CN120854849A

CN120854849A - Top cap subassembly, battery pack, battery module, battery pack and consumer

Info

Publication number: CN120854849A
Application number: CN202510960528.1A
Authority: CN
Inventors: 王有生; 覃太平; 李华
Original assignee: Jiangsu Ruidefeng Precision Technology Co ltd
Current assignee: Jiangsu Ruidefeng Precision Technology Co ltd
Priority date: 2025-07-11
Filing date: 2025-07-11
Publication date: 2025-10-28

Abstract

The application relates to a top cover assembly, a battery module, a battery pack and electric equipment. Wherein, the top cap has seted up the via hole. The water conservancy diversion body is including busbar portion, utmost point post portion and the first connecting portion that connect gradually, busbar portion, utmost point post and first connecting portion integrated into one piece, and the top side of top cap is located to busbar portion, and the via hole is located to utmost point post portion, and the bottom side of top cap is located to first connecting portion, and the thickness direction of first connecting portion is unanimous with the direction of height of top cap, and first connecting portion is used for connecting the utmost point ear of electric core. The application aims to improve the charge and discharge efficiency of a battery assembly.

Description

Top cap subassembly, battery pack, battery module, battery pack and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a top cover assembly, a battery module, a battery pack and electric equipment.

Background

In the related art, a battery assembly includes a bus bar, a post, a connection tab, and a battery cell. The busbar, the pole, the connecting sheet and the lugs of the battery cell are sequentially connected. However, the current guider is welded with the pole, and the pole is welded with the connecting piece, so that the contact resistance between the bus bar and the pole is larger, and the contact resistance between the pole and the connecting piece is larger, thereby making the charge and discharge efficiency of the battery assembly lower.

Disclosure of Invention

The embodiment of the application provides a top cover assembly, a battery module, a battery pack and electric equipment, and aims to improve the charge and discharge efficiency of the battery assembly.

In order to achieve the above object, according to a first aspect of the present application, there is provided a head cover assembly comprising:

a top cover provided with a via hole, and

The current carrier comprises a bus bar part, a pole column part and a first connecting part which are sequentially connected, wherein the bus bar part, the pole column and the first connecting part are integrally formed, the bus bar part is arranged on the top side of the top cover, the pole column part is arranged on the through hole, the first connecting part is arranged on the bottom side of the top cover, the thickness direction of the first connecting part is consistent with the height direction of the top cover, and the first connecting part is used for connecting the pole lug of the battery cell.

Optionally, the bus bar portion exceeds the top cover in a width direction of the top cover, and a size of the bus bar portion is larger than a size of the top cover in the width direction of the top cover.

Optionally, the busbar portion includes second connecting portion, third connecting portion and fourth connecting portion that connect gradually, the second connecting portion is connected utmost point post portion in the direction of height of top cap, the bottom side of fourth connecting portion is not less than the top side of second connecting portion.

Optionally, in the height direction of the top cover, a distance between a bottom side of the fourth connection portion and a top side of the second connection portion ranges from greater than 0 to less than or equal to 5mm;

And/or, in the height direction of the top cover, the third connecting part is concavely arranged.

Optionally, in the height direction of the top cover, a groove is formed on one side of the fourth connection portion.

Optionally, in the height direction of the top cover, a side of the fourth connection portion facing away from the top cover is provided with the groove.

Optionally, the distance between the bottom of the groove and the side of the fourth connecting part close to the top cover is in the range of 0.5cm to 1.5cm.

Optionally, the first connection portion extends along the length direction of the top cover, the busbar portion extends along the width direction of the top cover, the via hole is in a strip shape, and the via hole is inclined towards the width direction of the top cover in the length direction of the top cover.

Optionally, in the length direction of top cap, the one end of first connecting portion is connected utmost point post portion, and the other end is equipped with dodges the breach, annotate the liquid hole has been seted up to the top side of top cap, top cap subassembly still includes sealed nail, sealed nail wears to locate annotate the liquid hole, and wear to locate dodge the breach.

Optionally, the first connecting portion includes converging portion and two branch portions, two branch portions connect converging portion, dodge the breach and locate two between the branch portion, converging portion connects utmost point post portion, two branch portions are connected with the utmost point ear of different electric cores respectively.

Optionally, the inner peripheral surface of the avoidance notch is arranged in an arc surface.

According to a second aspect of the present application, there is provided a battery assembly comprising:

the foregoing header assembly;

A shell arranged on the top cover, a containing cavity enclosed by the shell and the top cover, and

And the electric core is arranged in the accommodating cavity, and the flow guide body is connected with the electric core.

According to a third aspect of the present application, there is provided a battery module including the foregoing battery assembly.

According to a fourth aspect of the present application, there is also provided a battery pack including the aforementioned battery module.

According to a fifth aspect of the present application, there is also provided a powered device, including the aforementioned battery pack.

In the top cover assembly of the embodiment of the application, the busbar portion, the pole portion and the first connecting portion are integrally formed. The integrally formed design eliminates the contact resistance problem associated with conventional welded connections because the entire current conductor is a continuous unit and current can be smoothly conducted between the busbar portion, the post portion and the first connection portion, thereby significantly reducing contact resistance. A lower contact resistance means less energy loss during the conduction of current, and it is understood that the top cap assembly can be applied to a battery assembly, and thus the charge and discharge efficiency of the battery assembly is improved, and faster charge and more efficient discharge can be achieved.

In addition, because busbar portion, utmost point post portion and first connecting portion are integrated into one piece, the structure of whole conductor is more stable. The device can better resist the influence of mechanical vibration and temperature change on the connection part, and reduces the problems of poor contact or short circuit and the like caused by loose connection. In addition, the integrated into one piece's design has reduced spare part's quantity and tie point, has reduced the risk of error in the equipment process, has further improved battery pack's reliability.

In addition, the thickness direction of the first connecting part is parallel to the height of the top cover, and the design makes the space layout of the current carrier and the top cover more compact.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

Fig. 1 is a schematic diagram of an overall structure of a powered device provided in an exemplary embodiment of the present disclosure.

Fig. 2 is a schematic view of the structure of the battery pack of fig. 1;

Fig. 3 is a partial schematic structure of the battery module of fig. 2;

FIG. 4 is a top view of the structure shown in FIG. 3;

Fig. 5 is a partial schematic structure of the battery module of fig. 2;

FIG. 6 is a top view of the structure shown in FIG. 5;

Fig. 7 is a schematic view of the structure of the battery assembly of fig. 5;

FIG. 8 is a schematic view of the flow conductor of FIG. 7;

FIG. 9 is a top view of the battery assembly of FIG. 7;

fig. 10 is a cross-sectional view of the battery assembly of fig. 9;

fig. 11 is an enlarged view at a in fig. 10;

FIG. 12 is a schematic view of the first insulating seal of FIG. 11;

FIG. 13 is a schematic view of the first seal ring of FIG. 11;

FIG. 14 is a schematic view of the structure of the second insulating seal of FIG. 11;

Fig. 15 is a partial enlarged view of a cross-sectional view of an example of the battery assembly of fig. 7;

fig. 16 is a partial enlarged view of a cross-sectional view of another example of the battery assembly of fig. 7;

Fig. 17 is an enlarged view of a part of the structure of the battery assembly of fig. 7;

FIG. 18 is an exploded view of the seal spike and adhesive of FIG. 16;

fig. 19 is a partial enlarged view of a cross-sectional view of still another example of the battery assembly of fig. 7;

fig. 20 is a partial enlarged view of a cross-sectional view of still another example of the battery assembly of fig. 7.

Reference numerals illustrate:

100. A battery pack; 120, a battery module; 130, battery cells; 200, a battery assembly, 300, a top cap assembly, 311, a top cap, 312, a via hole, 313, a shell, 314, a containing cavity, 315, a battery cell, 316, a tab, 400, a first insulating seal, 410, a first insulating seal, 420, a second insulating seal, 500, a first sealing ring, 600, a second insulating seal, 610, a third insulating seal, 620, a fourth insulating seal, 700, a fluid conductor, 710, a busbar portion, 711, a second connecting portion, 712, a third connecting portion, 713, a fourth connecting portion, 714, a groove, 730, a pole portion, 740, a first connecting portion, 741, a relief notch, 742, a busbar portion, 743, a branching portion, 751, a first fluid conductor, 752, a second fluid conductor, 800, an electrical device, 901, a liquid injection hole, a first inner peripheral surface, 903, a step surface, 904, a second inner peripheral surface, 916, an outer surface, 906, an inner surface, 907, a gap, 908, a groove, 909, a sealing member, a sealing part, 910, an adhesive bonding element, a sealing part, a third sealing portion, 912, a sealing part, a sealing portion, a flange, a flexible sealing portion, a flange, a flexible attachment, and a flexible attachment.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments of the present application.

According to a first aspect of the present application, referring to fig. 7 to 10, the present disclosure provides a cap assembly 300. The header assembly 300 includes a header 311 and a baffle 700. Wherein, the top cap 311 is provided with a via hole 312. The current carrier 700 includes a busbar portion 710, a post portion 730 and a first connection portion 740 that are sequentially connected, where the busbar portion 710, the post and the first connection portion 740 are integrally formed, the busbar portion 710 is disposed on the top side of the top cover 311, the post portion 730 is disposed on the via hole 312, the first connection portion 740 is disposed on the bottom side of the top cover 311, the thickness direction of the first connection portion 740 is consistent with the height direction of the top cover 311, and the first connection portion 740 is used for connecting the tab 316 of the battery core 315.

In addition, it should be noted that, in order to avoid the current collector 700 and the top cover 311 from being shorted, the top cover 311 should be insulated from the current collector 700.

Since the bus bar portion 710, the pole portion 730, and the first connection portion 740 are integrally formed. This integrally formed design eliminates the contact resistance problem associated with conventional welded connections because the entire current conductor 700 is a continuous unit and current can be smoothly conducted between the busbar portion 710, the post portion 730 and the first connection portion 740, thereby significantly reducing contact resistance. A lower contact resistance means less energy loss during the conduction of current, and it can be appreciated that the top cap assembly 300 can be applied to the battery assembly 200, and thus the charge and discharge efficiency of the battery assembly 200 can be improved, and faster charge and more efficient discharge can be achieved.

In addition, since the bus bar portion 710, the pole portion 730, and the first connection portion 740 are integrally formed, the structure of the entire current carrier 700 is more stable. The device can better resist the influence of mechanical vibration and temperature change on the connection part, and reduces the problems of poor contact or short circuit and the like caused by loose connection. In addition, the integrally formed design reduces the number of parts and connection points, reduces the risk of errors during assembly, and further improves the reliability of the battery assembly 200.

In addition, the thickness direction of the first connection portion 740 coincides with the height direction of the top cover 311, and this design makes the spatial layout of the flow guide 700 and the top cover 311 more compact.

It is noted that the height direction of the top cover 311 is shown as the E direction in fig. 10, the width direction of the top cover 311 is shown as the F direction in fig. 9, and the length direction of the top cover 311 is shown as the G direction in fig. 9.

In some embodiments, the bus bar portion 710 extends beyond the top cover 311 in the width direction of the top cover 311, and the bus bar portion 710 has a size greater than the size of the top cover 311 in the width direction of the top cover 311.

As such, the battery module 120 may include a plurality of battery packs 200, and the plurality of battery packs 200 are sequentially and parallel arranged in the width direction of the top cap 311. In this way, in the width direction of the top cap 311, the current collector 700 of one battery assembly 200 can be directly connected with the current collector 700 of the next battery assembly 200, which is beneficial to reducing the number of connectors for electrically connecting two adjacent battery assemblies 200 and improving the assembly efficiency of the battery module 120.

In some embodiments, the bus bar portion 710 includes a second connection portion 711, a third connection portion 712, and a fourth connection portion 713 connected in sequence, the second connection portion 711 connecting the pole portion 730, and a bottom side of the fourth connection portion 713 is not lower than a top side of the second connection portion 711 in a height direction of the top cover 311.

In this way, after the plurality of battery assemblies 200 of the battery module 120 are sequentially and parallelly disposed in the width direction of the top cover 311, the fourth connection portion 713 of one battery assembly 200 may be directly located above the second connection portion 711 of the next battery assembly 200, so that the fourth connection of one battery assembly 200 is connected with the second connection portion 711 of the next battery assembly 200, which is beneficial to improving the assembly efficiency of the battery module 120.

In some embodiments, a distance between the bottom side of the fourth connection part 713 and the top side of the second connection part 711 in the height direction of the top cover 311 ranges from greater than 0 and less than or equal to 5mm.

In this way, on the one hand, the distance between the bottom side of the fourth connection part 713 and the top side of the second connection part 711 in the height direction of the top cap 311 is not too small, which is advantageous in reducing the formation of a large stress between the fourth connection part 713 of one battery assembly 200 and the second connection part 711 of the next battery assembly 200 due to manufacturing errors. On the other hand, in the height direction of the top cover 311, the distance between the bottom side of the fourth connection part 713 and the top side of the second connection part 711 is not excessively large so that the fourth connection part 713 and the second connection part 711 are connected, for example, but not limited to, the fourth connection part 713 and the second connection part 711 are welded.

In an example, a distance between the bottom side of the fourth connection part 713 and the top side of the second connection part 711 in the height direction of the top cover 311 is 1mm, 2mm, 3mm, 4mm, or 5mm.

In some embodiments, the third connection portion 712 is concavely disposed in the height direction of the top cover 311.

In this way, when the battery assembly 200 is connected to another battery assembly 200 through the fourth connection portion 713 of the current collector 700, the third connection portion 712 may gradually straighten to release the stress between the battery assembly 200 and the battery assembly 200 when the battery assembly 200 expands during the use of the battery assembly 200, thereby improving the connection stability of the two connected battery assemblies 200.

In some embodiments, a groove 714 is opened at one side of the fourth connection part 713 in the height direction of the top cover 311. Thus, the weight of 700 can be reduced.

In some embodiments, the groove 714 is used for laser welding.

The groove 714 makes it easier for the welding laser to pass through the fourth connection 713. In this way, a welding device having a low power may be used when the fourth connection part 713 of one battery pack 200 is welded to the second connection part 711 of another battery pack 200, or a welding device having a low power may be used when the fourth connection part 713 of one battery pack 200 is connected to another battery pack 200.

In some embodiments, a groove 714 is provided on a side of the fourth connection portion 713 facing away from the top cover 311 in the height direction of the top cover 311.

In this way, the groove 714 provides a clear path for the welding laser, ensures that the laser can precisely irradiate the welding part, and avoids laser deflection or scattering, thereby improving the welding precision and quality.

In addition, the grooves 714 provide physical guidance for the welding operation, reducing the skill requirements for operators, making the welding process easier to control, and improving production efficiency.

In some embodiments, the groove bottom of the groove 714 is spaced from the side of the fourth connection portion 713 near the top cover 311 by a distance ranging from 0.5cm to 1.5cm.

In this way, on the one hand, the distance between the bottom of the groove 714 and the bottom of the fourth connecting portion 713 is not too small, which is advantageous for the fourth connecting portion 713 to have a certain structural strength. On the other hand, the distance between the bottom of the groove 714 and the bottom of the fourth connecting portion 713 is not excessively large, which is advantageous for the welding laser to pass through.

In one example, the groove bottom of the groove 714 may be, but is not limited to, 0.5cm, 0.6cm, 0.7cm, 0.8cm, 0.9cm, 1cm, 1.1cm, 1.2cm, 1.3cm or 1.4cm, 1.5cm from the bottom surface of the fourth connection portion 713.

In some embodiments, the first connection portion 740 extends along the length direction of the top cover 311, the bus bar portion 710 is elongated along the width direction of the top cover 311, and the via 312 is disposed obliquely toward the width direction of the top cover 311 along the length direction of the top cover 311.

In this way, the material may be bent once to extend the connecting portion along the length direction of the top cover 311, so that the bus bar portion 710 extends along the width direction of the top cover 311.

In one example, the first and second sensors are configured to detect a signal. Two current conductors 700 are provided, two through holes 312 are provided, one current conductor 700 is provided corresponding to one through hole 312, and the two through holes 312 are arranged in parallel.

In some embodiments, in the length direction of the top cover 311, one end of the first connection portion 740 is connected to the pole portion 730, the other end is provided with an avoidance gap 741, the top side of the top cover 311 is provided with a liquid injection hole 901, the top cover assembly 300 further includes a sealing nail 912, and the sealing nail 912 is arranged through the liquid injection hole 901 and is arranged through the avoidance gap 741.

Thus, the overcurrent capacity of the connecting part is not too small, and the structure of the connecting part and the sealing nail 912 is compact.

In some embodiments, the first connection portion 740 includes a converging portion 742 and two branch portions 743, the two branch portions 743 are connected to the converging portion 742, the avoidance notch 741 is disposed between the two branch portions 743, the converging portion 742 is connected to the post portion 730, and the two branch portions 743 are respectively connected to the tabs 316 of the different electric cells 315.

The two branch portions 743 of the first connection portion 740 are respectively connected with the tabs 316 of the different electric cores 315, which is beneficial to improving the integration level of the current carrier 700 and simplifying the structure of the top cover assembly 300.

In some embodiments, the inner circumferential surface of the avoidance notch 741 is provided in an arc surface.

In this way, it is advantageous to make the internal stress of the first connection portion 740 smaller.

Referring to fig. 11 and 12, in some embodiments, the header assembly 300 further includes a first insulating seal 400, the first insulating seal 400 including a first insulating seal 410 and a second insulating seal 420, the first insulating seal 410 and the second insulating seal 420 being integrally formed, the first insulating seal 410 being disposed between the bus bar portion 710 and the top side of the header 311, the second insulating seal 420 being disposed between the wall of the via 312 and the post portion 730, the post portion 730 being disposed through the first insulating seal 410.

In this way, on the one hand, the occurrence of short circuit between the bus bar portion 710 and the top cap 311 is reduced, and on the other hand, leakage of the electrolyte of the battery assembly 200 from the via hole 312 to the outside of the top cap 311 is reduced, and foreign matter is reduced from the outside of the top cap 311 to the inside of the top cap 311 through the via hole 312.

Thus, the first insulating sealing unit 410 and the second insulating sealing unit 420 are integrally formed, which reduces complex process steps such as welding, bonding or assembling, and reduces manufacturing difficulty and cost. Meanwhile, quality problems caused by process defects (such as poor adhesion and poor welding) are reduced.

In addition, the integrally formed first insulating seal 400 can be directly manufactured, so that the subsequent assembly process is reduced, the production efficiency is improved, and the production period is shortened.

In an example, the material of the first insulating seal 400 may be, but not limited to, plastic, and it is worth mentioning that the top cover 311 is connected to the flow guiding body 700 through the first insulating seal 400, which enables the relative pose of the top cover 311 and the flow guiding body 700 to be stable. In one example, the first insulating seal 410 and the second insulating seal 420 are the same or different materials.

However, the present design is not limited thereto, and in some other embodiments, the top cover assembly 300 further includes an upper plastic disposed between the bus bar portion 710 and the top side of the top cover 311, and a second sealing ring disposed between the wall of the via 312 and the post portion 730.

Referring to fig. 11 and 13, in some embodiments, the cap assembly 300 further includes a first seal ring 500, the first seal ring 500 being disposed between the wall of the via 312 and the post portion 730.

In this way, leakage of the electrolyte of the battery assembly 200 from the via hole 312 to the outside of the top cap 311 is reduced, and foreign matter is reduced from the outside of the top cap 311 to the inside of the top cap 311 through the via hole 312.

Referring to fig. 11 and 14, in some embodiments, the cap assembly 300 further includes a second insulating seal 600, the second insulating seal 600 includes a third insulating seal 610 and a fourth insulating seal 620, the third insulating seal 610 and the fourth insulating seal 620 are integrally formed, the third insulating seal 610 is disposed between the first connection 740 and the bottom side of the cap 311, the fourth insulating seal 620 is disposed between the wall of the via 312 and the post 730, and the post 730 is disposed through the third insulating seal 610.

In this way, on the one hand, the occurrence of the short circuit between the first connection portion 740 and the top cap 311 is reduced, and on the other hand, the leakage of the electrolyte of the battery assembly 200 from the via hole 312 to the outside of the top cap 311 is reduced, and the foreign matter is prevented from entering the inside of the top cap 311 from the outside of the top cap 311 through the via hole 312.

In this way, the integrated formation of the third insulating seal portion 610 and the fourth insulating seal portion 620 reduces complex process steps such as welding, bonding or assembly, and reduces manufacturing difficulty and cost. Meanwhile, quality problems caused by process defects (such as poor adhesion and poor welding) are reduced.

In addition, the integrally formed second insulating seal 600 can be directly manufactured, so that the subsequent assembly process is reduced, the production efficiency is improved, and the production period is shortened.

In an example, the material of the second insulating seal 600 may be, but not limited to, plastic, and it is worth mentioning that the top cover 311 is connected to the flow guiding body 700 through the second insulating seal 600, which enables the relative pose of the top cover 311 and the flow guiding body 700 to be stable. In an example, the third insulating seal 610 and the fourth insulating seal 620 are the same or different materials.

However, the present design is not limited thereto, and in some other embodiments, the cap assembly 300 further includes a lower plastic and a third sealing ring, wherein the third sealing ring is disposed between the wall of the via 312 and the post portion 730, and the lower plastic is disposed between the first connection portion 740 and the bottom side of the cap 311.

In some embodiments, the first insulating seal 400, the second insulating seal 600, and the first seal ring 500 are integrally formed.

Referring to fig. 10, in some embodiments, the top cap 311 is provided with a fill port 901. Electrolyte can enter the containing cavity 314 through the electrolyte injection hole 901. Accordingly, the cap assembly 300 may further include a sealing member 909. The sealing member 909 is used to close the pour hole 901. Further, after the completion of the injection of the electrolyte, the injection hole 901 may be sealed by a sealing member 909.

In some embodiments, sealing member 909 is adhesively secured to cap 311, and sealing member 909 is also welded to cap 311 to seal pour hole 901.

That is, in some implementations, embodiments of the present application provide a cap assembly 300 that includes a cap 311 and a sealing member 909. The top cover 311 is provided with a liquid filling hole 901, a sealing member 909 is at least partially arranged in the liquid filling hole 901, the sealing member 909 is adhered and fixed with the top cover 311, and the sealing member 909 is also welded and fixed with the top cover 311 to seal the liquid filling hole 901.

Further, the sealing member 909 and the cap 311 can be connected and fixed by both bonding and welding, so that the stability and reliability of the connection of the sealing member 909 and the cap 311 can be improved, and the sealing effect of the sealing member 909 on the pouring hole 901 can be improved.

With continued reference to fig. 15, in some embodiments, the sealing member 909 may include a third sealing portion 911 and a fourth sealing portion 913. The fourth sealing part 913 is located at a side of the third sealing part 911 remote from the battery cell 315. Further, at least two seals (namely, at the third seal portion 911 and the fourth seal portion 913) are formed between the seal member 909 and the top cap 311 in the axial direction of the pour hole 901, so that the seal effect of the pour hole 901 can be effectively improved by the two seals.

Then, the third sealing portion 911 may be bonded to the top cover 311, and the fourth sealing portion 913 may be welded to the top cover 311.

Therefore, in the actual assembly process, the third sealing portion 911 and the top cover 311 may be bonded and fixed, and then the fourth sealing portion 913 and the top cover 311 may be welded and fixed. It can be appreciated that, compared to bonding and welding in the same area of the sealing member 909, the embodiment of the present application can avoid the damage to the bonding structure during the welding process and avoid the welding failure caused by the adhesive for bonding by respectively welding and bonding in different areas of the sealing member 909 (i.e., the third sealing portion 911 and the fourth sealing portion 913), thereby improving the stability and reliability of the installation of the sealing member 909 and finally improving the reliability of sealing the liquid injection hole 901.

In some embodiments, the sealing member 909 may include an adhesive 910, the adhesive 910 and the cap 311 being adhesively secured.

Then, at least part of the third sealing portion 911 may be formed by the adhesive 910.

In the assembly process, the adhesive is molded into the semi-solid adhesive 910 through a mold, the adhesive 910 is then placed into the liquid injection hole 901, and finally the adhesive 910 is cured to completely cure and adhere the adhesive 910 to the inner wall of the liquid injection hole 901, so as to seal the liquid injection hole 901.

The adhesive 910 may include epoxy glue, heat sensitive glue, etc., which is not limited in this embodiment of the present application.

In some embodiments, the inner wall of the liquid injection hole 901 includes a first inner circumferential surface 902, and the first inner circumferential surface 902 surrounds the outer circumferential surface of the third sealing portion 911 and is adhered and fixed to the outer circumferential surface of the third sealing portion 911.

Then, the first portion of the liquid injection hole 901 may be sealed by the cooperation of the first inner peripheral surface 902 and the outer peripheral surface of the third sealing portion 911.

Here, all regions of the third seal portion 911 may be bonded to the first inner peripheral surface 902 along the circumferential direction of the liquid inlet 901, or only a partial region of the third seal portion 911 may be bonded to the first inner peripheral surface 902, which is not limited in the embodiment of the present application.

When all the areas of the third sealing portion 911 are adhesively fixed to the first inner peripheral surface 902 along the circumferential direction of the pouring orifice 901, the connection area of the third sealing portion 911 and the inner wall of the pouring orifice 901 can be increased, thereby improving the stability and reliability of the sealing of the pouring orifice 901 by the third sealing portion 911.

In some embodiments, a glue overflow groove 914 may be provided between the sealing member 909 and the inner wall of the injection port 901. The glue overflow groove 914 is located at a side of the third sealing portion 911 close to or far from the fourth sealing portion 913, or the glue overflow groove 914 is located at a side of the third sealing portion 911 close to or far from the battery cell 315, so that the adhesive overflows from the third sealing portion 911 to the glue overflow groove 914.

It will be appreciated that if the glue overflow groove 914 is not provided between the sealing member 909 and the inner wall of the injection hole 901, during the process of filling the third sealing portion 911 into the injection hole 901, the glue of the third sealing portion 911 may partially overflow to other areas to affect the mounting of other parts.

For example, in the actual assembly of the sealing member 909, the third sealing portion 911 is fitted into the pour hole 901 before the fourth sealing portion 913, and the third sealing portion 911 is inserted into the pour hole 901 from the end remote from the fourth sealing portion 913. If the glue overflow groove 914 is not provided between the sealing member 909 and the inner wall of the injection hole 901, the glue of the third sealing portion 911 may partially overflow to the side of the third sealing portion 911 near the fourth sealing portion 913 during the process of loading the third sealing portion 911 into the injection hole 901, and the overflow glue may cause the fourth sealing portion 913 to be unable to be mounted in place.

Thus, the flash groove 914 may be located at a side of the third sealing part 911 near the fourth sealing part 913.

Illustratively, the inner wall of the fill port 901 includes a stepped surface 903, the stepped surface 903 facing away from the cell 315 of the battery.

Then, a flash 914 is provided between the step surface 903 and the sealing member 909. Further, during the process of mounting the third sealing portion 911 in the injection hole 901, part of the adhesive of the third sealing portion 911 may overflow into the adhesive overflow groove 914 along the surface of the first inner circumferential surface 902 and/or the sealing member 909.

In some embodiments, glue overflow channel 914 may be at least partially formed in sealing member 909.

Optionally, the glue overflow groove 914 may be disposed on a hole wall (e.g. the step surface 903) of the liquid injection hole 901, which is not limited in the embodiment of the present application.

In some embodiments, the top cap 311 further includes an outer surface 905 facing away from the cell 315, and the inner wall of the fill hole 901 further includes a second inner circumferential surface 904 and a step surface 903, the second inner circumferential surface 904 being connected between the outer surface 905 and the step surface 903. At least one of the outer surface 905, the second inner circumferential surface 904, and the step surface 903 is welded to the fourth sealing portion 913.

Then, the fourth sealing portion 913 is engaged with the corresponding outer surface 905, second inner circumferential surface 904, or stepped surface 903, thereby sealing the second portion of the pouring orifice 901.

Here, all regions of the fourth sealing portion 913 may be welded to the corresponding outer surface 905, the second inner circumferential surface 904, or the step surface 903 along the circumferential direction of the liquid inlet 901, or only a partial region of the fourth sealing portion 913 may be welded to the corresponding outer surface 905, second inner circumferential surface 904, or step surface 903.

When all the regions of the fourth sealing portion 913 are welded and fixed to the corresponding outer surface 905, second inner circumferential surface 904, or step surface 903 in the circumferential direction of the pouring orifice 901, the connection area of the fourth sealing portion 913 and the top cap 311 can be increased, thereby improving the stability and reliability of the fourth sealing portion 913 sealing the pouring orifice 901.

In some embodiments, the inner end edge of the step surface 903 is connected to the side end edge of the first inner peripheral surface 902 remote from the cell 315.

In some embodiments, the flash 914 surrounds the outer circumference of the third sealing portion 911, and the fourth sealing portion 913 is welded and fixed to the top cover 311 at the outer circumference of the flash 914.

For example, the portion of the stopper 916 located on the outer peripheral side of the flash 914 (for example, the peripheral edge of the stopper 916) may be welded to the wall of the injection hole 901.

It will be appreciated that if the welding is performed at the glue overflow groove 914, on one hand, the bonding glue overflowed to the glue overflow groove 914 may affect the welding reliability, and on the other hand, the space at the glue overflow groove 914 may also cause a cold joint between the sealing member 909 and the wall of the liquid injection hole 901. Therefore, in the embodiment of the present application, the fourth sealing portion 913 is welded and fixed to the top cap 311 at the outer peripheral side of the flash groove 914, so that the welding reliability of the fourth sealing portion 913 can be improved, and the sealing effect of the sealing member 909 on the liquid filling hole 901 can be further improved.

With continued reference to fig. 16, in some embodiments, the third sealing portion 911 is at least partially disposed in the injection hole 901, a vent gap 907 is formed between the third sealing portion 911 and the inner peripheral surface of the injection hole 901, the vent gap 907 is used for communicating with the inside of the housing 313 of the battery, the fourth sealing portion 913 is located at a side of the third sealing portion 911 away from the battery cell 315, and the fourth sealing portion 913 is in sealing connection with the top cover 311 to seal the injection hole 901 and the vent gap 907.

That is, in some embodiments, embodiments of the present application also provide a cap assembly 300 that includes a cap 311 and a sealing member 909. The top cap 311 is provided with a liquid filling hole 901. The sealing member 909 includes a third sealing portion 911 and a fourth sealing portion 913, the third sealing portion 911 is at least partially disposed in the injection hole 901, a vent gap 907 is formed between the third sealing portion 911 and an inner peripheral surface of the injection hole 901, the vent gap 907 is used for communicating to the inside of the housing 313 of the battery, the fourth sealing portion 913 is located at a side of the third sealing portion 911 away from the battery cell 315, and the fourth sealing portion 913 is in sealing connection with the top cap 311 to seal the injection hole 901 and the vent gap 907.

It will be appreciated that the sealing member 909 mainly separates the pouring orifice 901 from the external environment by the fourth sealing section 913, and thus the sealing effect of the fourth sealing section 913 is relatively important. However, taking the case where the fourth sealing portion 913 is sealed by welding and fixing as an example, the fourth sealing portion 913 may have some voids after welding to cause leakage-like and non-leakage at the fourth sealing portion 913, that is, the fourth sealing portion 913 may have a false sealing phenomenon. Then, when the third sealing portion 911 completely seals the pouring hole 901 (i.e., the vent gap 907 is not provided), it is impossible to detect whether or not the fourth sealing portion 913 has a false seal by detecting the gas inside the housing 313 from the pouring hole 901.

In this regard, in the embodiment of the present application, in addition to the ventilation gap 907 formed between the third sealing portion 911 and the pouring hole 901, if the gas in the battery can be detected from the fourth sealing portion 913 of the battery, it is indicated that the fourth sealing portion 913 is not completely sealed, whereas if the gas in the battery cannot be detected from the fourth sealing portion 913, it is indicated that the second sealing portion is completely sealed, and further, the detection can be performed after the fourth sealing portion 913 seals the pouring hole 901, so that the reliability of the sealing of the fourth sealing portion 913 is ensured, and finally, the reliability of the sealing member 909 to the pouring hole 901 is improved.

Further, since the ventilation gap 907 is formed between the third sealing portion 911 and the filling hole 901, the third sealing portion 911 may also have a sealing effect on the filling hole 901 to a certain extent, such as preventing a large-sized foreign matter from passing through the filling hole 901.

Referring to fig. 16 and 17, in some embodiments, ventilation grooves 908 may be formed on the inner wall of the injection hole 901 to form at least part of ventilation gaps 907.

Illustratively, the top cap 311 includes an inner surface 906 that faces the battery cell 315. The inner wall of the filling hole 901 comprises a first inner circumferential surface 902, which is connected to the inner surface 906, and the venting grooves 908 are at least partially located in the first inner circumferential surface 902 for communication to the inside of the housing 313 of the battery.

In some embodiments, the width of the vent channel 908 is greater than or equal to 0.1 millimeters. Further, the vent channel 908 may be ensured to have a sufficient width for a sufficient amount of gas to pass through for detection.

In some embodiments, the width of the vent channel 908 is less than or equal to 0.3 millimeters. Further, the risk of leakage of electrolyte within the housing 313 along the vent channel 908 may be reduced.

Illustratively, the width of the vent slot 908 may be 0.1mm, 0.12 mm, 0.15 mm, 0.mm, 0.2 mm, 0.24 mm, 0.25 mm, 0.mm, or 0.3mm, as embodiments of the present application are not limited.

It will be appreciated that since the liquid has a surface tension, in the case where the width of the vent groove 908 is less than or equal to 0.3mm, the electrolyte may be difficult to enter into the vent groove 908, thereby providing excellent sealing and blocking effects for the electrolyte.

In some embodiments, the vent channel 908 is triangular, trapezoidal, or semicircular in cross-section, such that the vent channel 908 has the advantage of being easy to process.

In some embodiments, the number of vent slots 908 is one. Thus, it is possible to avoid that the excessive vent grooves 908 affect the sealing effect at the third sealing portion 911.

Optionally, the number of the ventilation slots 908 is at least two, and the at least two ventilation slots 908 are arranged at intervals along the circumferential direction of the liquid injection hole 901. Furthermore, detection is conveniently performed from a plurality of positions on the circumference of the liquid injection hole 901, so that the detection convenience is improved.

In some embodiments, vent grooves 908 may be provided on the first inner circumferential surface 902.

With continued reference to fig. 16 and 18, in some embodiments, the sealing member 909 may include a sealing pin 912. The sealing nail 912 is adhered and fixed to the top cover 311 by the adhesive 910.

For example, the adhesive 910 is at least partially wrapped around the outer peripheral side of the sealing nail 912, and the adhesive 910 is adhesively fixed to the inner wall of the liquid injection hole 901 so that the sealing member 909 seals the liquid injection hole 901.

That is, in some embodiments, embodiments of the present application also provide a cap assembly 300 that includes a cap 311 and a sealing member 909. The top cap 311 is provided with a liquid filling hole 901. The sealing member 909 includes a sealing pin 912 and an adhesive 910, the adhesive 910 being at least partially wrapped around the outer peripheral side of the sealing pin 912, the adhesive 910 being adhesively secured to the inner wall of the liquid injection hole 901 such that the sealing member 909 seals the liquid injection hole 901.

Further, the sealing nail 912 can be adhered to the wall of the pouring hole 901 by the adhesive 910 quickly and easily. On this basis, compared with the case that the adhesive 910 is arranged on one side end surface of the sealing nail 912 to bond and fix the sealing nail 912, the embodiment of the application at least partially surrounds the adhesive 910 on the outer peripheral side of the sealing nail 912, and can fully utilize more areas on the outer peripheral side surface of the sealing nail 912 to bond and fix, thereby improving the bonding area between the sealing nail 912 and the hole wall of the liquid injection hole 901, and improving the stability and reliability of the bonded sealing part 909 when sealing the liquid injection hole 901.

In some embodiments, the outer peripheral side surface of the sealing spike 912 is provided with a raised structure 915 and the adhesive 910 covers the raised structure 915. Therefore, the bonding area between the sealing nail 912 and the bonding piece 910 can be increased through the protruding structures 915 on the peripheral side surface of the sealing nail 912, so that the sealing nail 912 can be bonded and fixed to the liquid injection hole 901 more stably and reliably, and finally the sealing stability and reliability of the liquid injection hole 901 can be improved.

In some embodiments, adhesive 910 is also at least partially disposed on the side of sealing pin 912 facing cell 315 of the battery. Therefore, the bonding area between the sealing nail 912 and the bonding piece 910 can be increased, so that the sealing nail 912 can be bonded and fixed to the liquid injection hole 901 more stably and reliably, and finally the stability and reliability of sealing the liquid injection hole 901 can be improved.

In some embodiments, the sealing nail 912 includes a limiting portion 916 and a fifth connecting portion 917, the limiting portion 916 abuts against the step surface 903, the fifth connecting portion 917 protrudes from a side of the limiting portion 916 near the battery cell 315, and the adhesive member 910 at least partially surrounds an outer peripheral side of the fifth connecting portion 917. Further, the position of the sealing nail 912 inserted into the liquid injection hole 901 can be controlled by the limiting part 916, so that the sealing nail 912 and the adhesive 910 can be conveniently and rapidly installed in place, thereby improving the assembly efficiency of the sealing member 909.

Accordingly, it may be that the outer circumferential side surface of the fifth connection portion 917 is provided with a protrusion structure 915. For example, the outer circumferential side surface of the fifth connection portion 917 is provided with a period of ribs to form a convex structure 915.

Accordingly, the adhesive 910 may further cover an end of the fifth connection portion 917 remote from the limiting portion 916.

For example, the adhesive 910 may be sleeved on an end of the fifth connecting portion 917 away from the limiting portion 916.

Then, in the actual assembly process, the semi-solid state adhesive 910 may be disposed on the fifth connection portion 917 by dispensing, then the sealing nail 912 and the adhesive 910 are simultaneously inserted into the injection hole 901, and finally the semi-solid state adhesive 910 is completely cured so that the sealing nail 912 is adhered and fixed on the wall of the injection hole 901 through the adhesive 910.

Alternatively, the sealing nail 912 may be placed as an insert into a mold, so that the semi-solid adhesive 910 is formed on the fifth connection portion 917 by the mold, then the sealing nail 912 and the adhesive 910 are simultaneously inserted into the injection hole 901, and finally the semi-solid adhesive 910 is completely cured, so that the sealing nail 912 is adhered and fixed on the wall of the injection hole 901 by the adhesive 910, which is not limited in the embodiment of the present application.

In some embodiments, the limiter 916 may be formed with glue overflow grooves 914. Therefore, in the process of inserting the sealing nail 912 and the adhesive 910 into the liquid injection hole 901, the adhesive 910 can be conveniently overflowed into the glue overflow groove 914.

The glue overflow 914 may be an annular groove. For example, the glue overflow groove 914 is disposed around the fifth connection portion 917.

As shown in fig. 16, in some embodiments, the cap assembly 300 may further include a sealing cap 918, the sealing cap 918 closing an end opening of the injection port 901 remote from the battery cell 315. Thus, the sealing effect of the sealing member 909 to the pour hole 901 can be increased by the sealing cap 918 to improve the sealing effect of the pour hole 901.

Here, the sealing cap 918 seals an opening of the injection hole 901 at an end far from the battery 315, and the sealing cap 918 may be covered on an orifice end surface of the injection hole 901, or the sealing cap 918 may abut against an inner peripheral surface of the injection hole 901, which is not limited in the embodiment of the present application.

It should be further noted that the sealing cover 918 and the sealing nail 912 may be integrally formed or may be formed separately, which is not limited in this embodiment of the present application.

For example, referring to fig. 19, the sealing cap 918 is integrally formed with the limiting portion 916 and covers the orifice end surface of the liquid injection hole 901.

Thus, the sealing cap 918 and the sealing nail 912 can be assembled simultaneously during the assembly process to improve the assembly efficiency of the sealing member 909.

In some embodiments, as shown in fig. 16, the sealing cap 918 is spaced apart from the limiting portion 916 and covers the orifice end surface of the liquid injection hole 901.

Furthermore, because a gap exists between the sealing cap 918 and the limiting portion 916, in the actual assembly and the subsequent use process of the battery, that is, one of the sealing nail 912 and the sealing cap 918 is not installed in place or is displaced, interference and damage to the other sealing nail is not easy to occur, so that the reliability of the sealing member 909 can be improved, and finally, the sealing effect of the liquid injection hole 901 is improved.

In some embodiments, referring to fig. 20, the sealing cap 918 is clamped and fixed with the limiting portion 916.

Further, the stability and reliability of the installation of the seal cap 918 can be improved by the engagement between the seal cap 918 and the stopper 916.

Illustratively, the seal cap 918 is provided with a clamping groove, and the limiting portion 916 is clamped and fixed in the seal cap 918.

In some embodiments, at least one of the stopper 916 and the seal cap 918 is welded to the cap 311. Accordingly, the reliability and stability of the installation of the corresponding seal nail 912 and seal cap 918 can be improved by means of the welding fixation.

In some embodiments, the sealing member 909 comprises a metal piece that is welded to the top cap 311.

Then, at least part of the fourth sealing portion 913 may be formed of a metal member.

For example, the metal member may include the sealing nail 912, and thus may be the fourth sealing portion 913 provided with the sealing nail 912.

Optionally, the metal piece may also include a sealing cap 918. Therefore, the fourth seal portion 913 may be provided in the seal cap 918.

The metal member may be made of aluminum or any other metal material, which is not limited in the embodiment of the present application.

Referring to fig. 1 to 10, according to a second aspect of the present disclosure, there is provided a battery assembly 200, the battery assembly 200 including a case 313, a battery cell 315, and the foregoing cap assembly 300. The battery assembly 200 has all the advantages of the top cover assembly 300, and the disclosure is not repeated herein. Wherein, the housing 313 is disposed on the top cover 311, the housing 313 and the top cover 311 enclose a housing cavity 314, the battery cell 315 is disposed in the housing cavity 314, and the fluid director 700 is connected with the battery cell 315.

According to a third aspect of the present disclosure, there is provided a battery module 120, the battery module 120 including the aforementioned battery assembly 200. The battery module 120 has all the beneficial effects of the battery assembly 200 described above, and the disclosure is not repeated here.

There are various structural forms of the battery assembly 200, in some embodiments, two current collectors 700 of the battery assembly 200 are provided, two bus bar portions 710 extend beyond different sides of the top cover 311 in the width direction of the top cover 311, and two current collectors 700 are disposed at intervals in the length direction of the top cover 311, one of the two current collectors 700 is configured as a first current collector 751, and the other is configured as a second current collector 752.

In some embodiments, the battery module 120 includes a plurality of battery modules 200, the plurality of battery modules 200 are disposed in sequence in the width direction of the top cap 311, the first current collector 751 of one battery module 200 is connected with the first current collector 751 of the next battery module 200 in the extending direction of the first current collector 751, and the first current collector 751 of one battery module 200 is connected with the first current collector 751 of the next battery module 200 in the extending direction of the first current collector 751.

However, the present design is not limited thereto, and in some other embodiments, the battery module 120 includes a plurality of battery modules 200 and a plurality of battery cells 130, wherein the battery modules 200 include the aforementioned top cap assembly 300, the battery cells 130 do not include the aforementioned top cap assembly 300, the battery modules 200 and the battery cells 130 are alternately arranged in the width direction of the top cap 311, the first current collector 751 of one battery module 200 is connected with the next battery cell 130 in the extending direction of the first current collector 751, and the first current collector 751 of one battery module 200 is connected with the next battery cell 130 in the extending direction of the second current collector 752.

It should be noted that, in an example, the battery assembly 200 is a prismatic battery assembly 200, and the battery cells 130 are prismatic battery cells 130.

According to a fourth aspect of the present disclosure, there is provided a battery pack 100, the battery pack 100 including the aforementioned battery module 120. The battery pack 100 has all the advantages of the battery module 120, and the disclosure is not repeated here.

According to a fifth aspect of the present disclosure, there is provided a powered device 800, the powered device 800 comprising the aforementioned battery pack 100. The powered device 800 has all the advantages of the battery pack 100 described above, and the disclosure is not repeated here.

Powered device 800 may include a vehicle, such as a vehicle, a ship, an aircraft, and the like. The electric device 800 may also include a body weight scale, a body fat scale, a nutritional scale, a body composition analyzer, a charging device, a mobile terminal, an intelligent home device, and the like, which is not limited in the embodiment of the present application.

In the description of the present application, 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 or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The embodiments, the implementation modes and the related technical features of the application can be mutually combined and replaced under the condition of no conflict.

The foregoing is only a preferred embodiment of the present application, and is not intended to limit the present application in any way, but any simple modification, equivalent variation and modification made to the above embodiment according to the technical matter of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A top cover assembly, comprising:

A top cover having a through hole; and

The current conductor includes a bus portion, a pole portion and a first connecting portion connected in sequence, wherein the bus portion, the pole and the first connecting portion are integrally formed, the bus portion is arranged on the top side of the top cover, the pole portion is arranged on the via hole, the first connecting portion is arranged on the bottom side of the top cover, the thickness direction of the first connecting portion is consistent with the height direction of the top cover, and the first connecting portion is used to connect the pole ear of the battery cell.

2 . The top cover assembly according to claim 1 , wherein the bus bar portion extends beyond the top cover in a width direction of the top cover, and a size of the bus bar portion is larger than a size of the top cover in the width direction of the top cover.

3. The top cover assembly according to claim 2 is characterized in that the busbar portion includes a second connection portion, a third connection portion and a fourth connection portion connected in sequence, the second connection portion is connected to the pole portion, and in the height direction of the top cover, the bottom side of the fourth connection portion is not lower than the top side of the second connection portion.

4. The top cover assembly according to claim 3, wherein in the height direction of the top cover, a distance between the bottom side of the fourth connecting portion and the top side of the second connecting portion is greater than 0 and less than or equal to 5 mm;

And/or, in the height direction of the top cover, the third connecting portion is recessed.

5 . The top cover assembly according to claim 3 , wherein a groove is formed on one side of the fourth connecting portion in a height direction of the top cover.

6 . The top cover assembly according to claim 5 , wherein the groove is provided on a side of the fourth connecting portion facing away from the top cover in the height direction of the top cover.

7 . The top cover assembly according to claim 6 , wherein a distance between the bottom of the groove and a side of the fourth connecting portion close to the top cover ranges from 0.5 cm to 1.5 cm.

8. The top cover assembly according to claim 1 is characterized in that the first connecting portion extends along the length direction of the top cover, the bus portion extends along the width direction of the top cover, the through hole is in the shape of a long strip, and the through hole is inclined in the length direction of the top cover toward the width direction of the top cover.

9. The top cover assembly according to claim 1 is characterized in that, in the length direction of the top cover, one end of the first connecting portion is connected to the pole portion, and the other end is provided with an avoidance gap, and a liquid injection hole is opened on the top side of the top cover. The top cover assembly also includes a sealing nail, which is passed through the liquid injection hole and the avoidance gap.

10. The top cover assembly according to claim 9 is characterized in that the first connecting portion includes a confluence portion and two branch portions, the two branch portions are connected to the confluence portion, the avoidance gap is arranged between the two branch portions, the confluence portion is connected to the pole portion, and the two branch portions are respectively connected to the pole ears of different battery cells.

11. The top cover assembly according to claim 10, wherein the inner circumference of the avoidance gap is arranged in an arc shape.

12. A battery assembly, comprising:

The top cover assembly according to any one of claims 1 to 11;

a shell, disposed on the top cover, wherein the shell and the top cover enclose a receiving cavity; and

The battery core is arranged in the receiving cavity, and the conductive body is connected to the battery core.

13. A battery module, comprising the battery assembly according to claim 12.

14. A battery pack, comprising the battery module according to claim 13.

15. An electrical device, comprising the battery pack according to claim 14.