CN113422165A

CN113422165A - Current collector assembly, battery monomer and battery pack

Info

Publication number: CN113422165A
Application number: CN202110798108.XA
Authority: CN
Inventors: 周龙; 吴聪苗; 郭敏; 蓝金花
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Haichen New Energy Technology Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-09-21

Abstract

The invention discloses a current collector assembly, a battery monomer and a battery pack, wherein the current collector assembly comprises: the current collector comprises a plurality of layers of lugs, the conductive connecting assembly comprises a protection plate and a connecting plate, the protection plate is arranged on one side of the plurality of layers of lugs in the thickness direction, and the connecting plate is arranged on the other side of the plurality of layers of lugs in the thickness direction; wherein, one of the connecting plate and the protective plate is provided with a bulge which pierces the multilayer pole lug through high-frequency vibration and is electrically connected with the multilayer pole lug, and the frequency of the high-frequency vibration is in the range of 15KHz-40 KHz. According to the current collector assembly, the bulge pierces through the multilayer lug through high-frequency vibration, the high-frequency vibration acts on the contact surface of a welding object, so that the surfaces of two objects rub with each other to generate heat, fusion between molecular layers is formed, the welding speed between the bulge and the multilayer lug is further improved, the protection plate covering the bulge is arranged, the top of the bulge is prevented from exceeding the protection cover, the bulge is prevented from being damaged, and the service life of the current collector assembly is prolonged.

Description

Current collector assembly, battery monomer and battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a current collector assembly, a battery monomer and a battery pack.

Background

In the related art, copper foils are welded on two sides of a single-layer tab in an ultrasonic roll welding mode, and the welded copper foils are welded on a flexible connection. In the welding mode, each layer of tab needs to be welded, so that the welding cost is increased, and the material cost of the copper foil is increased. After welding, the welded portion is easily damaged.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a current collector assembly, a battery monomer and a battery pack, wherein the current collector assembly is ingenious in design, can improve the welding speed, and protects the protrusions from being damaged.

The invention also provides a battery monomer.

The invention also provides a battery pack.

The current collector assembly according to the first aspect of the present invention includes: the current collector comprises a plurality of layers of tabs which are arranged in a stacking mode in the thickness direction of the tabs; the conductive connecting assembly comprises a protective plate and a connecting plate, the protective plate is arranged on one side of the multilayer lug in the thickness direction, and the connecting plate is arranged on the other side of the multilayer lug in the thickness direction; the connecting plate and the protective plate are provided with bulges, the bulges pierce the multiple layers of the lugs through high-frequency vibration and are electrically connected with the multiple layers of the lugs, and the frequency of the high-frequency vibration ranges from 15KHz to 40 KHz.

According to the current collector assembly, the bulges pierce through the multi-layer lugs through high-frequency vibration, the high-frequency vibration acts on the contact surface of a welding object, the surfaces of two objects are mutually rubbed to generate heat, fusion between molecular layers is formed, the welding speed between the bulges and the multi-layer lugs is further improved, the stable connection between the lugs and the connecting piece is ensured, the protection plate covering the bulges is arranged, the tops of the bulges are prevented from exceeding the protection cover, the bulges are prevented from being damaged, and the service life of the current collector assembly is prolonged.

In some embodiments, the high frequency vibrations have an amplitude in the range of 5um to 100 um.

In some embodiments, the protrusion extends on a surface of the connection plate or the protection plate, and a vibration direction of the high-frequency vibration is parallel to an extending direction of the protrusion.

In some embodiments, the high frequency vibrations are vibrations generated by ultrasonic welding.

In some embodiments, the connecting plate is provided with the protrusion, one end of the protrusion is connected with the connecting plate, the protrusion provided on the connecting plate pierces and is electrically connected with the plurality of layers of the tabs through high-frequency vibration, and the other end of the protrusion is connected with the protective plate.

Further, the other end of the protrusion is fixed to an inner side surface of the protection plate or embedded in the protection plate by ultrasonic welding.

Furthermore, the protection plate is provided with the protrusions, and the protrusions of the protection plate penetrate through multiple layers of the tabs through high-frequency vibration and then are connected with the connection plate.

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

Further, the plurality of protrusions are arranged more densely in the vibration direction of the high-frequency vibration than in other directions other than the vibration direction of the high-frequency vibration.

Still further, a plurality of the protrusions extend in a vibration direction of the high-frequency vibration and are arranged at intervals in a direction perpendicular to the vibration direction of the high-frequency vibration.

Still further, the current collector comprises a plurality of pole pieces arranged in a stacked manner, wherein the pole pieces comprise the pole lugs; the pole piece includes: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

A battery cell according to a second aspect of the invention includes the current collector assembly of the above first aspect of the invention.

According to the single battery, the current collector assembly provided with the first aspect is applied to the single battery, so that the assembly difficulty of the single battery is reduced, the manufacturing time of the single battery is reduced, the labor cost is reduced, and the reliability of the single battery is ensured.

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

According to the battery pack, the battery monomer in the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic view of a current collector assembly according to an embodiment of the first aspect of the present invention;

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

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

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

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

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

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

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

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

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

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

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

FIG. 13 is a schematic illustration of a side view of the connector shown in FIG. 12;

FIG. 14 is a schematic view of the connector shown in FIG. 1, wherein the protrusions are formed as pyramids;

FIG. 15 is a schematic illustration of a side view of the connector shown in FIG. 14;

FIG. 16 is a schematic view of a coupling of the embodiment shown in FIG. 1;

FIG. 17 is a schematic illustration of a side view of the connector shown in FIG. 16;

fig. 18 is a schematic of a side view of the current collector assembly shown in fig. 16;

fig. 19 is a schematic view of a battery cell according to an embodiment of the second aspect of the invention;

fig. 20 is a schematic view of the current collector assembly shown in fig. 19;

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

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

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

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

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

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

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

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

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

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

fig. 31 is a schematic view of a current collector.

Reference numerals:

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

the protrusions 1012, the connecting section 10121, the piercing section 10122,

a current collector assembly 200, a protective plate 201, a current collector 202, a pole piece 2021, a pole tab 20211,

a first conductive layer 202111, a second conductive layer 202112, a support insulator layer 202113,

the battery cell 1000.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

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

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

Specifically, the current collector assembly 200 includes: the current collector 202 comprises a multilayer tab 20211, the multilayer tab 20211 is arranged in a stacked mode in the thickness direction of the tab 20211, the conductive connection assembly 100 comprises a protection plate 201 and a connection plate 1011, the protection plate 201 is arranged on one side of the multilayer tab 20211 in the thickness direction, the connection plate 1011 is arranged on the other side of the multilayer tab 20211 in the thickness direction, a protrusion 1012 is arranged on one of the connection plate 1011 and the protection plate 201, the protrusion 1012 penetrates through the multilayer tab 20211 through high-frequency vibration and is electrically connected with the multilayer tab 20211, and the frequency of the high-frequency vibration is 15KHz-40 KHz.

That is, the multilayer tab 20211 is stacked in the thickness direction of the tab 20211, the protective plate 201 is provided on one side of the multilayer tab 20211 in the thickness direction, the connection plate 1011 is provided on the other side of the multilayer tab 20211 in the thickness direction, one end of the protrusion 1012 is connected to the connection plate 1011, the protrusion 1012 penetrates the multilayer tab 20211 and is electrically connected to the multilayer tab 20211, the other end of the protrusion 1012 is located inside the outer side surface of the protective plate 201, the protrusion 1012 may be formed on the connection plate 1011, the protrusion 1012 may also be formed on the protective plate 201, and the protrusion 1012 pierces the multilayer tab 20211 by high-frequency vibration having a vibration frequency range of 15KHz to 40 KHz.

For example, the vibration frequency of the dither may be: 15KHz, 20KHz, 25KHz, 30KHz, 35KHz, 40KHz, and so forth.

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 current collector assembly 200 provided by the embodiment of the invention, the protrusions 1012 penetrate through the multi-layer tabs 20211 through high-frequency vibration, the high-frequency vibration acts on the contact surface of a welding object, so that the surfaces of two objects rub against each other to generate heat, fusion between molecular layers is formed, the welding speed between the protrusions 1012 and the multi-layer tabs 20211 is further increased, the stable connection between the tabs 20211 and the connecting piece 101 is ensured, the protection plate 201 covering the protrusions 1012 is arranged, the top of the protrusions 1012 is prevented from exceeding the protection cover, the protrusions 1012 are prevented from being damaged, and the service life of the current collector assembly 200 is prolonged.

In some embodiments of the invention, when the amplitude of the high-frequency vibration is within the range of 5um to 100um, the welding effect can be further improved, the welding speed is further improved, and the welding difficulty is further reduced. For example, the amplitude of the dither may be: 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, 65um, 70um, 75um, 80um, 85um, 90um, 95um, 100um, and so on.

In some embodiments of the present invention, the protrusions 1012 extend on the surface of the connection plate 1011 or the protection plate 201, and the vibration direction of the high-frequency vibration is parallel to the extending direction of the protrusions 1012. That is, the protrusions 1012 may extend on the surface of the connection plate 1011, the protrusions 1012 may also extend on the surface of the protection plate 201, the extending direction of the protrusions 1012 is parallel to the direction of the high-frequency vibration, and the extending direction of the protrusions 1012 is the same as the direction of the high-frequency vibration, which is helpful to increase the welding speed of the protrusions 1012 and the tab 20211, reduce the production time, and improve the production efficiency.

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.

Further, protruding 1012 is located on connecting plate 1011, and protruding 1012 passes behind the multilayer utmost point ear 20211 and links to each other with protection plate 201, protruding 1012 can with connecting plate 1011 integrated into one piece, like this, has reduced current collector assembly 200's spare part quantity, has improved current collector assembly 200's holistic joint strength, has promoted protruding 1012 and utmost point ear 20211's connection stability, has reduced current collector assembly 200's defective rate, has prolonged current collector assembly 200's life.

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

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

Specifically, the protrusion 1012 may be connected to the connection plate 1011 by means of electromagnetic pulse welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by friction welding; the plurality of protrusions 1012 may also be connected to the connection plate 1011 by means of ultrasonic welding.

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 and the protection plate 201 may be integrally formed, so that the number of parts of the current collector assembly 200 is reduced, the overall connection strength of the current collector assembly 200 is improved, the connection stability of the protrusion 1012 and the tab 20211 is improved, the defective rate of the current collector assembly 200 is reduced, and the service life of the current collector assembly 200 is prolonged.

In other embodiments of the present invention, the protection plate 201 and the protrusion 1012 are separately disposed, and the protrusion 1012 is welded, bonded, inserted, or clamped on the protection plate 201, so that the protection plate 201 and the protrusion 1012 are two independent components, which reduces the production difficulty of the current collector assembly 200, reduces the production cost of the current collector assembly 200, and improves the fault tolerance of the protrusion 1012 and the tab 20211 during the welding process.

Preferably, the protrusion 1012 is connected 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 invention, preferably the high frequency vibrations are vibrations generated by ultrasonic welding. The ultrasonic welding has the advantages of high welding speed, high welding strength, good sealing performance, 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 solder, no spark in the welding process, environmental protection and safety.

In some embodiments, the welding pressure of the ultrasonic wave is not less than 20N, and the welding time is not less than 30 ms.

In one embodiment of the present invention, the connection plate 1011 is provided with a projection 1012, one end of the projection 1012 is connected to the connection plate 1011, the projection 1012 provided on the connection plate 1011 pierces the multi-layer tab 20211 by high frequency vibration and is electrically connected to the multi-layer tab 20211, and the other end of the projection 1012 is connected to the protection plate 201. Referring to fig. 2, the lower end of the protrusion 1012 is connected to the connection plate 1011, the protrusion 1012 pierces the multi-layered tab 20211 under the high-frequency vibration of ultrasonic welding, and the protrusion 1012 is electrically connected to the multi-layered tab 20211. Thus, the projections 1012 can pierce the multi-layer tab 20211 more easily under the action of the own gravity of the tab 20211 during welding, and the welding speed is further increased.

Further, the other end of the projection 1012 is fixed to the inner side surface of the protection plate 201 or embedded in the protection plate 201 by ultrasonic welding. For example, as shown in fig. 2, the upper ends of the protrusions 1012 are fixedly connected to the protection plate 201 by ultrasonic welding, and the upper ends of the protrusions 1012 are connected to the lower side surface of the protection plate 201. Therefore, the connection strength of the tab 20211 and the protrusion 1012 is further improved, and the tab 20211 is prevented from being separated from the protrusion 1012, so that the structure of the current collector assembly 200 is more stable, the production yield of the current collector assembly 200 is ensured, the yield of the battery monomer 1000 is improved, and the danger of the battery pack is reduced.

Alternatively, the upper end of the protrusion 1012 may be embedded in the protection plate 201 to be connected to the protection plate 201.

In another embodiment of the present invention, the protection plate 201 is provided with protrusions 1012, and the protrusions 1012 provided on the protection plate 201 are connected to the connection plate 1011 after piercing the multi-layered tab 20211 by high frequency vibration. Referring to fig. 2, the upper end of the projection 1012 is connected to the protective plate 201, the projection 1012 pierces the multi-layered tab 20211 under high frequency vibration of ultrasonic welding, and the lower end of the projection 1012 is connected to the connection plate 1011, the projection 1012 being electrically connected to the multi-layered tab 20211. Therefore, the projections 1012 can pierce the multi-layer tab 20211 more easily under the action of the self gravity of the protection plate 201 during welding, and the welding speed is increased.

In some embodiments of the present invention, the protrusions 1012 comprise a plurality, and the plurality of protrusions 1012 are arranged in a matrix. Specifically, protruding 1012 is including a plurality of, a plurality of protruding 1012 are arranged at one of them side surface of connecting plate 1011 for the matrix, a plurality of protruding 1012 that the array was arranged has improved utmost point ear 20211 and connecting piece 101 joint strength, it breaks away from each other with connecting piece 101 to have avoided utmost point ear 20211 in transportation or use, the yields of battery cell 1000 has been promoted, the area of contact between protruding 1012 and every layer of utmost point ear 20211 has been increased, the area of overflowing has been increased, the heat dissipation is balanced, the difficult trouble that takes place of battery package, user's danger coefficient has been reduced, user's use experience has been improved.

In some embodiments of the present invention, the plurality of protrusions 1012 are arranged more densely in the vibration direction of the high-frequency vibration than in other directions other than the vibration direction of the high-frequency vibration. That is, the density of the arrangement of the plurality of projections 1012 in the ultrasonic vibration direction is greater than the density in the other directions, the plurality of projections 1012 are projected in a direction away from the connection plate 1011, the density of the arrangement of the plurality of projections 1012 in the ultrasonic vibration direction is the greatest, and the density of the plurality of projections 1012 in the other directions other than the ultrasonic vibration direction is smaller than the density of the plurality of projections 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 other words, the plurality of protrusions 1012 are arranged less densely in the direction perpendicular to the ultrasonic vibration direction than in the other directions except for 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 plurality of protrusions 1012 extend along a vibration direction of the high-frequency vibration and are arranged at intervals in a direction perpendicular to the vibration direction of the high-frequency vibration. Referring to fig. 3, a plurality of protrusions 1012 extend along the vibration direction of the ultrasonic waves on the upper surface of the connection plate 1011 and are spaced apart in the direction perpendicular to the vibration direction of the ultrasonic waves, and the protrusions 1012 are formed in a long shape, so that the contact area between the tab 20211 and the protrusions 1012 is increased, the tab 20211 and the protrusions 1012 are prevented from being welded insecurely, and the connection strength between the tab 20211 and the connection member 101 is improved.

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

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

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

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

In some embodiments of the invention, the connection plate 1011 is made of the same material as the protrusions 1012. Because the material is different, the temperature resistance of conductor and the parameter such as resistance are also different, have great potential safety hazard, and use the same material, then guaranteed battery monomer 1000's reliability, reduced the fault rate, also guaranteed the safety in utilization of battery package, avoided the emergence of accident.

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

In 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 current collector 202 includes a plurality of pole pieces 2021 arranged in a stack, each pole piece 2021 includes a tab 20211, the tab 20211 includes: a support insulating layer 202113, and a first conductive layer 202111 and a second conductive layer 202112 which cover both side surfaces in the thickness direction of the support insulating layer 202113, respectively. Referring to fig. 31, a support insulating layer 202113 is interposed between a first conductive layer 202111 and a second conductive layer 202112, and the first conductive layer 202111 and the second conductive layer 202112 cover an upper surface and a lower surface of the support insulating layer 202113, respectively.

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

In other embodiments, referring to FIG. 5, the protrusions 1012 comprise two portions: a connecting section 10121 and a puncture section 10122, the lower part of the protrusion 1012 is the connecting section 10121, the upper part of the protrusion 1012 is the puncture section 10122, the connecting section 10121 is connected with the connecting plate 1011, and the puncture section 10122 is connected at the upper end of the 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 one embodiment of the present invention will be described with reference to fig. 1 to 31.

Referring to fig. 16, the protrusion 1012 is formed in a long bar shape, the current collector assembly 200 includes a current collector 202 and a conductive connection assembly 100, the upper surface of the connection plate 1011 is provided with a plurality of protrusions 1012, and the plurality of protrusions 1012 extend in the ultrasonic vibration direction on the upper surface of the connection plate 1011, the thickness of the connection plate 1011 is 0.8mm, the height of the protrusion 1012 is 0.6mm, the length L of the protrusion 1012 is 13mm, the width d 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 connection plate 1011, the connection plate 1011 is integrally formed with the plurality of protrusions 1012, the tab 20211 has three layers, which are from top to bottom: the first conductive layer 202111, the second conductive layer 202112 and the supporting insulation layer 202113, the protection plate 201 is arranged above the multi-layer tab 20211, the upper end of the protrusion 1012 is connected with the protection plate 201, the vibration frequency of ultrasonic waves is in the range of 15KHz-40KHz, the amplitude is in the range of 5um to 100um, the welding pressure of the ultrasonic waves is not less than 20N, and the welding time is not less than 30 ms.

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

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

The battery pack according to the embodiment of the third aspect of the present invention includes the battery cell 1000 according to the embodiment of the second aspect of the present invention described above.

According to the battery pack provided by the embodiment of the invention, the battery monomer 1000 in the embodiment of the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A current collector assembly, comprising:

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

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

the connecting plate and the protective plate are provided with bulges, the bulges pierce the multiple layers of the lugs through high-frequency vibration and are electrically connected with the multiple layers of the lugs, and the frequency of the high-frequency vibration ranges from 15KHz to 40 KHz.

2. The current collector assembly of claim 1, wherein the high frequency vibrations have an amplitude in a range of 5um to 100 um.

3. The current collector assembly of claim 1, wherein the protrusions extend on the surface of the connection plate or the protection plate, and the vibration direction of the high-frequency vibration is parallel to the extension direction of the protrusions.

4. The current collector assembly of claim 1, wherein the high frequency vibrations are vibrations generated by ultrasonic welding.

5. The current collector assembly as claimed in claim 1, wherein said protrusions are disposed on said connection plate, one end of said protrusions is connected to said connection plate, said protrusions disposed on said connection plate pierce and electrically connect with said plurality of layers of said tabs by high frequency vibration, and the other end of said protrusions is connected to said protection plate.

6. The current collector assembly of claim 5, wherein the other end of the protrusion is fixed to an inside surface of the protection plate or embedded in the protection plate by ultrasonic welding.

7. The current collector assembly as claimed in claim 1, wherein said protrusions are disposed on said protection plate, and said protrusions disposed on said protection plate are connected to said connection plate after penetrating through multiple layers of said tabs by high frequency vibration.

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

9. The current collector assembly of claim 8, wherein the plurality of protrusions are arranged with a greater density in the direction of vibration of the high-frequency vibrations than in directions other than the direction of vibration of the high-frequency vibrations.

10. The current collector assembly of claim 8, wherein a plurality of the protrusions extend along a vibration direction of the high-frequency vibration and are spaced apart in a direction perpendicular to the vibration direction of the high-frequency vibration.

11. The current collector assembly of any one of claims 1-10, 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.

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

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