Battery and battery pack

Abstract

The utility model provides a battery and battery pack, the battery includes cell, shell, top cover, sealing nail and sealing piece, the top cover is provided with mutually communicated liquid injection hole, the top cover is connected with the shell, the top cover and the shell define the chamber together, the cell is arranged in the chamber, the sealing nail includes inserting portion and pressing portion, the inserting portion is arranged in the liquid injection hole, the pressing portion is arranged in the liquid injection hole, and the sealing piece is arranged in the sealing nail. The pressing part is connected to one end, far away from the battery cell, of the inserting part, the pressing part is located outside the cavity, the inserting part penetrates through the sealing piece, the sealing piece is located outside the cavity, and the pressing part and the top cover clamp the sealing piece. Due to the fact that the sealing piece is pressed on the top cover by the pressing portion of the sealing nail, the sealing piece is not prone to displacement, the welding quality between the sealing piece and the top cover is improved, and the sealing effect of the sealing piece and the sealing nail on the liquid injection hole is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery and a battery pack. Background Art

[0002] During the production process of the battery, it is necessary to inject electrolyte into the battery through the injection hole of the top cover. After the electrolyte injection is completed, the injection hole needs to be sealed. At present, the common way to seal the injection hole is as follows: first insert a sealing nail into the injection hole, then cover a sealing sheet on top of the sealing nail, and finally weld the sealing sheet to the top cover. However, in the process of welding the sealing sheet, the sealing sheet is prone to tilting, offset, etc., and the actual position of the sealing sheet will deviate from the ideal position. This will affect the welding quality of the sealing sheet and the top cover (for example, there will be cold welding, blown welding, etc.), thereby affecting the sealing effect of the injection hole. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery, wherein a sealing sheet is clamped by a sealing nail and a top cover, and the sealing sheet is not prone to tilting, deflecting, etc.

[0004] The utility model also provides a battery pack including the battery.

[0005] According to the first aspect of the present invention, the battery comprises: a battery cell; a shell; a top cover, the top cover is provided with liquid injection holes that are interconnected, the top cover is connected to the shell, the top cover and the shell together define a chamber, the battery cell is arranged in the chamber; a sealing nail, the sealing nail comprises a plug-in portion and a pressing portion, the plug-in portion is arranged in the liquid injection hole, the pressing portion is connected to an end of the plug-in portion away from the battery cell, and the pressing portion is located outside the chamber; a sealing sheet, the plug-in portion passes through the sealing sheet, the sealing sheet is located outside the chamber, and the pressing portion and the top cover clamp the sealing sheet.

[0006] The battery according to the first embodiment of the utility model has at least the following beneficial effects: since the sealing sheet is clamped by the pressing part and the top cover (or the sealing sheet is pressed on the top cover by the pressing part), the sealing sheet is not easy to deviate or tilt, etc. Therefore, the sealing sheet is not easy to deviate when welding with the top cover, which is conducive to improving the welding quality between the sealing sheet and the top cover, thereby improving the sealing effect of the sealing sheet and the sealing nail on the injection hole.

[0007] According to some embodiments of the present utility model, the sealing sheet is sealingly connected to the top cover, and the pressing portion is sealingly connected to the sealing sheet, so that the sealing pin and the sealing sheet seal the liquid injection hole.

[0008] According to some embodiments of the present utility model, the sealing sheet is made of metal, the sealing sheet is welded to the top cover, the pressing part is made of plastic, and the pressing part is connected to the sealing sheet by hot-melt.

[0009] According to some embodiments of the present invention, the melting point of the sealing nail is not less than 120°C and not more than 200°C.

[0010] According to some embodiments of the utility model, the sealing sheet is provided with a receiving groove, the pressing part is arranged in the receiving groove, and there is a gap between the outer peripheral edge of the pressing part and the side wall of the receiving groove.

[0011] According to some embodiments of the utility model, the sealing sheet is provided with a receiving groove, the opening of the receiving groove is arranged on the top surface of the sealing sheet, the pressing part is arranged in the receiving groove, and the bottom surface of the pressing part is in contact with the bottom wall of the receiving groove.

[0012] According to some embodiments of the present invention, the top surface of the pressing portion is flush with the top surface of the sealing sheet, or the top surface of the pressing portion is lower than the top surface of the sealing sheet.

[0013] According to some embodiments of the utility model, the sealing sheet also includes an anti-slip portion, which is elastic and located in the chamber. The anti-slip portion and the pressing portion are respectively connected to the two ends of the plug-in portion, and one end of the anti-slip portion close to the plug-in portion is a butt end, and the outer diameter of the butt end is larger than the aperture of the injection hole, and a side surface of the top cover facing the chamber abuts against the end face of the butt end.

[0014] According to some embodiments of the present invention, the diameter of the anti-slip portion gradually decreases from an end of the anti-slip portion close to the pressing portion to an end of the anti-slip portion away from the pressing portion.

[0015] A battery pack according to an embodiment of the second aspect of the utility model includes a battery according to an embodiment of the first aspect.

[0016] The beneficial effects of the battery pack according to the embodiment of the second aspect of the utility model are the same as the beneficial effects of the battery of the embodiment of the first aspect, which will not be repeated here.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1A schematic diagram of a battery according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a sealing assembly according to an embodiment of the present utility model;

[0021] Figure 3 is a cross-sectional view of a sealing assembly;

[0022] Figure 4 is a schematic diagram of the matching relationship between the sealing assembly and the top cover in one embodiment;

[0023] Figure 5 A schematic diagram of the matching relationship between the sealing assembly and the top cover in another embodiment;

[0024] Figure 6 is a cross-sectional view of a sealing nail;

[0025] Figure 7 A cross-sectional view of the sealing sheet.

[0026] Reference numerals:

[0027] 100 - battery, 101 - housing, 102 - positive terminal, 103 - top cover, 104 - mounting groove, 105 - sealing assembly, 106 - negative terminal, 107 - sealing sheet, 108 - sealing nail, 109 - injection hole;

[0028] 201-pressing part, 202-insertion part, 203-anti-slip part;

[0029] 301 - receiving groove, 302 - through hole. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Figure 1 A battery 100 according to an embodiment of the present invention is shown. The battery 100 includes a housing 101 , a top cover 103 , a sealing assembly 105 and a battery cell (the battery cell is not shown in the drawing). Figure 1 The battery 100 shown is in a rectangular parallelepiped shape. In other embodiments not shown in the figures, the battery 100 may also be configured as a cylindrical battery.

[0035] The shell 101 is hollow inside, and an opening is provided at the top of the shell 101. The top cover 103 is connected to the shell 101 and the top cover 103 is installed at the opening. The top cover 103 and the shell 101 jointly define a chamber (the space enclosed by the lower surface of the top cover 103 and the inner surface of the shell 101 is the chamber), and the battery cell is arranged in the chamber. That is, the battery cell is located inside the shell 101 and below the top cover 103. In order to improve the structural strength of the battery 100, the top cover 103 and the shell 101 can be made of metal materials such as aluminum alloy and steel. Accordingly, the top cover 103 and the shell 101 can be connected by welding. The battery cell can be set as a wound battery cell or a laminated battery cell. The battery 100 also includes a positive terminal 102 and a negative terminal 106. The top of the positive terminal 102 and the top of the negative terminal 106 are exposed outside the chamber, and the bottom of the positive terminal 102 and the bottom of the negative terminal 106 are located inside the chamber, the positive terminal of the battery cell is electrically connected to the bottom of the positive terminal 102, and the negative terminal of the battery cell is electrically connected to the bottom of the positive terminal 102. The positive terminal 102 and the negative terminal 106 are used to connect to conductive parts such as wires and busbars.

[0036] The top cover 103 is provided with a liquid injection hole 109 (such as Figure 4 As shown in FIG. 1 , when the injection hole 109 is not blocked, the injection nozzle can inject the electrolyte into the chamber from the injection hole 109. After the injection is completed, the sealing component 105 seals the injection hole 109 to prevent the electrolyte from leaking out of the chamber and prevent water and dust from the external environment from entering the chamber.

[0037] like Figure 2 As shown, the sealing assembly 105 includes a sealing pin 108 and a sealing sheet 107. Figure 3 As shown, the sealing nail 108 includes an inserting portion 202 and a pressing portion 201. Figure 4 As shown, the plug-in portion 202 is arranged in the injection hole 109, thereby blocking the injection hole 109. In order to improve the blocking effect of the plug-in portion 202, the outer peripheral surface of the plug-in portion 202 can be in contact with the hole wall of the injection hole 109. In addition, the plug-in portion 202 passes through the sealing sheet 107. The pressing portion 201 is connected to the end of the plug-in portion 202 away from the battery cell, that is, the pressing portion 201 is connected to the top of the plug-in portion 202. The pressing portion 201 is located outside the cavity, the sealing sheet 107 is also located outside the cavity, and the pressing portion 201 and the top cover 103 clamp the sealing sheet 107 together.

[0038] in, Figure 4 The chamber is not specifically shown. Figure 4 As a reference, the chamber is actually located below the bottom surface of the top cover 103. Since the pressing part 201 is located above the bottom surface of the top cover 103, the pressing part 201 is located outside the chamber.

[0039] “The pressing part 201 and the top cover 103 jointly clamp the sealing sheet 107” can also be regarded as the pressing part 201 pressing the sealing sheet 107 onto the top cover 103. Since the sealing sheet 107 is clamped (or pressed onto the top cover 103 by the pressing part 201), the sealing sheet 107 is not prone to deviation or tilt. Therefore, the sealing sheet 107 is not prone to deviation when welding with the top cover 103, which is conducive to improving the welding quality between the sealing sheet 107 and the top cover 103, thereby improving the sealing effect of the sealing sheet 107 and the sealing pin 108 on the injection hole 109.

[0040] For the manufactured battery 100, the sealing sheet 107 is sealed and connected to the top cover 103, and the pressing part 201 is also sealed and connected to the sealing sheet 107, so that the sealing nail 108 and the sealing sheet 107 seal the injection hole 109, prevent the electrolyte from leaking out of the chamber, and prevent water and dust from the external environment from entering the chamber. In some embodiments, the material of the sealing sheet 107 can be metal, and the sealing sheet 107 is welded to the top cover 103 to achieve a sealed connection between the sealing sheet 107 and the top cover 103. More specifically, the weld between the outer peripheral edge of the sealing sheet 107 and the top cover 103 can be a complete circle. The material of the sealing nail 108 is plastic, and the pressing part 201 of the sealing nail 108 is hot-melt connected to the sealing sheet 107, so as to achieve a sealed connection between the pressing part 201 and the sealing sheet 107. Of course, in other embodiments not shown in the figure, the sealing connection between the pressing part 201 and the sealing sheet 107 can also be achieved by bonding; or, a sealing ring is provided between the pressing part 201 and the sealing sheet 107; or if the sealing pin 108 is made of metal, then the pressing part 201 and the sealing sheet 107 can also be welded to each other to achieve sealing.

[0041] For the embodiment in which the sealing sheet 107 is made of metal and the sealing pin 108 is made of plastic, "the pressing part 201 is hot-melt connected to the sealing sheet 107" means that at least a portion of the pressing part 201 is first melted by heat and then solidified, and the re-solidified pressing part 201 is connected to the sealing sheet 107 and fixed to each other. The molten plastic can fill or block the gap between the pressing part 201 and the sealing sheet 107, thereby achieving sealing. Therefore, the hot-melt connection between the pressing part 201 and the sealing sheet 107 means that there is no need to use other components (such as a sealing ring) to seal the pressing part 201 and the sealing sheet 107, the number of components of the battery 100 is small, and the production difficulty and cost of the battery 100 are low. In addition, the heat generated when the sealing sheet 107 is welded to the top cover 103 can also be transferred to the pressing part 201, and this heat can melt the pressing part 201; when the welding is completed, the pressing part 201 is no longer heated, and the pressing part 201 cools and solidifies, thereby achieving the fixation between the pressing part 201 and the seal. Therefore, after the welding of the sealing sheet 107 is completed, the hot melt connection between the pressing part 201 and the sealing sheet 107 can be achieved after the pressing part 201 cools down, and there is no need to set up a separate process for connecting the pressing part 201 and the sealing sheet 107. That is, the welding process of the sealing sheet 107 and the melting process of the pressing part 201 overlap in time, and the two are carried out at the same time. The hot melt connection between the pressing part 201 and the sealing sheet 107 is conducive to improving the production efficiency of the battery 100.

[0042] In some embodiments, the sealing pin 108 itself can also serve as an explosion-proof valve, and the battery 100 does not need to be additionally provided with an explosion-proof valve, which is also conducive to reducing the cost of the battery 100. When the battery 100 has an internal short circuit or thermal runaway, a large amount of high-temperature gas is generated in the chamber, the sealing pin 108 is melted by the heat, and the sealing of the injection hole 109 by the sealing pin 108 is destroyed. The sealing of the injection hole 109 by the sealing pin 108 is destroyed, including at least one of the following situations: (1) After the sealing pin 108 melts, a hole appears in the sealing pin 108 itself; (2) After the sealing pin 108 melts, a gap appears between the sealing pin 108 and the sealing sheet 107 and the top cover 103. After the sealing of the injection hole 109 by the sealing pin 108 is destroyed, the high-temperature gas can be quickly discharged from the injection hole 109 to the outside of the chamber. In this way, the pressure inside the battery 100 decreases, and the risk of explosion of the battery 100 is reduced.

[0043] In some embodiments, the melting point of the sealing nail 108 may be not less than 120°C and not more than 200°C. This setting is mainly to make the sealing nail 108 suitable as an explosion-proof valve. If the melting point of the sealing nail 108 is less than 120°C, the melting point of the sealing nail 108 is too low, and the critical temperature of the battery 100 for exhaust and pressure relief is low, which is not conducive to maintaining the long-term operation of the battery 100. If the melting point of the sealing nail 108 is greater than 200°C, the melting point of the sealing nail 108 is too high, and the critical temperature at which the sealing nail 108 is damaged in the injection hole 109 is too high, and the critical temperature of the battery 100 for exhaust and pressure relief is high, and the risk of explosion of the battery 100 is high. In addition, the melting point of the sealing nail 108 is not more than 200°C, which is also conducive to melting the pressing part 201 through the heat generated when the sealing sheet 107 is welded. If the melting point of the sealing pin 108 is greater than 200°C, the melting point of the pressing part 201 is too high, and the heat generated during the welding of the sealing sheet 107 makes it difficult to melt the pressing part 201, thereby making it difficult to simultaneously melt the pressing part 201 during the welding of the sealing sheet 107. In order to make the melting point of the sealing pin 108 not less than 120°C and not more than 200°C, the material of the sealing pin 108 can be set to polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), etc.; of course, in addition to the plastics listed above, the sealing pin 108 can also be set to other materials, as long as its melting point is within the above temperature range, the sealing pin 108 can be used as an explosion-proof valve.

[0044] like Figure 7As shown, the sealing sheet 107 is provided with a receiving groove 301 and a through hole 302, the top end of the through hole 302 is arranged on the bottom wall of the receiving groove 301, and the opening of the receiving groove 301 is arranged on the top surface of the sealing sheet 107. The plug-in portion 202 is arranged in the through hole 302, and the pressing portion 201 is arranged in the receiving groove 301, and the bottom surface of the pressing portion 201 is in contact with the bottom wall of the receiving groove 301. The receiving groove 301 can accommodate at least a portion of the pressing portion 201, reducing the portion of the pressing portion 201 protruding above the top surface of the sealing sheet 107, thereby improving the flatness of the top of the sealing assembly 105. In order to further improve the flatness of the top of the sealing assembly 105, the top surface of the pressing portion 201 is flush with the top surface of the sealing sheet 107, or the top surface of the pressing portion 201 is lower than the top surface of the sealing sheet 107. The receiving groove 301 can also play a foolproof role, thereby reducing the risk of the sealing sheet 107 being placed upside down. In addition, in some embodiments, there is a gap between the outer peripheral edge of the pressing part 201 and the side wall of the receiving groove 301. This arrangement allows the receiving groove 301 to leave enough space to accommodate the melted plastic of the pressing part 201, preventing the plastic from overflowing out of the receiving groove 301 or even overflowing onto the top cover 103.

[0045] like Figure 4 As shown, in some embodiments, “the pressing part 201 and the top cover 103 clamp the sealing sheet 107” specifically means that the bottom surface of the pressing part 201 abuts against the bottom wall of the receiving groove 301, and the top surface of the top cover 103 abuts against the bottom surface of the sealing sheet 107. The top surface of the top cover 103 and the sealing sheet 107 are welded.

[0046] like Figure 5 As shown, in other embodiments, the top cover 103 may be provided with a mounting groove 104, and the sealing sheet 107 is disposed in the mounting groove 104. The mounting groove 104 can position the sealing sheet 107, so as to facilitate the assembly between the sealing sheet 107 and the top cover 103. Figure 5 In the embodiment shown, “the pressing part 201 and the top cover 103 clamp the sealing sheet 107” specifically means that the bottom surface of the pressing part 201 abuts against the bottom wall of the receiving groove 301, and the bottom wall of the installation groove 104 of the top cover 103 abuts against the bottom surface of the sealing sheet 107. In addition, the bottom wall and / or side wall of the installation groove 104 is used for welding with the sealing sheet 107.

[0047] like Figure 6 As shown, the sealing nail 108 also includes an anti-slip portion 203, and the anti-slip portion 203 and the pressing portion 201 are respectively connected to the two ends of the plug-in portion 202, and the anti-slip portion 203 is located in the chamber (the anti-slip portion 203 is located below the bottom surface of the top cover 103). The anti-slip portion 203 is elastic so that the anti-slip portion 203 passes through the injection hole 109 and enters the chamber. For example, the anti-slip portion 203 can be made of elastic plastic. The end of the anti-slip portion 203 close to the plug-in portion 202 is the abutment end, Figure 6In the figure, the abutting end is the top of the anti-detachment part 203. The outer diameter of the abutting end is larger than the aperture of the injection hole 109, and the side surface of the top cover 103 facing the chamber abuts against the end surface of the abutting end, that is, the bottom surface of the top cover 103 abuts against the top surface of the abutting end. The anti-detachment part 203 is equivalent to a barb structure, and the abutting end and the top cover 103 abut against each other to hinder the sealing pin 108 from moving outward, thereby preventing the sealing pin 108 from completely detaching from the injection hole 109, and improving the sealing effect of the sealing pin 108 on the injection hole 109. In addition, as Figure 4 As shown, the anti-slip portion 203 and the pressing portion 201 clamp the sealing sheet 107 and the top cover 103 together, and the anti-slip portion 203 can prevent the sealing pin 108 from moving outward, so the sealing pin 108 is not easy to loosen, and the pressing portion 201 can press the sealing sheet 107 to prevent the sealing sheet 107 from deviating.

[0048] In some embodiments, the diameter (outer diameter) of the anti-detachment portion 203 gradually decreases from the end of the anti-detachment portion 203 close to the pressing portion 201 to the end of the anti-detachment portion 203 away from the pressing portion 201. Figure 6 For example, the diameter of the anti-slip portion 203 gradually decreases from the top end of the anti-slip portion 203 to the bottom end of the anti-slip portion 203. This arrangement facilitates the insertion of the anti-slip portion 203 into the injection hole 109 and passing through the injection hole 109. More specifically, the anti-slip portion 203 can be truncated cone-shaped.

[0049] The dimensions of the sealing pin 108 and the sealing sheet 107 are described below.

[0050] In some embodiments, the anti-detachment portion 203 is truncated, the pressing portion 201 and the plug-in portion 202 are both cylindrical, the sealing sheet 107 is cylindrical, and the receiving groove 301 is a circular groove. However, in other embodiments, the sealing pin 108 and the sealing sheet 107 can also be set to other shapes, which are not listed here. Figure 6As shown, the diameter of the pressing part 201 is B, the diameter of the plug-in part 202 is C, and the area of ​​the pressing part 201 used to press the sealing sheet 107 is positively correlated with the difference between B and C. In order to enable the pressing part 201 to stably press the sealing sheet 107, B and C satisfy: BC ≥ 0.5 mm. The maximum diameter of the anti-slip part 203 is F, the minimum diameter of the anti-slip part 203 is E, and the height of the anti-slip part 203 is K. E can be equal to C, while F is greater than C and less than B, and K satisfies: 1.2mm ≤ K ≤ 10mm. The specific value of K is adjusted according to the battery cell between the bottom surface of the top cover 103 and the battery cell, as long as the anti-slip part 203 does not squeeze the battery cell and cause damage to the battery cell. The angle between the top surface and the side surface of the anti-slip part 203 is α, α ≥ 30°. When the anti-slip part 203 passes through the injection hole 109, the hole wall of the injection hole 109 will squeeze the anti-slip part 203, so that the anti-slip part 203 will shrink toward its own central axis; α≥30° facilitates the anti-slip part 203 to shrink when passing through the injection hole 109, thereby facilitating the anti-slip part 203 to pass through the injection hole 109.

[0051] like Figure 7 As shown, the outer diameter of the sealing sheet 107 is A, B<A≤50mm. The thickness of the sealing sheet 107 (i.e., the height of the sealing sheet 107) is J, and the thickness of the receiving groove 301 (i.e., the height of the receiving groove 301) is H, H≥0.5J. Figure 5 As shown, the diameter of the receiving groove 301 is larger than the diameter of the pressing part 201, and the difference between the diameter of the receiving groove 301 and the diameter of the pressing part 201 is 2D. After the bottom surface of the pressing part 201 is attached to the bottom wall of the receiving groove 301, the height difference between the bottom surface of the sealing sheet 107 and the top surface of the anti-detachment part 203 is G, and G should not be less than the thickness of the clamped portion of the top cover 103.

[0052] The battery 100 in any of the above embodiments may be used in a battery pack, which may include a box and a plurality of batteries 100, wherein the battery 100 is disposed in the box, and the plurality of batteries 100 in the box are connected in series. The battery pack may provide power for an electric vehicle.

[0053] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery, characterized in that include: Battery cells; case; A top cover, wherein the top cover is provided with mutually communicating injection holes, the top cover is connected to the shell, the top cover and the shell together define a chamber, and the battery cell is arranged in the chamber; A sealing nail, the sealing nail comprising an inserting portion and a pressing portion, the inserting portion is arranged in the injection hole, the pressing portion is connected to an end of the inserting portion away from the battery core, and the pressing portion is located outside the cavity; A sealing sheet, wherein the plug-in portion penetrates the sealing sheet, the sealing sheet is located outside the cavity, and the pressing portion and the top cover clamp the sealing sheet.

2. The battery according to claim 1, characterized in that The sealing sheet is sealingly connected to the top cover, and the pressing portion is sealingly connected to the sealing sheet, so that the sealing pin and the sealing sheet seal the liquid injection hole.

3. The battery according to claim 2, characterized in that The sealing sheet is made of metal, and is welded to the top cover. The pressing part is made of plastic, and is connected to the sealing sheet by hot melting.

4. The battery according to claim 1, characterized in that The melting point of the sealing nail is not less than 120°C and not more than 200°C.

5. The battery according to claim 3, characterized in that The sealing sheet is provided with a receiving groove, the pressing part is arranged in the receiving groove, and there is a gap between the outer peripheral edge of the pressing part and the side wall of the receiving groove.

6. The battery according to claim 1, characterized in that The sealing sheet is provided with a receiving groove, the opening of the receiving groove is arranged on the top surface of the sealing sheet, the pressing part is arranged in the receiving groove, and the bottom surface of the pressing part is in contact with the bottom wall of the receiving groove.

7. The battery according to claim 6, characterized in that The top surface of the pressing portion is flush with the top surface of the sealing sheet, or the top surface of the pressing portion is lower than the top surface of the sealing sheet.

8. The battery according to claim 1, characterized in that The sealing sheet also includes an anti-slip portion, which is elastic and located in the chamber. The anti-slip portion and the pressing portion are respectively connected to the two ends of the plug-in portion. The end of the anti-slip portion close to the plug-in portion is a butt end, and the outer diameter of the butt end is larger than the aperture of the injection hole. A side surface of the top cover facing the chamber abuts against the end face of the butt end.

9. The battery according to claim 8, characterized in that The diameter of the anti-slip portion gradually decreases from one end of the anti-slip portion close to the pressing portion to one end of the anti-slip portion far from the pressing portion.

10. A battery pack, characterized in that: Comprising the battery as claimed in any one of claims 1 to 9.

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