Battery structure and electric equipment

Abstract

The utility model provides a battery structure and electric equipment, the battery structure comprises a battery cell, a top plate structure and a direct connection welding plate, the battery cell is provided with a plurality of layers of tabs, the plurality of layers of tabs are welded and connected, and ultrasonic pre-welding marks are formed; the top plate structure is provided with poles; the direct-connection welding plate is arranged on the top plate structure, and the direct-connection welding plate is connected with the pole in a welding manner; wherein the multiple layers of tabs with the ultrasonic pre-welding marks are connected with the direct connection welding plate in a welded mode, laser welding marks are formed, and the width w1 of the ultrasonic pre-welding marks and the width w2 of the laser welding marks meet the condition that w1 is larger than w2. According to the utility model, the problem that the fast charging capability of the battery structure in the prior art cannot be effectively guaranteed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery fast charging, and in particular to a battery structure and an electrical device. Background Art

[0002] With the rapid development of electric vehicles such as electric cars, electric ships, and electric motorcycles, the demand for lithium-ion batteries is increasing. At the same time, electric vehicles are increasingly requiring faster battery charging. Improving the fast charging capability of batteries has become a major research topic in the battery industry.

[0003] Compared to wound batteries, laminated lithium batteries utilize their internal space more efficiently and offer higher energy density. Therefore, laminated lithium batteries will be the trend of future development. In the design of existing square aluminum-cased lithium-ion power cells, reducing DCR (direct current resistance) can help improve the fast-charging capability of lithium batteries. Therefore, reducing the DCR (direct current resistance) of lithium battery cells has become a major challenge in cell design. Utility Model Content

[0004] The main purpose of the present utility model is to provide a battery structure and an electrical device to solve the problem that the fast charging capability of the battery structure in the prior art cannot be effectively guaranteed.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a battery structure is provided, including a battery cell, a top plate structure and a direct welding plate, wherein the battery cell has a plurality of layers of pole tabs, which are welded together to form an ultrasonic pre-weld mark; the top plate structure has a pole; the direct welding plate is arranged on the top plate structure, and the direct welding plate is welded to the pole; wherein the multi-layer pole tabs with the ultrasonic pre-weld mark are welded to the direct welding plate to form a laser weld mark, and the width w1 of the ultrasonic pre-weld mark and the width w2 of the laser weld mark satisfy: w1>w2.

[0006] In an exemplary embodiment, the width w1 of the ultrasonic pre-weld stamp is in the range of 10 mm ≤ w1 ≤ 20 mm; and / or the length L1 of the ultrasonic pre-weld stamp is in the range of 40 mm ≤ L1 ≤ 60 mm.

[0007] In an exemplary embodiment, the width w2 of the laser weld mark is in the range of 1 mm ≤ w2 ≤ 3 mm.

[0008] In an exemplary embodiment, the length L2 of the laser weld mark is in the range of 25 mm ≤ L2 ≤ 45 mm.

[0009] In one exemplary embodiment, the ultrasonic pre-weld mark includes at least two weld marks.

[0010] In an exemplary embodiment, the welding position between the multi-layer tab having the ultrasonic pre-welding mark and the direct-connection welding plate is located at the ultrasonic pre-welding mark.

[0011] In one exemplary embodiment, the weld area of ​​the ultrasonic pre-weld is larger than the weld area of ​​the laser weld.

[0012] In an exemplary embodiment, the direct-connected welding plate has a welding area and a non-welding area, and at least the outer contour line of the welding area is adapted to the outer contour line of the ultrasonic pre-welding mark; the projection of the ultrasonic pre-welding mark in the thickness direction of the top plate structure covers part of the welding area and part of the non-welding area, and the laser welding mark is located at the welding area.

[0013] In an exemplary embodiment, the height of the multi-layer tab with ultrasonic pre-weld stamp after cutting is H, wherein 16 mm ≤ H ≤ 24 mm.

[0014] According to another aspect of the present invention, an electrical device is provided, including a battery structure, which is the battery structure described above.

[0015] By applying the technical solution of the present utility model, a battery structure is provided, which includes a battery cell, a top plate structure and a direct-connected welding plate, wherein the battery cell has a plurality of layers of pole tabs, which are welded to each other to form an ultrasonic pre-weld mark; the top plate structure has a pole; the direct-connected welding plate is arranged on the top plate structure, and the direct-connected welding plate is welded to the pole; wherein the multi-layer pole tabs with the ultrasonic pre-weld mark are welded to the direct-connected welding plate to form a laser weld mark, and the width w1 of the ultrasonic pre-weld mark and the width w2 of the laser weld mark satisfy: w1>w2. By setting a direct-connect welding plate, at the same time, setting the width w1 of the ultrasonic pre-weld mark and the width w2 of the laser weld mark to satisfy the structural form of: w1>w2, in this way, since the width w1 of the ultrasonic pre-weld mark is greater than the width w2 of the laser weld mark, it is beneficial to reduce the electron conduction resistance during the charging process, thereby constructing an electron highway, significantly reducing the DCR (direct current resistance) of the battery cell, further reducing the temperature rise of the battery structure during the charging process, greatly improving the fast charging capability of the battery structure, and thus meeting the high-rate fast charging requirements of electrical equipment, ensuring the charging reliability of electrical equipment, and significantly improving the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a battery cell according to an optional embodiment of the present invention is shown;

[0018] Figure 2 Shown Figure 1 A schematic diagram of the structure of a battery cell in a state where the tabs of the battery cell are ultrasonically welded on a welding seat;

[0019] Figure 3 Shown Figure 1 A schematic diagram of the structure of the tabs of a battery cell with a battery structure in FIG. 1 after the tabs have been cut;

[0020] Figure 4 Shown Figure 3 A schematic diagram of the structure of the battery cell after the tab is cut off from the side;

[0021] Figure 5 A schematic diagram showing the structure of the battery structure with two cells, a top plate structure, and a directly connected welding plate in an assembled state;

[0022] Figure 6 Shown Figure 5 A schematic structural diagram of a battery structure from a side view;

[0023] Figure 7 Shown Figure 5 Schematic diagram of the structure when the top plate structure and the direct-connected welding plate of the battery structure are in the assembled state.

[0024] The above drawings include the following reference numerals:

[0025] 1. Welding seat;

[0026] 10. Battery cell; 11. Tab; 12. Ultrasonic pre-welding;

[0027] 20. Top plate structure;

[0028] 30. Directly connected welding plate; 31. Laser welding mark; 32. Welding area; 33. Non-welding area. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In order to solve the problem that the fast charging capability of the battery structure in the prior art cannot be effectively guaranteed, the utility model provides a battery structure and an electrical device, wherein the electrical device includes a battery structure, and the battery structure is the battery structure described above and below.

[0031] like Figures 1 to 7 As shown, the battery structure includes a battery cell 10, a top plate structure 20 and a direct welding plate 30, wherein the battery cell 10 has a multi-layer tab 11, the multi-layer tabs 11 are welded to each other, and an ultrasonic pre-weld mark 12 is formed; the top plate structure 20 has a pole; the direct welding plate 30 is arranged on the top plate structure 20, and the direct welding plate 30 is welded to the pole; wherein the multi-layer tab 11 with the ultrasonic pre-weld mark 12 is welded to the direct welding plate 30, and a laser weld mark 31 is formed, and the width w1 of the ultrasonic pre-weld mark 12 and the width w2 of the laser weld mark 31 satisfy: w1>w2.

[0032] By applying the technical solution of the present invention, a battery structure is provided, which includes a battery cell 10, a top plate structure 20 and a direct-connected welding plate 30, wherein the battery cell 10 has a multi-layer pole tab 11, which is welded to each other to form an ultrasonic pre-weld mark 12; the top plate structure 20 has a pole; the direct-connected welding plate 30 is arranged on the top plate structure 20, and the direct-connected welding plate 30 is welded to the pole; wherein the multi-layer pole tab 11 with the ultrasonic pre-weld mark 12 is welded to the direct-connected welding plate 30 to form a laser weld mark 31, and the width w1 of the ultrasonic pre-weld mark 12 and the width w2 of the laser weld mark 31 satisfy: w1>w2. By setting a direct-connected welding plate 30, at the same time, the width w1 of the ultrasonic pre-weld mark 12 and the width w2 of the laser weld mark 31 are set to a structural form that satisfies: w1>w2. In this way, since the width w1 of the ultrasonic pre-weld mark 12 is greater than the width w2 of the laser weld mark 31, it is beneficial to reduce the electron conduction resistance during the charging process, thereby constructing an electron highway, so that the DCR (direct current resistance) of the battery cell 10 is significantly reduced, further reducing the temperature rise of the battery structure during charging, greatly improving the fast charging capability of the battery structure, and thus meeting the high-rate fast charging requirements of electrical equipment, ensuring the charging reliability of electrical equipment, and significantly improving the charging efficiency.

[0033] It should be noted that in this application, the DCR (direct current resistance) of the battery cell can be decomposed into the ohmic polarization internal resistance (R I ), boundary reverse polarization internal resistance (R ct ) and concentration polarization internal resistance (R c ), the interfacial polarization internal resistance is mainly generated in the process of initially establishing the interface potential, the concentration polarization internal resistance is caused by the concentration difference inside and outside the electrode, and the ohmic polarization internal resistance is composed of electronic resistance (contact) and solution resistance (diaphragm).

[0034] The following briefly introduces the current status of existing battery structures and further explains the defects of each battery structure:

[0035] 1. The welding method of the tabs and connecting pieces of aluminum shell batteries is usually butterfly welding. The corresponding components include: auxiliary welding pieces, connecting pieces, and core packs;

[0036] 2. The battery cell with double winding core with the lead-out tab on the same side generally adopts multi-tab, which is welded to the core package through the connecting pieces on both sides, and the welding method is usually ultrasonic welding;

[0037] 3. The winding core and the connecting piece of the lead-out tab on the same side are welded by ultrasonic welding, and then the connecting piece is laser welded to the pole;

[0038] The defects of the above-mentioned battery structures are:

[0039] 1. The tabs of the winding core with the tabs leading out on the same side are smaller, resulting in a smaller weldable area between the tabs and the connecting piece, which cannot meet the overcurrent capacity requirements of the fast-charging battery.

[0040] 2. The insufficient overcurrent capacity of the tabs and connecting pieces of the winding core leads to a higher DCR (direct current resistance) of the battery cell and a higher temperature rise during high-rate charging, thereby reducing the cycle life of the battery cell.

[0041] 3. After the tabs are welded to the connecting pieces, they are laser welded to the poles. The process is complicated and the production efficiency is low.

[0042] According to the above analysis and the current status of existing battery structures, the most effective way to reduce the DCR (DC resistance) of the battery cell is to reduce the ohmic polarization internal resistance R I ,like Figure 1 and Figure 2 As shown, the present application provides a tab design and laser welding method for a laminated fast-charge lithium battery. The battery structure has a multi-layer tab 11. The multi-layer tabs 11 are welded to each other and form an ultrasonic pre-welding mark 12. The multi-layer tab 11 with the ultrasonic pre-welding mark 12 is welded to the direct welding plate 30 and forms a laser welding mark 31. The implementation method is to first place the multi-layer tab 11 on the welding seat 1 for ultrasonic pre-welding, and then cut the multi-layer tab 11 with the ultrasonic pre-welding mark 12 after pre-welding and connect the cut multi-layer tab 11 with the ultrasonic pre-welding mark 12 to the direct welding plate 30. Figure 7The direct-connect welding plate 30 shown is connected by laser welding. The multi-layer tabs 11 in this application include multi-layer positive tabs and multi-layer negative tabs. The ultrasonic pre-weld marks 12 formed on the multi-layer positive tabs are double or multiple weld marks, and the ultrasonic pre-weld marks 12 formed on the multi-layer negative tabs are double or multiple weld marks. The widened design of the ultrasonic pre-weld marks 12 of the battery cell 10 is conducive to increasing the weld mark area of ​​the tab laser welding, reducing the electron conduction resistance during the charging process, building an electron highway, significantly reducing the DCR (direct current resistance) of the battery cell, and at the same time reducing the temperature rise during charging, meeting the needs of high-rate fast charging.

[0043] It should be noted that in this application, Figure 1 As shown, the range of the width w1 of the ultrasonic pre-weld mark 12 is: 10mm≤w1≤20mm; and / or the range of the length L1 of the ultrasonic pre-weld mark 12 is: 40mm≤L1≤60mm. By reasonably optimizing the range of the width w1 of the ultrasonic pre-weld mark 12, it is avoided that the welding connection stability between the multi-layer tabs 11 cannot be ensured due to the width w1 of the ultrasonic pre-weld mark 12 being too small, and it is also avoided that the welding reliability between the multi-layer tabs 11 with the ultrasonic pre-weld mark 12 and the direct-connection welding plate 30 is affected due to the width w1 of the ultrasonic pre-weld mark 12 being too large. In addition, by reasonably optimizing the range of the length L1 of the ultrasonic pre-weld mark 12, it is avoided that the welding stability between the multi-layer tabs 11 cannot be ensured due to the length L1 of the ultrasonic pre-weld mark 12 being too small, and it is also avoided that interference occurs during laser welding between the multi-layer tabs 11 with the ultrasonic pre-weld mark 12 and the direct-connection welding plate 30 due to the length L1 of the ultrasonic pre-weld mark 12 being too large.

[0044] It should be noted that, in the present application, since the laser beam is sensitive to the gap between the welding material layers, when the number of layers of the tab 11 is large, the larger the gap between the tabs 11 at the bottom of the multi-layer tab 11, the more difficult it is for the laser to penetrate, which is easy to cause a cold weld. The tighter the gap between the tab layers, the better the fusion of the substrate, which is not easy to cause a cold weld. Therefore, the present application adopts an ultrasonic pre-welding method, by placing the multi-layer tab 11 on the welding seat 1 for ultrasonic pre-welding (for details, please refer to Figure 2 ), this ultrasonic pre-welding method can minimize the layer gap between two adjacent tabs 11 as much as possible, so that the multi-layer tabs 11 form a tight whole after ultrasonic pre-welding, reducing abnormalities such as cold welding that may occur during laser welding.

[0045] like Figure 5As shown, it should be noted that in this application, the range of the width w2 of the laser weld mark 31 is: 1mm≤w2≤3mm. In this way, by reasonably optimizing the range of the width w2 of the laser weld mark 31, it is possible to avoid the inability to ensure the welding reliability of the multi-layer tab 11 with the ultrasonic pre-weld mark 12 and the direct welding plate 30 due to the width w2 of the laser weld mark 31 being too small. It is also possible to avoid the serious impact of the subsequent assembly relationship between the battery cell 10 and the top plate structure 20 due to the excessively wide laser weld mark 31 due to the excessive width w2 of the laser weld mark 31.

[0046] like Figure 1 As shown, it should be noted that in this application, the range of the length L1 of the ultrasonic pre-weld mark 12 is: 40mm≤L1≤60mm. In this way, by reasonably optimizing the range of the length L1 of the ultrasonic pre-weld mark 12, it is possible to avoid the inability to ensure welding stability between the multi-layer tabs 11 due to the length L1 of the ultrasonic pre-weld mark 12 being too small, and it is also possible to avoid interference during laser welding between the multi-layer tabs 11 having the ultrasonic pre-weld mark 12 and the direct-connection welding plate 30 due to the length L1 of the ultrasonic pre-weld mark 12 being too large.

[0047] like Figure 5 As shown, it should be noted that in this application, the range of the length L2 of the laser weld mark 31 is: 25mm≤L2≤45mm. In this way, by reasonably optimizing the range of the length L2 of the laser weld mark 31, it is possible to avoid that the welding reliability between the multi-layer tab 11 with the ultrasonic pre-weld mark 12 and the direct-connection welding plate 30 is affected due to the length L2 of the laser weld mark 31 being too small. It is also possible to avoid that the length L2 of the laser weld mark 31 is too large, which seriously affects the subsequent assembly relationship between the battery cell 10 and the top plate structure 20 and causes interference due to the excessively wide laser weld mark 31.

[0048] It should be noted that in the present application, the ultrasonic pre-weld mark 12 includes at least two weld marks. Thus, by configuring the ultrasonic pre-weld mark 12 to include at least two weld marks, the weld area of ​​the ultrasonic pre-weld mark 12 is greatly increased, thereby reducing the electron transfer resistance of the battery structure during the charging process, further constructing an electron highway, and enabling the DCR (direct current resistance) of the battery cell 10 to be significantly reduced. In addition, when the electrical equipment is charged through the battery structure, the temperature rise during the charging process can be reduced as much as possible, thereby meeting the high-rate fast charging requirements of the electrical equipment and greatly improving the fast charging capability of the battery structure.

[0049] It should be noted that the ultrasonic pre-weld mark 12 comprising at least two weld marks specifically means that the ultrasonic pre-weld mark 12 comprises two or more weld marks arranged at intervals.

[0050] It should be further noted that, in the present application, the welding position of the multi-layer tab 11 with the ultrasonic pre-weld mark 12 and the direct-connected welding plate 30 is located at the ultrasonic pre-weld mark 12. In this way, by locating the welding position of the multi-layer tab 11 with the ultrasonic pre-weld mark 12 and the direct-connected welding plate 30 at the ultrasonic pre-weld mark 12, it is beneficial to avoid occupying other parts of the battery structure for welding, and it is also possible to ensure the reliability of the connection between the battery cell 10 and the top plate structure 20 by superimposing multiple welds.

[0051] like Figure 5 As shown, the weld area of ​​the ultrasonic pre-weld mark 12 is larger than the weld area of ​​the laser weld mark 31. Thus, by setting the weld area of ​​the ultrasonic pre-weld mark 12 larger than the weld area of ​​the laser weld mark 31, the electron conduction resistance of the battery structure during charging is reduced, further constructing an electron highway, thereby significantly reducing the DCR (direct current resistance) of the battery cell 10. In addition, when the electrical device is charged through the battery structure, the temperature rise during the charging process can be minimized, thereby meeting the electrical device's demand for high-rate fast charging and greatly improving the fast charging capability of the battery structure.

[0052] like Figure 5 and Figure 7 As shown, the direct-connected welding plate 30 has a welding area 32 and a non-welding area 33, and at least the outer contour line of the welding area 32 is adapted to the outer contour line of the ultrasonic pre-welding mark 12; the projection of the ultrasonic pre-welding mark 12 in the thickness direction of the top plate structure 20 covers part of the welding area 32 and part of the non-welding area 33, and the laser welding mark 31 is located at the welding area 32. In this way, by setting the direct-connected welding plate 30 into a structural form with a welding area 32 and a non-welding area 33, at the same time, at least the outer contour line of the welding area 32 is adapted to the outer contour line of the ultrasonic pre-welding mark 12; the projection of the ultrasonic pre-welding mark 12 in the thickness direction of the top plate structure 20 covers part of the welding area 32 and part of the non-welding area 33, and the laser welding mark 31 is located at the welding area 32, while ensuring the welding reliability of the direct-connected welding plate 30 and the pole on the top plate structure 20, it can also ensure the welding reliability of the welding area 32 of the direct-connected welding plate 30 and the multi-layer pole ear 11. In addition, the welding area 32 and the non-welding area 33 jointly provide a stable support for the ultrasonic pre-welding mark 12.

[0053] like Figure 3As shown, the height H of the multi-layered tab 11 with the ultrasonic pre-weld mark 12 after cutting is, where 16 mm ≤ H ≤ 24 mm. Thus, by rationally optimizing the height H of the multi-layered tab 11 with the ultrasonic pre-weld mark 12 after cutting, the reliability of laser welding between the multi-layered tab 11 and the welding area 32 of the direct-connection welding plate 30 can be avoided due to the height H of the multi-layered tab 11 with the ultrasonic pre-weld mark 12 being too small after cutting. Furthermore, interference can be avoided when the tabs 11 of the same polarity of two battery cells 10 are respectively welded to the welding area 32 of the same direct-connection welding plate 30 due to the height H of the multi-layered tab 11 with the ultrasonic pre-weld mark 12 being too large after cutting.

[0054] The present application provides a battery structure, which includes a battery cell 10, a top plate structure 20 and a direct welding plate 30, wherein the battery cell 10 has a multi-layer pole tab 11, which is welded to each other to form an ultrasonic pre-weld mark 12; the top plate structure 20 has a pole; the direct welding plate 30 is arranged on the top plate structure 20, and the direct welding plate 30 is welded to the pole; wherein the multi-layer pole tab 11 with the ultrasonic pre-weld mark 12 is welded to the direct welding plate 30 to form a laser weld mark 31, and the width w1 of the ultrasonic pre-weld mark 12 and the width w2 of the laser weld mark 31 satisfy: w1>w2. By setting a direct-connected welding plate 30, at the same time, the width w1 of the ultrasonic pre-weld mark 12 and the width w2 of the laser weld mark 31 are set to a structural form that satisfies: w1>w2. In this way, since the width w1 of the ultrasonic pre-weld mark 12 is greater than the width w2 of the laser weld mark 31, it is beneficial to reduce the electron conduction resistance during the charging process, thereby constructing an electron highway, so that the DCR (direct current resistance) of the battery cell 10 is significantly reduced, further reducing the temperature rise of the battery structure during charging, greatly improving the fast charging capability of the battery structure, and thus meeting the high-rate fast charging requirements of electrical equipment, ensuring the charging reliability of electrical equipment, and significantly improving the charging efficiency.

[0055] The direct-connected welded fast-charging lithium battery provided in this application can improve the fast-charging capability, while simplifying the process flow and improving the battery production efficiency.

[0056] The laser welding method for the multi-electrode core pack of the battery structure provided in this application can be compatible with battery cells of various thicknesses and sizes, thereby increasing the diversity of product design, simplifying the process flow, and improving production efficiency.

[0057] The protection points of this application are as follows:

[0058] 1. The above-mentioned tab design and ultrasonic welding method and laser welding method, the two multi-tab core packs have two or more ultrasonic pre-weld marks, and the tabs and cover plates are connected by laser welding marks;

[0059] 2. The battery structure includes the above-mentioned multi-layer tabs 11, welding method, and two laminated batteries with multi-tab core packages.

[0060] 3. A laminated battery comprising the above-mentioned directly connected welding plate.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A battery structure, characterized in that: include: A battery core (10), wherein the battery core (10) has multiple layers of tabs (11), and the multiple layers of tabs (11) are welded to form an ultrasonic pre-weld mark (12); A top plate structure (20), wherein the top plate structure (20) has a pole; a directly connected welding plate (30), the directly connected welding plate (30) being arranged on the top plate structure (20), and the directly connected welding plate (30) being welded to the pole; The multilayer tabs (11) having the ultrasonic pre-weld mark (12) are welded to the directly connected welding plate (30) to form a laser weld mark (31), and the width w1 of the ultrasonic pre-weld mark (12) and the width w2 of the laser weld mark (31) satisfy the following relationship: w1>w2.

2. The battery structure according to claim 1, characterized in that: The width w1 of the ultrasonic pre-welding print (12) is in the range of 10 mm ≤ w1 ≤ 20 mm; and / or, The length L1 of the ultrasonic pre-welding stamp (12) is in the range of 40 mm ≤ L1 ≤ 60 mm.

3. The battery structure according to claim 1, characterized in that: The width w2 of the laser welding mark (31) is in the range of 1 mm ≤ w2 ≤ 3 mm.

4. The battery structure according to claim 1, characterized in that: The length L2 of the laser welding mark (31) is in the range of 25 mm ≤ L2 ≤ 45 mm.

5. The battery structure according to claim 1, characterized in that: The ultrasonic pre-welding mark (12) includes at least two welding marks.

6. The battery structure according to claim 1, characterized in that: The welding position of the multi-layered tab (11) having the ultrasonic pre-welding mark (12) and the direct-connection welding plate (30) is located at the ultrasonic pre-welding mark (12).

7. The battery structure according to claim 6, characterized in that: The welding area of ​​the ultrasonic pre-welding mark (12) is larger than the welding area of ​​the laser welding mark (31).

8. The battery structure according to any one of claims 1 to 7, characterized in that: The directly connected welding plate (30) has a welding area (32) and a non-welding area (33), and at least the outer contour line of the welding area (32) is adapted to the outer contour line of the ultrasonic pre-welding print (12); The projection of the ultrasonic pre-welding mark (12) in the thickness direction of the top plate structure (20) covers part of the welding area (32) and part of the non-welding area (33), and the laser welding mark (31) is located at the welding area (32).

9. The battery structure according to any one of claims 1 to 7, characterized in that: The height of the multi-layered tabs (11) with the ultrasonic pre-weld print (12) after cutting is H, wherein 16 mm ≤ H ≤ 24 mm.

10. An electrical device, characterized in that: The invention comprises a battery structure, wherein the battery structure is the battery structure according to any one of claims 1 to 9.

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