CN113422167A

CN113422167A - Connecting piece, battery monomer and battery package

Info

Publication number: CN113422167A
Application number: CN202110798109.4A
Authority: CN
Inventors: 周龙; 吴聪苗; 郭敏; 蓝金花
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Haichen New Energy Technology Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-09-21

Abstract

The invention discloses a connecting piece, a battery monomer and a battery pack, wherein the connecting piece is used for electrically connecting a plurality of layers of lugs of a current collector, and comprises: the lug comprises a plurality of bulges which are arranged on the connecting plate at intervals and penetrate through a plurality of layers. According to the connecting piece, the bulges are arranged on the connecting piece, so that the connecting piece is easy to connect with the lugs, the welding difficulty of the lugs is reduced, the welding process of workers is simplified, the manufacturing working hours are reduced, the labor cost is reduced, the connecting strength between the lugs and the connecting piece is improved, the connection is stable, and the reliability of a single battery is ensured.

Description

Connecting piece, battery monomer and battery package

Technical Field

The invention relates to the technical field of batteries, in particular to a connecting piece, a battery monomer and a battery pack.

Background

In the related art, copper foils are welded on two sides of a single-layer tab in an ultrasonic roll welding mode, and the welded copper foils are welded on a flexible connection. In the welding mode, each layer of tab needs to be welded, so that the welding cost is increased, and the material cost of the copper foil is increased.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a connecting piece, a battery monomer and a battery pack, wherein the connecting piece is ingenious in design and can reduce the welding difficulty of a lug.

The invention also provides a battery monomer.

The invention also provides a battery pack.

The connector according to the first aspect of the present invention for electrically connecting multilayer tabs of a current collector, comprises: the lug comprises a plurality of bulges which are arranged on the connecting plate at intervals and penetrate through a plurality of layers.

According to the connecting piece, the bulges are arranged on the connecting piece, so that the connecting piece is easy to connect with the lugs, the welding difficulty of the lugs is reduced, the welding process of workers is simplified, the manufacturing working hours are reduced, the labor cost is reduced, the connecting strength between the lugs and the connecting piece is improved, the connection is stable, and the reliability of a single battery is ensured.

In some embodiments, the connecting plate is integrally formed with the plurality of protrusions.

In some embodiments, the plurality of protrusions are welded, adhered, plugged or clamped on the connecting plate.

In some embodiments, the connector further comprises: the convex plate is fixed on the connecting plate, and the plurality of protrusions are arranged on one side, deviating from the connecting plate, of the convex plate.

In some embodiments, a plurality of the protrusions are arranged in a matrix on the one side surface of the connection board.

Further, the protrusions extend in a straight line and/or a curved line on the surface of the connection plate.

Further, the width of the protrusions is in the range of 0.1mm-3 mm.

Further, the cross section of the protrusion perpendicular to the protrusion height is circular, elliptical or polygonal.

Furthermore, the height of the protrusion protruding from the connecting plate ranges from 0.1mm to 3 mm.

Furthermore, the connecting plate and the protrusion are made of the same material.

A battery cell according to a second aspect of the invention includes: the current collector comprises a plurality of pole pieces which are arranged in a stacked mode, and the pole pieces comprise pole lugs; conductive connection subassembly, conductive connection subassembly includes the connecting piece of above-mentioned first aspect, a plurality of the connecting piece the arch passes the multilayer utmost point ear and with utmost point ear electricity is connected.

According to the single battery, the conductive connecting component provided with the connecting piece in the first aspect is applied to the single battery, so that the assembly difficulty of the single battery is reduced, the manufacturing time of the single battery is reduced, the labor cost is reduced, and the reliability of the single battery is ensured.

In some embodiments, the pole piece comprises: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

A battery pack according to a third aspect of the present invention is characterized by including the battery cell of the second aspect.

According to the battery pack, the battery monomer in the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic view of a conductive connection assembly according to an embodiment of the first aspect of the present invention;

fig. 2 is a schematic diagram of a side view of the conductive connection assembly shown in fig. 1;

FIG. 3 is a schematic view of the connector shown in FIG. 1;

FIG. 4 is a schematic illustration of a side view of the connector shown in FIG. 3;

FIG. 5 is an enlarged partial view of the projection shown in FIG. 4;

FIG. 6 is a schematic view of another embodiment of the connector shown in FIG. 1;

FIG. 7 is a schematic view of a connector of the further embodiment shown in FIG. 1;

FIG. 8 is a schematic view of the connection shown in FIG. 1, wherein the projections are formed as cones;

FIG. 9 is a schematic illustration of a side view of the connector shown in FIG. 8;

FIG. 10 is a schematic view of a connector of yet another embodiment shown in FIG. 1;

FIG. 11 is a schematic illustration of a side view of the connector shown in FIG. 10;

FIG. 12 is a schematic view of the connector shown in FIG. 1, wherein the projection includes a connecting segment and a piercing segment;

FIG. 13 is a schematic illustration of a side view of the connector shown in FIG. 12;

FIG. 14 is a schematic view of the connector shown in FIG. 1, wherein the protrusions are formed as pyramids;

FIG. 15 is a schematic illustration of a side view of the connector shown in FIG. 14;

FIG. 16 is a schematic view of a coupling of the embodiment shown in FIG. 1;

FIG. 17 is a schematic illustration of a side view of the connector shown in FIG. 16;

fig. 18 is a schematic diagram of a side view of the conductive connection assembly shown in fig. 16;

fig. 19 is a schematic view of a battery cell according to an embodiment of the second aspect of the invention;

FIG. 20 is a schematic view of the connector shown in FIG. 19;

FIG. 21 is a schematic illustration of a top view of the connector shown in FIG. 20;

fig. 22 is a schematic view of a battery cell of another embodiment;

FIG. 23 is a schematic view of the connector shown in FIG. 22;

FIG. 24 is a schematic illustration of a top view of the connector shown in FIG. 23;

fig. 25 is a schematic view of a battery cell of yet another embodiment;

FIG. 26 is a schematic view of the connector shown in FIG. 25;

FIG. 27 is a schematic illustration of a top view of the connector shown in FIG. 26;

fig. 28 is a schematic view of a current collector.

Reference numerals:

the conductive connection assembly 100, the connection member 101, the connection plate 1011,

the protrusions 1012, the protective plate 201,

current collector 202, pole piece 2021, tab 20211,

a first conductive layer 202111, a second conductive layer 202112, a support insulator layer 202113,

the battery cell 1000.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

First, a battery cell 1000 according to an embodiment of the second aspect of the present invention will be briefly described with reference to fig. 1 to 28, the battery cell 1000 including a connection member 101 according to an embodiment of the first aspect of the present invention.

The battery cell 1000 according to an embodiment of the present invention includes: a current collector 202 and a conductive connection assembly 100.

Specifically, as shown in fig. 1 to 28, the battery cell 1000 includes: the current collector 202 and the conductive connection assembly 100, the current collector 202 includes a plurality of pole pieces 2021 arranged in a stacked manner, the pole pieces 2021 include tabs 20211, the conductive connection assembly 100 includes the connection member 101 according to the first embodiment of the present invention, and the plurality of protrusions 1012 of the connection member 101 penetrate through the plurality of layers of tabs 20211 and are electrically connected to the tabs 20211. That is, the battery cell 1000 has a current collector 202 and a conductive connection assembly 100, the current collector 202 has a plurality of pole pieces 2021, the plurality of pole pieces 2021 are stacked, the pole pieces 2021 have tabs 20211, the conductive connection assembly 100 has a connection member 101, the connection member 101 is the connection member 101 according to the embodiment of the first aspect of the present invention, the connection member 101 includes a connection plate 1011 and a protrusion 1012, the protrusion 1012 has a plurality of protrusions 1012, and the plurality of protrusions 1012 are located on the connection plate 1011. Therefore, the battery cell 1000 has a simple structure, the tab 20211 and the connector 101 are connected in a simple manner, and the connection stability is good.

In some embodiments of the invention, pole piece 2021 comprises: a support insulating layer 202113, and a first conductive layer 202111 and a second conductive layer 202112 which cover both side surfaces in the thickness direction of the support insulating layer 202113, respectively. Referring to fig. 28, a support insulating layer 202113 is interposed between a first conductive layer 202111 and a second conductive layer 202112, and the first conductive layer 202111 and the second conductive layer 202112 cover an upper surface and a lower surface of the support insulating layer 202113, respectively.

A connection 101 according to an embodiment of the first aspect of the invention is described below with reference to fig. 1-28.

As shown in fig. 3, a connector 101 according to an embodiment of the first aspect of the present invention includes: a connecting plate 1011 and a projection 1012.

Specifically, the connector 101 is used for electrically connecting the multilayer tabs 20211 of the current collector 202, and the connector 101 includes: the lug plate 1011 and the protrusion 1012 arranged on the connection plate 1011, the protrusion 1012 protrudes out of one side surface of the connection plate 1011 in the thickness direction, the protrusion 1012 comprises a plurality of protrusions, the plurality of protrusions 1012 are arranged on the connection plate 1011 at intervals, and the plurality of protrusions 1012 penetrate through the multi-layer tab 20211. That is, the multilayer tabs 20211 of the current collector 202 are electrically connected by the connection member 101, the connection member 101 has a connection plate 1011 and a plurality of projections 1012, the multilayer tabs 20211 are penetrated by the plurality of projections 1012, the plurality of projections 1012 are provided at intervals on one side surface of the connection plate 1011 in the thickness direction, and the plurality of projections 1012 project toward a direction away from the connection plate 1011.

Referring to fig. 3, the connection plate 1011 is formed in a horizontally extending plate body shape, the protrusions 1012 have a plurality, the plurality of protrusions 1012 are provided on the upper surface of the connection plate 1011, and the plurality of protrusions 1012 are all protruded upward, each protrusion 1012 is provided at regular intervals in the horizontal direction, and each protrusion 1012 penetrates through the multi-layered tab 20211. Therefore, the connection strength between the tab 20211 and the connecting piece 101 is improved, the connection is stable, and the reliability of the battery cell 1000 is ensured.

According to the connecting piece 101 provided by the embodiment of the invention, the protrusion 1012 is arranged on the connecting piece 101, the connecting piece 101 is easy to be connected with the tab 20211, welding energy is easy to penetrate through the connecting piece 101 and the tab 20211, the welding difficulty of the tab 20211 is reduced, the welding process of workers is simplified, the manufacturing working hours are reduced, the labor cost is reduced, the connecting strength between the tab 20211 and the connecting piece 101 is improved, the connection is stable, and the reliability of the battery cell 1000 is ensured.

In some embodiments of the present invention, the connection plate 1011 and the plurality of protrusions 1012 are integrally formed, so that the number of parts of the connection member 101 is reduced, the overall connection strength of the connection member 101 is improved, the connection stability of the connection member 101 and the tab 20211 is improved, the defective rate of the connection member 101 is reduced, and the service life of the connection member 101 is prolonged.

In other embodiments of the present invention, the connecting plate 1011 and the plurality of protrusions 1012 are separately disposed, and the plurality of protrusions 1012 are welded, bonded, inserted or clamped on the connecting plate 1011, so that the connecting plate 1011 and the protrusions 1012 are two independent components, which reduces the production difficulty of the connecting member 101, reduces the production cost of the connecting member 101, and improves the fault tolerance of the connecting member 101 and the tab 20211 during the welding process.

Preferably, a plurality of protrusions 1012 are connected with the connecting plate 1011 by welding, the connection is simple, and the protrusions 1012 are firmly connected with the connecting plate 1011 and are not easy to damage.

Specifically, the plurality of protrusions 1012 may be connected to the connection plate 1011 by means of electromagnetic pulse welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by friction welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by means of ultrasonic welding.

In some embodiments of the invention, the connector 101 further comprises: a raised plate (not shown) secured to the connection plate 1011, and a plurality of protrusions 1012 provided on a side of the raised plate facing away from the connection plate 1011. That is, the connector 101 includes a convex plate fixedly connected to the connecting plate 1011 and a connecting plate 1011, the convex plate is integrally formed with a plurality of protrusions 1012, and the plurality of protrusions 1012 are formed on a side surface (e.g., an upper side surface shown in fig. 4) of the convex plate facing away from the connecting plate 1011. Therefore, the structure of the connecting plate 1011 is prevented from being damaged, and the manufacturing process of welding the plurality of protrusions 1012 on the connecting plate 1011 is simplified.

In some embodiments of the invention, the plurality of protrusions 1012 are arranged in a matrix on one side surface of the connecting plate 1011, and the plurality of protrusions 1012 arranged in an array improves the connection strength between the tab 20211 and the connecting member 101, thereby preventing the tab 20211 and the connecting member 101 from being separated from each other in the transportation or use process, improving the yield of the battery cell 1000, increasing the contact area between the protrusions 1012 and each layer of tab 20211, increasing the flow area, balancing the heat dissipation, preventing the battery pack from easily failing, reducing the risk factor of a user, and improving the use experience of the user.

In some embodiments of the invention, the protrusions 1012 extend in a straight line and/or a curved line on the surface of the connection plate 1011. That is, the protrusion 1012 may extend linearly on the surface of the connection plate 1011, the protrusion 1012 may extend curvilinearly on the surface of the connection plate 1011, and the protrusion 1012 may extend linearly and curvilinearly on the surface of the connection plate 1011, or extend curvilinearly and rectilinearly. Therefore, the welding requirements of different composite current collectors 202 are met, the connection strength between the tab 20211 and the connecting piece 101 is improved, the application range of the connecting piece 101 is expanded, and the production cost of the connecting piece 101 is reduced.

Referring to fig. 27, the protrusion 1012 extends along a curve on the upper surface of the connection plate 1011, the protrusion 1012 is formed in a ring shape, four grooves are formed on the upper portion of the protrusion 1012, the four grooves are uniformly spaced on the upper portion of the protrusion 1012, and the four grooves are recessed downward from the upper end surface of the protrusion 1012 in the vertical direction, so that the contact area between the protrusion 1012 and each layer of the pole lugs 20211 is increased, the flow area is increased, and the connection strength is improved.

In some embodiments of the present invention, the width of the protrusion 1012 is in the range of 0.1mm to 3mm, thereby not only avoiding waste of materials, but also ensuring the connection stability of the tab 20211 and the connection member 101. For example, the width of protrusion 1012 may be: 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.55mm, 0.6mm, 0.85mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.35mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.45mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, and the like.

Alternatively, the cross-section of the protrusions 1012 perpendicular to the protrusion height may be circular, elliptical, or polygonal.

Specifically, when the cross section of the projection 1012 perpendicular to the projection height is circular, the projection 1012 may be cylindrical, conical, or truncated-cone-shaped, or the like; when the cross section of the protrusion 1012 perpendicular to the protrusion height is elliptical, the protrusion 1012 may be elliptical cylindrical, elliptical conical, or elliptical truncated, etc.; when the cross section of the protrusion 1012 perpendicular to the protrusion height is polygonal, the cross section may be triangular or quadrangular, etc., and the protrusion 1012 may be triangular pyramid, triangular prism, quadrangular pyramid, quadrangular prism, pentagonal pyramid, hexagonal pyramid, etc.

In some embodiments of the present invention, the height of the protrusion 1012 protruding from the connecting plate 1011 is in the range of 0.1mm to 3mm, which not only avoids the waste of materials, but also ensures the connection strength between the tab 20211 and the connecting member 101, and the overall structure of the battery cell 1000 is convenient to assemble into a battery pack, thereby saving the installation space, making the structure compact, reducing the volume of the battery pack, and reducing the transportation cost.

For example, the height of the protrusion 1012 protruding from the connection plate 1011 may be: 0.1mm, 0.15mm, 0.2mm, 0.4mm, 0.55mm, 0.6mm, 0.85mm, 1.0mm, 1.1mm, 1.2mm, 1.35mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.2mm, 2.45mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, and the like.

In some embodiments of the invention, the connection plate 1011 is made of the same material as the protrusions 1012. Because the material is different, the temperature resistance of conductor and the parameter such as resistance are also different, have great potential safety hazard, and use the same material, then guaranteed battery monomer 1000's reliability, reduced the fault rate, also guaranteed the safety in utilization of battery package, avoided the emergence of accident.

Alternatively, the connection plate 1011 uses T2 pure copper or copper alloy, etc.

In some embodiments, the connector 101 may be connected to the multilayer tab 20211 of the current collector 202 by ultrasonic welding, the connector 101 comprising: the connection plate 1011 and the protrusion 1012 that sets up on the connection plate 1011, protrusion 1012 is protruding in one side surface of connection plate 1011 in the thickness direction, and the protrusion 1012 includes a plurality ofly, and a plurality of protrusions 1012 pass multilayer utmost point ear 20211, and the density that a plurality of protrusions 1012 arranged in the ultrasonic vibration direction is greater than the density of other directions except ultrasonic vibration direction.

That is, the multilayer tab 20211 of the current collector 202 is connected to the connection member 101 by ultrasonic welding, the connection member 101 has a connection plate 1011 and a plurality of protrusions 1012, the multilayer tab 20211 is penetrated by the plurality of protrusions 1012, the plurality of protrusions 1012 are provided at intervals on one side surface of the connection plate 1011 in the thickness direction, and the plurality of protrusions 1012 protrude toward a direction away from the connection plate 1011, the plurality of protrusions 1012 are arranged at the highest density in the ultrasonic vibration direction, and the plurality of protrusions 1012 are arranged at a lower density in the other directions than the ultrasonic vibration direction than the plurality of protrusions 1012 in the ultrasonic vibration direction.

When ultrasonic welding is used, high-frequency vibration which is tens of thousands of times per second is generated when ultrasonic waves act on the contact surface of a welded object, the plurality of protrusions 1012 are densely arranged along the vibration direction of the ultrasonic waves, the protrusions 1012 easily pierce through the multi-layer tab 20211, welding energy can penetrate through the connecting piece 101 and the tab 20211 more easily, and the welding difficulty of the tab 20211 and the connecting piece 101 is reduced.

Referring to fig. 4, the connection plate 1011 is formed in a horizontally extending plate body shape, the protrusions 1012 have a plurality of protrusions 1012, the plurality of protrusions 1012 are disposed on the upper surface of the connection plate 1011, and the plurality of protrusions 1012 are all protruded upward, each protrusion 1012 is disposed at regular intervals in the horizontal direction, each protrusion 1012 penetrates through the multi-layer tab 20211, and the plurality of protrusions 1012 are arranged at the highest density in the ultrasonic vibration direction. Therefore, welding energy easily penetrates through the connecting piece 101 and the tab 20211, the welding difficulty of the tab 20211 is reduced, and the welding process of workers is simplified.

In other embodiments, in the thickness direction of the tab 20211 (for example, in the up-down direction shown in fig. 19), multiple layers of the tab 20211 are stacked, the protective plate 201 is disposed on one side of the multiple layers of the tab 20211 (for example, on the upper side of the multiple layers of the tab 20211 shown in fig. 19), the connection plate 1011 is disposed on the other side of the multiple layers of the tab 20211 (for example, on the lower side of the multiple layers of the tab 20211 shown in fig. 19), the connection plate 1011 is connected to one end of the projection 1012 (for example, the lower end of the projection 1012 shown in fig. 19), the projection 1012 pierces through the multiple layers of the tab 20211, and the projection 1012 is electrically connected to the multiple layers of the tab 20211, and the other end of the projection 1012 (for example, the upper end of the projection 1012 shown in fig. 19) is located in a layer of the surface of the protective plate 201 facing the connection plate 1011. Thus, the projections 1012 are prevented from being damaged, and the service life of the multilayer tab 20211 is prolonged.

In other embodiments, referring to FIG. 5, the protrusions 1012 comprise two portions: a connecting section 10121 and a puncture section 10122, the lower part of the protrusion 1012 is the connecting section 10121, the upper part of the protrusion 1012 is the puncture section 10122, the connecting section 10121 is connected with the connecting plate 1011, and the puncture section 10122 is connected at the upper end of the connecting section 10121.

Specifically, the piercing section 10122 of the protrusion 1012 is used for piercing the multi-layer tab 20211, and the connecting section 10121 of the protrusion 1012 is used for connecting the multi-layer tab 20211, so that welding energy easily penetrates through the connecting piece 101 and the tab 20211, the welding difficulty of the tab 20211 and the connecting piece 101 is reduced, the manufacturing time is reduced, the connecting strength between the tab 20211 and the connecting piece 101 is improved, the connection is stable, and the piercing effect of the protrusion 1012 is ensured while the connecting strength is improved.

A connector 101 according to one embodiment of the present invention will be described with reference to fig. 1-28.

Referring to fig. 3, the protrusion 1012 is formed in a long bar shape, the connection member 101 has a connection plate 1011 and a protrusion 1012, the protrusion 1012 includes a plurality of protrusions, each protrusion 1012 protrudes upward from an upper surface of the connection plate 1011, and the plurality of protrusions 1012 are arranged in a matrix form on the upper surface of the connection plate 1011, a length L of the protrusion 1012 is 13mm, a height of the protrusion 1012 is 0.6mm, a width d of the protrusion 1012 is 0.6mm, the protrusion 1012 extends in a straight line on the upper surface of the connection plate 1011, and the connection plate 1011 is integrally formed with the plurality of protrusions 1012.

The battery cell 1000 according to the embodiment of the second aspect of the present invention includes a current collector 202 and a conductive connection assembly 100, wherein the conductive connection assembly 100 includes the connection member 101 according to the embodiment of the first aspect of the present invention.

According to the battery cell 1000 of the embodiment of the invention, the conductive connecting component 100 provided with the connecting component 101 of the embodiment of the first aspect is applied to the battery cell 1000, so that the assembly difficulty of the battery cell 1000 is reduced, the manufacturing time of the battery cell 1000 is reduced, the labor cost is reduced, and the reliability of the battery cell 1000 is ensured.

The battery pack according to the embodiment of the third aspect of the present invention includes the battery cell 1000 according to the embodiment of the second aspect of the present invention described above.

According to the battery pack provided by the embodiment of the invention, the battery monomer 1000 in the embodiment of the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A connector for electrically connecting a multi-layer tab of a current collector, the connector comprising: the lug comprises a plurality of bulges which are arranged on the connecting plate at intervals and penetrate through a plurality of layers.

2. A fitting according to claim 1, wherein said web is integrally formed with a plurality of said projections.

3. The connector according to claim 1, wherein the plurality of protrusions are welded, adhered, inserted or snapped onto the connecting plate.

4. The connector of claim 1, further comprising: the convex plate is fixed on the connecting plate, and the plurality of protrusions are arranged on one side, deviating from the connecting plate, of the convex plate.

5. The connector according to claim 1, wherein a plurality of said projections are arranged in a matrix pattern on said one side surface of said connector board.

6. A connection piece according to claim 1, wherein said projections extend in a straight and/or curved line on the surface of said connection plate.

7. A connection piece according to claim 6, wherein the width of the projections is in the range 0.1mm-3 mm.

8. A connection piece according to claim 1, wherein the cross-section of the protrusion perpendicular to the protrusion height is circular, oval or polygonal.

9. A connector according to claim 1, wherein the height of the projections projecting from the web is in the range 0.1mm to 3 mm.

10. A connection piece according to claim 1, wherein said web is of the same material as said projections.

11. A battery cell, comprising:

the current collector comprises a plurality of pole pieces which are arranged in a stacked mode, and the pole pieces comprise pole lugs;

a conductive connection assembly including a connector as claimed in any one of claims 1 to 10, a plurality of said projections of said connector passing through and being electrically connected to a plurality of layers of said tabs.

12. The battery cell of claim 11, wherein the pole piece comprises: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

13. A battery pack comprising the battery cell according to claim 11 or 12.