Top cover and connecting piece integrated structure

Abstract

The utility model belongs to the technical field of batteries, and mainly relates to a top cover and connecting piece integrated structure which comprises a pole, a body, a first plastic part, a second plastic part and a connecting piece, the body is provided with an assembly hole, and the pole corresponds to the assembly hole and is arranged on one side of the body in the thickness direction through the first plastic part. The connecting sheet is assembled on the other side of the body in the thickness direction in an insulating manner through a second plastic part; the second plastic part is provided with a transition hole corresponding to the assembly hole, the connecting sheet is provided with a convex part, and the convex part sequentially penetrates through the transition hole and the assembly hole and is welded with the pole to form an integral structure; according to the design, the welding precision of the connecting sheet and the pole is improved, and the pole cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to an integrated structure of a top cover and a connecting piece. Background Art

[0002] The top cover is a core part of the battery structure, responsible for key functions such as sealing, input and output of current, etc. Its design is crucial for the performance and cost control of the battery cell. At present, the top cover design is mainly divided into two categories: injection molding and encapsulation structure and riveting structure. Different structures affect the assembly complexity and performance, and thus affect the cost.

[0003] For the stability of the battery structure, in the prior art, the connecting piece often adopts a laser welding process to connect with the pole column on the battery cover plate. However, in the existing battery structure, the pole column and the connecting piece are usually brought into contact first, and then laser welding is performed on the main body part of the connecting piece. This design increases the cost of the pole column material, and also increases the complexity and cost of the welding and installation process, reducing the installation efficiency; in addition, in the welding process of the existing top cover structure, it is very easy to be affected by the solder, resulting in voids and false soldering in the stability of the connection between the connecting piece and the pole column.

[0004] Based on this, it is urgent to improve the existing top cover structure and its assembly method to solve the defects existing in the foregoing technologies. Summary of the Utility Model

[0005] The purpose of the utility model is to optimize the existing top cover structure in view of the deficiencies that in the welding and installation process of the connecting piece and the pole column in the existing top cover structure, it is necessary to rely on a positioning tooling part, resulting in high complexity of the welding process by the welding equipment and easy occurrence of false soldering, missed soldering, etc.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An integrated structure of a top cover and a connecting piece, comprising a pole column, a first plastic part, a main body, a second plastic part and a connecting piece. The main body has an assembly hole, the pole column corresponds to the assembly hole and is arranged on one side of the main body in the thickness direction through the first plastic part, and the connecting piece is insulatingly assembled on the other side of the main body in the thickness direction through the second plastic part; the second plastic part has a transition hole corresponding to the assembly hole, the connecting piece has a convex part, and the convex part sequentially passes through the transition hole and the assembly hole and is welded to the pole column to form an integrated structure.

[0008] The above-mentioned integrated structure of a top cover and a connecting piece proposed by the utility model has the following technical effects:

[0009] By integrating the connecting piece and the terminal post on the same body, with the connecting piece and the terminal post located on both sides of the body respectively, the need for complex positioning tooling during the welding process of the connecting piece and the terminal post in the prior art is avoided, the assembly process is simplified, the assembly cost is reduced, and the production efficiency is improved. At the same time, since the connecting piece and the terminal post are insulated and assembled with the body through plastic parts, the influence of solder on the connection stability between the connecting piece and the terminal post during the welding process can be effectively avoided, the risks of false soldering and missed soldering are reduced, and the stability and reliability of the battery structure are improved.

[0010] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, the first plastic part includes a first plastic body and a mounting hole formed by the first plastic body. The column body is arranged in the mounting hole. The first plastic body has a first chamfer, and the column body has a second chamfer, and the second chamfer is installed corresponding to the first chamfer.

[0011] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, the second plastic part includes a second plastic body and an isolation part connected to the second plastic body and arranged around the edge of the transition hole. The isolation part is placed in the assembly hole and closely adheres to the body.

[0012] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, the connecting piece includes a sheet body connected to the convex part. A fuse piece is arranged in the sheet body, and the sheet body closely adheres to the second plastic body.

[0013] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, an insulator is further arranged between the connection of the assembly hole and the first plastic part.

[0014] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, an explosion-proof valve hole is arranged beside the assembly hole on the body, and an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

[0015] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, the explosion-proof valve assembly includes an explosion-proof valve and a protection patch. The explosion-proof valve is arranged in the explosion-proof valve hole, and the protection patch is arranged on the side of the explosion-proof valve away from the second plastic part.

[0016] As an improvement to the integrated structure of the top cover and the connecting piece of the present utility model, the second plastic part is provided with a ventilation net corresponding to the explosion-proof valve hole. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0018] Figure 1 Schematic diagram of the integrated structure of the top cover and the connecting piece in Embodiments 1-6 of the present utility model;

[0019] Figure 2 Structural schematic diagram of the terminal post and the connecting piece in Embodiment 1 of the present utility model;

[0020] Figure 3 Structural schematic diagram of the first plastic part and the terminal post in Embodiment 2 of the present utility model;

[0021] Figure 4 Structural schematic diagram of the main body and the second plastic part in Embodiment 3 of the present utility model;

[0022] Figure 5 Structural schematic diagram of the connecting piece and the second plastic part in Embodiment 4 of the present utility model;

[0023] Figure 6 Side view of the integral structure of the top cover and the connecting piece in Embodiment 4 of the present utility model;

[0024] Figure 7 is Figure 6 The sectional view taken along A-A in;

[0025] Figure 8 Structural schematic diagram of Embodiment 6 of the present utility model;

[0026] Wherein:

[0027] 1 - Terminal post;

[0028] 11 - Column body;

[0029] 111 - Second chamfer;

[0030] 12 - Welding body;

[0031] 2 - First plastic part;

[0032] 21 - First plastic body;

[0033] 211 - First chamfer;

[0034] 22 - Mounting hole;

[0035] 3 - Main body;

[0036] 31 - Assembly hole;

[0037] 32 - Explosion-proof valve hole;

[0038] 33 - Explosion-proof component;

[0039] 331 - Explosion-proof valve;

[0040] 332 - Protection patch;

[0041] 34 - Liquid injection hole;

[0042] 35 - Liquid injection valve;

[0043] 4 - Second plastic part;

[0044] 41 - Transition hole;

[0045] 42 - Second plastic body;

[0046] 43 - Isolation part;

[0047] 44 - Ventilation net;

[0048] 5 - Connecting piece;

[0049] 51 - Convex part;

[0050] 511 - Accommodating hole;

[0051] 52 - One piece;

[0052] 6 - Insulator. Detailed implementation mode

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0054] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Although the present application is disclosed above in a preferred embodiment, it is not used to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application. Therefore, the protection scope of the present application should be determined by the scope defined by the claims of the present application.

[0056] The following further describes the present utility model in detail in conjunction with specific embodiments, but the embodiments of the present utility model are not limited thereto.

[0057] Embodiment 1

[0058] As Figure 1-2 shown, a structure integrating a top cover and a connecting piece includes a pole 1, a first plastic part 2, a body 3, a second plastic part 4 and a connecting piece 5. The body 3 has an assembly hole 31. The pole 1 corresponds to the assembly hole 31 and is disposed on one side of the body 3 in the thickness direction through the first plastic part 2. The connecting piece 5 is insulatively assembled on the other side of the body 3 in the thickness direction through the second plastic part 4. The second plastic part 4 has a transition hole 41 corresponding to the assembly hole 31. The connecting piece 5 has a convex part 51. The convex part 51 sequentially passes through the transition hole 41 and the assembly hole 31 and is welded to the pole 1 to form an integrated structure.

[0059] For the above embodiment, the integrated structure of the top cover and the connecting piece 5 of the present utility model realizes the stable connection between the connecting piece 5 and the pole 1 by sequentially passing the convex part 51 of the connecting piece 5 through the transition hole 41 of the second plastic part 4 and the assembly hole 31 of the body 3 and welding it to the pole 1. This structure does not rely on complex positioning tooling parts, simplifies the welding process, and improves the welding efficiency. At the same time, the second plastic part 4 and the body 3 are respectively disposed on both sides of the pole 1 and the connecting piece 5, enhancing the stability and reliability of the overall structure.

[0060] During the implementation process, the prior art methods often penetrate the welding device through the transition hole 41 to realize the welding process between the connecting piece 5 and the pole 1. However, in this embodiment, in order to significantly improve the stability of the integrated structure of the top cover and the connecting piece 5 of the present utility model, the internal structure of the convex part 51 is improved, and a hollow structure design as Figure 2 shown is adopted. This design enables the conventional welding device to directly penetrate from the inside of the pole 1 to weld the convex part 51 and the pole 1 after the convex part 51 and the pole 1 are spliced in the horizontal direction. In addition, the choice of the welding device is not limited to laser welding devices and ultrasonic welding devices. For ultrasonic welding, there is no need to penetrate, and the laser is directly emitted from the outside of the hollow structure to the inside of the structure to realize welding. It is worth mentioning that this hollow design not only optimizes the structural stability but also effectively reduces the weight of the connecting piece 5, reduces the materials that need to be added to the convex part 51 and the pole 1, and thus improves the overall lightweight level.

[0061] In addition, the conventional welding device adopts the method of entering from the back side of the convex part 51, which not only makes the welding process more convenient and efficient, but also ensures the stability of the welding quality. Since the second plastic part 4 has insulating properties, it can effectively prevent the current from flowing from the connecting piece 5 to the body 3, thus significantly improving the safety of the overall structure. This series of improvements enables this embodiment to achieve the dual goals of lightweight and efficient welding while ensuring the structural stability and safety.

[0062] In summary, the integrated structure of the top cover and the connecting piece 5 of the present utility model realizes the processing procedures of welding from the inside of the terminal post 1 and laser welding from the outside by improving the internal structure of the convex part 51. It not only simplifies the welding process, improves the welding efficiency, but also enhances the stability and reliability of the overall structure.

[0063] Furthermore, the shape of the convex part 51 is not limited to a cylindrical shape inside. It can adapt to various shapes of the body 3 of the top cover structure and the second plastic part 4 of the present utility model. For example, the convex part 51 can be designed as a cone or a cylinder, and its size can be adjusted according to actual needs to ensure that the convex part 51 can smoothly pass through the transition hole 41 and the assembly hole 31 and achieve a tight connection with the terminal post 1. Such a design not only enhances the structural stability but also improves the accuracy and reliability of welding.

[0064] Furthermore, as Figure 2 shown, the terminal post 1 includes a column body 11 and a welding body 12 connected to the end face of the column body 11. The convex part 51 has a receiving hole 511. The welding body 12 is received in the receiving hole 511 and welded to the convex part 51. This design makes the connection between the terminal post 1 and the connecting piece 5 tighter, improving the stability of the overall structure. At the same time, the welding operation between the welding body 12 and the convex part 51 is also more convenient, improving the welding efficiency. In addition, the existence of the receiving hole 511 also provides sufficient space for the welding body 12, ensuring the stability of the welding quality. Moreover, the welding method between the welding body 12 and the convex part 51 can adopt mature welding technologies such as laser welding and ultrasonic welding to ensure reliable welding quality and stable connection. The design of the receiving hole 511 enables the welding body 12 to be accurately positioned on the convex part 51, avoiding position deviation during the welding process and further improving the accuracy and stability of welding.

[0065] Furthermore, the welding body 12 is made of copper and the column body 11 is made of aluminum. It is known that copper has very high electrical conductivity and electric conductivity, much higher than that of aluminum. This enables better electrical conductivity and current transmission ability at the connection when using copper as the welding body 12. By welding the copper contact part, the deficiency of aluminum in electrical conductivity can be compensated, thus ensuring the stability and performance of the overall circuit.

[0066] In addition, copper has excellent corrosion resistance and is not easily rusted, which is crucial for long-term stable electrical connections. Selecting copper as the welding body 12 can effectively control the contact resistance at the connection, reducing the adverse effects of contact resistance on circuit performance. It is worth mentioning that copper material has good weldability during welding, which can ensure the stability and reliability of the welded joint. While improving the structure of the pole 1 in this embodiment, selecting a suitable welding process can further ensure the contact between the pole 1 and the connecting piece 5, avoiding loosening or high contact resistance on the contact surface, thereby improving the quality and reliability of the overall electrical connection.

[0067] The assembly method of the above-mentioned integrated structure of the top cover and the connecting piece includes the following steps:

[0068] S1. First, assemble the second plastic part 4 with the body 3, and then sequentially pass the convex part 51 of the connecting piece 5 through the transition hole 41 of the second plastic part 4 and the assembly hole 31 of the body 3;

[0069] S2. Install the pole 1 in the first plastic part 2 so that one end face of the pole 1 corresponding to the body 3 is assembled with the convex part 51;

[0070] S3. Weld the pole 1 and the convex part 51 in step S2 to form an integrated structure of the top cover and the connecting piece 5.

[0071] Specifically, the assembly process first involves accurately passing the convex part 51 of the connecting piece 5 through the transition hole 41 of the second plastic part 4 and the assembly hole 31 of the body 3, thereby initially constructing an integrated structure of the top cover and the connecting piece 5. It is worth mentioning that compared with the prior art, the first step of the assembly method of the present invention is very different from the prior art. In the prior art, the pole 1 usually needs to pass through the first plastic part 2 and the body 3 first, and then further pass through the second plastic part 4 to directly contact the pole piece. Subsequently, the connecting piece 5 and the pole 1 are firmly connected in the gap of the second plastic part 4 by means of ultrasonic welding or laser welding, and the second plastic part 4 is encapsulated. However, in the present invention, the present invention directly assembles the second plastic part 4 and the connecting piece 5. Thanks to the unique design of the convex part 51, it can ensure that the connecting piece 5 seamlessly fits into the assembly hole 31.

[0072] First, during the implementation process, the present utility model adds the encapsulation process for the second plastic part 4 and the connecting piece 5. These processes include but are not limited to using professional plastic welding equipment, such as a hot air gun or an ultrasonic welding machine, heating the plastic to the melting point and pressing it together to form a stable connection; or using special glues or adhesives designed for plastics to ensure a tight adhesion between plastic parts. When selecting the adhesive, it is necessary to ensure its compatibility with the plastic material, and the surface needs to be kept clean before operation to ensure the best adhesion effect. Through the above measures, the present utility model ensures the stability and reliability of the assembly of the top cover and the connecting piece 5.

[0073] Secondly, in step S2, the pole 1 is installed inside the first plastic part 2, so that one end face of the pole 1 corresponding to the body 3 is assembled with the convex part 51. Through the first plastic part 2, the end face of the pole 1 is horizontally flush with the accommodating hole 511 of the convex part 51, which is convenient for the further welding process to be carried out, thus quickly realizing step S3. However, different from the assembly method of the prior art: the present utility model directly joins the pole 1 and the convex part 51 of the connecting piece 5 together. Due to the hollow design of the splicing convex part 51, in this application, direct welding operation is not required immediately. Instead, there is sufficient time to complete the alignment operation of the pole 1 and the connecting piece 5. In this step, multiple alignment effect testing processes can be added, including but not limited to using optical equipment (such as lasers or vision systems), an optical alignment system that can accurately measure and adjust the positions of components to ensure their correct alignment in three-dimensional space, and a laser measurement device that utilizes the principle of laser rangefinder projection to quickly measure the positions and distances of components to assist in precise positioning and alignment.

[0074] Finally, the welding device penetrates into the inside of the convex part 51, and the pole 1 and the connecting piece 5 are horizontally welded together inside the convex part 51, thus realizing a stable connection between the pole 1 and the connecting piece 5. This assembly method not only simplifies the assembly process and improves the assembly efficiency, but also ensures the connection strength and stability among the top cover, the connecting piece 5, and the pole 1, effectively avoiding problems such as false soldering and voids, and improving the safety and reliability of the battery. In addition, different from the prior art, in the present utility model, the welding of the pole 1 and the connecting piece 5 by this method allows for technical remedies for errors in any of the foregoing links. Since the welding area is inside the protrusion of the connecting piece 5, the solder in the welding area can be removed by a solder removal device and then directly re-welded, while the welding method of the prior art does not support this method.

[0075] In summary, through the adoption of a specific assembly method, this embodiment further improves the stability and reliability of the integrated structure of the top cover and the connecting piece, providing a more reliable guarantee for the safe use of the battery.

[0076] Embodiment 2

[0077] As Figure 1-3 shown, different from Embodiment 1, in order to further improve the stability of the present utility model, the first plastic part 2 includes a first plastic body 21 and a mounting hole 22 formed by the first plastic body 21. The column 11 is disposed in the mounting hole 22. The first plastic body 21 has a first chamfer 211, and the column 11 has a second chamfer 111. The second chamfer 111 is mounted corresponding to the first chamfer 211.

[0078] Specifically, this design makes the connection between the column 11 and the first plastic part 2 closer, effectively preventing loosening and falling off. At the same time, the second chamfer 111 and the first chamfer 211 are mounted corresponding to each other. This chamfer design not only enhances the connection strength between the column 11 and the first plastic part 2, but also makes the assembly process smoother, improving the assembly efficiency.

[0079] More importantly, by providing the first chamfer 211 and the second chamfer 111, the integral structure of the top cover and the connecting piece 5 of the present utility model will not have the problem of internal rotation under the action of external force, preventing the internal rotation of the pole column 1 under the action of external force and thus damaging the welding strength between the pole column 1 and the connecting piece 5 and affecting the performance of the entire top cover.

[0080] For the rest that is the same as Embodiment 1, it will not be elaborated in this embodiment.

[0081] Embodiment 3

[0082] As Figure 1-4 shown, different from Embodiment 1, in order to further improve the performance of the second plastic part 4 in the present utility model, the second plastic part 4 in the present utility model is designed with a second plastic body 42 and an isolation part 43 connected to the second plastic body 42 and disposed around the edge of the transition hole 41. The isolation part 43 is placed in the assembly hole 31 and closely attached to the body 3. By improving the design of the second plastic part 4, while ensuring the stability of the integral structure of the top cover and the connecting piece 5, the reliability of the structure is further enhanced.

[0083] Specifically, the second plastic part 4 includes a second plastic body 42 and an isolation part 43 connected to the second plastic body 42 and disposed around the edge of the transition hole 41. The design of the isolation part 43 enables the second plastic part 4 to fit more closely to the body 3, effectively preventing the current from flowing from the connecting piece 5 to the body 3, thereby significantly improving the safety of the overall structure. At the same time, the isolation part 43 is closely attached to the body 3, which also enhances the connection strength between the second plastic part 4 and the body 3, further improving the stability of the overall structure.

[0084] In specific implementation, this improved design enables the integral structure of the top cover and the connecting piece 5 to better adapt to various complex working environments, improving its reliability and durability in practical applications.

[0085] Other parts that are the same as those in Embodiment 1 will not be elaborated in this embodiment.

[0086] Embodiment 4

[0087] As Figure 1-7 shown, different from Embodiment 1: In order to further improve the connection strength between the connecting piece and the top cover in the present invention, a sheet body 52 connected to the convex portion 51 is additionally designed for the connecting piece 5 in Embodiment 1. A fuse piece 521 is provided in the sheet body 52 and the sheet body 52 is closely attached to the second plastic body 42. Among them, by adding the sheet body 52 connected to the convex portion 51 on the connecting piece 5, the connection strength between the connecting piece 5 and the top cover is further improved in this embodiment. The sheet body 52 is closely attached to the second plastic body 42, which not only increases the contact area between the connecting piece 5 and the top cover, but also makes the connection more compact, effectively preventing loosening and falling off, and this design is especially suitable for occasions with high requirements for connection strength. At the same time, a fuse piece 521 is also provided on the sheet body 52. By designing the fuse piece 521 on the sheet body 52, in specific situations, such as abnormal states like overcurrent and overheat, the fuse piece 521 can quickly fuse, thereby disconnecting the circuit and protecting the entire device from damage. This design not only enhances the connection strength between the connecting piece 5 and the top cover, but also provides an additional safety protection function.

[0088] In specific implementation, the shape and size of the sheet body 52 can be adjusted according to actual needs to ensure that it can closely fit the second plastic body 42 and form a good connection with the convex portion 51. At the same time, the material of the sheet body 52 also needs to be selected with good electrical conductivity and mechanical properties to ensure the stable and reliable connection between the connecting piece 5 and the top cover.

[0089] Furthermore, through Figure 6 and its sectional view - Figure 7 the detailed display, it can be more clearly seen the tightness of the connection between the convex portion 51 in the connecting piece 5 and the pole 1, and the tight structure formed between the sheet body 52 and the second plastic body 42. First of all, the tight fit shown by the convex portion 51 and the pole 1 in the sectional view not only increases the contact area, but also effectively prevents loosening and falling off through the tight physical structure cooperation, thus ensuring the stable connection between the connecting piece 5 and the pole 1. Secondly, combined with the seamless connection formed by the sheet body 52 closely attached to the second plastic body 42 shown in the above Figure 5 it reflects that the design of this embodiment not only enhances the overall connection strength between the connecting piece 5 and the top cover, but also makes the current transmission smoother, reduces the resistance, and improves the technical effect of the performance of the entire system.

[0090] In summary, through the design of adding the sheet body 52, the connection strength between the connecting sheet 5 and the top cover is further improved in this embodiment, enhancing the stability and reliability of the overall structure.

[0091] For those that are the same as Embodiment 1, they will not be elaborated in this embodiment.

[0092] Embodiment 5

[0093] As Figure 1 shown, different from Embodiment 1: In order to further improve the sealing performance of the connection between the top cover and the connecting sheet of the present utility model, an insulator 6 is further provided between the assembly hole 31 and the connection of the first plastic part 2. In a specific embodiment, the insulating part is in the structure of a sealing ring. Through the design of introducing the insulator 6, the sealing performance of the integrated structure of the top cover and the connecting sheet 5 is significantly improved in this embodiment. The insulator 6 is located between the assembly hole 31 and the connection of the first plastic part 2, playing a good sealing role, effectively preventing external media or moisture from entering the interior, thereby protecting the internal electrical components from damage. At the same time, the insulator 6 also enhances the stability and reliability of the structure and extends the service life.

[0094] In a specific embodiment, the insulator 6 can be made of a material with excellent sealing performance and durability to ensure its long-term stable sealing effect. In addition, in this embodiment, the shape and size of the insulator 6 can also be further improved according to the specific structure to ensure that it can closely fit between the assembly hole 31 and the first plastic part 2 to form an effective sealing barrier.

[0095] In summary, through the design of introducing the insulator 6, the sealing performance of the integrated structure of the top cover and the connecting sheet 5 is further improved in this embodiment, which is especially applicable to batteries with high requirements for the sealing performance of the top cover and the pole 1.

[0096] For those that are the same as Embodiment 1, they will not be elaborated in this embodiment.

[0097] Embodiment 6

[0098] As Figure 1-8 shown, different from Embodiment 1: In order to further improve the explosion-proof performance of the present utility model, an explosion-proof valve hole 32 is provided beside the assembly hole 31 on the body 3, and an explosion-proof valve assembly 33 is arranged in the explosion-proof valve hole 32.

[0099] In this embodiment, as Figure 8As shown in the figure, by providing an explosion-proof valve hole 32 on the body 3 and installing an explosion-proof valve assembly 33 in the explosion-proof valve hole 32, the explosion-proof performance of the integrated structure of the top cover and the connecting piece 5 is significantly improved. The explosion-proof valve assembly 33 can automatically open when the internal pressure of the battery rises abnormally, releasing the internal pressure, thereby effectively preventing the battery from exploding. This design not only improves the safety of the battery but also reduces the risks during the use of the battery.

[0100] At the same time, the design and installation of the explosion-proof valve assembly 33 need to consider the sealing performance and stability to ensure that the explosion-proof valve assembly 33 does not malfunction or leak under normal working conditions. In summary, through the introduction of the explosion-proof valve 331 design, the explosion-proof performance of the integrated structure of the top cover and the connecting piece is significantly improved, providing an important guarantee for the safe use of the battery.

[0101] Furthermore, in the explosion-proof valve assembly 33 of this embodiment, it includes an explosion-proof valve 331 and a protective patch 332. The explosion-proof valve 331 is disposed in the explosion-proof valve hole 32, and the protective patch 332 is disposed on the side of the explosion-proof valve 331 away from the second plastic part 4. By providing an explosion-proof valve hole 32 on the body 3 and installing an explosion-proof valve assembly 33 in the explosion-proof valve hole 32, the explosion-proof performance of the integrated structure of the top cover and the connecting piece 5 is further enhanced. Specifically, the explosion-proof valve assembly 33 consists of an explosion-proof valve 331 and a protective patch 332. The explosion-proof valve 331 is placed in the explosion-proof valve hole 32, while the protective patch 332 covers the side of the explosion-proof valve 331 away from the second plastic part 4. This design ensures that the explosion-proof valve 331 can open in time when the internal pressure of the battery is abnormal, releasing the internal pressure and effectively avoiding safety accidents such as battery explosion.

[0102] In summary, through the introduction of the explosion-proof valve assembly 33 design, the explosion-proof performance of the integrated structure of the top cover and the connecting piece 5 is further improved, providing a more reliable guarantee for the safe use of the battery.

[0103] Furthermore, in order to further improve the safety of the battery, as an improvement to an integrated structure of a top cover and a connecting piece of the present utility model, a ventilation net 44 is provided on the second plastic part 4 corresponding to the explosion-proof valve hole 32. The provision of the ventilation net 44 can not only ensure the gas circulation inside the battery, prevent the internal pressure of the battery from being too high, but also effectively prevent the electrolyte or other substances inside the battery from leaking out, thereby protecting the cleanliness and safety of the battery and its surrounding environment.

[0104] Furthermore, in this embodiment, the improvement of the integrated structure of the top cover and the connecting piece 5 is that a liquid injection hole 34 and a liquid injection valve 35 are also provided on the body 3. The setting of the liquid injection hole 34 and the liquid injection valve 35 makes the electrolyte injection process of the battery more convenient and safe. Through the liquid injection hole 34, the electrolyte can be directly injected into the battery interior, while the liquid injection valve 35 plays a role in controlling the electrolyte flow rate, preventing the problems of too much or too little electrolyte. At the same time, the liquid injection valve 35 also has good sealing performance, ensuring the sealing of the battery interior and preventing the leakage of the electrolyte.

[0105] In addition, the design of the liquid injection hole 34 and the liquid injection valve 35 also takes into account the convenience of operation, making the production and maintenance processes of the battery more efficient. This improved design not only improves the production efficiency of the battery, but also provides a strong guarantee for the safety and stability of the battery. In practical applications, this integrated structure of the top cover and the connecting piece 5 with the liquid injection hole 34 and the liquid injection valve 35 will play an important role.

[0106] For those that are the same as those in Embodiment 1, they will not be elaborated in this embodiment.

[0107] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0108] The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. An integrated structure of a top cover and a connecting piece, characterized in that: It includes a terminal post (1), a first plastic part (2), a body (3), a second plastic part (4) and a connecting piece (5). The body (3) has an assembly hole (31). The terminal post (1) corresponds to the assembly hole (31) and is arranged on one side of the body (3) in the thickness direction through the first plastic part (2). The connecting piece (5) is insulatively assembled on the other side of the body (3) in the thickness direction through the second plastic part (4). The second plastic part (4) has a transition hole (41) corresponding to the assembly hole (31). The connecting piece (5) has a convex part (51). The convex part (51) sequentially passes through the transition hole (41) and the assembly hole (31) and is welded to the terminal post (1) to form an integral structure.

2. The integrated structure of the top cover and the connecting piece according to claim 1, wherein: The terminal post (1) includes a column body (11) and a welding body (12) connected to the end face of the column body (11). The convex part (51) has a receiving hole (511). The welding body (12) is received in the receiving hole (511) and is welded to the convex part (51).

3. The integrated structure of the top cover and the connecting piece according to claim 2, wherein: The first plastic part (2) includes a first plastic body (21) and an installation hole (22) formed by the first plastic body (21). The column body (11) is arranged in the installation hole (22). The first plastic body (21) has a first chamfer (211). The column body (11) has a second chamfer (111). The second chamfer (111) is installed corresponding to the first chamfer (211).

4. The integrated structure of the top cover and the connecting piece according to claim 1, wherein: The second plastic part (4) includes a second plastic body (42) and an isolation part (43) connected to the second plastic body (42) and arranged around the edge of the transition hole (41). The isolation part (43) is placed in the assembly hole (31) and is in close contact with the body (3).

5. The integrated structure of the top cover and the connecting piece according to claim 4, wherein: The connecting piece (5) includes a sheet body (52) connected to the convex part (51). A fuse sheet (521) is provided in the sheet body (52), and the sheet body (52) is in close contact with the second plastic body (42).

6. The integrated structure of a top cover and a connecting piece according to claim 1, characterized in that: An insulator (6) is also provided between the connection part of the assembly hole (31) and the first plastic part (2).

7. The integrated structure of a top cover and a connecting piece as claimed in claim 1, wherein: An explosion-proof valve hole (32) is provided beside the assembly hole (31) on the body (3), and an explosion-proof valve assembly (33) is provided in the explosion-proof valve hole (32).

8. The integrated structure of a top cover and a connecting piece according to claim 7, characterized in that: The explosion-proof valve assembly (33) includes an explosion-proof valve (331) and a protection patch (332). The explosion-proof valve (331) is arranged in the explosion-proof valve hole (32), and the protection patch (332) is arranged on the side of the explosion-proof valve (331) away from the second plastic part (4).

9. The integrated structure of a top cover and a connecting piece according to claim 8, characterized in that: The second plastic part (4) is provided with a ventilation net (44) corresponding to the explosion-proof valve hole (32).

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