阅读说明：本技术 电芯、电芯组件及电池 (Electricity core, electricity core subassembly and battery ) 是由 周龙 于 2021-03-01 设计创作，主要内容包括：本申请提供了电芯、电芯组件及电池,涉及锂电池技术领域。一种电芯,包括第一极性极片、第二极性极片和隔膜,第一极性极片的极耳包括基膜和第一导电层、第二导电层,第一导电层设置于第一极性极片的第一导电侧,第二导电层设置于第一极性极片的第二导电侧,第一极性极片具有第一极耳和第二极耳,每个第一极耳叠层设置形成第一极耳结构,每个第二极耳叠层设置形成第二极耳结构。每个第一极耳露出至少部分第一导电层,每层第二极耳露出至少部分第二导电层。通过设置两个极耳结构,分别露出每层极耳的基膜两侧的导电层,使得极耳两侧的导电层上的电流能够通过转接件引出,该结构无需对每一层极耳进行单独转接,减少箔材的使用从而增加能量密度。(The application provides an electricity core, an electricity core subassembly and a battery, relates to lithium battery technical field. The utility model provides an electric core, includes first polarity pole piece, second polarity pole piece and diaphragm, the utmost point ear of first polarity pole piece includes base film and first conducting layer, second conducting layer, first conducting layer sets up in the first electrically conductive side of first polarity pole piece, the second conducting layer sets up in the electrically conductive side of second of first polarity pole piece, first polarity pole piece has first utmost point ear and second utmost point ear, every first utmost point ear stromatolite sets up and forms first utmost point ear structure, every second utmost point ear stromatolite sets up and forms second utmost point ear structure. Each first tab exposes at least a portion of the first conductive layer and each second tab exposes at least a portion of the second conductive layer. Through setting up two utmost point ear structures, expose the conducting layer of the base film both sides of every layer utmost point ear respectively for the electric current on the conducting layer of utmost point ear both sides can be drawn forth through the adaptor, and this structure need not to carry out switching alone to every layer utmost point ear, thereby reduces the use increase energy density of foil.)

1. An electric core is characterized by comprising a first polar piece, a second polar piece and a diaphragm arranged between the first polar piece and the second polar piece, wherein the first polar piece is provided with a first polar lug and a second polar lug, the first polar lug and the second polar lug respectively comprise a base film, and a first conductive layer and a second conductive layer which are respectively arranged on two sides of the base film, the first conductive layer is arranged on a first conductive side of the first polar piece, the second conductive layer is arranged on a second conductive side of the first polar piece, each first polar lug is arranged in a lamination mode to form a first polar lug structure, and each second polar lug is arranged in a lamination mode to form a second polar lug structure;

each first electrode lug exposes at least part of the first conducting layer, current is led out only from the first conducting side of the first polarity pole piece, each second electrode lug exposes at least part of the second conducting layer, and current is led out only from the second conducting side of the first polarity pole piece.

2. The electrical core of claim 1, wherein the surface of the exposed conductive layer of each of the tabs in the first tab structure has a first conductive portion, the first conductive portions of the tabs in each of the first tab structures are in the same plane, the surface of the exposed conductive layer of each of the tabs in the second tab structure has a second conductive portion, and the second conductive portions of the tabs in each of the second tab structures are in the same plane.

3. The cell of claim 2, wherein the first conductive portion is disposed at an end of the first conductive layer and the second conductive portion is disposed at an end of the second conductive layer.

4. The cell of claim 1 or 3, wherein the offset stacks of tabs in the first tab structure and/or the second tab structure form a stepped structure.

5. The cell of claim 4, wherein a dimension of the tab extending outward from the root is defined as a length of the tab, and ends of the tab in a length direction in the first tab structure and the second tab structure form a stepped structure.

6. An electric core assembly, comprising an adaptor and an electric core according to any of claims 1 to 5, wherein the first electrically conductive layer exposed by each first tab and/or the second electrically conductive layer exposed by each second tab is connected to the adaptor to enable the extraction of electric current.

7. The electrical core assembly as recited in claim 6, wherein the adaptor includes a first adaptor tab connected to the first conductive layer of exposed tabs in the first tab structure for enabling the extraction of electrical current, and a second adaptor tab connected to the second conductive layer of exposed tabs in the second tab structure for enabling the extraction of electrical current.

8. The electrical core assembly of claim 7, wherein the surfaces of the first and second interposers to which the first and second tab structures are coupled are planar.

9. The electrical core assembly of claim 7, wherein the first and second interposers are disposed on a same side of the first and second tab structures, respectively.

10. A battery comprising an outer casing and an electric core assembly according to any one of claims 6 to 9, said electric core assembly being disposed inside said outer casing.

Technical Field

The application relates to the technical field of lithium batteries, in particular to an electric core, an electric core assembly and a battery.

Background

In the production process of the lithium battery, the composite current collector is adopted to replace a metal foil current collector so as to improve the electrical property of the battery. The middle of the composite current collector adopts a polymer film, and the insulating layer formed by the polymer film can not lead the metal coatings on the two sides to be conducted. The method commonly adopted at present is to clamp the tab part of a layer of composite current collector by using two layers of metal tabs for welding, and then to weld the multiple layers of metal tabs with the positive electrode tab or the negative electrode tab of the lithium battery respectively. On one hand, the method increases the cost of processing equipment and the technological process, and has low excellent rate. And on the other hand, copper foils or aluminum foils are welded on two sides of the composite current collector, and the metal layer at the welding position of the tab is damaged to generate cracks due to the friction vibration of ultrasonic waves in the welding process.

Disclosure of Invention

An object of this application is to provide electric core, electric core subassembly and battery to improve and carry out the switching to the utmost point ear of the compound mass flow body and weld the technical problem that causes the damage to the utmost point ear.

In a first aspect, an embodiment of the present application provides an electrical core, including a first polarity pole piece, a second polarity pole piece, and a diaphragm disposed between the first polarity pole piece and the second polarity pole piece, where the first polarity pole piece has a first tab and a second tab, the first tab and the second tab both include a base film and a first conductive layer and a second conductive layer disposed on both sides of the base film, respectively, the first conductive layer is disposed on a first conductive side of the first polarity pole piece, the second conductive layer is disposed on a second conductive side of the first polarity pole piece, each first tab lamination is disposed to form a first tab structure, and each second tab lamination is disposed to form a second tab structure. Each first electrode lug exposes at least part of the first conducting layer, current is led out from the first conducting side of the first polar piece only, each second electrode lug exposes at least part of the second conducting layer, and current is led out from the second conducting side of the first polar piece only.

This application is through setting up two utmost point ear structures, exposes the conducting layer of the base film both sides of every layer utmost point ear respectively for the electric current on the conducting layer of utmost point ear both sides can be drawn forth through the adaptor, and this structure need not to carry out switching alone to every layer utmost point ear, thereby reduces the use increase energy density of foil. The electric core of this structure need not the switching welding can realize drawing forth of electric current, avoids utmost point ear in welding process ultrasonic wave to the conducting layer destruction of utmost point ear and produce the crackle, improves the quality of electric core, improves the life of battery.

In one possible implementation manner, the surface of the first conductive layer exposed by each layer of tab in the first tab structure has a first conductive part, the first conductive parts of each layer of tab in the first tab structure are all located in the same plane, the surface of the second conductive layer exposed by each layer of tab in the second tab structure has a second conductive part, and the second conductive parts of each layer of tab in the second tab structure are all located in the same plane.

The surface of the adaptor is generally a plane, and the lug structure is easy to connect the conductive part of each layer of lugs with the adaptor without machining the adaptor again.

In one possible implementation, the first conductive portion is disposed at an end of the first conductive layer, and the second conductive portion is disposed at an end of the second conductive layer.

The conductive part is arranged at the end part of the conductive layer, so that the conductive part of each layer of the tabs is easily bent to be connected with the adaptor.

In one possible implementation manner, the tabs in the first tab structure and/or the second tab structure are arranged in a staggered lamination mode to form a ladder-type structure.

The dimension of the tab extending outward from the root portion is defined as the length of the tab, and the dimension of the surface of the tab in the direction perpendicular to the length is defined as the width. The length of the tab is increased progressively along the thickness direction of the tab, and a step-shaped structure is formed at the end part of the tab structure in the length direction. This structure facilitates the connection of the conductive portion of each layer of tab with the interposer. One end of the tab with longer length, which is exposed out of the conductive layer, is bent towards the tab with shortest length, so that the conductive parts of all the tabs are on one plane.

In one possible implementation manner, the size of the tab extending outwards from the root is defined as the length of the tab, and in the first tab structure and the second tab structure, the end part of the tab in the length direction forms a stepped structure.

The ladder-type structure may be arranged in the width direction of the tab, and the general tab has a longer length and a narrower width, so that the structure is not beneficial to leading out current. The step-shaped structure is arranged at the end part in the length direction, so that the conductive part exposed out of each layer of the pole lug is in contact with the adaptor, and the extraction of current is facilitated.

In a second aspect, an electric core assembly is provided, which includes an adaptor and the electric core, and the first conductive layer exposed from each first tab and/or the second conductive layer exposed from each second tab are connected to the adaptor to realize current extraction.

The electric core component draws out the current on the conducting layers on the two sides of the pole lug through the adapter, and does not need to carry out independent adapter on each layer of pole lug, thereby reducing the use of foil and increasing the energy density. This electric core subassembly does not need the switching to weld, avoids utmost point ear in welding process ultrasonic wave to the conducting layer destruction of utmost point ear and produce the crackle, improves the quality of electric core, improves the life of battery.

In one possible implementation manner, the adaptor includes a first adaptor sheet and a second adaptor sheet, the first adaptor sheet is connected with the first conductive layer exposed from the tab in the first tab structure to achieve the extraction of the current, and the second adaptor sheet is connected with the second conductive layer exposed from the tab in the second tab structure to achieve the extraction of the current.

Two adapter plates are adopted to lead out currents in the first lug structure and the second lug structure respectively, and the improvement of the energy density of the electric core assembly is facilitated. First switching piece and second switching piece with set up the utmost point post connection on the end cover of electric core subassembly.

In one possible implementation, the surfaces of the first and second transition pieces that are connected to the first and second tab structures are planar. The structure is suitable for most of the pole lugs, and other processing technologies are not needed.

In one possible implementation, the first and second interposer sheets are disposed on the same side of the first and second tab structures, respectively.

The tab in the embodiment of the present application is provided in a wound manner. The first lug structure and the second lug structure are close to the center of the battery cell, the first conductive part of the first lug structure and the second conductive part of the second lug structure are in the same direction, and the first switching piece and the second switching piece are respectively arranged on the same side of the first lug structure and the second lug structure. The structure can avoid the mutual influence of the first lug structure and the second lug structure as much as possible.

In a third aspect, a battery is provided, which comprises a housing and the above-mentioned battery cell assembly, wherein the battery cell assembly is arranged inside the housing. The battery has high energy density.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram of an electrical core assembly provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a pole piece provided in an embodiment of the present application;

FIG. 3 is an enlarged schematic view of I in FIG. 1;

fig. 4 is a schematic structural view of a first tab structure and an adaptor according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

fig. 6 is another schematic structural diagram of a battery cell provided in an embodiment of the present application.

Icon: 100-electric core; 101-a tab configuration of a first polarity; 103-a tab structure of a second polarity; 105-a base film; 106-a first conductive layer; 107-a second conductive layer; 108-a first conductive portion; 109-a second conductive portion; 110-a first tab configuration; 111-a first tab; 120-a second ear structure; 121-a second tab; 200-a battery core assembly; 210-an adaptor; 211-a first transfer tab; 212-second interposer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the application is conventionally placed in use, which are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrical core assembly 200 according to the present embodiment. The embodiment provides a battery cell 100, which includes a first polarity pole piece, a second polarity pole piece, and a diaphragm disposed between the first polarity pole piece and the second polarity pole piece. The pole pieces in the embodiment of the application can be arranged in a winding mode and also can be arranged in a stacking mode. At least one of the first polar plate and the second polar plate is a polar plate containing a composite current collector, namely the first polar plate is a polar plate containing the composite current collector, and the second polar plate is a polar plate containing a metal current collector or a polar plate containing the composite current collector. The first and second polarity pole pieces in this embodiment are positive and negative pole pieces, respectively.

The existing pole piece containing a composite current collector usually adopts a transfer welding mode to lead out the current on a pole lug. The transfer welding is to clamp two metal foils on two sides of a tab of a composite current collector, weld the contact part of the tab, and then weld a plurality of metal foils and a positive pole of a lithium battery component together. During the welding process, the ultrasonic frictional vibration may cause the conductive layer or the metal layer at the tab welding position to be damaged and cracked. Meanwhile, the welding process increases the processing cost and the processing flow, and the excellent rate is low. The current is led out through the improvement of the pole lug structure and the connection of the pole lug and the adapter 210. The transfer welding is not needed, the damage of the welding process to the pole lug is avoided, the processing cost is reduced, and the excellent rate is improved.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a pole piece provided in this embodiment. The first polar plate is a plate containing a composite current collector, and the polar plate comprises the composite current collector and active substances arranged on two sides of the composite current collector. The composite current collector comprises a base film 105, and a first conductive layer 106 and a second conductive layer 107 respectively disposed on two sides of the base film 105, wherein the first polarity pole piece has a first conductive side and a second conductive side, and the first conductive side and the second conductive side are respectively disposed on two sides of the base film 105. The pole pieces in the first polarity pole piece are stacked, the first conductive layer 106 of the tab of each pole piece is located on the first conductive side of the first polarity pole piece, and the second conductive layer 107 of the tab of each pole piece is located on the second conductive side of the first polarity pole piece. The structure of the tab is the same as that of the composite current collector, that is, the tab of the first polarity pole piece comprises a base film 105 and a first conductive layer 106 and a second conductive layer 107 respectively arranged on two sides of the base film 105. In this embodiment, the structures and materials of the first conductive layer 106 and the second conductive layer 107 are the same, and in other embodiments of the present application, the structures and materials of the first conductive layer 106 and the second conductive layer 107 may be different, so as to ensure that the conductive polarities of the first conductive layer 106 and the second conductive layer 107 are the same.

The tab of the first polar plate is stacked, and since the base film 105 of the tab is made of an insulating polymer material, such as polyethylene or polypropylene, the first conductive layer 106 and the second conductive layer 107 cannot be conducted. In order to draw current from the first and second conductive layers 106, 107, the first polarity pole pieces have first tabs 111 and second tabs 121, the first tabs 111 of each first polarity pole piece are stacked to form a first tab structure 110, and the second tabs 121 of each first polarity pole piece are stacked to form a second tab structure 120.

Each first tab 111 in the first tab structure 110 exposes at least a portion of the first conductive layer 106 and is connected to the exposed first conductive layer 106 through an adaptor 210 to draw current from the first conductive side of the first polarity pole piece. At least a portion of the first conductive layer 106 may be understood to mean that the first tab 111 exposes a portion of the first conductive layer 106 or completely exposes the first conductive layer 106. Each layer of ears in the second ear structure 120 exposes at least a portion of the second conductive layer 107. Is connected to the exposed second conductive layer 107 through an interposer 210 to draw current from the second conductive side of the first polarity pole piece.

It should be noted that, in this embodiment, the transfer sheet and the first tab structure 110 and/or the second tab structure 120 are connected in a contact and fitting manner to achieve the drawing of the current, in other embodiments of the present application, other connection manners may be adopted to achieve the drawing of the current, and the present application is not limited thereto. In this embodiment, the outermost first tab 111 of the first tab structure 110 is exposed out of the second conductive layer 107, the first tabs 111 of other layers are not exposed out of the second conductive layer 107, similarly, the outermost second tab 121 of the second tab structure 120 is exposed out of the first conductive layer 106, and the second tabs 121 of other layers are not exposed out of the first conductive layer 106.

In this embodiment, the number of the first tab structure 110 and the second tab structure 120 is one, and in other embodiments of the present application, the number of the first tab structure 110 and the second tab structure 120 may be increased as needed, for example, four, and the number of the first tab structure 110 and the second tab structure 120 is not limited in the present application.

The tab structure formed after the lamination of the tabs has a certain thickness, and the structure enables the exposed conductive surface of each layer of the tabs to be arranged in a layered mode. If the tab structure is thick, it is not favorable for the sufficient connection between each layer of tab and the adaptor 210. As one implementation, the structure of the junction of the adaptor 210 and the tab matches the structure of the tab.

In the embodiment of the application, the conductive layer exposed out of the tab is partially bent to enable the conductive part of each layer of tab to be in the same plane by extruding or other actions on the tab. Referring to fig. 4, specifically, the surface of the first conductive layer 106 exposed from each tab in the first tab structure 110 has a first conductive portion 108, the first conductive portions 108 of each tab in the first tab structure 110 are all located in the same plane, the surface of the second conductive layer 107 exposed from each tab in the second tab structure 120 has a second conductive portion 109, and the second conductive portions 109 of each tab in the second tab structure 120 are all located in the same plane. This configuration facilitates the connection of the conductive portion of each layer of tabs to the interposer 210, where the connection of the interposer 210 is planar.

In some embodiments of the present application, the tab offset stacks in the first tab structure 110 and/or the second tab structure 120 form a stepped structure. First conductive portion 108 is provided at an end of first conductive layer 106, and second conductive portion 109 is provided at an end of second conductive layer 107. In this embodiment, the dimension of the tab extending outward from the root portion is defined as the length of the tab, and the dimension of the surface of the tab in the direction perpendicular to the length is defined as the width. The lengths of the tabs in the first tab structure 110 and/or the second tab structure 120 are increased in the thickness direction of the tabs, and a stepped structure is formed at the end of the tab structure in the length direction. In other embodiments of the present application, a stepped structure may be formed at the end in the width direction of the tab. Furthermore, in the step type tab structure, the length difference between two adjacent tabs is 0.3-5 mm. One end of the tab with longer length, which is exposed out of the conductive layer, is bent towards the tab with shortest length, so that the conductive parts of all the tabs are on one plane.

It should be noted that the lengths of the extending portions of the root portions of the tabs in the application may be the same, and when the tabs are stacked, the stepped tab structure is obtained by folding the tabs, or the tabs on different layers may be cut into different lengths in the tab cutting process, and the tab stacked layers obtain the stepped tab structure.

In other embodiments of the present application, when the widths of the tabs in the first tab structure 110 and/or the second tab structure 120 increase in the thickness direction of the tabs, one or both ends of the widths of the tab structures form a stepped structure. The specific structure of the first tab structure 110 and/or the second tab structure 120 may be set as required, and the area of the exposed conductive layer is increased, which is beneficial to improving the current extraction efficiency. Similarly, the end in the width direction of the tab having a wider width is bent toward the tab having the shortest width so that the conductive portions of all the tabs are on one plane.

In some embodiments of the present application, the first tab structure 110 and/or the second tab structure 120 have holes, such that a hole is formed at a position corresponding to each layer of tab, and the hole diameter of the hole increases along the thickness direction of the tab structure, such that each layer of tab can expose a portion of the conductive layer to be connected with the adaptor 210. The exposed conductive portions of each layer of the pole ears are folded to lie in a plane.

Referring to fig. 5, in some embodiments of the present application, the second polarity electrode plate is an electrode plate containing a metal foil current collector, the second polarity electrode plate is provided with a tab structure for drawing current, and the battery cell 100 includes two tab structures 101 of a first polarity and a tab structure 103 of a second polarity. Referring to fig. 6, in some embodiments of the present application, the second polarity electrode sheet is an electrode sheet including a composite current collector, and is provided with two tab structures, one of which is used for leading out a conductive layer on one side of a tab base film 105, and one of which is used for leading out a conductive layer on the other side of the tab base film 105, and the battery cell 100 includes two tab structures 101 of a first polarity and two tab structures 103 of a second polarity. The quantity of utmost point ear structure in this application embodiment changes according to the structure of utmost point ear, and this application does not limit it.

The application provides a battery core 100 is including the pole piece that contains the compound mass flow body, because the conducting layer of the base film 105 both sides of the compound mass flow body does not switch on, through setting up two utmost point ear structures, and two utmost point ear structures expose the conducting layer of both sides respectively for electric current on the utmost point ear can be drawn forth through adaptor 210, and then increases the energy density of battery. The electric core 100 of this structure need not the switching welding can realize drawing forth of electric current, avoids utmost point ear in welding process ultrasonic wave to the conducting layer destruction of utmost point ear and produce the crackle, improves electric core 100's quality, improves the life of battery.

Referring to fig. 1 and 3, the present application further provides an electric core assembly 200, which includes an adaptor 210 and an electric core 100, wherein the first conductive layer 106 exposed from the tab in the first tab structure 110 and/or the second conductive layer 107 exposed from the tab in the second tab structure 120 are connected to the adaptor 210 to implement current extraction.

In some embodiments of the present application, the interposer 210 includes a first interposer 211 and a second interposer 212, the first interposer 211 is connected to the first conductive layer 106 exposed from the tab in the first tab structure 110 to enable current extraction, and the second interposer 212 is connected to the second conductive layer 107 exposed from the tab in the second tab structure 120 to enable current extraction from the interposer 210. The contact surfaces of the first and second tabs 211, 212 and the tab structure are matched to the structure of the first and second conductive portions 108, 109. In the embodiment of the present application, the first conductive portion 108 and the second conductive portion 109 are both planar, the first interposer 211 and the second interposer 212 are rectangular solids, a surface where the first interposer 211 and the first tab structure 110 are connected is a planar surface, and a surface where the second interposer 212 and the second tab structure 120 are connected is a planar surface.

The battery assembly 200 further includes a housing (not shown) having an opening, and an end cap (not shown) disposed in the housing and covering the opening. The first and second transition pieces 211 and 212 are connected to the poles on the end cap.

Referring to the drawings, the tab in the embodiment of the present application is disposed in a winding manner. The first tab structure 110 and the second tab structure 120 are close to the center of the battery cell 100, the first conductive portion 108 of the first tab structure 110 and the second conductive portion 109 of the second tab structure 120 are oriented in the same direction, and the first interposer 211 and the second interposer 212 are respectively disposed on the same side of the first tab structure 110 and the second tab structure 120.

In other embodiments of the present application, the tabs are arranged in a stack. The first tab structure 110 and the second tab structure 120 are close to the center of the battery cell 100. The first conductive portion 108 of the first tab structure 110 and the second conductive portion 109 of the second tab structure 120 are oriented oppositely, and are both oriented toward the center of the battery cell 100. The first tab structure 110 and the second tab structure 120 are connected to an interposer, which is located at the center of the battery cell 100.

The application provides an electricity core subassembly 200 contacts and laminates first utmost point ear structure 110 and first commentaries on classics piece 211, because utmost point ear dislocation stromatolite setting in first utmost point ear structure 110, applys the effort to first utmost point ear structure 110 at the laminating in-process for every layer utmost point ear is close to and buckles to first commentaries on classics piece 211, makes the conducting layer that every layer utmost point ear exposes all contact, laminate with first commentaries on classics piece 211. Similarly, in the process of contacting and attaching the second tab structure 120 to the second interposer 212, each layer of tab in the second tab structure 120 is close to the second interposer 212 and is bent, so that the exposed conductive layer of each layer of tab is contacted and attached to the second interposer 212. In the embodiment of the present application, the first tab structure 110 and the first adaptor sheet 211, and the second tab structure 120 and the second adaptor sheet 212 are fixed by a fixing member or an adhesive, which is not limited in the present application.

The electric core assembly 200 draws out the current on the conductive layers on the two sides of the tab through the adaptor, thereby increasing the energy density of the battery. This electricity core subassembly 200 need not the switching welding, avoids utmost point ear in welding process ultrasonic wave to the conducting layer destruction of utmost point ear and produce the crackle, improves electric core 100's quality, improves the life of battery.

The present application also provides a battery (not shown) including a housing (not shown) and an electric core assembly 200, the electric core assembly 200 being disposed inside the housing. The battery has high energy density.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.