Battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery and an electric device. Wherein the battery comprises a shell, an electrode assembly and a first current collector, the electrode assembly is accommodated in the shell, the electrode assembly comprises a wound first pole piece, the first pole piece comprises a main body part and a first tab part, at least the first tab part comprises a conductive layer and an insulating layer, and the conductive layer is arranged along the thickness direction of the first tab part; conductive layers are arranged on the two opposite surfaces of the insulating layer, the first current collector is arranged on the end face of the electrode assembly and abuts against the first tab part, and the first current collector is fixedly connected with the shell. The first current collecting piece is pressed against the first tab part and is fixedly connected to the shell, so that the first current collecting piece can be tightly connected with the first tab part, and the energy density of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and an electrical device. Background Art

[0002] In the existing production and processing of batteries, it is necessary to assemble the battery cells into a shell. However, the energy density of the electrode structure of the existing traditional battery cells is low, and the structural stability of the battery cells assembled into the shell is poor, resulting in poor charging and discharging effects of the battery. Therefore, there is an urgent need for a technical solution that can take into account both improving the energy density of the battery cells and improving the structural stability of the battery cells in the shell. Utility Model Content

[0003] The utility model aims to provide a battery and an electrical device, aiming to solve the technical problems of poor electrical connection effect and assembly stability between existing battery cells and shells.

[0004] In the first aspect, the present application provides a battery, comprising a shell, an electrode assembly and a first current collector, the electrode assembly being accommodated in the shell, the electrode assembly comprising a first pole sheet arranged in a wound manner, the first pole sheet comprising a main body and a first pole ear portion connected to the main body, at least the first pole ear portion of the main body and the first pole ear portion comprising a conductive layer and an insulating layer, along the thickness direction of the first pole ear portion, the conductive layer is provided on two oppositely arranged surfaces of the insulating layer, the first current collector is arranged on the end face of the electrode assembly and presses against the first pole ear portion, and the first current collector is fixedly connected to the shell.

[0005] Optionally, the main body portion and the first pole ear portion of the first pole piece both include a conductive layer and an insulating layer, and along the thickness direction of the main body portion, the conductive layer is provided on two oppositely disposed surfaces of the insulating layer.

[0006] Optionally, the first current collecting member includes a current collecting portion and a connecting portion arranged at an edge of the current collecting portion, the connecting portion extends along the axial direction of the electrode assembly and is fixedly connected to the shell, and the current collecting portion presses against the first pole ear portion.

[0007] Optionally, the connecting portion is arranged on a side of the collecting portion close to the electrode assembly, and there is a gap between the shell and the electrode assembly in a direction perpendicular to the axial direction, the connecting portion extends into the gap and fits with the inner wall of the shell; and / or, the collecting portion is provided with reinforcing ribs on at least one side in the axial direction to enhance the structural strength of the collecting portion.

[0008] Optionally, a groove is formed on the outer circumference of the shell corresponding to the connecting portion, and the shell is welded and fixed to the connecting portion through the groove to further improve the connection stability between the first current collecting member and the shell, so that the first current collecting member is firmly connected to the shell.

[0009] Optionally, the battery further includes an end cover and a limiter, wherein the end cover is sealingly connected to one end of the shell close to the first current collector, and the limiter is arranged on a surface of the first current collector facing away from the electrode assembly, and the limiter abuts against the end cover and the first current collector.

[0010] Optionally, the limiting member includes a limiting body and a first boss, the first boss is arranged on a surface of the limiting body away from the first current collecting member, the first boss is located in the middle of the limiting body and abuts against the end cover.

[0011] Optionally, the limiting member is provided with at least one through hole, and the through hole passes through two opposite sides of the limiting member in the thickness direction thereof, and the through hole can facilitate the circulation and infiltration of the electrolyte.

[0012] Optionally, the battery further comprises an end cover, wherein the end cover is sealingly connected to an end of the shell close to the first current collecting member, and the end cover abuts against the first current collecting member.

[0013] Optionally, the end cover includes a cover body and a second boss, the cover body is sealed to the shell, the second boss is arranged on the surface of the cover body facing the first current collecting part, the second boss is located in the middle of the cover body and abuts against the first current collecting part.

[0014] In a second aspect, the present application provides an electrical device comprising the above-mentioned battery.

[0015] The battery and the power device provided by the utility model have the following beneficial effects:

[0016] In the battery described in the first aspect, the structure of the composite current collector in the first pole ear portion can reduce the amount of metal foil and improve the battery energy density. By contacting the first current collector with the metal layer on the first pole ear portion, the first current collector and the first pole ear portion can be electronically connected, so as to achieve the purpose of introducing the composite current collector into the shell to make a battery with higher energy density. The first current collector is pressed against the first pole ear portion by the first current collector, and the first current collector is fixedly connected to the shell, thereby avoiding direct welding of the first current collector and the first pole ear portion, and there is no risk of welding through the welding of the first current collector and the first pole ear portion, which will cause poor high-voltage testing of the battery, and effectively improve the yield of the battery preparation process. It can be seen that the battery of the present application effectively improves the energy density of the battery and the stability of its overall assembly.

[0017] The electrical device provided in the present application effectively improves the practicality of the electrical device because it adopts the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 One of the structural schematic diagrams of the battery provided in the embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of the first pole ear portion provided in an embodiment of the utility model;

[0021] Figure 3 The second structural schematic diagram of the battery provided by the embodiment of the utility model;

[0022] Figure 4 The third structural diagram of the battery provided by the embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the structure of a position limiting member provided in an embodiment of the utility model;

[0024] Figure 6 The fourth structural schematic diagram of the battery provided in the embodiment of the utility model.

[0025] Among them, the reference numerals in the figure are:

[0026] 100. battery; 10. electrode assembly; 1112. first pole ear portion;

[0027] 1112a, conductive layer; 1112b, insulating layer;

[0028] T1, thickness direction of the first pole ear;

[0029] 20. First current collecting member; 21. Current collecting portion; 22. Connecting portion;

[0030] 30. Shell; 31. Groove; 40. End cover;

[0031] 41. Cover body; 42. Second boss; 50. Limiting member;

[0032] 51. Limiting body; 52. First boss; 53. Through hole. 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0035] In the description of the present invention, it should be understood that the terms "thickness direction", "axial", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The battery 100 and the electrical device in the embodiment of the utility model are now described.

[0039] Please refer to Figure 1 and Figure 2A battery 100 provided in the present application includes a shell 30, an electrode assembly 10 and a first current collector 20, the electrode assembly 10 is accommodated in the shell 30, the electrode assembly 10 includes a first pole sheet arranged in a wound manner, the first pole sheet includes a main body and a first pole ear portion 1112 connected to the main body, in both the main body and the first pole ear portion 1112, at least the first pole ear portion 1112 includes a conductive layer 1112a and an insulating layer 1112b, along the thickness direction T1 of the first pole ear portion 1112, the two oppositely arranged surfaces of the insulating layer 1112b are both provided with a conductive layer 1112a; wherein the first current collector 20 is arranged on the end surface of the electrode assembly 10 and presses against the first pole ear portion 1112, the first current collector 20 is electrically connected to the conductive layer 1112a of the first pole ear portion 1112, and the first current collector 20 is in surface contact with the conductive layer 1112a of the first pole ear portion 1112, and the first current collector 20 is fixedly connected to the shell 30.

[0040] The structure of the composite current collector in the first pole ear can reduce the amount of metal foil and improve the energy density of the battery. By contacting the first current collector with the metal layer on the first pole ear, the electronic conduction between the first current collector and the first pole ear can be achieved, so as to achieve the purpose of introducing the composite current collector into the shell to make a battery with higher energy density. The first current collector is pressed against the first pole ear by the first current collector, and the first current collector is fixedly connected to the shell, which avoids direct welding between the first current collector and the first pole ear, and there is no risk of welding through the welding of the first current collector and the first pole ear, which leads to poor high-voltage testing of the battery, and effectively improves the yield of the battery preparation process. It can be seen that the battery of the present application effectively improves the energy density of the battery and the stability of its overall assembly.

[0041] Exemplarily, in this embodiment, the thickness of the insulating layer 1112b of the first pole ear portion 1112 can be at least 1.01 to 1.2 times, 1.2 to 1.5 times or 1.5 to 1.8 times the thickness of each conductive layer 1112a, and the material of the insulating layer 1112b can be any one of urethane, polypropylene, phenolic resin, polyurethane resin, alkyd resin, amino resin, polyester resin, acrylic resin, vinyl resin, polystyrene, fluororesin, cyanate, vinyl acetate, polyamide, rubber, melamine, BT resin, ABF resin, polyimide, polyphenylene sulfide or polyethylene terephthalate.

[0042] It can be understood that the electrode assembly 10 is a component in the battery 100 where an electrochemical reaction occurs. The electrode assembly 10 includes a first pole piece, a second pole piece, and a diaphragm for electrically isolating the first pole piece and the second pole piece. The polarities of the first pole piece and the second pole piece are opposite. The first pole piece, the diaphragm, and the second pole piece are stacked in sequence, and a wound electrode assembly 10 is formed after a winding process. Among them, the first pole piece can be a positive pole piece or a negative pole piece, which is not limited here. This application is described by taking the first pole piece as a negative pole piece and the first pole ear portion 1112 as a negative pole ear.

[0043] In some embodiments, the first current collector 20 includes a current collector 21 and a connection portion 22 disposed at the edge of the current collector 21, the connection portion 22 extends along the axial direction of the electrode assembly 10, and is fixedly connected to the housing 30, the current collector 21 presses against the first pole ear portion 1112, the current collector 21 is electrically connected to the conductive layer 1112a of the first pole ear portion 1112, and the current collector 21 is in surface contact with the conductive layer 1112a of the first pole ear portion 1112. By extending the connection portion 22 along the axial direction of the electrode assembly 10, the welding position of the housing 30 and the first current collector 20 can be further away from the electrode assembly 10, which is conducive to reducing the heat transferred from the first current collector 20 to the electrode assembly 10, thereby reducing the risk of burning the electrode assembly 10.

[0044] In some embodiments, the extension length of the connection portion 22 is greater than the thickness of the collecting portion 21. Such a configuration can effectively increase the welding area between the shell 30 and the connection portion 22, thereby improving the connection strength between the two.

[0045] Those skilled in the art can obtain the current collecting part 21 and the connecting part 22 by a molding method familiar to them. For example, the current collecting part 21 can be processed by a bending process or a stamping process to form a flanging structure, and the flanging structure is the connecting part 22, which is an integrated molding. For another example, the hollow connecting part 22 can be installed at the edge of the current collecting part 21 by welding, clamping, etc., which is a split molding. This application does not specifically limit the molding method of the first current collecting part 20.

[0046] In some embodiments, the battery 100 further includes a second current collector, the first current collector 20 and the second current collector are respectively located on opposite sides of the electrode assembly 10 in the axial direction, and the second current collector is welded to the positive electrode tab. A positive electrode column is provided at one end of the housing 30 close to the second current collector, and the second current collector is also welded to the positive electrode column. In this way, the current on the electrode assembly 10 can be conducted to the positive electrode column.

[0047] The process before welding the first current collector 20 to the shell 30 specifically includes: preparing a wound electrode assembly 10 with positive and negative tabs on both sides, flattening or kneading the positive and negative tabs, and welding the second current collector to the positive tab. The side wall of the positive electrode column is encapsulated with glue, and the positive electrode column is sealed and fixed to one side of the shell 30, and the positive electrode column is insulated from the shell 30. The second current collector and the positive electrode column are fixed together by torque welding to form an electrical connection.

[0048] When the shell 30 , the positive electrode column, the second current collector and the electrode assembly 10 are assembled, the first current collector 20 is placed in the shell 30 to press against the first electrode ear portion 1112 of the electrode assembly 10 , and the first current collector 20 is welded to the inner wall of the shell 30 .

[0049] In some embodiments, the battery 100 further includes an end cap 40, the electrode assembly 10 is placed into the interior of the housing 30 from the housing opening at one end of the housing 30 close to the first current collector 20, the end cap 40 is sealed and connected to the housing opening at one end of the housing 30 close to the first current collector 20, and the end cap 40 abuts against the first current collector 20. Specifically, the end cap 40 abuts against the current collector 21, and by using the end cap 40 to press the current collector 21, the problem of the first pole ear portion 1112 rebounding can be improved, and the close contact between the first pole ear portion 1112 and the first current collector 20 is ensured.

[0050] It can be understood that, among the surfaces of the collecting portion 21 facing the end cover 40, the entire surface may abut against the end cover 40, or a portion of the surface may abut against the end cover 40, which is not limited here. Figure 6 , preferably part of the surface abuts against the end cover 40. The end cover 40 includes a cover body 41 and a second boss 42. The cover body 41 is sealed and connected to the shell 30. The second boss 42 is arranged on the surface of the cover body 41 facing the first current collector 20. The second boss 42 is located in the middle of the cover body 41 and abuts against the current collector 21. As can be seen from the above, the first current collector 20 is electrically connected to the negative electrode sheet, so the center of the end cover 40 usually has a liquid injection hole, and the middle of the current collector 21 also has a liquid hole that is through-set, and the electrolyte flows into the electrode assembly 10 through the above liquid hole. Due to the presence of the liquid hole, when the first pole ear part 1112 rebounds, the rebound amount of the middle part of the current collector 21 will be larger, so in this embodiment, the second boss 42 is arranged in the middle part of the cover body 41. In addition, by designing the end cover 40 to have an uneven thickness distribution structure with thicker middle and thinner two sides, the rebound problem of the first pole ear portion 1112 can be effectively improved while saving materials, thereby reducing production costs.

[0051] Usually, a sealing nail is sealed at the injection hole to seal the injection hole.

[0052] In some embodiments, the current collecting portion 21 is provided with reinforcing ribs on at least one side in the axial direction, wherein the number of reinforcing ribs may be multiple, and the multiple reinforcing ribs are arranged alternately or intersectingly to enhance the structural strength of the current collecting portion 21. When the multiple reinforcing ribs are located on the side of the current collecting portion 21 facing the conductive layer 1112a of the first pole ear portion 1112, the multiple reinforcing ribs in the plane area of ​​the current collecting portion 21 can increase the downward pressure of the current collecting portion 21 against the conductive layer 1112a, thereby ensuring a more stable connection between the current collecting portion 21 and the first pole ear portion 1112. Optionally, the thickness of the reinforcing ribs is not less than 0.1 mm.

[0053] In some embodiments, the main body and the first pole ear 1112 of the first pole piece may also include a conductive layer 1112a and an insulating layer 1112b. When the first pole piece is in an unfolded state, along the thickness direction of the main body, two oppositely disposed surfaces of the insulating layer 1112b are provided with a conductive layer 1112a, and along the thickness direction of the first pole ear 1112, two oppositely disposed surfaces of the insulating layer 1112b are provided with a conductive layer 1112a.

[0054] Specifically, the assembly method of the battery 100 includes: preparing a first electrode sheet of a composite current collector structure, selecting a conventional metal foil as the second electrode sheet, wherein, when the first electrode sheet is a negative electrode sheet and the second electrode sheet is a positive electrode sheet, the negative electrode sheet can be a composite copper foil and the positive electrode sheet can be a conventional aluminum foil, and when the first electrode sheet is a positive electrode sheet and the second electrode sheet is a negative electrode sheet, the positive electrode sheet can be a composite aluminum foil and the negative electrode sheet can be a conventional copper foil, then, the first electrode sheet, the diaphragm and the second electrode sheet are sequentially wound to form an electrode assembly 10, and the winding core adopts a method of producing pole ears on both sides, and at the same time, the pole ears formed by die cutting in the electrode sheet are flattened or kneaded, and a cylindrical shell 30 is selected; thereafter, if the first electrode sheet is a negative electrode sheet and the second electrode sheet is a positive electrode sheet, the second current collector (i.e., the positive current collector disk) and the positive pole ear are excited. Laser welding is used for welding, and the first current collector 20 (i.e., the negative electrode current collector disk) and the first pole ear portion 1112 (i.e., the negative electrode ear) are not welded, but the electrode assembly 10 is limited by welding the connecting portion 22 to the inner wall of the shell 30, so that the negative electrode current collector disk is pressed against the negative electrode ear and the negative electrode current collector disk and the negative electrode ear are in close contact and electronic conduction; if the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, the negative electrode current collector disk and the negative electrode ear are welded by laser welding, and the first current collector 20 (i.e., the positive electrode current collector disk) and the first pole ear portion 1112 (i.e., the positive electrode ear) are not welded, but the electrode assembly 10 is limited by welding the connecting portion 22 to the inner wall of the shell 30, so that the positive electrode current collector disk is pressed against the positive electrode ear and the positive electrode current collector disk and the positive electrode ear are in close contact and electronic conduction.

[0055] That is to say, one of the positive and negative electrode sheets of the electrode assembly 10 of the present application adopts a common current collector, and the other adopts a composite current collector, and the electrode tab of the electrode sheet adopting the composite current collector is in pressing contact with the first current collector 20, and then the first current collector 20 and the shell 30 are fixed.

[0056] Among them, the flattened area formed after the composite structure of the pole ear is flattened is relatively loose, the flattened area is not dense and has a certain compression space. Therefore, when placing the first current collector 20 in the shell 30, it is necessary to apply a certain force to make the first current collector 20 fit tightly with the flattened area of ​​the composite pole ear, so that the flattened area of ​​the composite pole ear is compressed from a loose state to become dense, and the flattening effect of the flattened area can be better. Subsequently, the connecting part 22 of the first current collector 20 is welded to the shell 30 to ensure the effective electrical connection between the first current collector 20 and the composite pole ear.

[0057] In addition, with regard to the structural design of the first current collector 20, in order to avoid rebound of the flattened area of ​​the composite structure's pole ear, which may cause the contact between the flattened area and the first current collector 20 to become loose, the thickness of the first current collector 20 should not be too thin. The thickness of the first current collector 20 is ≥0.3 mm, which can effectively improve the structural strength of the first current collector 20.

[0058] It is understandable that the connection portion 22 may extend toward the end cap 40 or toward the electrode assembly 10, which is not limited here. In this embodiment, the connection portion 22 extends toward the electrode assembly 10. Figure 3 , the connection part 22 is arranged on the side of the current collecting part 21 close to the electrode assembly 10, and the end cover 40 is seamlessly connected to the current collecting part 21. At the same time, in the direction perpendicular to the axial direction, that is, in the radial direction of the shell 30, there is a gap between the shell 30 and the electrode assembly 10. In other words, the inner diameter of the shell 30 is larger than the diameter of the electrode assembly 10. The connection part 22 extends into the gap and fits with the inner wall of the shell 30. For cylindrical batteries, generally, in the radial direction of the cylindrical battery, there is a gap between the shell 30 and the electrode assembly 10 for the expansion of the electric core. Please combine Figure 1 and Figure 3 By inserting the connecting portion 22 into the existing gap, the axial distance between the electrode assembly 10 and the end cover 40 can be shortened, thereby reducing the overall height of the battery 100, which is beneficial to improving the energy density of the battery 100.

[0059] Since the connection portion 22 occupies the gap between the electrode assembly 10 and the housing 30, and the size of the first current collector 20 meets the tight fit with the housing 30, after the first charge, the thickness of the first electrode sheet will electrochemically rebound to make the first current collector 20 and the housing 30 more tightly connected. Compared with the embodiments in which the connection portion 22 extends toward the end cap 40, on the basis of also achieving the conduction of electrons from the first current collector 20 to the first pole ear portion 1112, the embodiments in which the connection portion 22 extends toward the electrode assembly 10 can further improve the energy density of the battery 100.

[0060] By extending the connection part 22 toward the electrode assembly 10, the welding equipment can perform welding from the outside of the shell 30, that is, the welding of the connection part 22 and the shell 30 forms a molten pool in the shell 30 rather than in the connection part 22, which can effectively avoid the first current collecting part 20 being welded through.

[0061] In addition, when the connecting portion 22 is arranged on the side of the collecting portion 21 close to the electrode assembly 10 and the end cover 40 is seamlessly connected to the collecting portion 21, in order to achieve a better welding effect, a groove 31 is opened on the outer circumferential surface of the shell 30 corresponding to the connecting portion 22. The groove 31 can be formed by thinning the thickness of the area corresponding to the connecting portion 22 on the outer circumferential surface of the shell 30 in a direction perpendicular to the axial direction. The shell 30 is welded and fixed to the connecting portion 22 through the groove 31, so that the connection effect between the shell 30 and the connecting portion 22 is better, which is beneficial to improving the connection stability between the first current collector 20 and the shell 30.

[0062] In some embodiments, see Figure 4 The battery 100 further includes a stopper 50, which is disposed on the surface of the first current collector 20 away from the electrode assembly 10, and the stopper 50 is respectively in contact with the end cover 40 and the first current collector 20. When the free end of the first pole ear 1112 is flattened or kneaded, the stopper 50 can further prevent the free end of the first pole ear 1112 from rebounding, resulting in poor contact between the first pole ear 1112 and the first current collector 20.

[0063] Among them, the limiting member 50 abuts against the current collecting part 21 of the first current collecting part 20. The limiting member 50 is arranged in the gap between the end cover 40 and the current collecting part 21, which can enable the end cover 40 to press down the limiting member 50 and generate downward pressure on the current collecting part 21 after the end cover 40 is sealed with the shell mouth, thereby effectively improving the contact stability of the surface contact between the current collecting part 21 and the conductive layer 1112a of the first pole ear part 1112.

[0064] It can be understood that, among the surfaces of the limiting member 50 facing the end cover 40, the entire surface may abut against the end cover 40, or a portion of the surface may abut against the end cover 40, which is not limited here. In this embodiment, a portion of the surface abuts against the end cover 40. The limiting member 50 includes a limiting body 51 and a first boss 52, the first boss 52 is arranged on the surface of the limiting body 51 away from the first current collecting member 20, the first boss 52 has a through hole 53, the first boss 52 is located in the middle of the limiting body 51, and abuts against the end cover 40. Among them, the area where the limiting body 51 abuts against the current collecting part 21 of the first current collecting member 20 is larger than the area where the first boss 52 abuts against the end cover 40, so that the limiting member 50 can be assembled in the gap between the end cover 40 and the current collecting part 21 more flexibly and conveniently, and the safety of the overall structure of the battery can also be improved. If the free end of the flattened or flattened first pole ear 1112 rebounds, the rebound amount of the first pole ear 1112 near the center hole of the first boss 52, that is, the rebound amount of the free end of the first pole ear 1112 will be larger. Therefore, the thickness of the limiting member 50 is designed to be thick in the middle and thin on both sides. On the one hand, it can maximize the avoidance of the rebound of the free end of the first pole ear 1112. On the other hand, it can save materials, thereby reducing production costs.

[0065] In some embodiments, see Figure 5 The stopper 50 is provided with at least one through hole 53, and the through hole 53 penetrates two opposite sides of the stopper 50 in the thickness direction thereof. Specifically, a through hole 53 is provided in the middle of the surface of the first boss 52 facing the end cover 40, and the through hole 53 penetrates the surface of the stopper body 51 facing the electrode assembly 10 along the thickness direction of the stopper. When the stopper 50 has a through hole 53 at the center or the stopper 50 has a plurality of circular through holes 53 distributed at intervals, the electrolyte can flow from the through hole 53 into the electrode assembly 10, thereby effectively improving the liquid injection efficiency of the battery.

[0066] Among them, the material of the limit member 50 can be any one of carbamate, polypropylene, phenolic resin, polyurethane resin, alkyd resin, amino resin, polyester resin, acrylic resin, vinyl resin, polystyrene, fluororesin, cyanate, vinyl acetate, polyamide, rubber, melamine, BT resin, ABF resin, polyimide, polyphenylene sulfide or polyethylene terephthalate.

[0067] Optionally, the total thickness of the limiting member 50 may be 0.5 mm to 1.0 mm, and the total thickness of the limiting member 50 may be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc.

[0068] In the present application, the insulating layer is made of polymer material, which makes it difficult to achieve the welding of the first current collector 20 and the first pole ear portion 1112 by traditional laser welding, and it is difficult for the first pole ear portion 1112 to form the required molten pool, so that the traditional laser welding cannot achieve the effective electrical connection between the first current collector 20 and the first pole ear portion 1112, resulting in the inability of the current to flow from the first current collector 20 to the active material of the pole piece, affecting the charging and discharging of the battery. Therefore, in the present application, the first current collector 20 and the first pole ear portion 1112 are not welded, but the connection portion 22 of the first current collector 20 is welded to the inner wall of the shell 30 to achieve the limitation of the electrode assembly 10, thereby effectively achieving the effective electrical connection between the first current collector 20 and the first pole ear portion 1112.

[0069] Preferably, the battery 100 is a cylindrical cell, and by optimizing the assembly structure of the cylindrical cell and replacing the traditional metal current collector such as copper foil and aluminum foil with the composite current collector of the present application, the energy density of the battery 100 can be effectively improved. Among them, the full-ear structure of the electrode assembly 10 in the battery 100 can significantly reduce the AC internal resistance of the battery, and can effectively improve the power performance of the battery 100.

[0070] The present application also provides an electric device, including the aforementioned battery. The electric device may include, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, 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 car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: Housing (30); An electrode assembly (10) is accommodated in the housing (30), the electrode assembly (10) comprising a first pole piece that is wound, the first pole piece comprising a main body and a first pole ear portion (1112), at least the first pole ear portion (1112) comprising a conductive layer (1112a) and an insulating layer (1112b), and along the thickness direction of the first pole ear portion (1112), the conductive layer (1112a) is provided on two oppositely disposed surfaces of the insulating layer (1112b); The first current collector (20) is arranged on the end surface of the electrode assembly (10) and presses against the first electrode ear portion (1112), and is fixedly connected to the shell (30).

2. The battery according to claim 1, characterized in that: The first current collecting member (20) comprises a current collecting portion (21) and a connecting portion (22) arranged at the edge of the current collecting portion (21), wherein the connecting portion (22) extends along the axial direction of the electrode assembly (10) and is fixedly connected to the shell (30), and the current collecting portion (21) presses against the first pole ear portion (1112).

3. The battery according to claim 2, characterized in that: The connecting portion (22) is arranged on a side of the current collecting portion (21) close to the electrode assembly (10); in a direction perpendicular to the axial direction, there is a gap between the shell (30) and the electrode assembly (10); the connecting portion (22) extends into the gap and fits with the inner wall of the shell (30); And / or, the collecting portion (21) is provided with reinforcing ribs on at least one side in the axial direction.

4. The battery according to claim 2, characterized in that: A groove (31) is provided on the outer circumference of the shell (30) corresponding to the connecting portion (22), and the shell (30) is fixed to the connecting portion (22) by welding via the groove (31).

5. The battery according to any one of claims 1 to 4, characterized in that: It also includes an end cover (40) and a stopper (50), wherein the end cover (40) is sealedly connected to one end of the housing (30) close to the first current collector (20), and the stopper (50) is arranged on a surface of the first current collector (20) facing away from the electrode assembly (10); The limiting member (50) abuts against the end cover (40) and the first current collecting member (20).

6. The battery according to claim 5, characterized in that: The limiting member (50) comprises a limiting body (51) and a first boss (52), wherein the first boss (52) is arranged on a surface of the limiting body (51) facing away from the first current collecting member (20), and the first boss (52) is located in the middle of the limiting body (51) and abuts against the end cover (40).

7. The battery according to claim 5, characterized in that The limiting member (50) is provided with at least one through hole (53), and the through hole (53) passes through two opposite sides of the limiting member (50) in the thickness direction thereof.

8. The battery according to any one of claims 1 to 4, characterized in that: It also includes an end cover (40), the end cover (40) being sealed and connected to one end of the housing (30) close to the first current collecting member (20), and the end cover (40) being in abutment with the first current collecting member (20).

9. The battery according to claim 8, characterized in that: The end cover (40) comprises a cover body (41) and a second boss (42); the cover body (41) is sealedly connected to the shell (30); the second boss (42) is arranged on the surface of the cover body (41) facing the first current collecting member (20); the second boss (42) is located in the middle of the cover body (41) and abuts against the first current collecting member (20).

10. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 9.

Images