Battery

Abstract

The utility model relates to a battery, and relates to the technical field of batteries, the battery comprises a roll core, a shell and a cover plate assembly, the two ends of the roll core are respectively provided with a tab, the cover plate assembly and the shell jointly package the roll core, the tabs penetrate out of the cover plate assembly, and the tabs and the cover plate assembly are connected through a hot melting sealing layer. The cover plate structure is simplified, the tabs and the cover plate assembly are connected through the hot melting sealing layer, the number of assemblies and assembly steps can be reduced, the labor cost is reduced, and the production period is shortened; by simplifying the structural design, the quality problem caused by improper assembly can be reduced, the rate of defective products is reduced, and the stability of the production process is improved; and in practical application, the hot-melt sealing layer can provide excellent sealing performance, electrolyte leakage and external pollution are prevented, the safety of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] With the increasing market demand for electronic devices and electric vehicles, cylindrical batteries, as important energy storage devices, have gradually become a focus of battery technology development. Cylindrical batteries, by winding electrode materials into a cylindrical structure, effectively improve energy density and safety, and are widely used in portable electronic products, hybrid powertrains, and electric vehicles. Their design concept involves arranging positive and negative tabs at both ends of a cylindrical structure, and then welding them to the positive and negative electrode covers via a busbar to achieve both electrical connection and mechanical fixation of the battery.

[0003] However, existing cylindrical battery cover structures exhibit significant complexity, primarily stemming from the assembly of multiple components. Specifically, current cylindrical battery covers typically consist of several components, including a lower plastic layer, a sealing ring, terminal posts, and an upper plastic layer. These components are not only numerous but also require independent processing and assembly procedures. The increased number of components makes the assembly process relatively cumbersome, leading to reduced production efficiency and increased labor costs and production cycles. Furthermore, the connection and sealing performance between these components directly impact the overall battery performance, including its safety and lifespan. The complex cover structure also increases the probability of quality control issues during production, potentially leading to higher defect rates and further increasing production costs.

[0004] Therefore, it is urgent to simplify the battery cover structure and optimize the design to reduce the number of components, improve production efficiency, and reduce material costs and assembly time. Utility Model Content

[0005] In order to simplify the cover structure of the battery, improve production efficiency, reduce material costs and assembly time, this application provides a battery.

[0006] The battery provided in this application adopts the following technical solution:

[0007] A battery includes a winding core, a housing, and a cover plate assembly. The winding core has tabs at both ends. The cover plate assembly and the housing together encapsulate the winding core. The tabs extend out of the cover plate assembly and are connected to the cover plate assembly by a heat-fused sealing layer.

[0008] By adopting the above technical solution, the electrode material is first prepared into electrode sheets, and then wound according to design requirements to form a core. The core has pre-drilled tabs at both ends for subsequent electrical connection. The core is placed inside the housing, ensuring the tabs protrude from the cover plate assembly. A hot-melt sealing layer is formed between the cover plate assembly and the tabs through a hot-melt process, ensuring sealing and strong connection, thus completing the assembly. This application simplifies the cover plate structure, reduces the number of components and assembly steps, lowers labor costs and production cycle. The simplified structure also reduces quality problems caused by improper assembly, lowers the defect rate, and improves the stability of the production process. Furthermore, the hot-melt sealing layer provides excellent sealing performance, preventing electrolyte leakage and external contamination, thus improving battery safety and lifespan.

[0009] In one specific implementation, the material of the hot-melt sealing layer is one of polypropylene, polyethylene, or polyurethane.

[0010] By adopting the above technical solutions, using polypropylene, polyethylene, or polyurethane as the hot-melt sealing layer, the connection and sealing can be achieved directly through the hot-melt process, which facilitates efficient assembly during production. Polypropylene, polyethylene, and polyurethane have good resistance to various chemical substances and can work stably within a certain temperature range, adapting to the needs of batteries under different operating conditions. Furthermore, these materials have low cost, which can effectively reduce production costs while ensuring good performance.

[0011] In one specific implementation, the cover plate assembly includes a first cover plate and a second cover plate, which are located at opposite ends of the housing. Both the first cover plate and the second cover plate have openings through which the electrode tabs protrude.

[0012] By adopting the above technical solution, the core is encapsulated in the housing by connecting the first cover plate and the second cover plate with the housing, which can prevent the influence of the external environment on the internal components and ensure the stability and long life of the equipment. The opening design allows the tabs to pass through smoothly, which not only simplifies the installation process, but also improves the assembly efficiency of the battery or energy storage device. The component design and connection method of this solution can greatly shorten the production and assembly time and improve production efficiency.

[0013] In one specific implementation, one of the first cover plate and the second cover plate is integrally formed with the housing, and the other is connected to the housing.

[0014] By adopting the above technical solution, the one-piece molded cover provides good strength and stability, enhances the durability of the overall structure, and the connectable other cover makes subsequent maintenance and inspection more convenient. The integrated design can reduce seams, reduce the risk of leakage, improve the reliability of the equipment, and reduce the number of parts and assembly complexity, thereby reducing production costs and improving efficiency.

[0015] In one specific implementation, both the tab and the opening are provided with the hot-melt sealing layer, which connects and seals the tab and the opening.

[0016] By adopting the above technical solution, the electrode tab and the opening are tightly connected by a hot-melt sealing layer, ensuring current conduction while effectively preventing leakage of internal battery components. By applying the hot-melt sealing layer to the electrode tab and the opening, the overall sealing performance and mechanical strength are enhanced.

[0017] In one specific implementation, the first cover plate and / or the second cover plate are provided with through holes for injecting electrolyte and for explosion protection.

[0018] By adopting the above technical solution and utilizing the through-hole design, electrolyte can be injected, ensuring uniform filling inside the battery and improving battery performance; it can also serve as a gas release channel, avoiding the risk of explosion caused by gas accumulation and ensuring safety.

[0019] In one specific implementation, an insulating film is also included, which covers the core circumferentially.

[0020] By adopting the above technical solution and utilizing the full-circumference wrapping design of the insulating film, the core and cover plate assembly can be effectively isolated, preventing short circuits caused by accidental current contact. The use of the insulating film greatly reduces the risk of short circuits in the battery during operation, improves the safety of the system, and helps to extend the battery's lifespan and reliability.

[0021] In one specific implementation, the insulating film is a polyester film.

[0022] By adopting the above technical solutions, the polyester film has excellent electrical insulation properties, which can effectively reduce the risk of battery short circuit and improve overall safety. In addition, the polyester film has good tolerance to a variety of chemical substances, which enhances the durability of the battery. It can also withstand high temperatures, making it suitable for the battery working environment and ensuring safety.

[0023] In one specific implementation, the insulating film is provided with openings for the electrolyte to fully wet the core.

[0024] By adopting the above technical solution, the perforation design ensures good wetting of the core while taking into account the function of the insulating film, thereby improving the overall performance and safety of the battery. The perforation design allows the electrolyte to fully contact the core, ensuring good wettability to improve battery performance. It also increases the flow channels of the electrolyte, avoids the formation of dry areas, and thus extends battery life.

[0025] In one specific implementation, the electrode tab is an L-shaped electrode tab, and the electrode tab is welded to the winding core.

[0026] By adopting the above technical solution, the L-shaped tab design can provide a larger contact area, which helps to improve the welding strength with the core; in addition, the L-shaped tab design also reduces contact resistance, improves conductivity, and ensures stable output of battery performance.

[0027] In summary, this application includes at least one of the following beneficial technical effects: By simplifying the cover plate structure and using a hot-melt sealing layer to connect the tabs and cover plate assembly, this application can reduce the number of components and assembly steps, thereby reducing labor costs and production cycle; by simplifying the structural design, it can also reduce quality problems caused by improper assembly, reduce the defect rate, and improve the stability of the production process; and in practical applications, the hot-melt sealing layer can provide excellent sealing performance, prevent electrolyte leakage and external contamination, and improve the safety and service life of the battery. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of this application.

[0029] Figure 2 It is a structural diagram used to show the shell, core and electrode tabs.

[0030] Figure 3 This is a structural diagram used to illustrate the housing and cover plate assembly.

[0031] Figure 4 It is a structural diagram used to show the core and insulating film.

[0032] Explanation of reference numerals in the attached drawings: 1. Core; 2. Housing; 3. Cover plate assembly; 31. First cover plate; 32. Second cover plate; 33. Opening; 34. Through hole; 4. Hot melt sealing layer; 5. Insulating film; 51. Opening; 6. Tab. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Reference Figure 1 and Figure 2This application discloses a battery, including but not limited to a cylindrical battery, comprising a core 1. In this embodiment, the core 1 is a cylindrical structure formed by winding electrode sheets. The core 1 has tabs 6 at both ends. In this embodiment, the tabs 6 are made of aluminum sheet, but are not limited to aluminum sheet. The two tabs 6 have opposite electrical properties: one is a positive tab, and the other is a negative tab. The positive tab is located at the top of the core 1, and the negative tab is located at the bottom of the core 1. The tabs 6 are L-shaped and are connected to the core 1 by laser welding. The L-shaped tab design provides a larger contact area, improves the welding strength with the core 1, reduces contact resistance, improves conductivity, and ensures stable battery performance.

[0035] The battery also includes a housing 2 and a cover assembly 3. In this embodiment, the housing 2 is a cylindrical housing 2, and the cover assembly 3 is located at both ends of the housing 2. The cover assembly 3 and the housing 2 together encapsulate the core 1 inside. The tab 6 extends out of the cover assembly 3, and the tab 6 and the cover assembly 3 are connected by a hot melt sealing layer 4.

[0036] The hot-melt sealing layer 4 is made of one of polypropylene, polyethylene, or polyurethane. In this embodiment, the hot-melt sealing layer 4 is made of polypropylene. By using polypropylene, polyethylene, or polyurethane as the hot-melt sealing layer 4, the connection and sealing can be achieved directly through the hot-melt process, which facilitates efficient assembly during production. Polypropylene, polyethylene, and polyurethane have good resistance to various chemicals and can work stably within a certain temperature range, adapting to the needs of the battery under different operating conditions. Furthermore, these materials have low cost, which can effectively reduce production costs while ensuring good performance.

[0037] During assembly, the electrode material is first prepared into electrode sheets and wound according to the design requirements to form core 1. The electrode tab 6 is connected to the core 1 by laser welding to facilitate subsequent electrical connection. The core 1 is placed inside the housing 2, ensuring that the electrode tab 6 protrudes through the cover plate assembly 3. Through a hot melt process, a hot melt sealing layer 4 is formed between the cover plate assembly 3 and the electrode tab 6 to ensure sealing and connection firmness, thus completing the assembly.

[0038] In this process, by simplifying the cover plate structure and using the hot-melt sealing layer 4 to connect the tabs 6 and the cover plate assembly 3, the number of components and assembly steps can be reduced, labor costs and production cycle can be reduced; the simplified structure can also reduce quality problems caused by improper assembly, reduce the defect rate and improve the stability of the production process; and in practical applications, the hot-melt sealing layer 4 can provide excellent sealing performance, prevent electrolyte leakage and external pollution, and improve the safety and service life of the battery.

[0039] Reference Figure 2 and Figure 3The cover plate assembly 3 includes a first cover plate 31 and a second cover plate 32. The first cover plate 31 and the second cover plate 32 are respectively located at both ends of the housing 2. In this embodiment, the first cover plate 31 is disposed on the top of the housing 2 and is disposed corresponding to the positive electrode tab, and the second cover plate 32 is disposed on the bottom of the housing 2 and is disposed corresponding to the negative electrode tab. The first cover plate 31, the second cover plate 32 and the housing 2 together encapsulate the core 1 inside. Both the first cover plate 31 and the second cover plate 32 are provided with openings 33, and the electrode tab 6 passes through the openings 33.

[0040] Both the tab 6 and the opening 33 are provided with a hot-melt sealing layer 4. In this embodiment, the hot-melt sealing layer 4 is reserved at the tab 6 and the opening 33. The hot-melt sealing layer 4 is arranged along the circumference of the tab 6 and the opening 33. The tab 6 and the opening 33 are connected and sealed by the hot-melt sealing layer 4. This can ensure the conduction of current while effectively preventing the leakage of internal components of the battery. By applying the hot-melt sealing layer 4 to the tab 6 and the opening 33, the overall sealing performance and mechanical strength are enhanced.

[0041] One of the first cover plate 31 and the second cover plate 32 is integrally formed with the housing 2, and the other is connected to the housing 2. In this embodiment, the second cover plate 32 located at the bottom of the housing 2 is integrally formed with the housing 2, and the first cover plate 31 located at the top of the housing 2 is connected to the housing 2. The first cover plate 31 and the housing 2 include, but are not limited to, a fixed connection or a detachable connection. By designing the second cover plate 32 to be integrally formed with the housing 2, good strength and stability can be provided, enhancing the durability of the overall structure. The design of the connectable first cover plate 31 can facilitate subsequent encapsulation, maintenance and inspection. Through the integrated design, seams can be reduced, leakage risk can be reduced, equipment reliability can be improved, and the number of parts and assembly complexity can be reduced, production costs can be reduced and efficiency can be improved.

[0042] The first cover plate 31 and / or the second cover plate 32 are provided with through holes 34. In this embodiment, the first cover plate 31 that can be connected is provided with through holes 34. The size of the through holes 34 is designed according to the size of the tabs 6. The design of the through holes 34 allows for the injection of electrolyte, ensuring uniform filling inside the battery and improving battery performance. In addition, the through holes 34 can also serve as a gas release channel to avoid the risk of explosion caused by gas accumulation and ensure safety.

[0043] Reference Figure 3 and Figure 4 The battery also includes an insulating film 5, which covers the bare core 1 circumferentially. In this embodiment, the insulating film 5 is a polyester film. The polyester film has excellent electrical insulation properties, which can effectively reduce the risk of short circuit in the battery and improve overall safety. In addition, the polyester film has good tolerance to a variety of chemicals, which enhances the durability of the battery. It can also withstand high temperatures, making it suitable for the battery working environment and ensuring safety.

[0044] In actual assembly, after the bare core 1 is covered with an insulating film 5, the core 1 is then placed into the housing 2 for sealing. The full-circumference design of the insulating film 5 can effectively isolate the core 1 and the housing 2 from the cover plate assembly 3, preventing accidental current contact that could cause a short circuit. The use of the insulating film 5 greatly reduces the risk of short circuits during battery operation, improves system safety, and helps extend battery life and reliability.

[0045] The insulating film 5 is provided with an opening 51. In this embodiment, the opening 51 is connected to the through hole 34. The opening 51 is used to ensure that the electrolyte fully wets the core 1. By designing the opening 51, the function of the insulating film 5 can be taken into account while ensuring that the core 1 is well wetted, thereby improving the overall performance and safety of the battery. In addition, the design of the opening 51 allows the electrolyte to fully contact the core 1, ensuring its good wettability to improve battery performance. It can also increase the flow channels of the electrolyte, avoid the formation of dry areas, and thus extend the battery life.

[0046] In the prior art, the cost of structural components in cylindrical batteries accounts for 15% of the total cost. According to actual calculations, the cylindrical battery proposed in this application can reduce the cost of structural components to 7% of the total cost by simplifying the cover structure, reducing the number of components and assembly steps, which greatly saves costs and improves assembly efficiency.

[0047] The implementation principle of a battery in this application embodiment is as follows: This application mainly simplifies the cover plate structure and uses the hot melt sealing layer 4 to connect the tab 6 and the cover plate assembly 3, thereby reducing the number of components and assembly steps, reducing labor costs and production cycle, and providing excellent sealing performance, thereby improving the safety and service life of the battery.

[0048] During assembly, the electrode material is first prepared into electrode sheets and wound according to the design requirements to form a core 1. The electrode tabs 6 and the core 1 are connected together by laser welding to facilitate subsequent electrical connection. An insulating film 5 is wrapped around the bare core 1, and then the core 1 is placed inside the housing 2, ensuring that the bottom electrode tabs 6 pass through the opening 33 of the integrally formed second cover plate 32. Then the first cover plate 31 is covered, ensuring that the top electrode tabs 6 pass through the opening 33 of the first cover plate 31, and the first cover plate 31 is connected to the housing 2.

[0049] Then, through a hot-melt process, the opening 33 is fused together with the hot-melt sealing layer 4 reserved on the tab 6, so that the tab 6 is sealed to the first cover plate 31 and the second cover plate 32. Then, electrolyte is injected through the through hole 34 reserved on the first cover plate 31. At this time, the opening 51 reserved on the insulating film 5 can allow the electrolyte to fully wet the core 1. After the electrolyte is injected, the assembly is completed. In actual use, the through hole 34 reserved on the first cover plate 31 can also serve as a gas release channel, playing an explosion-proof role, avoiding the risk of explosion caused by gas accumulation, and ensuring safety.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A battery, characterized in that: The device includes a core (1), a housing (2), and a cover plate assembly (3). The core (1) has tabs (6) at both ends. The cover plate assembly (3) and the housing (2) together encapsulate the core (1). The tabs (6) protrude from the cover plate assembly (3). The tabs (6) and the cover plate assembly (3) are connected by a hot melt sealing layer (4).

2. The battery according to claim 1, characterized in that: The hot melt sealing layer (4) is made of one of polypropylene, polyethylene, or polyurethane.

3. The battery according to claim 1, characterized in that: The cover plate assembly (3) includes a first cover plate (31) and a second cover plate (32). The first cover plate (31) and the second cover plate (32) are located at both ends of the housing (2). Both the first cover plate (31) and the second cover plate (32) are provided with openings (33), through which the tab (6) protrudes.

4. The battery according to claim 3, characterized in that: One of the first cover plate (31) and the second cover plate (32) is integrally formed with the housing (2), and the other is connected to the housing (2).

5. The battery according to claim 3, characterized in that: Both the electrode tab (6) and the opening (33) are provided with the hot melt sealing layer (4), which connects and seals the electrode tab (6) and the opening (33).

6. The battery according to claim 3, characterized in that: The first cover plate (31) and / or the second cover plate (32) are provided with through holes (34), which are used for injecting electrolyte and for explosion protection.

7. The battery according to claim 1, characterized in that: It also includes an insulating film (5) that covers the core (1) circumferentially.

8. The battery according to claim 7, characterized in that: The insulating film (5) is a polyester film.

9. The battery according to claim 7, characterized in that: The insulating film (5) has an opening (51) for the electrolyte to fully wet the core (1).

10. The battery according to claim 1, characterized in that: The electrode tab (6) is an L-shaped electrode tab, and the electrode tab (6) is welded to the core (1).

Images