Pole core, battery, battery assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a pole core, a battery, a battery assembly and electric equipment, which is characterized in that the pole core comprises a pole lug, the pole lug comprises a pole lug body and a first welding mark which are connected with each other, the first welding mark is arranged on the outer surface of the pole lug body, and the pole lug body is connected with the first welding mark. The first welding mark is formed by electric resistance welding and is used for enabling the tab to form an integrated structure, the problems of air holes and chippings in traditional welding are solved, the tab can be further provided with a metal protection sheet to enhance the protection of the welding mark, and the cover plate is connected with the pole core through a second welding mark formed by laser welding. The device is suitable for various electric devices.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to an electrode core, a battery, a battery assembly, and an electrical device. Background Technology

[0002] In the existing technology, the multi-layer tab foil material in the electrode core needs to be welded into one piece to be welded to the cover plate. However, the existing welding method is prone to forming pores inside the welded tab, resulting in insufficient density of the tab, which affects the conductivity of the electrode core. At the same time, some welding methods are prone to causing metal debris to fly during the implementation process, which poses a certain risk of short circuit in the electrode core. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the multi-layer tab foil material in the electrode core needs to be welded into one piece to be welded to the cover plate. However, the existing welding method is prone to forming pores inside the welded tab, resulting in insufficient density of the tab, which affects the conductivity of the electrode core. At the same time, some welding methods are prone to causing metal debris to fly during implementation, which poses a certain risk of short circuit in the electrode core.

[0004] To solve the above-mentioned technical problems, on the one hand, there is an electrode core, the electrode core including an electrode tab, the electrode tab including a connected electrode tab body and a first solder mark, the first solder mark being disposed on the outer surface of the electrode tab body, the first solder mark being formed by resistance welding, for making the electrode tab form an integral structure.

[0005] As an optional technical solution of this utility model, the first solder mark is disposed opposite to the outer surface along the thickness direction of the electrode tab.

[0006] As an optional technical solution of this utility model, the projected area of ​​the first solder mark in the thickness direction of the electrode tab is smaller than the projected area of ​​the electrode tab body in the thickness direction of the electrode tab.

[0007] As an optional technical solution of this utility model, the electrode tab also includes a metal protective sheet, which is disposed on the outer surface of the first solder mark.

[0008] As an optional technical solution of this utility model, the projection of the metal protective sheet along the thickness direction of the tab covers the projection of the first solder mark along the thickness direction of the tab.

[0009] As an optional technical solution of this utility model, the metal protective sheet is disposed opposite to the outer surface along the thickness direction of the electrode tab.

[0010] As an optional technical solution of this utility model, the material of the metal protective sheet is the same as the material of the electrode body.

[0011] As an optional technical solution of this utility model, the metal protective sheet is simultaneously welded to the electrode body and the first solder mark.

[0012] As an optional technical solution of this utility model, the weld veins of the metal protective sheet, which are simultaneously welded to the electrode body and the first solder mark, are formed by resistance welding.

[0013] On the other hand, as an optional technical solution of this utility model, this disclosure also provides a battery, including the above-mentioned electrode core and cover plate, wherein the cover plate further includes a cover plate body and a second weld mark, the second weld mark being formed by laser welding, and the second weld mark being used to connect the electrode core and the cover plate.

[0014] On the other hand, as an optional technical solution of this utility model, this disclosure also provides a battery assembly, including the battery described above.

[0015] On the other hand, as an optional technical solution of this utility model, this disclosure also provides an electrical device, characterized in that it includes the above-mentioned battery assembly or the above-mentioned battery.

[0016] The beneficial effects of this utility model are as follows: An electrode core includes an electrode tab, which comprises a connected electrode tab body and a first solder mark. The first solder mark is disposed on the outer surface of the electrode tab body and is formed by resistance welding, thereby enabling the electrode tab to form an integral structure. By welding multiple layers of foil together using resistance welding, the electrode tab forms a stable and flat integral structure. Compared to the solder marks left by traditional laser welding and ultrasonic welding, this method improves the density and conductivity of the electrode tab, reduces the risk of short circuits in the electrode core, and enhances structural stability and process adaptability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a partial structural diagram of a battery according to some embodiments of the present invention. Figure 1 ;

[0019] Figure 2 This is a partial three-dimensional structural diagram of a battery according to some embodiments of the present invention. Figure 2 ;

[0020] Figure 3 This is a partial exploded structure diagram of a battery according to some embodiments of the present invention. Figure 3 ;

[0021] Figure 4 This is a partial three-dimensional structural diagram of a battery according to some embodiments of the present invention. Figure 4 ;

[0022] The reference numerals in the accompanying drawings are as follows:

[0023] 1. Electrode core; 11. Electrode tab; 111. Electrode tab body; 112. First solder mark; 113. Metal protective sheet; 2. Cover plate; 21. Cover plate body; 22. Second solder mark. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] The present invention provides a detailed description of an electrode core, a battery, a battery assembly, and an electrical device.

[0026] In optional embodiments of this disclosure, such as Figure 1-4 A battery is provided, comprising an electrode core 1 and a cover plate 2. The cover plate 2 further comprises a cover plate body 21 and a second weld mark 22, which is formed by laser welding and is used to connect the electrode core 1 and the cover plate 2. Specifically, the second weld mark 22 of the cover plate 2 is formed by laser welding. Utilizing the concentrated energy of the laser, high-precision welding of the electrode core 1 and the cover plate 2 is achieved, reducing the heat-affected zone and avoiding damage to the internal structure of the electrode core 1.

[0027] The aforementioned electrode core 1 includes an electrode tab 11, which comprises a connected electrode tab body 111 and a first solder mark 112. The first solder mark 112 is disposed on the outer surface of the electrode tab body 111 and is formed by resistance welding to make the electrode tab 11 form an integral structure. Specifically, the electrode tab 11 is composed of multiple layers of metal foil, which are welded together using resistance welding. The portion of the weld vein exposed on the outer surface of the electrode tab body 111 is the first solder mark 112. The surface of the first solder mark 112 is smoother and has fewer pores than solder marks formed by traditional laser welding or ultrasonic welding, which improves the density and conductivity of the electrode tab, reduces the risk of short circuit in the electrode core, and enhances structural stability and process adaptability. Specifically, the welding pressure of resistance welding can be 1-4 kN; the welding time can be 0.5-2 s; and the welding current can be 10-25 kA. Specifically, the first solder mark 112 can be rectangular or other polygonal shapes. Resistance welding melts the foil of the tab body 111 through the resistance heat generated by the current, forming a dense first weld mark 112, avoiding the problem of reduced conductive cross-sectional area caused by porosity in traditional welding methods, and ensuring a continuous low resistance current conduction path.

[0028] In some embodiments, the first solder marks 112 are disposed opposite to each other on the outer surface of the tab 11 along the thickness direction. Specifically, the projections of the first solder marks 112 along the thickness direction of the tab 11 can coincide because the electrodes of the resistance welding apply pressure to both ends of the tab 11. The first solder marks 112 being disposed opposite to each other on the outer surface of the tab 11 along the thickness direction forms a symmetrical welding structure, uniformly distributes welding stress, improves the overall connection strength of the tab 11, and reduces the risk of breakage.

[0029] In some embodiments, the projected area of ​​the first solder mark 112 in the thickness direction of the tab 11 is smaller than the projected area of ​​the tab body 111 in the thickness direction of the tab 11. Specifically, the projected area of ​​the first solder mark 112 is smaller than that of the tab body 111 to avoid material embrittlement caused by excessive welding, and to maintain the mechanical flexibility of the tab body 111 while ensuring the welding strength.

[0030] In some embodiments, such as Figure 1-4The electrode core 1 includes an electrode tab 11, which consists of an electrode tab body 111 and a first solder mark 112. The electrode tab body 111 is a multi-layer foil stacked structure (such as copper foil or aluminum foil) used for conducting current. The first solder mark 112 is formed on the outer surface of the electrode tab body 111 by resistance welding. Specifically, the multi-layer foil of the electrode tab body 111 is placed between resistance welding electrodes, a predetermined pressure is applied and a welding current is passed through. The foil partially melts and solidifies under the action of resistance heat, forming the first solder mark 112 connected to the electrode tab body 11, so that the multi-layer foil is welded into a single structure. The first solder mark 112 is arranged opposite to the upper and lower outer surfaces in the thickness direction of the electrode tab 11 (i.e., there is a solder mark on both the upper and lower surfaces), such as... Figure 1-4 As shown, its projected area in the thickness direction is smaller than the projected area of ​​the tab body 111, ensuring that the welding area is concentrated at the edge of the foil or in a specific stress area, thus ensuring welding strength and avoiding excessive melting that could affect the performance of the foil.

[0031] In some embodiments, the tab 11 further includes a metal protective sheet 113, which is disposed on the outer surface of the first solder mark 112. Specifically, the metal protective sheet 113 covers the outer surface of the first solder mark 112, which can effectively prevent damage to the solder mark from external mechanical impact or chemical corrosion and extend the service life of the electrode core.

[0032] In some embodiments, the projection of the metal protective sheet 113 along the thickness direction of the tab 11 covers the projection of the first solder mark 112 along the thickness direction of the tab 11. Specifically, the projection of the metal protective sheet 113 covers the projection 112 of the first solder mark, ensuring that the solder mark is completely covered by the protective sheet, improving the protection effect and avoiding oxidation or breakage caused by exposed solder mark edges.

[0033] In some embodiments, the metal protective sheet 113 is disposed opposite to each other on the outer surface of the tab 11 along the thickness direction. Specifically, the metal protective sheet 113 is disposed opposite to each other on both sides of the tab 11 in the thickness direction to form bidirectional protection, balance external forces, and prevent the tab 11 from deforming or cracking of the solder joint due to unilateral force.

[0034] In some embodiments, the metal protective sheet 113 is made of the same material as the tab body 111. Specifically, the metal protective sheet 113 and the tab body 111 are made of the same material to avoid corrosion problems caused by differences in the electrochemical properties of different materials and to ensure the electrochemical stability of the overall structure.

[0035] In some embodiments, the metal protective sheet 113 is simultaneously welded to the tab body 111 and the first solder mark 112.

[0036] In some embodiments, the weld veins formed by the metal protective sheet 113 simultaneously welding to the tab body 111 and the first solder mark 112 are formed by resistance welding. Specifically, the metal protective sheet 113 is connected to both the tab body 111 and the first solder mark 112 simultaneously by resistance welding, forming an integrated structure of "tab body 111 - first solder mark 112 - metal protective sheet 113", which improves interlayer bonding and reduces the risk of interface detachment.

[0037] In some embodiments, such as Figure 1-4 A metal protective plate 113 is added to the tab 11. The metal protective plate 113 is made of the same material as the tab body 111 (such as copper or aluminum), and its size is designed so that its projection in the thickness direction of the tab covers the projection of the first solder mark 112, ensuring complete coverage of the first solder mark 112. The metal protective plate 113 is disposed opposite to the upper and lower outer surfaces in the thickness direction of the tab 11, respectively covering the first solder mark 112 on the upper and lower surfaces. The metal protective plate 113 is connected to the tab body 111 and the first solder mark 112 by resistance welding: during welding, the metal protective plate 113 is placed on the outer surface of the first solder mark 112, pressure is applied by the electrode and current is passed through, so that a new weld vein (also formed by resistance welding) is formed between the protective plate, the tab body, and the solder mark, achieving a firm connection between the three. This structure effectively protects the first solder mark 112 from external damage, while enhancing the overall mechanical strength of the tab.

[0038] In some embodiments, a battery assembly is provided, specifically, the battery assembly is composed of a plurality of the above-described batteries connected in series or in parallel.

[0039] In some embodiments, an electrical device is provided, including the battery assembly or the battery described above. The battery assembly or battery is disposed inside the electrical device and is used to provide power for the operation of the electrical device. The battery assembly can be an electrical device such as a new energy vehicle, a ship, or an energy storage device.

[0040] In some embodiments, such as Figure 1-4 The battery includes the aforementioned electrode core 1 and cover plate 2. The cover plate body 21 of the cover plate 2 is a metal sheet, and the second weld mark 22 is formed by laser welding, used to connect the electrode tab 11 to the cover plate body 21. Specifically, the welding end of the electrode tab 11 (such as the area with the metal protective sheet 113) is aligned with the welding area of ​​the cover plate body 21, and a high-energy laser beam is emitted using a laser welding machine to rapidly melt the metal in a localized area, forming the second weld mark 22, thus achieving both electrical and mechanical connection between the electrode core 1 and the cover plate 2. The battery assembly consists of multiple batteries connected in series or parallel. Electrical devices (such as electric vehicles, energy storage devices, etc.) obtain efficient and safe power supply by integrating this battery assembly or individual batteries.

[0041] This utility model relates to the field of battery technology, providing a core 1, a battery, a battery assembly, and an electrical device. The core 1 includes a tab 11, which comprises a tab body 111 connected to the core and a first solder mark 112. The first solder mark 112 is disposed on the outer surface of the tab body 111 and is formed by resistance welding, thereby making the tab 11 an integral structure. The core 1 includes a tab 11, which is composed of a tab body 111 and a first solder mark 112. The tab body 111 is a multi-layer foil stacked structure (such as copper foil or aluminum foil) used for conducting current. The first solder mark 112 is formed on the outer surface of the tab body 111 by resistance welding. Specifically, the multi-layer foil of the tab body 111 is placed between resistance welding electrodes, a predetermined pressure is applied, and a welding current is passed through. The foil partially melts and solidifies under resistance heat, forming the first solder mark 112 connected to the tab body 11, thus welding the multi-layer foil into an integral structure. The first solder mark 112 is disposed opposite to each other on the upper and lower outer surfaces in the thickness direction of the tab 11 (i.e., solder marks are present on both the upper and lower surfaces), such as Figure 1-4 As shown, its projected area in the thickness direction is smaller than the projected area of ​​the tab body 111, ensuring that the welding area is concentrated at the edge of the foil or in a specific stress area, thus ensuring welding strength and avoiding excessive melting that could affect the performance of the foil.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," 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 communication 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.

[0045] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An electrode core (1), characterized in that, The electrode core (1) includes an electrode tab (11), the electrode tab (11) includes a connected electrode tab body (111) and a first solder mark (112), the first solder mark (112) is disposed on the outer surface of the electrode tab body (111), the first solder mark (112) is formed by resistance welding, and is used to make the electrode tab (11) form an integral structure.

2. The electrode core (1) according to claim 1, characterized in that, The first solder mark (112) is disposed opposite to the outer surface along the thickness direction of the tab (11).

3. The electrode core (1) according to claim 1, characterized in that, The first solder mark (112) has a projected area in the thickness direction of the tab (11) that is smaller than the projected area of ​​the tab body (111) in the thickness direction of the tab (11).

4. The electrode core (1) according to claim 1, characterized in that, The tab (11) also includes a metal protective sheet (113), which is disposed on the outer surface of the first solder mark (112).

5. The electrode core (1) according to claim 4, characterized in that, The projection of the metal protective sheet (113) along the thickness direction of the tab (11) covers the projection of the first solder mark (112) along the thickness direction of the tab (11).

6. The electrode core (1) according to claim 4, characterized in that, The metal protective sheet (113) is disposed opposite to the outer surface along the thickness direction of the tab (11).

7. The electrode core (1) according to claim 4, characterized in that, The material of the metal protective plate (113) is the same as the material of the electrode body (111).

8. The electrode core (1) according to claim 4, characterized in that, The metal protective sheet (113) is simultaneously welded to the tab body (111) and the first solder mark (112).

9. The electrode core (1) according to claim 4, characterized in that, The weld veins formed by the metal protective sheet (113) being simultaneously welded to the tab body (111) and the first solder mark (112) are formed by resistance welding.

10. A battery, characterized in that, The device includes the electrode core (1) and cover plate (2) as described in any one of claims 1-9, wherein the cover plate (2) further includes a cover plate body (21) and a second solder mark (22), the second solder mark (22) being formed by laser welding and the second solder mark (22) being used to connect the electrode core (1) and the cover plate (2).

11. A battery assembly, characterized in that, Includes the battery as described in claim 10.

12. An electrical appliance, characterized in that, Includes the battery assembly of claim 11, or the battery of claim 10.

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