Battery and sealing rubber nail thereof

Abstract

The utility model relates to a battery and a sealing rubber nail thereof. The sealing rubber nail of the battery comprises a deformation column and an expansion thread assembly. The battery comprises a cover plate and a sealing rubber nail of the battery. The cover plate is provided with a liquid injection hole, and a sealing glue nail of the battery is used for being inserted into the liquid injection hole. Through clearance fit between the outer wall of the deformation column and the inner wall of the liquid injection hole and expansion of the expansion thread assembly, the state of the sealing glue nail of the battery and the inner wall of the liquid injection hole can be accurately controlled, and injection of helium and good sealing after helium injection are guaranteed; and water is prevented from being mixed into the liquid injection hole in the subsequent process or safety risks generated in the welding process of a sealing rubber nail of the battery are avoided.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery structural components, in particular to batteries and their sealing glue nails. Background Art

[0002] After the secondary liquid injection in the cell manufacturing process of the square shell battery, the following steps are carried out: inserting the sealing glue nail → evacuating → injecting helium → inserting the sealing glue nail. Refer to Figure 1 and Figure 2 , when the existing sealing glue nail 10 makes the first downward insertion movement, it only keeps a certain distance between the mating surface of the sealing glue nail 10 and the liquid injection hole 211, and uses the oblique notch in its front guiding section to form a channel for evacuating and injecting helium. After injecting helium, a secondary nail insertion movement is carried out to make the mating section and the liquid injection hole of the cover plate in an interference fit to achieve a sealing effect and test the sealing performance. After inserting the sealing glue nail, it flows into the next station for welding the sealing aluminum nail to complete the full sealing of the square shell cell.

[0003] However, after evacuating, a negative pressure is formed inside the cell, which will further tighten the sealing glue nail, making it difficult to control the semi-inserted state of the sealing glue nail, and difficult to inject helium. In the case of testing the sealing performance by returning helium, it creates an illusion of good sealing, resulting in easy mixing of moisture in subsequent processes or generating safety risks during the subsequent sealing nail welding process. Summary of the Utility Model

[0004] Based on this, in view of the problem that after evacuating, a negative pressure is formed inside the cell, which will further tighten the sealing glue nail, making it difficult to control the semi-inserted state of the sealing glue nail, difficult to inject helium, creating an illusion of good sealing in the case of testing the sealing performance by returning helium, resulting in easy mixing of moisture in subsequent processes or generating safety risks during the subsequent sealing nail welding process, it is necessary to provide a battery and its sealing glue nail.

[0005] A sealing glue nail for a battery, the cover plate of the battery is provided with a liquid injection hole, and the sealing glue nail of the battery includes:

[0006] A deformation column, one end of the deformation column is axially provided with a deformation groove, the deformation column has a first state and a second state. In the first state, the outer wall of the deformation column is in clearance fit with the inner wall of the liquid injection hole. In the second state, the outer wall of the deformation column abuts against and is in sealing fit with the inner wall of the liquid injection hole; and

[0007] An expansion thread assembly, the expansion thread assembly is located in the deformation groove, and the expansion thread assembly can expand radially along the deformation groove and squeeze the inner wall of the deformation groove, so that the deformation column switches from the first state to the second state.

[0008] In one embodiment, the expansion thread assembly includes a threaded part and a sleeve;

[0009] The sleeve is provided with a deformation hole along the axial direction of the deformation column, and the inner wall of the deformation hole along the axial direction of one end close to the bottom wall of the deformation groove is provided with an internal thread. The threaded member includes a connected screw and a head, and the screw has an external thread. The head abuts against an end surface of the sleeve away from the bottom wall of the deformation groove, and the screw cooperates with the inner wall thread of the deformation hole to allow the side wall of the sleeve to expand radially along the deformation groove.

[0010] In one embodiment, the sleeve includes a matching sleeve and a deforming sleeve connected to each other;

[0011] The deformation tube is provided with an expansion hole along the axial direction of the deformation column, the screw rod is passed through the expansion hole, and the head abuts against an end surface of the deformation tube away from the bottom wall of the deformation groove;

[0012] The matching cylinder is provided with a matching hole along the axial direction of the deformation column, the inner wall of the matching hole is provided with the internal thread, and the screw rod is threadedly matched with the inner wall of the matching hole to make the side wall of the deformation cylinder expand along the radial direction of the deformation groove.

[0013] In one embodiment, a plurality of through holes are formed on the side wall of the deformation cylinder along its circumference.

[0014] In one embodiment, the plurality of through holes are evenly arranged along the circumference of the deformation cylinder.

[0015] In one embodiment, the cross-section of the through hole is rectangular, and the cross-section of the through hole extends along the axial direction of the deformation cylinder.

[0016] In one embodiment, along the axial direction of the deformation column away from the opening of the deformation groove, the outer diameter of one end of the deformation column away from the opening of the deformation groove gradually decreases.

[0017] In one embodiment, a sink groove is formed on an end surface of the deformation column away from the bottom wall of the deformation groove, and the head is located in the sink groove.

[0018] In one embodiment, the outer circumference of the deformation column has an annular protrusion;

[0019] The annular protrusion is located at one end of the deformation column away from the bottom wall of the deformation groove, and the annular protrusion cooperates with the inner wall of the injection hole. The outer side wall of the annular protrusion is provided with a plurality of through grooves, and the through grooves extend along the axial direction of the deformation column.

[0020] An embodiment of the present application further provides a battery, the battery comprising: a cover plate and the sealing glue nail of the battery;

[0021] The cover plate is provided with a liquid injection hole, and the sealing glue nail of the battery is used to be inserted into the liquid injection hole to be gap-matched or sealed against the inner wall of the liquid injection hole.

[0022] During the actual use of the sealing nail of the above-mentioned battery, the expansion thread assembly is first placed in the deformation groove, and then the deformation column is inserted into the injection hole, wherein the opening of the deformation groove is located on the side away from the interior of the battery cell, and the deformation column is located at one end of the bottom wall of the deformation groove and inserted into the injection hole, and then the outer wall of the deformation column and the inner wall of the injection hole are gap-matched to form a gas channel. At this time, the deformation column is in the first state, and the interior of the injection hole is vacuumed and helium is injected into the injection hole in turn through the channel, and then the expansion thread assembly expands along the radial direction of the deformation groove, driving the outer wall of the deformation column to expand along The deformation groove expands radially in a direction away from the expansion thread assembly, so that the outer wall of the deformation column is sealed and abutted against the inner wall of the injection hole, thereby achieving sealing of the injection hole. At this time, the deformation column is in the second state, and finally the sealing is tested. The present application accurately controls the state of the sealing nail of the battery and the inner wall of the injection hole through the clearance fit between the outer wall of the deformation column and the inner wall of the injection hole and the expansion of the expansion thread assembly, thereby ensuring the injection of helium and good sealing after the injection of helium, and avoiding the mixing of moisture into the injection hole in subsequent processes or safety risks during the welding of the sealing nails of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cooperation between the sealing nail and the cover plate of the battery in the prior art.

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the sealing nail.

[0025] Figure 3 The figure is a schematic diagram of the cooperation between the sealing nail of a battery and the cover plate of the battery according to an embodiment.

[0026] Figure 4 for Figure 3 Schematic diagram of the sealing nails of the battery.

[0027] Figure 5 for Figure 4 A cross-sectional view of the sealing nails of the mid-cell.

[0028] Figure 6 for Figure 4 Schematic diagram of the expansion thread assembly.

[0029] Figure 7 for Figure 6 Cross-sectional view of the expansion thread assembly.

[0030] Figure 8 for Figure 7 Schematic diagram of the middle sleeve.

[0031] Explanation of the reference numerals in the attached drawings:

[0032] 10 - Sealant nail

[0033] 100 - Sealant nail of the battery

[0034] 110 - Deformation column; 111 - Deformation groove; 112 - Counterbore

[0035] 120 - Expansion thread assembly; 121 - Threaded part; 122 - Sleeve; 123 - Deformation hole; 124 - Screw; 1241 - External thread; 125 - Head; 126 - Fitting cylinder; 1261 - Internal thread; 127 - Deformation cylinder; 1271 - Through hole; 128 - Expansion hole; 129 - Fitting hole

[0036] 130 - Annular protrusion; 131 - Through slot

[0037] 210 - Cover plate; 211 - Liquid injection hole Detailed implementation manners

[0038] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following describes the detailed implementation manners of the present application with reference to the attached drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the attached drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0040] In addition, if there appear such terms as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there appears the term "multiple", the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0041] In this application, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In this application, unless otherwise clearly specified and defined, if there is a description such as the first feature being "on" or "under" the second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0044] Refer to Figure 3 , Figure 3 shows a cross-sectional view of the sealant nail 100 of the battery in an embodiment of this application inserted into the liquid injection hole 211 of the battery cover 210. The sealant nail 100 of the battery provided in an embodiment of this application includes a deformation column 110 and an expansion thread assembly 120.

[0045] Refer to Figure 3 , Figure 4 and Figure 5, in the sealing glue nail 100 of the above-mentioned battery, a deformation groove 111 is axially formed at one end of the deformation column 110. The deformation column 110 has a first state and a second state. In the first state, there is a clearance fit between the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211. In the second state, the outer wall of the deformation column 110 abuts against and is in a sealing fit with the inner wall of the liquid injection hole 211. The expansion thread assembly 120 is located in the deformation groove 111. The expansion thread assembly 120 can expand radially along the deformation groove 111 and squeeze the inner wall of the deformation groove 111, so that the deformation column 110 switches from the first state to the second state.

[0046] During the actual use of the above-mentioned sealing glue nail 100 of the battery, first, the expansion thread assembly 120 is placed in the deformation groove 111, and then the deformation column 110 is inserted into the liquid injection hole 211. The opening of the deformation groove 111 is located on the side away from the inside of the battery cell. One end of the deformation column 110 located at the bottom wall of the deformation groove 111 is inserted into the liquid injection hole 211. Subsequently, a clearance fit is formed between the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211, thereby forming a gas channel. At this time, the deformation column is in the first state. Through this channel, the inside of the liquid injection hole 211 is evacuated and helium is injected into the liquid injection hole 211 in sequence. Subsequently, the expansion thread assembly 120 expands radially along the deformation groove 111, driving the outer wall of the deformation column 110 to expand radially along the deformation groove 111 in a direction away from the expansion thread assembly 120, so that the outer wall of the deformation column 110 is in sealing contact with the inner wall of the liquid injection hole 211, realizing the sealing of the liquid injection hole 211. At this time, the deformation column is in the second state. Finally, the sealing performance is tested. In the present application, through the clearance fit between the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211 and the expansion of the expansion thread assembly 120, the state of the sealing glue nail 100 of the battery and the inner wall of the liquid injection hole 211 can be accurately controlled, ensuring the injection of helium and good sealing after helium injection, and avoiding the entry of moisture into the liquid injection hole 211 in subsequent processes or safety risks during the welding process of the sealing glue nail 100 of the battery.

[0047] Refer to Figure 5 , Figure 6 and Figure 7 , in an embodiment, the expansion thread assembly 120 includes a threaded member 121 and a sleeve 122. The sleeve 122 is axially provided with a deformation hole 123 along the deformation column 110. The inner wall of the deformation hole 123 near the bottom wall of the deformation groove 111 along its axial direction is provided with an internal thread 1261. The threaded member 121 includes a screw rod 124 and a head 125 connected to each other. The screw rod 124 has an external thread 1241. The head 125 abuts against the end face of the sleeve 122 away from the bottom wall of the deformation groove 111. The screw rod 124 is in threaded fit with the inner wall of the deformation hole 123, so that the side wall of the sleeve 122 expands radially along the deformation groove 111.

[0048] In this embodiment, the specific process of the expansion of the expansion screw assembly 120 is as follows. First, insert the sleeve 122 into the deformation groove 111 of the deformation column 110. Then, preliminarily mate the external thread 1241 of the screw 124 with the internal thread 1261 on the inner wall of the deformation hole 123. Next, insert the deformation column 110 into the liquid injection hole 211. At this time, the sleeve 122 and the deformation column 110 have not expanded radially along the deformation groove 111. After helium injection is completed, that is, after helium return, rotate the head 125 to move the screw 124 in the direction close to the bottom wall of the deformation groove 111 until it finally abuts against the bottom wall of the deformation groove 111. Continue to rotate the head 125. At this time, the screw 124 continues to be in threaded engagement with the deformation hole 123. The threaded part of the sleeve 122 will move away from the bottom wall of the deformation groove 111 during the threaded engagement process. At the same time, the head 125 abuts against one end face of the sleeve 122 facing away from the bottom wall of the deformation groove 111. Therefore, the threaded part of the sleeve 122 will squeeze the part between the threaded part of the sleeve 122 and the head 125, causing this part to deform. Due to the presence of the screw 124, the sleeve 122 cannot deform in the direction close to the screw 124. Therefore, it only deforms in the direction away from the screw 124, thereby squeezing the inner wall of the deformation groove 111, causing the side wall of the deformation groove 111 to expand and deform radially in the direction close to the inner wall of the liquid injection hole 211, so that the outer wall of the deformation groove 111 can abut against the inner wall of the liquid injection hole 211, thereby sealing the liquid injection hole 211.

[0049] Specifically, the deformation column 110 is made of an elastic material such as rubber or silica gel and can expand and deform in a timely manner when subjected to an external force. The sleeve 122 is made of a metal material, which can ensure that during the deformation process due to threaded engagement, when the screw 124 stops rotating, the deformation of the sleeve 122 is stabilized in the current state, so as to be able to stably squeeze the deformation column 110 and ensure the stable deformation of the deformation column 110.

[0050] Refer to Figure 6 、 Figure 7 and Figure 8 In an embodiment, the sleeve 122 includes a mating cylinder 126 and a deformation cylinder 127 that are connected. The deformation cylinder 127 is axially provided with an expansion hole 128 along the deformation column 110, and the screw 124 passes through the expansion hole 128. The head 125 abuts against one end face of the deformation cylinder 127 facing away from the bottom wall of the deformation groove 111. The mating cylinder 126 is axially provided with a mating hole 129 along the deformation column 110. The inner wall of the mating hole 129 is provided with an internal thread 1261, and the screw 124 is in threaded engagement with the inner wall of the mating hole 129 to cause the side wall of the deformation cylinder 127 to expand radially along the deformation groove 111.

[0051] In this embodiment, the specific process of the expansion of the expansion screw assembly 120 is as follows. First, insert the sleeve 122 into the deformation groove 111 of the deformation column 110. Then, preliminarily fit the external thread 1241 of the screw 124 with the internal thread 1261 on the inner wall of the mating cylinder 126. Next, insert the deformation column 110 into the liquid injection hole 211. At this time, the sleeve 122 and the deformation column 110 have not expanded radially along the deformation groove 111. After the helium injection, that is, after the helium return, rotate the head 125 to move the screw 124 towards the bottom wall of the deformation groove 111 until it finally abuts against the bottom wall of the deformation groove 111. Continue to rotate the head 125. At this time, the screw 124 and the mating cylinder 126 continue to be in threaded engagement. During the threaded engagement process, the mating cylinder 126 will move away from the bottom wall of the deformation groove 111. At the same time, the head 125 abuts against one end face of the deformation cylinder 127 that is away from the bottom wall of the deformation groove 111. Therefore, the mating cylinder 126 will squeeze the deformation cylinder 127, causing the deformation cylinder 127 to deform. Due to the presence of the screw 124, the deformation cylinder 127 cannot deform towards the screw 124. Therefore, it can only deform away from the screw 124, thereby squeezing the inner wall of the deformation groove 111, causing the side wall of the deformation groove 111 to expand and deform radially towards the inner wall of the liquid injection hole 211, so that the outer wall of the deformation groove 111 can abut against the inner wall of the liquid injection hole 211, thereby sealing the liquid injection hole 211.

[0052] Refer to Figure 6 、 Figure 7 and Figure 8 , in one embodiment, a plurality of through holes 1271 are formed in the side wall of the deformation cylinder 127 along its circumferential direction, so that the part of the side wall of the deformation cylinder 127 between the through holes 1271 can be more easily deformed, so as to abut against the inner wall of the deformation groove 111 and squeeze the side wall of the deformation column 110.

[0053] Refer to Figure 6 、 Figure 7 and Figure 8 , in one embodiment, the plurality of through holes 1271 are evenly arranged along the circumferential direction of the deformation cylinder 127, so as to ensure that during the process of the screw 124 and the mating cylinder 126 being in threaded engagement and squeezing the deformation cylinder 127, the squeezing force of the mating cylinder 126 enables the radial expansion of the deformation cylinder 127 to be evenly distributed around the circumferential direction of the deformation cylinder 127, so that the deformation cylinder 127 can expand evenly around its circumferential direction, and the side wall of the deformation column 110 can expand evenly around the circumferential direction of the deformation column 110, completely sealing the circumferential direction of the liquid injection hole 211 and ensuring the sealing effect.

[0054] Refer to Figure 6 、 Figure 7 and Figure 8, in one embodiment, the cross-sectional shape of the through hole 1271 is rectangular, and the cross-section of the through hole 1271 extends along the axial direction of the deformation cylinder 127. Thus, the length of the deformation cylinder 127 that can be easily deformed is the length of the through hole 1271 along the axial direction of the deformation cylinder 127, which increases the deformation amount of the deformation cylinder 127 and ensures that the expansion deformation of the side wall of the deformation column 110 can completely seal the liquid injection hole 211. At the same time, since the shape of the through hole 1271 is rectangular, it can adapt to the deformation of the deformation cylinder 127 along the axial direction of the deformation cylinder 127. That is, a plurality of rectangular through holes 1271 are evenly arranged along the circumferential direction of the deformation cylinder 127, so that when the part between two through holes 1271 bends or even folds along the radial direction of the deformation cylinder 127, the force is evenly distributed along the axial direction of the deformation cylinder 127, and the situation where this part is pulled or even broken due to uneven force will not occur.

[0055] Refer to Figure 3 , Figure 4 and Figure 5 , in one embodiment, along the axial direction of the deformation column 110 and away from the opening of the deformation groove 111, the outer diameter of the end of the deformation column 110 away from the opening of the deformation groove 111 gradually decreases, so as to facilitate the insertion of this end into the liquid injection hole 211.

[0056] Refer to Figure 3 , Figure 4 and Figure 5 , in one embodiment, a counterbore 112 is formed on one end face of the deformation column 110 away from the bottom wall of the deformation groove 111. The counterbore 112 communicates with the deformation groove 111, and the head 125 is located in the counterbore 112, so that the opening of the deformation groove 111 is more flat.

[0057] Refer to Figure 3 , Figure 4 and Figure 5 , in one embodiment, the outer periphery of the deformation column 110 has an annular protrusion 130. The annular protrusion 130 is located at one end of the deformation column 110 away from the bottom wall of the deformation groove 111. The annular protrusion 130 cooperates with the inner wall of the liquid injection hole 211. A plurality of through grooves 131 are formed on the outer side wall of the annular protrusion 130, and the through grooves 131 extend along the axial direction of the deformation column 110. Thus, the relative position of the deformation column 110 and the liquid injection hole 211 is fixed by the cooperation of the annular protrusion 130 and the inner wall of the liquid injection hole 211. A channel for vacuum pumping and helium injection is formed by the clearance fit between the through grooves 131 and the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211. Subsequently, the channel is sealed by the abutment of the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211.

[0058] In another embodiment, it is also possible that the annular protrusion 130 is perforated along the axial direction of the deformation column 110 to achieve ventilation.

[0059] Specifically, a plurality of through slots 131 are evenly arranged circumferentially around the deformation column 110, so that when evacuating and injecting helium, the forces received by the annular protrusion 130 are evenly distributed circumferentially around it.

[0060] An embodiment of the present application further provides a battery, which includes: a cover plate 210 and a sealing glue nail 100 of the battery.

[0061] The cover plate 210 is provided with a liquid injection hole 211, and the sealing glue nail 100 of the battery is used to be inserted into the liquid injection hole 211 for clearance fit or sealing abutment with the inner wall of the liquid injection hole 211.

[0062] During the actual use of the above-mentioned sealing glue nail 100 of the battery, first, the expansion screw assembly 120 is placed in the deformation groove 111, and then the deformation column 110 is inserted into the liquid injection hole 211. The opening of the deformation groove 111 is located on the side away from the inside of the battery cell. One end of the deformation column 110 located at the bottom wall of the deformation groove 111 is inserted into the liquid injection hole 211. Subsequently, a clearance fit is formed between the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211, thereby forming a gas channel. At this time, the deformation column is in the first state. Through this channel, the inside of the liquid injection hole 211 is evacuated and helium is injected into the liquid injection hole 211 in sequence. Subsequently, the expansion screw assembly 120 expands radially along the deformation groove 111, driving the outer wall of the deformation column 110 to expand radially along the deformation groove 111 in a direction away from the expansion screw assembly 120, so that the outer wall of the deformation column 110 is in sealing abutment with the inner wall of the liquid injection hole 211, realizing the sealing of the liquid injection hole 211. At this time, the deformation column is in the second state. Finally, the sealing performance is tested. The present application can accurately control the state of the sealing glue nail 100 of the battery and the inner wall of the liquid injection hole 211 through the clearance fit between the outer wall of the deformation column 110 and the inner wall of the liquid injection hole 211 and the expansion of the expansion screw assembly 120, ensuring the injection of helium and good sealing after helium injection, and avoiding the entry of moisture into the liquid injection hole 211 in subsequent processes or safety risks during the welding process of the sealing glue nail 100 of the battery.

[0063] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0064] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery sealing nail, the battery cover is provided with a liquid injection hole, characterized in that: The sealing nail of the battery comprises: A deformation column, wherein one end of the deformation column is provided with a deformation groove along its axial direction, and the deformation column has a first state and a second state. In the first state, the outer wall of the deformation column and the inner wall of the injection hole are in clearance fit, and in the second state, the outer wall of the deformation column and the inner wall of the injection hole are in abutment and sealed fit; and An expansion thread assembly is located in the deformation groove, and the expansion thread assembly can expand along the radial direction of the deformation groove and squeeze the inner wall of the deformation groove to switch the deformation column from the first state to the second state.

2. The battery sealing nail according to claim 1, characterized in that: The expansion thread assembly comprises a threaded member and a sleeve; The sleeve is provided with a deformation hole along the axial direction of the deformation column, and the inner wall of the deformation hole along the axial direction of one end close to the bottom wall of the deformation groove is provided with an internal thread. The threaded member includes a connected screw and a head, and the screw has an external thread. The head abuts against an end surface of the sleeve away from the bottom wall of the deformation groove, and the screw cooperates with the inner wall thread of the deformation hole to allow the side wall of the sleeve to expand radially along the deformation groove.

3. The battery sealing nail according to claim 2, characterized in that: The sleeve comprises a matching sleeve and a deformation sleeve connected to each other; The deformation tube is provided with an expansion hole along the axial direction of the deformation column, the screw rod is passed through the expansion hole, and the head abuts against an end surface of the deformation tube away from the bottom wall of the deformation groove; The matching cylinder is provided with a matching hole along the axial direction of the deformation column, the inner wall of the matching hole is provided with the internal thread, and the screw rod is threadedly matched with the inner wall of the matching hole to make the side wall of the deformation cylinder expand along the radial direction of the deformation groove.

4. The battery sealing nail according to claim 3, characterized in that: The side wall of the deformation cylinder is provided with a plurality of through holes along its circumference.

5. The battery sealing nail according to claim 4, characterized in that: The plurality of through holes are evenly arranged along the circumference of the deformation cylinder.

6. The battery sealing nail according to claim 4, characterized in that: The cross-section of the through hole is a rectangle, and the cross-section of the through hole extends along the axial direction of the deformation cylinder.

7. The battery sealing nail according to claim 1, characterized in that: Along the axial direction of the deformation column away from the opening of the deformation groove, the outer diameter of one end of the deformation column away from the opening of the deformation groove gradually decreases.

8. The battery sealing nail according to claim 2, characterized in that: A sinking groove is formed on one end surface of the deformation column away from the bottom wall of the deformation groove, and the head is located in the sinking groove.

9. The battery sealing nail according to claim 1, characterized in that: The outer periphery of the deformation column has an annular protrusion; The annular protrusion is located at one end of the deformation column away from the bottom wall of the deformation groove, and the annular protrusion cooperates with the inner wall of the injection hole. The outer side wall of the annular protrusion is provided with a plurality of through grooves, and the through grooves extend along the axial direction of the deformation column.

10. A battery, characterized in that: The battery comprises: a cover plate and a sealing nail of the battery according to any one of claims 1 to 9; The cover plate is provided with a liquid injection hole, and the sealing glue nail of the battery is used to be inserted into the liquid injection hole to be gap-matched or sealed against the inner wall of the liquid injection hole.

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