CN219575873U

CN219575873U - Battery assembly

Info

Publication number: CN219575873U
Application number: CN202320799765.0U
Authority: CN
Inventors: 赵冬
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-10
Filing date: 2023-04-10
Publication date: 2023-08-22
Anticipated expiration: 2033-04-10

Abstract

The battery assembly comprises a plurality of batteries and a bus bar, wherein the batteries are sequentially arranged, the battery comprises a battery body and a pole, the battery body is provided with two oppositely arranged first surfaces and a plurality of second surfaces positioned between the two first surfaces, and the pole is arranged on the first surface of the battery body; the busbar comprises a main body part, a first bending part and a second bending part, wherein the first bending part and the second bending part are respectively connected to two ends of the main body part, and the first bending part and the second bending part bend towards one side, close to the battery, of the main body part; the first bending part is connected with the pole of the first battery, and the second bending part is connected with the pole of the second battery. The simple saving technology of connection is favorable to promoting battery device's production efficiency to the busbar can absorb the expansion force, promotes the connection stability of busbar.

Description

Battery assembly

Technical Field

The disclosure relates to the field of battery technology, and in particular relates to a battery assembly.

Background

Battery devices are often provided in electric vehicles for powering the electric vehicles. The battery device includes a plurality of batteries electrically connected (in series or in parallel). In the related art, a pole is arranged on a battery, a bus plate is connected to the pole, and the bus plates of adjacent batteries are connected when a plurality of batteries are electrically connected. Therefore, the bus bars are required to be connected to the pole, and then the two bus bars are connected, so that the connection is complex, and the production efficiency of the battery device is low.

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 assembly, and further to at least improve the production efficiency of the battery assembly to some extent.

The present disclosure provides a battery assembly, the battery assembly comprising:

the battery comprises a battery body and a pole, wherein the battery body is provided with two oppositely arranged first surfaces and a plurality of second surfaces positioned between the two first surfaces, the area of the first surfaces is larger than that of the second surfaces, and the pole is arranged on the first surface of the battery body;

the busbar comprises a main body part, a first bending part and a second bending part, wherein the first bending part and the second bending part are respectively connected to two ends of the main body part, and the first bending part and the second bending part are bent towards one side, close to the battery, of the main body part;

the first bending part is connected with the pole of the first battery, the second bending part is connected with the pole of the second battery, the second bending part is of a flat plate structure, the first battery and the second battery are a plurality of two adjacent batteries in the batteries, and the orthographic projection of the second bending part on the plane where the second bending part is located is provided with a non-overlapping area.

The battery pack provided by the embodiment of the disclosure comprises a plurality of batteries and a bus bar, wherein the bus bar comprises a main body part, a first bending part and a second bending part, the first bending part and the second bending part are respectively connected with the main body part, the first bending part and the second bending part are bent towards one side, close to the battery, of the main body part, the first bending part is connected with a pole column of the first battery, the second bending part is connected with a pole column of the second battery, the connection is simple, the process is saved, the production efficiency of the battery pack is improved, expansion force can be absorbed by the bus bar, and the connection stability of the bus bar is improved.

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 battery assembly provided in an exemplary embodiment of the present disclosure;

fig. 2 is a partial enlarged view of a battery assembly provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a battery provided in an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram of a bus bar according to an exemplary embodiment of the present disclosure.

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.

The exemplary embodiment of the present disclosure provides a battery assembly, as shown in fig. 1 to 4, including a plurality of batteries 10 and a bus bar 20, the plurality of batteries 10 being sequentially arranged, the battery including a battery body 11 and a post 12, the battery body 11 having two oppositely disposed first surfaces 101 and a plurality of second surfaces 102 located between the two first surfaces 101, the first surfaces 101 having an area larger than that of the second surfaces 102, the post 12 being provided on the first surfaces 101 of the battery body 11; the bus bar 20 includes a main body portion 22, a first bent portion 21 and a second bent portion 23, the first bent portion 21 and the second bent portion 23 being connected to both ends of the main body portion 22, respectively, and the first bent portion 21 and the second bent portion 23 being bent toward a side of the main body portion 22 near the battery 10; the first bending portion 21 is connected to the post 12 of the first battery 110, the second bending portion 23 is connected to the post 12 of the second battery 120, the second bending portion 23 has a flat structure, and the first battery 110 and the second battery 120 are two adjacent batteries 10 of the plurality of batteries 10.

The battery pack provided by the embodiment of the disclosure includes a plurality of batteries 10 and a busbar 20, the busbar 20 includes a main body portion 22, a first bending portion 21 and a second bending portion 23, the first bending portion 21 and the second bending portion 23 are respectively connected with the main body portion 22, and the first bending portion 21 and the second bending portion 23 bend towards one side of the main body portion 22, which is close to the battery 10, the first bending portion 21 is connected with a pole 12 of the first battery 110, the second bending portion 23 is connected with a pole 12 of the second battery 120, the connection is simple, the process is saved, the production efficiency of the battery device is improved, and the busbar 20 can absorb expansion force, and the connection stability of the busbar 20 is improved.

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

the battery comprises a battery body 11 and a pole 12, wherein the battery body 11 comprises two opposite first surfaces 101 and four second surfaces 102 arranged around the first surfaces 101, namely, the battery body 11 is of an approximate rectangular structure, namely, the battery body 11 can be of a rectangular structure when errors in processing and manufacturing are ignored, and the like.

The two opposing first surfaces 101 are large surfaces of the battery body 11, and the four second surfaces 102 are small surfaces of the battery body 11, and the four second surfaces 102 include two pairs of small surfaces, i.e., a pair of long second surfaces extending in the length direction of the battery body 11, and a pair of short second surfaces extending in the width direction of the battery body 11, and the areas of the long second surfaces are larger than the areas of the short second surfaces, but are smaller than the areas of the large surfaces. The pole 12 is arranged on the first surface 101, so that a reliable supporting surface of the pole 12 can be ensured, and the stability of the pole 12 can be ensured.

One first surface 101 of the battery body 11 is provided with a pole 12, and the other first surface 101 of the battery body 11 is provided with a recess, and the recess and the orthographic projection area on the first surface 101 where the pole 12 is located are at least partially overlapped with the pole 12. By providing the recess in the first surface 101 of the battery 10 remote from the pole 12, interference between the pole 12 and the battery body 11 when the batteries 10 are stacked can be avoided.

The main body 22 is opposite to a short second surface of the battery body 11, and a recess portion on the main body 22 penetrates the short second surface opposite to the main body 22. The first bending part 21 is at least partially located in a concave part of the battery 10 on one side of the first battery 110 away from the second battery 120, and the second bending part 23 is at least partially located in the concave part of the first battery 110.

In one embodiment, the battery body 11 comprises a battery cell and a housing, the battery cell being connected to the pole 12; the battery cell is positioned in the shell; the recess and the pole 12 are disposed on the housing, which is convenient to install and has a relatively simple structure, and the housing can be used for installing the pole 12.

Alternatively, the shell can be made of stainless steel or aluminum, and has good corrosion resistance and enough strength. The thickness of casing homogeneous phase is unanimous, and not only structural stability is stronger, and can convenient processing.

The housing may comprise a first housing part 14 and a second housing part 15, the second housing part 15 being connected to the first housing part 14 to enclose the battery cells. The first shell member 14 and the second shell member 15 are respectively arranged, so that the installation of the battery cell can be facilitated, and the processing is also relatively convenient. One of the recess and the pole 12 is provided on the first housing part 14 and the other is provided on the second housing part 15, so that a sufficient installation space is ensured and the strength of the structure can be ensured.

In a possible embodiment, the first housing part 14 and the second housing part 15 may each be formed with a receiving cavity, and the battery cells are located in the cavity formed by the two receiving cavities after the first housing part 14 and the second housing part 15 are butted. The first housing member 14 and the second housing member 15 may have the same or different receiving cavity depths, and are not limited herein.

In another possible embodiment, the first housing part 14 is a flat plate, the second housing part 15 is formed with a receiving cavity, the battery cell is located in the receiving cavity, and the flat plate is arranged to facilitate subsequent connection and has lower processing difficulty.

Wherein the circumferential edge of the second housing part 15 is provided with a flange, and the first housing part 14 is welded with the flange, whereby a reliable welding of the first housing part 14 and the second housing part 15 can be ensured, providing stability of the connection. The flange is arranged mainly to ensure that the welding area is increased, so that the welding stability is improved.

Alternatively, when both the first housing part 14 and the second housing part 15 have receiving cavities, the circumferential edge of the first housing part 14 may also be provided with a flange, the flange of the first housing part 14 being welded to the flange of the second housing part 15.

It should be noted that the flange may be understood as a flange, for example, a flange extending outwardly from a peripheral outer edge of a plate or a flange extending outwardly from a sidewall of a structure having a receiving cavity, where the flange is substantially perpendicular to the sidewall. Reference is made to this arrangement for the provision of flanges on the circumferential edges of the first housing part 14 and the second housing part 15 as mentioned in the above embodiments, so that the flanges of the first housing part 14 and the flanges of the second housing part 15 can be directly opposed to each other, thereby facilitating connection.

The battery cell comprises a battery cell main body and a tab, and the tab extends out from the length direction of the battery cell main body; the tab is connected with the pole 12, and the pole 12 can be disposed at an end of the battery body 11, so that the connection is convenient, and the length space of the battery 10 can be fully utilized. The tab and the pole 12 may be directly connected, that is, the tab and the pole 12 may be directly welded, or the tab and the pole 12 may be connected through a metal switching piece, and a specific connection manner may be a manner of welding, or a manner of using riveting is not excluded, which is not limited herein.

In some embodiments, there are two poles 12, two poles 12 are positive pole and negative pole respectively, two lugs are also, the two lugs are respectively a positive lug and a negative lug, the positive pole is connected with the positive lug, and the negative pole is connected with the negative lug.

It should be noted that, the insulation between the pole 12 and the housing may be, for example, an insulation member may be used for insulation between the pole 12 and the housing, or an insulation coating may be used for insulation, which is not limited herein, and may be selected according to practical requirements.

The bus bar 20 includes a main body portion 22, a first bent portion 21 and a second bent portion 23, the first bent portion 21 and the second bent portion 23 are connected to both ends of the main body portion 22, respectively, and the first bent portion 21 and the second bent portion 23 are bent toward one side of the main body portion 22 near the battery 10. The first bending portion 21 is connected to the post 12 of the first battery 110, the second bending portion 23 is connected to the post 12 of the second battery 120, and the first battery 110 and the second battery 120 are two adjacent batteries 10 of the plurality of batteries 10.

The bus bar 20 is generally C-shaped or approximately C-shaped in configuration, and the bus bar 20 absorbs expansion forces better. In the aspect of the assembly process, the stacking of the batteries 10 and the welding of the bus bars 20 are completed at the same station, so that the length and the complexity of a production line of the batteries 10 are greatly reduced, and the battery module is formed in one step.

The busbar 20 may be an integrally formed structure, for example, the busbar 20 is formed by bending a blank, and both ends of the blank are bent to the same side to form the busbar 20. Or the buss bar 20 may be formed from a one-piece blank by milling or the like. Of course, in practical applications, the bus bar 20 may be a split-type structure, which is not limited in the embodiments of the disclosure.

The orthographic projection of the second bending part 23 and the first bending part 21 on the plane of the second bending part 23 has a non-overlapping area. The first bent portion 21 is welded to the post 12 of the first battery 110, and the second bent portion 23 is welded to the post 12 of the second battery 120. The projection of the first bending part 21 is not overlapped with the second bending part 23, so that the first bending part 21 and the second bending part 23 are not interfered with each other during welding, and welding is facilitated. For example, when the first bending portion 21 is located above the second bending portion 23, the projection of the first bending portion 21 and the second bending portion 23 do not overlap, so that the second bending portion 23 is partially exposed out of the first bending portion 21, and therefore the first bending portion 21 does not completely block the second bending portion 23 during welding, thereby improving welding convenience.

Optionally, the forward projection area of the first bending portion 21 on the first surface 101 of the battery body 11 and the forward projection area of the second bending portion 23 on the first surface 101 of the battery body 11 at least partially overlap. The projections of the first bending part 21 and the second bending part 23 on the first surface 101 are at least partially overlapped, so that the total connection area of the battery 10 and the busbar 20 can be reduced, the area of the pole 12 on the battery 10 is effectively controlled, the problem that the pole 12 occupies the first surface 101 of the battery 10 is excessively large is avoided, and the energy density of the battery 10 is improved.

Illustratively, the area of the first bend 21 is smaller than the area of the second bend 23. That is, the second bending portion 23 is at least partially exposed outside the first bending portion 21, and the first bending portion 21 does not completely block the second bending portion 23 during welding, thereby improving the welding convenience. Wherein, the projection area of the first bending part 21 at the second bending part 23 may be located inside the second bending part 23. The dimension of the first bending portion 21 in the longitudinal direction of the battery 10 is smaller than the dimension of the second bending portion 23 in the longitudinal direction of the battery 10.

The first bending portion 21 and the second bending portion 23 are parallel. In the embodiment of the present disclosure, the first bending portion 21 and the second bending portion 23 are parallel, which may be understood as the first bending portion 21 and the second bending portion 23 are substantially parallel, that is, the first bending portion 21 and the second bending portion 23 are parallel if specific process errors and the like are considered, that is, if errors in manufacturing and the like are ignored. For example, the acute angle between the first bending portion 21 and the second bending portion 23 is 0 degrees to 5 degrees.

The first bending portion 21 is perpendicular to the main body portion 22, and the second bending portion 23 is perpendicular to the main body portion 22. In the presently disclosed embodiment, the first bending portion 21 and the main body portion 22 may be understood to be substantially perpendicular to the first bending portion 21 and the main body portion 22. The first bending portion 21 and the main body portion 22 are substantially perpendicular, and specific process errors are considered, that is, if errors in processing and manufacturing are ignored, an included angle formed between the first bending portion 21 and the main body portion 22 is a right angle. Optionally, the included angle between the first bending portion 21 and the main body portion 22 is 80 degrees to 100 degrees. And a rounded corner is provided between the first bending portion 21 and the main body portion 22.

The projection of the body portion 22 onto the surface of the body of the battery 10 on which the first surface 101 is located outside the first surface 101. That is, the main body 22 and the battery 10 are located outside the battery 10, interference between the main body 22 and the battery 10 is avoided, and a gap exists between the main body 22 and the battery 10, so that the electrical distance between the busbar 20 and the battery 10 shell is increased, and the safety performance of the battery 10 is improved.

The first bent portion 21 is welded to the post 12 of the first battery 110, and the second bent portion 23 is welded to the post 12 of the second battery 120. The first bending portion 21 has a first welding area, the second bending portion 23 has a second welding area, the thickness of the first welding area is equal to or less than the thickness of the main body portion 22, and the thickness of the second welding area is equal to or less than the thickness of the main body portion 22.

The projection of the pole 12 of the first battery 110 at the first bending part 21 is at least partially located at the first welding area, and the projection of the pole 12 of the second battery 120 at the second bending part 23 is at least partially located at the second welding area. The side of the pole 12 away from the battery body 11 may be a plane, that is, the side of the pole 12 away from the battery body 11 has no protruding structure. The surface of the pole 12 far away from the battery body 11 is set to be a plane, so that the processing of the pole 12 is facilitated, and the height of the pole 12 can be effectively reduced without arranging a protruding part on the surface of the pole 12, so that the space is saved.

In the embodiment of the present disclosure, the bus bar 20 may be formed by a thin plate material, and the body portion 22, the first bent portion 21, and the second bent portion 23 may be regarded as a flat plate structure. A fillet or chamfer is provided at a portion where the first bending portion 21 and the main body portion 22 are connected, and a fillet or chamfer is provided at a portion where the second bending portion 23 and the main body portion 22 are connected. The first bending portion 21 and the main body portion 22 are perpendicular to each other, and the first bending portion 21 and the second bending portion 23 are parallel to each other, and the large surfaces of the plates forming the first bending portion 21 and the second bending portion 23 are perpendicular to each other.

It should be noted that, the battery assembly provided in the embodiments of the present disclosure may be a battery pack, a battery module, or a battery pack. When the battery assembly is a battery pack, the battery assembly includes a plurality of sequentially arranged batteries 10, the first surfaces 101 of adjacent batteries 10 are opposite, and the adjacent batteries 10 are connected by the bus bars 20. When the battery assembly is a battery module, the battery module may include a first end plate, a second end plate, and a plurality of batteries 10, the first end plate and the second end plate being disposed opposite to each other, the plurality of batteries 10 being sequentially arranged between the first end plate and the second end plate, the plurality of batteries 10 being electrically connected through a bus bar 20.

When the battery assembly is a battery pack, the battery assembly may include a plurality of batteries 10 and a housing including a base plate and a rim connected to the base plate to form at least one battery 10 compartment on the base plate, the batteries 10 being disposed in the battery 10 compartment. A second surface 102 of the battery 10 is opposite the base plate, and further a long second surface of the battery 10 is opposite the base plate, and the short second surface of the battery 10 is perpendicular to the base plate with the first surface 101. The buss bar 20 is provided on the side of the battery 10, i.e. the main body portion 22 of the buss bar 20 is opposite to one short second surface of the battery 10.

Wherein the main body portion 22 and the short second surface have a preset distance therebetween, the preset distance being 1mm-5mm. For example, the distance between the main body portion 22 and the short second surface is 1mm, 2mm, 3mm, 4mm, 5mm, or the like. The distance between the main body 22 and the short second surface is set to 1mm-5mm, which avoids the problem that the preset distance is too large to waste space, is unfavorable for the energy density improvement and also avoids the problem that the preset distance is too small to meet the insulation and voltage withstanding requirement.

The battery assembly provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery assembly is used for the electric vehicle, the battery assembly 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

1. A battery assembly, the battery assembly comprising:

2. The battery assembly of claim 1, wherein the first bend has an area that is smaller than an area of the second bend.

3. The battery assembly of claim 2, wherein a dimension of the first bend in the battery length direction is smaller than a dimension of the second bend in the battery length direction.

4. The battery assembly of any of claims 1-3, wherein the first bend and the second bend are parallel.

5. The battery assembly of claim 4, wherein the first bend portion and the main body portion are perpendicular.

6. The battery assembly of claim 5, wherein a projection of the body portion on a plane of the first surface of the battery body is located outside the first surface.

7. The battery assembly of claim 6, wherein the first bend is welded to the post of the first cell and the second bend is welded to the post of the second cell.

8. The battery assembly of claim 7, wherein the first bend has a first weld zone and the second bend has a second weld zone, the first weld zone having a thickness less than or equal to the thickness of the body portion and the second weld zone having a thickness less than or equal to the thickness of the body portion.

9. The battery assembly of claim 1, wherein the forward projection of the first bend at the first surface of the battery body and the forward projection of the second bend at the first surface of the battery body at least partially overlap.

10. The battery assembly of claim 1, wherein one first surface of the battery body is provided with the post, the other first surface of the battery body is provided with a recess, and the recess and an orthographic projection area on the first surface on which the post is located at least partially coincide with the post;

the battery body comprises two long second surfaces and two short second surfaces, the length of the long second surfaces is larger than that of the short second surfaces, the main body part is opposite to one short second surface of the battery body, and the concave part on the main body part penetrates through the short second surfaces opposite to the main body part.

11. The battery assembly of claim 10, wherein the body portion and the short second surface have a predetermined distance therebetween, the predetermined distance being 1mm-5mm.