CN217691563U - 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 multilayer tabs are arranged in a stacking mode in the thickness direction of the tabs; the protection piece comprises a protection plate and a first bulge arranged on the protection plate, the protection plate is arranged on one side of the multilayer tabs in the thickness direction, and the first bulge penetrates through the multilayer tabs and is electrically connected with the multilayer tabs; the connecting piece comprises a connecting plate and a second bulge arranged on the connecting plate, the connecting plate is arranged on the other side of the multilayer lug in the thickness direction, and the second bulge penetrates through the multilayer lug and is electrically connected with the multilayer lug. According to the utility model discloses a current collector assembly through set up the arch simultaneously on protective part and connecting piece, has improved the joint strength between utmost point ear and the arch, has guaranteed bellied impaling effect, has increased the area of contact between arch and the utmost point ear, has reduced the fault rate, has guaranteed the free yields of battery, has also guaranteed the safety in utilization of battery package, has avoided the emergence of accident.

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 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.

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 current collector subassembly, battery monomer and battery package, current collector 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 multilayer tabs are arranged in a stacking mode in the thickness direction of the tabs; the protection piece comprises a protection plate and a first bulge arranged on the protection plate, the protection plate is arranged on one side of the multilayer lug in the thickness direction, and the first bulge penetrates through the multilayer lug and is electrically connected with the multilayer lug; the connecting piece, the connecting piece includes the connecting plate and locates the second of connecting plate is protruding, the connecting plate is established the opposite side of multilayer utmost point ear in thickness direction, the second is protruding to be passed the multilayer utmost point ear and with the multilayer utmost point ear electricity is connected.

According to the utility model discloses a mass flow body subassembly is through setting up the arch simultaneously on protective part and connecting piece, has further improved the joint strength between utmost point ear and the arch for it is firm to connect, has guaranteed bellied impaling effect, has increased the area of contact between arch and the utmost point ear, has stabilized the reliability of conductive connection, has reduced the fault rate, has guaranteed the free yields of battery, has also guaranteed the safety in utilization of battery package, has avoided the emergence of accident.

In some embodiments, the first protrusion includes a plurality of first protrusions spaced apart in a plane in which the protection plate is located, and the second protrusion includes a plurality of second protrusions spaced apart in a plane in which the connection plate is located.

In some embodiments, a second protrusion is disposed between at least one group of two adjacent first protrusions, or a first protrusion is disposed between at least one group of two adjacent second protrusions, in a plane perpendicular to the thickness direction of the tab.

In some embodiments, the first protrusions and the second protrusions are arranged alternately in a plane perpendicular to the thickness direction of the tab.

In some embodiments, the first protrusion penetrates through the plurality of layers of the tabs and is connected with the connecting plate, and the second protrusion penetrates through the plurality of layers of the tabs and is connected with the protective plate.

In some embodiments, the surface of the connecting plate deviating from the tab in the thickness direction is a first surface, the surface of the protection plate deviating from the tab in the thickness direction is a second surface, and both ends of the first protrusion in the thickness direction of the tab and both ends of the second protrusion in the thickness direction of the tab are located inside the first surface and inside the second surface.

Further, any one of the first projection and the second projection includes: the connecting plate is connected with the connecting plate or the protective plate, the connecting plate is connected with the protective plate, and the connecting plate is connected with the protective plate.

Further, the cross-sectional areas of the connecting sections are the same, and the connecting sections are electrically connected with the multiple layers of tabs.

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.

According to the utility model discloses battery cell of second aspect, include the utility model discloses the mass flow body group spare of above-mentioned first aspect.

According to the utility model discloses a battery monomer is applied to battery monomer through the mass flow body subassembly that will set up above-mentioned first aspect to reduced 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 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 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;

fig. 32 is a schematic view of a current collector assembly in which first protrusions are formed on a protective plate;

fig. 33 is a schematic of a side view of the current collector assembly shown in fig. 32;

fig. 34 is a schematic view of the protection plate shown in fig. 33.

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 length of the first projection 31, the second projection 32,

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 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. 1-34.

As shown in fig. 1 to 34, a current collector assembly 200 according to an embodiment of the present invention includes: a multi-layer tab 20211, a protector and a connector 101.

Specifically, the multilayer tab 20211 is arranged in a stacked manner in the thickness direction of the tab 20211, the protective member includes a protective plate 201 and a first projection 31 provided on the protective plate 201, the protective plate 201 is provided on one side of the multilayer tab 20211 in the thickness direction, the first projection 31 penetrates the multilayer tab 20211 and is electrically connected to the multilayer tab 20211, the connecting member 101 includes a connecting plate 1011 and a second projection 32 provided on the connecting plate 1011, the connecting plate 1011 is provided on the other side of the multilayer tab 20211 in the thickness direction, and the second projection 32 penetrates the multilayer tab 20211 and is electrically connected to the multilayer tab 20211.

That is, the first protrusion 31 is located on the protective plate 201, the second protrusion 32 is located on the connecting plate 1011, the first protrusion 31 and the second protrusion 32 both pierce the multi-layer tab 20211 and are electrically connected to the multi-layer tab 20211, the first protrusion 31 pierces the multi-layer tab 20211 and is connected to the connecting plate 1011, the second protrusion 32 pierces the multi-layer tab 20211 and is connected to the protective plate 201, and the protective plate 201 and the connecting plate 1011 are respectively located on both sides of the multi-layer tab 20211 in the thickness direction.

According to the utility model discloses current collector assembly 200, through set up protruding 1012 simultaneously on protector and connecting piece 101, the joint strength between utmost point ear 20211 and the protruding 1012 has further been improved, make the connection firm, the impaling effect of protruding 1012 has been guaranteed, increased the area of contact between protruding 1012 and the utmost point ear 20211, the reliability of conductive connection has been stabilized, the fault rate has been reduced, battery monomer 1000's yields has been guaranteed, the safety in utilization of battery package has also been guaranteed, the emergence of accident has been avoided.

In some embodiments of the present invention, the first protrusions 31 include a plurality of first protrusions 31, the plurality of first protrusions 31 are spaced apart from each other in the plane of the protection plate 201, the second protrusions 32 include a plurality of second protrusions 32, and the plurality of second protrusions 32 are spaced apart from each other in the plane of the connection plate 1011. That is, the plurality of first protrusions 31 are arranged at intervals on the side surface of the protection plate 201 facing the connection plate 1011, the plurality of second protrusions 32 are arranged at intervals on the side surface of the connection plate 1011 facing the protection plate 201, and the first protrusions 31 and the second protrusions 32 are provided on the protection member and the connection member 101, respectively, ensuring the connection stability between the tab 20211 and the protrusions 1012.

Further, first arch 31 is located on protection shield 201, and first arch 31 passes behind the multilayer utmost point ear 20211 and links to each other with connection plate 1011, first arch 31 can with protection shield 201 integrated into one piece, second arch 32 is located on connection plate 1011, and second arch 32 passes behind the multilayer utmost point ear 20211 and links to each other with protection shield 201, second arch 32 can with connection 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 stability of being connected of protruding 1012 with 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.

Alternatively, the first protrusion 31 and the second protrusion 32 are respectively welded, adhered, plugged or clamped on the protection plate 201 and the connection plate 1011.

The ultrasonic welding has the advantages of high welding speed, high welding strength, good sealing property, replacement of the traditional welding/bonding process, low cost, cleanness, no pollution, no damage to the soft connecting sheet and the tab 20211, stable welding process, good conductivity after welding, extremely low or nearly zero resistance coefficient, short welding time, no need of any scaling powder, gas and welding flux, no spark in the welding process, environmental protection and safety. It is further preferable that the first protrusion 31 and the second protrusion 32 are respectively welded to the protection plate 201 and the connection plate 1011 by ultrasonic waves having a vibration frequency in a range of 15KHz to 40KHz, an amplitude in a range of 5um to 100um, a welding pressure of the ultrasonic waves is not less than 20N, and a welding time is not less than 30ms.

In some embodiments of the present invention, in a plane perpendicular to the thickness direction of the tab 20211, a second protrusion 32 is disposed between at least one set of two adjacent first protrusions 31, or a first protrusion 31 is disposed between at least one set of two adjacent second protrusions 32. That is, in a plane perpendicular to the thickness direction of the tab 20211, one second protrusion 32 may be disposed between one set of two first protrusions 31, two second protrusions 32 may be disposed between one set of two first protrusions 31, one first protrusion 31 may be disposed between one set of two second protrusions 32, two first protrusions 31 may be disposed between one set of two second protrusions 32, and the like, and in other embodiments, a plurality of sets may be disposed.

In some embodiments of the present invention, the first protrusions 31 and the second protrusions 32 are staggered in a plane perpendicular to the thickness direction of the tab 20211. For example, one first protrusion 31 and one second protrusion 32 may be arranged in a staggered manner, two first protrusions 31 and two second protrusions 32 may be arranged in a staggered manner, three first protrusions 31 and three second protrusions 32 may be arranged in a staggered manner, and the like have a certain regularity, so that stable connection between the tab 20211 and the protrusion 1012 can be ensured, the reliability of conductive connection is improved, and the failure rate of the battery cell 1000 is reduced.

In some embodiments of the present invention, the first protrusion 31 is connected to the connection plate 1011 after passing through the multi-layer tab 20211, and the second protrusion 32 is connected to the protection plate 201 after passing through the multi-layer tab 20211. That is, the upper end of the first projection 31 is connected to the protection plate 201, the lower end of the first projection 31 is connected to the connection plate 1011, the upper end of the second projection 32 is connected to the protection plate 201, and the lower end of the second projection 32 is connected to the connection plate 1011. Like this, first arch 31 and second arch 32 link to each other with connecting plate 1011 and protection shield 201 respectively simultaneously, have guaranteed that current collector subassembly 200 is connected firmly, have improved battery monomer 1000's yields, and are economical and reliable.

In some embodiments of the present invention, the surface of the connecting plate 1011 facing away from the tab 20211 in the thickness direction is a first surface, the surface of the protecting plate 201 facing away from the tab 20211 in the thickness direction is a second surface, and both ends of the first protrusion 31 in the thickness direction of the tab 20211 and both ends of the second protrusion 32 in the thickness direction of the tab 20211 are located at the inner side of the first surface and the inner side of the second surface. In short, the first projection 31 and the second projection 32 are both located between the connecting plate 1011 and the protective plate 201.

In some embodiments of the present invention, any one of the first protrusion 31 and the second protrusion 32 includes: a connecting section 10121 and a piercing section 10122 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 piercing section 10122 is connected with the other end of the connecting section 10121, and the piercing section 10122 is configured to pierce through the multi-layer tab 20211. That is, the first protrusion 31 may include the connecting section 10121 and the penetrating section 10122 connected in the height direction, the second protrusion 32 may include the connecting section 10121 and the penetrating section 10122 connected in the height direction, and both the first protrusion 31 and the second protrusion 32 may include the connecting section 10121 and the penetrating section 10122 connected in the height direction.

When the first protrusion 31 includes the connection section 10121 and the piercing section 10122 connected in the height direction, the lower end of the first protrusion 31 is located on the upper surface of the connection plate 1011, the upper portion of the first protrusion 31 is the connection section 10121, the lower portion of the first protrusion 31 is the piercing section 10122, the connection section 10121 is connected with the protection plate 201, the piercing section 10122 is connected to the lower end of the connection section 10121, the piercing section 10122 is formed with a piercing end, and the piercing end is used for piercing the multi-layer tab 20211.

When second protrusion 32 includes linkage segment 10121 and puncture section 10122 that link to each other in the direction of height, the upper end of second protrusion 32 is located the below surface of protection plate 201, the lower part of second protrusion 32 is linkage segment 10121, the upper portion of second protrusion 32 is puncture section 10122, linkage segment 10121 links to each other with the connecting plate 1011, puncture section 10122 is connected in the upper end of linkage segment 10121, puncture section 10122 is formed with the puncture end, the puncture end is used for impaling multilayer utmost point ear 20211.

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 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 the 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 top surface of the penetrating segment 10122 has a radius no greater than 1.5mm and the bottom surface of the penetrating segment 10122 has a radius 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 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 puncture tip 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 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, in the height direction of the protrusions 1012, the cross-sectional area of the piercing section 10122 gradually decreases, and the apex angle of the piercing section 10122 is not more than 120 °. Referring to fig. 5, in the up-down direction of the protrusion 1012, the sectional area of the penetrating segment 10122 is gradually reduced from the bottom to the top, the sectional area of the bottom surface of the penetrating segment 10122 is the largest, the sectional area of the top of the penetrating segment 10122 is the smallest, the protrusion 1012 is more likely to pierce through the multi-layer tab 20211, the welding difficulty of the tab 20211 and the connecting piece 101 is reduced, the welding time of the tab 20211 and the connecting piece 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 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 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 is not easily separated from the connector 101, 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 smooth transition protrusion 1012 of the connection section 10121 and the puncture 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 tabs 20211 and the protrusions 1012, avoid the mutual separation of the tabs 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 tabs 20211, increase the flow area, balance the heat dissipation, prevent the battery pack from easily breaking down, reduce the risk coefficient of a user, and improve the use feeling 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 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, 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 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 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 present 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, or the like.

In other embodiments, the conductive connection assembly 100 includes: a connecting plate 1011 and a protrusion 1012, the connecting member 101 being adapted to be connected to a multi-layer tab 20211 of the current collector 202 by ultrasonic welding, the connecting member 101 comprising: the connecting plate 1011 and the protrusion 1012 arranged on the connecting plate 1011, the protrusion 1012 protrudes out of one side surface of the connecting plate 1011 in the thickness direction, the protrusion 1012 comprises a plurality of protrusions 1012, and the plurality of protrusions 1012 penetrate through the multi-layer tab 20211.

In some embodiments, the tab 20211 includes: a support insulating layer 202113 and a first conductive layer 202111 and a second conductive layer 202112 covering the surface of the support insulating layer 202113 in the thickness direction, respectively. Referring to fig. 31, the support 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 overlie the upper and lower surfaces, respectively, of the support insulating layer 202113.

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

A current collector assembly 200 according to an embodiment of the present invention is described in detail below with reference to fig. 1-34.

Specifically, first protrusion 31 and second protrusion 32 are both formed in a long strip shape, current collector assembly 200 has multiple layers of tabs 20211, protection member and connecting member 101, be equipped with first protrusion 31 on protection plate 201, be equipped with second protrusion 32 on connecting plate 1011, the thickness of connecting plate 1011 is 0.8mm, the length L of second protrusion 32 is 13mm, the width d of second protrusion 32 is 0.6mm, the height of linkage segment 10121 second of protrusion 1012 is 0.4mm, the height of puncture segment 10122 of second protrusion 32 is 0.2mm, the angle of the apex angle of puncture segment 10122 is 67 °, linkage segment 10121 is the same in cross-sectional area in the up direction, the cross-sectional area of puncture segment 10122 in the up direction from the bottom is gradually reduced, protrusion 1012 extends along a straight line on the upper surface of connecting plate 1011, connection plate 1011 is formed integrally with multiple second protrusions 32, protection plate 201 is formed integrally with multiple first protrusions 31, tabs 20211 has three layers, from top to bottom are: a first conductive layer 202111, a second conductive layer 202112 and a supporting insulating layer 202113, a protective plate 201 is provided above the multi-layered tab 20211, and a first projection 31 and a second projection 32 are connected to the connection plate 1011 and the protective plate 201, respectively.

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 expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled 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 multilayer tabs are arranged in a stacking mode in the thickness direction of the tabs;

the protection piece comprises a protection plate and a first bulge arranged on the protection plate, the protection plate is arranged on one side of the multilayer tab in the thickness direction, and the first bulge penetrates through the multilayer tab and is electrically connected with the multilayer tab;

the connecting piece, the connecting piece includes the connecting plate and locates the second of connecting plate is protruding, the connecting plate is established the opposite side of multilayer utmost point ear in thickness direction, the second is protruding to be passed the multilayer utmost point ear and with the multilayer utmost point ear electricity is connected.

2. The current collector assembly of claim 1, wherein the first protrusions comprise a plurality of first protrusions spaced apart in a plane in which the protection plate is located, and the second protrusions comprise a plurality of second protrusions spaced apart in a plane in which the connection plate is located.

3. The current collector assembly as claimed in claim 2, wherein a second protrusion is disposed between at least one set of two adjacent first protrusions or a first protrusion is disposed between at least one set of two adjacent second protrusions in a plane perpendicular to the thickness direction of the tab.

4. The current collector assembly of claim 3, wherein the first plurality of protrusions and the second plurality of protrusions are staggered in a plane perpendicular to the thickness direction of the tab.

5. The current collector assembly as claimed in claim 1, wherein the first protrusions penetrate through the plurality of layers of the tabs and are connected to the connection plate, and the second protrusions penetrate through the plurality of layers of the tabs and are connected to the protection plate.

6. The current collector assembly of claim 5, wherein the surface of the connecting plate facing away from the tab in the thickness direction is a first surface, the surface of the protective plate facing away from the tab in the thickness direction is a second surface, and both ends of the first protrusion in the thickness direction of the tab and both ends of the second protrusion in the thickness direction of the tab are located inside the first surface and inside the second surface.

7. The current collector assembly of any of claims 1-6, wherein any of the first and second protrusions comprises: the connecting plate or the protective plate is connected with the connecting plate or the protective plate, the puncture section is connected with the other end of the connecting plate, and the puncture section is suitable for puncturing the multilayer pole lug.

8. The current collector assembly of claim 7, wherein the connecting segments have the same cross-sectional area and are electrically connected to the plurality of layers of tabs.

9. The current collector assembly of any of claims 1-6, 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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