Cover plate assembly and battery

Abstract

The present application relates to the technical field of batteries. Disclosed are a cover plate assembly and a battery. The cover plate assembly comprises: a cover plate provided with a liquid injection hole; and a conducting-blocking element comprising at least two support portions located on one side of a sealing portion in an axial direction, and an avoidance portion located between two adjacent support portions in a circumferential direction, wherein in a conducting state, the support portions abut against and fit with the inner wall of the liquid injection hole, and the avoidance portion is spaced apart from the inner wall of the liquid injection hole; in the conducting state, the area of each support portion that abuts against the inner wall of the liquid injection hole is defined as a pre-pressing abutting portion; and in the circumferential direction around the conducting-blocking element, the size of a contact area between the pre-pressing abutting portion and the inner wall of the liquid injection hole is defined as a pre-pressing width L, where L satisfies 0.2 mm≤L≤1.0 mm. The cover plate assembly provided in the present application can prevent the conducting-blocking element from popping upward due to insufficient friction generated in the area where the pre-pressing abutting portion abuts against the inner wall of the liquid injection hole; in addition, a sufficient exhaust channel is reserved to ensure the smooth progress of a helium leak detection process.

Description

Cover plate assembly and battery

[0001] Related Art Cross Reference

[0002] The present application claims priority to the Chinese patent application No. 202410705086.1, filed on June 3, 2024, and entitled "Cover plate assembly and battery", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a cover plate assembly and a battery. BACKGROUND

[0004] After the battery is injected with electrolyte, the electrolyte injection hole of the battery shell needs to be sealed. Before sealing, a certain amount of special gas such as helium is injected into the battery, so that after sealing, the sealing property of the battery can be detected by detecting whether there is gas leakage at the electrolyte injection hole of the battery.

[0005] Before helium detection, a sealing glue nail is often inserted into the electrolyte injection hole, and then negative pressure is drawn in the battery cell and helium is filled. In the related art, when the sealing glue nail is inserted into the electrolyte injection hole, if a sufficient exhaust passage is reserved, the friction between the sealing glue nail and the electrolyte injection hole is insufficient, and the glue nail may pop out. SUMMARY

[0006] Therefore, the present application provides a cover plate assembly and a battery to solve the problem that when a sufficient exhaust passage is reserved for helium detection of a battery cell, the friction between a sealing glue nail and an electrolyte injection hole is insufficient.

[0007] In a first aspect, the present application provides a cover plate assembly, comprising:

[0008] a cover plate, a liquid injection hole being formed in the cover plate;

[0009] a blocking element, having a sealing state of blocking the liquid injection hole, and a conducting state of at least partially extending into the liquid injection hole to make the liquid injection hole partially conductive;

[0010] the blocking element comprises a sealing portion, in the sealing state, the sealing portion is sealingly abutted against the inner wall of the liquid injection hole;

[0011] the blocking element further comprises at least two support portions located on one side of the sealing portion along the axial direction, and a avoiding portion located between the adjacent two support portions along the circumferential direction, in the conducting state, the support portions are abutted and matched with the inner wall of the liquid injection hole, and the avoiding portion is spaced apart from the inner wall of the liquid injection hole;

[0012] In the on state, the area where the supporting part abuts against the inner wall of the liquid injection hole is defined as a pre-pressing abutting part; along the circumferential direction of the through-plugging element, the size of the contact area between the pre-pressing abutting part and the inner wall of the liquid injection hole is a pre-pressing width L, wherein L satisfies 0.2mm≤L≤1.0mm.

[0013] Beneficial effects: By setting the lower limit of the pre-pressing width L, the insufficient friction generated by the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole can be avoided, so that the situation of the through-plugging element being popped up upward does not occur. By setting the upper limit of the pre-pressing width L, the situation that the supporting part occupies too much space and causes the exhaust passage to be too narrow can be avoided, so that a sufficient exhaust passage is reserved to ensure the smooth progress of the helium detection process; at the same time, setting the upper limit of the pre-pressing width L can also avoid the situation that the friction generated by the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole is too large, and the situation that the detection tool cannot successfully punch the through-plugging element into the liquid injection hole.

[0014] In an optional embodiment, along the circumferential direction of the through-plugging element, the circumferential size of one end of the supporting part connected to the sealing part is defined as d1, and the circumferential size of one end of the supporting part away from the sealing part is defined as d2, wherein d2>d1.

[0015] The pre-pressing width L satisfies: 1 / 2(d1+d2)·80%≤L≤1 / 2(d1+d2)·120%.

[0016] Beneficial effects: When the detection tool presses the through-plugging element into the liquid injection hole, the contact area between the through-plugging element and the inner wall of the liquid injection hole can be optionally located at the middle position of the supporting part, that is, the size of the pre-pressing width L is: the size of the middle position of the supporting part along the circumferential direction of the through-plugging element, that is: 1 / 2(d1+d2)·80%≤L≤1 / 2(d1+d2)·120%.

[0017] In an optional embodiment, along the radial direction, the outer edge of the supporting part is flush with the outer edge of the sealing part.

[0018] The pre-pressing width L also satisfies: 1 / 120πC≤L≤1 / 6πC; wherein C is the diameter of the sealing part along the radial direction.

[0019] Beneficial effects: By making the pre-pressing width L satisfy 1 / 120πC≤L≤1 / 6πC; wherein C is the diameter of the sealing portion in the radial direction, thereby limiting the proportion of the pre-pressing width L in the whole circle, by making 1 / 120πC≤L, it can be ensured that the pre-pressing width L has sufficient proportion, avoiding the insufficient friction force generated in the area where the pre-pressing abutting portion abuts against the inner wall of the liquid injection hole, leading to the situation that the through-plugging element pops out upward. By making L≤1 / 6πC, it can avoid that the pre-pressing width L has too large proportion in the whole circle, avoiding that the supporting portion occupies too large space, leading to the situation that the exhaust passage is too narrow, thereby reserving sufficient exhaust passage and ensuring the smooth progress of the helium detection process; at the same time, setting the upper limit of the pre-pressing width L to be less than or equal to 1 / 6πC can also avoid that the friction force generated in the area where the pre-pressing abutting portion abuts against the inner wall of the liquid injection hole is too large, avoiding the situation that the detection tool cannot smoothly press the through-plugging element into the liquid injection hole.

[0020] In an optional embodiment, the circumferential dimension of the supporting portion gradually increases from the sealing portion to the direction away from the axis of the sealing portion, and the growth amount of the supporting portion satisfies: 1 / 6d1≤d2-d1≤1 / 2d1.

[0021] Beneficial effects: The circumferential dimension of the supporting portion gradually increases from the sealing portion to the direction away from the axis of the sealing portion, that is, the circumferential dimension of the supporting portion gradually increases in the direction of the through-plugging element being loaded into the liquid injection hole, and correspondingly, if the through-plugging element pops out outward under the action of the elastic force after the through-plugging element is pressed into the liquid injection hole, the area of the region where the supporting portion abuts against the inner wall of the liquid injection hole will gradually increase, thereby further limiting the pop-out of the through-plugging element and improving the assembly reliability of the through-plugging element and the liquid injection hole. By further limiting the growth amount of the supporting portion to satisfy: 1 / 6d1≤d2-d1≤1 / 2d1, by setting 1 / 6d1≤d2-d1, it can be ensured that the circumferential dimension of the supporting portion is in a gradually increasing state, effectively preventing the through-plugging element from popping out outward under the action of the elastic force. And by setting d2-d1≤1 / 2d1, it can avoid that the circumferential dimension of the supporting portion away from the sealing portion is too large, leading to the situation that the exhaust passage is too narrow, thereby reserving sufficient exhaust passage and ensuring the smooth progress of the helium detection process.

[0022] In an optional embodiment, the through-plugging element is extrusion formed; a preparation pressing portion and a preparation reserved portion are formed on the end face of the through-plugging element away from the supporting portion, and the preparation pressing portion is annularly arranged on the outer circumferential side of the preparation reserved portion.

[0023] The preparation pressing portion is adapted to abut against the extrusion forming equipment, and the preparation reserved portion has no contact with the extrusion forming equipment.

[0024] Beneficial effects: The preparation pressing part and the preparation reserved part are formed on the end face of the through-plugging element away from the support part. During the extrusion molding process, the extrusion molding equipment abuts against and presses the preparation pressing part, while the preparation reserved part is not in contact with the extrusion molding equipment, so that the excess waste of the through-plugging element can be concentrated to the preparation reserved part area. Since the preparation reserved part is not in direct contact with the liquid injection hole, the burrs or flash formed in this area will not affect the subsequent sealing effect. Therefore, the processing is facilitated, and the manufacturing yield is improved.

[0025] In an optional embodiment, the diameter D of the preparation reserved part in the radial direction satisfies: 0.3mm≤D≤2.3mm.

[0026] Beneficial effects: By limiting the lower limit of the diameter D of the preparation reserved part in the radial direction, it can be avoided that the excess waste cannot be fully concentrated to the preparation reserved part, and the burrs formed on the circumferential edge of the through-plugging element are reduced, so that during the nailing and feeding process, the burrs on the circumferential edge of the through-plugging element will not cause the through-plugging element to be skewed due to scratching the cavity wall of the conveying equipment, and the success rate of nailing and feeding is improved. By limiting the upper limit of the diameter D of the preparation reserved part in the radial direction, it can be avoided that the area of the preparation pressing part is small due to the diameter D of the preparation reserved part in the radial direction being too large, and the area of the contact area between the extrusion molding equipment and the preparation pressing part is ensured during the extrusion molding process, so that the excess waste cannot be fully concentrated to the preparation reserved part, and the burrs formed on the circumferential edge of the through-plugging element are reduced, so that during the nailing and feeding process, the burrs on the circumferential edge of the through-plugging element will not cause the through-plugging element to be skewed due to scratching the cavity wall of the conveying equipment, and the success rate of nailing and feeding is improved.

[0027] In an optional embodiment, along the circumferential direction around the through-plugging element, the area where the support part and the avoiding part are in contact forms an R-angle or chamfered transition.

[0028] Beneficial effects: By forming an R-angle or chamfered transition in the area where the support part and the avoiding part are in contact, the manufacturability and assembly of the product can be improved, the production and manufacturing are facilitated, the installation of the through-plugging element and the liquid injection hole is facilitated, the corners are smoother, and the jamming during assembly is avoided.

[0029] In an optional embodiment, the through-plugging element further comprises a guide part connected to one end of the support part away from the sealing part; the guide part gradually decreases in diameter in the direction away from the support part.

[0030] Beneficial effects: By providing the guide part at one end of the support part away from the sealing part, the guide part can play a guiding role when the through-plugging element is installed in the liquid injection hole, and the assembly smoothness is improved.

[0031] In an optional embodiment, the material of the through-plugging element includes fluororubber or ethylene propylene diene rubber (EPDM).

[0032] Beneficial effects: the elastic material can improve the sealing effect of the blocking element and the liquid injection hole, ensure good sealing, and facilitate the processing and manufacturing of the blocking element.

[0033] In a second aspect, the application further provides a battery comprising the cover plate assembly as described above.

[0034] Because the battery comprises the cover plate assembly, it has the same effects as the cover plate assembly, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0036] Fig. 1 is a perspective view of the blocking element of the application;

[0037] Fig. 2 is a front view of the blocking element of the application;

[0038] Fig. 3 is a bottom view of the blocking element of the application;

[0039] Fig. 4 is a schematic view of the blocking element of the application and the cover plate in a conductive state;

[0040] Fig. 5 is a schematic view of the blocking element of the application and the cover plate in a sealed state;

[0041] Reference signs: 10, blocking element; 1, sealing part; 2, supporting part; 3, avoiding part; 4, preparation reserved part; 5, preparation pressing part; 6, guiding part; 7, transition part; 20, cover plate; 21, liquid injection hole; 30, exhaust passage. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the technical solutions in the embodiments of the application will be described clearly and completely below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0046] The embodiments of the present application will be described below in conjunction with FIGS. 1-5.

[0047] According to the embodiments of the present application, in one aspect, a cover plate assembly is provided, comprising:

[0048] A cover plate 20, a liquid injection hole 21 is formed on the cover plate 20;

[0049] A plugging element 10, having a sealing state of plugging the liquid injection hole 21, and a conductive state of at least partially extending into the liquid injection hole 21 to make the liquid injection hole 21 partially conductive;

[0050] The plugging element 10 comprises a sealing part 1, in the sealing state, the sealing part 1 is sealingly abutted with the inner wall of the liquid injection hole 21;

[0051] The plugging element 10 further comprises at least two support parts 2 located on one side of the sealing part 1 along the axial direction, and an avoiding part 3 located between the adjacent two support parts 2 along the circumferential direction, in the conductive state, the support part 2 is abutted and matched with the inner wall of the liquid injection hole 21, and the avoiding part 3 is spaced from the inner wall of the liquid injection hole 21;

[0052] In the conductive state, the area where the support part 2 abuts with the inner wall of the liquid injection hole 21 is defined as a pre-pressing abutting part; along the circumferential direction around the plugging element 10, the size of the contact area between the pre-pressing abutting part and the inner wall of the liquid injection hole 21 is a pre-pressing width L, wherein L satisfies 0.2mm≤L≤1.0mm.

[0053] As shown in FIG. 4 and FIG. 5, the through-plugging element 10 is adapted to be inserted into the liquid injection hole 21 along the axial direction. After the battery is injected with electrolyte, the liquid injection hole of the battery shell needs to be sealed. When the sealing part 1 is tightly sealed against the inner wall of the liquid injection hole 21, the liquid injection hole 21 is completely sealed, thereby preventing the electrolyte inside the battery shell from flowing out. Before sealing, a certain amount of helium needs to be injected into the battery to detect the sealing performance of the battery.

[0054] In this embodiment, the through-plugging element 10 is designed to be segmented along the axial direction, which is not only suitable for sealing the liquid injection hole 21, but also suitable for forming an exhaust passage 30 during the helium detection stage.

[0055] By inserting the through-plugging element 10 at least partially into the liquid injection hole 21, the liquid injection hole 21 is not in a completely sealed state. At this time, the support part 2 of the through-plugging element 10 located on one side of the sealing part 1 along the axial direction is tightly fitted against the inner wall of the liquid injection hole 21. Since the avoiding part 3 is formed between the two adjacent support parts 2 along the circumferential direction, the avoiding part 3 is spaced apart from the inner wall of the liquid injection hole 21 when the support part 2 is tightly fitted against the inner wall of the liquid injection hole 21. Thus, the exhaust passage 30 is formed, which realizes the internal and external communication of the cover plate 20, thereby facilitating the injection of a certain amount of helium into the battery to detect the sealing performance of the battery.

[0056] Since the through-plugging element 10 needs to be pressed into the liquid injection hole 21 by a detection tool when detecting the sealing performance of the battery, the through-plugging element 10 is an elastic element, which has a certain upward elastic force after being pressed into the liquid injection hole 21. Therefore, the friction force generated in the area where the support part 2 is in abutment with the inner wall of the liquid injection hole 21 needs to be greater than the upward elastic force of the through-plugging element 10 after being pressed, so as to avoid the upward rebound of the through-plugging element 10.

[0057] In this embodiment, the area where the support part 2 is in abutment with the inner wall of the liquid injection hole 21 is defined as a pre-pressing abutment part. Along the circumferential direction around the through-plugging element 10, the size of the contact area between the pre-pressing abutment part and the inner wall of the liquid injection hole 21 is a pre-pressing width L, which needs to satisfy 0.2mm≤L≤1.0mm.

[0058] As an optional embodiment, the specific value of the pre-pressing width L can be 0.2mm or 0.3mm or 0.5mm or 0.6mm or 0.8mm or 1mm, etc.

[0059] By setting the lower limit of the pre-pressing width L, the friction force generated in the area where the pre-pressing abutment part is in abutment with the inner wall of the liquid injection hole 21 can be avoided to be insufficient, thereby preventing the upward rebound of the through-plugging element 10.

[0060] By setting the upper limit of the pre-pressing width L, the space occupied by the support part 2 is prevented from being too large, so that the exhaust passage 30 is not too narrow, and the helium detection process can be carried out smoothly. At the same time, setting the upper limit of the pre-pressing width L can also prevent the friction force generated in the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole 21 from being too large, and prevent the detection tool from being unable to smoothly punch the plugging element 10 into the liquid injection hole 21.

[0061] In the present embodiment, the plugging element 10 is formed with three support parts 2, and an avoiding part 3 is formed between every two adjacent support parts 2. The avoiding part 3 can be a prismatic surface.

[0062] In some embodiments, as shown in FIG. 4, the circumferential dimension of the end of the support part 2 connected to the sealing part 1 is defined as d1, and the circumferential dimension of the end of the support part 2 away from the sealing part 1 is defined as d2, wherein d2>d1.

[0063] The pre-pressing width L satisfies: 1 / 2(d1+d2)·80%≤L≤1 / 2(d1+d2)·120%.

[0064] In the present embodiment, when the detection tool presses the plugging element 10 into the liquid injection hole 21, the contact area between the plugging element 10 and the inner wall of the liquid injection hole 21 is preferably located in the middle part of the support part 2, that is, the size of the pre-pressing width L is: the size of the middle part of the support part 2 along the circumferential direction of the plugging element 10, that is: 1 / 2(d1+d2)·80%≤L≤1 / 2(d1+d2)·120%.

[0065] When the pre-pressing width L exceeds the upper limit of 1 / 2(d1+d2)·120%, the detection tool presses the plugging element 10 into the liquid injection hole 21 too shallowly, and the space occupied by the support part 2 is too large, which can easily cause the exhaust passage 30 to be too narrow, affecting the smooth progress of the helium detection process. When the pre-pressing width L exceeds the lower limit of 1 / 2(d1+d2)·80%, the detection tool presses the plugging element 10 into the liquid injection hole 21 too deeply, and the friction force generated in the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole 21 is insufficient, which can cause the plugging element 10 to easily displace along the axial direction, interfering with the normal progress of the helium detection process.

[0066] Preferably, the pre-pressing width L is selected as L=1 / 2(d1+d2).

[0067] In combination with Table 1 below, the actual use effects of the cover plate assembly of the present application under different parameters are compared through several embodiments and comparative examples. Each group of embodiments or comparative examples is produced by punching more than 50 plugging elements 10, and the assembly pre-pressing yield is calculated by counting the assembly pre-pressing results of each group of embodiments or comparative examples.

[0068] Table 1

[0069] In Example 1, d1 = 0.17 mm, d2 = 0.23 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by a detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the support part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.2 mm, and the assembly pre-pressing result is recorded; more than 50 of the same type of through-plugging element 10 are produced by trial production, the experimental steps are repeated, and the assembly pre-pressing results are summarized to obtain an assembly pre-pressing yield of 99.9%, which can meet the actual demand.

[0070] In Example 2, d1 = 0.24 mm, d2 = 0.37 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by a detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the support part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.305 mm, and the assembly pre-pressing result is recorded; more than 50 of the same type of through-plugging element 10 are produced by trial production, the experimental steps are repeated, and the assembly pre-pressing results are summarized to obtain an assembly pre-pressing yield of 99.3%, which can meet the actual demand.

[0071] In Example 3, d1 = 0.37 mm, d2 = 0.48 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by a detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the support part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.425 mm, and the assembly pre-pressing result is recorded; more than 50 of the same type of through-plugging element 10 are produced by trial production, the experimental steps are repeated, and the assembly pre-pressing results are summarized to obtain an assembly pre-pressing yield of 98.2%, which can meet the actual demand.

[0072] In Example 4, d1 = 0.47 mm, d2 = 0.58 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by a detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the support part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.525 mm, and the assembly pre-pressing result is recorded; more than 50 of the same type of through-plugging element 10 are produced by trial production, the experimental steps are repeated, and the assembly pre-pressing results are summarized to obtain an assembly pre-pressing yield of 99.9%, which can meet the actual demand.

[0073] In the embodiment 5, d1=0.57mm, d2=0.73mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L=1 / 2(d1+d2)=0.65mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by sample printing, the experimental steps are repeated, the assembly pre-pressing results are summarized, and the assembly pre-pressing yield is 99.8%, which can meet the actual demand.

[0074] In the embodiment 6, d1=0.62mm, d2=0.79mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L=1 / 2(d1+d2)=0.705mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by sample printing, the experimental steps are repeated, the assembly pre-pressing results are summarized, and the assembly pre-pressing yield is 99.1%, which can meet the actual demand.

[0075] In the embodiment 7, d1=0.79mm, d2=0.98mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L=1 / 2(d1+d2)=0.885mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by sample printing, the experimental steps are repeated, the assembly pre-pressing results are summarized, and the assembly pre-pressing yield is 99%, which can meet the actual demand.

[0076] In the embodiment 8, d1=0.92mm, d2=1.08mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L=1 / 2(d1+d2)=1mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by sample printing, the experimental steps are repeated, the assembly pre-pressing results are summarized, and the assembly pre-pressing yield is 82.1%, which is generally good and can meet the actual demand to some extent.

[0077] In addition, in combination with the embodiments 1' to 8', when the pre-pressing width L is in the range of 1 / 2(d1+d2)·80%≤L≤1 / 2(d1+d2)·120%, the assembly pre-pressing yield can also meet the demand through experimental verification.

[0078] In the comparative example 1, d1 = 0.14 mm, d2 = 0.2 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.17 mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by trial production, the experimental steps are repeated, the assembly pre-pressing results are summarized, and it is found that the assembly pre-pressing yield is only 25.1%. Since the pre-pressing width size is small, the through-plugging element 10 pops up after being punched into the liquid injection hole 21 due to insufficient friction, resulting in a low yield, which cannot meet the actual demand.

[0079] In the comparative example 2, d1 = 0.16 mm, d2 = 0.22 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the contact area between the through-plugging element 10 and the inner wall of the liquid injection hole 21 is in the middle position of the supporting part 2, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 0.19 mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by trial production, the experimental steps are repeated, the assembly pre-pressing results are summarized, and it is found that the assembly pre-pressing yield is only 33.3%. Since the pre-pressing width size is small, the through-plugging element 10 pops up after being punched into the liquid injection hole 21 due to insufficient friction, resulting in a low yield, which cannot meet the actual demand.

[0080] In the comparative example 3, d1 = 1.02 mm, d2 = 1.1 mm, the through-plugging element 10 is pressed into the liquid injection hole 21 by the detection tool, and the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 1.06 mm, and the assembly pre-pressing result is recorded; more than 50 of the through-plugging element 10 of this type are produced by trial production, the experimental steps are repeated, the assembly pre-pressing results are summarized, and it is found that the assembly pre-pressing yield is only 32%. Since the detection tool needs to set a reasonable pressing force upper limit when pressing the through-plugging element 10 into the liquid injection hole 21, to avoid the situation that the pressing force is too large to cause the through-plugging element 10 to be deformed or the cover plate or the pole group to be damaged; in this comparative example, since the pre-pressing width size is too large, the friction is too large, a certain number of through-plugging elements 10 cannot be smoothly punched into the liquid injection hole 21, resulting in assembly failure, a low yield, and cannot meet the actual demand.

[0081] In Comparative Example 4, d1 = 1.24 mm, d2 = 1.32 mm, the through-plugging element 10 is pressed into the injection hole 21 by a detection tool, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 1.28 mm, and the pre-pressing result is recorded. More than 50 through-plugging elements 10 of this type are produced by trial production, the experimental steps are repeated, and the pre-pressing results are summarized to obtain a pre-pressing yield of only 13%. When the detection tool presses the through-plugging element 10 into the injection hole 21, a reasonable upper limit of the pressing force needs to be set to avoid excessive pressing force causing deformation of the through-plugging element 10 or damage to the cover plate or the pole group. In this comparative example, the pre-pressing width is too large, resulting in excessive friction, and a certain number of through-plugging elements 10 cannot be smoothly punched into the injection hole 21, resulting in assembly failure and low yield, which cannot meet the actual demand.

[0082] In Comparative Example 5, d1 = 1.98 mm, d2 = 2.36 mm, the through-plugging element 10 is pressed into the injection hole 21 by a detection tool, the corresponding pre-pressing width is L = 1 / 2(d1+d2) = 2.17 mm, and the pre-pressing result is recorded. More than 50 through-plugging elements 10 of this type are produced by trial production, the experimental steps are repeated, and the pre-pressing results are summarized to obtain a pre-pressing yield of 0%. When the detection tool presses the through-plugging element 10 into the injection hole 21, a reasonable upper limit of the pressing force needs to be set to avoid excessive pressing force causing deformation of the through-plugging element 10 or damage to the cover plate or the pole group. In this comparative example, the pre-pressing width is too large, resulting in excessive friction, and all the number of through-plugging elements 10 cannot be smoothly punched into the injection hole 21, resulting in assembly failure, which cannot meet the actual demand.

[0083] In some embodiments, as shown in FIG. 1, in the radial direction, the outer edge of the support part 2 is flush with the outer edge of the sealing part 1.

[0084] The pre-pressing width L also satisfies: 1 / 120πC≤L≤1 / 6πC; wherein C is the diameter of the sealing part 1 in the radial direction.

[0085] Since the outer edge of the support part 2 is flush with the outer edge of the sealing part 1 in the radial direction, the projection of the outer edge of the support part 2 and the outer edge of the sealing part 1 in the axial direction overlaps.

[0086] Therefore, the circumference of the outer edge of the sealing part 1 can represent the circumference of a circle that is tangent to the outer edges of the plurality of support parts 2 at the same time.

[0087] By making the pre-pressing width L satisfy 1 / 120πC≤L≤1 / 6πC; wherein C is the diameter of the sealing part 1 in the radial direction, thereby limiting the proportion of the pre-pressing width L in the whole circle, by making 1 / 120πC≤L, it can be ensured that the pre-pressing width L has sufficient proportion, avoiding the case that the friction generated by the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole 21 is insufficient, leading to the case that the through-plugging element 10 pops out upward. By making L≤1 / 6πC, it can be avoided that the proportion of the pre-pressing width L in the whole circle is too large, avoiding the case that the space occupied by the supporting part 2 is too large, leading to the case that the exhaust passage 30 is too narrow, thereby reserving sufficient exhaust passage and ensuring the smooth progress of the helium detection process; at the same time, setting the upper limit of the pre-pressing width L to be less than or equal to 1 / 6πC can also avoid the case that the friction generated by the area where the pre-pressing abutting part abuts against the inner wall of the liquid injection hole 21 is too large, avoiding the case that the detection tool cannot smoothly press the through-plugging element 10 into the liquid injection hole 21.

[0088] In some embodiments, as shown in FIG. 2, the circumferential dimension of the supporting part 2 gradually increases away from the axis of the sealing part 1, and the growth amount of the supporting part 2 satisfies: 1 / 6d1≤d2-d1≤1 / 2d1.

[0089] The circumferential dimension of the supporting part 2 gradually increases away from the axis of the sealing part 1, that is, the circumferential dimension of the supporting part 2 gradually increases in the direction of the through-plugging element 10 being fitted into the liquid injection hole 21. Correspondingly, after the through-plugging element 10 is pressed into the liquid injection hole 21, if the through-plugging element 10 pops out outward under the action of the elastic force, the area of the region where the supporting part 2 abuts against the inner wall of the liquid injection hole 21 will gradually increase, thereby further limiting the popping out of the through-plugging element 10 and improving the assembly reliability of the through-plugging element 10 and the liquid injection hole 21.

[0090] The present embodiment further limits the growth amount of the supporting part 2 to satisfy: 1 / 6d1≤d2-d1≤1 / 2d1. By setting 1 / 6d1≤d2-d1, it can be ensured that the circumferential dimension of the supporting part 2 is in a gradually increasing state, effectively preventing the through-plugging element 10 from popping out outward under the action of the elastic force. And by setting d2-d1≤1 / 2d1, it can be avoided that the circumferential dimension of the supporting part 2 away from the sealing part 1 is too large, leading to the case that the exhaust passage 30 is too narrow, thereby reserving sufficient exhaust passage and ensuring the smooth progress of the helium detection process.

[0091] In some embodiments, as shown in FIG. 1, the through-plugging element 10 is extrusion formed; the through-plugging element 10 is formed with a preparation pressing part 5 and a preparation reserved part 4 at the end face away from the supporting part 2; the preparation pressing part 5 is annularly arranged on the outer circumferential side of the preparation reserved part 4.

[0092] The preparation pressing part 5 is adapted to abut against the extrusion forming equipment, and the preparation reserved part 4 has no contact with the extrusion forming equipment.

[0093] In this embodiment, the plugging element 10 is made of elastic material, and in the specific preparation process, extrusion molding is adopted. In order to prevent the formation of burrs and flash after the plugging element 10 is demolded, especially to avoid the existence of burrs or flash on the circumferential edge of the sealing part 1 affecting the smoothness of subsequent nailing and feeding and the sealing effect, the plugging element 10 of this embodiment is formed with a preparation pressing part 5 and a preparation reserved part 4 at the end face away from the supporting part 2. In the extrusion molding process, the extrusion molding equipment abuts against and presses the preparation pressing part 5, while the preparation reserved part 4 has no contact with the extrusion molding equipment, so that the excess waste of the plugging element 10 can be concentrated in the preparation reserved part 4 area. Since the preparation reserved part 4 has no direct contact with the liquid injection hole 21, the burrs or flash formed in this area will not affect the subsequent sealing effect; thereby facilitating processing and improving manufacturing yield.

[0094] Optionally, the preparation reserved part 4 will form a generally convex form after extrusion molding.

[0095] In some embodiments, in combination with FIG. 1, the diameter D of the preparation reserved part 4 in the radial direction satisfies: 0.3mm≤D≤2.3mm.

[0096] As an optional embodiment, the specific value of the diameter D of the preparation reserved part 4 in the radial direction can be: 0.3mm or 0.5mm or 0.6mm or 0.8mm or 1mm or 1.3mm or 1.5mm or 1.8mm or 2mm or 2.3mm, etc.

[0097] In combination with Table 2 below, the actual use effect of the plugging element 10 of the present application under different diameters D of the preparation reserved part 4 in the radial direction is compared through several embodiments and comparative examples.

[0098] It should be noted that in actual continuous production, the plugging element 10 needs to be transported in sequence by the conveying equipment. When the burr size of the circumferential edge of the plugging element 10 is too large, it is easy to scratch the cavity wall of the conveying equipment, causing the plugging element 10 to be skewed, and thus easily leading to nailing and feeding failure. Only when the burr size is small enough to smoothly pass through the cavity wall of the conveying equipment, the plugging element 10 will not be skewed, thereby ensuring successful nailing and feeding. The actual measured burr size described in Table 2 refers to the burr size of the circumferential edge of the plugging element 10 that is easy to scratch the cavity wall of the conveying equipment; it is not the burr size in the preparation reserved part 4 area.

[0099] Table 2

[0100] In the sample No. 1, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.15 mm. At this time, because the diameter D of the preparation reserved part 4 in the radial direction is too small, the excess waste material cannot be fully concentrated to the preparation reserved part 4, and burrs are easily formed at the circumferential edge of the through-plugging element 10. The measured burr size is 0.23 mm. During the nail feeding process, the burrs at the circumferential edge of the through-plugging element 10 scratch the cavity wall of the conveying equipment, causing the through-plugging element 10 to be skewed, and resulting in the failure of nail feeding.

[0101] In the sample No. 2, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.23 mm. At this time, because the diameter D of the preparation reserved part 4 in the radial direction is too small, the excess waste material cannot be fully concentrated to the preparation reserved part 4, and burrs are easily formed at the circumferential edge of the through-plugging element 10. The measured burr size is 0.21 mm. During the nail feeding process, the burrs at the circumferential edge of the through-plugging element 10 scratch the cavity wall of the conveying equipment, causing the through-plugging element 10 to be skewed, and resulting in the failure of nail feeding.

[0102] In the sample No. 3, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.28 mm. At this time, because the diameter D of the preparation reserved part 4 in the radial direction is too small, the excess waste material cannot be fully concentrated to the preparation reserved part 4, and burrs are easily formed at the circumferential edge of the through-plugging element 10. The measured burr size is 0.17 mm. During the nail feeding process, the burrs at the circumferential edge of the through-plugging element 10 scratch the cavity wall of the conveying equipment, causing the through-plugging element 10 to be skewed, and resulting in the failure of nail feeding.

[0103] In the sample No. 4, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.3 mm. At this time, because the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.15 mm. During the nail feeding process, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, the through-plugging element 10 is aligned with the liquid injection hole 21 to achieve smooth nail feeding, and the nail feeding is successful.

[0104] In the sample No. 5, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.35 mm. At this time, because the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.15 mm. During the nail feeding process, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, the through-plugging element 10 is aligned with the liquid injection hole 21 to achieve smooth nail feeding, and the nail feeding is successful.

[0105] In the sample No. 6, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.72 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.12 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 is successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0106] In the sample No. 7, the diameter D of the preparation reserved part 4 in the radial direction is set to 0.96 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.12 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 is successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0107] In the sample No. 8, the diameter D of the preparation reserved part 4 in the radial direction is set to 1.28 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.11 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 is successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0108] In the sample No. 9, the diameter D of the preparation reserved part 4 in the radial direction is set to 1.53 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.11 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 is successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0109] In the sample No. 10, the diameter D of the preparation reserved part 4 in the radial direction is set to 1.76 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.12 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 is successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0110] In the sample No. 11, the diameter D of the preparation reserved part 4 in the radial direction is set to 1.97 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.12 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 can be successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0111] In the sample No. 12, the diameter D of the preparation reserved part 4 in the radial direction is set to 2.15 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.13 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 can be successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0112] In the sample No. 13, the diameter D of the preparation reserved part 4 in the radial direction is set to 2.25 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.15 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 can be successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0113] In the sample No. 14, the diameter D of the preparation reserved part 4 in the radial direction is set to 2.3 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is moderate, the excess waste material can be concentrated to the preparation reserved part 4, and the burr size formed at the circumferential edge of the through-plugging element 10 is only 0.15 mm. In the process of nailing and feeding, the through-plugging element 10 can smoothly pass through the cavity wall of the conveying equipment, and the through-plugging element 10 can be successfully nailed to the liquid injection hole 21, and the nailing and feeding is successful.

[0114] In the sample No. 15, the diameter D of the preparation reserved part 4 in the radial direction is set to 2.3 mm. At this time, since the diameter D of the preparation reserved part 4 in the radial direction is too large, and the overall diameter of the through-plugging element 10 is fixed, that is, the diameter of the sealing part 1 in the radial direction is fixed, the area of the preparation pressing part 5 is small. In the process of extrusion molding, the contact area between the extrusion molding equipment and the preparation pressing part 5 becomes smaller, so that the excess waste material cannot be completely concentrated to the preparation reserved part 4, and the burr is easily formed at the circumferential edge of the through-plugging element 10. The measured burr size is 0.18 mm. In the process of nailing and feeding, the burr at the circumferential edge of the through-plugging element 10 scratches the cavity wall of the conveying equipment, causing the through-plugging element 10 to be skewed, resulting in the failure of nailing and feeding.

[0115] In the sample No. 16, the diameter D of the preparation reserved part 4 in the radial direction is set to 3.0 mm. At this time, due to the excessive diameter D of the preparation reserved part 4 in the radial direction, the overall diameter of the plugging element 10 is fixed, that is, the diameter of the sealing part 1 in the radial direction is fixed, which leads to a small area of the preparation pressing part 5. In the extrusion molding process, the contact area of the extrusion molding equipment and the preparation pressing part 5 is small, which causes that the excess waste material cannot be fully concentrated to the preparation reserved part 4, and burrs are easily formed on the circumferential edge of the plugging element 10. The measured burr size is 0.2 mm. In the nailing feeding process, the burrs on the circumferential edge of the plugging element 10 scratch the cavity wall of the conveying equipment, which causes the plugging element 10 to be skewed, resulting in failure of nailing feeding.

[0116] Through experiments, the diameter D of the preparation reserved part 4 in the radial direction is selected as follows: 0.3 mm≤D≤2.3 mm. By limiting the lower limit of the diameter D of the preparation reserved part 4 in the radial direction, the situation that the excess waste material cannot be fully concentrated to the preparation reserved part 4 can be avoided, and the burrs on the circumferential edge of the plugging element 10 are reduced, so that in the nailing feeding process, the burrs on the circumferential edge of the plugging element 10 will not cause the plugging element 10 to be skewed due to scratching the cavity wall of the conveying equipment, and the success rate of nailing feeding is improved. By limiting the upper limit of the diameter D of the preparation reserved part 4 in the radial direction, the situation that the area of the preparation pressing part 5 is small due to the excessive diameter D of the preparation reserved part 4 in the radial direction can be avoided, and the area of the contact area of the extrusion molding equipment and the preparation pressing part 5 is ensured in the extrusion molding process, which avoids the situation that the excess waste material cannot be fully concentrated to the preparation reserved part 4, and reduces the burrs on the circumferential edge of the plugging element 10, so that in the nailing feeding process, the burrs on the circumferential edge of the plugging element 10 will not cause the plugging element 10 to be skewed due to scratching the cavity wall of the conveying equipment, and the success rate of nailing feeding is improved.

[0117] In some embodiments, as shown in FIG. 1, along the circumferential direction around the plugging element 10, the area where the support part 2 and the avoiding part 3 contact forms an R angle or a chamfered transition part 7.

[0118] By forming the R angle or chamfered transition part 7 at the area where the support part 2 and the avoiding part 3 contact, the product manufacturability and assembly can be improved, which is convenient for production and manufacturing, and also facilitates the installation of the plugging element 10 and the liquid injection hole 21, makes the corners more smooth, and avoids jamming in the assembly process.

[0119] In some embodiments, as shown in FIG. 1, the plugging element 10 further comprises a guide part 6 connected to one end of the support part 2 away from the sealing part 1; the guide part 6 gradually decreases in diameter in the direction away from the support part 2.

[0120] The guide part 6 is arranged at the end of the supporting part 2 away from the sealing part 1, so that the guide part 6 can play a guiding role when the through-plugging element 10 is assembled into the liquid injection hole 21, and the assembly is smooth.

[0121] In some embodiments, the material of the through-plugging element 10 includes fluoroelastomer or ethylene propylene diene rubber (EPDM).

[0122] The elastic material can improve the sealing effect of the through-plugging element 10 and the liquid injection hole 21, ensure good sealing performance, and facilitate the processing and manufacturing of the through-plugging element 10.

[0123] According to the embodiments of the present application, in another aspect, a battery is also provided, which includes the cover plate assembly as described above.

[0124] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the present application.

Claims

1. A cover assembly, characterized by The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device.

2. The cover plate assembly of claim 1, wherein, The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device.

3. The cover plate assembly of claim 2, wherein, The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device.

4. The cover plate assembly of claim 2, wherein, The application relates to a liquid injection hole sealing and opening device.

5. The cover plate assembly of any one of claims 1 to 4, wherein, The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device.

6. The cover plate assembly of claim 5, wherein, The application relates to a liquid injection hole sealing and opening device.

7. The cover plate assembly of any one of claims 1 to 4, wherein, The application relates to a liquid injection hole sealing and opening device.

8. The cover plate assembly of any one of claims 1 to 4, wherein, The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. The application relates to a liquid injection hole sealing and opening device. 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The cover plate assembly of any one of claims 1 to 4, wherein, The material of the unblocking element (10) comprises fluoroelastomer or ethylene propylene diene rubber (EPDM).

10. A battery, characterized by A cover assembly comprising any one of the above claims 1 to 9.

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