Battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery and electric equipment. The battery comprises a shell, an electrode assembly, a first conductive piece and a second conductive piece, the first conductive piece and the second conductive piece are electrically connected with each other, the electrode assembly is contained in the shell, a first tab layer is arranged on one side of the electrode assembly, and the first tab layer comprises a plurality of first tabs which are sequentially arranged in a stacked mode in the thickness direction of the electrode assembly; the free ends of at least part of the first tabs are distributed in a stepped mode, the first conductive part and the second conductive part are arranged on the two opposite sides of the first tab layer respectively and used for jointly clamping the first tab layer, the first tabs comprise first conductive layers and second conductive layers, and the first conductive layers and the second conductive layers are arranged in an electrical isolation mode in the thickness direction. The first conductive layers are located on the sides, away from the second conductive pieces, of the second conductive layers, and in the multiple first tabs with the free ends distributed in a stepped mode, at least two adjacent first conductive layers make contact with the first conductive pieces so as to form electric connection. Therefore, the current output capability 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 electrical equipment. Background Art

[0002] A composite current collector is a new type of current collector that uses a polymer layer as a substrate and deposits metal layers on both sides of the substrate. The use of composite current collectors in batteries can reduce the amount of metal layer and thus reduce the weight of the current collector, thereby increasing energy density. However, due to the presence of the intermediate polymer layer, electrons are usually unable to be transmitted from one side of the composite current collector to the other side along the thickness direction, that is, electronic conduction cannot be achieved between the metal layers on both sides of the composite current collector, affecting the rate performance of the electrode assembly. For soft-pack batteries, it is usually necessary to weld all the same polarity tabs together with an additional metal sheet, using the metal sheet as an external circuit connection. However, since it is difficult for the polymer layer to form a molten pool, it is difficult to connect the composite current collector tabs and metal sheets with different layers through traditional ultrasonic welding, resulting in a low current output capacity of the battery. Utility Model Content

[0003] The utility model aims to provide a battery and an electrical device, aiming to solve the technical problem of low current output capacity of existing batteries.

[0004] In a first aspect, the present application provides a battery, comprising a shell, an electrode assembly, and a first conductive member and a second conductive member electrically connected to each other, the electrode assembly being accommodated in the shell, a first pole lug layer being arranged on one side of the electrode assembly, the first pole lug layer comprising a plurality of first pole lugs sequentially stacked in a thickness direction of the electrode assembly, the free ends of at least some of the first pole lugs being arranged in a stepped manner, the first conductive member and the second conductive member being respectively arranged on opposite sides of the first pole lug layer for jointly clamping the first pole lug layer, wherein the first pole lug comprises a first conductive layer and a second conductive layer electrically isolated in a thickness direction, the first conductive layer being located on a side of the second conductive layer away from the second conductive member, and among the plurality of first pole lugs whose free ends are arranged in a stepped manner, at least two adjacent first conductive layers are in contact with the first conductive member to form an electrical connection.

[0005] The battery provided by the utility model has the following beneficial effects: first, after the metal sheet and the multi-layered pole lug are connected by welding, a cold weld is easily formed between the metal sheet and the pole lug, which results in an inability to form an effective electrical connection between the two. However, the present application adopts the first conductive member and the second conductive member to jointly clamp the first pole lug layer, which can avoid the cold weld between the conductive member and the first pole lug, thereby enabling an effective electrical connection to be formed between the two, and effectively improving the current capacity of the present battery. It is not difficult to understand that the conductive member of the present application is the metal sheet in the prior art.

[0006] Secondly, the free ends of at least some of the first tabs of the present application are configured to be stepped, and among these first tabs, at least two adjacent first conductive layers are in contact with the first conductive member. For the convenience of description and understanding, the first tab of the first layer and the first tab of the second layer are used for illustration. The first conductive layer of the first tab of the first layer and the first conductive layer of the first tab of the second layer are two adjacent first conductive layers, and both are in contact with the first conductive member to form an electrical connection. During the charging and discharging process of the battery, since the first conductive layer of the first tab of the second layer is in contact with the second conductive layer of the first tab of the first layer, the current can flow to the second conductive layer of the first tab of the first layer. That is to say, the second conductive layer of the first tab of the first layer and the first conductive layer of the first tab of the second layer can be electrically connected to each other, and the first conductive layer of the first tab of the first layer and the second conductive layer of the first tab of the first layer can be electrically connected to each other. Compared with the prior art, the battery of the present application has at least one first tab in which two-sided conductive layers can be electrically connected to each other, and the first tab can also be electrically connected to another adjacent first tab, effectively improving the over-current capacity and rate performance of the battery.

[0007] In summary, through the above two improvements, the present application realizes an effective electrical connection among the first tab, the first conductive member, and the second conductive member, effectively improving the over-current capacity of the battery, thereby improving the current output capacity of the battery.

[0008] Optionally, the free ends of all the first tabs are stepped, and the first conductive layers of all the first tabs are in contact with the first conductive member.

[0009] Optionally, a second tab layer is further included and is clamped between the first conductive member and the second conductive member. The second tab layer is located on the side of the first tab layer close to the second conductive member. The second tab layer includes a plurality of second tabs arranged in a stacked manner along the thickness direction. Each second tab includes a first conductive layer and a second conductive layer that are electrically isolated along the thickness direction. The free ends of at least some of the second tabs are stepped. Along the same direction, the change trend of the free end of the first tab layer is opposite to that of the free end of the second tab layer. Among the plurality of second tabs with stepped free ends, at least two adjacent second conductive layers are in contact with the second conductive member to form an electrical connection.

[0010] Optionally, the free ends of all the second tabs are stepped, and the second conductive layers of all the second tabs are in contact with the second conductive member.

[0011] Optionally, a first inclined surface is provided on the surface of the first conductive member close to the first tab layer, and the first inclined surface fits the stepped surface of the first tab layer.

[0012] Optionally, when the battery has a second tab layer, a second inclined surface is provided on the surface of the second conductive member close to the second tab layer, and the second inclined surface fits the stepped surface of the second tab layer.

[0013] Optionally, among the plurality of the first tabs that are stepped at the free ends, the length difference between adjacent two layers of the first tabs on one side in the length direction of the electrode assembly is 1-3 mm.

[0014] Optionally, among the plurality of the first tabs that are stepped at the free ends, the width difference between adjacent two layers of the first tabs on one side in the width direction of the electrode assembly is 1-3 mm.

[0015] Optionally, the first conductive member is welded to the first tab that is the farthest from the second conductive member to form a first welding portion, and the first welding portion is located on the first conductive member and extends into the corresponding first tab.

[0016] Optionally, when the battery has a second tab layer, the second conductive member is welded to the second tab that is the farthest from the first conductive member to form a second welding portion, and the second welding portion is located on the second conductive member and extends into the corresponding second tab.

[0017] Optionally, the first conductive member and the second conductive member are integrally formed.

[0018] Optionally, both the first conductive member and the second conductive member have elasticity.

[0019] Optionally, the first tab further includes an insulating layer, and the insulating layer is disposed between the first conductive layer and the second conductive layer.

[0020] Optionally, when the battery has a second tab layer, the second tab further includes an insulating layer, and the insulating layer is located between the first conductive layer and the second conductive layer.

[0021] In a second aspect, the present application provides an electrical device, including the battery described above. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the electrode assembly provided by the embodiment of the present invention;

[0024] Figure 2 It is another schematic structural diagram of the electrode assembly provided by the embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the battery (omitting the outer shell) provided by the embodiment of the present invention;

[0026] Figure 4 A cross-sectional view of the battery (omitting the outer shell and the electrode assembly) provided by an embodiment of the present utility model;

[0027] Figure 5 Another cross-sectional view of the battery (omitting the outer shell and the electrode assembly) provided by an embodiment of the present utility model;

[0028] Figure 6 A cross-sectional view of the first conductive member and the first tab layer separated from each other provided by an embodiment of the present utility model;

[0029] Figure 7 Another cross-sectional view of the first conductive member and the first tab layer separated from each other provided by an embodiment of the present utility model;

[0030] Figure 8 A schematic structural view of the battery (omitting the outer shell) provided by an embodiment of the present utility model;

[0031] Figure 9 Another cross-sectional view of the battery (omitting the outer shell and the electrode assembly) provided by an embodiment of the present utility model;

[0032] Figure 10 Another cross-sectional view of the battery (omitting the outer shell and the electrode assembly) provided by an embodiment of the present utility model;

[0033] Figure 11 Another schematic structural view of the battery (omitting the outer shell) provided by an embodiment of the present utility model.

[0034] Among them, the reference numerals in the figures are as follows:

[0035] 100, battery; 10, electrode assembly; 20, first tab layer;

[0036] 30, second tab layer; 40, first conductive member; 50, second conductive member;

[0037] 21, first tab; 22, first stepped surface; 31, second tab;

[0038] 41, first inclined surface; 42, first clamping surface; 43, first thinning inclined surface;

[0039] 44, first thinning plane; 51, second inclined surface; 52, second clamping surface;

[0040] 53, second thinning inclined surface; 54, second thinning plane; 1, first conductive layer;

[0041] 2, insulating layer; 3, second conductive layer; 4, second welding portion;

[0042] 5. The third welding part. Detailed implementation manners

[0043] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0044] Throughout the specification, reference 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, the phrases "in one embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0047] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication 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 present utility model can be understood according to specific circumstances.

[0048] Please refer to Figures 1 to 11 to describe the battery 100 and the electrical equipment in the embodiments of the present utility model.

[0049] Please refer to Figures 1 to 4, the battery 100 provided by this application includes a housing, an electrode assembly 10, and a first conductive member 40 and a second conductive member 50 that are electrically connected to each other. The electrode assembly 10 is accommodated in the housing. A first tab layer 20 is provided on one side of the electrode assembly 10. The first tab layer 20 includes a plurality of first tabs 21 arranged in a stacked manner in the thickness direction of the electrode assembly 10. The free ends of at least some of the first tabs 21 are distributed in a stepped manner. The first conductive member 40 and the second conductive member 50 are respectively provided on opposite sides of the first tab layer 20 for jointly clamping the first tab layer 20. Among them, the first tab 21 includes a first conductive layer 1 and a second conductive layer 3 that are electrically isolated in the thickness direction. The first conductive layer 1 is located on the side of the second conductive layer 3 away from the second conductive member 50, that is, the second conductive layer 3 is located above the first conductive layer 1. Among the plurality of first tabs 21 with stepped free ends, at least two adjacent first conductive layers 1 are in contact with the first conductive member 40 to form an electrical connection.

[0050] The free ends of at least some of the first tabs 21 are distributed in a stepped manner, which can be understood as the size of the free ends of at least some of the first tabs 21 increasing or decreasing in the up and down direction. The "size of the free end" mentioned in this application refers to the size of the free end in the horizontal direction. The thickness direction mentioned in this application is parallel to the up and down direction, and the horizontal direction is perpendicular to the up and down direction.

[0051] First, after connecting the metal sheet and the multi-layer tabs by welding, it is easy to form a virtual weld between the metal sheet and the tabs, resulting in an ineffective electrical connection between the two. In this application, the first conductive member 40 and the second conductive member 50 are used to jointly clamp the first tab layer 20, which can avoid the occurrence of virtual welding between the conductive member and the first tab 21, so that an effective electrical connection can be formed between the two, effectively improving the over-current capacity of the battery 100. It is not difficult to understand that the conductive member in this application is the metal sheet in the prior art.

[0052] Secondly, the free ends of at least part of the first tab 21 of the present application are configured to be distributed in a stepped manner, and among these first tabs 21, at least two adjacent first conductive layers 1 are in contact with the first conductive member 40. For the convenience of description and understanding, the first tab 21 of the first layer and the first tab 21 of the second layer are now described. Among them, the first tab 21 of the first layer is located at the bottom layer, and the first tab 21 of the second layer is located above the first tab 21 of the first layer. The first conductive layer 1 of the first tab 21 of the first layer and the first conductive layer 1 of the first tab 21 of the second layer are two adjacent first conductive layers 1, and both are in contact with the first conductive member 40 to form an electrical connection. During the charging and discharging process of the battery 100, since the first conductive layer 1 of the first tab 21 of the second layer is in contact with the second conductive layer 3 of the first tab 21 of the first layer, current can flow to the second conductive layer 3 of the first tab 21 of the first layer. That is to say, the second conductive layer 3 of the first tab 21 of the first layer and the first conductive layer 1 of the first tab 21 of the second layer can be electrically connected to each other, and the first conductive layer 1 of the first tab 21 of the first layer and the second conductive layer 3 of the first tab 21 of the first layer can be electrically connected to each other. Compared with the prior art, the battery 100 of the present application has at least one first tab 21 in which two-sided conductive layers can be electrically connected to each other, and the first tab 21 can also be electrically connected to another adjacent first tab 21, effectively improving the over-current capacity and rate performance of the battery 100 of the present application.

[0053] In summary, through the above two aspects of improvement in the present application, an effective electrical connection between the first tab 21, the first conductive member 40, and the second conductive member 50 is achieved, effectively improving the over-current capacity of the battery 100 of the present application, thereby improving the current output capacity of the battery 100 of the present application.

[0054] The electrode assembly 10 is a component in the battery 100 where an electrochemical reaction occurs, and it includes a stacked positive electrode sheet, a separator, and a negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet and functions as an insulator. A positive tab is provided on one side of the positive electrode sheet, and a negative tab is provided on one side of the negative electrode sheet. The first tab 21 of the present application can be a positive tab or a negative tab, which is not limited herein.

[0055] In this embodiment, both the positive current collector of the positive electrode sheet and the negative current collector of the negative electrode sheet adopt composite current collectors. On the relative two sides in the thickness direction of the positive current collector and the negative current collector, that is, on the upper and lower sides, there are active material layers. As mentioned above, among some first tabs 21 of the battery 100 of the present application, since electron conduction can be achieved between the first conductive layer 1 and the second conductive layer 3, it can ensure that the active material layers on both the upper and lower sides of the current collector connected to the first tab 21 can be normally charged and discharged, effectively improving the over-current capacity and energy density of the battery 100 of the present application.

[0056] In another embodiment of the present application, please refer to Figure 4, the free ends of all the first tab ears 21 are arranged in a stepped manner, and the first conductive layers 1 of all the first tab ears 21 are in contact with the first conductive member 40, and the second conductive layer 3 of the first tab ear 21 located at the uppermost layer is in contact with the second conductive member 50. With such an arrangement, the first conductive layer 1 and the second conductive layer 3 in each first tab ear 21 can be electrically connected to each other, further improving the overcurrent capacity and energy density of the battery 100. In this embodiment, by way of example, from bottom to top, the sizes of the free ends of all the first tab ears 21 increase. Of course, in some other embodiments, from bottom to top, the sizes of the free ends of all the first tab ears 21 may decrease.

[0057] In another embodiment of the present application, please refer to Figure 5 , the battery 100 further includes a second tab ear layer 30 sandwiched between the first conductive member 40 and the second conductive member 50. The second tab ear layer 30 is located on the side of the first tab ear layer 20 close to the second conductive member 50. The second tab ear layer 30 includes a plurality of second tab ears 31 arranged in a stacked manner in the thickness direction. The second tab ear 31 includes a first conductive layer 1 and a second conductive layer 3 that are electrically isolated in the thickness direction. The free ends of at least some of the second tab ears 31 are arranged in a stepped manner. Along the same direction, the change trend of the free end of the first tab ear layer 20 is opposite to the change trend of the free end of the second tab ear layer 30. Among the plurality of second tab ears 31 with stepped free ends, at least two adjacent second conductive layers 3 are in contact with the second conductive member 50 to form an electrical connection. Similarly, with such an arrangement, the two conductive layers on both sides of at least one second tab ear 31 can be electrically connected to each other, and the second tab ear 31 and another adjacent second tab ear 31 can also be electrically connected to each other, improving the overcurrent capacity and rate performance of the battery 100.

[0058] The polarity of the second tab 31 is the same as that of the first tab 21. In the second tab 31, the second conductive layer 3 is located on the side of the first conductive layer 1 away from the first conductive member 40, that is, the second conductive layer 3 is located above the first conductive layer 1. In the first tab layer 20 and the second tab layer 30, along the same direction, the size of one free end increases, while the size of the other free end decreases. With such a setting, when the number of tabs is equal and the difference in the sizes of the free ends of two adjacent tabs is equal, the battery 100 can have a higher energy density. For example, when the number of tabs is ten and the difference in the sizes of the free ends of two adjacent tabs is 2 mm, if there is only the first tab layer 20, then the difference in the sizes of the free ends of the longest tab and the shortest tab is 18 mm. If both the first tab layer 20 and the second tab layer 30 are present and each includes five tabs, the difference in the sizes of the free ends of the longest tab and the shortest tab can be less than 18 mm. It can be seen that in this embodiment, the overall size of the battery 100 is smaller, so a higher energy density can be obtained. Of course, the above values are only exemplary and are only for convenience of illustration and understanding, and should not be regarded as a limitation of the present application.

[0059] In another embodiment of the present application, please refer to Figure 5 , the free ends of all the second tabs 31 are distributed in a stepped manner, and the second conductive layers 3 of all the second tabs 31 are in contact with the second conductive member 50. With such a setting, the first conductive layer 1 and the second conductive layer 3 in each second tab 31 can be electrically connected to each other, further improving the over-current capacity and energy density of the battery 100.

[0060] In another embodiment of the present application, please refer to Figure 5 , the first tab layer 20 and the second tab layer 30 are generally structured with shorter upper and lower ends and a longer middle part. Exemplarily, the first tab layer 20 includes four first tabs 21, the second tab layer 30 is located above the first tab layer 20 and includes three second tabs 31. From bottom to top, the sizes of the free ends of the four first tabs 21 increase, and the sizes of the free ends of the three second tabs 31 decrease. The number of the first tabs 21 and the second tabs 31 can be set according to the actual situation, and the present application does not limit this.

[0061] It can be understood that the cross-section of the first tab 21 can be semicircular, rectangular or polygonal. Similarly, the cross-section of the second tab 31 can be semicircular, rectangular or polygonal, as long as at least part of the free end of the first tab 21 and at least part of the free end of the second tab 31 are in a stepped distribution, which is not limited herein. In addition, the cross-section of the first tab 21 and the cross-section of the second tab 31 can be the same or different. In this embodiment, the cross-sections of both the first tab 21 and the second tab 31 are rectangular, so that the complexity of the first conductive member 40 and the second conductive member 50 can be reduced, and at the same time, the assembly difficulty of the first conductive member 40, the second conductive member 50, the first tab layer 20 and the second tab layer 30 can be reduced, so that an effective electrical connection can be formed therebetween, thereby ensuring the current output ability of the battery 100.

[0062] Please refer to Figure 8 , when the cross-section of the second tab 31 is rectangular, the free end of the second tab 31 includes the left end of the second tab 31 and the front and rear ends of the second tab 31. It is not difficult to understand that at least part of the second tab 31 can be such that the dimension in the horizontal direction of any one of its left end, front end and rear end increases or decreases in the up and down direction, or the dimensions in the horizontal direction of any two of its left end, front end and rear end increase or decrease in the up and down direction, or the dimensions in the horizontal direction of its left end, front end and rear end all increase or decrease in the up and down direction, which is not limited herein. In this embodiment, the dimensions in the horizontal direction of the left end, front end and rear end of all the second tabs 31 increase or decrease in the up and down direction. In this way, on the one hand, the contact area between the second tab 31 and the second conductive member 50 can be increased, and on the other hand, the second conductive member 50 can contact the second tab layer 30 in different orientations, which can increase the probability of contact between the second conductive layer 3 of the second tab 31 and the second conductive member 50, so as to ensure the over-current ability and current output ability of the battery 100.

[0063] Similarly, when the cross-section of the first tab 21 is rectangular, the free end of the first tab 21 includes the left end of the first tab 21 and the front and rear ends of the first tab 21. It is not difficult to understand that at least part of the first tab 21 can be such that the dimension of any one of its left end, front end, and rear end in the horizontal direction increases or decreases in the up and down direction, or the dimensions of any two of its left end, front end, and rear end in the horizontal direction increase or decrease in the up and down direction, or the dimensions of its left end, front end, and rear end in the horizontal direction all increase or decrease in the up and down direction, which is not limited herein. In this embodiment, the dimensions of the left end, front end, and rear end of all the first tabs 21 increase or decrease in the up and down direction in the horizontal direction. In this way, on the one hand, the contact area between the first tab 21 and the first conductive member 40 can be increased, and on the other hand, the first conductive member 40 can contact the first tab layer 20 in different orientations, which can increase the probability of contact between the first conductive layer 1 of the first tab 21 and the first conductive member 40 to ensure the overcurrent capacity and current output capacity of the battery 100.

[0064] It can be understood that at least part of the first tabs 21 and at least part of the second tabs 31 can be distributed in a stepped manner at the same end. For example, in some embodiments, from bottom to top, the dimension of the left end of at least part of the first tabs 21 increases in the horizontal direction, and the dimension of the left end of at least part of the second tabs 31 decreases in the horizontal direction. At least part of the first tabs 21 and at least part of the second tabs 31 can also be distributed in a stepped manner at different ends. For example, in some embodiments, from bottom to top, the dimension of the left end of at least part of the first tabs 21 increases in the horizontal direction, while the dimension of the front end of at least part of the second tabs 31 decreases in the horizontal direction.

[0065] In this application, the left-right direction, the front-rear direction, and the up-down direction are perpendicular to each other in pairs, and the left-right direction is the length direction of the electrode assembly 10, and the front-rear direction is the width direction of the electrode assembly 10.

[0066] In another embodiment of this application, please refer to Figure 6 and Figure 7 , a first inclined surface 41 is provided on the surface of the first conductive member 40 close to the first tab layer 20, and the first inclined surface 41 fits the stepped surface of the first tab layer 20. Specifically, among the free ends distributed in a stepped manner, the plane passing through the edge of the uppermost first conductive layer 1 and the plane passing through the edge of the lowermost first conductive layer 1 is the stepped surface of the first tab layer 20, and this stepped surface is defined as the first stepped surface 22. The first stepped surface 22 is inclined to the up-down direction, and the first inclined surface 41 is parallel to the first stepped surface 22. By providing the first inclined surface 41 on the first conductive member 40, the first conductive member 40 can be in full contact with the first tab layer 20, which is beneficial to realizing the effective electrical connection between the first tab layer 20 and the first conductive member 40.

[0067] In another embodiment of the present application, please refer to Figure 6 , an edge of the first conductive layer 1 of each first tab 21 is located within the first stepped surface 22. In this way, the first conductive layer 1 of each first tab 21 can be electrically connected to the first conductive member 40. Of course, in some other embodiments, please refer to Figure 7 , it may also be that the edges of the first conductive layers 1 of some of the first tabs 21 are located within the first stepped surface 22.

[0068] In another embodiment of the present application, please refer to Figure 9 , when the battery 100 has a second tab layer 30, a second inclined surface 51 is provided on the surface of the second conductive member 50 close to the second tab layer 30, and the second inclined surface 51 fits the stepped surface of the second tab layer 30. Specifically, among the free ends distributed in a stepped manner, the plane passing through the edge of the uppermost second conductive layer 3 and the edge of the lowermost second conductive layer 3 is the stepped surface of the second tab layer 30, and this stepped surface is defined as the second stepped surface. The second stepped surface is inclined with respect to the up-down direction, and the second inclined surface 51 is parallel to the second stepped surface. By providing the second inclined surface 51 on the second conductive member 50, the second conductive member 50 can be in full contact with the second tab layer 30, which is beneficial to realizing an effective electrical connection between the second tab layer 30 and the second conductive member 50.

[0069] In another embodiment of the present application, an edge of the second conductive layer 3 of each second tab 31 is located within the second stepped surface. In this way, the second conductive layer 3 of each second tab 31 can be electrically connected to the second conductive member 50. Of course, in some other embodiments, it may also be that the edges of the second conductive layers 3 of some of the second tabs 31 are located within the second stepped surface.

[0070] In another embodiment of the present application, among the plurality of the first tabs 21 distributed in a stepped manner at the free end, the length difference between adjacent two layers of the first tabs 21 on one side in the length direction of the electrode assembly 10 is 1 to 3 mm. As an example, the above length difference can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the range between any two of the foregoing values.

[0071] In another embodiment of the present application, among the plurality of the second tabs 31 distributed in a stepped manner at the free end, the length difference between adjacent two layers of the second tabs 31 on one side in the length direction of the electrode assembly 10 is 1 to 3 mm. As an example, the above length difference can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the range between any two of the foregoing values.

[0072] In another embodiment of the present application, among the plurality of the first tab 21 that are stepped at the free end, the width difference between adjacent two layers of the first tab 21 on one side in the width direction of the electrode assembly 10 is 1-3 mm. As an example, the above width difference may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the range between any two of the foregoing values.

[0073] In another embodiment of the present application, among the plurality of the second tab 31 that are stepped at the free end, the width difference between adjacent two layers of the second tab 31 on one side in the width direction of the electrode assembly 10 is 1-3 mm. As an example, the above width difference may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the range between any two of the foregoing values.

[0074] Controlling the length difference and the width difference within the above ranges can prevent the first tab 21 and the second tab 31 from being too long and too wide, and can enable the battery 100 to have higher overcurrent capacity and energy density.

[0075] In another embodiment of the present application, the first conductive member 40 is welded to the first tab 21 that is farthest from the second conductive member 50 to form a first welding portion, and the first welding portion is located on the first conductive member 40 and extends into the corresponding first tab 21. Specifically, the first conductive member 40 is welded to the lower surface of the first conductive layer 1 of the lowermost first tab 21. By welding the first conductive member 40 to the lowermost first tab 21, the electrical connection tightness between the first conductive member 40 and the lowermost first tab 21 can be further increased.

[0076] In another embodiment of the present application, please refer to Figure 8 , when the battery 100 has the second tab layer 30, the second conductive member 50 is welded to the second tab 31 that is farthest from the first conductive member 40 to form a second welding portion 4, and the second welding portion 4 is located on the second conductive member 50 and extends into the corresponding second tab 31. Specifically, the second conductive member 50 is welded to the upper surface of the second conductive layer 3 of the uppermost second tab 31. By welding the second conductive member 50 to the uppermost second tab 31, the electrical connection tightness between the first conductive member 40 and the uppermost second tab 31 can be further increased.

[0077] In another embodiment of the present application, please refer to Figure 5 and Figure 8, the first conductive member 40 and the second conductive member 50 are of a split structure. During assembly, the first conductive member 40 is placed below the first tab layer 20, and the first conductive layer 1 of the first tab 21 is brought into contact with the first inclined surface 41. The second conductive member 50 is placed above the second tab layer 30, and the second conductive layer 3 of the second tab 31 is brought into contact with the second inclined surface 51. Finally, one end of the first conductive member 40 away from the first tab 21 is welded to one end of the second conductive member 50 away from the second tab 31, forming a third welding portion 5, thus realizing the clamping of the first conductive member 40 and the second conductive member 50 on the first tab layer 20 and the second tab layer 30. The split structure facilitates the assembly of the first conductive member 40 and the second conductive member 50.

[0078] In another embodiment of the present application, the first conductive member 40 and the second conductive member 50 are integrally formed. The integral structure facilitates the formation of the first conductive member 40 and the second conductive member 50, which is beneficial to improving the production speed and the connection strength between the two.

[0079] In another embodiment of the present application, both the first conductive member 40 and the second conductive member 50 have elasticity. With such a setting, on the one hand, it facilitates the assembly of the integrally formed first conductive member 40 and the second conductive member 50. On the other hand, the elasticity can be used to clamp the first tab 21 and the second tab 31 to ensure effective electrical connection between the tab and the conductive member.

[0080] In another embodiment of the present application, please refer to Figure 9 , the surface of the first conductive member 40 facing the second conductive member 50 is provided with a first inclined surface 41 and a first clamping surface 42. The first inclined surface 41 is used to contact the first conductive layer 1 of a plurality of first tabs 21. The first clamping surface 42 is used to press against the lower surface of the first conductive layer 1 of the lowermost first tab 21 and jointly clamp the first tab layer 20 and the second tab layer 30 with the second conductive member 50. Generally, metal workpieces are processed from cubic blanks. In this embodiment, only the first inclined surface 41 and the first clamping surface 42 need to be processed on the cubic blank to obtain the first conductive member 40, which is beneficial to improving production efficiency.

[0081] In another embodiment of the present application, please refer to Figure 9 , the surface of the second conductive member 50 facing the first conductive member 40 is provided with a second inclined surface 51 and a second clamping surface 52. The second inclined surface 51 is used to contact the second conductive layer 3 of a plurality of second tabs 31. The second clamping surface 52 is used to press against the upper surface of the second conductive layer 3 of the uppermost second tab 31 and jointly clamp the first tab layer 20 and the second tab layer 30 with the first conductive member 40. Only setting the second inclined surface 51 and the second clamping surface 52 on the second conductive member 50 is beneficial to improving production efficiency.

[0082] By providing the first inclined surface 41, on the one hand, the shape of the first conductive member 40 is adaptively adjusted according to the shape of the bent multi-layer first tab 21, which can improve the degree of fit between the first conductive member 40 and the multi-layer first tab 21; on the other hand, since the bent multi-layer first tab 21 has a certain thickness in the height direction of the electrode assembly 10, if the first inclined surface 41 is not provided, it is impossible to ensure that the first conductive member 40 can be in contact with both the multi-layer first tab 21 and the second conductive member 50 at the same time, so it is difficult to ensure the welding quality between the first conductive member 40 and the second conductive member 50.

[0083] By providing the second inclined surface 51, on the one hand, the shape of the second conductive member 50 is adaptively adjusted according to the shape of the bent multi-layer second tab 31, which can improve the degree of fit between the second conductive member 50 and the multi-layer second tab 31; on the other hand, since the bent multi-layer second tab 31 has a certain thickness in the height direction of the electrode assembly 10, if the second inclined surface 51 is not provided, it is impossible to ensure that the second conductive member 50 can be in contact with both the multi-layer second tab 31 and the first conductive member 40 at the same time, so it is difficult to ensure the welding quality between the second conductive member 50 and the first conductive member 40.

[0084] In another embodiment of the present application, please refer to Figure 10 , a first thinning inclined surface 43 and a first thinning flat surface 44 are provided on the surface of the first conductive member 40 facing away from the second conductive member 50. The first thinning inclined surface 43 is parallel to the first inclined surface 41, and the first thinning flat surface 44 is parallel to the horizontal direction. With such a setting, the first conductive member 40 can be thinned, that is, the thickness of the first conductive member 40 is reduced. In this way, on the one hand, weight reduction can be achieved, and on the other hand, it is convenient for welding the first conductive member 40 and the second conductive member 50.

[0085] Of course, in some other embodiments, the first thinning inclined surface 43 does not need to be parallel to the first inclined surface 41, and the first thinning flat surface 44 does not need to be parallel to the horizontal direction, as long as it can play a thinning role.

[0086] In another embodiment of the present application, please refer to Figure 10 , a second thinning inclined surface 53 and a second thinning flat surface 54 are provided on the surface of the second conductive member 50 facing away from the first conductive member 40. The second thinning inclined surface 53 is parallel to the second inclined surface 51, and the second thinning flat surface 54 is parallel to the horizontal direction. With such a setting, the second conductive member 50 can be thinned, that is, the thickness of the second conductive member 50 is reduced. In this way, on the one hand, weight reduction can be achieved, and on the other hand, it is convenient for welding the first conductive member 40 and the second conductive member 50.

[0087] Of course, in some other embodiments, the second thinning inclined surface 53 does not need to be parallel to the second inclined surface 51, and the second thinning flat surface 54 does not need to be parallel to the horizontal direction, as long as it can play a thinning role.

[0088] In another embodiment of the present application, compared with the longest tab, the length of the first conductive member 40 is 10 mm to 30 mm longer. As an example, compared with the longest tab, the length of the first conductive member 40 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or the range between any two of the foregoing values. With such a setting, on the one hand, it is avoided that the length of the first conductive member 40 is insufficient, resulting in insufficient welding area between the first conductive member 40 and the first tab 21, thereby causing the first conductive member 40 to be easily separated from the first tab 21. Or it may cause insufficient welding area between the first conductive member 40 and the second conductive member 50, thereby causing the first conductive member 40 to be easily separated from the second conductive member 50. On the other hand, it is avoided that the length of the first conductive member 40 is too long, resulting in a decrease in the energy density of the battery 100.

[0089] Similarly, in another embodiment of the present application, compared with the longest tab, the length of the second conductive member 50 is 10 mm to 30 mm longer. As an example, compared with the longest tab, the length of the second conductive member 50 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or the range between any two of the foregoing values.

[0090] In another embodiment of the present application, please refer to Figure 5 , the first tab 21 further includes an insulating layer 2, and the insulating layer 2 is disposed between the first conductive layer 1 and the second conductive layer 3.

[0091] In another embodiment of the present application, please refer to Figure 5 , the second tab 31 further includes an insulating layer 2, and the insulating layer 2 is located between the first conductive layer 1 and the second conductive layer 3.

[0092] For the battery 100 using a composite current collector, due to the presence of the insulating layer 2, electrons usually cannot be transmitted from the first conductive layer 1 to the second conductive layer 3, thereby affecting the over-current capacity and rate performance of the battery 100. At the same time, affected by the insulating layer 2, it is difficult to connect the first tab layer 20 and the first conductive member 40, the second tab layer 30 and the second conductive member 50 of the battery 100 by means of traditional welding, etc. The reason is that: it is difficult for the insulating layer 3 to form a molten pool, and in addition, the tab layer is fluffy and easy to rebound, resulting in the tabs not being able to fit tightly together. After welding, it is easy to cause virtual welding, so an effective electrical connection cannot be formed. Compared with the prior art, the present application does not need to connect the first tab layer 20 and the first conductive member 40, the second tab layer 30 and the second conductive member 50 by welding to achieve electrical connection, avoiding the influence of the insulating layer on the welding quality. The present application can ensure the electrical connection effect only by contact.

[0093] The electrode assembly 10 in the present application may be a wound electrode assembly 10 or a stacked electrode assembly 10. The above embodiments are all exemplified by the stacked electrode assembly 10.

[0094] In the battery 100 provided by the present application, if the first tab 21 is a positive tab, the structure of the negative tab may be the same as that of the positive tab. If the first tab 21 is a negative tab, the structure of the positive tab may be the same as that of the negative tab to improve the current output ability of the battery 100. In addition, the present application does not particularly limit the positions of the positive tab and the negative tab. For example, in some embodiments, please refer to Figure 8 , the positive tab and the negative tab are respectively located on opposite sides of the electrode assembly 10 in the length direction. Another example is that in some embodiments, please refer to Figure 11 , both the positive tab and the negative tab are located on one side of the electrode assembly 10 in the width direction.

[0095] The present application also provides an electrical device, which includes the above-mentioned battery 100. The electrical device may include, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0096] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: shell; An electrode assembly (10) is accommodated in the housing, a first pole lug layer (20) is provided on one side of the electrode assembly (10), the first pole lug layer (20) comprises a plurality of first pole lugs (21) sequentially stacked and arranged along a thickness direction of the electrode assembly (10), and free ends of at least some of the first pole lugs (21) are arranged in a stepped manner; and A first conductive member (40) and a second conductive member (50) electrically connected to each other, wherein the first conductive member (40) and the second conductive member (50) are respectively arranged on opposite sides of the first pole tab layer (20) and are used to jointly clamp the first pole tab layer (20); The first pole lug (21) comprises a first conductive layer (1) and a second conductive layer (3) which are electrically isolated from each other along the thickness direction; the first conductive layer (1) is located on a side of the second conductive layer (3) away from the second conductive member (50); and among a plurality of first pole lugs (21) whose free ends are distributed in a stepped manner, at least two adjacent first conductive layers (1) are in contact with the first conductive member (40) to form an electrical connection.

2. The battery according to claim 1, characterized in that: The free ends of all the first pole tabs (21) are distributed in a stepped manner, and the first conductive layers (1) of all the first pole tabs (21) are in contact with the first conductive member (40).

3. The battery according to claim 1, characterized in that: The invention also comprises a second pole lug layer (30) sandwiched between the first conductive member (40) and the second conductive member (50), the second pole lug layer (30) being located on a side of the first pole lug layer (20) close to the second conductive member (50), the second pole lug layer (30) comprising a plurality of second pole lugs (31) sequentially stacked along the thickness direction, the second pole lug (31) comprising the first conductive layer (1) and the second conductive layer (3) electrically isolated along the thickness direction, the free ends of at least some of the second pole lugs (31) being arranged in a stepped manner, the change trend of the free ends of the first pole lug layer (20) being opposite to the change trend of the free ends of the second pole lug layer (30) along the same direction, and at least two adjacent second conductive layers (3) among the plurality of second pole lugs (31) having free ends arranged in a stepped manner are in contact with the second conductive member (50) to form an electrical connection.

4. The battery according to claim 3, characterized in that: The free ends of all the second pole tabs (31) are distributed in a stepped manner, and the second conductive layers (3) of all the second pole tabs (31) are in contact with the second conductive member (50).

5. The battery according to any one of claims 1 to 4, characterized in that: A first inclined surface (41) is provided on a surface of the first conductive member (40) close to the first pole tab layer (20), and the first inclined surface (41) fits the stepped surface of the first pole tab layer (20); and / or When the battery (100) has a second tab layer (30), a second inclined surface (51) is provided on a surface of the second conductive member (50) close to the second tab layer (30), and the second inclined surface (51) fits the stepped surface of the second tab layer (30).

6. The battery according to any one of claims 1 to 4, characterized in that: Among the plurality of first electrode tabs (21) whose free ends are distributed in a stepped manner, a length difference between two adjacent layers of the first electrode tabs (21) on one side in the length direction of the electrode assembly (10) is 1 to 3 mm; And / or, among the plurality of first electrode tabs (21) whose free ends are distributed in a stepped manner, the width difference between two adjacent layers of the first electrode tabs (21) on one side in the width direction of the electrode assembly (10) is 1 to 3 mm.

7. The battery according to any one of claims 1 to 4, characterized in that: The first conductive member (40) is welded to the first pole lug (21) farthest from the second conductive member (50) to form a first welding portion, wherein the first welding portion is located in the first conductive member (40) and extends to the inside of the corresponding first pole lug (21); And / or, when the battery (100) has a second pole lug layer (30), the second conductive member (50) is welded to the second pole lug (31) farthest from the first conductive member (40) to form a second welding portion (4), and the second welding portion (4) is located in the second conductive member (50) and extends to the inside of the corresponding second pole lug (31).

8. The battery according to any one of claims 1 to 4, characterized in that: The first conductive member (40) and the second conductive member (50) are integrally formed.

9. The battery according to claim 8, characterized in that: The first conductive member (40) and the second conductive member (50) are both elastic.

10. The battery according to any one of claims 1 to 4, characterized in that: The first electrode tab (21) further comprises an insulating layer (2), wherein the insulating layer (2) is arranged between the first conductive layer (1) and the second conductive layer (3); And / or, when the battery (100) has a second electrode tab layer (30), the second electrode tab (31) further comprises an insulating layer (2), and the insulating layer (2) is located between the first conductive layer (1) and the second conductive layer (3).

11. An electrical equipment, characterized in that: A battery (100) comprising any one of claims 1 to 10.

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