Battery liquid injection hole sealing structure, battery cover plate and battery

Abstract

The utility model relates to a battery liquid injection hole sealing structure, a battery cover plate and a battery, the battery liquid injection hole sealing structure is suitable for the battery cover plate and the battery comprising the battery cover plate, the battery liquid injection hole sealing structure comprises a waterproof ventilation part and a sealing part, the waterproof ventilation part is arranged at a liquid injection hole of the battery cover plate and shields the liquid injection hole; the sealing piece is arranged on the side, away from the liquid injection hole, of the waterproof ventilation piece and used for sealing the inlet end of the liquid injection hole. According to the application, the waterproof breathable part is adopted to replace a traditional sealing rubber nail, so that helium can penetrate through the waterproof breathable part from the interior of the battery cell and enter the space between the waterproof breathable part and the sealing part, and therefore, when helium detection equipment detects that helium exists at the liquid injection hole of the battery, the helium can be conveniently injected into the liquid injection hole; helium leakage caused by reduction of the sealing performance of the sealing element at the battery liquid injection hole can be accurately judged, and the battery is judged as a defective battery, so that the accuracy and the reliability of a detection result of the sealing performance of the battery liquid injection hole are ensured.

Description

Technical Field

[0001] The present application relates to the field of new energy battery technology, and in particular to a battery filling hole sealing structure, a battery cover, and a battery. Background Art

[0002] In the lithium battery production process, after the secondary liquid filling of the aluminum shell battery is completed, the battery needs to be sealed. Before sealing, a certain amount of helium or other special gases need to be injected into the battery so that after the sealing is completed, the battery's sealing can be tested by detecting whether there is gas leakage at the liquid filling hole of the battery.

[0003] In the related art, the method for sealing the battery filling hole is usually: first insert a sealing nail into the battery filling hole, pump negative pressure into the battery cell and fill it with helium, press the sealing nail until it is flush with the filling hole, then cover the filling hole with a sealing aluminum nail, and perform laser welding.

[0004] However, the sealing nails in the related technology are interference fit with the liquid injection hole, so that the helium filled in the battery cannot leak out. Even if there is a problem in the welding process of the metal sealing cover, the helium detection equipment will determine that the problem battery is a qualified battery. However, the sealing nails of the problem battery are prone to loosening during long-term transportation and use, causing battery leakage, posing a major safety hazard. Utility Model Content

[0005] Based on this, it is necessary to provide a battery filling hole sealing structure, a battery cover and a battery to address the problem that the battery filling hole is sealed with a sealing nail, which leads to errors in the judgment results of battery safety.

[0006] In a first aspect, the present application provides a battery filling hole sealing structure, applicable to a battery cover and a battery including the battery cover, comprising:

[0007] A waterproof and breathable member is provided at the injection hole of the battery cover to cover the injection hole;

[0008] The sealing member is arranged on a side of the waterproof and breathable member away from the liquid injection hole, and is used for sealing the inlet end of the liquid injection hole.

[0009] In one embodiment, the waterproof breathable member includes a waterproof breathable membrane, which is used to allow helium inside the battery to pass through while sealing the electrolyte inside the battery.

[0010] In one embodiment, the waterproof breathable membrane is a semi-permeable membrane, and a plurality of micropores are provided on the semi-permeable membrane.

[0011] In one embodiment, the diameter of the micropores is 0.01 μm to 600 μm.

[0012] In one embodiment, the waterproof breathable membrane is provided with an adhesive portion, which is used to fix the waterproof breathable membrane to the liquid injection hole, so that the waterproof breathable membrane can shield the inlet end of the liquid injection hole.

[0013] In one embodiment, the thickness of the bonding portion is 0.02-0.05 mm.

[0014] In one embodiment, the sealing member includes a sealing metal nail, which is used to seal the waterproof and breathable membrane, and the sealing metal nail is fixedly connected to the battery cover.

[0015] In a second aspect, the present application provides a battery cover, applicable to a battery, the battery including a battery cell, the battery cover including any one of the battery filling hole sealing structures provided in the first aspect, the battery cover having a pre-reserved filling hole, and the battery cover further comprising:

[0016] positive electrode column;

[0017] The negative electrode column and the positive electrode column are connected to the adapted electrical equipment so that the battery cell can supply power to the electrical equipment;

[0018] Positive and negative electrode connectors, the positive electrode column is connected to the positive electrode of the battery cell through the positive electrode connector, and the negative electrode column is connected to the negative electrode of the battery cell through the negative electrode connector.

[0019] In one embodiment, the battery cover further includes:

[0020] A top cover piece, wherein the top cover piece is provided with explosion-proof holes;

[0021] An explosion-proof disk is arranged in the explosion-proof hole;

[0022] The insulating member is arranged at the bottom end of the top cover sheet and connected to the top cover sheet, and is used for insulating and fixing the battery core.

[0023] In a third aspect, the present application provides a battery, comprising any one of the battery cover plates provided in the second aspect, and further comprising:

[0024] The housing has an open top, a battery cover is disposed at the open end of the housing, and the battery cover and the housing form an accommodating space;

[0025] The battery cell is arranged in the accommodating space.

[0026] The battery filling hole sealing structure, battery cover and battery mentioned above, wherein the battery filling hole sealing structure is applicable to the battery cover and the battery including the battery cover, the battery filling hole sealing structure comprises a waterproof breathable member and a sealing member, the waterproof breathable member is arranged at the filling hole of the battery cover to shield the filling hole; the sealing member is arranged on the side of the waterproof breathable member away from the filling hole, and the sealing member is used to seal the entrance end of the filling hole. The battery filling hole sealing structure of the present application adopts a waterproof breathable member to replace the traditional sealing nail to shield the battery filling hole, so that helium can pass through the waterproof breathable member from the inside of the battery cell and enter between the waterproof breathable member and the sealing member. When the sealing of the battery filling hole is detected by helium detection equipment, if the sealing member is damaged or not tightly welded to the battery cover, resulting in helium leakage, the battery can be accurately determined to be a problem battery; if no helium is detected at the sealing member, it is determined that the sealing member and the battery cover are well welded and intact, and the battery is a safe battery, thereby helping to improve the accuracy and reliability of the battery safety determination results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 Schematic diagram of the structure of the battery cover in some embodiments of the present application.

[0029] Figure 2 This is a schematic diagram of an explosion structure used to illustrate the connection relationship between the bottom cover sheet, the top cover sheet, the explosion-proof sheet, the positive electrode column, the negative electrode column, and the connector in some embodiments of the present application;

[0030] Figure 3 This is a schematic cross-sectional structure diagram illustrating the connection relationship between the bottom cover sheet, the top cover sheet, the explosion-proof sheet, the positive electrode column, the negative electrode column, and the connector in some embodiments of the present application;

[0031] Figure 4 for Figure 3 Enlarged view of part A;

[0032] Figure 5 for Figure 3 Enlarged view of part B;

[0033] Figure 6 for Figure 3 Magnified view of part C.

[0034] Description of Figure Numbers:

[0035] 100. Battery filling hole sealing structure; 110. Waterproof and breathable component; 120. Sealing component; 200. Battery cover; 210. Filling hole; 220. Negative electrode column; 232. Second sealing ring; 234. Negative electrode plastic; 240. Positive electrode column; 252. First sealing ring; 254. Positive electrode plastic; 260. Top cover; 262. Explosion-proof hole; 270. Explosion-proof plate; 280. Lower plastic component; 290. Bottom cover. DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0042] In order to solve the problem in the related art that the battery filling hole 210 is sealed with a sealing nail, which leads to an error in the determination result of battery safety, firstly, referring to Figure 1 and Figure 2 An embodiment of the present application provides a battery cover 200, which is suitable for a battery. The battery includes a battery cell. A battery filling hole sealing structure 100 is provided on the battery cover 200. The battery cover 200 also includes a positive electrode column 240, a negative electrode column 220 and two connectors. The negative electrode column 220 and the positive electrode column 240 are connected to an adapted electrical device to enable the battery cell to supply power to the electrical device; one of the connectors is a positive electrode connector, and the other connector is a negative electrode connector. The positive electrode column 240 is connected to the positive electrode of the battery cell through the positive electrode connector, and the negative electrode column 220 is connected to the negative electrode of the battery cell through the negative electrode connector.

[0043] Specifically, refer to Figures 2 to 5The battery cover 200 includes a top cover sheet 260 and a bottom cover sheet 290 that fit together. The positive column 240 and the negative column 220 are both fixedly arranged on the top wall of the battery cover 200, that is, fixedly arranged on the top wall of the top cover sheet 260. The positive electrode connector includes a first sealing ring 252 and a positive electrode plastic 254. The first sealing ring 252 is used to ensure the sealing of the positive electrode connection. The first sealing ring 252 can be placed at the bottom end of the positive column 240. The positive electrode plastic 254 is used to enhance the sealing performance of the positive electrode. The positive electrode column 240 is connected to the positive electrode for stability and sealing, and the positive electrode plastic 254 is embedded in the positive electrode column 240; the negative electrode connector includes a second sealing ring 232 and a negative electrode plastic 234. The second sealing ring 232 is used to ensure the sealing of the negative electrode connection. The second sealing ring 232 can be placed at the bottom end of the negative electrode column 220. The negative electrode plastic 234 is used to enhance the stability and sealing when the negative electrode column 220 is connected to the negative electrode. The negative electrode plastic 234 is embedded in the negative electrode column 220.

[0044] Reference Figure 1 and Figure 2 In some embodiments, the battery cover 200 further includes an explosion-proof piece 270 and an insulating member. An explosion-proof hole 262 is provided on the top cover 260; the explosion-proof piece 270 is arranged in the explosion-proof hole 262; the insulating member is arranged at the bottom end of the top cover 260 and connected to the top cover 260, and the insulating member is used to insulate and fix the battery cell.

[0045] Among them, the explosion-proof hole 262 runs through the top wall of the battery cover 200, and the explosion-proof hole 262 is located between the positive electrode column 240 and the negative electrode column 220. The explosion-proof hole 262 is in the shape of a waist-shaped hole. The top wall of the battery cover 200 is also penetrated by a liquid injection hole 210, and the liquid injection hole 210 is located between the positive electrode column 240 and the explosion-proof hole 262. The explosion-proof plate 270 is welded in the explosion-proof hole 262. The insulating part includes a lower plastic part 280, which is arranged at the bottom end of the top cover sheet 260 and connected to the top cover sheet 260. The lower plastic part 280 can be made of materials such as polypropylene, polyethylene, silicone rubber, etc., so as to provide good insulation protection for the battery cell. The lower plastic part 280 can be bonded and fixed to the bottom cover sheet 290 by sealant, thereby playing a certain fixing role for the battery cell, thereby ensuring the safety and stability of the battery cell during use.

[0046] Specifically, during use, when gas is generated in the battery shell and the gas pressure of the battery shell reaches the explosion-proof threshold of the explosion-proof plate 270, the explosion-proof plate 270 ruptures and the gas is discharged from the explosion-proof hole 262, thereby preventing the battery shell from bursting.

[0047] In one embodiment, referring to Figure 3 and Figure 6The battery filling hole sealing structure 100 is suitable for the battery cover 200 and the battery including the battery cover 200. The battery filling hole sealing structure 100 includes a waterproof and breathable component 110 and a sealing component 120. The waterproof and breathable component 110 is arranged at the filling hole 210 of the battery cover 200 to shield the filling hole 210; the sealing component 120 is arranged on the side of the waterproof and breathable component 110 away from the filling hole 210, and the sealing component 120 is used to seal the entrance end of the filling hole 210.

[0048] The waterproof breathable member 110 prevents electrolyte leakage while allowing helium to pass through, allowing for subsequent sealing testing using helium testing equipment. The seal 120 seals the connection between the waterproof breathable member 110 and the injection hole 210, as well as the inlet of the injection hole 210.

[0049] Specifically, when the battery filling hole sealing structure 100 is installed and used, the waterproof breathable component 110 is first installed on the side of the battery cover 200 located at the opening end of the filling hole 210, and then the sealing component 120 is installed on the side of the waterproof breathable component 110 away from the opening end of the filling hole 210, so as to achieve sealing of the connection between the waterproof breathable component 110 and the filling hole 210 and the entrance end of the filling hole 210.

[0050] In this embodiment, the battery filling hole sealing structure 100 adopts a waterproof breathable member 110 to replace the traditional sealing nail to cover the battery filling hole 210, so that helium can pass through the waterproof breathable member 110 from the inside of the battery cell and enter between the waterproof breathable member 110 and the sealing member 120. When the sealing of the battery filling hole 210 is detected by helium detection equipment, if the sealing member 120 is damaged or not tightly welded to the battery cover 200, resulting in helium leakage, the battery can be accurately determined to be a problem battery; if no helium is detected at the sealing member 120, it is determined that the sealing member 120 and the battery cover 200 are well welded and intact, and the battery is a safe battery, which helps to improve the accuracy and reliability of the battery safety determination results.

[0051] Reference Figure 6 In some embodiments, the seal 120 includes a sealing metal nail, which is used to seal the waterproof and breathable membrane, and the sealing metal nail is fixedly connected to the battery cover 200.

[0052] The sealing metal nails are typically made of stainless steel or aluminum alloy because these materials have excellent corrosion resistance, high temperature resistance, and mechanical strength, thereby ensuring stability and safety during battery use. The sealing metal nails in this embodiment include but are not limited to sealing aluminum nails, etc. The sealing metal nails are welded to the battery cover plate 200.

[0053] Specifically, when the battery filling hole sealing structure 100 is installed and used, after the waterproof breathable component 110 is installed, the waterproof breathable membrane is covered with sealing aluminum nails and connected to the battery cover plate 200 by welding to ensure the sealing of the battery filling hole sealing structure 100.

[0054] Reference Figure 6 In some embodiments, the waterproof breathable member 110 includes a waterproof breathable membrane, which is used to allow helium inside the battery to pass through while sealing the electrolyte inside the battery.

[0055] Among them, the waterproof breathable component 110 includes but is not limited to a waterproof breathable membrane, which can be selected according to actual usage requirements. For example, the waterproof breathable component 110 can also be a waterproof breathable plug, a waterproof breathable valve, and a waterproof breathable component made of a polymer waterproof breathable material.

[0056] Specifically, the waterproof breathable membrane can prevent the electrolyte from being brought to the welding area of ​​the seal 120 when helium is pumped out, thereby protecting the welding area of ​​the seal 120 from corrosion by the electrolyte, and the waterproof breathable membrane can also allow helium to penetrate freely, that is, the waterproof breathable membrane can prevent electrolyte leakage to protect the internal structure of the battery from electrolyte corrosion while allowing helium to pass freely, so as to perform subsequent accurate sealing testing; in addition, compared with the sealing nails in traditional technology, the waterproof breathable membrane can reduce the overall weight of the battery, making the final battery more lightweight.

[0057] In some embodiments, the waterproof breathable membrane is a semipermeable membrane having a plurality of micropores provided thereon, and the diameter of the micropores is 0.01 μm to 600 μm.

[0058] The presence of the micropores allows helium to pass freely through the waterproof breathable membrane, allowing seal testing to be performed through these micropores when the fixed seal 120 is thick, thereby verifying the sealing effect of the seal 120. In addition, controlling the diameter of the micropores to between 0.01μm and 600μm helps prevent the electrolyte from seeping into the sealed area through the injection hole 210, thereby effectively protecting the internal structure of the battery from corrosion by the electrolyte.

[0059] In some embodiments, an adhesive portion is provided on the waterproof breathable membrane, and the adhesive portion is used to fix the waterproof breathable membrane to the liquid injection hole 210 to achieve shielding of the inlet end of the liquid injection hole 210 by the waterproof breathable membrane.

[0060] Among them, the adhesive portion is used to firmly fix the waterproof breathable membrane at the position of the inlet end of the liquid injection hole 210 to ensure that it will not move, deform or loosen during the entire sealing process; at the same time, the adhesive portion can effectively seal the gap around the liquid injection hole 210 to prevent helium or electrolyte from entering or leaking before installing and fixing the seal 120, thereby ensuring the effect after welding.

[0061] Specifically, the bonding portion can be formed by the drying of a sealant layer, or can be an adhesive gasket made of a material with good sealing properties such as rubber, or an adhesive patch composed of an adhesive and a backing material, or an adhesive profile such as an insulating strip or a sealing strip. The bonding portion can be disposed around the outer peripheral wall of the waterproof and breathable membrane, or a portion can be bonded and fixed to the top or bottom wall of the waterproof and breathable membrane, while the other portion is used to bond to the side wall of the battery cover 200 located on the side of the inlet end of the liquid injection hole 210.

[0062] In this embodiment, the tightness of the connection between the waterproof breathable membrane and the battery cover 200 is enhanced by the adhesive portion, thereby ensuring that the waterproof breathable membrane stably shields the inlet end of the injection hole 210, thereby further improving the waterproof breathable membrane's anti-leakage performance against electrolyte.

[0063] In some embodiments, the thickness of the bonding portion is 0.02-0.05 mm.

[0064] Specifically, setting the thickness of the bonding part within 0.02-0.05mm helps to reduce its thickness while ensuring the bonding strength of the bonding part, thereby helping to reduce the overall size and weight of the battery and improve the lightness of the battery appearance; in addition, it helps to reduce the stress concentration and impact caused by changes in the thickness of the bonding part, thereby improving the performance of the overall battery structure and reliability during long-term use.

[0065] The battery filling hole sealing structure 100 of the present application uses a waterproof breathable membrane to replace the traditional sealing glue nail to cover the battery filling hole 210, so that helium can pass through the waterproof breathable membrane from the inside of the battery cell and enter the sealing area between the waterproof breathable membrane and the sealing aluminum nail. When the helium detection equipment is used to detect the sealing of the battery filling hole 210, if the sealing aluminum nail is damaged or not welded tightly to the battery cover 200, resulting in helium leakage, the battery can be accurately determined to be a problem battery; if helium is not detected at the sealing aluminum nail, it is determined that the sealing aluminum nail is well welded to the battery cover 200 and is intact, and the battery is a safe battery, which helps to improve the accuracy and reliability of the battery safety determination results. In addition, after the battery cover 200 in the present application has the above-mentioned battery filling hole sealing structure 100, it also has the technical effect of improving the accuracy of the sealing test results at the battery filling hole 210.

[0066] On the other hand, an embodiment of the present application provides a battery, including any one of the battery cover plates 200 provided above, the battery also including a shell and a battery cell, the top of the shell is open, the battery cover plate 200 is arranged at the open end of the shell, and the battery cover plate 200 and the shell form a accommodating space; the battery cell is arranged in the accommodating space.

[0067] Among them, the accommodating space formed by the battery cover 200 and the shell can provide good packaging for the battery cells, and by accommodating the battery cells in the accommodating space, the shell can provide good support for the battery cells and protect them from external damage.

[0068] Specifically, during the battery assembly stage, the interior of the battery cell is first evacuated and helium is injected. Specifically, the battery is evacuated to -60Kpa at a rate of 5Kpa / s and the pressure is maintained for 10s; then helium is injected at a rate of 5Kpa / s to a temperature between -10Kpa and 0Kpa; then the waterproof breathable membrane is bonded to the injection hole 210; and then a sealing aluminum nail is welded to the side wall of the battery cover 200 on the side of the inlet end of the injection hole 210, thereby achieving good sealing of the connection between the waterproof breathable membrane and the injection hole 210 and the injection hole 210. When checking the sealing performance of the liquid injection hole 210 of the battery, the existing helium detection equipment can be used to detect the sealing aluminum nail. Since the waterproof breathable membrane has good air permeability, helium can freely penetrate the waterproof breathable membrane. Therefore, if helium is detected at the sealing aluminum nail, it can be proved that the sealing performance of the sealing aluminum nail has been reduced, causing helium leakage. It can also be determined that the battery is a defective battery and needs to be replaced or repaired in time, thereby ensuring the safety and reliability of the battery during use.

[0069] The battery in the present application, after being provided with the above-mentioned battery cover 200 and battery filling hole sealing structure 100, also has the technical effect of improving the accuracy of the sealing test results at the battery filling hole 210.

[0070] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" 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 present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0071] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery filling hole sealing structure, suitable for a battery cover and a battery including the battery cover, characterized in that: The battery filling hole sealing structure includes: A waterproof and breathable member, provided at the injection hole of the battery cover to cover the injection hole; A sealing member is provided on a side of the waterproof and breathable member away from the liquid injection hole, and the sealing member is used to seal the inlet end of the liquid injection hole.

2. The battery liquid filling hole sealing structure according to claim 1, characterized in that: The waterproof breathable member includes a waterproof breathable membrane, which is used to allow helium inside the battery to pass through while sealing the electrolyte inside the battery.

3. The battery liquid filling hole sealing structure according to claim 2, characterized in that: The waterproof and breathable membrane is a semi-permeable membrane, and a plurality of micropores are provided on the semi-permeable membrane.

4. The battery liquid filling hole sealing structure according to claim 3, characterized in that: The diameter of the micropores is 0.01 μm to 600 μm.

5. The battery liquid filling hole sealing structure according to any one of claims 2 to 4, characterized in that: The waterproof breathable membrane is provided with an adhesive portion, which is used to fix the waterproof breathable membrane and the liquid injection hole, so that the waterproof breathable membrane can shield the inlet end of the liquid injection hole.

6. The battery liquid filling hole sealing structure according to claim 5, characterized in that: The thickness of the bonding portion is 0.02-0.05 mm.

7. The battery liquid filling hole sealing structure according to claim 6, characterized in that: The sealing member includes a sealing metal nail, which is used to seal the waterproof and breathable membrane and is fixedly connected to the battery cover.

8. A battery cover, suitable for a battery comprising a battery cell, wherein the battery cover comprises the battery liquid filling hole sealing structure according to any one of claims 1 to 7, characterized in that: A liquid injection hole is reserved on the battery cover, and the battery cover also includes: positive electrode column; A negative electrode column, wherein the negative electrode column and the positive electrode column are connected to an adapted electrical device so that the battery cell can supply power to the electrical device; A positive electrode connector and a negative electrode connector, wherein the positive electrode column is connected to the positive electrode of the battery cell through the positive electrode connector, and the negative electrode column is connected to the negative electrode of the battery cell through the negative electrode connector.

9. The battery cover according to claim 8, characterized in that: The battery cover also includes: A top cover sheet, wherein the top cover sheet is provided with explosion-proof holes; An explosion-proof disk is arranged in the explosion-proof hole; An insulating member is arranged at the bottom end of the top cover sheet and connected to the top cover sheet, and is used to insulate and fix the battery core.

10. A battery comprising the battery cover according to any one of claims 8 to 9, characterized in that: The battery further comprises: A housing, wherein the top end of the housing is open, the battery cover is disposed at the open end of the housing, and the battery cover and the housing form an accommodating space; The battery cell is arranged in the accommodating space.

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