DE212024000165U1 - Cover assembly, battery cell and battery pack - Google Patents

Abstract

Cover assembly comprising: a cover plate having a through-hole; a pole having a pole through-hole; wherein the pole is arranged on the cover plate, and wherein the through-hole is connected to the pole through-hole to form a rivet hole; a rivet pin passing through the rivet hole to rivet the cover plate and the pole together, the rivet pin comprising a rivet end passing through the pole through-hole; characterized in that, along the insertion direction of the rivet end, the pole through-hole successively comprises a neck and a receiving segment, the inner diameter of which is larger than that of the neck; wherein the rivet end passing through the neck and arranged in the receiving segment serves to form, under the action of an external force, a deformation section, the inner diameter of which is larger than that of the neck, and wherein the deformation section can be press-fitted directly or indirectly with the receiving segment.

Description

TECHNICAL AREA

The present application relates to the technical field of new energy, in particular a cover assembly, a battery cell and a battery pack.

STATE OF THE ART

The overall airtightness of the battery cells consists primarily of the seals at the positive and negative terminals, as well as the seals at the explosion protection valves. The terminal seal is achieved mainly through the assembly and precise fit of several components. The rivets are fitted to the terminals, and compression deforms the inner sealing ring to create the seal. Therefore, the fit between the terminals and rivets is of paramount importance. This fit should remain stable and free of gaps, even under external forces and environmental influences. However, with current technologies, the strength of the riveted terminals and rivets is not very high, so external impacts and ambient temperature fluctuations can lead to loosening, easily creating gaps.

CONTENT OF THE PRESENT APPLICATION

Based on this, it is necessary to provide a cover assembly that can increase the strength of the riveted poles and rivet pins in relation to the problems described above.

• eine Abdeckplatte, die ein Durchgangsloch aufweist;
• einen Pol, an dem ein Poldurchgangsloch vorgesehen ist;
• wobei der Pol auf der Abdeckplatte angeordnet ist, und wobei das Durchgangsloch mit dem Poldurchgangsloch verbunden ist, um ein Nietloch zu bilden;
• einen Nietstift, der durch das Nietloch geführt ist, um die Abdeckplatte und den Pol miteinander zu vernieten, wobei der Nietstift ein Nietende umfasst, das durch das Poldurchgangsloch hindurchgeführt ist;
• wobei entlang der Einführrichtung des Nietendes das Poldurchgangsloch nacheinander einen Hals und ein Aufnahmesegment umfasst, dessen Innendurchmesser größer als der des Halses ist;
• wobei das durch den Hals hindurchgeführte und im Aufnahmesegment angeordnete Nietende dazu dient, unter Wirkung einer äußeren Kraft einen Verformungsabschnitt zu bilden, dessen Innendurchmesser größer als der des Halses ist, und wobei der Verformungsabschnitt direkt oder indirekt mit dem Aufnahmesegment in Presspassung gebracht werden kann.

A lid assembly comprising:

• a cover plate that has a through hole;
• a pole at which a pole passage hole is provided;
• wherein the pole is arranged on the cover plate, and wherein the through hole is connected to the pole through hole to form a rivet hole;
• a rivet pin which is passed through the rivet hole to rivet the cover plate and the pole together, the rivet pin comprising a rivet end which is passed through the pole passage hole;
• wherein, along the insertion direction of the rivet end, the pole passage hole successively comprises a neck and a receiving segment, the inner diameter of which is larger than that of the neck;
• wherein the rivet end, which passes through the neck and is arranged in the receiving segment, serves to form a deformation section under the influence of an external force, the inner diameter of which is larger than that of the neck, and wherein the deformation section can be brought into a press fit with the receiving segment directly or indirectly.

In one embodiment, the pole passage hole is a funnel-shaped bore.

In one embodiment, the inner wall surface of the pole passage hole is inclined outwards by 5° to 20° in the direction from the cover plate to the pole.

In one embodiment, before it is deformed, the rivet end projects beyond a side of the pole facing away from the cover plate, with the deformation section being flush with a side of the pole facing away from the cover plate.

In one embodiment, the rivet end protrudes 3 mm to 8 mm beyond one side of the pole facing away from the cover plate before it is deformed.

In one embodiment, the rivet end has a straight cylindrical structure before it is deformed.

• ein Gehäuse mit einer Öffnung;
• eine Zellkernbaugruppe, die in dem Gehäuse angeordnet ist; sowie
• die oben genannte Deckelbaugruppe, wobei die Deckelbaugruppe an der Öffnung des Gehäuses angeordnet und mit dem Gehäuse verbunden ist.

The present application also relates to a battery cell comprising the following:

• a case with an opening;
• a nuclear assembly arranged within the casing; as well as
• the aforementioned cover assembly, wherein the cover assembly is arranged at the opening of the housing and connected to the housing.

In one embodiment, one side of the pole facing away from the cover plate is attached to the deformation section by laser welding.

In one embodiment, the cover assembly further comprises a first insulating element, wherein the pole is insulated by a first insulating element arranged between the cover plate and the pole on a side of the cover plate facing away from the cell nucleus assembly.

In one embodiment, the cover assembly further comprises a sealing element and a second insulating element, wherein the sealing element comprises a vertical sealing part and a horizontal sealing part, and wherein the vertical sealing part is located in the through-hole. and wherein the rivet pin is passed through the vertical sealing part, and wherein the horizontal sealing part is connected to the vertical sealing part and is located between the rivet pin and the cover plate, and wherein the second insulating element is located between the horizontal sealing part and the rivet pin.

• die oben genannte Batteriezellen, wobei die Batteriezellen in einer Anzahl von mehr als 1 bereitgestellt sind, und wobei die mehrere Batteriezellen nacheinander gegenüberliegend angeordnet sind; sowie
• mehrere Sammelschienen, wobei jede Sammelschiene die Pole zweier benachbarter Batteriezellen elektrisch miteinander verbindet.

The present application also relates to a battery pack comprising the following:

• the aforementioned battery cells, wherein the battery cells are provided in a number greater than 1, and wherein the multiple battery cells are arranged one after the other opposite each other; and
• multiple busbars, each busbar electrically connecting the poles of two adjacent battery cells.

In one embodiment, a side of the pole facing away from the cover plate has a rivet area and a connection area, wherein the pole through-hole is located in the rivet area, and wherein each busbar electrically connects the connection areas of the poles of two adjacent battery cells.

In one embodiment, the busbar has a connecting part that is electrically connected to the connection area;
wherein the connection area has a positioning groove in which the connecting part is positioned.

In one embodiment, the connecting parts are attached to the inner wall of the positioning groove by laser welding.

In one embodiment, the busbar has a connecting part that is electrically connected to the connection area;
wherein the connecting part has a positioning hole, and wherein the connecting area has a positioning column, and wherein the positioning column is inserted into the positioning hole.

In one embodiment, the positioning column is attached to the inner wall of the positioning hole by laser welding.

In one embodiment, the busbar has a connecting part that is electrically connected to the connection area; wherein the connection area has a positioning groove in which the connecting part is positioned, and wherein the connecting part has a positioning hole, and wherein the connection area has a positioning column, and wherein the positioning column is inserted into the positioning hole.

In one embodiment, the connecting parts are attached to the inner wall of the positioning groove by laser welding, wherein the positioning column is attached to the inner wall of the positioning hole by laser welding.

In one embodiment, the rivet areas and the connection areas are each provided in a number greater than 1, and the multiple rivet areas and the multiple connection areas are arranged offset in the longitudinal direction of the cover plate;
and wherein the number of pole penetration holes corresponds to the number of rivet areas and they are arranged one to one, and wherein the number of rivet pins corresponds to the number of pole penetration holes and they are arranged one to one.

In one embodiment, the busbar comprises a main body part and a connecting part, wherein several connecting parts are arranged at intervals on the two opposite sides of the main body part, and wherein the number of connecting parts on each side of the main body part corresponds to the number of connection areas of the pole and they are connected one to one.

In the aforementioned cover assembly, the rivet end, passing through the neck and positioned in the receiving segment, can, under the influence of an external force, form a deformation section larger than the neck's inner diameter. This deformation section can then directly or indirectly engage with the receiving segment in an interference fit, thus completing the riveting process. Because the pole hole, along the rivet end's insertion direction, successively encompasses a neck and a receiving segment with an inner diameter larger than the neck's, the neck can physically confine the deformation section. Since the neck can physically confine the deformation section, the rivet head always remains firmly connected to the pole when subjected to an external force (opposite the rivet end's insertion direction). Therefore, in the aforementioned cover assembly, the cover plate, the pole and the rivet pin, which are riveted together, exhibit high strength, ensuring that the cover plate, the pole and the rivet pin, which are riveted together, do not loosen under external impacts and under the influence of ambient temperature, but remain firmly connected and no gaps are formed.

BRIEF DESCRIPTION OF THE DRAWING

• 1 zeigt ein schematisches Diagramm der Struktur einer Batterie in einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 2 zeigt eine vergrößerte Ansicht des Teils A gemäß 1;
• 3 zeigt ein schematisches Diagramm der Struktur einer Deckelbaugruppe gemäß 1;
• 4 zeigt eine Draufsicht eines Gebläses gemäß 3;
• 5 zeigt eine Schnittansicht entlang B-B gemäß 4; und
• 6 zeigt eine vergrößerte Ansicht des Teils C gemäß 5.

To clarify the technical solution in the embodiments of the present application or in the prior art, the drawings to be used in the explanation of the embodiments or for the prior art are briefly presented below. Obviously, the drawings described below show only some embodiments of the present application. The person skilled in the art in this field can, provided no creative work is undertaken, derive other drawings from these drawings.

• 1 shows a schematic diagram of the structure of a battery in an embodiment of the present application;
• 2 shows an enlarged view of part A according to 1 ;
• 3 shows a schematic diagram of the structure of a cover assembly according to 1 ;
• 4 shows a top view of a blower according to 3 ;
• 5 shows a sectional view along BB according to 4 ; and
• 6 shows an enlarged view of part C according to 5 .

DETAILED DESCRIPTION

The detailed embodiment of the present application is explained below in conjunction with the drawings to clarify and facilitate understanding of its purpose, features, and advantages. The following explanation presents a number of specific details to enable a comprehensive understanding of the present application. However, the present application can also be implemented in many ways other than those described here, and those skilled in the art can make similar improvements without departing from the general intent of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

It should be noted that in the explanatory notes to this application, the directional or positional relationships described using terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are based on the directional or positional relationships illustrated in the figures. They serve only to clarify this application and to facilitate its explanation. They do not indicate or suggest that the depicted devices or elements have specific directions or are intended to be constructed and operated in specific directions. Consequently, they cannot be construed as a limitation of this application.

Furthermore, “the first” and “the second” are used only to explain the objective and cannot be understood as indicating or implying relative importance or as implicitly referring to the number of required technical features. Therefore, the features defined by “the first” and “the second” may explicitly or implicitly include at least one of the features. In the explanatory notes to this application, “several” refers to at least two, such as 2, 3, etc., unless otherwise specified.

Unless otherwise explicitly stated and defined in the present application, the terms "installation", "coupling", "connection", and "fastening" should be understood in a broader sense. For example, "fastening" can refer to a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection or a connection via a medium; it can also be a connection within two elements or an interaction between two elements, unless otherwise specified. A person skilled in the art in this field will be able to understand the specific meanings of the aforementioned technical terms in the present application based on the specific situations.

In the present application, the wording that the first feature is “above” or “below” the second feature may refer to the first and second features being in direct contact or to the first and second features being in indirect contact through an intermediary, unless other clear statements and definitions exist. Furthermore, the wording that the first feature is “above,” “above,” or “on the top of the second feature” may refer to the first feature being directly above or obliquely above the second feature, or to the horizontal height of the first feature being greater than that of the second feature. Furthermore, the wording that the first feature is “below the second feature” may refer to the first feature being “below,” The phrases "below the second feature" or "at the bottom of the second feature" refer to the fact that the first feature is located directly below or diagonally below the second feature, or that the horizontal height of the first feature is less than that of the second feature.

It should be noted that when an element is described as being "attached" or "arranged" to another element, the element may be located directly on top of the other element, or there may be another element interposed between them. Similarly, when an element is described as being "connected" to another element, the element may be directly connected to the other element, or there may be an interposed element. The technical terms used in the description, such as "vertical," "horizontal," "above," "below," "left," "right," and similar expressions, are used only to clarify the objective and do not represent a single embodiment.

As in 1 and 2 As shown, the battery pack 10 in the preferred embodiment of the present application comprises a battery cell 12. In the present embodiment, the battery cell 12 comprises a housing 12a, a cell core assembly, and a cover assembly 12b. The cell core assembly can be accommodated in the housing 12a. The housing 12a has an opening. The cover assembly 12b is arranged at the opening of the housing 12a.

In the present embodiment, the cover assembly 12b comprises a cover plate 200, a pole 300 and a rivet pin 400. The cover plate 200, the pole 300 and the rivet pin 400 are riveted together and then attached to the opening of the housing 12a, thereby connecting the cover plate 200 to the housing 12a to form a complete shell for the battery cell 12.

In the present embodiment, the cover plate 200 has, as in 2 to 6 The diagram shows a through-hole 210. The pole 300 has a pole through-hole 310. The pole 300 is arranged on the cover plate 200, and the through-hole 210 is connected to the pole through-hole 310 to form a rivet hole. In particular, in the present embodiment, the pole 300 is arranged insulated on a side of the cover plate 200 facing away from the cell core assembly. More precisely, in the present embodiment, the pole 300 is arranged insulated on a side of the cover plate 200 facing away from the cell core assembly by a first insulating element 500, which is arranged between the cover plate 200 and the pole 300.

The rivet pin 400 is guided through the rivet hole to rivet the cover plate 200 and the pole 300 together. The rivet pin 400 comprises a rivet end 400a, which is guided through the pole through-hole 310. Along the insertion direction of the rivet end 400a, the pole through-hole 310 successively comprises a neck 310a and a receiving segment 310b, the inner diameter of which is larger than that of the neck 310a. The rivet end 400a, guided through the neck 310a and positioned in the receiving segment 310b, serves to form a deformation section under the influence of an external force, the inner diameter of which is larger than that of the neck 310a. The deformation section can be press-fitted directly or indirectly with the receiving segment 310b.

In the aforementioned cover assembly 12b, the rivet end 400a, which passes through the neck 310a and is located in the receiving segment 310b, can, under the influence of an external force, form a deformation section that is larger than the inner diameter of the neck 310a. This deformation section can interact directly or indirectly with the receiving segment 310b in an interference fit, thereby completing the riveting process. Since, along the insertion direction of the rivet end 400a, the pole hole 310 successively encompasses a neck 310a and a receiving segment 310b, the inner diameter of which is larger than that of the neck 310a, the neck 310a can physically limit the deformation section. Since the neck 310a can physically limit the deformation section, the rivet pin 400 always remains firmly connected to the pole 300 when subjected to an external force (opposite to the insertion direction of the rivet end 400a). Therefore, in the aforementioned cover assembly 12, the cover plate 200, the pole 300, and the rivet pin 400, which are riveted together, exhibit high strength, ensuring that the cover plate 200, the pole 300, and the rivet pin 400, which are riveted together, do not loosen under external impacts and the influence of ambient temperature, but remain firmly connected without gaps forming.

In the present embodiment, the battery cell 12 is rectangular, and the cover plate 200 is also rectangular. It is understood that in other embodiments, if the battery cell is cylindrical, the cover plate 200 can be round.

In the present embodiment, the rivet pin 400 fits together with the cover plate 200 by means of a sealing element 600 and a second insulating element 700. The rivet pin 400 fits conductively with the pole 300 by riveting it. together with pole 300. In particular, the sealing element 600 in the present embodiment comprises a vertical sealing part and a horizontal sealing part. The vertical sealing part is located in the through-hole 210, and the rivet pin 400 passes through the vertical sealing part, i.e., the rivet pin 400 passes through the through-hole 210 at intervals. The horizontal sealing part is connected to the vertical sealing part and is located between the rivet pin 400 and the cover plate 200. The second insulating element 700 is located between the horizontal sealing part and the rivet pin 400.

In the present embodiment, the deformation section can be directly press-fitted with the receiving segment 310b. This simplifies the components of the aforementioned cover assembly 12b, greatly facilitating its manufacture. It is understood that in other embodiments, the deformation section can be indirectly press-fitted with the receiving segment 310b. In this case, an auxiliary element can be arranged between the receiving segment 310b and the rivet end 400a before deformation. After deformation of the rivet end 400a, the deformation section is press-fitted with the receiving segment 310b via the auxiliary element between the deformation section and the receiving segment 310b; that is, the deformation section is indirectly press-fitted with the receiving segment 310b.

In the present embodiment, the pole passage hole 310 is a funnel-shaped bore. That is, in this embodiment, the inner wall surface of the pole passage hole 310 is inclined outwards in the direction from the cover plate 200 towards the pole 300. In this way, not only can the strength of the cover plate 200, the pole 300, and the rivet pin 400, which are riveted together, be slightly improved, but it is also made easier to form the pole passage hole 310 with the neck 310a and the receiving segment 310b. It is understood that in other embodiments, the pole passage hole 310 can also be a stepped bore.

In the present embodiment, the rivet end 400a projects beyond a side of the pole 300 facing away from the cover plate 200 before it is deformed. The deformation section is flush with a side of the pole 300 facing away from the cover plate 200. In this way, it is very easy to align the deformation section flush with a side of the pole 300 facing away from the cover plate 200. It is understood that in other embodiments, the rivet end 400a can also be received in the receiving segment 310b before it is deformed, and it is also possible to align the deformation section not flush with a side of the pole 300 facing away from the cover plate 200.

In the present embodiment, the rivet end 400a has a straight cylindrical structure before it is deformed. This allows the rivet pin 400 to be manufactured very easily. It is understood that in other embodiments, the rivet end 400a of the rivet pin 400 may also have a conical structure.

In the present embodiment, the inner wall surface of the pole through-hole 310 is inclined outwards by 5° to 20° in the direction from the cover plate 200 to the pole 300. If the angle of inclination is too large, more material is required to press-fit the rivet end 400a and the pole through-hole 310, while an angle of inclination that is too small impairs the connection strength between the rivet pin 400 and the pole 300 after riveting. Taking the above factors into account, the inner wall surface of the pole through-hole 310 is inclined outwards by 5° to 20°. In particular, in the present embodiment, the inner wall surface of the pole through-hole 310 is inclined outwards by 10° in the direction from the cover plate 200 to the pole 300.

In the present embodiment, the rivet end 400a projects 3 mm to 8 mm beyond one side of the pole 300 facing away from the cover plate 200 before it is deformed. It is understood that if the projecting height is too great, it is difficult to rivet the entire protruding portion into the pole through-hole 310, while if the projecting height is too small, it can impair the interference fit between the rivet end 400a and the pole through-hole 310 and/or the connection strength between the rivet pin 400 and the pole 300. Taking the above factors into account, the rivet end 400a is adjusted so that it projects 3 mm to 8 mm beyond one side of the pole 300 facing away from the cover plate 200. In particular, in the present embodiment, the rivet end 400a protrudes by 5 mm beyond one side of the pole 300 facing away from the cover plate 200.

In the present embodiment, one side of the pole 300 facing away from the cover plate 200 is attached to the deformation section of the rivet end 400a by laser welding. In particular, in the present embodiment, the deformation section of the rivet end 400a is press-fitted to the pole through-hole 310 at point a, and one side of the cover plate 200 The far side of the pole 300 is attached at point a to the deformation section of the rivet end 400a by laser welding. In the present embodiment, a double fastening by riveting and laser welding is used. In this way, the bond strength between the rivet pin 400 and the pole 300 can be further increased, ensuring that the riveted pole 300 and the rivet pin 400 do not loosen under external impacts and the influence of ambient temperature, but remain firmly connected without gaps forming. Compared to fastening by riveting or laser welding alone, the double fastening by riveting and laser welding reduces the requirements for the rivet fastening or the laser welding, thus simplifying the implementation of both. It is understood that in other embodiments, laser welding can be omitted.

In the present embodiment, the battery pack comprises 10, as shown in 1 and 2 The illustration shows several battery cells 12 arranged one after the other opposite each other. In the embodiment according to 1 The battery cells 12 are provided in a quantity of 2. It is understood that in other embodiments the number of battery cells 12 can be determined according to the actual requirements. For example, several rows of battery cells 12 can be provided, each row of battery cells 12 comprising several battery cells 12 arranged opposite each other.

In this embodiment, the battery pack 10 further comprises several busbars 14. Each busbar 14 electrically connects the poles 300 of two adjacent battery cells. In this way, several battery cells 12 can be connected very easily in series and/or parallel.

In the present embodiment, one side of the pole 300 facing away from the cover plate 200 has, as shown in 2 and 3 The figure shows a rivet area 300a and a connection area 300b. The pole through-hole 310 is located in the rivet area 300a. Each busbar 14 electrically connects the connection areas 300b of the poles 300 of two adjacent battery cells. In this way, the rivets 400 and the busbars 14 can be independent of each other, thus avoiding mutual interference between the rivets 400 and the busbars 14. It is understood that in other embodiments, each busbar 14 electrically connects the rivet areas 300a of the poles 300 of two adjacent battery cells.

In the present embodiment, the rivet areas 300b and the connection areas 300b are each provided in more than one quantity. The multiple rivet areas 300a and the multiple connection areas 300b are arranged offset along the length of the cover plate 200. The number of terminal holes 310 corresponds to the number of rivet areas 300a and they are arranged one to one. The number of rivet pins 400 corresponds to the number of terminal holes 310 and they are arranged one to one. In this way, the battery cell 12 can meet different application requirements. It is understood that in other embodiments, the multiple rivet areas 300a and the multiple connection areas 300b can also be provided in a random arrangement. It is understood that in other embodiments, the rivet areas 300b and the connection areas 300b are also each provided in a quantity of one.

In the related technology, no positioning structure is provided between the battery cell 12 and the busbar 14, so that a special positioning clamp is required when assembling the battery cell 12 and the busbar 14, which complicates the assembly process of the battery cell 12 and the busbar 14.

To solve the aforementioned problem, the connection area 300b in the present embodiment has a positioning groove 302. The busbar 14 has a connecting part 142 that is electrically connected to the connection area 300b. The connecting part 142 fits into the positioning groove 302 and is positioned within it. The arrangement of the matching connecting part 142 and the positioning groove 302 significantly simplifies the positioning and assembly of the battery cell 12 and the busbar 14, thus eliminating the need for a special positioning clamp.

In the present embodiment, the connection area 300b has a positioning column 304. The connecting part 142 has a positioning hole 142a. The positioning column 304 is inserted into the positioning hole 142a. The arrangement of the positioning column 304 and the positioning hole 142a, which form a plug connection, greatly simplifies the positioning and assembly of the battery cell 12 and the busbar 14, thus eliminating the need for a special positioning clamp.

In the present embodiment, a connecting part 142 and a positioning groove 302, which fit together, as well as a positioning column 304 and a positioning hole 142a, which form a plug connection, are arranged simultaneously, thereby achieving double positioning, which has a better positioning effect. It is understood that in other embodiments it is also possible to arrange only a connecting part 142 and a positioning groove 302, which fit together, or a positioning column 304 and a positioning hole 142a, which form a plug connection.

In the present embodiment, the busbar 14 further comprises a main body part 144. Several connecting parts 142 are arranged at intervals on the two opposite sides of the main body part 144. The number of connecting parts 142 on each side of the main body part 144 corresponds to the number of connection areas 300b of the pole 300, and they are connected one-to-one. In particular, in the present embodiment, there are three rivet areas 300b, two connection areas 300b, and four connecting parts 142. Two connecting parts 142 are arranged at intervals on the two opposite sides of the main body part 144. In this way, the structural design of the battery cell 12 and the busbar 14 can be simplified. It is understood that in other embodiments the number of connection areas 300b and connection parts 142 is not limited to two, but can be determined according to the actual requirements. It is also understood that in other embodiments the number of connection areas 300b and the number of connection parts 142 may differ.

In the present embodiment, the connecting parts 142 are attached to the inner wall of the positioning groove 302 by laser welding. Specifically, in this embodiment, the connecting parts 142 are attached to the inner wall of the positioning groove 302 at point c by laser welding. This ensures a strong connection between the busbar 14 and the terminal 300 of the battery cell. It is understood that in other embodiments, the attachment of the connecting parts 142 to the inner wall of the positioning groove 302 is not limited to laser welding, but can also be achieved using a conductive adhesive.

In the present embodiment, the positioning column 304 is attached to the inner wall of the positioning hole 142a by laser welding. Specifically, in this embodiment, the positioning column 304 is attached to the inner wall of the positioning hole 142a at point d by laser welding. This ensures a strong connection between the busbar 14 and the terminal 300 of the battery cell. It is understood that in other embodiments, the attachment of the positioning column 304 to the inner wall of the positioning hole 142a is not limited to laser welding, but can also be achieved using a conductive adhesive.

In the present embodiment, the connecting part 142 and the inner wall of the positioning groove 302, as well as the positioning column 304 and the inner wall of the positioning hole 142a, are simultaneously fastened by laser welding, thus achieving a double laser welding fastening that provides a better welding effect. It is understood that in other embodiments it is also possible for only the connecting part 142 to be fastened to the inner wall of the positioning groove 302 by laser welding, or for the positioning column 304 to be fastened to the inner wall of the positioning hole 142a by laser welding.

The present application further provides a power-consuming device comprising a battery pack 10 or a battery cell 12 as described above, wherein the power-consuming device is supplied with power by the battery pack 10 or the battery cell 12 as described above; an electrical device comprising the battery pack 10 or the battery cells 12 as described above and capable of being supplied with electrical energy by the battery pack 10 or the battery cells 12 as described above. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a REEV vehicle, etc.; spacecraft include aircraft, rockets, space transporters, and spacecraft, etc.; electric toys include stationary or mobile electric toys, e.g., game consoles, electric vehicle toys, electric steamship toys, and electric aircraft toys, etc. The electric tools include power tools for cutting metal, power tools for grinding, power tools for assembly, and power tools for railways, e.g., electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drivers. Drilling machines, concrete vibrators, electric planers, etc.; the energy storage devices can be energy storage walls, base station storage, container storage, etc.; the amusement devices can be carousels, drop towers, etc. The present application does not provide for any special restrictions on the aforementioned power-consuming device.

In purely electric vehicles, the aforementioned battery pack 10 can serve as a source of drive power and thus replace fossil fuels as drive energy.

The battery pack 10 can, in particular, include a battery management system (BMS) and a plurality of the aforementioned battery cells 12. Several of the battery cells 12 can be electrically connected to each other by a series, parallel, or a combination of series and parallel connections and communicate with the battery management system to form a battery pack. The aforementioned battery management system controls and monitors the operating state of the individual battery cells 12. Furthermore, several battery cells can first be connected in series and/or parallel and, together with the module management system, form a battery module. Then, several battery modules are electrically connected to each other by a series, parallel, or a combination of series and parallel connections, and together with the battery management system, they form a battery pack.

In this arrangement, several battery cells 12 can be installed in the aforementioned battery pack 10 on a support structure such as a housing, frame, or bracket, and the individual battery cells 12, as well as the battery pack 10 and the battery management system, can be electrically connected via common components. The aforementioned battery cells can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and their outer contour can be cylindrical, flat, rectangular, or any other shape, without being limited to these.

The respective technical features of the above embodiments can be combined in any way. To simplify the explanation, not all possible combinations of the respective technical features in the above embodiments are described; however, combinations of technical features without conflicts should be considered to be covered by the scope of the description.

The above examples represent only some embodiments of the present application. The explanations are relatively specific and detailed; however, this should not be understood as a limitation on the scope of the patent in the present application. It should be noted that the person skilled in the art in this field can implement several improvements and modifications without deviating from the concept of the present application. These improvements and modifications should also be considered to be covered by the scope of protection of the present application. Therefore, the scope of protection of the present application should be defined by the claims.

Claims (20)

Cover assembly comprising: a cover plate having a through-hole; a pole having a pole through-hole; wherein the pole is arranged on the cover plate, and wherein the through-hole is connected to the pole through-hole to form a rivet hole; a rivet pin passing through the rivet hole to rivet the cover plate and the pole together, the rivet pin comprising a rivet end passing through the pole through-hole; characterized in that , along the insertion direction of the rivet end, the pole through-hole successively comprises a neck and a receiving segment, the inner diameter of which is larger than that of the neck; wherein the rivet end passing through the neck and arranged in the receiving segment serves to form a deformation section under the influence of an external force, the inner diameter of which is larger than that of the neck, and wherein the deformation section can be press-fitted directly or indirectly with the receiving segment. Cover assembly according to Claim 1 , characterized in that the pole passage hole is a funnel bore. Cover assembly according to Claim 2 , characterized in that the inner wall surface of the pole passage hole is inclined outwards by 5° to 20° in the direction from the cover plate to the pole. Cover assembly according to Claim 1 , characterized in that the rivet end, before it is deformed, projects beyond a side of the pole facing away from the cover plate, wherein the deformation section is flush with a side of the pole facing away from the cover plate. Cover assembly according to Claim 4 , characterized in that the rivet end, before it is deformed, is bent 3 mm to 8 mm beyond one of the The cover plate protrudes on the side facing away from the pole. Cover assembly according to Claim 1 characterized in that the rivet end has a straight cylindrical structure before it is deformed. Battery cell, characterized in that it comprises: a housing with an opening; a cell core assembly arranged in the housing; and a cover assembly according to one of the Claims 1 until 6 , wherein the cover assembly is arranged at the opening of the housing and connected to the housing. Battery cell after Claim 7 , characterized in that one side of the pole facing away from the cover plate is attached to the deformation section by laser welding. Battery cell after Claim 7 , characterized in that the cover assembly further comprises a first insulating element, wherein the pole is insulated by a first insulating element arranged between the cover plate and the pole on a side of the cover plate facing away from the cell nucleus assembly. Battery cell after Claim 7 , characterized in that the cover assembly further comprises a sealing element and a second insulating element, wherein the sealing element comprises a vertical sealing part and a horizontal sealing part, and wherein the vertical sealing part is located in the through-hole, and wherein the rivet pin is passed through the vertical sealing part, and wherein the horizontal sealing part is connected to the vertical sealing part and is located between the rivet pin and the cover plate, and wherein the second insulating element is located between the horizontal sealing part and the rivet pin. Battery pack, characterized in that it comprises: battery cells according to one of the Claims 7 until 10 , wherein the battery cells are provided in a number greater than 1, and wherein the multiple battery cells are arranged one after the other opposite each other; and multiple busbars, wherein each busbar electrically connects the poles of two adjacent battery cells. Battery pack after Claim 11 , characterized in that one side of the pole facing away from the cover plate has a rivet area and a connection area, wherein the pole through hole is located in the rivet area, and wherein each busbar electrically connects the connection areas of the poles of two adjacent battery cells. Battery pack after Claim 12 , characterized in that the busbar has a connecting part which is electrically connected to the connection area; wherein the connection area has a positioning groove in which the connecting part is positioned. Battery pack after Claim 13 , characterized in that the connecting parts are attached to the inner wall of the positioning groove by laser welding. Battery pack after Claim 12 , characterized in that the busbar has a connecting part which is electrically connected to the connection area; wherein the connecting part has a positioning hole, and wherein the connection area has a positioning column, and wherein the positioning column is inserted into the positioning hole. Battery pack after Claim 15 , characterized in that the positioning column is attached to the inner wall of the positioning hole by laser welding. Battery pack after Claim 12 , characterized in that the busbar has a connecting part which is electrically connected to the connecting area; wherein the connecting area has a positioning groove in which the connecting part is positioned, and wherein the connecting part has a positioning hole, and wherein the connecting area has a positioning column, and wherein the positioning column is inserted into the positioning hole. Battery pack after Claim 17 , characterized in that the connecting parts are attached to the inner wall of the positioning groove by laser welding, wherein the positioning column is attached to the inner wall of the positioning hole by laser welding. Battery pack after Claim 12 , characterized in that the rivet areas and the connection areas are each provided in a number greater than 1, and wherein the multiple rivet areas and the multiple connection areas are arranged offset in the longitudinal direction of the cover plate; and wherein the number of pole penetration holes corresponds to the number of rivet areas and they are arranged one to one, and wherein the number of rivet pins corresponds to the number of pole passage holes correspond and they are arranged one to one. Battery pack after Claim 19 , characterized in that the busbar comprises a main body part and a connecting part, wherein several connecting parts are arranged at intervals on the two opposite sides of the main body part, and wherein the number of connecting parts on each side of the main body part corresponds to the number of connecting areas of the pole and they are connected one to one.