Top cover assembly, battery assembly, battery module, battery pack and electric equipment

Abstract

The invention relates to a top cover assembly, a battery assembly, a battery module, a battery pack and electric equipment. The top cover assembly comprises a top cover and a flow guide body, the top cover is provided with a via hole. The current conductor comprises a busbar part, a pole part and a first connecting part which are connected in sequence, the busbar part, the pole and the first connecting part are integrally formed, the busbar part is arranged on the top side of the top cover, the pole part is arranged in the via hole, the first connecting part is arranged on the bottom side of the top cover, and the thickness direction of the first connecting part is consistent with the height direction of the top cover; the first connecting part is used for connecting a tab of a battery cell; the invention aims to improve the charging and discharging efficiency of the battery assembly.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a top cover assembly, battery assembly, battery module, battery pack, and electrical device. Background Technology

[0002] In related technologies, battery modules include busbars, terminals, connectors, and cells. The busbars, terminals, connectors, and the tabs of the cells are connected sequentially. However, the conductors are welded to the terminals, and the terminals are welded to the connectors. This results in high contact resistance between the busbars and the terminals, and between the terminals and the connectors, leading to low charge and discharge efficiency of the battery module. Summary of the Invention

[0003] This application provides a top cover assembly, a battery assembly, a battery module, a battery pack, and an electrical device, aiming to improve the charging and discharging efficiency of the battery assembly.

[0004] To achieve the above objectives, according to a first aspect of this application, a top cover assembly is provided, comprising:

[0005] The top cover has a perforation; and

[0006] The guide includes a busbar, a pole, and a first connecting part connected in sequence. The busbar, the pole, and the first connecting part are integrally formed. The busbar is located on the top side of the top cover, the pole is located in the through hole, and the first connecting part is located 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. The first connecting part is used to connect the tab of the battery cell.

[0007] Optionally, in the width direction of the top cover, the busbar portion extends beyond the top cover, and in the width direction of the top cover, the size of the busbar portion is larger than the size of the top cover.

[0008] Optionally, the busbar includes a second connecting part, a third connecting part, and a fourth connecting part connected in sequence. The second connecting part is connected to the pole part, and in the height direction of the top cover, the bottom side of the fourth connecting part is not lower than the top side of the second connecting part.

[0009] Optionally, in the height direction of the top cover, the distance between the bottom side of the fourth connecting part and the top side of the second connecting part is greater than 0 and less than or equal to 5 mm;

[0010] And / or, in the height direction of the top cover, the third connecting portion is recessed.

[0011] Optionally, a groove is provided on one side of the fourth connecting portion in the height direction of the top cover.

[0012] Optionally, in the height direction of the top cover, the fourth connecting portion is provided with the groove on the side opposite to the top cover.

[0013] Optionally, the distance between the bottom of the groove and the side of the fourth connecting portion near the top cover ranges from 0.5cm to 1.5cm.

[0014] Optionally, the first connecting portion extends along the length direction of the top cover, the busbar portion extends along the width direction of the top cover, the through hole is elongated, and the through hole is inclined in the length direction of the top cover towards the width direction of the top cover.

[0015] Optionally, in the length direction of the top cover, one end of the first connecting part is connected to the pole part, and the other end is provided with a clearance notch. The top side of the top cover is provided with an injection hole. The top cover assembly also includes a sealing pin, which passes through the injection hole and the clearance notch.

[0016] Optionally, the first connection portion includes a busbar portion and two branch portions, the two branch portions are connected to the busbar portion, the clearance notch is provided between the two branch portions, the busbar portion is connected to the terminal portion, and the two branch portions are respectively connected to the tabs of different battery cells.

[0017] Optionally, the inner circumferential surface of the clearance notch is curved.

[0018] According to a second aspect of this application, a battery assembly is provided, comprising:

[0019] The aforementioned top cover assembly;

[0020] A housing, disposed on the top cover, the housing and the top cover enclosing a receiving cavity; and

[0021] A battery cell is disposed in the receiving cavity, and the fluid conductor is connected to the battery cell.

[0022] According to a third aspect of this application, a battery module is provided, including the aforementioned battery assembly.

[0023] According to a fourth aspect of this application, a battery pack is also provided, including the aforementioned battery module.

[0024] According to a fifth aspect of this application, an electrical device is also provided, including the aforementioned battery pack.

[0025] In the top cover assembly of this application embodiment, the busbar portion, the terminal portion, and the first connecting portion are integrally formed. This integrally formed design eliminates the contact resistance problem caused by traditional welding connections, because the entire fluid conductor is a continuous whole, and the current can be smoothly conducted between the busbar portion, the terminal portion, and the first connecting portion, thereby significantly reducing the contact resistance. Lower contact resistance means less energy loss during current conduction. It is understood that the top cover assembly can be used in battery modules, thereby improving the charging and discharging efficiency of the battery module, enabling faster charging and more efficient discharging.

[0026] Furthermore, because the busbar, terminal post, and first connection are integrally molded, the overall structure of the fluid guide is more stable. It better resists the effects of mechanical vibration and temperature changes on the connection points, reducing problems such as poor contact or short circuits caused by loose connections. In addition, the integral design reduces the number of parts and connection points, lowering the risk of errors during assembly and further improving the reliability of the battery assembly.

[0027] In addition, the thickness direction of the first connecting part is set in parallel with the height of the top cover, which makes the spatial layout of the fluid guide and the top cover more compact.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0031] Figure 1 This is a schematic diagram of the overall structure of the electrical equipment provided in an exemplary embodiment of this disclosure.

[0032] Figure 2 yes Figure 1 A schematic diagram of the structure of the battery pack;

[0033] Figure 3 yes Figure 2 A partial structural diagram of the battery module;

[0034] Figure 4 yes Figure 3 Top view of the structure shown;

[0035] Figure 5 yes Figure 2 A partial structural diagram of the battery module;

[0036] Figure 6 yes Figure 5 Top view of the structure shown;

[0037] Figure 7 yes Figure 5 A schematic diagram of the battery assembly in the diagram;

[0038] Figure 8 yes Figure 7 Schematic diagram of the structure of a medium-sized fluid;

[0039] Figure 9 yes Figure 7 Top view of the battery assembly;

[0040] Figure 10 yes Figure 9 Cross-sectional view of the battery assembly;

[0041] Figure 11 yes Figure 10 Enlarged view of point A in the middle;

[0042] Figure 12 yes Figure 11 Schematic diagram of the structure of the first insulating seal;

[0043] Figure 13 yes Figure 11 Schematic diagram of the structure of the first sealing ring;

[0044] Figure 14 yes Figure 11 Schematic diagram of the structure of the second insulating seal;

[0045] Figure 15 yes Figure 7 A partially enlarged cross-sectional view of an example of a battery assembly;

[0046] Figure 16 yes Figure 7 A partially enlarged cross-sectional view of another example of a battery assembly;

[0047] Figure 17 yes Figure 7 Enlarged view of part of the structure of the battery module;

[0048] Figure 18 yes Figure 16 Exploded view of the central sealing nail and adhesive components;

[0049] Figure 19 yes Figure 7 A partially enlarged cross-sectional view of another example of a battery assembly;

[0050] Figure 20 yes Figure 7 A partially enlarged cross-sectional view of another example of a battery assembly.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100. Battery pack; 120. Battery module; 130. Battery cell; 200. Battery assembly; 300. Top cover assembly; 311. Top cover; 312. Through hole; 313. Housing; 314. Receiving cavity; 315. Battery cell; 316. Terminal tab; 400. First insulating seal; 410. First insulating seal portion; 420. Second insulating seal portion; 500. First sealing ring; 600. Second insulating seal; 610. Third insulating seal portion; 620. Fourth insulating seal portion; 700. Fluid guide; 710. Busbar portion; 711. Second connection portion; 712. Third connection portion; 713. Fourth connection portion; 714. Groove; 730 740. First connecting part; 741. Clearance notch; 742. Merging part; 743. Branch part; 751. First guide fluid; 752. Second guide fluid; 800. Electrical equipment; 901. Injection hole; 902. First inner circumferential surface; 903. Stepped surface; 904. Second inner circumferential surface; 905. Outer surface; 906. Inner surface; 907. Vent gap; 908. Vent groove; 909. Sealing component; 910. Adhesive component; 911. Third sealing part; 912. Sealing nail; 913. Fourth sealing part; 914. Glue overflow groove; 915. Protruding structure; 916. Limiting part; 917. Fifth connecting part; 918. Sealing cap. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0054] According to the first aspect of this application, referring to Figures 7 to 10This disclosure provides a top cover assembly 300. The top cover assembly 300 includes a top cover 311 and a fluid guide 700. The top cover 311 has a through hole 312. The fluid guide 700 includes a busbar portion 710, a terminal portion 730, and a first connecting portion 740 connected in sequence. The busbar portion 710, the terminal portion, and the first connecting portion 740 are integrally formed. The busbar portion 710 is located on the top side of the top cover 311, the terminal portion 730 is located in the through hole 312, and the first connecting portion 740 is located on the bottom side of the top cover 311. The thickness direction of the first connecting portion 740 is consistent with the height direction of the top cover 311. The first connecting portion 740 is used to connect the tab 316 of the battery cell 315.

[0055] In addition, it is worth mentioning that, in order to avoid a short circuit between the fluid guide 700 and the top cover 311, the top cover 311 should be insulated from the fluid guide 700.

[0056] Because the busbar 710, terminal post 730, and first connection 740 are integrally formed, this one-piece design eliminates the contact resistance problem caused by traditional welded connections. Since the entire fluid conductor 700 is a continuous unit, current can be smoothly conducted between the busbar 710, terminal post 730, and first connection 740, thus significantly reducing contact resistance. Lower contact resistance means less energy loss during current conduction. Therefore, the top cover assembly 300 can be applied to the battery assembly 200, thereby improving the charging and discharging efficiency of the battery assembly 200, enabling faster charging and more efficient discharging.

[0057] Furthermore, since the busbar 710, terminal post 730, and first connection 740 are integrally molded, the overall structure of the fluid guide 700 is more stable. It better resists the effects of mechanical vibration and temperature changes on the connection points, reducing problems such as poor contact or short circuits caused by loose connections. In addition, the integral design reduces the number of parts and connection points, lowering the risk of errors during assembly and further improving the reliability of the battery assembly 200.

[0058] In addition, the thickness direction of the first connecting part 740 is consistent with the height direction of the top cover 311. This design makes the spatial layout of the fluid guide 700 and the top cover 311 more compact.

[0059] It is worth mentioning that the height direction of the top cover 311 is as follows: Figure 10 As shown in direction E, the width direction of the top cover 311 is as follows: Figure 9 As shown in the F direction, the length direction of the top cover 311 is as follows: Figure 9 As shown in the G direction.

[0060] In some embodiments, the busbar portion 710 extends beyond the top cover 311 in the width direction, and the size of the busbar portion 710 is larger than the size of the top cover 311 in the width direction.

[0061] Thus, the battery module 120 can include multiple battery components 200, which are arranged sequentially and in parallel along the width of the top cover 311. In this way, along the width of the top cover 311, the guide tube 700 of one battery component 200 can be directly connected to the guide tube 700 of the next battery component 200, which helps reduce the number of adapters that electrically connect adjacent battery components 200 and improves the assembly efficiency of the battery module 120.

[0062] In some embodiments, the busbar portion 710 includes a second connecting portion 711, a third connecting portion 712 and a fourth connecting portion 713 connected in sequence. The second connecting portion 711 is connected to the pole portion 730. In the height direction of the top cover 311, the bottom side of the fourth connecting portion 713 is not lower than the top side of the second connecting portion 711.

[0063] In this way, after the multiple battery components 200 of the battery module 120 are arranged sequentially and in parallel in the width direction of the top cover 311, the fourth connection portion 713 of one battery component 200 can be directly located above the second connection portion 711 of the next battery component 200, so that the fourth connection of one battery component 200 can be connected to the second connection portion 711 of the next battery component 200, which is beneficial to improving the assembly efficiency of the battery module 120.

[0064] In some embodiments, the distance between the bottom side of the fourth connecting portion 713 and the top side of the second connecting portion 711 in the height direction of the top cover 311 is greater than 0 and less than or equal to 5 mm.

[0065] Thus, on the one hand, the distance between the bottom side of the fourth connecting portion 713 and the top side of the second connecting portion 711 in the height direction of the top cover 311 will not be too small, which helps to reduce the large stress formed between the fourth connecting portion 713 of one battery assembly 200 and the second connecting portion 711 of the next battery assembly 200 due to manufacturing errors. On the other hand, the distance between the bottom side of the fourth connecting portion 713 and the top side of the second connecting portion 711 in the height direction of the top cover 311 will not be too large, so as to facilitate the connection between the fourth connecting portion 713 and the second connecting portion 711, such as, but not limited to, welding the fourth connecting portion 713 and the second connecting portion 711.

[0066] In one example, the distance between the bottom side of the fourth connecting part 713 and the top side of the second connecting part 711 in the height direction of the top cover 311 is 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0067] In some embodiments, the third connecting portion 712 is recessed in the height direction of the top cover 311.

[0068] Thus, when battery assembly 200 is connected to another battery assembly 200 through the fourth connection 713 of the fluid guide 700, during the use of battery assembly 200, when battery assembly 200 expands, the third connection 712 can gradually straighten to release the stress between battery assembly 200 and battery assembly 200, thereby improving the connection stability of the two connected battery assemblies 200.

[0069] In some embodiments, a groove 714 is provided on one side of the fourth connecting portion 713 in the height direction of the top cover 311. This helps to make the 700 lighter.

[0070] In some embodiments, the groove 714 is used for laser welding.

[0071] The groove 714 makes it easier for the welding laser to pass through the fourth connection portion 713. Thus, a lower power welding equipment can be used when welding the fourth connection portion 713 of one battery assembly 200 to the second connection portion 711 of another battery assembly 200, or when connecting the fourth connection portion 713 of one battery assembly 200 to another battery assembly 200.

[0072] In some embodiments, in the height direction of the top cover 311, the fourth connecting portion 713 is provided with a groove 714 on the side opposite to the top cover 311.

[0073] Thus, the groove 714 provides a clear path for the welding laser, ensuring that the laser can accurately irradiate the welding area, avoiding laser deflection or scattering, thereby improving the accuracy and quality of the welding.

[0074] In addition, the groove 714 provides physical guidance for the welding operation, reduces the skill requirements for operators, makes the welding process easier to control, and improves production efficiency.

[0075] In some embodiments, the distance between the bottom of the groove 714 and the side of the fourth connection 713 near the top cover 311 ranges from 0.5cm to 1.5cm.

[0076] In this way, on the one hand, the distance between the bottom of the groove 714 and the bottom surface of the fourth connecting part 713 is not too small, which helps the fourth connecting part 713 to have a certain structural strength. On the other hand, the distance between the bottom of the groove 714 and the bottom surface of the fourth connecting part 713 is not too large, which is conducive to the welding laser passing through.

[0077] In one example, the distance between the bottom of the groove 714 and the bottom surface of the fourth connecting part 713 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.

[0078] In some embodiments, the first connecting portion 740 extends along the length direction of the top cover 311, the busbar portion 710 extends along the width direction of the top cover 311, the through hole 312 is elongated, and the through hole 312 is inclined in the length direction of the top cover 311 toward the width direction of the top cover 311.

[0079] In this way, the material can be bent once to make the connecting part extend along the length direction of the top cover 311, and the busbar part 710 extend along the width direction of the top cover 311.

[0080] In one example, there are two fluid guides 700 and two vias 312. One fluid guide 700 corresponds to one via 312, and the two vias 312 are arranged in parallel.

[0081] In some embodiments, along the length of the top cover 311, one end of the first connecting portion 740 is connected to the pole portion 730, and the other end is provided with a clearance notch 741. The top side of the top cover 311 is provided with an injection hole 901. The top cover assembly 300 also includes a sealing pin 912, which passes through the injection hole 901 and the clearance notch 741.

[0082] In this way, the flow capacity of the connection part is not too small, and the structure of the connection part and the sealing nail 912 is relatively compact.

[0083] In some embodiments, the first connection portion 740 includes a busbar portion 742 and two branch portions 743, the two branch portions 743 are connected to the busbar portion 742, an avoidance notch 741 is provided between the two branch portions 743, the busbar portion 742 is connected to the terminal portion 730, and the two branch portions 743 are respectively connected to the tabs 316 of different cells 315.

[0084] The two branches 743 of the first connecting part 740 are respectively connected to the tabs 316 of different cells 315, which helps to improve the integration of the fluid guide 700 and simplify the structure of the top cover assembly 300.

[0085] In some embodiments, the inner circumferential surface of the clearance notch 741 is curved.

[0086] This helps to reduce the internal stress in the first connecting part 740.

[0087] Reference Figure 11 and 12In some embodiments, the top cover assembly 300 further includes a first insulating seal 400, which includes a first insulating seal portion 410 and a second insulating seal portion 420. The first insulating seal portion 410 and the second insulating seal portion 420 are integrally formed. The first insulating seal portion 410 is disposed between the busbar portion 710 and the top side of the top cover 311, and the second insulating seal portion 420 is disposed between the hole wall of the through hole 312 and the pole portion 730. The pole portion 730 passes through the first insulating seal portion 410.

[0088] In this way, on the one hand, the occurrence of short circuit between busbar 710 and top cover 311 is reduced, and on the other hand, the leakage of electrolyte from battery assembly 200 from through hole 312 to the outside of top cover 311 is reduced, and foreign objects from the outside of top cover 311 also enter the inside of top cover 311 through through hole 312.

[0089] Thus, the integral molding of the first insulating sealing part 410 and the second insulating sealing part 420 reduces complex process steps such as welding, bonding, or assembly, thereby reducing manufacturing difficulty and cost. At the same time, it reduces quality problems caused by process defects (such as poor bonding or welding).

[0090] In addition, the one-piece molded first insulating seal 400 can be produced directly, reducing subsequent assembly processes, improving production efficiency, and shortening the production cycle.

[0091] In one example, the material of the first insulating seal 400 may be, but is not limited to, plastic. Notably, the top cover 311 is connected to the fluid guide 700 via the first insulating seal 400, which allows for a relatively stable relative position between the top cover 311 and the fluid guide 700. In one example, the materials of the first insulating seal 410 and the second insulating seal 420 may be the same or different.

[0092] However, this design is not limited to this. In some other embodiments, the top cover assembly 300 also includes an upper plastic and a second sealing ring. The upper plastic is disposed between the busbar portion 710 and the top side of the top cover 311, and the second sealing ring is disposed between the hole wall of the through hole 312 and the pole portion 730.

[0093] Reference Figure 11 and 13 In some embodiments, the top cover assembly 300 further includes a first sealing ring 500 disposed between the hole wall of the through hole 312 and the pole portion 730.

[0094] In this way, the leakage of electrolyte from battery assembly 200 through through hole 312 to the outside of top cover 311 is reduced, and foreign objects from the outside of top cover 311 also enter the inside of top cover 311 through through hole 312.

[0095] Reference Figure 11 and 14In some embodiments, the top cover assembly 300 further includes a second insulating seal 600, which includes a third insulating seal portion 610 and a fourth insulating seal portion 620. The third insulating seal portion 610 and the fourth insulating seal portion 620 are integrally formed. The third insulating seal portion 610 is disposed between the first connecting portion 740 and the bottom side of the top cover 311, and the fourth insulating seal portion 620 is disposed between the hole wall of the through hole 312 and the pole post portion 730. The pole post portion 730 passes through the third insulating seal portion 610.

[0096] In this way, on the one hand, the occurrence of short circuit between the first connection part 740 and the top cover 311 is reduced, and on the other hand, the leakage of electrolyte from the battery assembly 200 through the through hole 312 to the outside of the top cover 311 is reduced, and foreign objects from the outside of the top cover 311 also enter the top cover 311 through the through hole 312.

[0097] Thus, the integral molding of the third insulating sealing part 610 and the fourth insulating sealing part 620 reduces complex process steps such as welding, bonding, or assembly, thereby reducing manufacturing difficulty and cost. At the same time, it reduces quality problems caused by process defects (such as poor bonding or welding).

[0098] In addition, the one-piece molded second insulating seal 600 can be manufactured directly, reducing subsequent assembly processes, improving production efficiency, and shortening the production cycle.

[0099] In one example, the material of the second insulating seal 600 may be, but is not limited to, plastic. Notably, the top cover 311 is connected to the fluid guide 700 via the second insulating seal 600, which allows for a relatively stable relative position between the top cover 311 and the fluid guide 700. In one example, the materials of the third insulating seal 610 and the fourth insulating seal 620 may be the same or different.

[0100] However, this design is not limited to this. In some other embodiments, the top cover assembly 300 also includes a lower plastic and a third sealing ring. The third sealing ring is disposed between the hole wall of the through hole 312 and the pole post 730, and the lower plastic is disposed between the first connecting part 740 and the bottom side of the top cover 311.

[0101] In some embodiments, the first insulating seal 400, the second insulating seal 600, and the first sealing ring 500 are integrally formed.

[0102] Reference Figure 10 In some embodiments, the top cover 311 is provided with an injection hole 901. Electrolyte can enter the receiving cavity 314 through the injection hole 901. Accordingly, the top cover assembly 300 may also include a sealing member 909. The sealing member 909 is used to close the injection hole 901. Furthermore, after the electrolyte injection is completed, the injection hole 901 can be sealed by the sealing member 909.

[0103] In some embodiments, the sealing component 909 is bonded to the top cover 311, and the sealing component 909 is also welded to the top cover 311 to seal the injection hole 901.

[0104] That is, in some embodiments, this application provides a top cover assembly 300, including a top cover 311 and a sealing member 909. The top cover 311 is provided with an injection hole 901, and the sealing member 909 is at least partially disposed in the injection hole 901. The sealing member 909 is bonded and fixed to the top cover 311, and the sealing member 909 is also welded and fixed to the top cover 311 to seal the injection hole 901.

[0105] Furthermore, the sealing component 909 can be connected and fixed to the top cover 311 by both adhesive bonding and welding, thereby improving the stability and reliability of the connection between the sealing component 909 and the top cover 311, and thus improving the sealing effect of the sealing component 909 on the injection hole 901.

[0106] Please continue to refer to this. Figure 15 In some embodiments, the sealing member 909 may include a third sealing portion 911 and a fourth sealing portion 913. The fourth sealing portion 913 is located on the side of the third sealing portion 911 away from the battery cell 315. Furthermore, along the axial direction of the injection hole 901, the sealing member 909 and the top cover 311 form at least two seals (i.e., at the third sealing portion 911 and the fourth sealing portion 913) on the injection hole 901, thereby effectively improving the sealing effect of the injection hole 901 through the two seals.

[0107] Therefore, the third sealing part 911 can be bonded to the top cover 311 and the fourth sealing part 913 can be welded to the top cover 311.

[0108] Therefore, in the actual assembly process, the third sealing part 911 can be bonded and fixed to the top cover 311 first, and then the fourth sealing part 913 can be welded and fixed to the top cover 311. It can be understood that, compared with bonding and welding in the same area of ​​the sealing component 909, the embodiments of this application, by welding and bonding in different areas of the sealing component 909 (i.e., the third sealing part 911 and the fourth sealing part 913), can avoid damage to the bonding structure during the welding process, and can also avoid incomplete welding caused by the adhesive used for bonding, thereby improving the stability and reliability of the installation of the sealing component 909, and ultimately improving the reliability of sealing the injection hole 901.

[0109] In some embodiments, the sealing member 909 may include an adhesive member 910, which is bonded to the top cover 311.

[0110] Therefore, at least a portion of the third sealing portion 911 can be formed by the adhesive 910.

[0111] During the assembly process, the adhesive can first be molded into a semi-solid adhesive part 910 using a mold, then the adhesive part 910 can be inserted into the injection hole 901, and finally the adhesive part 910 can be cured so that the adhesive part 910 is completely cured and bonded to the inner wall of the injection hole 901, thereby sealing the injection hole 901.

[0112] The adhesive 910 may include epoxy resin adhesive, heat-sensitive adhesive, etc., and the embodiments of this application do not limit it.

[0113] In some embodiments, the inner wall of the injection hole 901 includes a first inner peripheral surface 902, which surrounds the outer peripheral surface of the third sealing part 911 to be bonded and fixed to the outer peripheral surface of the third sealing part 911.

[0114] Therefore, the first seal of the injection hole 901 can be achieved by the cooperation of the first inner circumferential surface 902 and the outer circumferential surface of the third sealing part 911.

[0115] It should also be noted that, along the circumference of the injection hole 901, all areas of the third sealing part 911 may be bonded and fixed to the first inner circumferential surface 902, or only a portion of the third sealing part 911 may be bonded and fixed to the first inner circumferential surface 902. This embodiment does not limit this.

[0116] When all areas of the third sealing part 911 are bonded and fixed to the first inner circumferential surface 902 along the circumferential direction of the injection hole 901, the connection area between the third sealing part 911 and the inner wall of the injection hole 901 can be increased, thereby improving the stability and reliability of the third sealing part 911 in sealing the injection hole 901.

[0117] In some embodiments, an overflow groove 914 may be provided between the sealing member 909 and the inner wall of the injection hole 901. The overflow groove 914 is located on the side of the third sealing part 911 that is close to or far from the fourth sealing part 913, or in other words, the overflow groove 914 is located on the side of the third sealing part 911 that is close to or far from the cell 315, so that adhesive can overflow from the third sealing part 911 into the overflow groove 914.

[0118] It is understandable that if an overflow groove 914 is not provided between the inner wall of the sealing component 909 and the injection hole 901, the adhesive of the third sealing component 911 may partially overflow to other areas during the process of the third sealing component 911 being installed into the injection hole 901, thereby affecting the installation of other parts.

[0119] For example, during the actual assembly of the sealing component 909, the third sealing part 911 is inserted into the injection hole 901 before the fourth sealing part 913, and the third sealing part 911 is inserted into the injection hole 901 from the end furthest from the fourth sealing part 913. If an overflow groove 914 is not provided between the sealing component 909 and the inner wall of the injection hole 901, during the insertion of the third sealing part 911 into the injection hole 901, some of the adhesive from the third sealing part 911 may overflow to the side of the third sealing part 911 closest to the fourth sealing part 913. This overflowing adhesive could prevent the fourth sealing part 913 from being properly installed.

[0120] Therefore, the overflow groove 914 can be located on the side of the third sealing part 911 near the fourth sealing part 913.

[0121] For example, the inner wall of the injection hole 901 includes a stepped surface 903, which faces away from the battery cell 315.

[0122] Therefore, there is an overflow groove 914 between the stepped surface 903 and the sealing member 909. Furthermore, during the process of inserting the third sealing part 911 into the injection hole 901, some of the adhesive of the third sealing part 911 can overflow along the first inner peripheral surface 902 and / or the surface of the sealing member 909 into the overflow groove 914.

[0123] In some embodiments, the overflow groove 914 may be at least partially formed in the sealing member 909.

[0124] Optionally, the overflow groove 914 can also be provided on the wall of the injection hole 901 (such as the stepped surface 903), and this embodiment does not limit this.

[0125] In some embodiments, the top cover 311 further includes an outer surface 905 facing away from the battery cell 315, and the inner wall of the injection hole 901 further includes a second inner circumferential surface 904 and a stepped surface 903, with the second inner circumferential surface 904 connecting between the outer surface 905 and the stepped surface 903. At least one of the outer surface 905, the second inner circumferential surface 904, and the stepped surface 903 is welded and fixed to the fourth sealing portion 913.

[0126] Therefore, by cooperating with the corresponding outer surface 905, the second inner circumferential surface 904, or the stepped surface 903, the second seal of the injection hole 901 can be achieved.

[0127] It should also be noted that, along the circumference of the injection hole 901, all areas of the fourth sealing part 913 may be welded and fixed to the corresponding outer surface 905, the second inner circumferential surface 904, or the stepped surface 903, or only a portion of the fourth sealing part 913 may be welded and fixed to the corresponding outer surface 905, the second inner circumferential surface 904, or the stepped surface 903. This application embodiment does not limit this.

[0128] When all areas of the fourth sealing part 913 are welded and fixed to the corresponding outer surface 905, second inner circumferential surface 904 or stepped surface 903 along the circumference of the injection hole 901, the connection area between the fourth sealing part 913 and the top cover 311 can be increased, thereby improving the stability and reliability of the fourth sealing part 913 in sealing the injection hole 901.

[0129] In some embodiments, the inner edge of the stepped surface 903 is connected to the side edge of the first inner peripheral surface 902 away from the cell 315.

[0130] In some embodiments, an overflow groove 914 surrounds the outer periphery of the third sealing portion 911, and a fourth sealing portion 913 is welded and fixed to the top cover 311 on the outer periphery of the overflow groove 914.

[0131] For example, the portion of the limiting part 916 located on the outer periphery of the overflow groove 914 (e.g., the peripheral edge of the limiting part 916) can be welded and fixed to the wall of the injection hole 901.

[0132] Understandably, if welding is performed at the overflow groove 914, on the one hand, the adhesive overflowing into the overflow groove 914 may affect the reliability of the welding; on the other hand, the space at the overflow groove 914 may also lead to a false weld between the sealing component 909 and the wall of the injection hole 901. Therefore, in this embodiment, the fourth sealing part 913 is welded and fixed to the top cover 311 on the outer periphery of the overflow groove 914, which can improve the reliability of the welding of the fourth sealing part 913, thereby improving the sealing effect of the sealing component 909 on the injection hole 901.

[0133] Please continue to refer to this. Figure 16 In some embodiments, the third sealing part 911 is at least partially disposed in the injection hole 901, and a venting gap 907 is formed between the third sealing part 911 and the inner peripheral surface of the injection hole 901. The venting gap 907 is used to communicate with the inside of the battery casing 313. The fourth sealing part 913 is located on the side of the third sealing part 911 away from the battery cell 315. The fourth sealing part 913 is sealed to the top cover 311 to seal the injection hole 901 and the venting gap 907.

[0134] That is, in some embodiments, this application also provides a top cover assembly 300, including a top cover 311 and a sealing member 909. The top cover 311 is provided with an injection 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 within the injection hole 901, and a venting gap 907 is formed between the third sealing portion 911 and the inner circumferential surface of the injection hole 901. The venting gap 907 is used to communicate with the interior of the battery casing 313. The fourth sealing portion 913 is located on the side of the third sealing portion 911 away from the battery cell 315, and the fourth sealing portion 913 is sealed to the top cover 311 to seal the injection hole 901 and the venting gap 907.

[0135] Understandably, the sealing component 909 primarily isolates the injection port 901 from the external environment through the fourth sealing part 913, thus the sealing effect of the fourth sealing part 913 is relatively important. However, taking the fourth sealing part 913 as an example of sealing by welding, some pores may remain after welding, leading to a situation where there appears to be leakage at the fourth sealing part 913, i.e., the fourth sealing part 913 may have a false seal. Therefore, when the third sealing part 911 completely seals the injection port 901 (i.e., no vent gap 907 is provided), it is impossible to detect whether the fourth sealing part 913 has a false seal by detecting the gas inside the housing 313 from the injection port 901.

[0136] Based on this, in this embodiment, if gas can be detected in the battery from the fourth sealing part 913, it indicates that the fourth sealing part 913 is not completely sealed, and if gas cannot be detected in the battery from the fourth sealing part 913, it indicates that the second sealing part is completely sealed. Thus, detection can be performed after the fourth sealing part 913 seals the injection hole 901 to ensure the reliability of the seal of the fourth sealing part 913, and ultimately improve the reliability of the sealing component 909 sealing the injection hole 901.

[0137] Furthermore, since the third sealing part 911 and the injection hole 901 form a venting gap 907, the third sealing part 911 can also provide a certain degree of sealing effect for the injection hole 901, such as preventing large foreign objects from passing through the injection hole 901.

[0138] Please refer to this as well. Figure 16 and Figure 17 In some embodiments, the inner wall of the injection hole 901 may be formed with a venting groove 908 to form at least a portion of the venting gap 907.

[0139] For example, the top cover 311 includes an inner surface 906 facing the cell 315. The inner wall of the injection hole 901 includes a first inner circumferential surface 902 connected to the inner surface 906, and a vent groove 908 is at least partially located on the first inner circumferential surface 902 for communication with the interior of the battery housing 313.

[0140] In some embodiments, the width of the venting groove 908 is greater than or equal to 0.1 mm. This ensures that the venting groove 908 has sufficient width to allow enough gas to pass through for detection.

[0141] In some embodiments, the width of the vent groove 908 is less than or equal to 0.3 mm. This reduces the risk of electrolyte leakage within the housing 313 along the vent groove 908.

[0142] For example, the width of the ventilation slot 908 can be 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.24 mm, 0.25 mm, or 0.3 mm, and this application embodiment does not limit it.

[0143] It is understandable that, due to the surface tension of liquids, when the width of the venting groove 908 is less than or equal to 0.3 mm, the electrolyte will have difficulty entering the venting groove 908, thus achieving an excellent sealing and barrier effect on the electrolyte.

[0144] In some embodiments, the cross-section of the venting groove 908 is triangular, trapezoidal, or semi-circular, which makes the venting groove 908 easy to manufacture.

[0145] In some embodiments, there is only one vent groove 908. This avoids the possibility that too many vent grooves 908 could affect the sealing effect at the third sealing part 911.

[0146] Optionally, the number of venting grooves 908 is at least two, and the at least two venting grooves 908 are arranged at intervals along the circumference of the injection hole 901. This facilitates detection from multiple positions along the circumference of the injection hole 901, thereby improving the convenience of detection.

[0147] In some embodiments, the vent groove 908 may be disposed on the first inner circumferential surface 902.

[0148] Please continue to refer to this. Figure 16 and Figure 18 In some embodiments, the sealing member 909 may include a sealing pin 912. The sealing pin 912 is bonded to the top cover 311 by an adhesive member 910.

[0149] For example, the adhesive 910 is at least partially surrounding the outer periphery of the sealing pin 912, and the adhesive 910 is bonded to the inner wall of the injection hole 901 so that the sealing member 909 seals the injection hole 901.

[0150] That is, in some embodiments, this application also provides a top cover assembly 300, including a top cover 311 and a sealing member 909. The top cover 311 is provided with an injection hole 901. The sealing member 909 includes a sealing pin 912 and an adhesive member 910, the adhesive member 910 at least partially surrounding the outer periphery of the sealing pin 912, and the adhesive member 910 is bonded and fixed to the inner wall of the injection hole 901, so that the sealing member 909 seals the injection hole 901.

[0151] Furthermore, the sealing pin 912 can be quickly and easily bonded to the wall of the injection hole 901 using the adhesive component 910. Based on this, compared to using the adhesive component 910 to bond and fix the sealing pin 912 on one side of its end face, this embodiment of the application uses the adhesive component 910 to at least partially surround the outer periphery of the sealing pin 912. This allows for full utilization of more area on the outer periphery of the sealing pin 912 for bonding and fixing, thereby increasing the bonding area between the sealing pin 912 and the wall of the injection hole 901, and thus improving the stability and reliability of the bonded sealing component 909 when sealing the injection hole 901.

[0152] In some embodiments, the outer peripheral surface of the sealing pin 912 is provided with a raised structure 915, and the adhesive 910 covers the raised structure 915. Thus, the raised structure 915 on the peripheral surface of the sealing pin 912 increases the bonding area between the sealing pin 912 and the adhesive 910, thereby allowing the sealing pin 912 to be more stably and reliably bonded and fixed to the injection hole 901, ultimately improving the stability and reliability of the sealing of the injection hole 901.

[0153] In some embodiments, the adhesive element 910 is also at least partially disposed on the side of the sealing pin 912 facing the battery cell 315. This increases the bonding area between the sealing pin 912 and the adhesive element 910, thereby allowing the sealing pin 912 to be more stably and reliably bonded to the injection hole 901, ultimately improving the stability and reliability of the sealing of the injection hole 901.

[0154] In some embodiments, the sealing pin 912 includes a limiting portion 916 and a fifth connecting portion 917. The limiting portion 916 abuts against the stepped surface 903, and the fifth connecting portion 917 protrudes from the limiting portion 916 on the side near the battery cell 315. The adhesive member 910 at least partially surrounds the outer periphery of the fifth connecting portion 917. Furthermore, the limiting portion 916 can control the position of the sealing pin 912 inserted into the injection hole 901, facilitating quick and easy installation of the sealing pin 912 and the adhesive member 910, thereby improving the assembly efficiency of the sealing component 909.

[0155] Correspondingly, the outer peripheral surface of the fifth connecting portion 917 may be provided with a protruding structure 915. For example, the outer peripheral surface of the fifth connecting portion 917 may be provided with a periodic rib to form the protruding structure 915.

[0156] Correspondingly, the adhesive 910 may also cover the end of the fifth connecting part 917 that is away from the limiting part 916.

[0157] For example, the adhesive 910 can be fitted onto the end of the fifth connecting portion 917 that is away from the limiting portion 916.

[0158] In the actual assembly process, a semi-solid adhesive 910 can be applied to the fifth connecting part 917 by dispensing glue. Then, the sealing nail 912 and the adhesive 910 are inserted into the injection hole 901 simultaneously. Finally, the semi-solid adhesive 910 is completely cured so that the sealing nail 912 is bonded and fixed to the hole wall of the injection hole 901 by the adhesive 910.

[0159] Optionally, the sealing pin 912 can be placed in the mold as an insert, thereby forming a semi-solid adhesive 910 on the fifth connecting part 917 through the mold; then, the sealing pin 912 and the adhesive 910 are inserted into the injection hole 901 simultaneously; finally, the semi-solid adhesive 910 is completely cured so that the sealing pin 912 is bonded and fixed to the hole wall of the injection hole 901 through the adhesive 910. This embodiment of the application does not limit this.

[0160] In some embodiments, the limiting part 916 may be formed with an overflow groove 914. Therefore, during the process of inserting the sealing pin 912 and the adhesive 910 into the injection hole 901, the adhesive 910 can easily overflow into the overflow groove 914.

[0161] The glue overflow groove 914 can be an annular groove. For example, the glue overflow groove 914 is provided around the fifth connecting portion 917.

[0162] like Figure 16 As shown, in some embodiments, the top cover assembly 300 may further include a sealing cap 918 that closes the end opening of the injection hole 901 away from the cell 315. Thus, the sealing cap 918 can increase the sealing effect of the injection hole 901 by adding a seal to the sealing member 909.

[0163] It should be noted that the sealing cap 918 closes the end opening of the liquid injection hole 901 away from the cell 315. The sealing cap 918 can be placed on the end face of the liquid injection hole 901 or it can abut against the inner circumferential surface of the liquid injection hole 901. This application embodiment does not limit this.

[0164] It should also be noted that the sealing cap 918 and the sealing nail 912 can be integrally formed or separately formed, and this application embodiment does not limit this.

[0165] For example, please continue to refer to Figure 19 The sealing cap 918 and the limiting part 916 are integrally formed and cover the end face of the injection hole 901.

[0166] Therefore, during the assembly process, the sealing cap 918 and the sealing nail 912 can be assembled simultaneously to improve the assembly efficiency of the sealing component 909.

[0167] In some implementations, such as Figure 16 As shown, the sealing cap 918 and the limiting part 916 are spaced apart and cover the end face of the injection hole 901.

[0168] Furthermore, since there is a gap between the sealing cap 918 and the limiting part 916, in the actual assembly and subsequent use of the battery, even if one of the sealing pin 912 and the sealing cap 918 is not installed properly or is displaced, it is not easy to cause interference or damage to the other. This can improve the reliability of the sealing component 909 and ultimately improve the sealing effect of the injection hole 901.

[0169] In some implementations, please refer to [the documentation / reference]. Figure 20 The sealing cap 918 is engaged and fixed with the limiting part 916.

[0170] Furthermore, the engagement of the sealing cover 918 and the limiting part 916 can improve the stability and reliability of the installation of the sealing cover 918.

[0171] For example, the sealing cover 918 is provided with a slot, and the limiting part 916 is snapped and fixed inside the sealing cover 918.

[0172] In some embodiments, at least one of the limiting part 916 and the sealing cover 918 is welded to the top cover 311. Therefore, welding can improve the reliability and stability of the installation of the corresponding sealing pin 912 and sealing cover 918.

[0173] In some embodiments, the sealing component 909 includes a metal part, which is welded to the top cover 311.

[0174] Therefore, at least part of the fourth sealing part 913 can be formed by a metal part.

[0175] For example, the metal part may include a sealing pin 912, and thus may be a fourth sealing part 913 provided on the sealing pin 912.

[0176] Optionally, the metal component may also include a sealing cap 918. Therefore, the sealing cap 918 may also have a fourth sealing part 913.

[0177] The metal parts can be made of aluminum or any other metal material; this application does not limit this.

[0178] Reference Figures 1 to 10 According to a second aspect of this disclosure, a battery assembly 200 is provided, comprising a housing 313, a battery cell 315, and the aforementioned top cover assembly 300. The battery assembly 200 possesses all the beneficial effects of the aforementioned top cover assembly 300, which will not be repeated here. The housing 313 is disposed on the top cover 311, and the housing 313 and the top cover 311 enclose a receiving cavity 314. The battery cell 315 is disposed in the receiving cavity 314, and a fluid guide 700 is connected to the battery cell 315.

[0179] According to a third aspect of this disclosure, a battery module 120 is provided, which includes the aforementioned battery assembly 200. The battery module 120 possesses all the beneficial effects of the aforementioned battery assembly 200, which will not be elaborated further herein.

[0180] There are many structural forms of the battery assembly 200. In some embodiments, the battery assembly 200 has two guides 700. In the width direction of the top cover 311, the two busbars 710 extend beyond different sides of the top cover 311. In the length direction of the top cover 311, the two guides 700 are arranged at intervals. One of the two guides 700 is configured as the first guide 751 and the other is configured as the second guide 752.

[0181] In some embodiments, the battery module 120 includes a plurality of battery components 200. The plurality of battery components 200 are arranged sequentially in the width direction of the top cover 311. In the extension direction of the first fluid guide 751, the first fluid guide 751 of one battery component 200 is connected to the first fluid guide 751 of the next battery component 200.

[0182] However, this design is not limited to this. In some other embodiments, the battery module 120 includes a plurality of battery components 200 and a plurality of battery cells 130. The battery components 200 include the aforementioned top cover assembly 300, and the battery cells 130 do not include the aforementioned top cover assembly 300. In the width direction of the top cover 311, the battery components 200 and battery cells 130 are arranged alternately. In the extension direction of the first guide fluid 751, the first guide fluid 751 of a battery component 200 is connected to the next battery cell 130. In the extension direction of the second guide fluid 752, the first guide fluid 751 of a battery component 200 is connected to the next battery cell 130.

[0183] It is worth mentioning that, in one example, the battery assembly 200 is a square battery assembly 200, and the battery cell 130 is a square battery cell 130.

[0184] According to a fourth aspect of this disclosure, a battery pack 100 is provided, which includes the aforementioned battery module 120. The battery pack 100 possesses all the beneficial effects of the aforementioned battery module 120, which will not be elaborated further herein.

[0185] According to a fifth aspect of this disclosure, an electrical appliance 800 is provided, which includes the aforementioned battery pack 100. The electrical appliance 800 has all the beneficial effects of the aforementioned battery pack 100, which will not be elaborated further herein.

[0186] Electrical equipment 800 may include means of transportation, such as vehicles, ships, airplanes, etc. Electrical equipment 800 may also include weighing scales, body fat scales, nutrition scales, body composition analyzers, charging devices, mobile terminals, and smart home devices, etc., but this application embodiment does not limit this.

[0187] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0188] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0189] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0190] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A top cover assembly, characterized in that, include: The top cover has a perforation; and The guide includes a busbar, a pole, and a first connecting part connected in sequence. The busbar, the pole, and the first connecting part are integrally formed. The busbar is located on the top side of the top cover, the pole is located in the through hole, and the first connecting part is located 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. The first connecting part is used to connect the tab of the battery cell.

2. The top cover assembly according to claim 1, characterized in that, In the width direction of the top cover, the busbar portion extends beyond the top cover, and in the width direction of the top cover, the size of the busbar portion is larger than the size of the top cover.

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

4. The top cover assembly according to claim 3, characterized in that, In the height direction of the top cover, the distance between the bottom side of the fourth connecting part and the top side of the second connecting part 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, characterized in that, A groove is provided on one side of the fourth connecting part in the height direction of the top cover.

6. The top cover assembly according to claim 5, characterized in that, In the height direction of the top cover, the fourth connecting part is provided with the groove on the side opposite to the top cover.

7. The top cover assembly according to claim 6, characterized in that, The distance between the bottom of the groove and the side of the fourth connecting part near the top cover is in the range of 0.5cm to 1.5cm.

8. The top cover assembly according to claim 1, characterized in that, The first connecting portion extends along the length direction of the top cover, the busbar portion extends along the width direction of the top cover, the through hole is elongated, and the through hole is inclined in the length direction of the top cover towards the width direction of the top cover.

9. The top cover assembly according to claim 1, characterized in that, Along the length of the top cover, one end of the first connecting part is connected to the pole part, and the other end is provided with a clearance notch. An injection hole is opened on the top side of the top cover. The top cover assembly also includes a sealing pin, which passes through the injection hole and the clearance notch.

10. The top cover assembly according to claim 9, characterized in that, The first connection part includes a busbar and two branch parts. The two branch parts are connected to the busbar. The clearance notch is located between the two branch parts. The busbar is connected to the terminal post. The two branch parts are respectively connected to the tabs of different battery cells.

11. The top cover assembly according to claim 10, characterized in that, The inner circumferential surface of the avoidance gap is curved.

12. A battery assembly, characterized in that, include: The top cover assembly as claimed in any one of claims 1 to 11; A housing is disposed on the top cover, and the housing and the top cover together form a receiving cavity; as well as A battery cell is disposed in the receiving cavity, and the fluid conductor is connected to the battery cell.

13. A battery module, characterized in that, Includes the battery assembly as described in claim 12.

14. A battery pack, characterized in that, Includes the battery module as described in claim 13.

15. An electrical appliance, characterized in that, Includes the battery pack as described in claim 14.

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