CN217691564U - Current collector assembly, battery monomer and battery pack - Google Patents

Abstract

The utility model discloses a mass flow body subassembly, battery monomer and battery package, the mass flow body subassembly includes: 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 utility model discloses a current collector assembly sets up on current collector assembly through the arch that will have the section of puncturing, and the end of puncturing easily pierces through multilayer utmost point ear, and welding energy easily pierces through connecting piece and multilayer utmost point ear, has reduced the welding degree of difficulty of utmost point ear.

Description

Current collector assembly, battery monomer and battery pack

Technical Field

The utility model belongs to the technical field of the battery technique and specifically relates to a mass flow body subassembly, battery monomer and battery package are related to.

Background

In the related art, copper foils are welded on two sides of the composite tab in an ultrasonic roll welding mode through the single-layer tab, and the welded copper foils are welded on the 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.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a mass flow body subassembly, battery monomer and battery package lie in providing, mass flow body subassembly design benefit can reduce the protection arch and avoid impaired.

The utility model discloses still provide a battery monomer.

The utility model also provides a battery package.

According to the utility model discloses current collector assembly of first aspect 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; one of the connecting plate and the protective 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 protective 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 utility model discloses a current collector assembly sets up on current collector assembly through the arch that will have the puncture section, and the end of puncturing easily pierces through multilayer utmost point ear, and welding energy easily pierces through connecting piece and multilayer utmost point ear, has reduced the welding degree of difficulty of utmost point ear, has simplified workman's welding process, has reduced the preparation man-hour, has reduced the cost of labor, sets up and covers bellied protection shield, has avoided bellied top to surpass the visor to avoid the arch to receive the damage, the life of current collector assembly has been 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 tab.

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 projection, and the apex angle of the piercing section is no greater than 120 °.

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

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 includes a plurality of pole pieces arranged in a stack, the pole pieces including 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.

According to the utility model discloses battery monomer of second aspect, include the utility model discloses the current collector subassembly of above-mentioned first aspect.

According to the utility model discloses a battery monomer is applied to battery monomer through the mass flow body group spare that will set up above-mentioned first aspect to reduce the free assembly degree of difficulty of battery, reduced the free preparation man-hour of battery, reduced the cost of labor, guaranteed the free reliability of battery.

According to the utility model discloses the battery package of third aspect, include according to the utility model discloses the battery monomer of above-mentioned second aspect.

According to the utility model discloses a battery package is through setting up the battery monomer of above-mentioned second aspect to promote the security performance of battery package, guaranteed the reliability of battery package, avoided dangerous emergence.

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 present invention in a first aspect;

fig. 2 is a schematic illustration 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 section and a piercing section;

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 particular 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 are as follows:

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

protrusion 1012, connecting section 10121, piercing section 10122,

the current collector assembly 200, the protective plate 201,

the current collector 202, the pole piece 2021, the tab 20211,

a first conductive layer 202111, a second conductive layer 202112, a supporting insulating 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 reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present 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. 1-31.

As shown in fig. 1 to 31, a current collector assembly 200 according to an embodiment 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 comprises a multilayer tab 20211, the multilayer tab 20211 is arranged in a stacked manner in the thickness direction of the tab 20211, the conductive connection assembly 100 comprises a protective plate 201 and a connecting plate 1011, the protective plate 201 is arranged on one side of the multilayer tab 20211 in the thickness direction, the connecting plate 1011 is arranged on the other side of the multilayer tab 20211 in the thickness direction, one of the connecting plate 1011 and the protective plate 201 is provided with a protrusion 1012, the protrusion 1012 comprises a connecting section 10121 and a puncturing section 10122 which are connected in the height direction, one end of the connecting section 10121 is connected with the connecting plate 1011 or the protective plate 201, the puncturing section 10122 is connected to the other end of the connecting section 10121, the puncturing section 10122 is configured to puncture the multilayer tab 20211, and the protrusion 1012 is electrically connected with the multilayer 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 utility model discloses current collector assembly 200, set up on current collector assembly 200 through protruding 1012 that will have puncture section 10122, the end of stabbing easily pierces through multilayer utmost point ear 20211, welding energy easily pierces through connecting piece 101 and multilayer utmost point ear 20211, the welding degree of difficulty of utmost point ear 20211 has been reduced, workman's welding process has been simplified, the preparation man-hour has been reduced, the cost of labor has been reduced, set up the protection shield 201 that covers protruding 1012, the top of having avoided protruding 1012 exceeds the visor, thereby it receives the damage to have avoided protruding 1012, the life of current collector assembly 200 has been prolonged.

In some embodiments of the present invention, the cross-sectional area of the connecting section 10121 is the same, and the connecting section 10121 is electrically connected to the multilayer 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 through 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 cone 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 2.5mm.

In some embodiments of the present invention, the protrusion 1012 extends along 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 penetrating 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 prismatic. The protrusion 1012 with the triangular cross section can easily 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 between the tab 20211 and the connector 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 as a triangle, 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 prismatic, puncture section 10122 still can be the round platform, the lower bottom of arch 1012 links to each other with connecting piece 101, the upper bottom of arch 1012 is less than the lower bottom of arch 1012, the effect of impaling of arch 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 effect of impaling of arch 1012, further reduce 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 5mm. 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 present 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.

The utility model discloses an in some embodiments, arch 1012 locates on the connecting plate 1011, and arch 1012 passes behind the multilayer utmost point ear 20211 and links to each other with protection shield 201, arch 1012 can with connecting plate 1011 integrated into one piece, thus, the spare part quantity of current collector subassembly 200 has been reduced, the holistic joint strength of current collector subassembly 200 has been improved, the connection stability of arch 1012 and utmost point ear 20211 has been promoted, the defective rate of current collector subassembly 200 has been reduced, the life of current collector subassembly 200 has been prolonged.

The utility model discloses an in other embodiments, connecting plate 1011 and protruding 1012 adopt the components of a whole that can function independently to set up, and protruding 1012 passes through the welding, bonds, pegs graft or joint on connecting plate 1011, and like this, connecting plate 1011 is two independent parts with protruding 1012, has reduced the production degree of difficulty of current collector subassembly 200, has reduced current collector subassembly 200's manufacturing cost, has improved the fault-tolerant rate in protruding 1012 and utmost point ear 20211 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 attached to the connection plate 1011 by 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, in the height direction of the protrusion 1012, the cross-sectional area of the piercing section 10122 is gradually reduced, 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 2mm. 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 guaranteed, 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 3mm. 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 are in smooth 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 include a plurality of protrusions 1012 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 density of the plurality of protrusions 1012 arranged in the direction perpendicular to the ultrasonic vibration direction is less than the density of the plurality of protrusions arranged in other directions than the direction perpendicular to the ultrasonic vibration direction. 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, the distance between two adjacent protrusions 1012 in the ultrasonic vibration direction is L1, and the distance between two adjacent protrusions 1012 in the perpendicular to the ultrasonic vibration direction is L2, where 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 L1 is more than or equal to L2. 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 pitch 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, the plurality of protrusions 1012 extend in the ultrasonic vibration direction on the surface of the connection plate 1011 and are spaced apart in the direction perpendicular to the ultrasonic vibration direction. 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 arranged at intervals in the direction perpendicular to the vibration direction of the ultrasonic waves, and the protrusions 1012 are formed in a strip shape, so that the contact area between the tab 20211 and the protrusions 1012 is increased, the insecure welding between the tab 20211 and the protrusions 1012 is avoided, and the connection strength between the tab 20211 and the connection member 101 is improved.

In some embodiments of the present invention, the distance L2 between two adjacent protrusions 1012 is not less than the width d of the protrusions 1012 in the direction perpendicular to the ultrasonic vibration. That is, the pitch 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 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, the length of the protrusion 1012 in the ultrasonic vibration direction is L, and the width of the protrusion 1012 in the direction perpendicular to the ultrasonic vibration direction is d, wherein L and d satisfy: l + 2 d + 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 not be 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 present invention, the connection plate 1011 is made of the same material as the protrusion 1012. Because the materials are different, the temperature resistance, the resistance and other parameters of the conductors are different, so that great potential safety hazards exist, and the reliability of the battery cell 1000 is ensured, the failure rate is reduced, the use safety of the battery pack is also ensured, and accidents are avoided by using the same materials.

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

In some embodiments, the tab 20211 includes: a supporting 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 supporting insulating layer 202113, respectively. Referring to fig. 31, the supporting insulating layer 202113 is located 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.

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

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

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

According to the present invention, the battery cell 1000 according to the second aspect of the present invention includes the current collector assembly 200 according to the first aspect of the present invention.

According to the utility model discloses battery monomer 1000, the current collector subassembly 200 through setting up above-mentioned first aspect embodiment is applied to battery monomer 1000 to reduce battery monomer 1000's the assembly degree of difficulty, reduced battery monomer 1000's preparation man-hour, reduced the cost of labor, guaranteed battery monomer 1000's reliability.

According to the utility model discloses battery package of third aspect embodiment, include according to the utility model discloses the battery cell 1000 of above-mentioned second aspect embodiment.

According to the utility model discloses battery package through setting up the battery cell 1000 of the embodiment of the above-mentioned second aspect to promote the security performance of battery package, guaranteed the reliability of battery package, avoided dangerous emergence.

In the description of the present invention, it is to be understood that the terms "center", "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, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present 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 limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; 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 meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

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 present 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 (11)

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;

one of the connecting plate and the protective 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 protective 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 along 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 penetrating segments perpendicular to the extending 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 of claims 1-9.

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

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