Helium injection assembly

Abstract

The utility model relates to the technical field of battery helium detection. The utility model provides a helium injection assembly. The helium injection assembly is used for the battery cell. The battery monomer comprises a pole, the pole is provided with at least one matching surface and an injection port, and the injection port is formed in the at least one matching surface. The helium injection assembly comprises a helium injection nozzle and a plurality of sealing faces. The helium injection nozzle is provided with a helium injection channel, and the two ends of the helium injection channel penetrate through the outer wall of the helium injection nozzle in the first direction. The multiple sealing faces are arranged on the helium injection nozzle and located on the periphery of the helium injection channel. Under the condition that the helium injection nozzle is matched with the pole, the multiple sealing faces abut against at least one matching face respectively, the helium injection channel is communicated with the injection opening, and therefore multiple sealing is formed, the compatibility to welding slag is improved, the risk of over-killing caused by the fact that the air tightness between the helium injection nozzle and the pressing face of the pole is damaged due to poor sealing at a time is reduced, and the reliability of the helium injection nozzle is improved. The sealing effectiveness is improved, and the service life of the helium injection nozzle is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery helium detection, in particular to an helium injection assembly. BACKGROUND

[0002] At present, in the helium detection process of the battery, due to the welding spatter existing in the positive pole post welding process, there are many welding dregs on the surface of the liquid injection hole after the welding is completed. When the helium injection nozzle is pressed with the surface of the liquid injection hole, the welding dregs are easy to adhere to the surface of the helium injection nozzle. With the increase of the helium injection times, the surface of the helium injection nozzle is locally uneven due to the accumulation of a large number of welding dregs. When the surface of the helium injection nozzle is pressed with the surface of the liquid injection hole, there is a problem of poor sealing, which is easy to cause overkill and affects the service life of the helium injection nozzle. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the embodiment of the present application provides an helium injection assembly which can be compatible with the influence of welding dregs caused by the external welding of the positive pole of the battery, improve the sealing effectiveness, reduce the wiping frequency of the helium injection nozzle, and improve the production rhythm.

[0004] Therefore, according to the first aspect of the embodiment of the present application, an helium injection assembly is provided for a battery monomer. The battery monomer includes a pole post, the pole post is provided with at least one matching surface and an injection port, the injection port is arranged on the at least one matching surface, and the helium injection assembly includes: an helium injection nozzle, the helium injection nozzle is provided with an helium injection channel, and the two ends of the helium injection channel penetrate through the outer wall of the helium injection nozzle along a first direction; a plurality of sealing surfaces, which are arranged on the helium injection nozzle and located at the outer periphery of the helium injection channel; wherein, in the case that the helium injection nozzle is matched with the pole post, the plurality of sealing surfaces are respectively abutted with the at least one matching surface, and the helium injection channel is communicated with the injection port.

[0005] The helium injection assembly provided by the embodiment of the present application includes the helium injection nozzle and the plurality of sealing surfaces. Specifically, when the helium injection nozzle is matched with the pole post, the plurality of sealing surfaces are respectively abutbed with the at least one matching surface of the pole post, so as to form multiple seals, improve the compatibility with the welding dregs, and even if there is welding dregs on a certain sealing surface, it will not affect the sealing effect of the other sealing surfaces. The risk of damaging the air tightness between the helium injection nozzle and the pressing surface of the pole post due to poor sealing of the helium injection nozzle is reduced, thereby causing overkill. The effectiveness of the sealing is improved, and the service life of the helium injection nozzle is prolonged.

[0006] Since the helium injection nozzle and the pole post form multiple seals, the wiping frequency or replacement frequency of the helium injection nozzle can be effectively reduced, and the production rhythm of the battery monomer can be significantly improved, thereby being beneficial to improving the manufacturing efficiency of the battery monomer and improving the production capacity.

[0007] In some embodiments, the at least one mating surface comprises a first mating surface, and the injection port is arranged on the first mating surface; along the first direction, the plurality of sealing surfaces are arranged on the first side of the helium injection nozzle, and the plurality of sealing surfaces are arranged along a second direction, and in the case that the helium injection nozzle is matched with the pole column, the plurality of sealing surfaces are respectively abutted with the first mating surface, and the second direction intersects the first direction.

[0008] In this embodiment, when the helium injection nozzle is matched with the pole column, the plurality of sealing surfaces are all abutted with the first mating surface to form a multi-surface sealing.

[0009] In some embodiments, the first side of the helium injection nozzle is further provided with a groove, and the groove is located between any two adjacent sealing surfaces.

[0010] That is, the at least two adjacent sealing surfaces are separated by the groove, thereby forming at least two relatively independent sealing surfaces.

[0011] In some embodiments, the groove is configured as an annular groove; and / or the number of the grooves is a plurality, and the plurality of grooves are arranged at intervals along the second direction.

[0012] Since the groove is configured as an annular groove, the mutual interference between any two adjacent sealing surfaces can be avoided.

[0013] Since the number of the grooves is a plurality, a series of labyrinth sealing structures can be formed between the helium injection nozzle and the first mating surface, the number of the sealing surfaces is increased, and the sealing effect between the helium injection nozzle and the first mating surface is improved.

[0014] In some embodiments, along the first direction, the depth of the groove is h, and 1.2mm≤h≤1.65mm.

[0015] By setting the depth of the groove to be between 1.2mm and 1.65mm, when the helium injection nozzle is compressed, the adjacent two sealing surfaces can be effectively separated, the compatibility of the helium injection nozzle to the slag is improved, the overall structural strength of the helium injection nozzle is improved, and the service life of the helium injection nozzle is prolonged.

[0016] In some embodiments, the helium injection nozzle comprises a body and an injection nozzle, along the first direction, the injection nozzle and the plurality of sealing surfaces are arranged on the first side of the body, and the plurality of sealing surfaces are located on the outer periphery of the injection nozzle, and a part of the helium injection channel is arranged in the body and another part is arranged in the injection nozzle; wherein, in the case that the helium injection nozzle is matched with the pole column, the injection nozzle is inserted into the injection port.

[0017] In this embodiment, the positioning of the helium injection nozzle is facilitated, the problem of one-sided sealing deviation between the helium injection nozzle and the first mating surface due to poor centering is solved, and the sealing effect between the helium injection nozzle and the first mating surface is improved.

[0018] In some embodiments, the outer wall of the injection nozzle is in interference fit with the inner wall of the injection port when the injection nozzle is engaged with the pole.

[0019] That is, when the injection nozzle is inserted into the injection port, the outer wall of the injection nozzle is tightly fitted with the inner wall of the injection port, thereby increasing the side seal between the injection nozzle and the pole, improving the positioning accuracy of the injection nozzle, avoiding overkill due to the decrease of the single-sided sealing amount of the injection nozzle, and further improving the sealing effect between the injection nozzle and the pole.

[0020] In some embodiments, the end of the injection nozzle away from the body is provided with a guide wall, at least a part of the guide wall is configured as an outwardly convex arc-shaped wall.

[0021] That is, a chamfer structure is arranged at the insertion end of the injection nozzle, thereby playing a guiding role in the process of inserting the injection nozzle into the injection port, and improving the efficiency of the helium detection process.

[0022] In some embodiments, the end of the injection nozzle close to the body is provided with a matching wall, the matching wall is used to contact the inner wall of the injection port; wherein at least a part of the matching wall is configured as an inwardly concave arc-shaped wall.

[0023] That is, a chamfer structure is arranged at the connection between the injection nozzle and the body, which can reduce the wear generated during the insertion of the injection nozzle into the injection port. Moreover, it can also increase the contact area between the injection nozzle and the inner wall of the injection port, thereby further improving the sealing effect between the injection nozzle and the pole.

[0024] In some embodiments, the width of the body in the second direction gradually increases in the direction away from the injection nozzle.

[0025] In some embodiments, the helium injection channel includes a first channel and a second channel, the first channel is arranged in the body, one end of the first channel penetrates the outer wall of the body, at least a part of the second channel is arranged in the injection nozzle, one end of the second channel communicates with the other end of the first channel, and the other end of the second channel penetrates the outer wall of the injection nozzle; wherein the width of the second channel in the second direction is smaller than the width of the first channel.

[0026] In this embodiment, the width of the second channel arranged inside the injection nozzle in the second direction is set to be small, so that during the helium injection process, helium can enter the inside of the battery cell through the first channel and the second channel in turn, while avoiding the problem that the width of the second channel is too wide, thereby affecting the service life of the injection nozzle.

[0027] In some embodiments, the width of the at least one sealing surface in the second direction is n, wherein n≥0.6mm.

[0028] That is, the width of the single sealing surface in the second direction is greater than or equal to 0.6 mm, so that when the helium injection nozzle is matched with the pole column, the problem of poor sealing between the single sealing surface and the first matching surface due to the small contact area can be avoided, and the sealing effect between the helium injection nozzle and the first matching surface can be further improved.

[0029] In some embodiments, the sealing surface is configured as an annular sealing surface, and the centers of the at least two annular sealing surfaces coincide.

[0030] That is, the at least two annular sealing surfaces are formed as a concentric circular ring structure, which on the one hand facilitates the processing of the sealing surface and the groove, and is conducive to reducing the manufacturing cost of the helium injection nozzle. On the other hand, since the sealing surface is annular, i.e., multi-surface sealing is formed on the outer peripheral side of the injection port, which is conducive to further improving the sealing effect between the helium injection nozzle and the pole column.

[0031] In some embodiments, the side of the helium injection nozzle away from the plurality of sealing surfaces includes a first surface, and the distance between the plurality of sealing surfaces and the first surface in the first direction gradually decreases in a direction away from the helium injection channel; wherein the distance between at least two sealing surfaces in the plurality of sealing surfaces and the first surface in the first direction is different.

[0032] In this embodiment, the distance between the sealing surface located on the outer side and the first surface in the first direction is less than the distance between the sealing surface located on the inner side and the first surface in the first direction, thereby forming a plurality of sealing steps. When the helium injection nozzle is matched with the pole column, the plurality of sealing steps are individually contacted with the first matching surface to achieve sealing, which improves the ability of the helium injection nozzle to be compatible with welding slag and reduces the risk of overkill, thereby improving the production rhythm of the battery cell.

[0033] The at least two sealing steps are individually contacted with the first matching surface to achieve sealing, so that even if one of the sealing steps adheres to the welding slag, the sealing effect between the other sealing steps and the first matching surface is not affected, which can effectively reduce the risk of overkill due to single-point sealing failure.

[0034] In some embodiments, the helium injection assembly further includes a helium injection rod and a plurality of elastic members, the helium injection rod is arranged on the side of the helium injection nozzle away from the plurality of sealing surfaces, the plurality of elastic members are arranged on the helium injection rod and located between the helium injection rod and the helium injection nozzle, and the plurality of elastic members are respectively arranged opposite to the plurality of sealing surfaces in the first direction.

[0035] For example, different elastic forces can be preset for the corresponding elastic members for different sealing steps, and the sealing surfaces do not affect each other, which is conducive to further improving the ability of the helium injection nozzle to be compatible with welding slag.

[0036] In some embodiments, the at least one mating surface comprises a first mating surface and a second mating surface, and the injection port is arranged on the first mating surface; the plurality of sealing surfaces comprises a first sealing surface and a second sealing surface, and the first sealing surface abuts against the first mating surface and the second sealing surface abuts against the second mating surface when the helium injection nozzle is in cooperation with the pole column.

[0037] That is, the pole column is provided with two mating surfaces. When the helium injection is performed, the first sealing surface and one of the mating surfaces abut against each other, and the second sealing surface and the other mating surface abut against each other, thereby forming a multi-surface sealing.

[0038] In some embodiments, the pole column is further provided with a mating groove, a groove bottom wall of the mating groove is formed as the first mating surface, the mating groove is in communication with the injection port when the helium injection nozzle is in cooperation with the pole column, and the second mating surface is located at an outer periphery of the mating groove. The helium injection nozzle comprises a body and an injection nozzle, and the injection nozzle and the second sealing surface are respectively arranged on a first side of the body along a first direction, and the first sealing surface is arranged on a side of the injection nozzle away from the body. A part of the helium injection channel is arranged on the body, and another part is arranged on the injection nozzle. When the helium injection nozzle is in cooperation with the pole column, the injection nozzle is located in the mating groove.

[0039] When the helium injection nozzle is in cooperation with the pole column, the injection nozzle is inserted into the mating groove, the first sealing surface on the injection nozzle abuts against the groove bottom wall of the mating groove, and the second sealing surface on the body abuts against the top end surface of the pole column, thereby forming a multi-surface sealing between the helium injection nozzle and the pole column. Even if the first sealing surface is adhered with welding slag, the sealing effect between the second sealing surface and the pole column is not affected, and the effectiveness of the sealing between the helium injection nozzle and the pole column is maintained.

[0040] In some embodiments, along the first direction, the length of the injection nozzle is greater than the depth of the mating groove when the helium injection nozzle is separated from the pole column.

[0041] That is, in a natural state, the length of the injection nozzle is greater than the depth of the mating groove, so that when the helium injection is performed, the helium injection nozzle is compressed, the first sealing surface can abut against the first mating surface, the second sealing surface can abut against the second mating surface, and a multi-surface sealing is achieved.

[0042] In some embodiments, the inner diameter of the first sealing surface is d1, wherein 0.5mm≤d1≤2mm; and / or the outer diameter of the first sealing surface is d2, wherein 3mm≤d2≤10mm; and / or the outer diameter of the second sealing surface is d3, wherein 10mm≤d3≤25mm.

[0043] Since the inner diameter of the first sealing surface is between 0.5mm and 2mm, and the outer diameter is between 3mm and 10mm, the contact area between the first sealing surface and the first mating surface is set to be relatively large, thereby improving the sealing effect between the first sealing surface and the first mating surface.

[0044] Since the outer diameter of the second sealing surface is between 10 mm and 25 mm, that is, the outer diameter of the second sealing surface is set to be relatively large, the second sealing surface and the top surface (the second matching surface) of the pole column have sufficient contact area, thereby facilitating the improvement of the sealing effect between the second matching surface and the second sealing surface, and further facilitating the improvement of the effectiveness of the multi-surface sealing and the reduction of the risk of helium detection overkill.

[0045] In some embodiments, the pole column is further provided with a matching groove in communication with the injection port, a groove bottom wall of the matching groove is formed as the first matching surface, and a groove side wall of the matching groove is formed as the second matching surface; a bottom wall of the helium injection nozzle is formed as the first sealing surface, and a side wall of the helium injection nozzle is formed as the second sealing surface. In the case where the helium injection nozzle is separated from the pole column, the width of the helium injection nozzle in the second direction is less than the width of the matching groove, and the second direction intersects the first direction.

[0046] Since the groove bottom wall of the matching groove is formed as the first matching surface, and the groove side wall of the matching groove is formed as the second matching surface. That is, when the helium injection nozzle is matched with the pole column, the bottom wall of the helium injection nozzle abuts against the groove bottom wall of the matching groove to form a bottom surface sealing, and the outer side wall of the helium injection nozzle abuts against the groove side wall of the matching groove to form a side surface sealing, thereby forming a multi-surface sealing.

[0047] In some embodiments, in the case where the helium injection nozzle is separated from the pole column, the width of the helium injection nozzle in the second direction is L1; the width of the matching groove is L2, wherein 0.2 mm≤(L2-L1) / 2≤2 mm; and / or in the case where the helium injection nozzle is matched with the pole column, the width of the helium injection nozzle in the second direction is L3, wherein 0.5 mm≤L3-L1≤5 mm.

[0048] Since the single-sided gap between the outer side wall of the helium injection nozzle and the groove side wall of the matching groove is between 0.2 mm and 2 mm when the helium injection nozzle is not compressed. While the helium injection nozzle and the matching groove are smoothly matched, when the helium injection nozzle is compressed, the diameter of the helium injection nozzle can be appropriately increased to form a side surface sealing with the groove side wall of the matching groove, and compatible with the centering problem, thereby facilitating the improvement of the sealing effect between the helium injection nozzle and the pole column.

[0049] Since L3-L1 is between 0.5 mm and 5 mm when the helium injection nozzle is matched with the pole column, that is, when the helium injection nozzle is compressed, the expansion value of the diameter of the helium injection nozzle is between 0.5 mm and 5 mm, and the outer side wall of the helium injection nozzle can abut against the groove side wall of the matching groove when the helium injection nozzle is compressed, thereby forming a side surface sealing.

[0050] In some embodiments, the hardness of the helium injection nozzle is greater than or equal to 25 HA and less than or equal to 75 HA.

[0051] Since the hardness of the helium injection nozzle is between 25HA and 75HA, the sealing effect between the helium injection nozzle and the pole column is improved, the slag compatibility is improved, and the service life of the helium injection nozzle is prolonged.

[0052] In some embodiments, the helium injection nozzle comprises a rubber piece.

[0053] Since the helium injection nozzle is a rubber piece, it can be understood that the rubber piece is a flexible material piece with low hardness. When injecting helium, the helium injection nozzle has a certain compression amount, thereby improving the sealing effect between the helium injection nozzle and the pole column.

[0054] In some embodiments, the rubber piece comprises nitrile rubber, fluororubber, silicone rubber, or ethylene-propylene-diene rubber.

[0055] The rubber piece can be nitrile rubber. Alternatively, the rubber piece can be fluororubber. Alternatively, the rubber piece can be silicone rubber. Alternatively, the rubber piece can be ethylene-propylene-diene rubber. The ethylene-propylene-diene rubber is a synthetic rubber. It can be set according to actual needs.

[0056] The second aspect of the embodiments of the present application provides a helium injection device comprising the helium injection assembly of the first aspect of the embodiments of the present application. Since the helium injection device comprises the helium injection assembly of the first aspect of the embodiments of the present application, it has all the beneficial technical effects of the helium injection assembly, which will not be repeated here.

[0057] The third aspect of the embodiments of the present application provides a battery monomer comprising a shell and a pole column. The shell is provided with a receiving cavity. The pole column is arranged on one side of the shell along a first direction. The pole column is provided with at least one matching surface and an injection port. The injection port is arranged on the at least one matching surface and communicates with the receiving cavity. The battery monomer injects helium into the receiving cavity using the helium injection device of the second aspect of the embodiments of the present application. Since the battery monomer injects helium into the receiving cavity using the helium injection device of the second aspect of the embodiments of the present application, it has all the beneficial technical effects of the helium injection device, which will not be repeated here.

[0058] The fourth aspect of the embodiments of the present application provides a battery comprising the battery monomer of the third aspect of the embodiments of the present application. Since the battery comprises the battery monomer of the third aspect of the embodiments of the present application, it has all the beneficial technical effects of the battery monomer, which will not be repeated here.

[0059] The fifth aspect of the embodiments of the present application provides a power utilization device comprising the battery of the fourth aspect of the embodiments of the present application. Since the power utilization device comprises the battery of the fourth aspect of the embodiments of the present application, it has all the beneficial technical effects of the battery, which will not be repeated here.

[0060] Additional aspects and advantages of the embodiments according to the present application will be described in the following description and part will become apparent to those skilled in the art from the following description or by practice in accordance with the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0061] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the references to the figures, in which:

[0062] Figure 1 A schematic view of a vehicle in some embodiments of the present application;

[0063] Figure 2 A schematic view of a battery cell in some embodiments of the present application;

[0064] Figure 3 A schematic view of a helium injection apparatus in some embodiments of the present application;

[0065] Figure 4 A schematic view of the cooperation between a helium injection nozzle and a pole in a first embodiment of the present application;

[0066] Figure 5 A schematic view of the cooperation between a helium injection nozzle and a pole in a first embodiment of the present application; Figure 4 An enlarged view of the embodiment shown at A;

[0067] Figure 6 A schematic view of the cooperation between a helium injection nozzle and a pole in a first embodiment of the present application;

[0068] Figure 7 A schematic view of the cooperation between a helium injection nozzle and a pole in a first embodiment of the present application;

[0069] Figure 8 A schematic view of the cooperation between a helium injection nozzle and a pole in a first embodiment of the present application;

[0070] Figure 9 A schematic view of a helium injection nozzle in a first embodiment of the present application;

[0071] Figure 10 A schematic view of a helium injection nozzle in a first embodiment of the present application;

[0072] Figure 11 A schematic view of a helium injection nozzle in a first embodiment of the present application;

[0073] Figure 12 A schematic view of a helium injection assembly in a second embodiment of the present application;

[0074] Figure 13 A schematic view of a helium injection nozzle in a third embodiment of the present application;

[0075] Figure 14 Figure 3 is a schematic view of a structure of a helium injection nozzle and a pole in cooperation according to a third embodiment of the present application;

[0076] Figure 15 Figure 4 is a schematic view of a structure of a helium injection nozzle and a pole in cooperation according to a fourth embodiment of the present application;

[0077] Figure 16 Figure 5 is a schematic view of a structure of a helium injection nozzle and a pole in separation according to the fourth embodiment of the present application;

[0078] Figure 17 Figure 6 is a schematic view of a structure of a helium injection nozzle and a pole in cooperation according to the fourth embodiment of the present application;

[0079] wherein, Figures 1 to 17 Corresponding relationship between reference signs and component names in the drawings is as follows:

[0080] 1 helium injection device; 10 helium injection assembly; 12 helium gas containing device; 100 helium injection nozzle; 110 helium injection channel; 112 first channel; 114 second channel; 120 sealing surface; 122 first sealing surface; 124 second sealing surface; 130 groove; 140 body; 150 injection nozzle; 152 guide wall; 154 cooperation wall; 160 first surface; 170 helium injection rod; 180 elastic member;

[0081] 2 vehicle; 20 battery; 30 controller; 40 motor; 200 battery cell; 210 shell; 212 accommodating cavity; 220 pole; 221 cooperation surface; 222 first cooperation surface; 223 second cooperation surface; 224 injection inlet; 225 cooperation groove;

[0082] Z first direction; X second direction. DETAILED DESCRIPTION

[0083] In order to enable a more complete understanding of the above-mentioned objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0084] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other different manners from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0085] At present, with the popularization and promotion of the concept of green development, new energy batteries are more and more widely used in life and industry. Among them, 46 system large cylindrical batteries have the advantages of high energy density, safety, high manufacturing efficiency and good consistency, which can significantly reduce the cost and improve the performance of the battery cell.

[0086] In the related art, during the manufacturing process of the battery monomer, there are welding spatters when the positive pole post is welded with the current collector plate inside the battery monomer, resulting in a large number of welding residues on the pressing surface of the pole post and the helium injection nozzle. Because the helium injection nozzle is in contact with the pressing surface, the surface of the helium injection nozzle is easy to adhere to a large number of welding residues. With the increase of the number of helium injection, a large amount of welding residues will accumulate on the surface of the helium injection nozzle, causing local unevenness. When the helium injection nozzle with a large amount of welding residues is matched with the pole post of the next battery monomer, there is a problem of poor sealing, which affects the helium detection sealing performance and is easy to cause overkill, which needs to be frequently retested, affecting the production rhythm.

[0087] Moreover, because a large amount of welding residues adheres to the surface of the helium injection nozzle, the helium injection nozzle needs to be cleaned frequently or replaced regularly, which is difficult to clean and has a high frequency, reduces the manufacturing efficiency of the battery monomer, and affects the production capacity.

[0088] Based on the above considerations, in order to improve the sealing performance in the helium injection process and improve the production rhythm of the battery monomer, the embodiments of the present application propose a helium injection assembly, wherein the helium injection nozzle is provided with a plurality of sealing surfaces. When the helium injection nozzle is matched with the pole post, the plurality of sealing surfaces are respectively in abutment with at least one matching surface of the pole post to form multiple seals, thereby improving the compatibility of welding residues. Even if there is welding residue on a certain sealing surface, it does not affect the sealing effect of other sealing surfaces. The risk of destroying the air tightness between the helium injection nozzle and the pressing surface of the pole post due to poor sealing is reduced, thereby improving the effectiveness of the seal and prolonging the service life of the helium injection nozzle.

[0089] Moreover, because the helium injection nozzle and the pole post form multiple seals, the wiping frequency or replacement frequency of the helium injection nozzle can be effectively reduced, which can significantly improve the production rhythm of the battery monomer, thereby improving the manufacturing efficiency of the battery monomer and increasing the production capacity.

[0090] The battery monomer disclosed in the embodiments of the present application can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging. The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard.

[0091] The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of the present application are not limited in this regard. The battery monomer is generally divided into three types according to the packaging method: cylindrical battery monomer, square battery monomer and soft pack battery monomer. The embodiments of the present application are not limited in this regard.

[0092] In some embodiments of the present application, the battery can include a plurality of battery monomers, which can be connected in series, in parallel or in a hybrid manner. The hybrid manner means that some of the plurality of battery monomers are connected in series and some are connected in parallel. The plurality of battery monomers can be directly connected in series, in parallel or in a hybrid manner, and the whole formed by the plurality of battery monomers is accommodated in the box of the battery. Of course, the battery can also be in the form of a plurality of battery monomers connected in series, in parallel or in a hybrid manner to form a battery module, and a plurality of battery modules connected in series, in parallel or in a hybrid manner to form a whole and accommodated in the box of the battery. The battery can also include other structures, for example, the battery can also include a busbar component for realizing the electrical connection between the plurality of battery monomers.

[0093] The battery disclosed in the embodiments of the present application can be used in a power consumption device using the battery as a power source, or various energy storage systems using the battery as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0094] Reference Figure 1 , Figure 1 is a schematic view of the structure of the vehicle 2 in some embodiments of the present application. The vehicle 2 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 2 is internally provided with a battery 20, which can be arranged at the bottom, head or tail of the vehicle 2. The battery 20 can be used for power supply of the vehicle 2, for example, the battery 20 can be used as the operating power source of the vehicle 2. The vehicle 2 can also include a controller 30 and a motor 40, and the controller 30 is used to control the battery 20 to supply power to the motor 40, for example, to meet the working power demand of the vehicle 2 during starting, navigation and driving.

[0095] In some embodiments of the present application, the battery 20 can not only be used as the operating power source of the vehicle 2, but also be used as the driving power source of the vehicle 2, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 2.

[0096] Reference Figure 2 , Figure 2A schematic structural view of a battery cell 200 in some embodiments of the present application. The battery cell 200 comprises a shell 210 and a pole 220. The shell 210 is provided with a receiving cavity 212, and the battery cell 200 can further comprise an electrode assembly arranged in the receiving cavity 212. The pole 220 is provided with at least one mating surface 221 and an injection port 224. The injection port 224 is arranged on the at least one mating surface 221, and the injection port 224 is in communication with the receiving cavity 212. Helium is injected into the receiving cavity 212 through the injection port 224.

[0097] Referring to Figure 2 and Figure 3 , Figure 3 A schematic block diagram of a helium injection device 1 in some embodiments of the present application. The helium injection device 1 comprises a helium injection assembly 10 and a helium containing device 12. The helium containing device 12 contains helium therein. The helium containing device 12 is in communication with a helium injection channel 110 of a helium injection nozzle 100. When the helium injection nozzle 100 is matched with the pole 220, the helium in the helium containing device 12 flows into the receiving cavity 212 through the helium injection channel 110 and the injection port 224 in sequence, thereby realizing helium injection. After the helium injection is completed, helium detection is performed by a detection device. If no helium leakage is detected, it indicates that the battery cell 200 is a qualified part. If helium leakage is detected, it indicates that the battery cell 200 is an unqualified part and needs to be retested.

[0098] The helium injection assembly 10 according to the first aspect of the present application will be described below with reference to Figures 4 to 17 . Figure 4 A schematic structural view of the matching of the helium injection nozzle 100 of the first embodiment of the present application with the pole 220. Figure 5 A schematic structural view of the matching of the helium injection nozzle 100 of the first embodiment of the present application with the pole 220. Figure 4 An enlarged view of A in the embodiment shown. Figure 6 A schematic structural view of the matching of the helium injection nozzle 100 of the first embodiment of the present application with the pole 220. Figure 7 A schematic structural view of the matching of the helium injection nozzle 100 of the first embodiment of the present application with the pole 220. Figure 8 A schematic structural view of the matching of the helium injection nozzle 100 of the first embodiment of the present application with the pole 220. Figure 9 A schematic structural view of the helium injection nozzle 100 of the first embodiment of the present application. Figure 10 A schematic structural view of the helium injection nozzle 100 of the first embodiment of the present application. Figure 11 A schematic structural view of the helium injection nozzle 100 of the first embodiment of the present application. Figure 12 A schematic structural view of the helium injection assembly 10 of the second embodiment of the present application. Figure 13 A schematic structural view of the helium injection nozzle 100 of the third embodiment of the present application. Figure 14Figure 6 is a schematic view of the structure of the helium injection nozzle 100 of the third embodiment of the present application and the pole column 220 in cooperation. Figure 15 Figure 7 is a schematic view of the structure of the helium injection nozzle 100 of the fourth embodiment of the present application and the pole column 220 in cooperation. Figure 16 Figure 8 is a schematic view of the structure of the helium injection nozzle 100 of the fourth embodiment of the present application and the pole column 220 in separation. Figure 17 Figure 9 is a schematic view of the structure of the helium injection nozzle 100 of the fourth embodiment of the present application and the pole column 220 in cooperation.

[0099] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17 , the helium injection assembly 10 according to the first aspect of the present application is used for the battery cell 200. The battery cell 200 comprises a pole column 220. The pole column 220 is provided with at least one cooperation surface 221 and an injection port 224. The injection port 224 is arranged on the at least one cooperation surface 221. The helium injection assembly 10 comprises a helium injection nozzle 100 and a plurality of sealing surfaces 120. The helium injection nozzle 100 is provided with a helium injection channel 110, both ends of the helium injection channel 110 penetrating through the outer wall of the helium injection nozzle 100 along a first direction. The plurality of sealing surfaces 120 are arranged on the helium injection nozzle 100, and the plurality of sealing surfaces 120 are located on the outer periphery of the helium injection channel 110. In the case where the helium injection nozzle 100 cooperates with the pole column 220, the plurality of sealing surfaces 120 respectively abut against the at least one cooperation surface 221. The helium injection channel 110 is in communication with the injection port 224.

[0100] Since both ends of the helium injection channel 110 penetrate through the outer wall of the helium injection nozzle 100 along the first direction, that is, along the first direction, the helium injection nozzle 100 comprises a first side and a second side opposite to each other, one end of the helium injection channel 110 penetrates through the first side of the helium injection nozzle 100, and the other end of the helium injection channel 110 penetrates through the second side of the helium injection nozzle 100.

[0101] The plurality of sealing surfaces 120 are arranged on the helium injection nozzle 100. Exemplarily, the plurality of sealing surfaces 120 are all arranged on the first side of the helium injection nozzle 100. Alternatively, at least one sealing surface 120 is arranged on the first side of the helium injection nozzle 100, and at least one sealing surface 120 is arranged on the outer peripheral side of the helium injection nozzle 100.

[0102] Exemplarily, the number of the sealing surfaces 120 can be two, three, four or five. The number can be set according to actual needs.

[0103] The plurality of sealing surfaces 120 are located at the outer periphery of the helium injection channel 110, that is, the plurality of sealing surfaces 120 are all arranged around the helium injection channel 110.

[0104] When the helium injection nozzle 100 is matched with the pole column 220, because the plurality of sealing surfaces 120 respectively abut against at least one matching surface 221 of the pole column 220, a multiple sealing is formed, the compatibility with the welding slag is improved, even if there is welding slag on a certain sealing surface 120, the sealing effect of other sealing surfaces 120 is not affected, the risk of overkill caused by the destruction of the air tightness between the pressing surface of the helium injection nozzle 100 and the pole column 220 due to poor sealing of one time is reduced, the effectiveness of the sealing is improved, and the service life of the helium injection nozzle 100 is prolonged.

[0105] Moreover, because the helium injection nozzle 100 and the pole column 220 form a multiple sealing, the wiping frequency or replacement frequency of the helium injection nozzle 100 can be effectively reduced, the production rhythm of the battery monomer 200 can be significantly improved, and the manufacturing efficiency of the battery monomer 200 is improved, and the production capacity is improved.

[0106] In some embodiments, optionally, the pole column 220 is further provided with a matching groove 225, the matching groove 225 is in communication with the injection port 224, wherein the groove bottom wall of the matching groove 225 is formed as a matching surface 221, and / or the groove side wall of the matching groove 225 is formed as a matching surface 221.

[0107] In some embodiments, optionally, the top surface of the pole column 220 is formed as a matching surface 221.

[0108] It should be noted that the first direction is the Z direction, that is, the first direction is the height direction of the battery monomer 200.

[0109] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , and Figure 12 In some embodiments, the at least one matching surface 221 includes a first matching surface 222, and the injection port 224 is arranged on the first matching surface 222. Along the first direction, the plurality of sealing surfaces 120 are arranged on the first side of the helium injection nozzle 100, and the plurality of sealing surfaces 120 are arranged along a second direction. When the helium injection nozzle 100 is matched with the pole column 220, the plurality of sealing surfaces 120 respectively abut against the first matching surface 222. The second direction intersects the first direction.

[0110] In this embodiment, the number of the mating surface 221 is one, i.e., the first mating surface 222. When the helium injection nozzle 100 is matched with the pole column 220, the plurality of sealing surfaces 120 are all in abutment with the first mating surface 222 to form a multi-surface sealing.

[0111] Since the plurality of sealing surfaces 120 are arranged along the second direction, when the plurality of sealing surfaces 120 are respectively in abutment with the first mating surface 222, i.e., a multi-surface sealing is formed at the outer periphery of the injection port 224, it is beneficial to improve the sealing effect between the helium injection nozzle 100 and the first mating surface 222, and compared with the related art in which the bottom surface of the helium injection nozzle is directly pressed on the pressing surface where the liquid injection port is located to perform single-surface sealing, the welding slag in the welding area is as compatible as possible, the influence of the welding slag due to the positive pole column 220 is reduced, the sealing effectiveness is improved, the risk of helium detection overkill of the battery monomer 200 is reduced, and the production rhythm of the battery monomer 200 is effectively improved.

[0112] It should be noted that the second direction is the X direction, i.e., the radial direction of the battery monomer 200.

[0113] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 , in some embodiments, the first side of the helium injection nozzle 100 is also provided with a groove 130. The groove 130 is located between any two adjacent sealing surfaces 120.

[0114] That is, at least two adjacent sealing surfaces 120 are separated by the groove 130, thereby forming at least two relatively independent sealing surfaces 120, which can effectively reduce the influence of the two adjacent sealing surfaces 120 on each other, i.e., even if one of the two adjacent sealing surfaces 120 is adhered with welding slag, it does not affect the sealing effect between the other sealing surface 120 and the first mating surface 222, which is beneficial to improve the effectiveness of the sealing between the helium injection nozzle 100 and the pole column 220.

[0115] It should be noted that since the helium injection nozzle 100 is compressed during helium injection to tightly match the helium injection nozzle 100 with the pole column 220, the depth of the groove 130 is related to the hardness of the helium injection nozzle 100. Specifically, if the hardness of the helium injection nozzle 100 is small, i.e., the helium injection nozzle 100 is soft, the deformation amount of the helium injection nozzle 100 is large when the helium injection nozzle 100 is compressed, and the depth of the groove 130 can be set to be relatively deep to avoid the groove 130 being filled to affect the separation effect between the two adjacent sealing surfaces 120, and the two adjacent sealing surfaces 120 do not interfere with each other.

[0116] In some embodiments, the groove 130 is configured as an annular groove; and / or there are multiple grooves 130, which are spaced apart along a second direction.

[0117] Since the groove 130 is set as an annular groove, any two adjacent sealing surfaces 120 can be made to not interfere with each other. Even if there is welding slag on one of the sealing surfaces 120, it will not affect the sealing effect between the other sealing surface 120 and the first mating surface 222, thus maximizing the compatibility with the influence of welding slag caused by the positive electrode external welding.

[0118] Since there are multiple grooves 130, and these grooves 130 are spaced apart along the second direction, when the helium injection nozzle 100 mates with the electrode post 220, a series of labyrinth seal structures can be formed between the helium injection nozzle 100 and the first mating surface 222. This increases the number of sealing surfaces 120, improves the sealing effect between the helium injection nozzle 100 and the first mating surface 222, and helps to improve the accuracy of helium testing, reduce the number of retests, and increase the manufacturing efficiency of the battery cell 200.

[0119] It should be noted that the number of grooves 130 should not be too large. With a fixed area of ​​the side of the helium nozzle 100 facing the injection port 224, the more grooves 130 there are, the less the sealing area of ​​a single sealing surface 120 will be.

[0120] like Figure 9 As shown, in some embodiments, the depth of the groove 130 along the first direction is h, wherein 1.2mm≤h≤1.65mm.

[0121] Understandably, if the groove 130 is too shallow (less than 1.2mm), it will easily fill when the helium filling nozzle 100 is compressed, failing to effectively separate the two adjacent sealing surfaces 120, causing them to form a single plane. If the groove 130 is too deep (greater than 1.65mm), it will reduce the overall structural strength of the helium filling nozzle 100, increasing its deformation and reducing its service life when compressed.

[0122] By setting the depth of the groove 130 between 1.2mm and 1.65mm, when the helium injection nozzle 100 is compressed, it can effectively separate two adjacent sealing surfaces 120, improve the compatibility of the helium injection nozzle 100 with welding slag, and at the same time improve the overall structural strength of the helium injection nozzle 100 and extend the service life of the helium injection nozzle 100.

[0123] Optionally, along the first direction, the depth of the groove 130 can be any one of 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm and 1.65mm.

[0124] As shown in Figure 5 , Figure 9 and Figure 10 , in some embodiments, the helium injection nozzle 100 comprises a body 140 and an injection nozzle 150. In the first direction, the injection nozzle 150 and the plurality of sealing surfaces 120 are respectively arranged on the first side of the body 140, and the plurality of sealing surfaces 120 are located on the outer periphery of the injection nozzle 150. A part of the helium injection channel 110 is arranged in the body 140, and another part is arranged in the injection nozzle 150. Among them, when the helium injection nozzle 100 is matched with the pole column 220, the injection nozzle 150 is inserted into the injection port 224.

[0125] That is, when the helium injection nozzle 100 is matched with the pole column 220, in addition to the plurality of sealing surfaces 120 abutting against the first matching surface 222 to form a multi-surface seal, the injection nozzle 150 is inserted into the injection port 224, so that the positioning of the helium injection nozzle 100 can be facilitated while achieving multiple seals and improving the compatibility of the helium injection nozzle 100 with the slag, solving the problem of single-sided sealing deviation between the helium injection nozzle 100 and the first matching surface 222 due to poor centering, improving the sealing effect between the helium injection nozzle 100 and the first matching surface 222, reducing the probability of overkill, and facilitating the improvement of the production rhythm of the battery monomer 200.

[0126] Exemplarily, the injection nozzle 150 and the body 140 are in an integral structure.

[0127] In some embodiments, when the helium injection nozzle 100 is matched with the pole column 220, the outer wall of the injection nozzle 150 is in interference fit with the inner wall of the injection port 224.

[0128] That is, when the injection nozzle 150 is inserted into the injection port 224, the outer wall of the injection nozzle 150 is tightly fitted with the inner wall of the injection port 224, thereby increasing the side seal between the helium injection nozzle 100 and the pole column 220, improving the positioning accuracy of the helium injection nozzle 100, avoiding overkill due to the decrease in the single-sided sealing amount of the helium injection nozzle 100, and facilitating the further improvement of the sealing effect between the helium injection nozzle 100 and the pole column 220.

[0129] As shown in Figure 9 and Figure 10 , in some embodiments, the injection nozzle 150 is provided with a guide wall 152 at the end away from the body 140. At least a part of the guide wall 152 is configured as an outwardly convex arc-shaped wall.

[0130] That is, the outwardly convex arc-shaped wall is arranged at the insertion end of the injection nozzle 150, that is, the chamfer structure is arranged at the insertion end of the injection nozzle 150, thereby playing a guiding role in the process of inserting the injection nozzle 150 into the injection port 224, and facilitating the improvement of the efficiency of the helium detection process.

[0131] AsFigure 9 and Figure 10 As shown, in some embodiments, the injection nozzle 150 has a mating wall 154 at one end near the body 140. The mating wall 154 is used to contact the inner wall of the injection port 224. At least a portion of the mating wall 154 is configured as an inwardly concave arcuate wall.

[0132] In other words, by providing an inwardly recessed arc-shaped wall at the connection between the injection nozzle 150 and the body 140, i.e., by providing a chamfered structure at the connection between the injection nozzle 150 and the body 140, wear on the injection nozzle 150 during insertion into the injection port 224 can be reduced. Furthermore, it increases the contact area between the injection nozzle 150 and the inner wall of the injection port 224, which is beneficial for further improving the sealing effect between the helium injection nozzle 100 and the electrode post 220.

[0133] Optionally, the inner wall of the end of the injection port 224 away from the receiving cavity 212 is configured as an arc-shaped wall.

[0134] In some embodiments, the width of the body 140 gradually increases in the direction away from the injection nozzle 150 in the second direction.

[0135] In other words, the width of the upper end of the body 140 in the second direction is greater than the width of the lower end of the body 140 in the second direction, which means the outer diameter of the upper end of the body 140 is greater than the outer diameter of the lower end of the body 140. This facilitates the fit between the helium injection nozzle 100 and the electrode post 220 during the helium injection process, and helps improve the efficiency of the helium testing process.

[0136] like Figure 5 and Figure 9 As shown, in some embodiments, the helium injection channel 110 includes a first channel 112 and a second channel 114. The first channel 112 is disposed on the body 140, and one end of the first channel 112 penetrates the outer wall of the body 140. At least a portion of the second channel 114 is disposed on the injection nozzle 150, one end of the second channel 114 is connected to the other end of the first channel 112, and the other end of the second channel 114 penetrates the outer wall of the injection nozzle 150. Wherein, along the second direction, the width of the second channel 114 is smaller than the width of the first channel 112.

[0137] Optionally, the second channel 114 is disposed within the injection nozzle 150. Alternatively, a portion of the second channel 114 is disposed within the injection nozzle 150, and another portion is disposed within the body 140.

[0138] Since the width of the second channel 114 in the second direction is smaller than the width of the first channel 112 in the second direction, that is, the width of the second channel 114 arranged inside the injection nozzle 150 in the second direction is arranged to be smaller, during the helium injection process, helium can enter the inside of the battery monomer 200 through the first channel 112 and the second channel 114 in turn, while avoiding the problem that the width of the second channel 114 is too wide, which causes the wall thickness of the injection nozzle 150 to be too thin, thereby affecting the service life of the helium injection nozzle 100.

[0139] As shown in Figure 9 some embodiments, the width of the at least one sealing surface 120 in the second direction is n, where n≥0.6mm.

[0140] That is, the width of a single sealing surface 120 in the second direction is greater than or equal to 0.6mm, so that when the helium injection nozzle 100 is matched with the pole column 220, the problem of poor sealing between the single sealing surface 120 and the first matching surface 222 due to the small contact area can be avoided, which is beneficial to further improve the sealing effect between the helium injection nozzle 100 and the first matching surface 222.

[0141] Optionally, the width of the at least one sealing surface 120 in the second direction can be any one of 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm.

[0142] In some embodiments, the sealing surface 120 is configured as an annular sealing surface, and the centers of the at least two annular sealing surfaces coincide.

[0143] That is, the at least two annular sealing surfaces are formed as concentric circular ring structures, on the one hand, facilitating the processing of the sealing surface 120 and the groove 130, which is beneficial to reduce the manufacturing cost of the helium injection nozzle 100. On the other hand, since the sealing surface 120 is annular, that is, a multi-surface seal is formed on the outer peripheral side of the injection port 224, which is beneficial to further improve the sealing effect between the helium injection nozzle 100 and the pole column 220.

[0144] As shown in Figure 12 some embodiments, the side of the helium injection nozzle 100 away from the plurality of sealing surfaces 120 includes a first surface 160. Among them, the distance between at least two sealing surfaces 120 in the plurality of sealing surfaces 120 and the first surface 160 in the first direction is different.

[0145] In other words, at least two sealing steps are formed on the first side of the helium injection nozzle 100. When the helium injection nozzle 100 is engaged with the electrode post 220, at least two sealing steps contact the first mating surface 222 individually to achieve sealing. Even if welding slag adheres to one of the sealing steps, it does not affect the sealing effect between the other sealing steps and the first mating surface 222, so that the helium injection nozzle 100 and the electrode post 222 are effectively sealed, which can effectively reduce the risk of over-kill due to single-point sealing failure.

[0146] Optionally, the plurality of sealing surfaces 120 include a first sealing surface 122 and a second sealing surface 124, wherein the second sealing surface 124 is located outside the first sealing surface 122 along a second direction. Wherein, along a first direction, the distance between the second sealing surface 124 and the first surface 160 is less than the distance between the first sealing surface 122 and the first surface 160. Alternatively, along the first direction, the distance between the second sealing surface 124 and the first surface 160 is greater than the distance between the first sealing surface 122 and the first surface 160.

[0147] like Figure 12 As shown, in some embodiments, the distance between the plurality of sealing surfaces 120 and the first surface 160 in the first direction gradually decreases along the direction away from the helium injection channel 110.

[0148] In other words, the distance between the outer sealing surface 120 and the first surface 160 in the first direction is smaller than the distance between the inner sealing surface 120 and the first surface 160 in the first direction, thus forming multiple sealing steps. When the helium injection nozzle 100 mates with the terminal post 220, the multiple sealing steps individually contact the first mating surface 222 to achieve sealing, improving the helium injection nozzle 100's ability to accommodate welding slag, reducing the probability of over-cleaning, and helping to increase the production cycle of the battery cell 200.

[0149] like Figure 12 As shown, in some embodiments, the helium injection assembly 10 further includes a helium injection rod 170 and a plurality of elastic members 180. The helium injection rod 170 is disposed on the side of the helium injection nozzle 100 opposite to the plurality of sealing surfaces 120. The plurality of elastic members 180 are disposed on the helium injection rod 170 and located between the helium injection rod 170 and the helium injection nozzle 100. Furthermore, along a first direction, the plurality of elastic members 180 are respectively disposed opposite to the plurality of sealing surfaces 120.

[0150] Since multiple elastic elements 180 are respectively arranged opposite to multiple sealing surfaces 120 in the first direction, the compression amount of each elastic element 180 can be adjusted individually according to the setting position of each sealing surface 120, thereby adjusting the force on each sealing surface 120 when the helium injection nozzle 100 and the pole post 220 are engaged. For example, different elastic forces can be preset for the corresponding elastic elements 180 for different sealing steps, and the various sealing surfaces 120 do not affect each other, which is beneficial to further improve the compatibility of the helium injection nozzle 100 with welding slag.

[0151] Exemplarily, the elastic member 180 can include a metal spring or a rubber spring. Among them, springs with different elastic coefficients can be set for different sealing steps to control the force of each sealing step and achieve mutual non-interference.

[0152] As shown in Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17 , in some embodiments, the at least one mating surface 221 includes a first mating surface 222 and a second mating surface 223. The injection port 224 is provided on the first mating surface 222. The plurality of sealing surfaces 120 includes a first sealing surface 122 and a second sealing surface 124. In the case where the helium injection nozzle 100 is matched with the pole column 220, the first sealing surface 122 abuts against the first mating surface 222, and the second sealing surface 124 abuts against the second mating surface 223.

[0153] Since the at least one mating surface 221 includes the first mating surface 222 and the second mating surface 223, that is, two mating surfaces 221 are provided on the pole column 220. When injecting helium, the first sealing surface 122 abuts against one of the mating surfaces 221, and the second sealing surface 124 abuts against the other mating surface 221, thereby forming a multi-surface sealing, which is conducive to improving the sealing effect between the helium injection nozzle 100 and the pole column 220. Compared with the prior art in which the bottom surface of the helium injection nozzle is directly pressed on the pressing surface where the liquid injection port is located to perform single-surface sealing, the helium injection nozzle 100 can as far as possible be compatible with the welding slag in the welding area, reduce the influence of the welding slag caused by the positive pole column 220, improve the sealing effectiveness, reduce the risk of helium detection overkill of the battery monomer 200, and effectively improve the production rhythm of the battery monomer 200.

[0154] As shown in Figure 13 and Figure 14 , in some embodiments, the pole column 220 is also provided with a mating groove 225, which is in communication with the injection port 224 when the helium injection nozzle 100 is matched with the pole column 220. The groove bottom wall of the mating groove 225 is formed as the first mating surface 222. The second mating surface 223 is located on the outer periphery of the mating groove 225. The helium injection nozzle 100 includes a body 140 and an injection nozzle 150. In the first direction, the injection nozzle 150 and the second sealing surface 124 are respectively provided on the first side of the body 140. The first sealing surface 122 is provided on the side of the injection nozzle 150 away from the body 140. A part of the helium injection channel 110 is provided on the body 140, and the other part is provided on the injection nozzle 150. Among them, in the case where the helium injection nozzle 100 is matched with the pole column 220, the injection nozzle 150 is located in the mating groove 225.

[0155] Since the second matching surface 223 is located at the outer periphery of the matching groove 225, that is, the top end surface of the pole 220 is formed as the second matching surface 223. The first sealing surface 122 is arranged on the injection nozzle 150, and the second sealing surface 124 is arranged on the body 140.

[0156] When the helium injection nozzle 100 is matched with the pole 220, the injection nozzle 150 is inserted into the matching groove 225, and the first sealing surface 122 on the injection nozzle 150 abuts against the groove bottom wall of the matching groove 225, and the second sealing surface 124 on the body 140 abuts against the top end surface of the pole 220, thereby forming multi-surface sealing between the helium injection nozzle 100 and the pole 220, that is, even if the first sealing surface 122 adheres with welding slag, the sealing effect between the second sealing surface 124 and the pole 220 is not affected, so that the helium injection nozzle 100 and the pole 220 are effectively sealed.

[0157] In some embodiments, the length of the injection nozzle 150 is greater than the depth of the matching groove 225 in the first direction when the helium injection nozzle 100 is separated from the pole 220.

[0158] That is, when the helium injection nozzle 100 is not compressed, that is, the helium injection nozzle 100 is in a natural state, the length of the injection nozzle 150 is greater than the depth of the matching groove 225.

[0159] It can be understood that when the helium injection nozzle 100 is in a natural state, if the length of the injection nozzle 150 is less than the depth of the matching groove 225, when the second matching surface 223 abuts against the second sealing surface 124, the first matching surface 222 is separated from the first sealing surface 122, and multi-surface sealing cannot be achieved. When the helium injection nozzle 100 is in a natural state, if the length of the injection nozzle 150 is equal to the depth of the matching groove 225, when the helium injection is performed, the helium injection nozzle 100 is compressed, and if the first sealing surface 122 and the first matching surface 222 are tightly sealed, there is a case that the middle region of the helium injection nozzle 100 is concave, which affects the sealing effect between the second sealing surface 124 and the second matching surface 223.

[0160] Since when the helium injection nozzle 100 is in a natural state, the length of the injection nozzle 150 is greater than the depth of the matching groove 225, when the helium injection is performed, the helium injection nozzle 100 is compressed, the first sealing surface 122 can abut against the first matching surface 222, and the second sealing surface 124 can abut against the second matching surface 223, thereby achieving multi-surface sealing and maintaining the effectiveness of multi-surface sealing.

[0161] As shown in FIGS. Figure 13 and Figure 14 In some embodiments, the inner diameter of the first sealing surface 122 is d1, where 0.5mm≤d1≤2mm; and / or the outer diameter of the first sealing surface 122 is d2, where 3mm≤d2≤10mm; and / or the outer diameter of the second sealing surface 124 is d3, where 10mm≤d3≤25mm.

[0162] Since the inner diameter of the first sealing surface 122 is between 0.5mm and 2mm and the outer diameter is between 3mm and 10mm, the contact area between the first sealing surface 122 and the first mating surface 222 is set to be large, thereby improving the sealing effect between the first sealing surface 122 and the first mating surface 222.

[0163] Since the outer diameter of the second sealing surface 124 is between 10mm and 25mm, that is, the outer diameter of the second sealing surface 124 is set to be relatively large, the second sealing surface 124 and the top surface (second mating surface 223) of the pole post 220 can have sufficient contact area, which is conducive to improving the sealing effect between the second mating surface 223 and the second sealing surface 124, thereby improving the effectiveness of multi-faceted sealing and reducing the risk of helium detection overkill.

[0164] Optionally, the inner diameter of the first sealing surface 122 can be any one of 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm and 2mm.

[0165] Optionally, the outer diameter of the first sealing surface 122 can be any one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm.

[0166] Optionally, the outer diameter of the second sealing surface 124 can be any one of 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm and 25mm.

[0167] like Figure 15 and Figure 16 As shown, in some embodiments, the electrode post 220 is further provided with a mating groove 225, which communicates with the injection port 224. The bottom wall of the mating groove 225 is formed as a first mating surface 222. The side wall of the mating groove 225 is formed as a second mating surface 223. The bottom wall of the helium injection nozzle 100 is formed as a first sealing surface 122. The side wall of the helium injection nozzle 100 is formed as a second sealing surface 124. When the helium injection nozzle 100 is separated from the electrode post 220, the width of the helium injection nozzle 100 is smaller than the width of the mating groove 225 along the second direction. The second direction intersects with the first direction.

[0168] Because the bottom wall of the mating groove 225 is formed as the first mating surface 222, and the side wall of the mating groove 225 is formed as the second mating surface 223, when the helium injection nozzle 100 mates with the pole post 220, the bottom wall of the helium injection nozzle 100 abuts against the bottom wall of the mating groove 225 to form a bottom seal, and the outer wall of the helium injection nozzle 100 abuts against the side wall of the mating groove 225 to form a side seal, thus forming a multi-faceted seal.

[0169] During helium filling, the helium filling nozzle 100 is first inserted into the mating groove 225, and then the nozzle 100 is compressed so that the first sealing surface 122 abuts against the first mating surface 222, and the second sealing surface 124 abuts against the second mating surface 223. Since the width of the helium filling nozzle 100 in the second direction is smaller than the width of the mating groove 225 in the second direction when the nozzle 100 is separated from the electrode post 220 (i.e., when the nozzle 100 is not inserted into the mating groove 225), the nozzle 100 can smoothly mate with the mating groove 225 before being compressed, facilitating insertion and improving the efficiency of the helium testing process.

[0170] It is worth noting that when the helium injection nozzle 100 is inserted into the mating groove 225 and the helium injection nozzle 100 is compressed, the width of the helium injection nozzle 100 in the second direction increases, so that the outer wall of the helium injection nozzle 100 abuts against the groove side wall of the mating groove 225, forming a multi-faceted seal.

[0171] like Figure 16 and Figure 17 As shown, in some embodiments, when the helium injection nozzle 100 is separated from the electrode post 220, the width of the helium injection nozzle 100 in the second direction is L1. The width of the mating groove 225 is L2, wherein 0.2mm ≤ (L2-L1) / 2 ≤ 2mm; and / or when the helium injection nozzle 100 is mated with the electrode post 220, the width of the helium injection nozzle 100 in the second direction is L3, wherein 0.5mm ≤ L3-L1 ≤ 5mm.

[0172] Since (L2-L1) / 2 is between 0.2mm and 2mm, that is, when the helium injection nozzle 100 is inserted into the mating groove 225 and is not compressed, the single-sided gap formed between the outer wall of the helium injection nozzle 100 and the groove side wall of the mating groove 225 is between 0.2mm and 2mm.

[0173] Understandably, if the single-sided gap is too small, less than 0.2mm, interference may occur during the insertion of the helium filling nozzle 100 into the mating groove 225 due to misalignment, affecting helium inspection efficiency. If the single-sided gap is too large, greater than 2mm, the hardness of the helium filling nozzle 100 needs to be set softer so that when the nozzle 100 is compressed, its diameter increases to abut against the side wall of the groove, forming a side seal. However, if the hardness of the nozzle 100 is too soft, it will easily adhere to welding slag, reducing its service life. Furthermore, if the position of the helium filling nozzle 100 is offset when inserted into the mating groove 225, there will be insufficient single-sided sealing between the bottom wall of the nozzle 100 and the bottom wall of the groove 225, affecting the sealing effect.

[0174] When the helium injection nozzle 100 is not compressed, the single-sided gap between the outer side wall of the helium injection nozzle 100 and the slot side wall of the matching slot 225 is between 0.2 mm and 2 mm. While the helium injection nozzle 100 is smoothly matched with the matching slot 225, when the helium injection nozzle 100 is compressed, the diameter of the helium injection nozzle 100 can form a side seal with the slot side wall of the matching slot 225 after appropriately increasing, and compatible with the moderate problem, which is beneficial to improve the sealing effect between the helium injection nozzle 100 and the pole 220.

[0175] Optionally, (L2-L1) / 2 can be any one of 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm and 2 mm.

[0176] Since L3-L1 is between 0.5 mm and 5 mm when the helium injection nozzle 100 is matched with the pole 220, that is, when the helium injection nozzle 100 is compressed, the expansion value of the diameter of the helium injection nozzle 100 is between 0.5 mm and 5 mm, and when the helium injection nozzle 100 is compressed, the outer side wall of the helium injection nozzle 100 can abut against the slot side wall of the matching slot 225, thereby forming a side seal.

[0177] Optionally, L3-L1 can be any one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm and 5 mm.

[0178] In some embodiments, the hardness of the helium injection nozzle 100 is greater than or equal to 25 HA and less than or equal to 75 HA, and HA represents Shore A hardness.

[0179] If the hardness of the helium injection nozzle 100 is too small, that is, less than 25 HA, the deformation amount of the helium injection nozzle 100 will be larger after repeated compression, which may cause permanent deformation, cannot be used for a long time, affects the service life of the helium injection nozzle 100, and the hardness of the helium injection nozzle 100 is too small, which is more prone to adhere to the slag. If the hardness of the helium injection nozzle 100 is too large, that is, greater than 75 HA, it will result in poor sealing between the helium injection nozzle 100 and the pole 220, and poor compatibility with the slag.

[0180] Since the hardness of the helium injection nozzle 100 is between 25 HA and 75 HA, the sealing effect between the helium injection nozzle 100 and the pole 220 can be improved, and the compatibility with the slag is improved, which is beneficial to prolong the service life of the helium injection nozzle 100.

[0181] It can be understood that the hardness of the helium injection nozzle 100 is related to the compression amount of the helium injection nozzle 100.

[0182] Optionally, the hardness of the helium injection nozzle 100 can be any one of 25HA, 30HA, 35HA, 40HA, 45HA, 50HA, 55HA, 60HA, 65HA, 70HA and 75HA.

[0183] In some embodiments, the helium injection nozzle 100 comprises a rubber piece.

[0184] Since the helium injection nozzle 100 is a rubber piece, it can be understood that the rubber piece is a flexible material piece with low hardness, which can make the helium injection nozzle 100 have a certain compression amount when injecting helium, thereby facilitating the improvement of the sealing effect between the helium injection nozzle 100 and the pole 220.

[0185] Optionally, the compression amount of the helium injection nozzle 100 can be between 20% and 30%.

[0186] In some embodiments, the rubber piece comprises nitrile rubber, fluororubber, silicone rubber or ethylene propylene diene rubber.

[0187] The rubber piece can be nitrile rubber. Alternatively, the rubber piece can be fluororubber. Alternatively, the rubber piece can be silicone rubber. Alternatively, the rubber piece can be ethylene propylene diene rubber. The ethylene propylene diene rubber is a synthetic rubber. It can be set according to actual needs.

[0188] In a first specific embodiment, as shown in Figure 9 , Figure 10 and Figure 11 , in the helium detection process, the material of the helium injection nozzle 100 can be one of nitrile rubber, fluororubber, silicone rubber and ethylene propylene diene rubber. The material hardness of the helium injection nozzle 100 is 30 Shore hardness to 75 Shore hardness. The hardness of the material needs to be reasonably set according to the sealing effect and service life. Low hardness, the sealing effect of the helium injection nozzle 100 is better, the particle (welding slag) compatibility is higher, but the service life is poorer, the deformation amount is larger, which may cause permanent deformation and cannot be used for a long time. High hardness, the particle (welding slag) compatibility of the helium injection nozzle 100 is poor, the sealing performance is poor, but the service life is longer. Therefore, the selection of material and hardness needs to be flexibly set according to the actual situation and the size of the groove 130, so as to avoid the filling of the groove 130 due to the soft hardness and large deformation amount, and avoid the low compressibility and poor sealing performance due to the high hardness.

[0189] The calculation process of the compression amount is as follows:

[0190] The hardness and material of the material can be calculated according to the empirical formula of the elastic modulus (E): E=0.0981×(56+7.66×H), wherein H is the Shore hardness.

[0191] E=σ / ε= Wherein, σ is stress, ε is strain, F is the force of the helium injection nozzle 100, A is the contact area of the helium injection nozzle 100 and the pressing surface (the first matching surface 222), ΔL is the compression amount of the helium injection nozzle 100, and L0 is the initial length of the helium injection nozzle 100.

[0192] When the hardness of the helium injection nozzle 100 is known, the corresponding elastic modulus can be estimated by an empirical formula, and the compression amount can be calculated by the force and the contact area of the helium injection nozzle 100.

[0193] The injection nozzle 150 and the injection port 224 are in interference fit to form a side seal. The part of the helium injection nozzle 100 in plane contact with the liquid injection port (the injection port 224) of the pole 220 is a plurality of sealing surfaces 120 for plane sealing. The helium injection nozzle 100 is provided with a chamfer (the guide wall 152 and the matching wall 154), which is more conducive to the cooperation of the helium injection nozzle 100 and the liquid injection port (the injection port 224) to form a guiding effect. The plurality of sealing surfaces 120 includes two planes that do not interfere with each other, and the two planes are in contact with the pole 220, and the two planes are divided by the groove 130.

[0194] The depth of the groove 130 is 1.2mm-1.65mm, and the deformation amount of the helium injection nozzle 100 after being compressed is 20%-30%, and the groove 130 will not be filled during the compression process of the helium injection nozzle 100. The contact surface of the helium injection nozzle 100 and the pole 220 can be one groove 130 or a plurality of grooves 130, which can form a series of labyrinth seals. The annular groove structure can be flexibly set according to the actual helium injection nozzle surface (the contact surface of the helium injection nozzle 100 and the first matching surface 222), and the single sealing surface 120 needs to consider the sealing area to avoid too many grooves 130, which will result in too few single sealing surfaces 120 and cause poor sealing and overkill.

[0195] The helium gas passes through the helium injection channel 110 and the liquid injection port (the injection port 224) to reach the inside of the battery, wherein the injection nozzle 150 and the liquid injection port (the injection port 224) form a side seal, and the side of the liquid injection port (the injection port 224) is usually not contaminated. The part in plane contact with the pole 220 is a plurality of sealing surfaces 120, forming a multi-surface seal. Even if the side seal fails, there are still multiple plane seals, and the centering degree of the helium injection nozzle 100 is also improved during the formation of the side seal, avoiding the reduction of single-sided sealing amount.

[0196] As Figure 2 and Figure 4As shown, the cylindrical battery (battery monomer 200) includes a steel shell main body (shell 210), a plastic polar column and a polar column part (polar column 220), and the welding process will have welding slag splashing, resulting in a large amount of metal welding slag on the surface of the liquid injection hole (injection port 224). During the long-time pressing process of the helium injection nozzle 100, a large amount of metal welding slag will accumulate on the surface of the helium injection nozzle 100. During the sealing process, the welding slag will cause the surface of the helium injection nozzle 100 to be uneven, thereby causing local leakage, resulting in failure to seal, and causing overkill.

[0197] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , the polar column 220 cooperates with the helium injection nozzle 100 to form a multi-surface seal, and the liquid injection port (injection port 224) cooperates with the helium injection nozzle (injection nozzle 150) to form a side seal, thereby forming a multi-surface seal, effectively improving the compatibility of the welding slag, improving the positioning accuracy, avoiding the failure of the helium detection caused by the poor sealing of the first seal, prolonging the service life, reducing the wiping frequency, and improving the production rhythm.

[0198] In a second specific embodiment, as shown in Figure 12 , the material of the helium injection nozzle 100 is one of nitrile rubber, fluororubber, silicone rubber and ethylene-propylene-diene rubber. The helium injection nozzle 100 includes a plurality of sealing steps (sealing surfaces 120), and each sealing surface 120 cooperates with the helium injection rod 170. The helium injection rod 170 is provided with a spring (elastic member 180) inside, and the compression amount of the spring (elastic member 180) inside the helium injection rod 170 can be adjusted to adjust the stress of each surface (sealing surface 120) and improve the sealing reliability. The number of sealing surfaces 120 can be flexibly set according to the area of the helium injection nozzle 100.

[0199] Specifically, the helium injection nozzle 100 is installed in the helium injection rod 170, and different spring forces are preset inside the helium injection rod 170 for each helium injection nozzle step (sealing surface 120), that is, different spring pressures are corresponded according to the step height, each sealing surface 120 can be individually contacted and sealed, and each sealing surface 120 does not affect each other, that is, even if there is welding slag on a certain sealing surface 120, it does not affect the sealing effect of another sealing surface 120, and the risk of single-point failure can be reduced.

[0200] In a third specific embodiment, as shown in Figure 13 and Figure 14 , the helium injection nozzle 100 is a T-shaped structure, wherein the helium injection nozzle 100 includes an upper sealing surface (second sealing surface 124) and a lower sealing surface (first sealing surface 122). The upper sealing surface (second sealing surface 124) of the helium injection nozzle 100 cooperates with the polar column 220 to seal, and the lower sealing surface (first sealing surface 122) cooperates with the liquid injection port (injection port 224) to seal, thereby forming a multi-seal.

[0201] The length of the helium injection nozzle (injection nozzle 150) is designed according to the depth of the liquid injection port (fitting groove 225). When the lower sealing surface (first sealing surface 122) of the helium injection nozzle (injection nozzle 150) is matched with the liquid injection port plane (first fitting surface 222), the upper sealing surface (second sealing surface 124) is matched with the pole column 220, and the two layers of sealing are effective.

[0202] The diameter of the upper sealing surface (second sealing surface 124) is 10mm-25mm, and the outer diameter of the lower sealing surface (first sealing surface 122) is 3mm-10mm and the inner diameter is 0.5mm-2mm. This scheme further expands the sealing area, reduces the surface pressure under the same force, and reduces the compression amount. Under the same conditions, the sealing effect is reduced, so different forces need to be matched according to the actual area increase to achieve the same compression amount and sealing effect.

[0203] In a fourth specific embodiment, as shown in Figure 15 , Figure 16 and Figure 17 , wherein, Figure 16 is the cross-sectional view of the helium injection nozzle 100 matched with the liquid injection hole (injection port 224) of the pole column 220. At this time, the helium injection nozzle 100 is not compressed, the side wall (second sealing surface 124) of the helium injection nozzle 100 does not contact the side edge of the pole column (the groove side wall of the fitting groove 225), and the side wall of the helium injection nozzle 100 and the side wall of the pole column have a distance of 0.2mm~2mm on one side. The helium injection nozzle 100 can be smoothly matched with the pole column liquid injection port (fitting groove 225) before being compressed, avoiding interference caused by centering problems.

[0204] The lower bottom surface (first sealing surface 122) of the helium injection nozzle 100 is matched with the liquid injection hole plane (first fitting surface 222), as shown in Figure 17 When the helium injection nozzle 100 is compressed, the diameter of the helium injection nozzle 100 will expand, the side wall (second sealing surface 124) of the helium injection nozzle is matched with the side wall (groove side wall of the fitting groove 225) of the pole column to form a side sealing, and the lower bottom surface (first sealing surface 122) of the helium injection nozzle is in contact with the bottom wall of the liquid injection hole (the bottom wall of the fitting groove 225) to form a bottom sealing. When designing, the hardness and compression amount of the helium injection nozzle 100 need to be considered. The diameter of the helium injection nozzle 100 expands by 0.5mm-5mm, and the compression amount is 20%-30%.

[0205] The above description of each embodiment tends to emphasize the differences between each embodiment, and the same or similar parts can be referred to each other. For the sake of brevity, the same or similar parts will not be described hereinafter.

[0206] In the description of the specification, the terms "connection", "mounting", "fixing" and the like shall be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0207] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0208] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A helium injection assembly, the helium injection assembly being used for a battery cell, the battery cell including an electrode post, the electrode post having at least one mating surface and an injection port, the injection port being disposed on at least one of the mating surfaces, characterized in that, The helium injection assembly includes: The helium injection nozzle is provided with a helium injection channel, and both ends of the helium injection channel penetrate the outer wall of the helium injection nozzle along a first direction; Multiple sealing surfaces are provided on the helium injection nozzle, and the multiple sealing surfaces are located on the outer periphery of the helium injection channel; In this configuration, when the helium injection nozzle mates with the electrode post, the plurality of sealing surfaces abut against at least one mating surface, and the helium injection channel communicates with the injection port.

2. The helium injection assembly according to claim 1, wherein at least one of the mating surfaces includes a first mating surface, and the injection port is disposed on the first mating surface, characterized in that, Along the first direction, a plurality of sealing surfaces are disposed on the first side of the helium injection nozzle, and the plurality of sealing surfaces are arranged along the second direction. When the helium injection nozzle is engaged with the electrode post, the plurality of sealing surfaces abut against the first mating surface, and the second direction intersects the first direction.

3. The helium injection assembly according to claim 2, characterized in that, The first side of the helium injection nozzle is also provided with a groove, which is located between any two adjacent sealing surfaces. There are multiple grooves, which are arranged at intervals along the second direction. Along the first direction, the depth of the groove is h, where 1.2mm≤h≤1.65mm.

4. The helium injection assembly according to claim 2, characterized in that, The helium injection nozzle includes: ontology; An injection nozzle, along the first direction, is disposed on a first side of the body and a plurality of sealing surfaces, with the plurality of sealing surfaces located on the outer periphery of the injection nozzle; a portion of the helium injection channel is disposed on the body and another portion is disposed on the injection nozzle; Specifically, when the helium injection nozzle is engaged with the electrode post, the injection nozzle is inserted into the injection port.

5. The helium injection assembly according to claim 4, characterized in that, When the helium injection nozzle is fitted with the electrode, the outer wall of the injection nozzle is interference-fitted with the inner wall of the injection port.

6. The helium injection assembly according to claim 4, characterized in that, The injection nozzle is provided with a guide wall at one end away from the body, and at least a portion of the guide wall is constructed as an outwardly convex arc-shaped wall; The injection nozzle has a mating wall at one end near the body, and the mating wall is used to contact the inner wall of the injection port; At least a portion of the mating wall is constructed as an inwardly concave arc-shaped wall.

7. The helium injection assembly according to claim 4, characterized in that, The helium injection channel includes: A first channel is provided in the body, and one end of the first channel penetrates the outer wall of the body; A second channel, at least a portion of which is provided in the injection nozzle, one end of which is connected to the other end of the first channel, and the other end of which penetrates the outer wall of the injection nozzle; Along the second direction, the width of the second channel is smaller than the width of the first channel.

8. The helium injection assembly according to claim 2, characterized in that, At least one of the sealing surfaces has a width of n in the second direction, where n ≥ 0.6 mm; The side of the helium injection nozzle away from the plurality of sealing surfaces includes a first surface, and the distance between the plurality of sealing surfaces and the first surface in the first direction gradually decreases along the direction away from the helium injection channel; Among the plurality of sealing surfaces, at least two of the sealing surfaces are at different distances from the first surface in the first direction.

9. The helium injection assembly according to claim 8, characterized in that, The helium injection assembly also includes: A helium injection rod is located on the side of the helium injection nozzle that is away from the plurality of sealing surfaces; Multiple elastic elements are disposed on the helium injection rod and located between the helium injection rod and the helium injection nozzle, and along the first direction, the multiple elastic elements are respectively disposed opposite to the multiple sealing surfaces.

10. The helium injection assembly according to claim 1, wherein at least one of the mating surfaces includes a first mating surface and a second mating surface, and the injection port is disposed on the first mating surface, characterized in that, The plurality of sealing surfaces include a first sealing surface and a second sealing surface. When the helium injection nozzle is engaged with the electrode post, the first sealing surface abuts against the first mating surface, and the second sealing surface abuts against the second mating surface.

11. The helium injection assembly according to claim 10, wherein the electrode post is further provided with a mating groove, the bottom wall of the mating groove forming the first mating surface, characterized in that, When the helium injection nozzle mates with the electrode post, the injection port communicates with the mating groove, and the second mating surface is located on the outer periphery of the mating groove. The helium injection nozzle includes: ontology; An injection nozzle is provided along the first direction, and the injection nozzle and the second sealing surface are respectively provided on the first side of the body. The first sealing surface is provided on the side of the injection nozzle away from the body. A portion of the helium injection channel is provided on the body, and another portion is provided on the injection nozzle. Specifically, when the helium injection nozzle mates with the electrode post, the injection nozzle is located within the mating groove.

12. The helium injection assembly according to claim 11, characterized in that, When the helium injection nozzle is separated from the electrode, the length of the injection nozzle is greater than the depth of the mating groove along the first direction; The inner diameter of the first sealing surface is d1, wherein 0.5mm≤d1≤2mm; and / or the outer diameter of the first sealing surface is d2, wherein 3mm≤d2≤10mm; and / or the outer diameter of the second sealing surface is d3, wherein 10mm≤d3≤25mm.

13. The helium injection assembly according to claim 10, wherein the electrode post is further provided with a mating groove, the mating groove communicating with the injection port, the bottom wall of the mating groove forming a first mating surface, and the side wall of the mating groove forming a second mating surface, characterized in that, The bottom wall of the helium injection nozzle is formed as the first sealing surface, and the side wall of the helium injection nozzle is formed as the second sealing surface. When the helium injection nozzle is separated from the electrode post, the width of the helium injection nozzle is smaller than the width of the mating groove along the second direction, and the second direction intersects with the first direction.

14. The helium injection assembly according to claim 13, characterized in that, When the helium injection nozzle is separated from the electrode, the width of the helium injection nozzle in the second direction is L1; The width of the mating groove is L2, wherein 0.2mm ≤ (L2-L1) / 2 ≤ 2mm; and / or When the helium injection nozzle is matched with the electrode post, the width of the helium injection nozzle in the second direction is L3, wherein 0.5mm≤L3-L1≤5mm.

15. The helium injection assembly according to any one of claims 1 to 14, characterized in that, The hardness of the helium injection nozzle is greater than or equal to 25HA and less than or equal to 75HA. The helium injection nozzle includes a rubber component, which may be made of nitrile rubber, fluororubber, silicone rubber, or EPDM rubber.

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