CN220628022U

CN220628022U - Battery pack

Info

Publication number: CN220628022U
Application number: CN202321909318.2U
Authority: CN
Inventors: 陈亮; 夏明博; 温世标
Original assignee: Xinwangda Power Technology Co ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2024-03-19
Anticipated expiration: 2033-07-19

Abstract

The application relates to a battery pack, which comprises a box body, single batteries, lifting lugs and a first connecting assembly, wherein the box body comprises a plurality of bearing beams, and the bearing beams are connected and define a containing cavity; the single battery is arranged in the accommodating cavity; the lifting lug is provided with a first through hole; the first connecting component part sequentially penetrates through the first through hole and the bearing beam so as to connect the lifting lug with the bearing beam in a threaded manner. Foretell battery package utilizes first coupling assembling to connect lug and load beam spiro union, and the simple operation can promote production efficiency under the prerequisite of guaranteeing structural strength. In addition, the deformation of the box body can not be caused by adopting the connection mode of the screw connection, so that the flatness of the box body after connection is improved, the yield is improved, and the production cost is effectively reduced. Because the spiro union belongs to one kind of detachable connection, can provide convenience for later stage's safety maintenance, improve spare part's reuse amount, reduce maintenance cost.

Description

Battery pack

Technical Field

The application relates to the technical field of lithium batteries, in particular to a battery pack.

Background

The battery pack is used as a core component of the new energy automobile, and the safety performance of the battery pack is important for driving safety. The stability of connection of the box body and the lifting lug in the battery pack can influence the service life, the structural strength, the maintenance difficulty and the like of the battery pack to a great extent.

At present, the box body and the lifting lug are connected in a general welding mode in the industry, and the welding mode is complex in operation and long in working time, is unfavorable for improving the production efficiency of the battery pack, and can further cause the deformation of the box body of the battery pack at a welding position, so that the flatness of the surface of the box body is reduced. In addition, the welding process is irreversible, so that the battery pack is not convenient to repair and disassemble in the later period. Therefore, the conventional method for fixing the battery pack box body and the lifting lug through welding brings great problems to production and after-sale.

Disclosure of Invention

Based on the above, it is necessary to provide a battery pack with high production efficiency and low maintenance difficulty.

The battery pack comprises a box body, single batteries, lifting lugs and a first connecting assembly, wherein the box body comprises a plurality of bearing beams, and the bearing beams are connected and define a containing cavity; the single battery is arranged in the accommodating cavity; the lifting lug is provided with a first through hole, and the first through hole extends along the thickness direction of the bearing beam; the first connecting component at least partially penetrates through the first through hole and the bearing beam so as to connect the lifting lug with the bearing beam in a threaded manner.

Compared with the existing welded connection mode, the battery pack has the advantages that the lifting lug and the bearing beam are connected in a threaded mode through the first connecting component, the operation is convenient, and the production efficiency can be improved on the premise that the structural strength is guaranteed. In addition, the deformation of the box body can not be caused by adopting the connection mode of the screw connection, so that the flatness of the box body after connection is improved, the yield is improved, and the production cost is effectively reduced. The screw connection belongs to a detachable connection type, so that convenience can be provided for later-stage safety maintenance, the repeated use amount of parts is increased, the maintenance cost is reduced, and the production cost is further reduced during mass production.

In one embodiment, the first connecting component comprises a first bolt and a first nut, the first nut is embedded in one side surface of the load beam, and the first bolt extends along the thickness direction of the load beam, penetrates through the first through hole and is in threaded connection with the first nut.

In one embodiment, the load beam is provided with a limiting hole, and the first bolt part is penetrated through the limiting hole and fixedly connected with the load beam.

In one embodiment, the limiting holes, the first through holes, the first nuts and the first bolts are all multiple, wherein the limiting holes are distributed at intervals along the length direction of the load beam, and the first through holes are distributed at intervals on the lifting lugs.

In one embodiment, the lifting lug comprises a first connecting portion and a second connecting portion which are detachably connected, the first through hole is formed in the first connecting portion, and the second connecting portion is used for connecting an external hoisting device.

In one embodiment, the lifting lug further comprises a second connecting assembly, the second connecting assembly comprises a second bolt and a second nut, and the second bolt extends along the length direction of the load beam, penetrates through the first connecting portion and the second connecting portion, and is in threaded connection with the second nut.

In one embodiment, the direction of extension of the first bolt intersects the direction of extension of the second bolt.

In one embodiment, the first connecting portion has a first connecting plate, a second connecting plate and a third connecting plate, the first through hole is formed in the first connecting plate, the second connecting plate and the third connecting plate are arranged at intervals along the length direction of the load beam and are opposite to each other, the first connecting plate is connected to the second connecting plate and one side, close to the load beam, of the third connecting plate, and the second connecting portion is connected between the second connecting plate and the third connecting plate.

In one embodiment, the second connecting plate and the third connecting plate are provided with a second through hole penetrating through the second connecting plate, and the second bolt part penetrates through the second through hole and is in threaded connection with the second nut.

In one embodiment, a plurality of lifting lugs are connected to one bearing beam at intervals, and the lifting lugs are distributed at intervals along the length direction of the bearing beam.

In one embodiment, the ratio between the tensile strength of the first bolt and the second bolt and the self gravity G of the battery pack is greater than 15.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic overall structure of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a connection relationship between a lifting lug and a load beam in an embodiment of the present application;

FIG. 3 is a front view of the present FIG. 2;

fig. 4 is a schematic structural view of a load beam according to an embodiment of the present application;

fig. 5 is a schematic view of the overall structure of a part of the battery pack according to the embodiment of the present application.

Description of the reference numerals

10. A battery pack; 100. a case; 110. a load beam; 111. a limiting hole; 120. a cavity; 300. lifting lugs; 310. a first through hole; 320. a first connection portion; 321. a first connection plate; 322. a second connecting plate; 323. a third connecting plate; 330. a second connecting portion; 400. a first connection assembly; 410. a first bolt; 420. a first nut; 500. a second connection assembly; 510. a second bolt; 520. and a second nut.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

As shown in fig. 1-5, the present application provides a battery pack 10 including a case 100, a unit cell (not shown), a lifting lug 300, and a first connection assembly 400. The box 100 includes a plurality of load beams 110. A plurality of load beams 110 are connected and define a cavity 120. The unit cells are disposed in the accommodating chamber 120. The lifting lug 300 is provided with a first through hole 310. The first through-holes 310 extend in the thickness direction of the load beam 110 (in either direction as indicated by the S arrow in fig. 2). The first connecting assembly 400 is at least partially inserted through the first through hole 310 and the load beam 110 to screw the lifting lug 300 and the load beam 110.

Compared with the existing welded connection mode, the battery pack 10 uses the first connection assembly 400 to connect the lifting lug 300 and the load beam 110 in a screwed manner, so that the operation is convenient, and the production efficiency can be improved on the premise of ensuring the structural strength. In addition, the deformation of the box body 100 can not be caused by adopting the connection mode of the screw connection, so that the flatness of the box body 100 after connection is improved, the yield is improved, and the production cost is effectively reduced. The screw connection belongs to a detachable connection type, so that convenience can be provided for later-stage safety maintenance, the repeated use amount of parts is increased, the maintenance cost is reduced, and the production cost is further reduced during mass production.

It is to be noted that, compare in current welded connected mode, under the prerequisite that satisfies structural strength, panel make full use of bolted connection's convenience in this application, the convenience installer installs, can effectively promote production efficiency.

In addition, since the temperature of the welding position is high during the welding process, the case 100 is deformed by a little careless of an installer, which seriously affects the manufacturing efficiency and the yield of the battery pack 10. The battery pack 10 of the present application can effectively eliminate the adverse effect on the connection portion such as the case 100 due to the installation by using the bolt connection method. In addition, the shape of the lifting lug 300 and the point positions of the bolt connection can be checked according to simulation, and the design scheme is further optimized, so that the mounting efficiency of the battery pack 10 and the connection stability of the battery pack 10 are further improved while the mounting strength is ensured to meet the design requirement.

Further, the user may perform various aging tests and anti-striking tests on the battery pack 10 according to actual needs, and check the states of the respective structural members of the battery pack 10, thereby verifying the safety and reliability of the design.

In one embodiment, as shown in fig. 2-4, the first connection assembly 400 includes a first bolt 410 and a first nut 420. The first nut 420 is embedded in a side surface of the load beam 110. The first bolt 410 extends along the thickness direction of the load beam 110, penetrates through the first through hole 310, and is screwed with the first nut 420.

In this embodiment, the first bolt 410 is any one of two bolts M5 or M6, and the first through hole 310 can be penetrated by the first bolt 410, and the first nut 420 can be screwed with the first bolt 410 and fix the lifting lug 300 and the load beam 110 together with the first bolt 410.

Furthermore, the ratio between the total bearing force F of all bolts in the present application and the self gravity G of the battery pack 10 is greater than 15 (i.e., F/G > 15).

In one embodiment, the load beam 110 is provided with a limiting hole 111. The first bolt 410 is partially inserted into the limiting hole 111 and is fixedly connected with the load beam 110. Accordingly, the first bolt 410 can be screwed with the first nut 420 after passing through the first through hole 310 and the limiting hole 111 in sequence, so as to fix the lifting lug 300 on the load beam 110.

In one embodiment, as shown in fig. 3 and 4, the limiting hole 111, the first through hole 310, the first nut 420, and the first bolt 410 are all plural. The plurality of limiting holes 111 are arranged at intervals along the length direction of the load beam 110 (as indicated by any direction indicated by a T arrow in fig. 3 or fig. 4). The plurality of first through holes 310 are arranged at intervals on the lifting lug 300.

It should be noted that, a plurality of lifting lugs 300 may be connected to one load beam 110 at intervals. The lifting lugs 300 are arranged at intervals along the length direction of the load beam 110.

It should be noted that the number of the limiting holes 111 may be the same as the number of the first through holes 310, or may not be the same as the number of the first through holes 310, which is not limited herein. Specifically, in the present embodiment, the number of the limiting holes 111 is identical to the number of the first through holes 310, and is set in a one-to-one correspondence.

In addition, the user can control the alignment of each first through hole 310 and different limiting holes 111 according to actual needs, so as to adjust the position of each lifting lug 300 on the load beam 110.

In one embodiment, as shown in fig. 5, the lifting lug 300 includes a first connection portion 320 and a second connection portion 330 that are detachably connected. The first connection portion 320 is provided with a first through hole 310. The second connection portion 330 is used for connecting an external hoist.

Specifically, in the present embodiment, the lifting lug 300 further includes a second connection assembly 500. The second connection assembly 500 includes a second bolt 510 and a second nut 520. The second bolt 510 extends along the length direction of the load beam 110, passes through the first connection portion 320 and the second connection portion 330, and is screwed with the second nut 520.

Wherein the length direction of the first bolt 410 intersects the length direction of the second bolt 510.

Specifically, in the present embodiment, the extending direction of the first bolt 410 is perpendicular to the extending direction of the second bolt 510.

In one embodiment, as shown in fig. 2 to 5, the first connection part 320 has a first connection plate 321, a second connection plate 322, and a third connection plate 323. The first through hole 310 is formed in the first connecting plate 321. The second connecting plates 322 and the third connecting plates 323 are spaced apart and arranged opposite to each other along the length direction of the load beam 110. The first connecting plate 321 is connected to the second connecting plate 322 and the third connecting plate 323 at a side close to the load beam 110. The second connection portion 330 is connected between the second connection plate 322 and the third connection plate 323.

Specifically, in the present embodiment, the second connection plate 322 is disposed perpendicular to the first connection plate 321.

In one embodiment, the second connecting plate 322 and the third connecting plate 323 are provided with a second through hole therethrough. The second bolt 510 partially passes through the second through hole and is screw-coupled with the second nut 520.

The ratio between the tensile strength F of the first bolt 410 and the second bolt 510 and the self gravity G of the battery pack 10 is greater than 15.

Specifically, in the present embodiment, the ratio between the tensile strength F of the first bolt 410 and the second bolt 510 and the self gravity G of the battery pack 10 is AB.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The term "parallel" in the present application includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering, for example, "parallel" refers to a state in which straight lines form an angle of-1 ° to 1 ° with respect to straight lines, straight lines form an angle of plane with respect to plane, or plane with respect to plane; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering, for example, vertical "refers to a state in which an angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The distances are equal or the angles are equal, not only the absolute equal condition is included, but also the general equal condition of the conventional cognition in engineering is included, and certain errors can exist, such as a state that the tolerance range is between-1% and 1%.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack (10), characterized by comprising:

the box body (100) comprises a plurality of bearing beams (110), and the bearing beams (110) are connected and define a containing cavity (120);

the single battery is arranged in the accommodating cavity (120);

the lifting lug (300) is provided with a first through hole (310), and the first through hole (310) extends along the thickness direction of the bearing beam (110); the method comprises the steps of,

the first connecting assembly (400) is at least partially arranged through the first through hole (310) and the bearing beam (110) in a penetrating mode so as to enable the lifting lug (300) to be in threaded connection with the bearing beam (110).

2. The battery pack (10) according to claim 1, wherein the first connection assembly (400) includes a first bolt (410) and a first nut (420), the first nut (420) is embedded in one side surface of the load beam (110), and the first bolt (410) extends in a thickness direction of the load beam (110) and penetrates through the first through hole (310) and is screwed with the first nut (420).

3. The battery pack (10) according to claim 2, wherein the load beam (110) is provided with a limiting hole (111), and the first bolt (410) is partially inserted into the limiting hole (111) and is fixedly connected with the load beam (110).

4. The battery pack (10) according to claim 3, wherein the limiting hole (111), the first through hole (310), the first nut (420), and the first bolt (410) are all plural,

the limiting holes (111) are arranged at intervals along the length direction of the bearing beam (110), and the first through holes (310) are arranged at intervals on the lifting lugs (300).

5. The battery pack (10) according to claim 2, wherein the lifting lug (300) comprises a first connecting portion (320) and a second connecting portion (330) which are detachably connected, the first through hole (310) is formed in the first connecting portion (320), and the second connecting portion (330) is used for connecting an external hoisting device.

6. The battery pack (10) of claim 5, wherein the lifting lug (300) further comprises a second connection assembly (500), the second connection assembly (500) comprising a second bolt (510) and a second nut (520), the second bolt (510) extending along a length direction of the load beam (110) and passing through the first connection portion (320) and the second connection portion (330), and being in threaded engagement with the second nut (520).

7. The battery pack (10) of claim 6, wherein the direction of extension of the first bolt (410) intersects the direction of extension of the second bolt (510).

8. The battery pack (10) according to claim 6, wherein the first connection portion (320) has a first connection plate (321), a second connection plate (322) and a third connection plate (323), the first through hole (310) is formed in the first connection plate (321), the second connection plate (322) is spaced apart from the third connection plate (323) in a longitudinal direction of the load beam (110) and is disposed opposite to the second connection plate (322), the first connection plate (321) is connected to one side of the second connection plate (322) and the third connection plate (323) close to the load beam (110), and the second connection portion (330) is connected between the second connection plate (322) and the third connection plate (323).

9. The battery pack (10) according to claim 8, wherein the second connection plate (322) and the third connection plate (323) are provided with a second through hole therethrough, and the second bolt (510) partially penetrates the second through hole and is screwed with the second nut (520).

10. The battery pack (10) according to any one of claims 6-9, wherein a plurality of lifting lugs (300) are connected to one of the load beams (110) at intervals, and the lifting lugs (300) are arranged at intervals along the length direction of the load beam (110); and/or the number of the groups of groups,

the ratio between the tensile strength F of the first bolt (410) and the second bolt (510) and the self gravity G of the battery pack (10) is greater than 15.