Battery assembly

Abstract

This application provides a battery assembly, which includes a battery body and tabs. The battery body includes a casing; the tabs are disposed on the casing and electrically connected to the casing. The tabs have a protrusion, and the protrusion has a receiving cavity. The receiving cavity is used to accommodate the end of a lead and a curable conductive medium connecting the lead and the cavity wall. Because the tab has a protruding receiving cavity, after the lead is placed in the receiving cavity, molten curable conductive medium can be dotted into the receiving cavity using a soldering gun, so that the curable conductive medium completely fills the cavity, thereby completely encapsulating the lead and achieving soldering between the lead and the tab. Since the receiving cavity is a three-dimensional cavity with a defined shape and size, this three-dimensional cavity can ensure the consistency of the shape and size of the solder joints of the lead and the tab, control the amount of solder used, and achieve the consistency of the shape and size of the curable conductive medium, avoiding situations such as solder joint slippage, desoldering, and excessive contact resistance.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a battery assembly. Background Technology

[0002] Current steel-cased batteries have steel ends. When soldering the steel-cased battery to the leads, the poor adhesion between the steel casing and the solder makes it easy for the solder joints to detach from the steel casing. Generally, tabs are soldered to both ends of the steel-cased battery, and then the leads and tabs are connected by soldering. However, when soldering the tabs and leads, the solder tends to flow around when applying solder to the tabs, making it difficult to ensure the consistency of the solder joints. This can lead to inconsistent solder joint shape and size, resulting in problems such as solder joint slippage, detachment, and excessive contact resistance. Utility Model Content

[0003] This application provides a battery assembly that can solve the problem of poor welding consistency between the tabs and leads.

[0004] To address the aforementioned technical problems, this application provides a battery assembly, which includes a battery body and tabs. The battery body includes a housing; tabs are disposed on the housing and electrically connected to the housing, and each tab has a protrusion with a receiving cavity within the protrusion. The receiving cavity is used to accommodate the end of a lead and a curable conductive medium connecting the lead and the cavity wall.

[0005] In one embodiment, the protrusion cooperates with the outer shell to form a receiving cavity, or the protrusion forms a receiving cavity.

[0006] In one embodiment, the sidewall or top wall of the accommodating cavity has an opening for a lead wire to pass through.

[0007] In one embodiment, the protrusion is located at the edge of the tab.

[0008] In one embodiment, the tab is formed into a protrusion by a stamping or casting process.

[0009] In one embodiment, the cavity is shaped as a cube, frustum, hemispherical, cylindrical, or ellipsoidal cavity, and the tabs are configured as pure nickel, nickel-plated steel, nickel-plated copper, copper, or aluminum tabs.

[0010] In one embodiment, the outer casing includes a positive electrode casing and a negative electrode casing, and both the positive electrode casing and the negative electrode casing are provided with tabs.

[0011] In one embodiment, the electrode tab is welded to the housing by resistance welding, and there are multiple welding points between the electrode tab and the housing.

[0012] In one embodiment, the battery body is cylindrical, the outer shell is steel, and the solidifiable conductive medium is tin.

[0013] In one embodiment, the battery assembly further includes leads and a curable conductive medium, with the ends of the leads disposed within a cavity, and the curable conductive medium filling the space between the cavity wall and the ends of the leads to electrically connect the tabs to the leads.

[0014] This application provides a battery assembly, which includes a battery body and tabs. The battery body includes a casing; the tabs are disposed on the casing and electrically connected to the casing. The tabs have a protrusion, and the protrusion has a cavity for accommodating the end of a lead and a curable conductive medium connecting the lead and the cavity wall. Because the tab has a protruding cavity, after the lead is placed in the cavity, molten curable conductive medium can be applied into the cavity using a soldering gun, so that the curable conductive medium completely fills the cavity, thus completely encapsulating the lead and achieving efficient and high-quality soldering of the lead and the tab. Since the cavity is a three-dimensional cavity with a defined shape and size, this three-dimensional cavity can ensure the consistency of the shape and size of the solder joints of the lead and the tab. Each time, only the curable conductive medium needs to be filled into the cavity, which can control the amount of solder used and achieve consistency in the shape and size of the curable conductive medium, avoiding situations such as solder joint slippage, desoldering, and excessive contact resistance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of this application;

[0016] Figure 2 A top view of a battery assembly provided in an embodiment of this application;

[0017] Figure 3 A top view of a tab provided in an embodiment of this application;

[0018] Figure 4 This is a front view of a tab provided in an embodiment of this application.

[0019] Reference numerals: battery assembly 10, battery body 11, outer casing 111, tab 12, protrusion 121, accommodating cavity 13. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0021] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0022] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0023] The terms "parallel" and "perpendicular," etc., are specific to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between A and B ranging from 0° to 10°. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between A and B ranging from 80° to 100°. The directional terms used in the embodiments of this application, such as "upper," "inner," "outer," and "side," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0024] Please refer to Figure 1 and Figure 2 This application provides a battery assembly 10, which includes a battery body 11 and tabs 12.

[0025] The battery body 11 includes a casing 111. In one embodiment, the casing 111 includes a positive electrode casing 111 and a negative electrode casing 111, both of which are provided with tabs 12 to ensure consistent welding between the positive and negative electrode casings and the leads. The battery body 11 is cylindrical, and the casing 111 can be made of steel or aluminum. The steel casing can be made of materials such as stainless steel or nickel-plated steel. The casing 111 prevents the internal components of the battery body 11 from being subjected to physical impact or compression, and it forms a sealed space to prevent electrolyte leakage. The casing 111 can serve as a current conduction path for the positive and negative electrodes; for example, the positive electrode casing 111 can be electrically connected to the positive electrode of the internal winding core, and the negative electrode casing 111 can be electrically connected to the negative electrode of the internal winding core. Furthermore, this application is suitable for different battery types besides cylindrical batteries, such as square and flexible batteries.

[0026] The electrode 12 is disposed on the housing 111 and electrically connected to the housing 111. Specifically, as shown... Figure 2 As shown, in one embodiment, the tab 12 is welded to the housing 111 by resistance welding, and there are multiple weld points between the tab 12 and the housing 111. For example, in Figure 2 In this embodiment, there are four solder joints between the tab 12 and the outer casing 111, and the four solder joints are arranged in a matrix. Of course, this application does not limit the number of solder joints between the tab 12 and the outer casing 111 or the arrangement of each solder joint. Generally, the tab 12 has a sheet-like structure, and the thickness direction of the tab 12 is consistent with the axial direction of the battery body 11.

[0027] In one embodiment, the tab 12 can be in the form of a circular, rectangular, or hollow sheet structure. The tab 12 can be configured as pure nickel, nickel-plated steel, nickel-plated copper, copper, or aluminum. Using some metal materials with high conductivity and low resistance (such as silver-plated copper foil or high-purity aluminum) can reduce the electrical loss of the tab 12 during welding and improve the overall discharge efficiency of the battery assembly 10. The size of the tab 12 can be determined based on the material of the tab 12 and calculated based on the overcurrent formula. Typically, the safe current carrying capacity of a pure nickel tab 12 is 11 A / mm². 2 -13A / mm 2 The safe current carrying capacity of copper tab 12 is 5A / mm. 2 -8 A / mm 2 The safe current carrying capacity of aluminum tab 12 is 3A / mm. 2 -5A / mm 2 .

[0028] like Figure 1 , Figure 3 and Figure 4As shown, the tab 12 has a protrusion 121, wherein, in one embodiment, the tab 12 is formed by a stamping or casting process. The protrusion 121 has a receiving cavity 13 for accommodating the end of a lead and a curable conductive medium connecting the lead and the cavity wall of the receiving cavity 13. Specifically, the curable conductive medium is tin. The curable conductive medium encapsulates the connecting lead, filling the gap between the cavity wall of the receiving cavity 13 and the connecting lead.

[0029] Because the tab 12 has a raised receiving cavity 13, after the lead wire is placed in the receiving cavity 13, molten solidifiable conductive medium can be dotted into the receiving cavity 13 using a soldering gun, so that the solidifiable conductive medium completely fills the cavity, thus completely wrapping the lead wire and achieving efficient and high-quality soldering between the lead wire and the tab 12. Since the receiving cavity 13 is a three-dimensional cavity with a defined shape and size, this three-dimensional cavity can ensure the consistency of the shape and size of the solder joints between the lead wire and the tab 12. Each time, only the solidifiable conductive medium needs to be filled into the cavity, which can control the amount of solder used, achieve consistency in the shape and size of the solidifiable conductive medium, and avoid situations such as solder joint slippage, desoldering, and excessive contact resistance.

[0030] In one embodiment, the protrusion 121 cooperates with the outer shell 111 to form a receiving cavity 13, or the protrusion 121 itself forms the receiving cavity 13. Preferably, the protrusion 121 cooperates with the outer shell 111 to form the receiving cavity 13, that is, the protrusion is in the form of a slot, and the outer shell 111 covers the slot opening to form the receiving cavity 13. By using the form of the protrusion 121 cooperating with the outer shell 111, the process is simpler, only requiring stamping to form the slot on the tab 12.

[0031] In one embodiment, the sidewall or top wall of the receiving cavity 13 has an opening for lead wires to pass through, allowing an operator to apply solder into the receiving cavity 13. The opening on the sidewall of the receiving cavity 13 allows for horizontal lead wire insertion, adapting to automated assembly lines and reducing assembly time for individual components. The opening on the top wall of the receiving cavity 13 facilitates precise soldering with a vertical soldering gun, reducing solder filling errors. The size of the opening in the receiving cavity 13 is generally matched to the soldering gun nozzle; for example, an opening diameter of 1.2 mm is used with a 1.0 mm nozzle, ensuring controlled solder flow and reducing bubble formation.

[0032] In one embodiment, the protrusion 121 is located at the edge of the tab 12. In other embodiments, the protrusion 121 may also be located at the center or other positions of the tab 12. When the protrusion 121 is located at the edge of the tab 12, the lead 12 extends from the side of the battery body, reducing spatial interference with other components, which is suitable for compact batteries, improving space utilization, and the edge cavity facilitates the positioning of solder joints by the visual inspection system, improving inspection efficiency. When the protrusion 121 is located at the center of the tab 12, the current distribution is more uniform, which is suitable for high-rate charge and discharge scenarios.

[0033] In one embodiment, the cavity 13 is shaped as a cube, frustum, hemispherical, cylindrical, or ellipsoidal cavity. That is, the cavity 13 of this application, after processing, can form a cavity with a relatively regular preset shape and size, so as to precisely control the size and shape of the solder joint.

[0034] In one embodiment, the battery assembly 10 further includes leads and a curable conductive medium, with the ends of the leads disposed within the accommodating cavity 13, and the curable conductive medium filling the space between the cavity wall of the accommodating cavity 13 and the ends of the leads, so that the tabs 12 are electrically connected to the leads.

[0035] In some embodiments, micro-bumps or grooves may be added inside the accommodating cavity 13 to increase the contact area between the curable conductive medium and the cavity wall of the accommodating cavity 13, thereby improving their bonding strength. A gold or silver layer may also be pre-plated on the inner wall of the cavity to reduce contact resistance and inhibit oxidation.

[0036] The manufacturing process of the battery module 10 in this application is as follows: 1. Tab 12 stamping: A protrusion 121 is formed on the tab 12 using a continuous stamping die. 2. Tab 12 welding: The tab 12 is positioned on the surface of the steel shell, and four solder joints are formed by applying current through a resistance welding machine. 3. Lead assembly: The end of the lead is inserted into the opening of the receiving cavity 13, fixed, and then solder is injected to fill the receiving cavity 13. After the solder cools, standardized solder joints are formed. The regular cavity of the receiving cavity 13 can constrain the flow of solder, and the shape and volume of the solder joints fluctuate very little, resulting in highly consistent solder joints, which is significantly better than the traditional sheet-shaped tab 12. The cavity structure of the receiving cavity 13 allows the solder to completely wrap the lead, avoiding cold solder joints or desoldering.

[0037] The above examples illustrate this application only to aid in understanding the invention and are not intended to limit the scope of the application. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the concept of this application.

Claims

1. A battery assembly, characterized in that, include: A battery body, the battery body including a casing; And a tab, the tab being disposed on the housing and electrically connected to the housing, the tab having a protrusion, the protrusion having a receiving cavity, the receiving cavity being used to receive the end of the lead and a curable conductive medium connecting the lead and the cavity wall of the receiving cavity.

2. The battery assembly according to claim 1, characterized in that, The protrusion cooperates with the outer shell to form the receiving cavity, or the protrusion forms the receiving cavity.

3. The battery assembly according to claim 1, characterized in that, The sidewall or top wall of the accommodating cavity has an opening for the lead wire to pass through.

4. The battery assembly according to claim 1, characterized in that, The protrusion is located at the edge of the electrode tab.

5. The battery assembly according to claim 1, characterized in that, The tab is formed by stamping or casting.

6. The battery assembly according to claim 1, characterized in that, The cavity is shaped as a cube, frustum, hemispherical, cylindrical, or ellipsoidal cavity, and the tabs are configured as pure nickel, nickel-plated steel, nickel-plated copper, copper, or aluminum tabs.

7. The battery assembly according to claim 1, characterized in that, The outer casing includes a positive electrode casing and a negative electrode casing, and the electrode tabs are provided on both the positive electrode casing and the negative electrode casing.

8. The battery assembly according to claim 1, characterized in that, The electrode tab is welded to the outer shell by resistance welding, and there are multiple welding points between the electrode tab and the outer shell.

9. The battery assembly according to claim 1, characterized in that, The battery body is cylindrical, the outer shell is steel, and the curable conductive medium is tin.

10. The battery assembly according to any one of claims 1-9, characterized in that, It also includes a lead wire and a curable conductive medium, the end of the lead wire being disposed within the accommodating cavity, and the curable conductive medium filling the space between the cavity wall and the end of the lead wire, so that the tab is electrically connected to the lead wire.

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