CN113422168A

CN113422168A - Current collector assembly, battery monomer and battery pack

Info

Publication number: CN113422168A
Application number: CN202110798222.2A
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 current collector assembly, a battery monomer and a battery pack, wherein the current collector assembly comprises: the current collector comprises a plurality of layers of lugs, the conductive connecting assembly comprises a protection plate and a connecting plate, the protection plate is arranged on one side of the plurality of layers of lugs in the thickness direction, and the connecting plate is arranged on the other side of the plurality of layers of lugs in the thickness direction; the connecting plate is provided with a plurality of connecting plates, the protecting plate is provided with a plurality of connecting plates, the connecting plates are connected with the protecting plate through the connecting plates, and the protecting plate is provided with a plurality of connecting plates. According to the current collector assembly, the bulge with the puncture section is arranged on the current collector assembly, the puncture end is easy to puncture the multilayer tabs, welding energy is easy to penetrate through the connecting piece and the multilayer tabs, and the welding difficulty of the tabs is reduced.

Description

Current collector assembly, battery monomer and battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a current collector assembly, 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. After welding, the welded portion is easily damaged.

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 current collector assembly, a battery monomer and a battery pack, wherein the current collector assembly is ingenious in design and can reduce and protect projections from being damaged.

The invention also provides a battery monomer.

The invention also provides a battery pack.

The current collector assembly according to the first aspect of the present invention includes: the current collector comprises a plurality of layers of tabs which are arranged in a stacking mode in the thickness direction of the tabs; the conductive connecting assembly comprises a protective plate and a connecting plate, the protective plate is arranged on one side of the multilayer lug in the thickness direction, and the connecting plate is arranged on the other side of the multilayer lug in the thickness direction; the protection plate is characterized in that one of the connecting plate and the protection plate is provided with a protrusion, the protrusion comprises a connecting section and a puncturing section which are connected in the height direction, one end of the connecting section is connected with the connecting plate or the protection plate, the puncturing section is connected to the other end of the connecting section, the puncturing section is suitable for puncturing the multilayer tabs, and the protrusion is electrically connected with the multilayer tabs.

According to the current collector assembly, the bulge with the puncture section is arranged on the current collector assembly, the puncture end is easy to puncture the multilayer tabs, welding energy is easy to penetrate through the connecting piece and the multilayer tabs, the welding difficulty of the tabs is reduced, the welding process of workers is simplified, the manufacturing working hours are reduced, the labor cost is reduced, the protection plate covering the bulge is arranged, the top of the bulge is prevented from exceeding the protection cover, the bulge is prevented from being damaged, and the service life of the current collector assembly is prolonged.

In some embodiments, the connection segments have the same cross-sectional area, and the connection segments are electrically connected to the plurality of layers of the tabs.

In some embodiments, the piercing section is formed in a cone shape or a truncated cone shape.

In some embodiments, the protrusion extends along a straight line and/or a curved line on the surface of the connection plate or the protection plate, and a cross section of the piercing section perpendicular to the extending direction of the protrusion is formed in a triangle or a trapezoid.

In some embodiments, the cross-sectional area of the piercing section decreases gradually in the height direction of the protrusion, and the apex angle of the piercing section is not more than 120 °.

Further, the height of the piercing section in the height direction of the protrusion is not more than 2 mm.

Further, the connecting section and the puncturing section are in smooth transition.

Still further, the protrusions include a plurality of protrusions arranged in a matrix.

Still further, the current collector comprises a plurality of pole pieces arranged in a stacked manner, wherein the pole pieces comprise the pole lugs; the pole piece includes: 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 cell according to a second aspect of the invention includes the current collector assembly of the above first aspect of the invention.

According to the single battery, the current collector assembly provided with 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.

A battery pack according to a third aspect of the present invention includes the battery cell according to the above-described second aspect of the present invention.

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 current collector assembly according to an embodiment of the first aspect of the present invention;

fig. 2 is a schematic of a side view of the current collector 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 of a side view of the current collector 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 current collector assembly shown in fig. 19;

FIG. 21 is a schematic view of the connector shown in FIG. 19;

FIG. 22 is a schematic illustration of a top view of the connector shown in FIG. 20;

fig. 23 is a schematic view of a battery cell of another embodiment;

fig. 24 is a schematic view of the current collector assembly shown in fig. 23;

FIG. 25 is a schematic view of the connector shown in FIG. 23;

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

fig. 27 is a schematic view of a battery cell of yet another embodiment;

fig. 28 is a schematic view of the current collector assembly shown in fig. 27;

FIG. 29 is a schematic view of the connector shown in FIG. 27;

FIG. 30 is a schematic illustration of a top view of the connector shown in FIG. 29;

fig. 31 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 connecting section 10121, the piercing section 10122,

the current collector assembly 200, 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.

A current collector assembly 200 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 31.

As shown in fig. 1 to 31, a current collector assembly 200 according to an embodiment of the first aspect of the present invention includes: a current collector 202 and a conductive connection assembly 100.

Specifically, the current collector assembly 200 includes: the current collector 202 and the conductive connection assembly 100, the current collector 202 comprises a multi-layer tab 20211, the multi-layer tab 20211 is arranged in a stacked manner in a thickness direction of the tab 20211, the conductive connection assembly 100 comprises a protection plate 201 and a connection plate 1011, the protection plate 201 is arranged on one side of the multi-layer tab 20211 in the thickness direction, the connection plate 1011 is arranged on the other side of the multi-layer tab 20211 in the thickness direction, one of the connection plate 1011 and the protection plate 201 is provided with a protrusion 1012, the protrusion 1012 comprises a connection section 10121 and a puncture section 10122 which are connected in a height direction, one end of the connection section 10121 is connected with the connection plate 1011 or the protection plate 201, the puncture section 10122 is connected to the other end of the connection section 10121, the puncture section 10122 is configured to puncture the multi-layer tab 20211, and the protrusion 1012 is electrically connected with the multi-layer tab 20211.

That is, the multilayer tab 20211 is stacked in the thickness direction of the tab 20211, the protective plate 201 is provided on one side of the multilayer tab 20211 in the thickness direction, the connection plate 1011 is provided on the other side of the multilayer tab 20211 in the thickness direction, one end of the protrusion 1012 is connected to the connection plate 1011, the protrusion 1012 penetrates the multilayer tab 20211 and is electrically connected to the multilayer tab 20211, the other end of the protrusion 1012 is located inside the outer side surface of the protective plate 201, the protrusion 1012 may be formed on the connection plate 1011, the protrusion 1012 may also be formed on the protective plate 201, and the protrusion 1012 is electrically connected to the multilayer tab 20211.

The projection 1012 includes two portions: connecting segment 10121 and puncture section 10122, when protruding 1012 is formed on connecting plate 1011, the one end of connecting segment 10121 links to each other with connecting plate 1011, and the other end of connecting segment 10121 links to each other with puncture section 10122, and when protruding 1012 was formed on protection board 201, the one end of connecting segment 10121 linked to each other with protection board 201, and the other end of connecting segment 10121 links to each other with puncture section 10122. The piercing section 10122 is formed with a piercing end for piercing the multi-layer tab 20211.

Referring to fig. 2, the multi-layered tab 20211 is stacked vertically in the vertical direction, the protection plate 201 is located above the multi-layered tab 20211, the connection plate 1011 is located below the multi-layered tab 20211, and the protrusion 1012 and the tab 20211 are electrically connected. When the projection 1012 is formed on the connection plate 1011, the upper end of the projection 1012 is located in the lower side surface of the protection plate 201, and the projection 1012 includes two parts: connecting segment 10121 and puncture section 10122, the lower part of protruding 1012 is connecting segment 10121, the upper portion of protruding 1012 is puncture section 10122, connecting segment 10121 links to each other with the connecting plate 1011, the upper end at connecting segment 10121 is connected to puncture section 10122, when protruding 1012 is formed on protection board 201, the lower extreme of protruding 1012 is located the upper side surface of connecting plate 1011, the upper portion of protruding 1012 is connecting segment 10121, the lower part of protruding 1012 is puncture section 10122, connecting segment 10121 links to each other with protection board 201, the lower extreme at connecting segment 10121 is connected to puncture section 10122.

According to the current collector assembly 200 provided by the embodiment of the invention, the protrusion 1012 with the piercing section 10122 is arranged on the current collector assembly 200, the piercing end is easy to pierce through the multilayer tab 20211, the welding energy is easy to pierce through the connecting piece 101 and the multilayer tab 20211, the welding difficulty of the tab 20211 is reduced, the welding process of workers is simplified, the manufacturing time is reduced, the labor cost is reduced, the protection plate 201 covering the protrusion 1012 is arranged, the top of the protrusion 1012 is prevented from exceeding the protection cover, the protrusion 1012 is prevented from being damaged, and the service life of the current collector assembly 200 is prolonged.

In some embodiments of the invention, the connecting sections 10121 have the same cross-sectional area, and the connecting sections 10121 are electrically connected to the multi-layer tab 20211. Referring to fig. 5, in the up-down direction, the cross-sectional areas of the connecting sections 10121 are the same, the piercing sections 10122 of the protrusions 1012 are used for piercing the multi-layer tabs 20211, and the connecting sections 10121 of the protrusions 1012 are used for connecting the multi-layer tabs 20211, so that welding energy easily penetrates through the connecting piece 101 and the tabs 20211, the welding difficulty of the tabs 20211 and the connecting piece 101 is reduced, the manufacturing time is reduced, the connecting strength between the tabs 20211 and the connecting piece 101 is improved, the connection is stable, the piercing effect of the protrusions 1012 is guaranteed, and the connecting strength is improved.

In some embodiments of the present invention, the piercing section 10122 is formed in a conical shape or a truncated cone shape. That is, the piercing section 10122 may be in a conical shape, and the piercing section 10122 may also be in a truncated cone shape.

When the piercing section 10122 is formed as the conical protrusion 1012, the conical tip angle of the cone is greater than 5 ° and less than 150 °, which is more favorable for balancing the connection strength and the welding difficulty between the protrusion 1012 and the tab 20211, and avoids neglecting the welding difficulty for ensuring the connection strength between the protrusion 1012 and the tab 20211, or neglecting the connection strength between the protrusion 1012 and the tab 20211 for reducing the welding difficulty, thereby improving the connection strength while ensuring the piercing effect of the protrusion 1012.

For example, the cone apex angle of a cone may be: 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, and so on.

When the piercing section 10122 is formed as the circular truncated cone-shaped protrusion 1012, the ratio between the radius of the top surface and the radius of the bottom surface of the piercing section 10122 is not more than 0.6. That is, the top surface of the piercing section 10122 and the circumference of the piercing section 10122 have a certain angle, and the area of the top surface of the piercing section 10122 is smaller than the area of the bottom surface of the piercing section 10122. Therefore, the top surface of the protrusion 1012 is easy to pierce through the multi-layer tab 20211, so that the piercing effect of the protrusion 1012 is ensured, the melting of the protrusion 1012 in the welding process is reduced, and the reliability of the battery cell 1000 is improved.

For example, the ratio between the top surface radius and the bottom surface radius of the penetrating segment 10122 may be: 0.6, 0.55, 0.5, 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1, etc.

In some embodiments, the radius of the top surface of the penetrating segment 10122 is no greater than 1.5mm, and the radius of the bottom surface of the penetrating segment 10122 is no greater than 2.5 mm.

In some embodiments of the present invention, the protrusion 1012 extends in a straight line and/or a curved line on the surface of the connection plate 1011 or the protection plate 201, and the cross section of the piercing section 10122 perpendicular to the extending direction of the protrusion 1012 is formed in a triangle or a trapezoid. That is, the protrusion 1012 may extend linearly on the surface of the connecting plate 1011, the protrusion 1012 may extend curvilinearly on the surface of the protective plate 201, the protrusion 1012 may extend linearly and then curvilinearly on the surface of the connecting plate 1011, or extend curvilinearly and then curvilinearly, or the protrusion 1012 may extend linearly and then curvilinearly on the surface of the protective plate 201, or extend curvilinearly and then rectilinearly. Therefore, the welding requirements of different composite current collectors 202 are met, and the application range of the connecting piece 101 is expanded.

Referring to fig. 29, 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.

When the piercing section 10122 is formed in a triangular shape in a cross section perpendicular to the extending direction, the angle of the piercing end is not more than 120 ° in the cross section. That is, the protrusions 1012 may be prism-shaped. The protrusion 1012 with the triangular cross section is easier to pierce through the multilayer tab 20211 of the current collector 202, the piercing effect of the protrusion 1012 can be ensured, the angle of the piercing end is not greater than 120 degrees, the piercing effect of the protrusion 1012 can be further ensured, and the welding difficulty of the tab 20211 and the connecting piece 101 is further reduced.

For example, in a cross section of the piercing section 10122 perpendicular to the extending direction, the angle of the piercing end may be: 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, and so on.

In other embodiments of the present invention, the cross-section in the extending direction of the protrusions 1012 is formed in a triangular shape, and the angle of the piercing end is not more than 120 ° in the cross-section. That is, protrusions 1012 may be pyramids, and protrusions 1012 may also be cones.

For example, in a cross section of the direction in which the piercing section 10122 extends, the angle of the piercing end may be: 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, and so on.

When the section of the puncture section 10122 perpendicular to the extending direction is formed into a trapezoid, the ratio of the upper bottom to the lower bottom of the section is not more than 0.6. That is to say, puncture section 10122 also can be prismatic table, puncture section 10122 also can be the round platform, and the lower bottom of protruding 1012 links to each other with connecting piece 101, and the upper bottom of protruding 1012 is less than the lower bottom of protruding 1012, and the piercing effect of protruding 1012 can be guaranteed, and the ratio of the upper bottom of cross-section and lower bottom is not more than 0.6, can further guarantee the piercing effect of protruding 1012, further reduces the welding degree of difficulty of utmost point ear 20211 and connecting piece 101.

For example, the ratio of the upper base to the lower base of the cross-section of protrusion 1012 may be: 0.6, 0.55, 0.5, 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1, etc.

In one embodiment, the upper base of the cross-section of protrusion 1012 is no greater than 3mm and the lower base of the cross-section of protrusion 1012 is no greater than 5 mm. For example, the upper base of the cross-section of protrusion 1012 may be: 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, and the like; the lower base of the cross section of the protrusions 1012 may be: 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5.0mm, and the like.

In some embodiments of the invention, the other end of the protrusion 1012 is connected to the protection plate 201. Referring to fig. 2, the upper end of the protrusion 1012 is connected to the protection plate 201, and the protrusion 1012 and the protection plate 201 may be connected by welding, bonding, clipping, plugging, and the like.

Further, the other end of the projection 1012 is fixed to the inner side surface of the protection plate 201. Referring to fig. 2, the upper ends of the protrusions 1012 are fixed to the lower side surface of the protection plate 201. Therefore, the connection strength of the tab 20211 and the protrusion 1012 is further improved, and the tab 20211 is prevented from being separated from the protrusion 1012, so that the structure of the current collector assembly 200 is more stable, the production yield of the current collector assembly 200 is ensured, the yield of the battery cell 1000 is improved, the danger of a battery pack is reduced, and the use is safer.

In some embodiments of the present invention, the protrusion 1012 is disposed on the connection plate 1011, and the protrusion 1012 is connected to the protection plate 201 after penetrating through the multi-layer tab 20211, and the protrusion 1012 and the connection plate 1011 may be integrally formed, so as to reduce the number of parts of the current collector assembly 200, improve the overall connection strength of the current collector assembly 200, improve the connection stability of the protrusion 1012 and the tab 20211, reduce the defective rate of the current collector assembly 200, and prolong the service life of the current collector assembly 200.

In other embodiments of the present invention, the connection plate 1011 and the protrusion 1012 are separately disposed, and the protrusion 1012 is welded, bonded, inserted, or clamped on the connection plate 1011, so that the connection plate 1011 and the protrusion 1012 are two independent components, which reduces the production difficulty of the current collector assembly 200, reduces the production cost of the current collector assembly 200, and improves the fault tolerance of the protrusion 1012 and the tab 20211 during the welding process.

Preferably, the protrusion 1012 is connected with the connecting plate 1011 by welding, the connection is simple, and the protrusion 1012 is firmly connected with the connecting plate 1011 and is not easy to damage.

Specifically, the protrusion 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.

Preferably, the plurality of protrusions 1012 are joined to the multi-layered tab 20211 by ultrasonic welding.

In some embodiments of the present invention, the cross-sectional area of the piercing section 10122 gradually decreases in the height direction of the protrusions 1012, and the apex angle of the piercing section 10122 is not greater than 120 °. Referring to fig. 4 and 5, in the up-down direction of the protrusion 1012, the cross-sectional area of the penetrating segment 10122 is gradually reduced from the bottom to the top, the cross-sectional area of the bottom surface of the penetrating segment 10122 is the largest, the cross-sectional area of the top of the penetrating segment 10122 is the smallest, the protrusion 1012 more easily pierces through the multi-layer tab 20211, the welding difficulty of the tab 20211 and the connecting member 101 is reduced, the welding time of the tab 20211 and the connecting member 101 is reduced, and the production efficiency is improved.

For example, the angle of the apex angle of the penetrating segment 10122 may be: 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, and so on.

Further, in the height direction of the projection 1012, the height of the piercing section 10122 is not more than 2 mm. For example, the height of the penetrating segment 10122 may be: 2mm, 1.8mm, 1.6mm, 1.4mm, 1.2mm, 1mm, 0.8mm, 0.6mm, 0.4mm, 0.2mm, and the like. Therefore, the piercing effect of the protrusions 1012 is ensured, the welding difficulty of the tab 20211 and the connecting piece 101 is reduced, the manufacturing time is reduced, and the welding efficiency is improved.

Further, in the height direction of the projection 1012, the height of the connecting section 10121 is not more than 3 mm. The height of the connecting section 10121 may be: 3mm, 2.8mm, 2.6mm, 2.4mm, 2.2mm, 2mm, 1.8mm, 1.6mm, 1.4mm, 1.2mm, 1mm, 0.8mm, 0.6mm, 0.4mm, 0.2mm, and the like. Therefore, the connection strength between the tab 20211 and the connector 101 is improved, the tab 20211 and the connector 101 are not easy to separate, and the yield is improved.

In some embodiments of the present invention, the connecting section 10121 and the piercing section 10122 smoothly transition. Because the tab 20211 and the protrusion 1012 generate friction during the welding process, the tab 20211 is not easily damaged by the protrusion 1012 smoothly transiting between the connecting section 10121 and the piercing section 10122, the service life of the tab 20211 is prolonged, the yield of the battery monomer 1000 is ensured, and the safety and reliability of the battery pack are improved.

In some embodiments of the present invention, the protrusions 1012 comprise a plurality, and the plurality of protrusions 1012 are arranged in a matrix. The plurality of protrusions 1012 arranged in the array improve the connection strength between the tab 20211 and the protrusions 1012, avoid the mutual separation between the tab 20211 and the protrusions 1012 in the transportation or use process, improve the yield of the battery cell 1000, increase the contact area between the protrusions 1012 and each layer of tab 20211, increase the flow area, achieve balanced heat dissipation, prevent the battery pack from easily breaking down, reduce the risk coefficient of a user, and improve the use experience of the user.

In some embodiments of the present invention, the plurality of protrusions 1012 are arranged more densely in the ultrasonic vibration direction than in other directions. That is, the plurality of protrusions 1012 protrude toward a direction away from the connection plate 1011, the plurality of protrusions 1012 are arranged in the ultrasonic vibration direction at the highest density, and the plurality of protrusions 1012 are arranged in a direction other than the ultrasonic vibration direction at a lower density 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.

In some embodiments of the present invention, the plurality of protrusions 1012 are arranged less densely in a direction perpendicular to the direction of the ultrasonic vibration than in other directions than perpendicular to the direction of the ultrasonic vibration. That is, the plurality of protrusions 1012 are arranged at the minimum density in the direction perpendicular to the ultrasonic vibration direction, and the plurality of protrusions 1012 are arranged at the maximum density in the ultrasonic vibration direction. Therefore, the welding speed between the tab 20211 and the connecting piece 101 is increased, the manufacturing working hours are reduced, the production cost is reduced, the multi-layer tab 20211 is easier to be pierced by the protrusion 1012, and the welding energy is easier to penetrate through the connecting piece 101 and the tab 20211.

Further, the plurality of protrusions 1012 are arranged in an array on the surface of the connection plate 1011, and the density of the arrangement of the plurality of protrusions 1012 is the greatest in the direction along the ultrasonic vibration and the density of the arrangement of the plurality of protrusions 1012 is the smallest in the direction perpendicular to the ultrasonic vibration. Here, it should be noted that when the density of the plurality of projections 1012 arranged in the ultrasonic vibration direction is sufficiently large, the projections 1012 are formed in a long strip shape extending in the ultrasonic vibration direction.

In some embodiments of the present invention, a distance between two adjacent protrusions 1012 in the ultrasonic vibration direction is L1, and a distance between two adjacent protrusions 1012 in the direction perpendicular to the ultrasonic vibration direction is L2, wherein L1 and L2 satisfy: l1 is more than or equal to 0.5mm and less than or equal to 10mm, L2 is more than or equal to 0.5mm and less than or equal to 10mm, and L2 is more than or equal to L1. That is, the pitch between two adjacent protrusions 1012 in the ultrasonic vibration direction is not larger than the pitch between two adjacent protrusions 1012 in the direction perpendicular to the ultrasonic vibration direction, that is, the density with which the plurality of protrusions 1012 are arranged in the direction perpendicular to the ultrasonic vibration direction is smaller than the density with which the plurality of protrusions 1012 are arranged in the ultrasonic vibration direction. Therefore, the welding speed is further improved, the production efficiency is improved, the production cost is reduced, the arrangement mode of the protrusions 1012 is optimized, the weak welding point between the tab 20211 and the connecting piece 101 is avoided, and the product quality is improved.

For example, the pitch L1 between two protrusions 1012 adjacent in the ultrasonic vibration direction may be: 0.5mm, 0.7mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, and the like. The interval L2 between two adjacent protrusions 1012 in the direction perpendicular to the ultrasonic vibration direction may be: 0.5mm, 0.7mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, and the like.

In one embodiment of the present invention, a plurality of protrusions 1012 extend in the ultrasonic vibration direction on the surface of the connection plate 1011 and are arranged at intervals in the direction perpendicular to the ultrasonic vibration. Referring to fig. 3, a plurality of protrusions 1012 extend along the vibration direction of the ultrasonic waves on the upper surface of the connection plate 1011 and are spaced apart in the direction perpendicular to the vibration direction of the ultrasonic waves, and the protrusions 1012 are formed in a long shape, so that the contact area between the tab 20211 and the protrusions 1012 is increased, the tab 20211 and the protrusions 1012 are prevented from being welded insecurely, and the connection strength between the tab 20211 and the connection member 101 is improved.

In some embodiments of the present invention, a distance L2 between adjacent two protrusions 1012 in a direction perpendicular to the direction of the ultrasonic vibration is not less than the width d of the protrusions 1012. That is, the spacing L2 between two adjacent protrusions 1012 in the direction perpendicular to the ultrasonic vibration direction is equal to or greater than the width d of the protrusion 1012, L2 may be equal to or greater than d, and L2 may also be equal to d. Therefore, the placing direction of the connecting plate 1011 during welding can be clearly distinguished, and the direction in which the distance between the protrusions 1012 is wider is placed in the direction perpendicular to the ultrasonic vibration direction, so that the production efficiency can be improved, and the welding between the protrusions 1012 and the tab 20211 can be firmer.

In some embodiments of the present invention, a length of the protrusion 1012 in the ultrasonic vibration direction is L, and a width of the protrusion 1012 perpendicular to the ultrasonic vibration direction is d, where L and d satisfy: l is 2+ d is 2 is more than or equal to X, and X is the width of the tab 20211. It is understood that the circumference of the protrusions 1012 should be no less than the width of the tab 20211. Here, the width X of the tab 20211 is a side length of the tab 20211 in a direction perpendicular to the ultrasonic vibration direction, and as shown in fig. 16, the length of the tab 20211 in the left-right direction is the width of the tab 20211.

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 tab 20211 includes: 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. 31, 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.

Optionally, the supporting insulating layer 202113 is a composite polymer insulating layer.

A current collector assembly 200 according to one embodiment of the present invention will be described with reference to fig. 1 to 31.

Referring to fig. 16, the protrusion 1012 is formed in a long bar shape, the current collector assembly 200 has the current collector 202 and the conductive connection assembly 100, the upper surface of the connection plate 1011 is provided with a plurality of protrusions 1012, and the plurality of protrusions 1012 extend in the ultrasonic vibration direction on the upper surface of the connection plate 1011, the thickness of the connection plate 1011 is 0.8mm, the height of the protrusion 1012 is 0.6mm, the distance L2 between two adjacent protrusions 1012 is 2.4mm, the height of the connection section 10121 of the protrusion 1012 is 0.4mm, the height of the penetration section 10122 of the protrusion 1012 is 0.2mm, the length L of the protrusion 1012 is 13mm, the width d of the protrusion 1012 is 0.6mm, the angle of the vertex angle of the penetration section 10122 is 67 °, the cross-sectional areas of the connection section 10121 in the up-down direction are the same, the cross-sectional area of the penetration section 10122 in the up-down direction is gradually reduced, the protrusion 1012 extends in a straight line on the upper surface of the connection plate 1011, the connection plate 1011 is integrally formed with the plurality of protrusions 1012, the tab 20211 has three layers, from top to bottom are respectively: a first conductive layer 202111, a second conductive layer 202112, and a supporting insulating layer 202113, a protective plate 201 is disposed over the multi-layered tab 20211, and the upper ends of the protrusions 1012 are connected to the protective plate 201.

A battery cell 1000 according to an embodiment of the second aspect of the present invention includes the current collector assembly 200 according to the above-described embodiment of the first aspect of the present invention.

According to the single battery 1000 of the embodiment of the invention, the current collector assembly 200 provided with the first aspect embodiment is applied to the single battery 1000, so that the assembly difficulty of the single battery 1000 is reduced, the manufacturing time of the single battery 1000 is reduced, the labor cost is reduced, and the reliability of the single battery 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 current collector assembly, comprising:

the current collector comprises a plurality of layers of tabs which are arranged in a stacking mode in the thickness direction of the tabs;

the conductive connecting assembly comprises a protective plate and a connecting plate, the protective plate is arranged on one side of the multilayer lug in the thickness direction, and the connecting plate is arranged on the other side of the multilayer lug in the thickness direction;

the protection plate is characterized in that one of the connecting plate and the protection plate is provided with a protrusion, the protrusion comprises a connecting section and a puncturing section which are connected in the height direction, one end of the connecting section is connected with the connecting plate or the protection plate, the puncturing section is connected to the other end of the connecting section, the puncturing section is suitable for puncturing the multilayer tabs, and the protrusion is electrically connected with the multilayer tabs.

2. The current collector assembly of claim 1, wherein the connecting segments have the same cross-sectional area and are electrically connected to the plurality of layers of tabs.

3. The current collector assembly of claim 1, wherein the piercing section is formed in a conical shape or a frustoconical shape.

4. The current collector assembly of claim 1, wherein the protrusions extend in a straight line and/or a curved line on the surface of the connection plate or the protection plate, and the cross section of the penetration section perpendicular to the extension direction of the protrusions is formed in a triangular shape or a trapezoidal shape.

5. The current collector assembly of claim 1, wherein the cross-sectional area of the penetrating segment gradually decreases in the height direction of the protrusion, and the apex angle of the penetrating segment is not greater than 120 °.

6. The current collector assembly of claim 1, wherein the height of the penetrating segments is no greater than 2mm in the height direction of the protrusions.

7. The current collector assembly of claim 1, wherein the connecting section and the piercing section smoothly transition.

8. The current collector assembly of claim 1, wherein the protrusions comprise a plurality of protrusions arranged in a matrix.

9. The current collector assembly of any one of claims 1-8, wherein the current collector comprises a plurality of pole pieces arranged in a stack, the pole pieces comprising the tab; the pole piece includes: 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.

10. A battery cell comprising the current collector assembly of any one of claims 1-9.

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