CN219371278U - Battery device - Google Patents

Abstract

The present disclosure relates to the field of battery technology, and in particular, to a battery device, where the battery device includes a battery and a busbar, and the battery includes a post; the busbar comprises a pole connecting part, the pole is welded to the pole connecting part, the pole connecting part comprises a first main body layer and a first welding auxiliary layer, and the first welding auxiliary layer is positioned on one side, close to the battery, of the first main body layer; the pole is provided with an aluminum layer at one end close to the pole connecting part, the first main body layer is a copper layer, and the first welding auxiliary layer is a nickel layer. Through the welding auxiliary layer that the nickel was made, can improve the welding effect of utmost point post and copper first main part layer to promote the connection stability of utmost point post and busbar.

Description

Battery device

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery device.

Background

Battery devices are often provided in electric vehicles for powering the electric vehicles. The battery device includes a plurality of batteries and a bus bar for making electrical connection of the plurality of batteries. The battery comprises a shell, a battery core and a pole, wherein the pole is arranged on the shell and connected with the battery core. In order to achieve connection of a plurality of batteries, the bus bars are welded to the poles of the batteries. In the related art, when the bus bar and the pole are welded, the welding effect of the bus bar and the pole is poor, and then the connection stability of the bus bar and the pole is poor, the interface resistance is large, and the overcurrent capacity is poor.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide a battery device, and further to at least improve connection stability of a pole and a bus bar to some extent.

The present disclosure provides a battery device including:

a battery including a post;

the busbar comprises a pole connecting part, the pole is welded to the pole connecting part, the pole connecting part comprises a first main body layer and a first welding auxiliary layer, and the first welding auxiliary layer is positioned on one side, close to the battery, of the first main body layer;

the pole is provided with an aluminum layer at one end close to the pole connecting part, the first main body layer is a copper layer, and the first welding auxiliary layer is a nickel layer.

The battery device provided by the embodiment of the disclosure comprises a battery and a busbar, wherein the battery is provided with a pole, the busbar comprises a pole connecting part, the pole connecting part and pole welding are performed, the pole connecting part comprises a first main body layer and a first welding auxiliary layer, the first welding auxiliary layer is arranged on one side of the first main body layer, which faces the pole, the pole is provided with an aluminum layer, the first main body layer is a copper layer, the first welding auxiliary layer is a nickel layer, the auxiliary welding of the welding auxiliary layer made of nickel is performed, the problem that an intermetallic phase is formed in a solidification process after melting when the aluminum layer of the pole and the copper busbar are welded in the prior art, and a welding part with poor mechanical property is easy to crack is solved, the welding effect of the pole and the copper first main body layer is improved, so that the connection stability and the overcurrent capacity of the pole and the busbar are improved, and the resistance of an interface is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic view of a first battery device provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a battery provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a first bus bar provided by an exemplary embodiment of the present disclosure;

fig. 4 is a schematic view of a second battery device provided in an exemplary embodiment of the present disclosure;

fig. 5 is a schematic view of a third battery device provided in an exemplary embodiment of the present disclosure;

fig. 6 is a schematic view of a fourth battery device provided in an exemplary embodiment of the present disclosure.

Reference numerals

10. A battery; 11. a pole; 110. a first battery; 12. a housing; 120. a second battery; 121. a first end plate; 122. a second end plate; 123. a case main body; 20. a busbar; 21. a pole connection portion; 211. a first body layer; 212. a first welding auxiliary layer; 22. a housing connection portion; 221. a second body layer; 222. a second welding auxiliary layer; 23. a transition section; 30. a case; 31. a bottom plate; 32. and (3) a structural beam.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Exemplary embodiments of the present disclosure provide a battery device, as shown in fig. 1, including: a battery 10 and a busbar 20, the battery including a post 11; the busbar 20 includes a post connection portion 21, the post 11 is welded to the post connection portion 21, the post connection portion 21 includes a first main body layer 211 and a first welding auxiliary layer 212, and the first welding auxiliary layer 212 is located at one side of the first main body layer 211 close to the battery 10; wherein, the end of the pole 11 near the pole connecting portion 21 is provided with an aluminum layer, the first main body layer 211 is a copper layer, and the first welding auxiliary layer 212 is a nickel layer.

The battery device provided by the embodiment of the disclosure includes a battery 10 and a busbar 20, a pole 11 is disposed on the battery 10, the busbar 20 includes a pole connection portion 21, the pole connection portion 21 and the pole 11 are welded, the pole connection portion 21 includes a first main body layer 211 and a first welding auxiliary layer 212, the first welding auxiliary layer 212 is disposed on one side of the first main body layer 211 facing the pole 11, the pole 11 is provided with an aluminum layer, the first main body layer 211 is a copper layer, the first welding auxiliary layer 212 is a nickel layer, and the welding auxiliary layer made of nickel is used for auxiliary welding, so that the problem that a welding seam is prone to crack due to poor mechanical properties of a welding seam at a welding position caused by the fact that the aluminum layer of the pole and the copper busbar are melted during welding is avoided, the connection stability and overcurrent capacity of the pole 11 and the busbar 20 are improved, and the resistance of an interface is reduced.

The following will describe each part of the battery device provided in the embodiments of the present disclosure in detail:

the battery device may include a plurality of batteries 10, and the plurality of batteries 10 are distributed in at least one row. The plurality of cells 10 arranged in the first direction are included in one row of cells 10, and when the battery device includes a plurality of rows of cells 10, the plurality of rows of cells 10 may be arranged in the second direction.

In the battery pack, a plurality of batteries 10 need to be electrically connected (in series or in parallel), and the electrical connection of the batteries 10 can be achieved through the bus bars 20. For example, the battery device may have a plurality of battery compartments, one battery pack being provided in each battery compartment, and a plurality of batteries 10 in one battery pack being electrically connected by the bus bars 20.

The battery comprises a shell 12, a battery core and a pole 11, wherein a containing space is arranged in the shell 12, and the battery core is arranged in the containing space. The pole 11 is provided in the housing 12, and the pole 11 is connected to the battery cell. The post 11 may serve as one electrode of the battery 10 and the housing 12 serves as the other electrode of the battery 10. For example, the post 11 is a positive electrode of the battery 10, and the case 12 is a negative electrode of the battery 10.

In one possible embodiment, the battery 10 may be a cylindrical battery and the housing 12 is of cylindrical configuration. As shown in fig. 2, the case 12 may include a case body 123, a first end plate 121, and a second end plate 122, the case body 123 forming a side surface of the battery 10, the case body 123 being of a thin-walled cylindrical structure with both ends open. The first end plate 121 and the second end plate 122 are both circular plate-shaped structures, and the first end plate 121 and the second end plate 122 are respectively plugged at two ends of the case body 123.

In another possible embodiment, the battery 10 may be a hexagonal-prism battery, and the case 12 has a hexagonal-prism structure. The case 12 may include a case body 123, a first end plate 121, and a second end plate 122, the case body 123 forming a side of the battery 10, the case body 123 being of a thin-walled hexagonal-prism structure having both ends open. The first end plate 121 and the second end plate 122 are each of a hexagonal plate-like structure, and the first end plate 121 and the second end plate 122 are respectively plugged at both ends of the case body 123.

The pole 11 may be provided to the first end plate 121 or the second end plate 122. By way of example, the pole 11 is provided on the first end plate 121, and then an explosion-proof valve may be provided on the second end plate 122. When the battery 10 is mounted in the battery device, the end of the battery 10 where the first end plate 121 is disposed faces upward, and the end of the battery 10 where the second end plate 122 is disposed faces downward.

One of the first and second end plates 121 and 122 may be integrally formed with the case body 123, and the other of the first and second end plates 121 and 122 and the case body 123 may be connected by welding or riveting, etc. For example, the first end plate 121 and the case body 123 are integrally formed by pressing, and the second end plate 122 is connected to the case body 123 by welding.

The housing 12 is made of an electrically conductive material and the housing 12 may be a steel shell. Further, the first end plate 121 of the housing 12 connected to the busbar is a steel end plate. The material of the case body 123 and the second end plate 122 may be stainless steel, aluminum, nickel, cadmium, manganese, tungsten, copper, or the like. When the first end plate 121 and the case body 123 are integrally formed, the first end plate 121 and the case body 123 are made of the same material, for example, stainless steel. The material of the second end plate 122 may be the same as or different from that of the case body 123, and the embodiment of the present disclosure is not limited thereto.

In the embodiment of the disclosure, the battery 10 is exemplified by a cylindrical battery (especially, a large cylindrical battery, the diameter of which is 46mm or more, for example, 4680 battery, the diameter of which is 46mm, and the height of which is 80 mm) or a hexagonal battery, and in practical application, the battery 10 is not limited to this, and for example, the battery 10 may be a triangular battery or a quadrangular battery.

The battery cell is disposed in the housing 12, and may include a battery cell body and a tab extending from an end of the battery cell body. The battery core main body can be provided with a first tab and a second tab, the first tab is connected with the pole 11, and the second tab is connected with the shell 12. For example, the first tab is a positive tab, the second tab is a negative tab, the post 11 is a positive electrode of the battery 10, and the case 12 is a negative electrode of the battery 10.

In one possible embodiment, the first tab and the second tab extend from the same side of the cell body. For example, the first tab and the second tab are both disposed on a side of the cell body near the first end plate 121. The first tab is connected to the post 11 provided on the first terminal plate 121, and the second tab is connected to the first terminal plate 121.

In another possible embodiment, the first tab and the second tab extend from two ends of the cell body. For example, the first tab is disposed on a side of the battery cell body near the first end plate 121, and the second tab is disposed on a side of the battery cell body near the second end plate 122. The first tab is connected to the pole 11 on the first end plate 121, the second tab is connected to the second end plate 122, and the first end plate 121 and the second end plate 122 are conducted through the case body 123.

In the embodiment of the disclosure, the battery cell may be a winding type battery cell, and winding the first pole piece, the second pole piece opposite to the first pole piece, and the diaphragm sheet disposed between the first pole piece and the second pole piece to obtain the winding type battery cell. The first tab may extend from an edge of the first pole piece and the second tab may extend from an edge of the second pole piece. The first tab and the second tab are formed with a plurality of single-piece tabs made of metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

An aluminum layer is provided on the first end of the pole 11 near the pole connecting portion 21, that is, the material of the contact portion between the pole 11 and the pole connecting portion 21 is aluminum. For example, the pole 11 is an aluminum pole, that is, the pole 11 is formed entirely of aluminum. Alternatively, the pole 11 is a composite pole formed of a plurality of metal layers, and an aluminum layer in the plurality of metal layers is adjacent to the pole connection portion 21. For example, the composite pole is formed by stacking a copper layer and an aluminum layer, or the composite pole is formed by sequentially stacking an aluminum layer, a copper layer and an aluminum layer. Of course, in practical applications, the multiple metal layers in the composite pole may be arranged in other forms, which is not limited in this disclosure.

The pole 11 is disposed on the first end plate 121, for example, a through hole is disposed on the first end plate 121, and the pole 11 is disposed through the through hole. The pole 11 is partially located inside the housing 12, the pole 11 is partially located outside the housing 12, the portion located inside the housing 12 is connected to the tab, and a protrusion is formed on the first end plate 121 for the portion outside the housing 12, and the protrusion is used for welding with the busbar 20.

It is noted that in the embodiment of the present disclosure, the pole 11 is one electrode of the battery 10, the case 12 is the other electrode of the battery 10, and in order to avoid the short circuit between the two electrodes of the battery 10, the pole 11 and the case 12 are insulated. For example, an insulating element is provided between the pole 11 and the housing 12, by means of which insulating element the pole 11 and the housing 12 are insulated.

The bus bar 20 is used to electrically connect at least two batteries 10, for example, the bus bar 20 connects a first battery 110 and a second battery 120, and the first battery 110 and the second battery 120 are two adjacent batteries 10. When the batteries 10 in the battery device are distributed in a plurality of rows, the first battery 110 and the second battery 120 may be two adjacent batteries 10 in one row of the batteries 10.

As shown in fig. 3, the bus bar 20 may include a post connection portion 21 and a case connection portion 22, the post connection portion 21 and the case connection portion 22 being connected, the post connection portion 21 being for connecting the post 11 of the first battery 110, the case connection portion 22 being for connecting the case 12 of the second battery 120, the series connection of the first battery 110 and the second battery 120 being achieved.

Alternatively, the post connection portion 21 and the case connection portion 22 may form one bus unit for connecting two adjacent cells 10 in a row of cells 10 in series. The bus bar 20 includes a plurality of bus units, which are sequentially connected, and which are arranged in the second direction. The plurality of bus bar units are connected to realize parallel connection of the plurality of rows of the batteries 10.

The pole 11 is provided on one end face of the case 12 of the battery 10, and the pole 11 forms a protrusion on the end face of the case 12 of the battery 10. There is a height difference between the top surface of the pole 11 and the end plate, and a pole connection portion 21 is connected to the top of the pole 11, and a housing connection portion 22 is connected to the end plate. In order to ensure that the pole connection part 21 and the pole 11 are in close contact and the case connection part 22 and the end plate are in close contact, the pole connection part 21 and the case connection part 22 are arranged in a staggered manner, that is, a height difference is provided between the pole connection part 21 and the case connection part 22.

On this basis, the busbar 20 may further comprise a transition portion 23, the transition portion 23 connecting the post connection portion 21 and the housing connection portion 22, respectively. The pole connection portion 21 and the housing connection portion 22 may be disposed in parallel, the pole connection portion 21 and the housing connection portion 22 having a height difference, and an orthographic projection of the pole connection portion 21 on the housing connection portion 22 being located outside a range of the housing connection portion 22. The transition portion 23 extends from the edge of the pole connection portion 21 near the housing connection portion 22 to the edge of the housing connection portion 22 near the pole connection portion 21.

The tab connection part 21 may include a first body layer 211 and a first welding auxiliary layer 212, the first welding auxiliary layer 212 being provided at a side of the first body layer 211 facing the battery 10. The first main body layer 211 is a copper layer, the first welding auxiliary layer 212 is a nickel layer, the nickel layer is arranged between the copper layer and the aluminum layer of the pole 11, and the nickel layer has good welding performance during welding, so that the welding effect of the copper busbar 20 and the aluminum pole can be improved, and the connection stability of the pole 11 and the busbar 20 is improved.

In a possible embodiment, as shown in fig. 4, the first body layer 211 is provided with a first soldering region for soldering the pole 11, and the first soldering auxiliary layer 212 is provided on the first soldering region. By providing the first welding auxiliary layer 212 at the first welding region on the first body layer 211, the welding performance of the terminal connection part 21 can be effectively improved.

Wherein the first land may be a circular or near circular area. The first welding auxiliary layer 212 may be provided at a surface of the first welding region facing the battery 10. For example, the first welding auxiliary layer 212 may be coupled to the surface of the first body layer 211 by an explosion compounding method, diffusion welding, friction welding, brazing, rolling compounding method, or hot melt rolling method.

Alternatively, a recess may be formed on the surface of the side of the first soldering region near the pole 11, and the first soldering auxiliary layer 212 is embedded in the recess of the first soldering region. The area of the recess may be greater than or equal to the area of the pole 11, and the orthographic projection of the pole 11 on the pole connection 21 coincides at least partially with the recess. The first welding auxiliary layer 212 may be embedded in the recess portion by explosion cladding, diffusion welding, friction welding, soldering, rolling cladding, hot melt rolling, or the like.

When the first welding auxiliary layer 212 is embedded in the recess, a surface of the first welding auxiliary layer 212 facing the battery 10 and a surface of the first body layer 211 facing the battery 10 are flush, or a surface of the first welding auxiliary layer 212 facing the battery 10 may slightly protrude from the surface of the first body layer 211 facing the battery 10.

In another possible embodiment, as shown in fig. 5, the side of the first body layer 211 facing the battery 10 is a plane, and the first welding auxiliary layer 212 is disposed over the side of the first body layer 211 facing the battery 10. The first welding auxiliary layer 212 is disposed on the side of the first main body layer 211 facing the battery 10, so that the formation of the pole connection portion 21 is facilitated, the processing process is saved, and the problem that the first welding auxiliary layer 212 and the pole 11 may be dislocated due to assembly errors and the like can be avoided.

Wherein the shape of the first welding auxiliary layer 212 may be matched with the shape of the first body layer 211. The first welding auxiliary layer 212 may be coupled to the surface of the first body layer 211 facing the battery 10 by explosion bonding, diffusion welding, friction welding, soldering, roll bonding, hot melt rolling, or the like.

In the embodiment of the present disclosure, the thickness of the first welding auxiliary layer 212 is a, the thickness of the tab connection portion 21 is b, and the ratio of a to b is 0.01-0.1. Further, the ratio of a to b is 0.02-0.05. For example, the ratio of a to b is 0.02, 0.03, 0.05, or the like. By setting the ratio of the thickness of the first auxiliary welding layer 212 to the thickness of the pole connection portion to 0.01-0.1, on one hand, the problem that the plating layer is peeled off or falls off due to the fact that the first auxiliary welding layer is too thick can be avoided by avoiding the first auxiliary welding layer being too small in thickness so as to meet the welding quality requirement, and on the other hand, the cost is saved, meanwhile, the thickness and the weight of the busbar 20 are effectively controlled, the busbar 20 is prevented from occupying more space, and the energy density of the battery device is improved.

The case connection part 22 includes a second body layer 221 and a second welding auxiliary layer 222, the second body layer 221 and the first body layer 211 are connected, and the second body layer 221 and the first body layer 211 have a height difference in a first direction, which is a direction perpendicular to a face of the case 12 where the pole 11 is disposed. The second main body layer 221 is provided with a second welding area for welding with the shell 12, the second welding auxiliary layer 222 is arranged on the second welding area, and the second welding auxiliary layer 222 is a nickel layer.

By way of example, the material of the housing 12 may be stainless steel and the material of the second body layer 221 copper, with a weld between the housing 12 and the second body layer 221. The second welding auxiliary layer 222 is provided on the second main body layer 221, so that the consistency of the housing connection portion 22 and the pole connection portion 21 can be improved, and the processing is facilitated.

In practical applications, the second auxiliary welding layer 222 may not be disposed on the second main body layer 221, that is, the second main body layer 221 may be directly welded to the housing 12. The direct welding of the second body layer 221 to the case 12 can save the production cost of the battery because nickel is expensive.

In a possible embodiment, the second body layer 221 is provided with a second soldering region for soldering the housing 12, and the second soldering auxiliary layer 222 is provided on the second soldering region. By providing the second welding auxiliary layer 222 at the second welding region on the second body layer 221, the welding performance of the case connecting part 22 can be effectively improved.

The second solder printing area can be an arc area. The second welding auxiliary layer 222 may be provided at a surface of the second welding region facing the battery 10. For example, the second welding auxiliary layer 222 may be coupled to the surface of the second body layer 221 by an explosion compounding method, diffusion welding, friction welding, brazing, rolling compounding method, or hot melt rolling method.

Alternatively, a recess may be formed in the second bonding pad, and the second bonding auxiliary layer 222 is embedded in the recess of the second bonding pad. The second welding auxiliary layer 222 may be embedded in the recess portion by explosion cladding, diffusion welding, friction welding, brazing, rolling cladding, hot melt rolling, or the like.

When the second welding auxiliary layer 222 is embedded in the recess, a surface of the second welding auxiliary layer 222 facing the battery 10 and a surface of the second body layer 221 facing the battery 10 are flush, or a surface of the second welding auxiliary layer 222 facing the battery 10 may slightly protrude from the surface of the second body layer 221 facing the battery 10.

In another possible embodiment, the side of the second body layer 221 facing the battery 10 is a plane, and the second welding auxiliary layer 222 is disposed over the side of the second body layer 221 facing the battery 10. The second welding auxiliary layer 222 is disposed on the side of the second main body layer 221 facing the battery 10, which is convenient for forming the case connection part 22 and saves the processing process.

Wherein the shape of the second welding auxiliary layer 222 may be matched with the shape of the second body layer 221. The second welding auxiliary layer 222 may be coupled to the surface of the second body layer 221 facing the battery 10 by explosion cladding, diffusion welding, friction welding, soldering, roll cladding, hot melt rolling, or the like.

It is noted that the first body layer 211 and the second body layer 221 may be a unitary structure in embodiments of the present disclosure. For example, the first body layer 211 and the second body layer 221 are formed by stamping from the same blank. At the time of stamping, a transition 23 is formed between the first body layer 211 and the second body layer 221. The first welding auxiliary layer 212 and the second welding auxiliary layer 222 may be of a split type structure, for example, no nickel layer is provided at the transition portion 23. Of course, in practical applications, a nickel layer may be disposed on the side of the transition portion 23 facing the battery 10, and the nickel layer connects the first welding auxiliary layer 212 and the second welding auxiliary layer 222, that is, the side of the busbar 20 facing the battery 10 is covered with the nickel layer.

The pole connection portion 21 and the pole 11 are connected by laser welding, and the case connection portion 22 and the case 12 can be connected by laser welding. Of course, in practical application, the pole connection portion 21 and the pole 11 may be welded by other welding methods such as friction welding or resistance welding, and the housing connection portion 22 and the housing 12 may be welded by other welding methods such as friction welding or resistance welding, which is not limited to this embodiment of the disclosure.

The battery device provided by the embodiment of the disclosure may be a battery pack, a battery module, a battery pack or the like. When the battery device is a battery pack, the battery device may further include a case 30, a battery bracket, a heat exchange plate, and the like, as shown in fig. 6. The case 30 may include a bottom plate 31 and a plurality of structural beams 32, the plurality of structural beams 32 being disposed on the bottom plate 31 to form at least one battery compartment, the battery carrier being disposed on the battery compartment, and the battery 10 being disposed on the battery carrier. The heat exchange plates are provided between two adjacent rows of cells 10.

The battery device provided by the embodiment of the disclosure includes a battery 10 and a busbar 20, a pole 11 is disposed on the battery 10, the busbar 20 includes a pole connection portion 21, the pole connection portion 21 and the pole 11 are welded, the pole connection portion 21 includes a first main body layer 211 and a first welding auxiliary layer 212, the first welding auxiliary layer 212 is disposed on one side of the first main body layer 211 facing the pole 11, the pole 11 has an aluminum layer, the first main body layer 211 is a copper layer, the first welding auxiliary layer 212 is a nickel layer, the welding auxiliary layer made of nickel is used for auxiliary welding, the problem that a welding seam is prone to cracking due to poor mechanical properties of the welding seam at the welding position caused by the fact that the aluminum layer of the pole and the copper busbar are melted in the related art is avoided, and therefore, the connection stability and overcurrent capacity of the pole 11 and the busbar 20 are improved, and the resistance of an interface is reduced.

The battery device provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery device is used for the electric vehicle, the battery device can be a battery pack which is installed on the electric vehicle and provides energy for the electric vehicle.

In practice, the battery pack may be mounted to the frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modularized battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A battery device, characterized in that the battery device comprises:

a battery including a post;

the busbar comprises a pole connecting part, the pole is welded to the pole connecting part, the pole connecting part comprises a first main body layer and a first welding auxiliary layer, and the first welding auxiliary layer is positioned on one side, close to the battery, of the first main body layer;

the pole is provided with an aluminum layer at one end close to the pole connecting part, the first main body layer is a copper layer, and the first welding auxiliary layer is a nickel layer.

2. The battery device of claim 1, wherein a first land for welding the post is provided on the first body layer, and the first welding auxiliary layer is provided on the first land.

3. The battery device according to claim 2, wherein a surface of the first welding area on a side close to the pole is provided with a recess, and the first welding auxiliary layer is embedded in the recess.

4. The battery device of claim 1, wherein a face of the first body layer facing the battery is planar, and the first welding auxiliary layer is disposed over the face of the first body layer facing the battery.

5. The battery device of claim 1, wherein the battery further comprises:

the pole is arranged on the shell, and protrudes out of the surface of the shell, and the shell is a steel shell;

the bus bar further includes:

the shell connecting part is connected with the pole connecting part;

the battery device comprises a battery device, a first battery, a second battery, a shell connecting part and a pole connecting part, wherein the pole connecting part is connected with a pole of the first battery, the shell connecting part is connected with a shell of the second battery, and the first battery and the second battery are two adjacent batteries in the battery device.

6. The battery device according to claim 5, wherein the case connecting portion includes:

the second main body layer is connected with the first main body layer, the second main body layer and the first main body layer are provided with height differences in a first direction, the first direction is perpendicular to the direction of one face of the shell, where the pole is arranged, and the second main body layer is a copper layer.

7. The battery device according to claim 1, wherein the first welding auxiliary layer has a thickness a, the terminal connection portion has a thickness b, and a ratio of a to b is 0.01 to 0.1.

8. The battery device of claim 7, wherein the ratio of a to b is 0.02-0.05.

9. The battery device of any one of claims 1-8, wherein the post connection portion and the post are connected by laser welding.

10. The battery device according to any one of claims 1 to 8, wherein the battery is a cylindrical battery or a hexagonal-prism battery.