Battery top cover assembly and battery

Abstract

The utility model relates to a battery top cover assembly and a battery, the battery top cover assembly comprises a welding piece and a pole, the welding piece is provided with a through hole, the pole penetrates through the through hole and is connected with the welding piece, the pole is sleeved with a sealing ring, the sealing ring is arranged in the through hole and is located between the pole and the welding piece, and the sealing ring is connected with the welding piece. A step face opposite to the sealing ring is arranged in the through hole, the step face is located above the sealing ring, an ejector pin extending towards the sealing ring is arranged on the step face, an air leakage detecting bag is arranged on the side, facing the ejector pin, of the sealing ring, and a preset distance is formed between the air leakage detecting bag and the ejector pin end of the ejector pin. In the baking process of the battery, the gas leakage detection bag expands after being heated, the ejector pin can pierce the gas leakage detection bag in the expansion process of the gas leakage detection bag so as to release gas, and the gas leakage detection device can improve the gas leakage detection accuracy of the battery.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a battery top cover assembly and a battery having the battery top cover assembly. Background Art

[0002] With the rapid development of science and technology, batteries, as key energy supply devices in various electronic devices, are becoming increasingly important. In the battery design process, safety and reliability are always the core considerations, which are directly related to the use effect of the battery and the overall performance of the device.

[0003] As an important part of the battery structure, the sealing performance of the battery top cover assembly is particularly critical. The sealing performance directly affects the stability of the electrolyte inside the battery and the isolation effect of the battery from the external environment. In the vertical welding process of the battery, the seam welding of the pole and the adapter in the battery top cover assembly is an important process. Sealing rings are usually set at the seam welding to ensure good sealing, but this design brings challenges to the gas leakage detection work before the battery leaves the factory.

[0004] Taking square aluminum shell batteries as an example, in the production process, welding of the battery cell and the battery top cover is an indispensable link. The battery top cover is usually provided with a small diameter injection port to connect the inside and outside of the battery. In the gas (such as helium) leak detection process of the battery, this injection port is usually used to detect whether there is gas leakage. For example, helium can be injected into the battery through the injection port, and helium leakage can be detected around the outside of the battery; or the outside of the battery can be filled with helium to detect whether helium enters the battery. When the battery includes a pole seam welding process, on the one hand, due to the long distance between the injection port and the pole seam weld, the diffusion capacity of helium in the battery is limited, which may make it difficult to effectively detect the poor welding of the pole seam weld; on the other hand, in order to ensure the sealing and prevent the electrolyte from corroding the pole ear, a sealing ring is usually installed on the pole. Although this design enhances the sealing, it further hinders the helium from reaching the pole seam weld from the injection port, making the gas leak detection work more difficult.

[0005] In addition, if there is no sealing ring, the electrolyte may penetrate into the tiny gap between the battery cell and the pole, which will not only affect the electrical performance of the battery, but also corrode the battery structure, thus shortening the battery life. Although the existing battery top cover assembly design ensures good sealing, it has the problem of low accuracy in gas leakage detection of the battery. Utility Model Content

[0006] The technical problem to be solved by the present application is to provide a battery top cover assembly and a battery, which can improve the accuracy of gas leakage detection of the battery.

[0007] The technical solution adopted by the present application to solve the above-mentioned technical problems is a battery top cover assembly, comprising: a welding part and a pole, the welding part is provided with a through hole, the pole passes through the through hole and is connected to the welding part, a sealing ring is sleeved on the pole, the sealing ring is arranged in the through hole and is located between the pole and the welding part, the through hole has a step surface arranged opposite to the sealing ring, the step surface is located above the sealing ring, a ejector pin extending toward the sealing ring is arranged on the step surface, a leak detection air bag is arranged on the side of the sealing ring facing the ejector pin, and a preset distance is provided between the leak detection air bag and the ejector pin end of the ejector pin.

[0008] In one embodiment of the present application, the leak detection air bag is a helium air bag, which is pre-filled with helium. The leak detection air bag can expand after being heated, and the ejector pin is used to puncture the leak detection air bag during the expansion process of the leak detection air bag to release the helium.

[0009] In one embodiment of the present application, the ejector length L of the ejector satisfies the relationship: 0.05 mm≤L≤5 mm, where mm represents millimeters.

[0010] In one embodiment of the present application, the leak detection air bag is in a circular ring shape, and the leak detection air bag is sleeved on the pole. A plurality of ejector pins are arranged on the step surface, and the plurality of ejector pins are evenly distributed along the circumference of the leak detection air bag.

[0011] In one embodiment of the present application, the end of the ejector pin is configured to be any one of a conical shape, a flat shape, and a hemispherical shape.

[0012] In one embodiment of the present application, the ejector pin is a metal steel pin or a metal aluminum pin.

[0013] In one embodiment of the present application, the preset spacing H satisfies the relationship: 0.05 mm≤H≤1.5 mm, where mm represents millimeter.

[0014] In one embodiment of the present application, a welding portion is further included, and the pole is connected to the welding piece via the welding portion.

[0015] In one embodiment of the present application, a side of the through hole away from the sealing ring further has a step portion, the pole and the step portion together form a groove, and the weld mark is located in the groove.

[0016] In order to solve the above technical problems, the present application also proposes a battery, including a battery cell, a shell and the battery top cover assembly as described above, wherein the battery cell is accommodated in the shell, and the battery top cover assembly is connected to the battery cell and the shell.

[0017] The technical solution of the present application can maintain the stability of the electrical connection inside the battery and reduce the battery performance degradation or safety risks caused by loose connection by connecting the pole to the welding part; by sleeved sealing ring on the pole, electrolyte or other substances can be prevented from entering the gap between the pole and the welding part, thereby ensuring the stability of the internal environment of the battery and improving the safety of the battery; by arranging a pin extending toward the sealing ring on the step surface of the through hole, and arranging a leak detection air bag on the sealing ring, so that during the battery baking process, the leak detection air bag expands due to heat and the pin can pierce the leak detection air bag to release gas, and the sealing performance of the battery pole can be effectively detected by detecting the gas leakage outside the battery; by setting a preset distance between the leak detection air bag and the end of the pin, it can be avoided that the pin pierces the leak detection air bag in advance during the battery assembly process, thereby ensuring the accuracy of gas detection. The battery top cover assembly of the present application is equivalent to the structural design of the detection pole seal, which can improve the accuracy of gas leakage detection of the battery and enhance the safety and stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 is a top view of a battery top cover assembly according to an embodiment of the present application;

[0020] Figure 2 is along Figure 1 The cross-sectional structural diagram of the AA' line shown in FIG.

[0021] Figure 3 is a cross-sectional view of a battery top cover assembly according to an embodiment of the present application, Figure 3 The state of the leak detection air bag when it is not inflated is shown in FIG.

[0022] Figure 4 is a cross-sectional view of a battery top cover assembly according to another embodiment of the present application, Figure 4 The state of the leak detection air bag after expansion is shown in FIG.

[0023] Figure 5 is an exploded view of a battery top cover assembly according to an embodiment of the present application;

[0024] Figure 6 is a schematic diagram of the positional relationship between the ejector pin and the leak detection air bag when they are not in contact in one embodiment of the present application;

[0025] Figure 7 is a schematic diagram of a structure in which the end of the ejector pin is tapered in one embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of a structure in which the end of the ejector pin is flat in one embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of the structure in which the end of the ejector pin is hemispherical in one embodiment of the present application.

[0028] Description of the accompanying drawings in the specific implementation manner:

[0029] 100. Battery; 101. Through hole; 1011. Step surface; 1012. Step portion; 1013. Groove; 102. Battery top cover assembly; 1021. Welding piece; 10211. Top cover plate; 10212. Explosion-proof valve; 10213. Liquid filling port; 1022. Pole; 1023. Sealing ring; 1024. Ejector pin; 10241. Ejector pin end; 1025. Leak detection air bag; 10251. Helium; 1026. Welding stamp; 1027. Upper plastic; 1028. Lower sealing ring; 1029. Lower plastic; L. Ejector pin length; H. Preset spacing; C. Circumference of the leak detection air bag. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0032] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0033] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0036] Below, the embodiments of the present application are described based on the accompanying drawings. However, the embodiments shown below are examples of battery top cover assemblies and batteries for concretizing the technical ideas of the present application, and the battery top cover assemblies and batteries of the present application are not specific to the following contents. Furthermore, in order to facilitate the understanding of the scope of the claims, this specification assigns numbers corresponding to the components shown in the embodiments to the components shown in the "Claims" and "Application Contents" columns. However, the components shown in the claims are by no means specific to the components of the embodiments. In particular, the size, material, shape, and relative configuration of the constituent components recorded in the embodiments, if there is no specific record, is not intended to limit the scope of the present application to this, but is just an illustrative example.

[0037] However, the dimensions or positional relationships of the components shown in the drawings are sometimes exaggerated for the purpose of clarifying the description. Furthermore, in the following description, for the same names and symbols, representing the same or homogeneous components, it is appropriate to omit their detailed description. Furthermore, the various elements constituting the present application may be in the form of a plurality of elements constituted by the same components so that one component serves as a plurality of elements, or conversely, it may be realized by a plurality of components sharing the function of a component. In addition, the contents described in some embodiments and implementation methods may also be utilized in other embodiments, implementation methods, etc. In addition, in this specification, "on" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately on the upper surface, and is also used to include the meaning of the existence of an intervening layer between layers.

[0038] The present application proposes a battery top cover assembly, which can be used in scenarios where the effect of the battery pole seam welding needs to be detected, such as performing gas leak detection before the battery leaves the factory.

[0039] Here, the battery structure of the present application is briefly introduced to help understand the battery top cover assembly introduced later in the present application.

[0040] Figure 1 is a top view of a battery top cover assembly according to an embodiment of the present application; Figure 2 is along Figure 1 The cross-sectional structure diagram of the AA' line shown in FIG. Figure 1 and Figure 2 As shown, the embodiment of the present application discloses a battery 100, including a battery cell (not shown), a shell (not shown) and a battery top cover assembly 102 as described later, the battery cell is accommodated in the shell, and the battery top cover assembly 102 is connected to the battery cell and the shell. For example, the overall structure of the battery 100 is not shown in the drawings of the present application. Figure 2 1 shows a partial structure of the battery top cover assembly 102. The battery top cover assembly 102 is provided with a top cover plate 10211, an explosion-proof valve 10212, a liquid injection port 10213, an upper plastic 1027, a lower sealing ring 1028, and a lower plastic 1029.

[0041] Exemplarily, the top cover plate 10211 can be set to cover the top of the shell of the battery 100, and the top cover plate 10211 can protect the battery cells inside the battery 100 from physical damage such as external impact or scratches. The explosion-proof valve 10212 and the injection port 10213 are set on the top cover plate 10211. The explosion-proof valve 10212 is a safety device that can prevent the battery 100 from exploding. When the battery 100 is overcharged or over-discharged, excessive hydrogen and other gases may be generated, causing the internal pressure of the battery 100 to increase. At this time, the explosion-proof valve 10212 will automatically open and release excess gas pressure and electrolyte to reduce pressure and protect the battery 100 to prevent the battery 100 from exploding. The injection port 10213 can be used to inject electrolyte or gas. For example, during the manufacturing or maintenance process of the battery 100, an appropriate amount of electrolyte is injected into the battery 100 through the injection port 10213 to ensure the normal operation of the battery 100; the gas generated when the battery 100 is working will be discharged through the small hole of the injection port 10213 to ensure that the appropriate air pressure is maintained inside the battery 100 to ensure its normal operation.

[0042] Continue to refer Figure 2 As shown, exemplarily, the welding piece 1021 is arranged above the top cover plate 10211, and the upper plastic 1027 is arranged between the welding piece 1021 and the top cover plate 10211; the lower plastic 1029 is arranged on the side below the top cover plate 10211 facing the battery cell; a top cover through hole (not shown) is provided on the top cover plate 10211, and the pole 1022 passes through the top cover through hole, and the lower sealing ring 1028 is sleeved on the pole 1022 and is located between the pole 1022 and the top cover plate 10211, and the lower sealing ring 1028 is used to seal and insulate the pole 1022 and the top cover plate 10211. The upper plastic 1027, the lower sealing ring 1028 and the lower plastic 1029 all have good insulation properties, which can prevent the battery 100 from current leakage or short circuit during operation, thereby ensuring the safe operation of the battery 100, and can also effectively prevent dust and moisture outside the battery 100 from invading the inside of the battery 100, which can improve the service life of the battery 100. An insulating polymer material (not shown) can be provided between the pole 1022 and the top cover plate 10211 to prevent the pole 1022 and the top cover plate 10211 from being connected, thereby preventing the positive and negative electrodes of the battery 100 from being connected, and avoiding the occurrence of a short circuit of the battery 100. The above are all conventional settings and will not be described in detail here.

[0043] The battery top cover assembly 102 of the present application will be introduced below.

[0044] Figure 3 is a cross-sectional view of a battery top cover assembly according to an embodiment of the present application, Figure 3 The state of the leak detection air bag when it is not inflated is shown in FIG. Figure 5 is an exploded view of a battery top cover assembly according to an embodiment of the present application; Figure 6Schematic diagram of the positional relationship between the ejector pin and the leak detection air bag when they are not in contact in one embodiment of the present application. Figure 3 , Figure 5 , Figure 6 As shown, the battery top cover assembly 102 of this embodiment includes: a welding piece 1021 and a pole 1022, the welding piece 1021 is provided with a through hole 101, the pole 1022 passes through the through hole 101 and is connected to the welding piece 1021, a sealing ring 1023 is sleeved on the pole 1022, the sealing ring 1023 is arranged in the through hole 101 and is located between the pole 1022 and the welding piece 1021, the through hole 101 has a step surface 1011 arranged opposite to the sealing ring 1023, the step surface 1011 is located above the sealing ring 1023, a ejector pin 1024 extending toward the sealing ring 1023 is arranged on the step surface 1011, a leak detection air bag 1025 is arranged on the side of the sealing ring 1023 facing the ejector pin 1024, and a preset spacing H is provided between the leak detection air bag 1025 and the ejector pin end 10241 of the ejector pin 1024.

[0045] For example, Figure 5 The shape of the through hole 101 is roughly framed by a dotted line, and the shape of the through hole 101 can be set according to actual needs. The pole 1022 and the welding piece 1021 can be made of metal aluminum, and the pole 1022 can also be set as a copper-aluminum composite pole.

[0046] The technical solution of the present application can maintain the stability of the electrical connection inside the battery 100 and reduce the performance degradation or safety risk of the battery 100 that may be caused by loose connection by connecting the pole 1022 with the welding piece 1021; by arranging the sealing ring 1023 on the pole 1022, it can prevent the electrolyte or other substances from entering the gap between the pole 1022 and the welding piece 1021, thereby ensuring the stability of the internal environment of the battery 100 and improving the safety of the battery 100; by arranging the ejector pin 1023 extending toward the sealing ring 1023 on the step surface 1011 of the through hole 101, 024, and at the same time, a leak detection bag 1025 is set on the sealing ring 1023, so that during the baking process of the battery 100, the leak detection bag 1025 expands due to heat, and the ejector pin 1024 can pierce the leak detection bag 1025 to release gas. By detecting the leakage of gas outside the battery 100, the sealing performance of the battery pole 1022 can be effectively detected; by setting a preset spacing H between the leak detection bag 1025 and the ejector pin end 10241, it can be avoided that the ejector pin 1024 pierces the leak detection bag 1025 in advance during the assembly process of the battery 100, thereby ensuring the accuracy of gas detection. The battery top cover assembly 102 of the present application is equivalent to the structural design of the detection pole seal, which can improve the accuracy of gas leakage detection of the battery 100 and enhance the safety and stability of the battery 100.

[0047] Figure 4is a cross-sectional view of a battery top cover assembly according to another embodiment of the present application, Figure 4 The figure shows the state of the leak detection bag after it is inflated. Figure 3 , Figure 4 , Figure 6 As shown, in some embodiments, the leak detection air bag 1025 is a helium air bag, which is pre-filled with helium 10251. The leak detection air bag 1025 can expand after being heated, and the ejector pin 1024 is used to puncture the leak detection air bag 1025 during the expansion process of the leak detection air bag 1025 to release the helium 10251.

[0048] For example, it can be considered that after the battery 100 of the present application is assembled, the space between the leak detection air bag 1025 and the ejector end 10241 of the ejector 1024 is as follows: Figure 3 As shown; after the leak detection air bag 1025 is heated and expanded during the baking process of the battery 100, the space between the leak detection air bag 1025 and the ejector end 10241 of the ejector 1024 is as shown Figure 4 As an inert gas, helium has the characteristics of stable chemical properties and is not easy to react chemically with other substances. The present application uses a helium air bag as the leak detection air bag 1025 to more accurately detect the sealing performance of the battery top cover assembly 102.

[0049] refer to Figure 6 As shown, in some embodiments, the ejector pin length L of the ejector pin 1024 satisfies the relationship: 0.05mm≤L≤5mm, where mm represents millimeter. For example, the ejector pin length L can be 0.05mm, 1mm, 2.5mm, 5mm, etc., and this application does not limit this. A suitable ejector pin length L can be selected according to actual needs to meet the detection requirements of battery top cover assemblies 102 of different specifications and requirements.

[0050] In some embodiments, the leak detection air bag 1025 is in a circular shape and is sleeved on the pole 1022 . A plurality of ejector pins (greater than or equal to 2) are arranged on the step surface 1011 . The plurality of ejector pins 1024 are evenly distributed along the circumference of the leak detection air bag 1025 .

[0051] For example, reference Figure 1 As shown, the circumference of the leak detection air bag 1025 can be understood as Figure 1 In the direction C shown in FIG. 1 , by evenly distributing multiple ejector pins 1024 along the circumference of the leak detection air bag 1025, it is ensured from all directions that the leak detection air bag 1025 can directly contact at least one ejector pin 1024 after being heated and expanded, and thus be punctured by the ejector pin 1024, thereby improving the accuracy and reliability of the detection. In practical applications, the number of ejector pins 1024 on the step surface 1011 can be one, and this application does not limit this.

[0052] Figure 7is a schematic diagram of a structure in which the end of the ejector pin is tapered in one embodiment of the present application; Figure 8 This is a schematic diagram of a structure in which the end of the ejector pin is flat in one embodiment of the present application; Fig. 9 Schematic diagram of the structure in which the end of the ejector pin is hemispherical in one embodiment of the present application. Figures 7 to 9 As shown, in some embodiments, the ejector pin end 10241 is configured to be conical (eg Figure 7 As shown), flat (as Figure 8 As shown), hemispherical (as Fig. 9 As shown in any one of the above). Exemplarily, the ejector end 10241 is the portion of the ejector 1024 that is closest to the leak detection air bag 1025. Setting the ejector end 10241 to a cone shape can make the leak detection air bag 1025 more easily punctured by the ejector 1024, thereby improving the efficiency and accuracy of the puncture; setting the ejector end 10241 to a flat shape or a hemispherical shape can make the leak detection air bag 1025 less likely to be punctured by the ejector 1024 during the assembly process of the battery 100, thereby improving the assembly yield rate of the battery 100. In practical applications, the ejector end 10241 can be set to a suitable shape as needed. For example, the ejector ends 10241 of multiple ejectors 1024 can be set to the same shape or different shapes, which is not limited in the present application.

[0053] In some embodiments, the ejector pin 1024 is a metal steel pin or a metal aluminum pin. For example, both materials have good hardness and toughness, which can ensure that the ejector pin 1024 will not break or deform when puncturing the leak detection air bag 1025.

[0054] refer to Figure 6 As shown, in some embodiments, the preset spacing H satisfies the relationship: 0.05mm≤H≤1.5mm, where mm represents millimeters. Exemplarily, the preset spacing H can be set to 0.05mm, 0.08mm, 1mm, 1.3mm, 1.5mm, etc., and this application does not impose any restrictions. By setting the preset spacing H, during the assembly of the battery 100, it is possible to prevent the ejector pin 1024 from puncturing the leak detection air bag 1025 in advance due to misoperation, and it is also possible to ensure that the ejector pin 1024 can successfully puncture the leak detection air bag 1025 when the leak detection air bag 1025 expands to a certain extent.

[0055] In some embodiments, the material of the leak detection air bag 1025 includes one of PET, PVC, PE, and EVOH, or any combination thereof. For example, PET (Poly Ethylene Terephthalate) is polyethylene terephthalate, commonly known as polyester resin; PVC (Polyvinyl Chloride) is polyvinyl chloride; PE (Polyethylene) is polyethylene; EVOH (PolyEthylene Vinyl Alcohol) is polyethylene vinyl alcohol. A material with good air tightness and heat resistance can be selected to prepare the leak detection air bag 1025, thereby ensuring that the leak detection air bag 1025 remains stable under normal working conditions and can expand smoothly when heated.

[0056] refer to Figure 3 As shown, in some embodiments, the battery top cover assembly 102 further includes a weld stamp 1026, and the pole 1022 is connected to the weld 1021 through the weld stamp 1026. Exemplarily, the weld stamp is a fixed connection form formed between the weld 1021 and the pole 1022 by a welding process, and the weld stamp can tightly combine the weld 1021 with the pole 1022 to form a stable and inseparable whole. The present application connects the pole 1022 and the weld 1021 by providing a weld stamp 1026, which can make the overall connection of the battery top cover assembly 102 more stable, firm, and reliable, and can effectively prevent the pole 1022 and the weld 1021 from loosening and falling off.

[0057] refer to Figures 3 to 5 As shown, in some embodiments, a side of the through hole 101 away from the sealing ring 1023 further has a step portion 1012, and after the pole 1022 and the welding piece 1021 are connected, the pole 1022 and the step portion 1012 together form a groove 1013, and the weld stamp 1026 is located in the groove 1013. Exemplarily, by arranging the weld stamp 1026 in the groove 1013, a part of the groove space can be reserved above the weld stamp 1026, and a battery leakage detection device can be placed in the groove space later, so as to facilitate the subsequent detection of gas leakage.

[0058] For example, specifically, the present application is configured to connect the pole 1022 to the welding piece 1021 through the welding stamp 1026, and its beneficial effects are mainly reflected in the following aspects:

[0059] (1) Stable electrical connection: The weld connection ensures that the electrical connection between the pole 1022 and the weld 1021 is stable and reliable, so that the current can be smoothly transmitted from the pole 1022 to other parts of the battery 100, ensuring the normal operation and performance of the battery 100.

[0060] (2) Enhanced mechanical strength: The weld connection makes the connection between the pole 1022 and the weld 1021 more secure, thereby enhancing the mechanical strength of the battery top cover assembly 102. This strong connection can effectively resist external shocks and vibrations, thereby improving the durability and reliability of the battery 100.

[0061] (3) Improved sealing performance: By connecting the weld stamp 1026, the gap between the battery welding part 1021 and the pole 1022 is effectively sealed, thereby improving the sealing performance of the battery 100, helping to prevent the leakage of electrolyte inside the battery 100 and the entry of external impurities, thereby protecting the internal structure and performance of the battery 100.

[0062] (4) Simplified assembly process: The assembly process of the battery top cover assembly 102 is simplified by connecting the welded portion 1026, thereby improving production efficiency. Compared with other connection methods, welded connection does not require additional connectors or fasteners, thereby reducing production costs and complexity.

[0063] Although the above disclosure discusses some currently considered useful utility model embodiments through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments, but rather, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of the present application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0064] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0065] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0066] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A battery top cover assembly, characterized in that: include: A welding part and a pole, wherein the welding part is provided with a through hole, the pole passes through the through hole and is connected to the welding part, a sealing ring is sleeved on the pole, the sealing ring is arranged in the through hole and is located between the pole and the welding part, the through hole has a step surface arranged opposite to the sealing ring, the step surface is located above the sealing ring, a pin extending toward the sealing ring is arranged on the step surface, a leak detection air bag is arranged on the side of the sealing ring facing the pin, and a preset distance is provided between the leak detection air bag and the pin end of the pin.

2. The battery top cover assembly according to claim 1, characterized in that: The leak detection air bag is a helium air bag, which is pre-filled with helium. The leak detection air bag can expand after being heated, and the ejector pin is used to puncture the leak detection air bag during the expansion process of the leak detection air bag to release the helium.

3. The battery top cover assembly according to claim 1, characterized in that: The ejector length L of the ejector meets the relationship: 0.05mm≤L≤5mm, where mm represents millimeter.

4. The battery top cover assembly according to claim 1, characterized in that: The leak detection air bag is in a circular ring shape and is sleeved on the pole. A plurality of ejector pins are arranged on the step surface and are evenly distributed along the circumference of the leak detection air bag.

5. The battery top cover assembly according to claim 1, characterized in that: The end of the ejector pin is configured to be any one of a conical shape, a flat shape, and a hemispherical shape.

6. The battery top cover assembly according to claim 1, characterized in that: The ejector pin is a metal steel pin or a metal aluminum pin.

7. The battery top cover assembly according to claim 1, characterized in that: The preset spacing H satisfies the relationship: 0.05 mm ≤ H ≤ 1.5 mm, where mm represents millimeters.

8. The battery top cover assembly according to claim 1, characterized in that: It also includes a welding portion, and the pole is connected to the welding piece through the welding portion.

9. The battery top cover assembly according to claim 8, characterized in that: A side of the through hole away from the sealing ring also has a step portion, the pole and the step portion together form a groove, and the weld mark is located in the groove.

10. A battery, characterized in that: It comprises a battery cell, a shell and a battery top cover assembly as described in any one of claims 1 to 9, wherein the battery cell is accommodated in the shell, and the battery top cover assembly is connected to the battery cell and the shell.

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