CN217691560U - 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 plate is arranged on one side of the multilayer lug in the thickness direction and is connected with the plate, and the connecting plate is arranged on the other side of the multilayer lug in the thickness direction; the raised end is connected with the connecting plate, the protrusion penetrates through the multilayer pole lugs and is electrically connected with the multilayer pole lugs, and the other end of the protrusion is located on the inner side of the outer side surface of the protective plate. According to the utility model discloses a current collector subassembly covers bellied protection shield through setting up, avoids the arch to exceed the visor to avoided the arch to receive the damage, prolonged current collector subassembly's life, improved the joint strength between utmost point ear and the arch, reduced utmost point ear and the protruding possibility that breaks away from of taking place in transportation or use, guaranteed the free reliability of battery, reduced the fault rate, also guaranteed the safety in utilization of battery package, 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 group spare, 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 multilayer tabs are arranged in a stacking mode in the thickness direction of the tabs; the protection plate is arranged on one side of the multilayer lug in the thickness direction and is connected with the plate, and the connecting plate is arranged on the other side of the multilayer lug in the thickness direction; the protection plate comprises a connection plate, a plurality of layers of lugs and a plurality of bulges, wherein the connection plate is connected with the lug through the connection plate, the lugs penetrate through the layers of the lugs and are electrically connected with the layers of the lugs, and the other ends of the lugs are positioned on the inner side of the outer side surface of the protection plate.

According to the utility model discloses a current collector subassembly covers bellied protection shield through setting up, it surpasss the visor to have avoided bellied top, thereby avoided the arch to receive the damage, the life of current collector subassembly has been prolonged, the joint strength between utmost point ear and the arch has been improved, it is firm to connect, the possibility that utmost point ear and arch take place to break away from in transportation or use has been reduced, the free reliability of battery has been guaranteed, the fault rate has been reduced, the safety in utilization of battery package has also been guaranteed, the emergence of accident has been avoided.

In some embodiments, the other end of the projection is connected to the protection plate.

In some embodiments, the other end of the projection is fixed to an inner side surface of the protection plate.

In some embodiments, the protrusion is disposed on the connecting plate, and the protrusion penetrates through the plurality of layers of tabs and is connected to the protection plate.

In some embodiments, the protrusion is disposed on the protection plate, and the protrusion penetrates through the plurality of layers of tabs and is connected to the connection plate.

Further, the height of the protrusions ranges from 0.1mm to 3mm in the thickness direction of the tab.

Further, the protrusion comprises a plurality of protrusions which are arranged in a matrix form.

Further, the protrusions extend in a straight line and/or a curved line in a plane perpendicular to the thickness direction of the tab.

Furthermore, the plurality of protrusions are connected with the plurality of layers of tabs through ultrasonic welding, and the density of the plurality of protrusions arranged in the ultrasonic vibration direction is greater than that of the plurality of protrusions arranged in other directions.

Still further, the tab 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 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 first aspect of the present invention;

fig. 2 is a schematic of a side view of the current collector assembly shown in fig. 1;

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

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

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

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

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

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

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

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

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

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

Reference numerals:

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

protrusion 1012, connection section 10121, piercing section 10122, current collector assembly 200, 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 the 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 functions 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: multilayer tab 20211, protective plate 201, connecting plate 1011 and projection 1012.

Specifically, the current collector assembly 200 includes a multi-layered tab 20211, a protection plate 201, a connection plate 1011, and a protrusion 1012. The multilayer tab 20211 is arranged in a stacked manner 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 connecting plate 1011 is provided on the other side of the multilayer tab 20211 in the thickness direction, one end of the projection 1012 is connected to the connecting plate 1011, the projection 1012 penetrates the multilayer tab 20211 and is electrically connected to the multilayer tab 20211, and the other end of the projection 1012 is located inside the outer side surface of the protective plate 201.

That is, in the thickness direction of the tab 20211 (for example, in the up-down direction shown in fig. 2), the multilayer tab 20211 is disposed in a stacked manner, the protective plate 201 is disposed on one side of the multilayer tab 20211 (for example, on the upper side of the multilayer tab 20211 shown in fig. 2), the connection plate 1011 is disposed on the other side of the multilayer tab 20211 (for example, on the lower side of the multilayer tab 20211 shown in fig. 2), the connection plate 1011 is connected to one end of the projection 1012 (for example, the lower end of the projection 1012 shown in fig. 2), the projection 1012 pierces through the multilayer tab 20211, and the projection 1012 is electrically connected to the multilayer tab 20211, and the other end of the projection 1012 (for example, the upper end of the projection 1012 shown in fig. 2) is located in a layer of the surface of the protective plate 201 facing the connection plate 1011. Thus, the projections 1012 are prevented from being damaged, and the service life of the multilayer tab 20211 is prolonged.

Referring to fig. 2, in the up-down direction, the multi-layer tab 20211 is stacked up and down, the protection plate 201 is located on the upper side of the multi-layer tab 20211, the connection plate 1011 is located on the lower side of the multi-layer tab 20211, the connection plate 1011 is connected to the lower end of the protrusion 1012, the upper end of the protrusion 1012 is adapted to pierce through the multi-layer tab 20211, the protrusion 1012 is electrically connected to the tab 20211, and the upper end of the protrusion 1012 is located in the lower surface of the protection plate 201. It will be appreciated that the protrusions 1012 are covered by the protective plate 201.

According to the utility model discloses current collector assembly 200, through setting 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, current collector assembly 200's life has been prolonged, the joint strength between utmost point ear 20211 and the protruding 1012 has been improved, it is firm to connect, the possibility that utmost point ear 20211 and protruding 1012 take place to break away from in transportation or use has been reduced, battery monomer 1000's reliability has been guaranteed, the fault rate has been reduced, 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 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, inserting, 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. Like this, further improved utmost point ear 20211 and protruding 1012's joint strength, avoided utmost point ear 20211 and protruding 1012 to take place to break away from for current collector assembly 200's structure is more firm, has guaranteed current collector assembly 200's production yields, has improved battery monomer 1000's yields, has reduced battery package's danger, uses safelyr.

The utility model discloses an in some embodiments, protruding 1012 locates on the connecting plate 1011, and protruding 1012 passes behind multilayer utmost point ear 20211 and links to each other with protection shield 201, protruding 1012 can with connecting plate 1011 integrated into one piece, and like this, the spare part quantity of current collector subassembly 200 has been reduced, the holistic joint strength of current collector subassembly 200 has been improved, protruding 1012 has promoted the stability of being connected with utmost point ear 20211, 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 electromagnetic pulse welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by friction welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by means of ultrasonic welding.

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

In other embodiments of the utility model, protection plate 201 and protruding 1012 adopt the components of a whole that can function independently to set up, and protruding 1012 is through welding, bonding, grafting or joint on protection plate 201, and like this, protection plate 201 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 of protruding 1012 with utmost point ear 20211 welding process.

Preferably, the protrusion 1012 is connected to the protection plate 201 by welding, the connection is simple, and the protrusion 1012 is firmly connected to the protection plate 201 and is not easily damaged.

Specifically, the protrusions 1012 may be connected to the protective plate 201 by means of electromagnetic pulse welding; the plurality of protrusions 1012 may also be connected to the protection plate 201 by means of friction welding; the plurality of protrusions 1012 may also be connected to the protective plate 201 by means of ultrasonic welding.

In some embodiments of the present invention, the height of the protrusion 1012 in the thickness direction of the tab 20211 is in the range of 0.1mm to 3 mm. That is to say, the height of the protrusion 1012 protruding from the connecting plate 1011 is in the range of 0.1mm to 3mm, so that the waste of materials is avoided, the connection strength between the tab 20211 and the connecting member 101 is ensured, the whole structure of the battery cell 1000 is convenient to assemble into a battery pack, the installation space is saved, the structure is compact, the size of the battery pack is reduced, and the transportation cost is reduced.

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

In some embodiments of the present invention, the width of the protrusion 1012 is in the range of 0.1mm to 3mm, thereby avoiding the waste of materials and ensuring the connection stability of the tab 20211 and the connection member 101. For example, the width of protrusion 1012 may be: 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.55mm, 0.6mm, 0.85mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.35mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.45mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, and the like.

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

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

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.

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, in a direction perpendicular to the ultrasonic vibration, the distance L2 between two adjacent protrusions 1012 is not less than the width d of the protrusions 1012. 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 protrusions 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 material is different, the temperature resistance of conductor and the parameter such as resistance are also different, have great potential safety hazard, and use the same material, then guaranteed battery monomer 1000's reliability, reduced the fault rate, also guaranteed the safety in utilization of battery package, avoided the emergence of accident.

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

In 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 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.

In other embodiments, referring to FIG. 5, the protrusions 1012 comprise two portions: connecting section 10121 and stabbing section 10122, the lower part of arch 1012 is connecting section 10121, and the upper portion of arch 1012 is stabbing section 10122, and connecting section 10121 links to each other with the connecting plate 1011, and stabbing section 10122 connects the upper end at connecting section 10121.

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

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

Referring to fig. 16, the protrusion 1012 is formed in a long bar shape, the current collector assembly 200 has a plurality of layers of tabs 20211, a protective plate 201, a connecting plate 1011, and protrusions 1012, the protrusion 1012 includes a plurality of protrusions, each protrusion 1012 protrudes upward from the upper surface of the connecting plate 1011, and the plurality of protrusions 1012 extends in the ultrasonic vibration direction on the upper surface of the connecting plate 1011, the thickness of the connecting plate 1011 is 0.8mm, the length L of the protrusion 1012 is 13mm, the width d of the protrusion 1012 is 0.6mm, the height of the protrusion 1012 is 0.6mm, the distance L2 between two adjacent protrusions 1012 is 2.4mm, the protrusion 1012 extends in a straight line on the upper surface of the connecting plate 1011, the connecting plate 1011 is integrally formed with the plurality of protrusions 1012, the tabs 20211 have three layers, which are, 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 to implicitly indicate 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 skilled in the art.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 present 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 (12)

1. A current collector assembly, comprising:

the multilayer tabs are arranged in a stacking mode in the thickness direction of the tabs;

the protective plate is arranged on one side of the multilayer tab in the thickness direction;

the connecting plate is arranged on the other side of the multilayer tab in the thickness direction;

the connecting plate is provided with a plurality of layers of lugs, the lugs are electrically connected with the lugs, and the other ends of the lugs are positioned on the inner side of the outer side surface of the protective plate.

2. The current collector assembly of claim 1, wherein the other end of the protrusion is connected to the protection plate.

3. The current collector assembly of claim 1, wherein the other end of the protrusion is fixed to an inside surface of the protection plate.

4. The current collector assembly of claim 1, wherein the protrusions are disposed on the connection plate, and the protrusions are connected to the protection plate after penetrating through the plurality of layers of the tabs.

5. The current collector assembly as claimed in claim 1, wherein the protrusions are disposed on the protection plate, and the protrusions are connected to the connection plate after penetrating through the plurality of layers of tabs.

6. The current collector assembly of claim 1, wherein the height of the protrusions in the thickness direction of the tab is in the range of 0.1mm to 3 mm.

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

8. The current collector assembly of claim 1, wherein the protrusions extend along a straight line and/or a curved line in a plane perpendicular to the thickness direction of the tab.

9. The current collector assembly of claim 1, wherein a plurality of the protrusions are connected to the plurality of layers of the tabs by ultrasonic welding, and the protrusions are arranged more densely in the ultrasonic vibration direction than in other directions.

10. The current collector assembly of any one of claims 1-9, wherein the tab comprises: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

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

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

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