Pole lug connection structure of cylindrical battery

Abstract

This utility model discloses a tab connection structure for a cylindrical battery, including a housing, a cover welded to the top of the housing, a positive electrode welded to the inner wall of the cover, a negative electrode welded to the bottom of the housing, a winding core fixedly connected inside the housing, and an assembly mechanism disposed inside the housing. The assembly mechanism includes: a mounting part disposed inside the cover; and a positive electrode tab fixedly connected to the top of the winding core. This utility model relates to the field of cylindrical battery technology. This tab connection structure for a cylindrical battery achieves tab connection without welding the positive and negative electrodes through the cooperation of the housing, cover, winding core, and assembly mechanism. Therefore, it avoids the phenomenon of inconsistent production quality caused by direct welding of the electrodes. Welding the current collector does not change the contact area between the current collector and the electrode tab, thus having minimal impact on the connection effect and ensuring a high production pass rate.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to a tab connection structure for a cylindrical battery. Background Technology

[0002] Cylindrical batteries are a type of battery with high capacity, long cycle life, and a wide operating temperature range. They are used in solar lamps, lawn lamps, backup power, power tools, toy models, and photovoltaic energy.

[0003] Currently, most cylindrical battery tab connections are made by directly welding the tabs together. This results in inconsistent welding quality, which affects the overall production quality of the battery. Furthermore, the lack of a positioning auxiliary structure makes it easy for the small parts to shift during welding, leading to a decrease in welding quality and causing inconvenience for users. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a tab connection structure for cylindrical batteries. This solves the problem that currently, most cylindrical battery tab connections are made by directly welding the tabs together, which leads to inconsistent welding quality and affects the overall production quality of the battery. Furthermore, the lack of a positioning auxiliary structure makes the small parts prone to misalignment during welding, resulting in poor welding quality and inconvenience for users.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cylindrical battery tab connection structure, comprising a housing, a cover welded to the top of the housing, a positive electrode of the battery welded to the inner wall of the cover, a negative electrode of the battery welded to the bottom of the housing, a winding core fixedly connected inside the housing, and an assembly mechanism provided inside the housing. The assembly mechanism includes: a mounting part disposed inside the cover; a positive electrode tab fixedly connected to the top of the winding core; a negative electrode tab fixedly connected to the bottom of the winding core; a first current collector sleeved on the outer wall of the negative electrode tab and abutting against the lower part of the inner wall of the winding core and the housing, respectively; two first positioning blocks, respectively fixedly connected to the top two sides of the negative electrode of the battery and inserted into the bottom groove of the housing; and two second positioning blocks, respectively slidably engaged with the upper sides of the inner wall of the housing; wherein the mounting part and the first current collector connect the positive electrode tab and the negative electrode tab, respectively.

[0006] Preferably, the mounting part includes: a connecting plate, which is inserted into the bottom of the positive electrode of the battery; a second current collector, which is sleeved on the outer wall of the positive electrode tab and welded to the upper part of the inner wall of the housing, wherein the outer sides of the second current collector are respectively fixed to the outer walls of two second positioning blocks, and the top of the second current collector abuts against the bottom of the connecting plate; wherein the connecting plate and the second current collector connect the positive electrode tab and the positive electrode of the battery.

[0007] Preferably, the first current collector and the second current collector are tightly fitted to the negative electrode tab and the positive electrode tab, respectively.

[0008] Preferably, a central support member is fixedly connected to the inner wall of the core, and the top and bottom of the central support member abut against the sides of the second collector plate and the first collector plate that are close to each other.

[0009] Preferably, the outer walls of the shell and the cover are fitted with a protective outer skin. Beneficial effects

[0010] This utility model provides a tab connection structure for a cylindrical battery. It offers the following advantages: The tab connection structure, achieved through the cooperation of the shell, cover, winding core, and assembly mechanism, eliminates the need for welding the positive and negative tabs. This avoids the inconsistent production quality caused by direct welding of the tabs. Welding the current collector does not alter the contact area between the current collector and the tabs, thus having minimal impact on the connection effect and ensuring a high production yield. Furthermore, due to the small size of the cylindrical battery, the first and second positioning blocks provide auxiliary restraint, preventing misalignment during welding due to the small size of the parts, thereby improving welding quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 A sectional view;

[0013] Figure 3 for Figure 2 A schematic diagram of the structure of the inner shell, the cover, and the positive electrode of the battery;

[0014] Figure 4 for Figure 2 A schematic diagram of the structure of the core, shell, and protective outer skin.

[0015] In the diagram: 1. Shell; 2. Assembly mechanism; 21. Mounting part; 211. Connecting plate; 212. Second current collector plate; 22. Positive electrode tab; 23. Negative electrode tab; 24. First current collector plate; 25. First positioning block; 26. Second positioning block; 3. Battery negative electrode; 4. Central support component; 5. Battery positive electrode; 6. Protective outer casing; 7. Cover; 8. Core. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0018] Currently, when connecting the tabs of cylindrical batteries, most methods involve directly welding the tabs together. This results in inconsistent welding quality, which in turn affects the overall production quality of the battery. Furthermore, the lack of a positioning auxiliary structure makes it easy for the small parts to shift during welding, leading to a decrease in welding quality and causing inconvenience for users.

[0019] In view of this, the present invention provides a tab connection structure for a cylindrical battery. Through the cooperation of the shell, cover, core and assembly mechanism, the tabs are connected without welding the positive and negative tabs. This avoids the phenomenon of inconsistent production quality caused by direct welding of the tabs. Welding the current collector does not change the contact area between the current collector and the tab, thus having little impact on the connection effect. Therefore, the production qualification rate can be guaranteed. Furthermore, since the cylindrical battery is very small, the first positioning block and the second positioning block can provide auxiliary restraint to avoid the phenomenon of displacement during welding due to the small size of the parts, thereby improving the welding quality.

[0020] Example 1: By Figure 1 , 2As shown in 3 and 4, a cylindrical battery tab connection structure includes a housing 1, a cover 7 welded to the top of the housing 1, a positive electrode 5 welded to the inner wall of the cover 7, a negative electrode 3 welded to the bottom of the housing 1, a winding core 8 fixedly connected inside the housing 1, and an assembly mechanism 2 provided inside the housing 1. The assembly mechanism 2 includes: a mounting part 21 disposed inside the cover 7; a positive electrode tab 22 fixedly connected to the top of the winding core 8; a negative electrode tab 23 fixedly connected to the bottom of the winding core 8; a first current collector 24 sleeved on the outer wall of the negative electrode tab 23 and abutting against the lower part of the inner wall of the winding core 8 and the housing 1 respectively; two first positioning blocks 25, fixedly connected to the top two sides of the negative electrode 3 respectively, and inserted into the bottom groove of the housing 1; and two second positioning blocks 26, slidably engaged on the upper sides of the inner wall of the housing 1 respectively. The mounting part 21 and the first current collector 24 connect the positive electrode tab 22 and the negative electrode tab 23 respectively.

[0021] In the specific implementation process, it is worth noting that the welding method in this case can be laser welding, etc., and the specific method is not limited. Moreover, this is a well-known technology in the art, so it will not be elaborated on. The art should be interpreted in a broad sense. In this case, the connection between the positive electrode 5 of the battery and the cover 7 and the connection between the negative electrode 3 of the battery and the shell 1 should be sealed to avoid leakage. The specific method is not limited, as long as it meets the usage requirements. The first current collector 24 and the second current collector 212 can concentrate the current generated in the battery, thereby improving the output power of the battery.

[0022] Furthermore, the mounting part 21 includes: a connecting plate 211, which is inserted into the bottom of the positive electrode 5 of the battery; a second current collector 212, which is sleeved on the outer wall of the positive electrode tab 22 and welded and fixed to the upper part of the inner wall of the housing 1, the two sides of the outer wall of the second current collector 212 are respectively fixed to the outer walls of two second positioning blocks 26, and the top of the second current collector 212 abuts against the bottom of the connecting plate 211; wherein, the connecting plate 211 and the second current collector 212 connect the positive electrode tab 22 and the positive electrode 5 of the battery;

[0023] In the specific implementation process, it is worth noting that the connecting plate 211 can connect the second current collector 212 to the positive terminal 5 of the battery, thereby transmitting current from the positive terminal 5 of the battery. The material of the connecting plate 211 is not limited, as long as it meets the usage requirements.

[0024] Furthermore, the first current collector 24 and the second current collector 212 are tightly fitted to the negative electrode tab 23 and the positive electrode tab 22, respectively;

[0025] In the specific implementation process, it is worth noting that the close fit between the first current collector 24 and the negative electrode 23 and the second current collector 212 and the positive electrode 22 can ensure the current flow efficiency and avoid poor contact. Furthermore, there are no restrictions on the materials of the first current collector 24 and the second current collector 212, as long as they meet the usage requirements.

[0026] Furthermore, a central support member 4 is fixedly connected to the inner wall of the core 8, and the top and bottom of the central support member 4 are respectively abutted against the side of the second collector plate 212 and the first collector plate 24 that are close to each other.

[0027] In the specific implementation process, it is worth noting that the central support 4 can improve the overall strength of the battery. The specific material of the central support 4 is not limited, as long as it meets the usage requirements.

[0028] Furthermore, the outer walls of the shell 1 and the cover 7 are fitted with a protective outer skin 6;

[0029] In the specific implementation process, it is worth noting that the protective outer casing 6 can prevent the battery body from being scratched or otherwise damaged, and can also be used to label performance and precautions.

[0030] Specifically, when using the tab connection structure of this cylindrical battery, firstly, the first current collector 24 is placed inside the lower part of the housing 1, then the core 8 with the positive tab 22 and the negative tab 23 is placed in. Then, the negative electrode 3 of the battery is fixed inside the housing 1 by welding. Next, the second current collector 212 is placed on the outer wall of the positive tab 22, and the second current collector 212 is welded and fixed to the upper part of the inner wall of the housing 1. Then, the connecting plate 211 is installed on the top of the second current collector 212. Then, the positive electrode 5 of the battery is welded and fixed to the cover 7. The cover 7 is welded and fixed to the housing 1. Finally, the protective outer skin 6 is fixed to the outer wall of the housing 1 and the cover 7.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tab connecting structure of a cylindrical battery comprising a case (1), characterized by: A cover (7) is welded to the top of the housing (1), a battery positive electrode (5) is welded to the inner wall of the cover (7), a battery negative electrode (3) is welded to the bottom of the housing (1), a winding core (8) is fixedly connected inside the housing (1), and an assembly mechanism (2) is provided inside the housing (1). The assembly mechanism (2) includes: The mounting part (21) is disposed inside the cover (7); The positive electrode tab (22) is fixedly connected to the top of the winding core (8); The negative electrode tab (23) is fixedly connected to the bottom of the winding core (8); The first collector plate (24) is sleeved on the outer wall of the negative electrode ear (23) and abuts against the lower part of the inner wall of the core (8) and the housing (1); Two first positioning blocks (25) are provided, which are respectively fixedly connected to the top two sides of the negative electrode (3) of the battery and are both inserted into the bottom groove of the housing (1). Two second positioning blocks (26) are provided, which are respectively slidably engaged on the upper sides of the inner wall of the housing (1); The mounting part (21) and the first collector plate (24) are respectively connected to the positive electrode (22) and the negative electrode (23).

2. The tab connecting structure of a cylindrical battery according to claim 1, characterized by: The mounting part (21) includes: The connecting plate (211) is inserted into the bottom of the positive terminal (5) of the battery; The second collector plate (212) is sleeved on the outer wall of the positive electrode ear (22) and welded and fixed to the upper part of the inner wall of the housing (1). The outer sides of the second collector plate (212) are respectively fixed to the outer walls of the two second positioning blocks (26). The top of the second collector plate (212) abuts against the bottom of the connecting plate (211). The connecting plate (211) and the second collector plate (212) connect the positive electrode tab (22) and the positive electrode (5) of the battery.

3. The tab connecting structure of a cylindrical battery according to claim 1, wherein: The first collector plate (24) and the second collector plate (212) are tightly fitted to the negative electrode tab (23) and the positive electrode tab (22), respectively.

4. The tab connecting structure of a cylindrical battery according to claim 1, wherein: The inner wall of the core (8) is fixedly connected to a central support member (4), and the top and bottom of the central support member (4) abut against the sides of the second collector plate (212) and the first collector plate (24) respectively.

5. The tab connecting structure of a cylindrical battery according to claim 1, wherein: The outer walls of the shell (1) and the cover (7) are fitted with protective skin (6).

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