Cylindrical battery structure

Abstract

The cylindrical battery structure comprises a shell, a BMS (Battery Management System) protection module, a roll core and a battery cathode, a mounting cavity is formed in the shell, a battery anode is arranged at one end of the shell, an opening is formed in the other end of the shell, a contact is arranged at the bottom of the BMS protection module, an anode bulge is arranged at the top of the BMS protection module, and a cathode side edge is arranged on the outer ring of the BMS protection module; one end of the roll core is provided with a positive electrode end, the other end of the roll core is provided with a negative electrode end, the roll core is arranged in the mounting cavity of the shell, the positive electrode end is in contact with the contact for welding, and the negative electrode of the battery is arranged at the opening of the shell; the utility model has the advantage of effectively solving the problems of poor positioning precision, limited sealing structure, easy electrolyte overflow to damage electric equipment, difficult accurate control of electrode connection, easy poor contact, complex positive electrode connection, reduced production efficiency and increased short circuit risk due to the adoption of a positive electrode part assembly mode in the traditional process.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a cylindrical battery structure. Background Technology

[0002] In traditional battery assembly production, the assembly process typically begins with the positive electrode. This involves placing core components such as the battery core and BMS protection module into the casing from top to bottom, with the positive electrode connection and encapsulation completed last. This assembly method has significant drawbacks: First, during top assembly, the positioning of the battery core within the casing is easily interfered with by subsequent operations, leading to insufficient installation accuracy. Furthermore, the gradually limited internal space makes precise electrode connection difficult, easily resulting in poor contact and intermittent connections, severely impacting battery charge and discharge performance. Second, connecting the positive electrode at the end of assembly restricts operational space, reducing production efficiency, increasing labor costs, and introducing a higher risk of short circuits due to the complex operation. Third, the structural design of the top assembly makes it difficult to optimize the battery sealing structure, allowing electrolyte to easily leak from weak points in the top seal. This not only causes battery performance degradation but may also seep into the equipment, causing damage. This solution, however, adopts an assembly method starting from the bottom and encapsulating the negative electrode last, effectively avoiding these problems. This method allows for ample space to be reserved in the early stages of assembly, facilitating precise positioning and installation of components such as the core and BMS protection module. By the time the battery negative electrode is finally encapsulated, the overall structure is already stable, further ensuring the stability and sealing of the electrode connections, preventing leakage, and improving battery production efficiency and product quality. Utility Model Content

[0003] The purpose of this utility model is to provide a cylindrical battery structure to solve the problems of traditional batteries, which mostly adopt the top assembly method, resulting in poor positioning accuracy, limited operating space, difficulty in accurately controlling motor connection, easy to lead to poor contact, and crowded internal space and complex connection when assembling the positive electrode, which reduces production efficiency and increases the risk of short circuit.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] A cylindrical battery structure includes a casing, a battery management system (BMS) protection module, a winding core, and a battery negative electrode. The casing has an internal mounting cavity, with the battery positive electrode at one end and an opening at the other. The BMS protection module has a contact point at the bottom, a positive electrode protrusion at the top, and a negative electrode side on its outer ring. The BMS protection module is inserted into the casing through the opening, such that the positive electrode protrusion abuts against the battery positive electrode, and the negative electrode side is in close contact with the inner wall of the casing. The winding core has a positive terminal at one end and a negative terminal at the other. The winding core is then placed into the casing mounting cavity, such that the positive terminal contacts the contact point and is welded to form an electrical connection. The battery negative electrode includes a metal sheet and a sealing ring, with the sealing ring located on the outer ring of the metal sheet. The battery negative electrode is located at the opening of the casing, and the metal sheet is welded to the negative terminal to form an electrical connection.

[0006] Furthermore, the positive electrode of the battery includes a positive electrode cap and an insulating sheet. The insulating sheet has a ring-shaped design, is made of polyimide material, and has a thickness of 0.2-0.5 mm. The insulating sheet is disposed between the positive electrode cap and the outer shell, and the edge of the insulating sheet extends to the inner wall of the outer shell to form a wrapping structure to isolate the positive electrode cap from the outer shell, so as to prevent the two from being electrically connected and forming a short circuit.

[0007] Furthermore, the positive terminal is welded to the contact point to achieve an electrical connection between the core and the BMS protection module. An insulating protective layer is provided around the welding point. The insulating protective layer is made of high-temperature resistant epoxy resin material with a thickness of 0.1-0.3mm to prevent oxidation of the welding point and the risk of power failure due to detachment.

[0008] Furthermore, the negative terminal is welded to the metal sheet of the battery negative terminal to achieve an electrical connection between the winding core and the battery negative terminal.

[0009] Furthermore, the outer casing is provided with a groove near the opening, the negative electrode of the battery is embedded in the groove, and a seal is formed by mechanical stamping. During the stamping and sealing process, the outer casing is connected to the metal sheet of the negative electrode of the battery, so that the core and the outer casing are electrically connected. The outer casing is also electrically connected to the BMS protection module through the side of the negative electrode.

[0010] Beneficial effects: This utility model has the following beneficial effects:

[0011] 1. By adopting the method of assembling from the bottom and sealing the negative terminal of the battery last, sufficient space can be reserved for the core, BMS protection module, etc. in the early stage of assembly, which facilitates accurate positioning and installation. This avoids the positioning deviation caused by space constraints in traditional top assembly, ensuring a stable connection between the positive terminal and the BMS protection module, and between the negative terminal and the negative terminal of the battery, reducing contact problems.

[0012] 2. The groove design near the opening of the outer shell, together with the sealing ring and metal sheet of the negative terminal of the battery, achieves a tight seal through mechanical die stamping. Compared with the traditional sealing method, this structure can better resist external pressure and vibration, effectively prevent electrolyte leakage, not only protect the battery's own performance stability, but also avoid damage to electrical equipment, and extend the service life of the battery and equipment.

[0013] 3. The positive and negative terminals are respectively connected to the BMS protection module and the negative terminal of the battery by welding. A high-temperature resistant epoxy resin insulating protective layer is added around the welding point to effectively prevent oxidation of the welding point and external short circuit. The positive terminal of the battery forms a wrapped insulation structure with the help of a ring-shaped polyimide insulating sheet to isolate the positive terminal cap from the outer shell. The negative terminal of the battery is embedded in the opening of the outer shell to form a sealed structure. The combination of multiple measures ensures the stable connection of the battery in all aspects, greatly reduces the risk of short circuit and improves the safety of use.

[0014] 4. During the bottom assembly process, when the negative electrode of the battery is finally encapsulated, the overall internal structure of the battery has been installed and is becoming stable. Encapsulating the negative electrode at this time can further ensure the stability of the electrode connection and the overall sealing of the battery, ensuring that the battery can operate stably and reliably in various usage scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the BMS protection module structure of this utility model;

[0017] Figure 3 for Figure 1 A schematic diagram of the structure of A in the middle.

[0018] In the diagram: 1-outer shell, 2-positive battery terminal, 3-BMS protection module, 4-contact, 5-positive protrusion, 6-negative side, 7-core, 8-positive terminal, 9-negative terminal, 10-negative battery terminal, 11-positive cap, 12-insulating sheet. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Combination Figures 1-3 The cylindrical battery structure shown includes a casing 1, a BMS protection module 3, a winding core 7, and a battery negative electrode 10. The casing 1 has an internal mounting cavity, with the battery positive electrode 2 located at one end and an opening at the other. The BMS protection module 3 has contacts 4 at its bottom, a positive electrode protrusion 5 at its top, and a negative electrode side 6 on its outer ring. The BMS protection module 3 is inserted through the opening in the casing 1, so that the positive electrode protrusion 5 abuts against the battery positive electrode 2, and the negative electrode side 6 is in close contact with the inner wall of the casing 1. This bottom-up assembly sequence provides ample space for the BMS protection module 3, avoiding the problems caused by limited space during traditional top-mounted assembly. The collision and misalignment of components caused by this ensures precise alignment between the positive electrode protrusion 5 and the positive electrode 2 of the battery, reducing contact resistance and improving conductivity. One end of the winding core 7 is provided with a positive terminal 8, and the other end is provided with a negative terminal 9. The winding core 7 is then placed into the mounting cavity of the outer casing 1, so that the positive terminal 8 contacts the contact point 4 and is welded to form an electrical connection. The bottom assembly process ensures that the winding core 7 is not interfered with by the components above during installation, significantly reducing the probability of poor contact. The battery negative electrode 10 includes a metal sheet and a sealing ring. The sealing ring is located on the outer ring of the metal sheet. The battery negative electrode 10 is located at the opening of the outer casing 1, and the metal sheet is welded to the negative terminal 9 to form an electrical connection.

[0021] The positive electrode 2 of the battery includes a positive electrode cap 11 and an insulating sheet 12. The insulating sheet 12 has a ring-shaped design, is made of polyimide material, and has a thickness of 0.2-0.5mm. The insulating sheet 12 is provided between the positive electrode cap 11 and the outer shell 1, and the edge of the insulating sheet 12 extends to the inner wall of the outer shell 1 to form a wrapping structure to isolate the positive electrode cap 11 from the outer shell 1, so as to prevent the two from being electrically connected and forming a short circuit. Compared with the traditional planar insulating sheet, this wrapping insulation design can better resist the insulation failure caused by external vibration, compression and other factors. Even when the battery is subjected to severe vibration, the insulating sheet 12 can still maintain good insulation performance, continuously isolate the electrical connection between the positive electrode cap 11 and the outer shell 1, effectively reduce the risk of short circuit and improve the safety performance of the battery.

[0022] The positive terminal 8 is welded to the contact 4 to achieve electrical connection between the core 7 and the BMS protection module 3. An insulating protective layer is provided around the welding point. The insulating protective layer is made of high-temperature resistant epoxy resin material with a thickness of 0.1-0.3mm. It is used to prevent oxidation of the welding point and the risk of power failure due to detachment. The insulating protective layer can not only effectively isolate the outside air and prevent the welding point from oxidizing and reducing conductivity, but also prevent the welding point from falling off and causing a circuit break, ensuring that the current transmission of the battery remains stable and reliable in complex operating environments.

[0023] The negative terminal 9 is welded to the metal sheet of the battery negative terminal 10 to achieve an electrical connection between the core 7 and the battery negative terminal 10. An insulating protective layer is also provided around the welding point. The insulating protective layer is made of high-temperature resistant epoxy resin material with a thickness of 0.1-0.3mm to prevent oxidation of the welding point and the risk of welding point detachment. At the same time, the insulating protective layer can also enhance the mechanical strength of the welding point, so that it can maintain a stable connection when subjected to current impact and temperature changes during battery charging and discharging.

[0024] The outer casing 1 has a groove near the opening, and the negative electrode 10 of the battery is embedded in the groove. The groove is formed by mechanical stamping to create a seal. During the stamping process, the metal sheet of the outer casing 1 and the negative electrode 10 of the battery are connected, so that the core 7 and the outer casing 1 are electrically connected. The outer casing 1 is also electrically connected to the BMS protection module 3 through the negative electrode side 6. In the final stage of bottom assembly, the negative electrode 10 of the battery, which consists of a sealing ring and a metal sheet, is embedded into the groove at the opening of the outer casing 1. The metal sheet is tightly bonded to the outer casing 1 by high-precision mechanical stamping, and the sealing ring fills the gap. This sealing method, which combines groove and stamping, has higher sealing strength and reliability than traditional sealing structures. The elastic deformation of the sealing ring can effectively compensate for gap changes caused by temperature changes, vibrations, and other factors, and maintain a good sealing effect to prevent electrolyte leakage. Even in harsh environments such as high temperature and high humidity, this sealing structure can still effectively protect the internal structure of the battery, avoid electrolyte leakage from damaging battery performance and electrical equipment, and significantly extend the service life of the battery and equipment.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cylindrical battery structure, characterized by: The device includes a housing (1), a BMS protection module (3), a core (7), and a battery negative electrode (10). The housing (1) has an internal mounting cavity. One end of the housing (1) has a battery positive electrode (2), and the other end is an opening. The BMS protection module (3) has a contact point (4) at the bottom, a positive electrode protrusion (5) at the top, and a negative electrode side (6) on its outer ring. The BMS protection module (3) is inserted through the opening in the housing (1), such that the positive electrode protrusion (5) abuts against the battery positive electrode (2), and the negative electrode side (6) abuts against the battery negative electrode (2). The inner wall of the outer shell (1) is in close contact; one end of the core (7) is provided with a positive terminal (8) and the other end is provided with a negative terminal (9). The core (7) is then placed into the mounting cavity of the outer shell (1) so that the positive terminal (8) is in contact with the contact point (4) and is welded to form an electrical connection; the battery negative electrode (10) includes a metal sheet and a sealing ring. The sealing ring is located on the outer ring of the metal sheet. The battery negative electrode (10) is located at the opening of the outer shell (1), and the metal sheet is welded to the negative terminal (9) to form an electrical connection.

2. The cylindrical battery structure of claim 1, wherein: The positive electrode (2) of the battery includes a positive electrode cap (11) and an insulating sheet (12). The insulating sheet (12) is a ring-shaped design, made of polyimide material, with a thickness of 0.2-0.5 mm. The insulating sheet (12) is provided between the positive electrode cap (11) and the outer shell (1), and the edge of the insulating sheet (12) extends to the inner wall of the outer shell (1) to form a wrapping structure to isolate the positive electrode cap (11) from the outer shell (1) to prevent them from being electrically connected and forming a short circuit.

3. The cylindrical battery structure of claim 1, wherein: The positive terminal (8) is welded to the contact (4) to achieve electrical connection between the core (7) and the BMS protection module (3). An insulating protective layer is provided around the welding point. The insulating protective layer is made of high-temperature resistant epoxy resin material with a thickness of 0.1-0.3mm to prevent oxidation of the welding point and the risk of power failure due to detachment.

4. The cylindrical battery structure of claim 3, wherein: The negative terminal (9) is welded to the metal sheet of the negative terminal (10) of the battery to achieve an electrical connection between the core (7) and the negative terminal (10) of the battery.

5. The cylindrical battery structure of claim 4, wherein: The outer casing (1) has a groove near the opening. The negative electrode of the battery (10) is embedded in the groove and is sealed by mechanical stamping. During the stamping process, the outer casing (1) is connected to the metal sheet of the negative electrode of the battery (10), so that the core (7) is electrically connected to the outer casing (1). The outer casing (1) is also electrically connected to the BMS protection module (3) through the negative electrode side (6).

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