two pole tabs 20, the two pole tabs 20 are stacked along the thickness direction of the pole piece body 10. The two pole tabs 20 are respectively connected to the opposite sides of the thickness direction of the empty foil area 13. For example, the two pole tabs 20 are stacked along the thickness direction of the pole piece body 10, and are respectively welded to the opposite sides of the thickness direction of the empty foil area 13 of the pole piece 100. By welding the pole piece 100 to the two pole tabs 20 respectively, the connection between the pole tab 20 and the pole piece 100 can be made stronger, and the resistance at the connection between the pole tab 20 and the pole piece 100 can also be reduced, thereby reducing the internal resistance of the battery.
[0064] The battery according to the embodiment of the second aspect of the utility model includes the pole piece 100 according to the embodiment of the first aspect of the utility model.
[0065] According to the battery of the embodiment of the utility model, by providing the pole piece 100, it is possible to reduce the scrapping of foil materials, reduce costs, and improve the production efficiency of the battery.
[0066] The electrical device according to the embodiment of the third aspect of the utility model comprises the battery according to the embodiment of the second aspect of the utility model.
[0067] Optionally, the electrical device may be an electric vehicle, for example, an electric car.
[0068] According to the power-consuming device of the embodiment of the utility model, by providing the above-mentioned battery, the battery can reduce the scrapping of foil materials, reduce costs, and improve the production efficiency of the battery.
[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0070] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.
[0071] In the description of the present invention, "plurality" means two or more.
[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A pole piece, characterized in that: include: The pole piece body comprises an edge area and a coating area arranged along a first direction, wherein the coating area is used to coat a first active material layer, and the edge area comprises a hollow foil area; A pole ear, wherein the pole ear and the pole piece body are independently formed, and the pole ear is connected to the empty foil area; The tab includes an overlapped portion, the overlapped portion is overlapped and connected to the empty foil area, and the difference between the width of the empty foil area in the first direction and the width of the overlapped portion in the first direction is 0.5 mm to 20 mm.
2. The pole piece according to claim 1, characterized in that: The difference between the width of the empty foil area in the first direction and the width of the overlapping portion in the first direction is 1 mm to 6 mm.
3. The pole piece according to claim 1, characterized in that: The width of the overlapping portion in the first direction is 1 mm to 20 mm.
4. The pole piece according to claim 1, characterized in that: The overlapping portion is connected to the empty foil area by welding or by a conductive adhesive layer.
5. The pole piece according to claim 1, characterized in that: The first active material layer includes a first side layer close to the empty foil area in the first direction, and the thickness of the first side layer is uniform.
6. The pole piece according to claim 1, characterized in that: The edge area includes a coating-added area, the coating-added area and the empty foil area are arranged along a second direction, the second direction intersects with the first direction, and the coating-added area is covered with a second active material layer.
7. The pole piece according to claim 6, characterized in that: The thickness of the second active material layer is consistent with the thickness of the first active material layer; and / or the second active material layer includes a second side layer close to the empty foil area in the second direction, and the thickness of the second side layer is uniform.
8. The pole piece according to any one of claims 1 to 7, characterized in that: There is one or two pole ears located on one side of the pole piece body along the first direction. When there are two pole ears, the two pole ears are overlapped along the thickness direction of the pole piece body and are respectively connected to opposite sides of the empty foil area in the thickness direction.
9. A battery, characterized in that: include: A pole piece according to any one of claims 1 to 8.
10. An electrical device, characterized in that: include: The battery according to claim 9.