Battery monomer, battery and electric equipment

Abstract

The utility model discloses a single battery, a battery and electric equipment, the single battery comprises a shell, an electrode structure and a current collecting assembly, and the shell is internally provided with a mounting cavity; the electrode structure is arranged in the mounting cavity and comprises a pole piece and a pole lug; the current collecting assembly is arranged on the shell, the current collecting assembly comprises a current collecting disc, the current collecting disc is provided with a through hole for the pole lug to penetrate through, the first end of the pole lug is electrically connected with the pole piece, and the second end of the pole lug is electrically connected with the current collecting disc.

Description

Technical Field

[0001] The present application relates to the technical field of battery cells, and in particular, to a battery cell, a battery, and an electrical device. Background Art

[0002] A battery cell usually includes a tab and a current collector plate. When processing the battery cell, it is necessary to weld the tab to the current collector plate to conduct the current inside the battery cell. In the related art, the welding area of the current collector plate with the tab is located at the bottom of the current collector plate. Therefore, it is difficult to detect the welding reliability after the tab is welded to the current collector plate. In this way, when problems such as virtual welding and missed welding occur, it is easy to cause problems such as an increase in the DC internal resistance at the connection between the tab and the current collector plate, insufficient overcurrent capacity, and an increase in heat generation. Summary of the Utility Model

[0003] To solve the above technical problems, the purpose of the present application is to provide a battery cell, a battery, and an electrical device.

[0004] The first aspect of the present application provides a battery cell, which includes a housing, an electrode structure, and a current collection assembly. An installation cavity is provided inside the housing; the electrode structure is arranged in the installation cavity, and the electrode structure includes a pole piece and a tab; the current collection assembly is arranged on the housing, and the current collection assembly includes a current collector plate. A through hole for the tab to pass through is provided on the current collector plate. The first end of the tab is electrically connected to the pole piece, and the second end of the tab is electrically connected to the current collector plate.

[0005] The battery cell provided by the embodiment of the present application includes a housing, an electrode structure, and a current collection assembly. An installation cavity is provided inside the housing, and the installation cavity can provide an installation space for the electrode structure; the electrode structure includes a pole piece and a tab, and the pole piece is electrically connected to the current collection assembly through the tab to conduct the current between the pole piece inside the battery cell and the external pole column; the current collection assembly is arranged on the housing, and the current collection assembly includes a current collector plate. A through hole for the tab to pass through is provided on the current collector plate. Here, when the tab is electrically connected to the current collector plate, the first end of the tab is electrically connected to the pole piece, and the second end of the tab can pass through the through hole and be electrically connected to the side of the current collector plate facing away from the pole piece. In this way, the electrical connection position between the tab and the current collector plate is in a visible state, which is convenient for detecting the reliability of the connection between the tab and the current collector plate. Through detection, the probability of virtual welding and missed welding between the tab and the current collector plate can be reduced; the second end of the tab can also not pass through the through hole, and the second end of the tab can be electrically connected to the side of the current collector plate close to the pole piece. At this time, the reliability of the connection between the tab and the current collector plate can be detected through the through hole, and the probability of virtual welding and missed welding between the tab and the current collector plate can also be reduced. In summary, the battery cell provided by the embodiment of the present application can improve the reliability of the electrical connection between the tab and the current collector plate.

[0006] In some embodiments of the present application, the second end of the tab passes through the through hole and is electrically connected to the side of the current collector plate facing away from the pole piece.

[0007] In some embodiments of the present application, the current collector plate includes a main body portion and a connecting portion. The connecting portion is flexibly connected to the main body portion. A through hole is provided on the main body portion, and the connecting portion is located in the through hole. One side of the connecting portion facing the electrode plate is electrically connected to the second end of the tab; the connecting portion can swing towards the side away from the electrode plate to expose the through hole; when the connecting portion exposes the through hole, the second end of the tab can pass through the through hole to be electrically connected to the connecting portion.

[0008] In some embodiments of the present application, the connecting portion is connected to the hole wall of the through hole through a bending portion, and the shape of the through hole is adapted to the shape of the connecting portion so that the connecting portion can be adaptively accommodated in the through hole.

[0009] In some embodiments of the present application, the electrode structure includes at least two tabs, and the current collector plate includes at least two connecting portions. The number of tabs is the same as the number of connecting portions so that the tabs and the connecting portions correspond one by one.

[0010] In some embodiments of the present application, the electrode plate is wound in the installation cavity to form at least two layers of electrode plate units. At least two tabs are arranged at intervals in the circumferential direction of the electrode plate. In the axial direction of the electrode plate, the tab and the corresponding connecting portion are arranged opposite to each other.

[0011] In some embodiments of the present application, the tab is electrically connected to at least two layers of electrode plate units, and in at least two layers of electrode plate units, there is at least one layer of electrode plate unit that is electrically connected to at least two tabs at the same time.

[0012] In some embodiments of the present application, in the radial direction of the electrode plate, the tab includes at least two layers of tab units. The first end of the tab unit is electrically connected to the electrode plate unit, and the second end of the tab unit is electrically connected to the connecting portion. In the direction close to the connecting portion, the distance between the first end and the second end of adjacent tab units gradually decreases.

[0013] In some embodiments of the present application, the current collector plate includes a positive current collector plate and a negative current collector plate. The positive current collector plate and the negative current collector plate are arranged on the same end face of the housing. The tab includes a positive tab and a negative tab. The positive tab is electrically connected to the positive current collector plate, and the negative tab is electrically connected to the negative current collector plate.

[0014] In some embodiments of the present application, the battery cell includes a top cover and a terminal post. The top cover is arranged on the housing, and the top cover is located on the side of the current collector assembly away from the electrode structure. The terminal post is arranged on the top cover. The positive current collector plate has a positive connection section, and the positive connection section is electrically connected to the terminal post. The negative current collector plate has a negative connection section, and the negative connection section is electrically connected to the top cover and the housing respectively.

[0015] In some embodiments of the present application, the current collector assembly further includes an insulating support. The positive current collector plate and the negative current collector plate are both disposed on the insulating support, and are insulated from each other. The insulating support is provided with an avoidance structure for the tab to pass through, and the insulating support has a first support surface and a second support surface. The positive connection section is disposed on the first support surface, and the first support surface protrudes toward the pole column to support the electrical connection between the positive connection section and the pole column. The negative connection section is disposed on the second support surface, and the second support surface protrudes toward the top cover to support the electrical connection between the negative connection section and the top cover.

[0016] In some embodiments of the present application, the negative connection section has a plug-in portion, and the housing has a mating portion. The plug-in portion and the mating portion are in plug-in fit to electrically connect the negative connection section to the housing.

[0017] A second aspect of the present application provides a battery, including a box body and the battery cell according to any one of the first aspect, and the battery cell is arranged in the box body.

[0018] The battery provided by the present application, since it includes the battery cell provided in any one of the first aspect, thus has the same technical effects. That is, it can improve the reliability when the tab in the battery cell is electrically connected to the current collector plate.

[0019] A third aspect of the present application provides an electrical device, including an electrical appliance and the battery according to the second aspect, and the battery is electrically connected to the electrical appliance.

[0020] The electrical device provided by the present application, since it includes the battery provided in the second aspect, thus has the same technical effects. That is, it can improve the reliability when the tab in the battery cell is electrically connected to the current collector plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 is a schematic structural view of the battery cell provided by the embodiment of the present application;

[0023] Figure 2 is a schematic structural view of the current collector assembly in the battery cell provided by the embodiment of the present application;

[0024] Figure 3 is Figure 1 a cross-sectional view taken along line A-A in

[0025] Figure 4 is Figure 3 an enlarged view of B in

[0026] Figure 5 Explosion view of the current collector assembly in the battery cell provided by the embodiment of the present application;

[0027] Figure 6 Schematic diagram of the state before the tab is electrically connected to the connection part provided by the embodiment of the present application;

[0028] Figure 7 is Figure 6 Enlarged view of part C in

[0029] Figure 8 is Figure 3 Enlarged view of part D in

[0030] Figure 9 is Figure 3 Enlarged view of part E in

[0031] Figure 10 is Figure 5 Schematic diagram of the structure of the insulating support in

[0032] Figure 11 is Figure 5 Schematic diagram of the structure of the positive current collector plate in

[0033] Figure 12 is Figure 5 Schematic diagram of the structure of the negative current collector plate in

[0034] Figure 13 Schematic diagram of the structure of the housing in the battery cell provided by the embodiment of the present application.

[0035] Explanation of reference numerals:

[0036] 1 - Housing; 11 - Installation cavity; 12 - Adaptation part; 2 - Electrode structure; 21 - Tab; 21a - Positive tab; 21b - Negative tab; 211 - Tab unit; 22 - Electrode tab; 3 - Current collector assembly; 31 - Current collector plate; 31a - Positive current collector plate; 31a1 - Positive connection section; 31b - Negative current collector plate; 31b1 - Negative connection section; 31b2 - Insertion part; 311 - Through hole; 312 - Main body part; 313 - Connection part; 32 - Insulating support; 321 - Avoidance structure; 322 - First support surface; 323 - Second support surface; 324 - Central hole; 4 - Top cover; 5 - Terminal post. Detailed implementation manners

[0037] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is merely a description of the associated relationship of associated objects, indicating that three relationships can exist, for example, A and / or B, which can represent: the sole existence of A, the simultaneous existence of A and B, and the sole existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0042] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0045] Below, this application is described in detail.

[0046] Battery monomers are increasingly used in life and industry. Battery monomers are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of the application field of battery monomers, the market demand is also constantly expanding.

[0047] A battery cell usually includes a pole lug and a current collecting plate. When processing a battery cell, the pole lug and the current collecting plate need to be welded to conduct the current inside the battery cell. In the related art, before welding the pole lug and the current collecting plate, the pole lug needs to be flattened or smoothed first, and then the pole lug and the current collecting plate are welded. However, the welding area between the pole lug and the current collecting plate is located at the bottom of the current collecting plate. Therefore, it is difficult to detect the welding reliability after the welding of the pole lug and the current collecting plate is completed. In this way, when cold welding, leaking welding, etc. occur, it is easy to cause problems such as increased DC internal resistance at the electrical connection between the pole lug and the current collecting plate, insufficient current carrying capacity, and increased heat generation.

[0048] The inventor of the present application noticed that after the electrode tab 21 and the current collecting plate 31 are welded, the welding position of the electrode tab 21 and the current collecting plate 31 is in an invisible state, which increases the difficulty of detecting the welding reliability. The inventor of the present application found through research that by designing the structure of the current collecting plate 31 so that the welding position of the electrode tab 21 and the current collecting plate 31 is in a visible state, the difficulty of detecting the welding reliability can be reduced, thereby reducing the probability of cold welding and leaking welding between the electrode tab 21 and the current collecting plate 31, thereby improving the reliability of the electrical connection between the electrode tab 21 and the current collecting plate 31.

[0049] Based on such a design concept, the inventors of the present application designed a battery cell. Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the battery cell includes a housing 1, an electrode structure 2 and a current collector assembly 3. The interior of the housing 1 has an installation cavity 11; the electrode structure 2 is disposed in the installation cavity 11, and the electrode structure 2 includes a pole piece 22 and a tab 21; the current collector assembly 3 is disposed on the housing 1, and the current collector assembly 3 includes a current collector plate 31. A through hole 311 for the tab 21 to pass through is provided on the current collector plate 31. The first end of the tab 21 is electrically connected to the pole piece 22, and the second end of the tab 21 is electrically connected to the current collector plate 31.

[0050] In the embodiment of the present application, the function of the housing 1 is to protect the battery cell from physical impact, chemical corrosion or other external environments. Therefore, the shape of the housing 1 has various possibilities. For example, the housing 1 can be cylindrical, can be square, or can also be an irregular shape. The embodiment of the present application does not limit this.

[0051] In the embodiment of the present application, the pole piece 22 is one of the core components of the battery cell. The pole piece 22 is composed of a positive electrode material, a negative electrode material, a separator, a conductive agent, etc. During the charging and discharging process of the battery cell, lithium ions move back and forth between the positive and negative electrodes, and the pole piece 22 plays a role in storing and releasing electrical energy.

[0052] In the embodiment of the present application, the function of the current collector plate 31 is to conduct the current between the pole piece 22 inside the battery cell and the external terminal 5. Therefore, the structural design of the current collector plate 31 has various possibilities. For example, the current collector plate 31 can be a circular current collector plate 31, can also be a cylindrical current collector plate 31, or can also be a multi-plate current collector plate 31. The embodiment of the present application does not limit this.

[0053] The battery cell provided by the embodiment of the present application includes a housing 1, an electrode structure 2, and a current collecting component 3. An installation cavity 11 is provided inside the housing 1, and the installation cavity 11 can provide an installation space for the electrode structure 2; the electrode structure 2 includes a pole piece 22 and a pole tab 21, and the pole piece 22 is electrically connected to the current collecting component 3 through the pole tab 21 to conduct the current between the pole piece 22 inside the battery cell and the external pole column 5; the current collecting component 3 is arranged on the housing 1, and the current collecting component 3 includes a current collecting plate 31, and a through hole 311 for the pole tab 21 to pass through is provided on the current collecting plate 31. Here, when the pole tab 21 is electrically connected to the current collecting plate 31, the first end of the pole tab 21 is electrically connected to the pole piece 22, and the second end of the pole tab 21 can pass through the through hole 311 and be electrically connected to the side of the current collecting plate 31 facing away from the pole piece 22. In this way, the electrical connection position between the pole tab 21 and the current collecting plate 31 is in a visible state, which is convenient for detecting the reliability of the connection between the pole tab 21 and the current collecting plate 31. Through detection, the probability of virtual soldering and missed soldering between the pole tab 21 and the current collecting plate 31 can be reduced; the second end of the pole tab 21 may also not pass through the through hole 311, and the second end of the pole tab 21 can be electrically connected to the side of the current collecting plate 31 close to the pole piece 22. At this time, the reliability of the connection between the pole tab 21 and the current collecting plate 31 can be detected through the through hole 311, and the probability of virtual soldering and missed soldering between the pole tab 21 and the current collecting plate 31 can also be reduced. In summary, the battery cell provided by the embodiment of the present application can improve the reliability of the electrical connection between the pole tab 21 and the current collecting plate 31.

[0054] In the embodiment of the present application, the second end of the pole tab 21 passes through the through hole 311 and is electrically connected to the side of the current collecting plate 31 facing away from the pole piece 22. Here, the second end of the pole tab 21 can be directly electrically connected to the side of the current collecting plate 31 facing away from the pole piece 22; or, a connecting piece can be provided on the side of the current collecting plate 31 facing away from the pole piece 22, and the second end of the pole tab 21 is electrically connected to the side of the current collecting plate 31 facing away from the pole piece 22 through the connecting piece. In this way, the electrical connection position between the pole tab 21 and the current collecting plate 31 is in a visible state, which is convenient for detecting the reliability of the electrical connection between the pole tab 21 and the current collecting plate 31, and reduces the probability of virtual soldering and missed soldering between the pole tab 21 and the current collecting plate 31. In addition, the second end of the pole tab 21 passes through the through hole 311 and is electrically connected to the side of the current collecting plate 31 facing away from the pole piece 22, which can avoid internal insertion when the pole tab 21 is electrically connected to the current collecting plate 31, thereby reducing the risk of short circuit of the pole tab 21 caused by internal insertion.

[0055] In the embodiment of the present application, there are various possibilities for the angle between the plane where the side of the current collecting plate 31 facing away from the pole piece 22 is located and the connecting piece. For example, the angle between the plane where the side of the current collecting plate 31 facing away from the pole piece 22 is located and the connecting piece can be 30 degrees, or 45 degrees, or 60 degrees. The embodiment of the present application does not limit this.

[0056] Refer to Figure 2 、 Figure 3 andFigure 4 , in the embodiment of the present application, the current collector plate 31 includes a main body portion 312 and a connecting portion 313. The connecting portion 313 is flexibly connected to the main body portion 312. The through hole 311 is provided on the main body portion 312. The connecting portion 313 is located in the through hole 311. One side of the connecting portion 313 facing the pole piece 22 is electrically connected to the second end of the pole ear 21. The connecting portion 313 can swing towards the side away from the pole piece 22 to expose the through hole 311. When the connecting portion 313 exposes the through hole 311, the second end of the pole ear 21 can pass through the through hole 311 to be electrically connected to the connecting portion 313.

[0057] In the embodiment of the present application, the main body portion 312 refers to the part of the current collector plate 31 that is not directly electrically connected to the second end of the pole ear 21. Therefore, the structural form of the main body portion 312 has various possibilities. For example, the main body portion 312 can be a plate-like structure, a block-like structure, or a strip-like structure. The embodiment of the present application does not limit this. In addition, the connecting portion 313 refers to the part of the current collector plate 31 that is directly electrically connected to the second end of the pole ear 21. Therefore, the structural form of the connecting portion 313 has various possibilities. For example, the main body portion 312 can be a plate-like structure, a block-like structure, or a strip-like structure. The embodiment of the present application also does not limit this.

[0058] In the embodiment of the present application, the flexible connection between the connecting portion 313 and the main body portion 312 means that the connecting portion 313 can move relative to the main body portion 312 while maintaining electrical connection under the action of an external force. Therefore, there are various possibilities for the flexible connection manner between the connecting portion 313 and the main body portion 312. For example, the connecting portion 313 can be connected to the main body portion 312 through a conductive wire. Or, the connecting portion 313 is made of a flexible material, such as a copper sheet, an aluminum sheet, etc. The connecting portion 313 moves relative to the main body portion 312 by bending itself. The embodiment of the present application does not limit this. To ensure the electrical conductivity of the current collector plate 31, the connecting portion 313 and the main body portion 312 can be made of the same material.

[0059] In the embodiment of the present application, the current collector plate 31 includes a main body portion 312 and a connecting portion 313. The main body portion 312 is electrically connected to the second end of the pole ear 21 through the connecting portion 313. The connecting portion 313 is flexibly connected to the main body portion 312. The connecting portion 313 can swing towards the side away from the pole piece 22 to expose the through hole 311. Refer to Figure 5 , Figure 6 and Figure 7, before the connecting portion 313 is electrically connected to the second end of the tab 21, the connecting portion 313 can swing towards the side away from the electrode tab 22 to expose the through hole 311. The second end of the tab 21 passes through the through hole 311 and is disposed opposite to the connecting portion 313. The second end of the tab 21 moves closer to the side where the connecting portion 313 is located to be electrically connected to the connecting portion 313. In this way, the tab 21 is in a visible state when connected to the connecting portion 313, which is convenient for detecting the reliability of the electrical connection between the tab 21 and the current collector plate 31, and reduces the probability of virtual soldering and missed soldering between the tab 21 and the current collector plate 31. In addition, there is no internal insertion when the tab 21 is electrically connected to the current collector plate 31, avoiding the risk of short circuit caused by the internal insertion of the tab 21. After the connecting portion 313 is electrically connected to the second end of the tab 21, the connecting portion 313 and the second end of the tab 21 can be swung together towards the side close to the electrode tab 22, so that the connecting portion 313 is located in the through hole 311, and the second end of the tab 21 is located on the side of the connecting portion 313 facing the electrode tab 22. In this way, the occupied space of the connecting portion 313 and the tab 21 can be reduced, thereby reducing the volume of the battery cell.

[0060] In the embodiment of the present application, the contact area between the tab 21 and the current collector plate 31 is related to the length of the second end of the tab 21 extending out of the through hole 311. That is, the longer the length of the tab 21 extending out of the through hole 311, the longer the portion of the tab 21 connected to the current collector plate 31, and thus the larger the contact area between the tab 21 and the current collector plate 31. The increase in the contact area between the tab 21 and the current collector plate 31 can improve the current-carrying capacity between the tab 21 and the current collector plate 31. However, if the length of the tab 21 extending out of the through hole 311 is too long, it will also cause redundant design, which is not conducive to the assembly of the battery cell. Therefore, when designing the length of the tab 21, both the current-carrying capacity between the tab 21 and the current collector plate 31 and redundant design should be considered. For this reason, the length of the tab 21 extending out of the through hole 311 can be 4-13 mm. Within this range, both the current-carrying capacity between the tab 21 and the current collector plate 31 can be improved, and redundant design caused by too long length of the tab 21 can be avoided.

[0061] In the embodiment of the present application, the shapes of the through hole 311 and the connecting portion 313 have various possibilities. For example, the through hole 311 can be a circular hole, a rectangular hole, or a polygonal hole, and the embodiment of the present application does not limit this. The connecting portion 313 can be a circular plate, a rectangular plate, or a plate-like structure with an irregular shape, and the embodiment of the present application does not limit this. In addition, the shapes of the through hole 311 and the connecting portion 313 can be adapted, such as the through hole 311 is a circular hole and the connecting portion 313 is a circular plate; the shapes of the through hole 311 and the connecting portion 313 can also be not adapted, such as the through hole 311 is a circular hole and the connecting portion 313 is a rectangular plate, and the embodiment of the present application does not limit this either.

[0062] In the embodiments of the present application, there are various possibilities for the connection position between the connecting portion 313 and the main body portion 312. For example, the connecting portion 313 can be flexibly connected to the side of the main body portion 312 facing the pole piece 22, or the connecting portion 313 can be flexibly connected to the side of the main body portion 312 facing away from the pole piece 22. The connecting portion 313 can also be flexibly connected to the hole wall of the through hole 311. The embodiments of the present application do not limit this.

[0063] Referring to Figure 5 and Figure 6 In the embodiments of the present application, the connecting portion 313 and the hole wall of the through hole 311 are connected through a bending portion, and the shape of the through hole 311 is adapted to the shape of the connecting portion 313, so that the connecting portion 313 can be adaptively accommodated in the through hole 311.

[0064] In the embodiments of the present application, the connecting portion 313 and the hole wall of the through hole 311 are connected through a bending portion, that is, the connecting portion 313 and the hole wall of the through hole 311 are integrally connected, and the connecting portion 313 can be bent relative to the hole wall of the through hole 311. When processing the current collector plate 31, a plate-shaped material can be selected, and the connecting portion 313 is formed while die-cutting the through hole 311 on the plate-shaped structure, which simplifies the processing procedure of the current collector plate 31. In addition, the shape of the through hole 311 is adapted to the shape of the connecting portion 313, so that the connecting portion 313 can be adaptively accommodated in the through hole 311. In this way, the connecting portion 313 can be completely accommodated in the through hole 311, further reducing the occupied space of the connecting portion 313, and thus further reducing the volume of the battery cell.

[0065] In the embodiments of the present application, the number of the pole tabs 21 has various possibilities. For example, the number of the pole tabs 21 can be one, two, three, or five. The embodiments of the present application do not limit this. It should be noted that the pole tab 21 has two polarities, positive and negative, and the number of the pole tabs 21 with different polarities can be the same or different. The embodiments of the present application do not limit this. In addition, the number of the connecting portions 313 can be the same as that of the pole tabs 21. For example, both the pole tab 21 and the connecting portion 313 are two, and the pole tab 21 and the connecting portion 313 correspond one by one; the number of the connecting portions 313 can also be different from that of the pole tabs 21. For example, the number of the connecting portions 313 is one, and the number of the pole tabs 21 is two, and the two pole tabs 21 are connected to the same connecting portion 313.

[0066] In the embodiments of the present application, the electrode structure 2 includes at least two pole tabs 21, and the current collector plate 31 includes at least two connecting portions 313. The number of the pole tabs 21 is the same as that of the connecting portions 313, so that the pole tabs 21 and the connecting portions 313 correspond one by one. In this way, the connection area between the pole tabs 21 and the connecting portions 313 can be increased, thereby improving the current-carrying capacity between the pole tabs 21 and the connecting portions 313.

[0067] In the embodiments of the present application, the tab 21 and the connecting portion 313 are usually electrically connected by welding, such as ultrasonic welding or laser welding. Therefore, the number of welds between the tab 21 and the connecting portion 313 is related to the number of tabs 21. To reduce the number of welds between the tab 21 and the connecting portion 313, the number of tabs 21 can be two, three, or four. In this way, while meeting the current flux between the tab 21 and the connecting portion 313, the number of welds between the tab 21 and the connecting portion 313 can be reduced, thereby improving the production efficiency of the battery cell.

[0068] In the embodiments of the present application, the electrode sheet 22 is wound in the installation cavity 11 to form at least two layers of electrode sheet units. At least two tabs 21 are arranged at intervals in the circumferential direction of the electrode sheet 22. In the axial direction of the electrode sheet 22, the tab 21 and the corresponding connecting portion 313 are arranged opposite to each other. Here, the tabs 21 are arranged at intervals in the circumferential direction of the electrode sheet 22, and the tab 21 and the corresponding connecting portion 313 are arranged opposite to each other in the axial direction of the electrode sheet 22. In this way, when the tab 21 is electrically connected to the connecting portion 313, the tab 21 can directly pass through the through hole 311 to be connected to the connecting portion 313, reducing the bending amount when the tab 21 is connected to the connecting portion 313, and further improving the production efficiency of the battery cell.

[0069] In the embodiments of the present application, there are various possibilities for the number of layers in which the electrode sheet 22 is wound in the installation cavity 11. For example, the electrode sheet 22 can be wound in the installation cavity 11 to form ten layers of electrode sheet units, or fifteen layers of electrode sheet units, or thirty layers of electrode sheet units. The embodiments of the present application do not limit this.

[0070] In the embodiments of the present application, before the electrode sheet 22 is wound, the electrode sheet 22 can be die-cut first to form a plurality of protrusions on one side of the electrode sheet 22. In this way, after the electrode sheet 22 is wound, the protrusions are spaced apart in the circumferential direction of the electrode sheet 22 to form a plurality of tabs 21.

[0071] Referring to Figure 6 , in the embodiments of the present application, when the tab 21 is formed by winding the protrusion on one side of the electrode sheet 22, the side of the tab 21 facing the connecting portion 313 is an arc surface. To improve the fitting effect between the tab 21 and the connecting portion 313, the side wall of the through hole 311 facing the tab 21 can be tangent to the arc surface on the side of the tab 21 facing the connecting portion 313.

[0072] In the embodiments of the present application, the tab 21 is electrically connected to at least two layers of electrode sheet units, and in at least two layers of electrode sheet units, there is at least one layer of electrode sheet unit that is electrically connected to at least two tabs 21 at the same time.

[0073] In the embodiments of the present application, there are various possibilities for the number of layers in which a single tab 21 is electrically connected to the tab unit. For example, a single tab 21 can be electrically connected to five tab units simultaneously, or can be electrically connected to twenty tab units simultaneously, or can be electrically connected to thirty tab units simultaneously. The embodiments of the present application do not limit this.

[0074] In the embodiments of the present application, in at least two layers of tab units, there is at least one layer of tab unit that is electrically connected to at least two tabs 21 simultaneously. In this way, in at least two layers of tab units, there is at least one layer of tab unit that can be electrically connected to at least two tabs 21 simultaneously, improving the over-current capacity of electrons between the tabs 21 and the tab 22, thereby improving the working performance of the battery cell.

[0075] In the embodiments of the present application, in at least two layers of tab units, there are various possibilities for the number of layers in which the tab unit is electrically connected to at least two tabs 21 simultaneously. For example, in the tab units with a total of thirty layers, one layer of tab unit can be electrically connected to at least two tabs 21 simultaneously, or ten layers of tab units can be electrically connected to at least two tabs 21 simultaneously, or thirty layers of tab units can be electrically connected to at least two tabs 21 simultaneously. The embodiments of the present application do not limit this.

[0076] In the embodiments of the present application, in at least two layers of tab units, the tab unit can be electrically connected to two tabs 21 simultaneously, or can be electrically connected to three tabs 21 simultaneously, or can be electrically connected to five tabs 21 simultaneously. The embodiments of the present application do not limit this.

[0077] In the embodiments of the present application, in the radial direction of the tab 22, the tab 21 includes at least two layers of tab units 211. The first end of the tab unit 211 is electrically connected to the tab unit, and the second end of the tab unit 211 is electrically connected to the connecting portion 313. In the direction close to the connecting portion 313, the distance between the first end and the second end on adjacent tab units 211 gradually decreases.

[0078] In the embodiments of the present application, in the radial direction of the tab 22, there are various possibilities for the number of layers of the tab units 211 in a single tab 21. For example, the number of layers of the tab units 211 in a single tab 21 can be two, or can be three, or can be ten. The embodiments of the present application do not limit this.

[0079] In the embodiment of the present application, when the tab 21 is electrically welded to the connecting portion 313, each layer of tab unit 211 in the tab 21 needs to approach the connecting portion 313. If the number of layers of the tab units 211 in a single tab 21 is large, it is not conducive to bending the tab 21. If the number of layers of the tab units 211 in a single tab 21 is small, in order to improve the over-current capacity of electrons between the tab 21 and the tabbed plate 22, the number of tabs 21 needs to be increased. In this way, the structural complexity of the electrode structure 2 will increase, which is not conducive to the production and manufacturing of the battery cell. Considering the above situation, the number of layers of the tab units 211 in a single tab 21 ranges from 5 to 30 layers. In this way, the tab 21 can have good bending performance, thereby improving the electrical connection quality between the tab 21 and the connecting portion 313, and can also improve the over-current capacity of electrons between the tab 21 and the tabbed plate 22. In this way, there is no need to additionally increase the number of tabs 21, which simplifies the structure of the electrode structure 2 and is conducive to the production and manufacturing of the battery cell.

[0080] In the embodiment of the present application, the distance between the first end and the second end of the tab unit 211 refers to the distance between the first end and the second end of the tab unit 211 in a straight state. Since the side of the tabbed plate 22 facing the tab 21 is on the same horizontal plane, when the tab 21 passes through the through hole 311, in the direction close to the connecting portion 313, the height of adjacent tab units 211 gradually decreases. When the tab unit 211 approaches the connecting portion 313, the closer the distance to the connecting portion 313, the smaller the bending radius of the tab unit 211. Therefore, in the direction close to the connecting portion 313, the height of adjacent tab units 211 gradually decreases, which can reduce the height difference of the second ends of the tab units 211 after approaching the connecting portion 313, thereby facilitating the welding of the tab 21 and bending the tab 21 after welding.

[0081] In the embodiment of the present application, after the tab 21 is electrically connected to the connecting portion 313, the second ends of the tab units 211 can be absolutely flush with each other, or the height difference can be controlled within a small range. For example, the height difference between the second ends of the tab units 211 is less than 0.2 mm. The embodiment of the present application does not limit this.

[0082] In the embodiment of the present application, the current collector plate 31 includes a positive current collector plate 31a and a negative current collector plate 31b. There are various possibilities for the arrangement positions of the positive current collector plate 31a and the negative current collector plate 31b. For example, the positive current collector plate 31a and the negative current collector plate 31b can be arranged on the same end face of the housing 1, or can be arranged on different end faces of the housing 1. The embodiment of the present application does not limit this.

[0083] In the embodiment of the present application, the current collector plate 31 includes a positive current collector plate 31a and a negative current collector plate 31b. The positive current collector plate 31a and the negative current collector plate 31b are arranged on the same end face of the housing 1. The tab 21 includes a positive tab 21a and a negative tab 21b. The positive tab 21a is electrically connected to the positive current collector plate 31a, and the negative tab 21b is electrically connected to the negative current collector plate 31b.

[0084] In the embodiment of the present application, the current collector plate 31 includes a positive current collector plate 31a and a negative current collector plate 31b. The positive current collector plate 31a and the negative current collector plate 31b are arranged on the same end face of the housing 1. The tab 21 includes a positive tab 21a and a negative tab 21b. The positive tab 21a is electrically connected to the positive current collector plate 31a, and the negative tab 21b is electrically connected to the negative current collector plate 31b. Here, the positive current collector plate 31a and the negative current collector plate 31b are arranged on the same end face of the housing 1, which can reduce the volume of the battery cell, thereby improving the energy density of the battery cell. The positive tab 21a is electrically connected to the positive current collector plate 31a to direct the current on the positive electrode plate 22 to the positive current collector plate 31a, and the negative tab 21b is electrically connected to the negative current collector plate 31b to direct the current on the negative electrode plate 22 to the negative current collector plate 31b, so that the battery cell can work normally.

[0085] In the embodiment of the present application, the battery cell includes a top cover 4 and a terminal post 5. The top cover 4 is arranged on the housing 1, and the top cover 4 is located on the side of the current collector assembly 3 facing away from the electrode structure 2. The terminal post 5 is arranged on the top cover 4. The positive current collector plate 31a has a positive connection section 31a1, and the positive connection section 31a1 is electrically connected to the terminal post 5. The negative current collector plate 31b has a negative connection section 31b1, and the negative connection section 31b1 is electrically connected to the top cover 4 and the housing 1 respectively.

[0086] In the embodiment of the present application, the positive current collector plate 31a has a positive connection section 31a1, and the positive connection section 31a1 is electrically connected to the terminal post 5, so that the terminal post 5 forms the positive electrode of the battery cell; the negative current collector plate 31b has a negative connection section 31b1, and the negative connection section 31b1 is electrically connected to the top cover 4 and the housing 1 respectively, so that the top cover 4 and the housing 1 form the negative electrode of the battery cell.

[0087] Refer to Figure 9 、 Figure 10 and Figure 11, in the embodiment of the present application, the current collector assembly further includes an insulating support 32. The positive current collector plate 31a and the negative current collector plate 31b are both arranged on the insulating support 32. The positive current collector plate 31a and the negative current collector plate 31b are insulated from each other. The insulating support 32 is provided with an avoidance structure 321 for the pole ear 21 to pass through. And the insulating support 32 has a first support surface 322 and a second support surface 323. The positive connection section 31a1 is arranged on the first support surface 322. The first support surface 322 protrudes towards the pole column 5 to support the electrical connection between the positive connection section 31a1 and the pole column 5. The negative connection section 31b1 is arranged on the second support surface 323. The second support surface 323 protrudes towards the top cover 4 to support the electrical connection between the negative connection section 31b1 and the top cover 4.

[0088] In the embodiment of the present application, there are various possibilities for the way the positive current collector plate 31a and the negative current collector plate 31b are arranged on the insulating support 32. For example, the positive current collector plate 31a and the negative current collector plate 31b can be clamped and fixed on the insulating support 32, or can be adhesively fixed on the insulating support 32; or, the insulating support 32 is integrally connected with the positive current collector plate 31a and the negative current collector plate 31b by injection molding. The embodiment of the present application does not limit this.

[0089] In the embodiment of the present application, the function of the avoidance structure 321 is to allow the pole ear 21 to pass through. Therefore, there are various possibilities for the structural form of the avoidance structure 321. For example, the avoidance structure 321 can be an avoidance hole or an avoidance notch. The embodiment of the present application does not limit this.

[0090] In the embodiment of the present application, the function of the first support surface 322 is to support the electrical connection between the positive connection section 31a1 and the pole column 5. Therefore, the first support surface 322 can be a flat surface or an arc surface. The embodiment of the present application does not limit this. In addition, the function of the second support surface 323 is to support the electrical connection between the negative connection section 31b1 and the top cover 4. Therefore, the second support surface 323 can be a flat surface or an arc surface. The embodiment of the present application also does not limit this.

[0091] In the embodiment of the present application, the positive current collector plate 31a and the negative current collector plate 31b are both arranged on the insulating support 32, so that the positive current collector plate 31a and the negative current collector plate 31b form an aggregate, which can simplify the installation process of the positive current collector plate 31a and the negative current collector plate 31b. The positive current collector plate 31a and the negative current collector plate 31b are insulated from each other, which can avoid short circuit and improve the safety during the use of the battery cell. The insulating support 32 has a first support surface 322 and a second support surface 323. The positive connection section 31a1 is arranged on the first support surface 322. Refer to Figure 8 and Figure 9, the first supporting surface 322 protrudes towards the pole column 5 to support the electrical connection between the positive electrode connection section 31a1 and the pole column 5. The negative electrode connection section 31b1 is arranged on the second supporting surface 323, and the second supporting surface 323 protrudes towards the top cover 4 to support the electrical connection between the negative electrode connection section 31b1 and the top cover 4. In this way, when the positive electrode connection section 31a1 is electrically connected to the pole column 5, the first supporting surface 322 can provide support to the positive electrode connection section 31a1 to prevent the positive electrode connection section 31a1 from deflecting towards the side away from the pole column 5, improving the reliability of the electrical connection between the positive electrode connection section 31a1 and the pole column 5; when the negative electrode connection section 31b1 is electrically connected to the top cover 4, the second supporting surface 323 can provide support to the negative electrode connection section 31b1 to prevent the negative electrode connection section 31b1 from deflecting towards the side away from the top cover 4, improving the reliability of the electrical connection between the negative electrode connection section 31b1 and the top cover 4.

[0092] Referring to Figure 10 , in the embodiment of the present application, the insulating support 32 is integrally of a cylindrical structure. In the radial direction of the insulating support 32, the first supporting surface 322 is arranged at the central position of the insulating support 32, and the second supporting surface 323 is arranged at the edge position of the insulating support 32. In the axial direction of the battery cell, the first supporting surface 322 is arranged opposite to the pole column 5, and the second supporting surface 323 is arranged opposite to the edge of the top cover 4.

[0093] In the embodiment of the present application, while the positive electrode connection section 31a1 is in contact with the pole column 5, it also needs to be welded to the pole column 5. For this purpose, referring to Figure 10 , a central hole 324 for the welding needle to pass through is provided on the first supporting surface 322. When the positive electrode connection section 31a1 is welded to the pole column 5, the welding needle passes through the central hole 324 from the end of the pole piece 22 facing away from the pole ear 21 to press the positive electrode connection section 31a1 against the pole column 5 for welding. The negative electrode connection section 31b1 needs to be welded to the top cover 4 and the housing 1 while being in contact with the top cover 4 and the housing 1. To increase the welding path between the negative electrode connection section 31b1, the top cover 4 and the housing 1, and to improve the current-carrying capacity between the negative electrode connection section 31b1, the top cover 4 and the housing 1, the negative electrode connection section 31b1 can be thickened. When thickening the negative electrode connection section 31b1, it can be achieved by welding a sheet of a certain thickness on the surface of the negative electrode connection section 31b1. To ensure the electrical conductivity of the negative electrode connection section 31b1, the sheet can be made of the same material as the negative electrode connection section 31b1.

[0094] Referring to Figure 10 , in the embodiment of the present application, the first supporting surface 322 can be a circular plane, and the central hole 324, the first supporting surface 322 and the pole column 5 can be coaxially arranged. In this way, it is convenient to align the first supporting surface 322 with the pole column 5 in the axial direction of the battery cell, thereby improving the assembly accuracy.

[0095] In the embodiment of the present application, there are many possible ways of matching the negative electrode connecting segment 31b1 with the shell 1. For example, the negative electrode connecting segment 31b1 can abut against the inner wall surface of the shell 1; or, the negative electrode connecting segment 31b1 can also overlap the end surface of the shell 1, which is not limited in the embodiment of the present application.

[0096] Reference Figure 12 and Figure 13 In the embodiment of the present application, the negative electrode connecting segment 31b1 has a plug-in portion 31b2, and the shell 1 has an adapter portion 12. The plug-in portion 31b2 is plugged into and matched with the adapter portion 12 to electrically connect the negative electrode connecting segment 31b1 to the shell 1.

[0097] In the embodiment of the present application, the plug-in portion 31b2 has a variety of possible shapes, for example, the plug-in portion 31b2 can be a block structure, a sheet structure, or a columnar structure, which is not limited in the embodiment of the present application. It should be noted that the adapter portion 12 needs to match the shape of the plug-in portion 31b2, for example, when the plug-in portion 31b2 is a plug-in sheet, the adapter portion 12 can be a plug-in slot.

[0098] In the embodiment of the present application, the negative electrode connecting segment 31b1 and the shell 1 are plugged into each other through the plug-in portion 31b2 and the adapter portion 12. On the one hand, the connection reliability between the negative electrode connecting segment 31b1 and the shell 1 can be increased. On the other hand, relative movement between the negative electrode connecting segment 31b1 and the shell 1 can be prevented during assembly, thereby improving the assembly accuracy of the battery cell.

[0099] In the embodiment of the present application, the side of the negative electrode connection section 31b1 facing the inner wall of the shell 1 is a first arc-shaped edge, and the diameter corresponding to the first arc-shaped edge is the same as the inner diameter of the shell 1, that is, the first arc-shaped edge can be completely fitted with the inner wall of the shell 1. This further improves the reliability of the negative electrode connection section 31b1 when it is matched with the shell 1. In addition, the side of the plug-in portion 31b2 away from the central axis of the shell 1 is a second arc-shaped edge, and the diameter corresponding to the second arc-shaped edge is the same as the outer diameter of the shell 1, that is, when the plug-in portion 31b2 is plugged and matched with the adapter portion 12, it will not protrude from the shell 1 in the radial direction of the shell 1.

[0100] In the embodiment of the present application, when the insulating support 32 is integrally connected with the positive current collector 31a and the negative current collector 31b by injection molding, it is necessary to avoid the impact of the installation of the current collector 31 in the injection molding area. For example, in order to enable the plug-in portion 31b2 on the negative connection segment 31b1 to be plugged and matched with the adapter 12 on the housing 1, the injection molding area at the negative connection segment 31b1 should not exceed the edge of the plug-in portion 31b2. In order to avoid the injection molding area blocking the center hole 324 on the first support surface 322, the injection molding area can be set away from the area where the first support surface 322 is located.

[0101] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so that the active material can be reused. The battery cell may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0102] On this basis, the embodiments of the present application further provide a battery, which includes a box body and battery cells, and the battery cells are installed in the box body.

[0103] In the embodiments of the present application, the number of battery cells in the box body has multiple possibilities. For example, the number of battery cells in the box body can be five, ten, or twenty. The embodiments of the present application do not limit this.

[0104] The battery provided by the embodiments of the present application, because it includes the battery cells of the embodiments of the present application, therefore, the battery has the same technical effect as the battery unit. That is, it can improve the reliability when the tab 21 in the battery cell is electrically connected to the current collector plate 31.

[0105] In addition, the embodiments of the present application further provide an electrical device, which includes an electrical appliance and a battery, and the battery is electrically connected to the electrical appliance.

[0106] In the embodiments of the present application, the electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0107] In the embodiments of the present application, the electrical device may be an electric vehicle, the electrical appliance may be a drive motor, a control component, an in-vehicle air conditioner, an in-vehicle entertainment system, etc. in the electric vehicle, and the battery may be arranged at the bottom side of the vehicle body.

[0108] The electrical device provided by the embodiments of the present application, because it includes the battery of the embodiments of the present application, therefore, the electrical device has the same technical effect as the battery. That is, it can improve the reliability when the tab 21 in the battery cell is electrically connected to the current collector plate 31.

[0109] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing, wherein the housing has a mounting cavity therein; An electrode structure, arranged in the mounting cavity, the electrode structure comprising a pole piece and a pole ear; A current collecting assembly is arranged on the shell, and the current collecting assembly includes a current collecting plate, and the current collecting plate is provided with a through hole for the pole ear to pass through, the first end of the pole ear is electrically connected to the pole piece, and the second end of the pole ear is electrically connected to the current collecting plate.

2. The battery cell according to claim 1, characterized in that: The second end of the pole ear passes through the through hole and is electrically connected to a side of the current collecting disk facing away from the pole piece.

3. The battery cell according to claim 1, characterized in that: The current collecting plate comprises a main body and a connecting part, the connecting part is flexibly connected to the main body, the through hole is provided on the main body, the connecting part is located in the through hole, and a side of the connecting part facing the pole piece is electrically connected to the second end of the pole ear; The connecting portion can be swung toward a side facing away from the pole piece to expose the through hole; when the connecting portion exposes the through hole, the second end of the pole ear can pass through the through hole to be electrically connected to the connecting portion.

4. The battery cell according to claim 3, characterized in that: The connecting portion is connected to the hole wall of the through hole via a bending portion, and the shape of the through hole is adapted to the shape of the connecting portion, so that the connecting portion can be adapted to be accommodated in the through hole.

5. The battery cell according to claim 3, characterized in that: The electrode structure includes at least two electrode tabs, the current collecting plate includes at least two connecting portions, and the number of the electrode tabs is the same as the number of the connecting portions, so that the electrode tabs correspond to the connecting portions one by one.

6. The battery cell according to claim 5, characterized in that: The pole piece is wound in the mounting cavity to form at least two layers of pole piece units, at least two pole ears are arranged at intervals in the circumferential direction of the pole piece, and in the axial direction of the pole piece, the pole ears are arranged opposite to the corresponding connecting parts.

7. The battery cell according to claim 6, characterized in that: The pole tabs are electrically connected to at least two layers of the pole piece units, and among the at least two layers of the pole piece units, at least one layer of the pole piece units is electrically connected to at least two pole tabs at the same time.

8. The battery cell according to claim 7, characterized in that: In the radial direction of the pole piece, the pole ear includes at least two layers of pole ear units, the first end of the pole ear unit is electrically connected to the pole piece unit, and the second end of the pole ear unit is electrically connected to the connecting portion, and in the direction approaching the connecting portion, the distance between the first end and the second end on adjacent pole ear units gradually decreases.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The current collecting plate includes a positive current collecting plate and a negative current collecting plate, and the positive current collecting plate and the negative current collecting plate are arranged on the same end surface of the shell. The pole tab includes a positive pole tab and a negative pole tab, and the positive pole tab is electrically connected to the positive current collecting plate, and the negative pole tab is electrically connected to the negative current collecting plate.

10. The battery cell according to claim 9, characterized in that: The battery cell includes a top cover and a pole, wherein the top cover is arranged on the shell and is located on a side of the current collecting assembly facing away from the electrode structure, the pole is arranged on the top cover, the positive current collecting disc has a positive connecting section, the positive connecting section is electrically connected to the pole, and the negative current collecting disc has a negative connecting section, the negative connecting section is electrically connected to the top cover and the shell respectively.

11. The battery cell according to claim 10, characterized in that: The current collecting assembly also includes an insulating support, the positive current collecting disc and the negative current collecting disc are both arranged on the insulating support, the positive current collecting disc and the negative current collecting disc are insulated from each other, the insulating support is provided with an avoidance structure for the pole ear to pass through, and the insulating support has a first supporting surface and a second supporting surface, the positive connecting section is arranged on the first supporting surface, the first supporting surface is protruded toward the pole column to support the positive connecting section to be electrically connected to the pole column, the negative connecting section is arranged on the second supporting surface, the second supporting surface is protruded toward the top cover to support the negative connecting section to be electrically connected to the top cover.

12. The battery cell according to claim 10, characterized in that: The negative electrode connecting section is provided with a plug-in portion, and the shell is provided with an adapter portion, and the plug-in portion is plug-fitted with the adapter portion so that the negative electrode connecting section is electrically connected to the shell.

13. A battery, characterized in that: include: Box; The battery cell according to any one of claims 1 to 12, wherein the battery cell is arranged in the box.

14. An electrical device, characterized in that: include: Electrical appliances; The battery according to claim 13, wherein the battery is electrically connected to the electrical appliance.

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