阅读说明：本技术 连接件、电池单体和电池包 (Connecting piece, battery monomer and battery package ) 是由 周龙 吴聪苗 郭敏 蓝金花 于 2021-07-14 设计创作，主要内容包括：本发明公开了一种连接件、电池单体和电池包,所述连接件用于电连接集流体的多层极耳,所述连接件包括：连接板和凸起,所述凸起设于所述连接板上且凸出于所述连接板在厚度方向的其中一侧表面,所述凸起包括多个,多个所述凸起在所述连接板上间隔设置,多个所述凸起穿过多层所述极耳,在所述凸起高度方向上,所述凸起的自由端端面形成为平面。根据本发明的连接件,通过在连接件上设置顶端端面为平面的凸起,降低了极耳的焊接难度,简化了工人的焊接过程,提高了极耳与连接件之间的连接强度,保证了电池单体的可靠性,降低了故障率,提升了电池单体的安全系数,保证了电池单体的使用安全,避免了安全隐患,减少了危险事故的发生。(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 is arranged on the lug, and the free end face of the lug is formed into a plane in the height direction of the lug. According to the connecting piece, the bulges with the plane top end surfaces are arranged on the connecting piece, so that the welding difficulty of the lugs is reduced, the welding process of workers is simplified, the connecting strength between the lugs and the connecting piece is improved, the reliability of the single battery is ensured, the fault rate is reduced, the safety coefficient of the single battery is improved, the use safety of the single battery is ensured, potential safety hazards are avoided, and dangerous accidents are reduced.)

1. A connector for electrically connecting a multi-layer tab of a current collector, the connector comprising:

a connecting plate; and

the lug is arranged on the connecting plate and protrudes out of one side surface of the connecting plate in the thickness direction, the lug comprises a plurality of protrusions which are arranged on the connecting plate at intervals and are multiple, the lugs penetrate through multiple layers, and in the height direction of the lugs, the end face of each free end of each protrusion is formed into a plane.

2. The connector according to claim 1, wherein the cross-sectional areas of the projections are the same in the height direction of the projections.

3. A connection piece according to claim 2, wherein the cross-sectional area of the protrusion is no more than 5mm²。

4. A connection piece according to claim 2, wherein the cross-sectional shape of the protrusion perpendicular to the protrusion height is circular, elliptical or polygonal.

5. A connection piece according to claim 4, wherein the ratio of the cross-sectional area of said projections to the height of said projections is not more than 5.

6. The connector according to claim 4, wherein the cross-sectional shape of the protrusion is formed in a circular shape, and the radius of the protrusion is not more than 3 mm.

7. The connector according to claim 4, wherein the cross-sectional shape of the projection is formed in a square shape, and the side length of the cross-section of the projection is not more than 3 mm.

8. A connection piece according to claim 7, wherein the ratio between the side length of the cross-section of the projection and the height of the projection is not more than 1.

9. 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 8, a plurality of said projections of said connector passing through and being electrically connected to a plurality of layers of said tabs.

10. The battery cell of claim 9, 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.

11. A battery pack comprising the battery cell according to claim 9 or 10.

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: a connecting plate; and the arch is arranged on the connecting plate and protrudes out of the surface of one side of the connecting plate in the thickness direction, the arch comprises a plurality of bulges which are arranged on the connecting plate at intervals and are multiple, and the bulges penetrate through the plurality of layers of the lug in the height direction of the bulge, and the end face of the free end of the bulge is formed into a plane.

According to the connecting piece, the bulges with the plane top end surfaces are arranged on the connecting piece, the bulges are easy to pierce through multiple layers of lugs, welding energy is easy to penetrate through the connecting piece and the multiple layers of 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 reliability of a single battery is ensured, the failure rate is reduced, the safety coefficient of the single battery is improved, the use safety of the single battery is ensured, potential safety hazards are avoided, and the occurrence of dangerous accidents is reduced.

In some embodiments, the cross-sectional area of the protrusions is the same in the direction of the height of the protrusions.

In some embodiments, the cross-sectional area of the protrusion is no greater than 5mm²。

In some embodiments, the cross-sectional shape of the protrusion perpendicular to the protrusion height is circular, elliptical, or polygonal.

Further, a ratio of a cross-sectional area of the protrusion to a height of the protrusion is not more than 5.

Further, the cross-sectional shape of the projection is formed in a circular shape, and the radius of the projection is not more than 3 mm.

Further, the cross-sectional shape of the protrusion is formed in a square shape, and the side length of the cross section of the protrusion is not more than 3 mm.

Still further, a ratio between a side length of the convex section and a height of the protrusion is not more than 1.

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 view of the connector shown in FIG. 1;

fig. 3 is a schematic diagram of a battery cell according to an embodiment of the second aspect of the invention;

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

FIG. 5 is a schematic illustration of a top view of the connector shown in FIG. 4;

fig. 6 is a schematic diagram of a battery cell of another embodiment;

FIG. 7 is a schematic view of the connector shown in FIG. 6;

FIG. 8 is a schematic illustration of a top view of the connector shown in FIG. 7;

fig. 9 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 9, 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 9, 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. d, the supporting insulating layer 202113 is disposed between the first conductive layer 202111 and the 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 supporting 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. 1-9.

As shown in fig. 1, 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 1012 is arranged on the connecting plate 1011, the lug 1012 protrudes out of one side surface of the connecting plate 1011 in the thickness direction, the lug 1012 comprises a plurality of lugs 1012, the lugs 1012 are arranged on the connecting plate 1011 at intervals, the lugs 1012 penetrate through the multi-layer lug 20211, and the free end surface of the lug 1012 is formed into a plane in the height direction of the lug 1012.

That is, the multilayer tabs 20211 of the current collector 202 are electrically connected by the connector 101, the connector 101 has a connection plate 1011 and a projection 1012, the multilayer tabs 20211 are penetrated by the projection 1012, the projection 1012 is provided on one side surface of the connection plate 1011 in the thickness direction, the projection 1012 projects in the direction away from the connection plate 1011, the projection 1012 includes a plurality of projections 1012, the plurality of projections 1012 are provided at intervals on the connection plate 1011, the plurality of projections 1012 penetrate the multilayer tabs 20211, and the free end (e.g., the tip of the projection 1012 shown in fig. 4) of the projection 1012 is flat in the height direction (e.g., the up-down direction shown in fig. 4) of the projection 1012.

Referring to fig. a, the connection plate 1011 is formed in a horizontally extending plate body shape, the protrusions 1012 have a plurality of protrusions 1012 provided on the upper surface of the connection plate 1011, each protrusion 1012 is provided at regular intervals in the horizontal direction, and the plurality of protrusions 1012 are each protruded upward, each protrusion 1012 is provided at regular intervals in the horizontal direction, each protrusion 1012 penetrates the multi-layered tab 20211, and the tip of each protrusion 1012 in the up-down direction of each protrusion 1012 is formed in a flat surface. 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 protrusions 1012 with the plane top end surface are arranged on the connecting piece 101, the protrusions 1012 are easy to pierce through the multiple layers of tabs 20211, the welding energy is easy to penetrate through the connecting piece 101 and the multiple layers of tabs 20211, the welding difficulty of the tabs 20211 is reduced, the welding process of workers is simplified, the manufacturing working hours are reduced, the labor cost is reduced, the connection strength between the tabs 20211 and the connecting piece 101 is improved, the reliability of the battery monomer 1000 is ensured, the failure rate is reduced, the safety factor of the battery monomer 1000 is improved, the use safety of the battery monomer 1000 is ensured, the potential safety hazard is avoided, and the occurrence of dangerous accidents is reduced.

In some embodiments of the invention, the cross-sectional area of the protrusions 1012 is the same across the height of the protrusions 1012. Referring to fig. 4, the cross-sectional area of the protrusion 1012 is constant from bottom to top, so that the connection area between the protrusion 1012 and each layer of tab 20211 is substantially the same, and because the contact areas are different, parameters such as resistance and current between the tab 20211 and the protrusion 1012 are also different, thereby avoiding potential safety hazards.

In some embodiments of the invention, the cross-sectional area of the protrusions 1012 is no greater than 5mm 2. If the sectional area is too large, the protrusions 1012 are affected to pierce multiple layers of tabs 20211, welding energy is not easy to penetrate through the connecting piece 101 and the tabs 20211, the welding difficulty of the tabs 20211 and the connecting piece 101 is increased, and if the sectional area is too small, the effective contact area between each protrusion 1012 and each layer of tabs 20211 is reduced, and the use risk of the battery cell 1000 is increased.

For example, the cross-sectional area of protrusion 1012 may be: 5mm²、4.5mm²、4mm²、3.5mm²、3mm²、2.5mm²、2mm²、1.5mm²、1mm²、0.5mm²And so on. Therefore, the connection strength between the tab 20211 and the connecting piece 101 is ensured, the contact area between the tab 20211 and the connecting piece 101 is also ensured, the welding difficulty between the tab 20211 and the connecting piece is reduced, the failure rate is reduced, the use safety of the battery pack is ensured, and the potential safety hazard in the use process is avoided.

In some embodiments of the invention, the cross-sectional shape of the protrusions 1012 perpendicular to the protrusion height is circular, elliptical, or polygonal. When the cross-sectional shape of protrusion 1012 perpendicular to the protrusion height is circular, protrusion 1012 may be cylindrical; when the cross-sectional shape of the projection 1012 perpendicular to the projection height is an ellipse, the projection 1012 may be an elliptic cylinder; when the shape of a cross section of the protrusion 1012 perpendicular to the protrusion height is a polygon, the cross section may be a triangle, a quadrangle, a pentagon, a hexagon, or the like, and the protrusion 1012 may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, or the like.

In some embodiments of the invention, the ratio of the cross-sectional area of the protrusions 1012 to the height of the protrusions 1012 is no greater than 5. Therefore, the connection strength and the welding difficulty between the protrusion 1012 and the tab 20211 can be balanced, and the neglect of the welding difficulty for ensuring the connection strength between the protrusion 1012 and the tab 20211 or the neglect of the connection strength between the protrusion 1012 and the tab 20211 for reducing the welding difficulty can be avoided, so that the connection strength can be improved while the piercing effect of the protrusion 1012 is ensured.

For example, the ratio of the cross-sectional area of protrusion 1012 to the height of protrusion 1012 may be: 5. 4.5, 4, 3.5, 3, 2.5, 2, 1.5, 1, 0.5, etc.

In one embodiment of the present invention, the cross-sectional shape of the protrusions 1012 is formed in a circular shape, and the radius of the protrusions 1012 is not more than 3 mm. For example, the radius of protrusion 1012 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 another embodiment of the present invention, the cross-sectional shape of the protrusions 1012 is formed in a square shape, and the side length of the cross-section of the protrusions 1012 is not more than 3 mm. For example, the side length of the cross-section of protrusion 1012 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 one embodiment of the invention, the ratio between the side length of the cross-section of the protrusions 1012 and the height of the protrusions 1012 is no greater than 1. For example, the ratio between the side length of the cross-section of the protrusion 1012 and the height of the protrusion 1012: 1. 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 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 some embodiments, the connection plate 1011 is made of the same material as the protrusion 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.

Referring to fig. 7, 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.

A connector 101 according to one embodiment of the present invention will be described with reference to fig. 1-9.

Referring to fig. 2, the connector 101 has a connection plate 1011 and a protrusion 1012, the protrusion 1012 protrudes upward from the upper surface of the connection plate 1011, and the protrusion 1012 is arranged in a matrix on the upper surface of the connection plate 1011, the thickness of the connection plate 1011 is 0.8mm, the length L of the protrusion 1012 is 13mm, the width d of the protrusion 1012 is 0.6mm, the height of the protrusion 1012 is 0.6mm, the cross-sectional area of the protrusion 1012 in the up-down direction is the same, the protrusion 1012 extends in a straight line on the upper surface of the connection plate 1011, and the connection plate 1011 and the protrusion 1012 are integrally formed.

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.