Battery pack

Abstract

Disclosed in the present application is a battery pack, comprising a housing, a plurality of battery cells, a plurality of press strips, and a plurality of bonding portions arranged corresponding to the press strips, wherein the housing comprises a housing shell and a housing cover which are connected to each other, an accommodating cavity is formed in the housing shell, and the housing cover is fixedly connected to the housing shell and covers and seals the accommodating cavity; the battery cells are placed inside the accommodating cavity; the press strips are arranged between the housing cover and the battery cells; and the bonding portions each comprise a first adhesive and a second adhesive, and the press strips are fixedly connected to the housing cover by means of the first adhesives and are fixedly connected to the plurality of battery cells by means of the second adhesives.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024223109760, filed on September 20, 2024, with the Chinese Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0003] Related battery packs are usually composed of battery cells, pressing strips and box structures to ensure the stability and safety of the battery. Traditional battery packs mainly focus on the arrangement and connection of battery cells in design, while the design of pressing strips and box structures often lacks sufficient optimization. TECHNICAL PROBLEM

[0004] In terms of box structure, the traditional design usually ignores the comprehensive consideration of heat dissipation inside the battery pack and external impact protection, thereby affecting the service life and safety of the battery pack. Therefore, it is of great technical significance and practical application value to improve the pressing strips and box structure of the battery pack and optimize its stability. TECHNICAL SOLUTION

[0005] The present application provides a battery pack, comprising: a box body comprising a box shell and a box cover, the box shell forming an accommodation cavity, the box cover being connected with the box shell and covering the accommodation cavity; a plurality of single batteries arranged inside the accommodation cavity; a plurality of pressing strips arranged between the box cover and the single batteries; and an adhesive part comprising a first adhesive and a second adhesive, the first adhesive being arranged between the box cover and the pressing strips to connect the box cover and the pressing strips, and the second adhesive being arranged between the pressing strips and the single batteries to connect the pressing strips and the single batteries. ADVANTAGEOUS EFFECTS

[0006] The application has the beneficial effects that the battery pack comprises a box body, a plurality of single batteries, a plurality of pressing strips and a plurality of adhesive parts corresponding to the pressing strips. The box body comprises a box shell and a box cover connected with each other, the box shell is formed with a containing cavity, and the box cover is fixedly connected with the box shell and covers the containing cavity. The single batteries are placed inside the containing cavity and fixedly abut against the inner wall of the containing cavity. The plurality of pressing strips are arranged at intervals, the pressing strips are arranged between the box cover and the single batteries, and both ends of the pressing strips are connected with the box shell. The adhesive parts comprise first glue and second glue. The side wall of the pressing strip close to the box cover is adhered with the first glue, and the side wall of the first glue away from the pressing strip is adhered with the box cover; the side wall of the pressing strip close to the single battery is adhered with the second glue, and the side wall of the second glue away from the pressing strip is adhered with the plurality of single batteries at the same time. The pressing strip is fixedly connected with the box cover through the first glue and fixedly connected with the plurality of single batteries through the second glue, so that the box cover, the plurality of pressing strips and the plurality of single batteries form a whole, the connection strength between the parts is enhanced, the displacement of the battery unit caused by vibration, thermal expansion or impact is improved, the overall structural strength and stability of the battery pack are improved, and the utilization rate of the pressing strip is improved. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 is an exploded structural schematic view of the battery pack provided by the application;

[0008] Fig. 2 is a front view of the battery pack provided by the application;

[0009] Fig. 3 is a partial structural schematic view for showing the anti-skid structure provided by the application;

[0010] Fig. 4 is a sectional structural schematic view of B-B in Fig. 2 provided by the application;

[0011] Fig. 5 is a partial enlarged schematic view of the B region in Fig. 6 provided by the application;

[0012] Fig. 6 is a sectional structural schematic view of A-A in Fig. 2 provided by the application;

[0013] Fig. 7 is a partial enlarged schematic view of the A region in Fig. 3 provided by the application.

[0014] Explanation of reference numerals:

[0015] 20, box; 201, box shell; 2011, containing cavity; 2012, mounting space; 202, box cover; 203, reinforcing beam; 30, pressing strip; 301, first glue containing groove; 302, accommodation groove; 303, via hole; 40, adhesive part; 401, first glue; 402, second glue; 50, gap adjusting assembly; 501, bolt; 5011, skirt; 502, threaded sleeve; 5021, threaded part; 50211, anti-skid structure; 50212, threaded structure; 50213, accommodation groove; 5022, limiting part; 60, single battery.

[0016] Embodiments of the present application

[0017] Please refer to FIG. 1 to FIG. 5, FIG. 1 is an exploded structural schematic diagram of a battery pack provided by an embodiment of the present application; FIG. 2 is a front view of the battery pack provided by an embodiment of the present application; FIG. 3 is a partial structural schematic diagram for showing an anti-skid structure provided by an embodiment of the present application; FIG. 4 is a sectional structural schematic diagram of B-B in FIG. 2 provided by an embodiment of the present application; FIG. 5 is a partial enlarged schematic diagram of B area in FIG. 6 provided by an embodiment of the present application.

[0018] An embodiment of the present application provides a battery pack, which comprises a box 20, a plurality of single batteries 60, a plurality of pressing strips 30 and a plurality of adhesive parts 40 corresponding to the pressing strips 30. The box 20 comprises a box shell 201 and a box cover 202 connected to each other, and the box shell 201 and the box cover 202 can be fixed by bolts, rivets, welding, adhesion or other ways. The box shell 201 is formed with a containing cavity 2011, and the box cover 202 is fixedly connected with the box shell 201 and covers the containing cavity 2011. The single batteries 60 are placed inside the containing cavity 2011 and fixedly abut against the inner wall of the containing cavity 2011. The plurality of pressing strips 30 are arranged at intervals, and the pressing strips 30 are arranged between the box cover 202 and the single batteries 60, and both ends of the pressing strips 30 are connected with the box shell 201.

[0019] Specifically, the adhesive part 40 comprises a first glue 401 and a second glue 402, and the material of the first glue 401 can be silicone, butyl glue, epoxy resin, polyurethane glue or polyimide glue, and the material of the second glue 402 can be silicone, butyl glue, epoxy resin, polyurethane glue or polyimide glue. The side wall of the pressing strip 30 close to the box cover 202 is adhered with the first glue 401, and the side wall of the first glue 401 away from the pressing strip 30 is adhered with the box cover 202; the side wall of the pressing strip 30 close to the single battery 60 is adhered with the second glue 402, and the side wall of the second glue 402 away from the pressing strip 30 is adhered with the plurality of single batteries 60.

[0020] In practical applications, during the process of assembling the battery pack, the single battery 60 is first placed inside the accommodating cavity 2011, and then the pressing strip 30 is installed. The pressing strip 30 is fixedly connected with the box cover 202 through the first adhesive 401 and is fixedly connected with the plurality of single batteries 60 through the second adhesive 402, so that the box cover 202, the plurality of pressing strips 30 and the plurality of single batteries 60 form an integral whole, the connection strength between the parts is enhanced, the displacement of the battery cells caused by vibration, thermal expansion or impact is improved, and the overall structural strength and stability of the battery pack are improved, and the utilization rate of the pressing strip 30 is improved.

[0021] Optionally, referring to FIGS. 3 and 5, a first adhesive groove 301 is formed in a side wall of the pressing strip 30 facing the box cover 202, and the first adhesive 401 is arranged in the first adhesive groove 301. Optionally, when the first adhesive groove 301 is formed in the pressing strip 30, a second adhesive groove is formed in a side wall of the pressing strip 30 facing the single battery 60, and the second adhesive 402 is arranged in the second adhesive groove; or only the second adhesive groove is formed in the side wall of the pressing strip 30 facing the single battery 60.

[0022] In practical applications, during the process of forming the first adhesive 401 by gluing the side of the pressing strip 30 facing the box cover 202, the first adhesive groove 301 forms a space between the pressing strip 30 and the box cover 202 for accommodating the un-solidified adhesive, thereby limiting the flow range of the un-solidified adhesive, reducing the risk of overflow of the un-solidified adhesive from the pressing strip 30, and ensuring that the side walls of the first adhesive 401 formed after the adhesive solidifies are in close contact with the inner walls of the first adhesive groove 301 and the box cover 202, respectively, so that the first adhesive 401 is uniformly distributed at a specific position between the pressing strip 30 and the box cover 202 and between the pressing strip 30 and the single battery 60, that is, by reasonable storage and distribution of the adhesive, the stability of the connection between the pressing strip 30 and the box cover 202 is improved. Similarly, when gluing the side of the pressing strip 30 facing the single battery 60, the second adhesive groove can limit the flow range of the un-solidified adhesive, reduce the risk of overflow of the un-solidified adhesive from the pressing strip, and make the side walls of the second adhesive 402 formed after the adhesive solidifies in close contact with the inner walls of the second adhesive groove and the shoulder of the single battery 60, thereby improving the stability of the connection between the pressing strip 30 and the single battery 60.

[0023] Optionally, referring to FIG. 3, the first adhesive groove 301 extends along the length direction of the pressing strip 30, and the first adhesive groove 301 is a continuous through structure. Optionally, when the second adhesive groove is formed in the pressing strip 30, the second adhesive groove extends along the length direction of the pressing strip 30, and the second adhesive groove is a continuous through structure.

[0024] In practical applications, in the process of gluing the side of the pressing strip 30 facing the box cover 202 to form the first glue body 401, since the first glue storage groove 301 is a continuous through structure, the glue flows along the length direction of the first glue storage groove 301 until the first glue storage groove 301 is filled, reducing the situation of glue accumulation at one place and overflow, improving the continuity and uniformity of the first glue body 401 formed by the glue solidification, further enhancing the connection strength between the pressing strip 30 and the box cover 202, and further improving the overall structural strength and stability of the battery pack. Similarly, in the process of gluing the side of the pressing strip 30 facing the single battery 60 to form the second glue body 402, the second glue storage groove can improve the continuity and uniformity of the second glue body formed by the glue solidification, further enhancing the connection strength between the pressing strip 30 and the single battery 60.

[0025] In an embodiment, referring to FIGS. 1 and 2, the box body 20 includes a plurality of reinforcing beams 203 arranged at intervals in the accommodation cavity 2011. Both ends of the reinforcing beam 203 are connected with the box shell 201. The reinforcing beam 203 and the box shell 201 can be fixed by bolts, rivets, welding, adhesion or other ways.

[0026] Specifically, the battery pack further includes a gap adjusting assembly 50 connected with the pressing strip 30 and the reinforcing beam 203, respectively. The gap adjusting assembly 50 is used to adjust the distance between the pressing strip 30 and the single battery 60.

[0027] In practical applications, when the box shell 201 is impacted by external force, the reinforcing beam 203 enables the force to be transmitted and decomposed in multiple directions, thereby reducing the stress concentration of the box shell 201 due to uneven stress, causing local deformation or damage, and further improving the overall strength of the box shell 201. When the single battery 60 with different dimensions is produced, the gap adjusting assembly 50 enables the pressing strip 30 to adjust the position according to the size of the single battery 60, thereby changing the distance between the pressing strip 30 and the single battery 60 and adjusting the thickness of the second glue body 402. This design meets the fixing needs of single batteries 60 of different sizes, improving the versatility and flexibility of the battery pack.

[0028] In an embodiment, referring to FIGS. 2, 6 and 7, the gap adjusting assembly 50 is provided in plurality along the length direction of the pressing strip 30, and the gap adjusting assembly 50 comprises a bolt 501 and a threaded sleeve 502, the threaded sleeve 502 comprises a threaded portion 5021 and a limiting portion 5022 fixedly connected coaxially, the threaded portion 5021 is embedded on the reinforcing beam 203, the main body shape of the threaded portion 5021 can be a cylindrical shell, and the main body shape of the threaded portion 5021 can also be a multi-prism shell. The limiting portion 5022 protrudes from the box shell 201 and is arranged between the pressing strip 30 and the reinforcing beam 203, the main body shape of the limiting portion 5022 can be a circular ring, and the main body shape of the limiting portion 5022 can also be a polygonal shape. The bolt 501 is threaded through the pressing strip 30 and is threadedly connected with the threaded portion 5021.

[0029] In actual application, when assembling the battery pack, first, the plurality of single batteries 60 are placed in the accommodating cavity 2011, then the pressing strip 30 corresponding to the threaded sleeve 502 is placed on the box shell 201, and then the bolt 501 is threaded through the pressing strip 30 and threadedly matched with the threaded portion 5021 of the threaded sleeve 502, until the side wall of the pressing strip 30 close to the single battery 60 abuts against the limiting portion 5022, at this time, the spacing between the pressing strip 30 and the single battery 60 is the thickness of the limiting portion 5022 minus the height of the single battery 60 protruding from the threaded portion 5021, that is, the spacing between the pressing strip 30 and the single battery 60 can be adjusted by replacing the limiting portion 5022 with different thickness, and the bolt 501 and the threaded portion 5021 are matched to realize accurate control of the spacing between the pressing strip 30 and the single battery 60, which is convenient for assembly. After the plurality of pressing strips 30 are all installed, the two sides of the pressing strip 30 are glued to form the first glue body 401 and the second glue body 402, and the box cover 202 and the box shell 201 are connected, so that the side wall of the pressing strip 30 close to the box cover 202 is fixedly connected with the box cover 202 through the first glue body 401, and the side wall of the pressing strip 30 close to the single battery 60 is fixedly connected with the plurality of single batteries 60 through the second glue body 402.

[0030] In an embodiment, referring to FIG. 7, the threaded portion 5021 is provided with a avoiding groove 50213 at one end close to the pressing strip 30, and is provided with a threaded structure 50212 matched with the bolt 501 at one end away from the pressing strip 30, and the groove wall of the avoiding groove 50213 is arranged in spaced apart manner with the bolt 501.

[0031] In actual application, the bolt 501 is connected with the threaded part 5021 through the threaded structure 50212. In the subsequent gluing process, the glue may flow or overflow into the connection area of the threaded structure 50212 and the bolt 501, causing the threaded part 5021 and the bolt 501 to be bonded and solidified, which makes the pressing strip 30 unable to be smoothly detached from the box shell 201, thereby affecting the subsequent maintenance or replacement of the single battery 60. To avoid such situations, the design of the avoidance groove 50213 can effectively store part of the glue when it overflows, thereby reducing the possibility of the glue entering the connection area of the threaded structure 50212 and the bolt 501. Through reasonable configuration of the avoidance groove 50213, the risk of the threaded part 5021 and the bolt 501 being unable to be detached due to the bonding of the glue can be significantly reduced, ensuring the convenience and reliability of the operation of the battery pack during maintenance or replacement.

[0032] In an embodiment, referring to FIGS. 3 and 7, the outer peripheral wall of the threaded part 5021 is provided with an anti-skid structure 50211, which is a plurality of protrusions arranged around the threaded part 5021 at intervals. The protrusions can be strip-shaped and arranged along the axis direction of the threaded part 5021. The anti-skid structure 50211 is embedded in the reinforcing beam 203 and fixedly connected with the reinforcing beam 203.

[0033] In actual application, when the bolt 501 and the threaded part 5021 are matched, the bolt 501 may continue to rotate after being matched in place. At this time, there may be a risk that the bolt 501 drives the sleeve 502 to rotate relative to the reinforcing beam 203 through the threaded part 5021, causing the sleeve 502 to fail. By providing the anti-skid structure 50211 on the outer peripheral wall of the threaded part 5021, since the anti-skid structure 50211 is protruding and embedded in the reinforcing beam 203, when the sleeve 502 has a tendency to rotate, the anti-skid structure 50211 stops the sleeve 502, making it difficult for the sleeve 502 to rotate, thereby effectively preventing the sleeve 502 from rotating or loosening during work. This anti-skid design enhances the fixing effect of the sleeve 502, thereby ensuring that the connection between the reinforcing beam 203 and the pressing strip 30 is more firm and reliable, further improving the overall structural strength and stability of the battery pack, and ensuring the safety and durability of the battery pack during long-term use.

[0034] In an embodiment, referring to FIGS. 3 and 7, the side wall of the pressing strip 30 away from the single battery 60 is provided with a plurality of accommodation grooves 302, which are arranged one by one with the sleeves 502. When the bolt 501 is threadedly matched with the threaded part 5021, the end of the bolt 501 away from the threaded part 5021 is located inside the accommodation groove 302.

[0035] In actual application, after the bolt 501 and the sleeve 502 are matched in place, the end of the bolt 501 away from the threaded part 5021 is entirely located inside the accommodation groove 302, effectively avoiding direct friction or interference between the bolt 501 and the cover 202, and at the same time making the structure of the battery pack more compact. Through this design optimization, the space occupation of the battery pack is reduced, the rationality and compactness of the overall layout are improved, and it is helpful to realize more efficient component arrangement and installation in limited space.

[0036] In an embodiment, referring to FIG. 7, the pressing strip 30 is provided with a through hole 303, the through hole 303 is in communication with the accommodation groove 302, the bolt 501 passes through the through hole 303, and the circumferential wall of the bolt 501 is fixedly connected with a skirt 5011, the skirt 5011 is circular ring-shaped, the diameter of the skirt 5011 is greater than the head of the bolt 501 and covers the through hole 303, and when the bolt 501 and the sleeve 502 are matched in place, the skirt 5022 seals the through hole 303.

[0037] In actual application, when gluing, the glue may flow or overflow into the through hole 303, at this time, since the diameter of the skirt 5011 is greater than the head of the bolt 501 and covers the through hole 303, the glue is blocked by the skirt 5011 and is not easy to enter the connection area between the threaded part 5021 and the bolt 501 through the through hole 303, thereby reducing the accumulation of glue between the threads and avoiding the problem of difficult disassembly due to the adhesion of the threads by the glue. This structural design reduces the risk of not being able to smoothly disassemble the bolt 501 during maintenance or replacement, and improves the convenience and reliability of the battery pack in subsequent operations.

[0038] In an embodiment, referring to FIG. 1, the plurality of reinforcing beams 203 are arranged parallel to each other, the plurality of reinforcing beams 203 divide the accommodation cavity 2011 into a plurality of parallel arranged mounting spaces 2012, the plurality of mounting spaces 2012 are arranged perpendicular to the connecting line direction of the plurality of reinforcing beams 203, the pressing strip 30 and the reinforcing beam 203 are arranged perpendicular to each other, the middle part of the pressing strip 30 is connected by the cooperation of the bolt 501 and the sleeve 502 with the reinforcing beam 203, and the two ends of the pressing strip 30 are respectively connected by the cooperation of the bolt 501 and the sleeve 502 with the two reinforcing beams 203 with the largest spacing.

[0039] In actual application, when placing the single battery 60 into the mounting space 2012, compared with the rectangular array arranged mounting space 2012, the parallel arranged mounting space 2012 reduces the disassembly times of the mounting space 2012, thereby increasing the volume of the single mounting space 2012, so that the battery module can include a larger number of single batteries 60, thereby effectively saving the boxing time of the single battery 60 and improving the production efficiency.

Claims

1. A battery pack, comprising: a box body comprising a box shell and a box cover, the box shell being formed with a receiving cavity, the box cover being connected to the box shell and covering the receiving cavity; a plurality of single batteries arranged inside the receiving cavity; a plurality of pressing strips arranged between the box cover and the single batteries; and an adhesive part comprising a first adhesive and a second adhesive, the first adhesive being arranged between the box cover and the pressing strips to connect the box cover and the pressing strips, and the second adhesive being arranged between the pressing strips and the single batteries to connect the pressing strips and the single batteries. The box shell and the box cover are connected by one of bolt fastening, rivet fastening, welding, and adhesion. The pressing strip is provided with a first adhesive groove on a side facing the box cover, and the first adhesive is arranged in the first adhesive groove. The pressing strip is provided with a second adhesive groove on a side facing the single battery, and the second adhesive is arranged in the second adhesive groove. The first adhesive groove extends along the length direction of the pressing strip, and the first adhesive groove is a continuous through structure.

2. The battery pack of claim 1, wherein, The second adhesive groove extends along the length direction of the pressing strip, and the second adhesive groove is a continuous through structure.

3. The battery pack of claim 1, wherein, The material of the first adhesive or the second adhesive comprises one of silica gel, butyl rubber, epoxy resin, polyurethane adhesive, and polyimide adhesive.

4. The battery pack of claim 1, wherein, The box body further comprises a plurality of reinforcing beams arranged in the receiving cavity, and the plurality of reinforcing beams are connected to the box shell.

5. The battery pack of claim 3 or 4, wherein, The battery pack further comprises a gap adjusting assembly connected to the pressing strips and the reinforcing beams respectively, and the gap adjusting assembly is used to adjust the distance between the pressing strips and the single batteries.

6. The battery pack of claim 3 or 4, wherein, The reinforcing beams and the box shell are connected by one of bolt fastening, rivet fastening, welding, and adhesion.

7. The battery pack of claim 1, wherein, A plurality of gap adjusting assemblies are arranged at intervals along the length direction of the pressing strips.

8. The battery pack of claim 1, wherein, 11.The battery pack of claim 8, wherein The gap adjusting assembly comprises a bolt and a sleeve, the sleeve is arranged on the reinforcing beam, and the bolt is threadedly connected to the sleeve through the pressing strip.

9. The battery pack of claim 8, wherein, The sleeve comprises a threaded part and a limiting part connected to each other, the threaded part is arranged in the reinforcing beam and threadedly connected to the bolt, and the limiting part is arranged between the pressing strip and the reinforcing beam to adjust the distance between the pressing strip and the single battery.

10. The battery pack of claim 8, wherein, The main body shape of the threaded part is a cylindrical shell, the main body shape of the threaded part is a multi-prism shell, the main body shape of the limiting part is a circular ring, and the main body shape of the limiting part is a polygon. An avoiding groove is arranged at one end of the threaded part close to the pressing strip, and a threaded structure matched with the bolt is arranged at one end of the threaded part away from the pressing strip, and the groove wall of the avoiding groove is arranged at intervals from the bolt. An anti-skid structure is arranged on the outer peripheral wall of the threaded part, and the anti-skid structure is connected to the reinforcing beam. The anti-skid structure is a plurality of protrusions arranged at intervals around the threaded part, and the protrusions are strips arranged along the axis direction of the threaded part.

12. The battery pack of claim 11, wherein, The pressing strip is provided with a clearance groove, and one end of the bolt away from the threaded part is located inside the clearance groove.

13. The battery pack of claim 11, wherein, ​ 14. The battery pack of claim 11, wherein, ​ 15. The battery pack of claim 14, wherein, ​ 16. The battery pack of claim 11, wherein, ​ 17. The battery pack of claim 11, wherein, The pressing strip is provided with a through hole, the bolt passes through the through hole, a skirt is arranged on the peripheral wall of the bolt, and the diameter of the skirt is greater than that of the head of the bolt and covers the through hole.

18. The battery pack of claim 8, wherein, The plurality of reinforcing beams are parallel to each other, and the plurality of reinforcing beams separate the accommodation cavity into a plurality of parallel installation spaces for installing the single batteries.

19. The battery pack of claim 18, wherein, The plurality of installation spaces are arranged perpendicularly to the connection direction of the plurality of reinforcing beams.

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