Battery flattening device

Abstract

Provided is a battery flattening device (1). The battery flattening device (1) comprises a base (11) and a flattening mechanism (12); the base (11) comprises a body (111) and two driving assemblies (112) spaced apart in a first direction (X); the flattening mechanism (12) comprises transmission assemblies (121) and flattening assemblies (122); the transmission assemblies (121) each are of a flexible structure; the transmission assemblies (121) which each are of a flexible structure are sleeved on the two driving assemblies (112), so that the transmission assemblies (121) are in an elliptical shape; the flattening assemblies (122) can be used for flattening tabs on the end surfaces of a battery; and the flattening assemblies (122) are connected to the driving assemblies (112) and move synchronously with the driving assemblies (112), so that the flattening assemblies (122) can operate along an elliptical trajectory, and thus the battery flattening device (1) can be used for flattening the end surfaces of the square battery.

Description

Battery flattening device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323144386.7, entitled “Battery Flattening Device,” filed on November 21, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery flattening device. Background Art

[0004] With the rise of the new energy industry, lithium batteries have also experienced rapid development. Currently, in order to achieve high discharge rates and cost-effectiveness while effectively controlling costs, lithium batteries are mostly manufactured using a full-tab process. In this process, the tabs must first be flattened and strengthened to a certain degree before subsequent welding can proceed.

[0005] The tab flattening devices in the prior art are mostly applied to cylindrical batteries, and lack a flattening device for the end faces of square batteries.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery flattening device that can flatten the end surface of a square battery.

[0008] The present application provides a battery flattening device, comprising: a base, comprising a main body and a driving assembly, wherein two driving assemblies are arranged on the main body at intervals along a first direction, and the driving assemblies are rotatably arranged relative to the main body; a flattening mechanism, comprising a transmission assembly and a flattening assembly, wherein the transmission assembly is a flexible structure, the transmission assembly is sleeved on the two driving assemblies, and is connected to the driving assemblies so that the driving assembly can drive the transmission assembly to rotate, the flattening assembly is connected to the transmission assembly, and moves synchronously with the transmission assembly, and the flattening assembly is used to flatten and shape the end face of the battery.

[0009] In the embodiment of the present application, the battery flattening device includes a base and a flattening mechanism, the base includes a main body and two drive components spaced apart along a first direction, the flattening mechanism includes a transmission component and a flattening component, the transmission component is a flexible structure, and the kneading transmission component is sleeved on the two drive components, so that the transmission component presents an elliptical shape, and the flattening component can be used to flatten the pole ears on the end face of the battery. The flattening component is connected to the drive component and moves synchronously with the drive component so that the flattening component can operate along an elliptical trajectory, so that the battery flattening device can be used to flatten the end face of the square battery.

[0010] In some embodiments, the transmission assembly includes a curved segment and a straight segment, the two curved segments are arranged opposite to each other along a first direction and are connected to the drive assembly, the straight segment is connected to the two curved segments, the two straight segments are arranged opposite to each other along a second direction, and the first direction and the second direction intersect.

[0011] In the technical solution of the embodiment of the present application, the transmission assembly includes a curved segment and a straight segment. The two curved segments are arranged opposite to each other along a first direction and are connected to the drive assembly. The two straight segments are connected between the two curved segments. The drive assembly drives the transmission assembly to operate through the curved segment so that the transmission assembly can operate in an elliptical trajectory.

[0012] In some embodiments, at least two spaced-apart kneading assemblies are connected to the transmission assembly.

[0013] In the technical solution of the embodiment of the present application, during the operation of the end surface flattening device, at least two flattening components act together on the end surface of the battery to improve the working efficiency of the end surface flattening device.

[0014] In some embodiments, the flattening assembly includes a connecting portion and a flattening portion, the connecting portion is connected to the transmission assembly, one end of the flattening portion is connected to the connecting portion, and the other end extends out of the center line of the transmission assembly extending along the first direction.

[0015] In the technical solution of the embodiment of the present application, the flattening assembly includes a connecting portion and a flattening portion that are interconnected. The flattening assembly is connected to the transmission assembly through the connecting portion, and one end of the flattening portion extends out of the center line of the transmission assembly extending along the first direction, so as to improve the problem that due to insufficient length of the flattening portion, part of the battery end surface cannot contact the flattening portion, so that part of the battery end surface cannot be flattened, thereby improving the reliability of the battery flattening device.

[0016] In some embodiments, the flattening portion is rotatably disposed relative to the connecting portion.

[0017] In the technical solution of the embodiment of the present application, the flattening part is rotatably arranged relative to the connecting part, which not only helps to provide a better end face flattening effect through the rotation of the flattening part, but also reduces the friction resistance between the flattening part and the end face, improves the flatness of the battery end face, and improves the reliability of the battery flattening device.

[0018] In some embodiments, a limiting block is provided on one end of the flattening portion connected to the connecting portion, and a side surface of the limiting block facing away from the connecting portion and a side surface of the flattening portion facing away from the main body form a limiting space, which is used to accommodate part of the battery.

[0019] In the technical solution of the embodiment of the present application, a limiting block is provided on one end of the flattening portion connected to the connecting portion, and a surface of the limiting block facing away from the connecting portion and a surface of the flattening portion facing away from the main body form a limiting space, and part of the battery is accommodated in the limiting space, so that when the battery tabs are flattened, the problem of the tabs being rubbed toward the outside of the battery, causing the tabs to be scattered, can be improved, thereby improving the reliability of the battery flattening device.

[0020] In some embodiments, an angle θ between a surface of the limiting block facing away from the connecting portion and a surface of the flattening portion facing away from the body satisfies 90°<θ<180°.

[0021] In the technical solution of the embodiment of the present application, the angle between the side surface of the limiting block away from the connecting part and the side surface of the flattening part away from the body is 90°<θ<180°, so as to reduce the difficulty of contact between the battery and the flattening part.

[0022] In some embodiments, the spacing between the two drive assemblies is adjustable.

[0023] In the technical solution of the embodiment of the present application, the distance between the two driving components is adjustable so that the battery flattening device can adapt to batteries of various specifications, thereby improving the practicality of the battery flattening device.

[0024] In some embodiments, the base also includes a suction mechanism, which includes a working part and a transmission part connected to each other, the transmission assembly is located on the first reference plane, the transmission part is arranged on the main body, and the port of the transmission part is arranged toward the first reference plane, and the working part is used to generate negative pressure so that the port of the transmission part generates suction.

[0025] In the technical solution of the embodiment of the present application, the base also includes a suction mechanism, which includes a working part and a transmission part that are interconnected. The transmission assembly is located on the first reference plane, and the port of the working part is set toward the first reference plane, so that impurities in the processing process can be sucked into the port of the working part and transported to other structures through the transmission part, so as to reduce the risk of impurities entering the battery, causing damage to the battery, and the risk of impurities entering the device and causing malfunction of the battery flattening device, thereby improving the reliability of the battery flattening device.

[0026] In some embodiments, the transmission portion extends toward the first reference plane and is tilted toward the transmission assembly so that the end of the transmission portion faces the transmission assembly.

[0027] In the technical solution of the embodiment of the present application, the working part extends toward the first reference plane and is tilted toward the transmission assembly, and the port of the working part faces the transmission assembly to improve the suction effect of the suction mechanism and improve the reliability of the battery flattening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0029] FIG1 is a schematic structural diagram of a square battery in the prior art;

[0030] FIG2 is a schematic structural diagram of another prior art square battery;

[0031] FIG3 is a schematic structural diagram of a battery flattening device provided in one embodiment of the present application;

[0032] FIG4 is a cross-sectional view of an embodiment of the present application at AA in FIG3 ;

[0033] FIG5 is a partial structural diagram of a transmission assembly of a battery flattening device provided in one embodiment of the present application.

[0034] The accompanying drawings in the specific implementation manner are as follows:

[0035] 1. Battery flattening device;

[0036] 11. Base; 111. Main body; 112. Drive assembly;

[0037] 12. Smoothing mechanism; 121. Transmission assembly; 122. Smoothing assembly; 1211. Curved section; 1212. Straight section; 1221. Connecting portion; 1222. Smoothing portion; 1223. Limiting block; 1213. Connecting bracket;

[0038] 13. Suction mechanism; 131. Working unit; 132. Transmission unit;

[0039] 2. Battery; 21. End face. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0041] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0043] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0047] Lithium-ion power batteries have the characteristics of high operating voltage, high specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, and no pollution. Therefore, they are used by many power equipment manufacturers.

[0048] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of lithium ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while at least a portion of the positive electrode tab is not coated with the positive active material layer. The positive current collector can be made of aluminum, and the positive active material layer includes a positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode tab protruding from the negative electrode current collecting portion, the negative electrode current collecting portion being coated with the negative electrode active material layer, and at least a portion of the negative electrode tab being uncoated with the negative electrode active material layer. The negative electrode current collector may be made of copper, and the negative electrode active material layer includes a negative electrode active material, which may be carbon or silicon, for example. To ensure that large currents can pass through without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The separator may be made of PP (polypropylene) or PE (polyethylene), for example.

[0049] Please refer to Figures 1 and 2. Figure 1 is a schematic structural diagram of a square battery in the prior art;

[0050] FIG2 is a schematic structural diagram of another square battery in the prior art.

[0051] As shown in Figures 1 and 2, after the positive electrode sheet, the negative electrode sheet and the separator are formed into a battery 2, the area on the positive electrode sheet that is not coated with the active material forms the tab end face 21 of the positive electrode, and the area on the negative electrode sheet that is not coated with the active material forms the tab end face 21 of the negative electrode. The tab end face 21 is usually located at one or both ends of the axial direction of the battery. The tab end face 21 needs to be welded to the current collecting plate so that the current of the battery can be output from the current collecting plate. Since the tab is soft and easy to deform, when the current collecting plate is welded, the pressure applied will cause the entire tab end face 21 to bend or deform, thereby causing the shape of the tab end face 21 to change, resulting in the battery 2 being unable to be installed in the battery casing or being connected to the battery casing and causing a short circuit. Therefore, in the full tab process of the lithium battery, the entire tab needs to be smoothed first and has a certain strength before subsequent welding can be performed.

[0052] The battery flattening devices in the prior art are all applied to cylindrical batteries. Due to the structural differences between cylindrical batteries and square batteries, the battery flattening devices in the prior art cannot be applied to square batteries.

[0053] Based on the above problems, the present application provides a battery flattening device, which includes a base and a flattening mechanism. The base includes a main body and two driving components spaced apart along a first direction. The flattening mechanism includes a transmission component and a flattening component. The transmission component is a flexible structure. The kneading transmission component is sleeved on the two driving components, so that the transmission component presents an elliptical shape. The flattening component can be used to flatten the tabs on the end face of the battery. The flattening component is connected to the driving component and moves synchronously with the driving component so that the flattening component can operate along an elliptical trajectory, so that the battery flattening device can be used to flatten the end face of the square battery.

[0054] Please refer to FIG3 , which is a schematic structural diagram of a battery flattening device provided in one embodiment of the present application.

[0055] As shown in Figure 3, the present application provides a battery flattening device 1, which includes a base 11 and a flattening mechanism 12. The base 11 includes a body 111 and a drive assembly 112. The two drive assemblies 112 are arranged on the body 111 at intervals along the first direction X, and the drive assembly 112 is rotatable relative to the body 111; the flattening mechanism 12 includes a transmission assembly 121 and a flattening assembly 122. The transmission assembly 121 is a flexible structure. The transmission assembly 121 is sleeved on the two drive assemblies 112 and connected to the drive assembly 112 so that the drive assembly 112 can drive the transmission assembly 121 to rotate. The flattening assembly 122 is connected to the transmission assembly 121 and moves synchronously with the transmission assembly 121. The flattening assembly 122 is used to flatten and shape the end face of the battery.

[0056] In the embodiment of the present application, the battery flattening device 1 includes a base 11 and a flattening mechanism 12. The base 11 includes a main body 111 and two drive components 112 spaced apart along the first direction X. The flattening mechanism 12 includes a transmission component 121 and a flattening component 122. The transmission component 121 is a flexible structure. The flexible transmission component 121 is sleeved on the two drive components 112 so that the transmission component 121 presents an elliptical shape. The flattening component 122 can be used to flatten the tabs on the end face of the battery. The flattening component 122 is connected to the drive component 112 and moves synchronously with the drive component 112 so that the flattening component 122 can operate along an elliptical trajectory, so that the battery flattening device 1 can be used to flatten the end face of a square battery.

[0057] The base 11 of the battery end surface flattening device includes a body 111 and two drive assemblies 112. The flattening mechanism 12 includes a transmission assembly 121 and a flattening assembly 122. The transmission assembly 121 is mounted on the drive assembly 112. For example, the transmission assembly 121 and the drive assembly 112 are respectively a conveyor belt and a drive wheel, or respectively a chain and a gear.

[0058] The transmission assembly 121 is a flexible structural member that is sleeved between two spaced-apart drive assemblies 112, giving the transmission assembly 121 an elliptical shape. Alternatively, multiple other drive assemblies 112 or support mechanisms may be provided on the body 111 to give the transmission assembly 121 another shape, allowing the end face flattening device to be applied to batteries of other unusual shapes. For example, the transmission assembly 121 sleeved between the drive assemblies 112 could form a diamond or triangle shape.

[0059] The surface of the flattening assembly 122 can contact and squeeze the end face of the battery. The battery end face here refers to the end face of the battery tab. Flattening the battery end face by the flattening assembly 122 means that the flattening assembly 122 flattens the battery tab. Flattening assembly 122 is connected to the transmission assembly 121 and moves synchronously with the transmission assembly 121. When the transmission assembly 121 is elliptical, the flattening assembly 122 moves along an elliptical trajectory, so that the flattening assembly 122 can flatten the end face of the square battery.

[0060] Optionally, the main body 111 and the drive assembly 112 are detachably connected so that when the size of the battery to be flattened changes, the size of the drive assembly 112 can be conveniently adjusted to change the running trajectory of the transmission assembly 121; or when the drive assembly 112 fails, it can be conveniently repaired and replaced.

[0061] Optionally, the transmission component 121 is a chain, which can be easily disassembled for maintenance or the length of the transmission component 121 can be changed, so that the end surface flattening device can adapt to batteries of various specifications.

[0062] In other embodiments, as shown in Figure 3, the transmission assembly 121 includes a curved segment 1211 and a straight segment 1212, the two curved segments 1211 are arranged opposite to each other along the first direction X and are connected to the driving assembly 112, the straight segment 1212 is connected to the two curved segments 1211, and the two straight segments 1212 are arranged opposite to each other along the second direction Y, and the first direction X and the second direction Y intersect.

[0063] In these embodiments, the transmission assembly 121 includes a curved segment 1211 and a straight segment 1212. The two curved segments 1211 are arranged opposite to each other along the first direction X and are connected to the driving assembly 112. The two straight segments 1212 are connected between the two curved segments 1211. The driving assembly 112 drives the transmission assembly 121 to operate through the curved segments 1211, so that the transmission assembly 121 can operate along an elliptical trajectory.

[0064] The two transmission components 121 have the same size specifications, so that the two curved sections 1211 and the two straight sections 1212 have the same size, so that the transmission component 121 is in a regular elliptical shape.

[0065] Optionally, a plurality of auxiliary wheels may be provided on the straight section 1212 or the curved section 1211 to ensure smooth operation of the transmission assembly 121 .

[0066] In some embodiments, as shown in FIG3 , the transmission assembly 121 is connected to at least two spaced apart smoothing assemblies 122 .

[0067] In these embodiments, during operation of the end surface smoothing device, at least two smoothing assemblies 122 act together on the battery end surface to improve the working efficiency of the end surface smoothing device. For example, the number of smoothing assemblies 122 provided on the transmission assembly 121 can be 3, 4, 5, etc.

[0068] Optionally, multiple flattening assemblies 122 are evenly spaced to help balance the force on the battery end surface and improve the flattening effect of the end surface flattening device.

[0069] Please refer to FIG. 4 , which is a cross-sectional view of an embodiment of the present application taken along line AA in FIG. 3 .

[0070] In some embodiments, as shown in Figures 3 and 4, the flattening component 122 includes a connecting portion 1221 and a flattening portion 1222, the connecting portion 1221 is connected to the transmission component 121, one end of the flattening portion 1222 is connected to the connecting portion 1221, and the other end extends out of the center line of the transmission component 121 extending along the first direction X.

[0071] In these embodiments, the flattening assembly 122 includes a connecting portion 1221 and a flattening portion 1222 that are interconnected. The flattening assembly 122 is connected to the transmission assembly 121 via the connecting portion 1221. One end of the flattening portion 1222 extends beyond the center line of the transmission assembly 121 extending along the first direction X, thereby improving the problem that part of the battery end surface cannot contact the flattening portion 1222 due to insufficient length of the flattening portion 1222, so that part of the battery end surface cannot be flattened, thereby improving the reliability of the battery flattening device 1.

[0072] For example, the dotted line BB in FIG. 4 may be the center line of the transmission assembly 121 extending along the first direction X.

[0073] Optionally, the connection between the connecting portion 1221 and the transmission assembly 121 is detachable, so as to facilitate replacement of the connecting portion 1221 when it fails, or to facilitate replacement of flattening assemblies 122 of different sizes when processing batteries of different specifications.

[0074] Exemplarily, the connecting portion 1221 and the transmission assembly 121 are directly connected to reduce the difficulty of preparing the transmission assembly 121 , for example, the connecting portion 1221 and the transmission assembly 121 are connected by bolts;

[0075] Alternatively, please refer to Figure 5, which is a schematic diagram of a portion of the transmission assembly of a battery flattening device according to one embodiment of the present application. A connecting bracket 1213 is provided on the transmission assembly 121. A connecting portion 1221 and the connecting bracket 1213 are detachably connected. The connection between the connecting portion 1221 and the connecting bracket 1213 can be bolted or snapped together. Optionally, multiple connecting brackets 1213 can be provided on the transmission assembly 121. Users can select different positions and numbers of connecting brackets 1213 to connect to the flattening assembly 122 according to actual needs.

[0076] "One end of the flattening portion 1222 is connected to the connecting portion 1221, and the other end extends out from the center line of the transmission assembly 121 extending along the first direction X" means that the flattening portion 1222 includes a fixed end and a free end, wherein the fixed end of the flattening portion 1222 is connected to the connecting portion 1221, and the free end thereof extends toward the side of the transmission assembly 121 close to the driving assembly 112. In order to reduce the area of ​​the battery end surface, especially the central part of the battery end surface, which cannot be contacted and flattened by the flattening portion 1222, the free end of the flattening portion 1222 should at least be staggered with the center line of the transmission assembly 121 extending along the first direction X. In this way, during the flattening process of the battery end surface, when the flattening assembly 122 is located in the straight section 1212, the contact area between the flattening portion 1222 and the battery end surface exceeds the center line of the battery end surface in the second direction Y, so that when the end surface flattening device is in operation, the entire end surface of the battery will be flattened.

[0077] Optionally, the flattening portion 1222 and the connecting portion 1221 are fixedly connected to improve the structural strength of the flattening assembly 122 .

[0078] Optionally, the flattening portion 1222 and the connecting portion 1221 are hinged, and the flattening portion 1222 is rotatable relative to the connecting portion 1221, so that the flattening assembly 122 can adapt to a variety of different batteries. The user can adjust the angle between the flattening portion 1222 and the connecting portion 1221 according to actual needs to obtain batteries with different end face shapes. Exemplarily, during the flattening of the battery end face, the axis of the battery is perpendicular to the surface in contact with the flattening portion 1222 and the battery end face, so that the battery end face is flattened into a plane; or during the flattening of the battery end face, the angle θ1 between the axis of the battery and the normal of the surface in contact with the flattening portion 1222 and the battery end face is 0<θ1<90°, so that the battery end face is flattened into a plane with a convex or concave center.

[0079] Optionally, the flattening portion 1222 is conical to reduce the frictional resistance between the flattening portion 1222 and the battery end surface, reducing the risk of the flattening portion 1222 damaging the tab, and the conical flattening portion 1222 has a lower weight and material cost. Optionally, the flattening portion 1222 is cylindrical, cubical, etc.

[0080] In some embodiments, as shown in FIG. 3 and FIG. 4 , the flattening portion 1222 is rotatable relative to the connecting portion 1221 .

[0081] In these embodiments, the flattening portion 1222 is rotatably arranged relative to the connecting portion 1221, which not only helps to provide a better end face flattening effect through the rotation of the flattening portion 1222, but also reduces the friction resistance between the flattening portion 1222 and the end face, thereby improving the flatness of the battery end face and improving the reliability of the battery flattening device 1.

[0082] Optionally, the flattening portion 1222 is cylindrical or conical, and rotates around its own axis relative to the connecting portion 1221. The rotation of the flattening portion 1222 reduces the module resistance between the flattening portion 1222 and the battery end face, which helps to reduce the scraping force of the flattening portion 1222 on the battery end face.

[0083] Exemplarily, the flattening portion 1222 and the connecting portion 1221 are connected by a rotating shaft, and the driving component is connected to the rotating shaft and drives the flattening portion 1222 to rotate through the rotating shaft. Exemplarily, the driving component is a motor, which is provided in the connecting portion 1221 or the transmission assembly 121 or the base.

[0084] In some embodiments, as shown in Figures 3 and 4, the flattening portion 1222 is connected to one end of the connecting portion 1221 and a limiting block 1223 is protruded therefrom. A side surface of the limiting block 1223 facing away from the connecting portion 1221 and a side surface of the flattening portion 1222 facing away from the main body 111 form a limiting space, which is used to accommodate part of the battery.

[0085] In these embodiments, the flattening portion 1222 is connected to one end of the connecting portion 1221 and a limiting block 1223 is protruded therefrom. A side surface of the limiting block 1223 facing away from the connecting portion 1221 and a side surface of the flattening portion 1222 facing away from the main body 111 form a limiting space. Part of the battery is accommodated in the limiting space, so that when the battery tabs are flattened, the problem of the tabs being rubbed toward the outside of the battery, causing the tabs to be scattered, can be improved, thereby improving the reliability of the battery flattening device 1.

[0086] When flattening the battery end face, the flattening portion 1222 may cause the tab to tilt toward the outside of the battery when rolling on the tab, causing the tab to be scattered. Therefore, the battery flattening device 1 of the present embodiment is provided with a limit block 1223. The limit block 1223 prevents the tab from being scattered outside the battery, thereby confining the tab within the limited space and improving the flattening quality of the battery end face.

[0087] The flattening portion 1222 is connected to one end of the connecting portion 1221 and a limiting block 1223 is protruded therefrom. The side of the limiting block 1223 facing away from the connecting portion 1221 and the end surface facing away from the main body 111, and the side surface of the flattening portion 1222 facing away from the main body 111 can be used to contact the end face of the battery and form a limiting space.

[0088] Optionally, the limit block 1223 and the flattening portion 1222 are integrally formed, or the limit block 1223 is riveted or welded to the flattening portion 1222 , and the limit block 1223 protrudes from the surface of the flattening portion 1222 to improve the structural strength of the flattening portion 1222 .

[0089] Optionally, the stopper 1223 and the flattening portion 1222 are separately formed to facilitate adjusting the size of the stopper 1223 according to different battery end surface conditions. For example, the stopper 1223 is connected between the flattening portion 1222 and the connecting portion 1221, and a portion of the stopper 1223 extends beyond the flattening portion 1222, or the stopper 1223 and the flattening portion 1222 are bolted or snap-fitted together.

[0090] In some embodiments, as shown in FIG. 4 , an angle θ between a surface of the limiting block 1223 facing away from the connecting portion 1221 and a surface of the flattening portion 1222 facing away from the body 111 satisfies 90°<θ<180°.

[0091] In these embodiments, the angle between the side surface of the limiting block 1223 away from the connecting portion 1221 and the side surface of the flattened portion 1222 away from the body 111 is 90°<θ<180°, so as to reduce the difficulty of contact between the battery and the flattened portion 1222.

[0092] Illustratively, the angle θ between the side surface of the limiting block 1223 away from the connecting portion 1221 and the side surface of the flattening portion 1222 away from the body 111 is 120°, 130°, 135°, etc.

[0093] In some embodiments, as shown in FIG. 3 , the distance between the two driving assemblies 112 is adjustable.

[0094] In these embodiments, the distance between the two driving assemblies 112 is adjustable, so that the battery flattening device 1 can adapt to batteries of various specifications, thereby improving the practicality of the battery flattening device 1.

[0095] By adjusting the distance between the two drive assemblies 112, the elliptical trajectory of the transmission assembly 121 can be adjusted, so that the battery flattening device 1 can be adapted to batteries of various specifications. In addition, when adjusting the distance between the two drive assemblies 112, the length of the transmission assembly 121 can be adjusted synchronously.

[0096] Optionally, a plurality of drive assemblies 112 are provided on the main body 111 along the first direction X, and the user can, as needed, sleeve the drive assembly 112 on any two drive assemblies 112 to adjust the distance between the two drive assemblies 112 connected to the transmission assembly 121; or a slide rail extending along the first direction X is provided on the main body 111, and the drive assembly 112 is movably provided on the slide rail along the first direction X to adjust the distance between the two drive assemblies 112; or a plurality of mounting holes arranged along the first direction X are provided on the main body 111, and the user can, as needed, install the drive assembly 112 in any two mounting holes to adjust the distance between the two drive assemblies 112.

[0097] In some embodiments, as shown in Figures 3 and 4, the base 11 also includes a suction mechanism 13, the suction mechanism 13 includes a working part 131 and a transmission part 132 connected to each other, the transmission assembly 121 is located on the first reference plane, the transmission part 132 is arranged on the main body 111, and the port of the transmission part 132 is arranged toward the first reference plane. The working part 131 is used to generate negative pressure so that the port of the transmission part 132 generates suction.

[0098] In these embodiments, the base 11 also includes a suction mechanism 13, which includes a working part 131 and a transmission part 132 that are interconnected. The transmission assembly 121 is located on the first reference plane, and the port of the working part 131 is set toward the first reference plane, so that impurities in the processing process can be sucked into the port of the working part 131 and transported to other structures through the transmission part 132, so as to reduce the risk of impurities entering the interior of the battery, causing damage to the battery, and the risk of impurities entering the interior of the device causing malfunction of the battery flattening device 1, thereby improving the reliability of the battery flattening device 1.

[0099] The suction mechanism 13 includes a working part 131 and a transmission part 132. The working part 131 can be an exhaust fan. The working part 131 and the transmission part 132 are connected. The port of the transmission part 132 faces the first reference surface. The exhaust fan is used to generate negative pressure so that the air near the port of the transmission part 132 can be sucked into the transmission part 132, so that the metal debris and other impurities generated by the end face of the battery can be sucked into the transmission part 132, so as to reduce the risk of these metal debris damaging the battery and / or the battery flattening device 1.

[0100] Optionally, a plurality of suction mechanisms 13 are provided on the body 111 to improve the suction effect of the suction mechanism 13. Exemplarily, the plurality of suction mechanisms 13 are arranged along the first direction X.

[0101] Optionally, the suction mechanism 13 is a vacuum tube.

[0102] In some embodiments, as shown in FIG. 3 and FIG. 4 , the transmission portion 132 extends toward the first reference plane and is tilted toward the transmission assembly 121 , so that the end of the transmission portion 132 faces the transmission assembly 121 .

[0103] In these embodiments, the working portion 131 extends toward the first reference plane and is tilted toward the transmission assembly 121 , and the end of the working portion 131 faces the transmission assembly 121 to improve the suction effect of the suction mechanism 13 and improve the reliability of the battery flattening device 1 .

[0104] Optionally, the transmission portion 132 may be made of insulating materials such as rubber, plastic, or silicone.

[0105] Optionally, the transmission portion 132 includes two ports arranged opposite to each other, and the two ports are respectively arranged toward the straight segments 1212 on both sides, so that one transmission portion 132 can suck the flattened sections of the straight segments 1212 on both sides, making full use of the device space to enhance the suction efficiency of the suction mechanism 13.

[0106] In some embodiments, as shown in Figures 3 to 5, the battery flattening device 1 includes a base 11, a flattening mechanism 12, and a suction mechanism 13. The base 11 includes a body 111 and a drive assembly 112. The two drive assemblies 112 are spaced apart on the body 111 along a first direction X, and the distance between the two drive assemblies 112 is adjustable. The drive assembly 112 is rotatable relative to the body 111.

[0107] The smoothing mechanism 12 includes a transmission assembly 121 and a smoothing assembly 122. The transmission assembly 121 is a flexible structure. The transmission assembly 121 is sleeved on the two drive assemblies 112 and connected to the drive assemblies 112 so that the drive assemblies 112 can drive the transmission assembly 121 to rotate. The transmission assembly 121 includes a curved segment 1211 and a straight segment 1212. The two curved segments 1211 are arranged opposite to each other along a first direction X and are connected to the drive assemblies 112. The straight segment 1212 is connected to the two curved segments 1211. The two straight segments 1212 are arranged opposite to each other along a second direction Y.

[0108] The flattening assembly 122 is connected to the transmission assembly 121 and moves synchronously with the transmission assembly 121. The flattening assembly 122 is used to flatten and shape the end surface of the battery. The transmission assembly 121 is provided with at least two flattening assemblies 122 arranged at equal intervals. The flattening assembly 122 includes a connecting portion 1221 and a flattening portion 1222. The connecting portion 1221 is connected to the transmission assembly 121. One end of the flattening portion 1222 is connected to the connecting portion 1221, and the other end extends out of the center line of the transmission assembly 121 extending along the first direction X. The flattening portion 1222 is rotatably arranged relative to the connecting portion 1221. A limiting block 1223 is protruded from one end of the flattening portion 1222 connected to the connecting portion 1221. A surface of the limiting block 1223 facing away from the connecting portion 1221 and a surface of the flattening portion 1222 facing away from the body 111 form a limiting space. The angle θ between the surface of the limiting block 1223 facing away from the connecting portion 1221 and the surface of the flattening portion 1222 facing away from the body 111 satisfies θ>90°. The limiting space is used to accommodate part of the battery.

[0109] The suction mechanism 13 includes a working part 131 and a transmission part 132 that are interconnected. The transmission component 121 is located on the first reference plane. The transmission part 132 is arranged on the main body 111. The transmission part 132 extends toward the first reference plane and is inclined toward the transmission component 121 so that the port of the transmission part 132 faces the transmission component 121. The working part 131 is used to generate negative pressure so that the port of the transmission part 132 generates suction.

[0110] In the embodiment of the present application, the battery flattening device 1 includes a base 11 and a flattening mechanism 12. The base 11 includes a main body 111 and two drive components 112 spaced apart along the first direction X. The flattening mechanism 12 includes a transmission component 121 and a flattening component 122. The transmission component 121 is a flexible structure. The flexible transmission component 121 is sleeved on the two drive components 112 so that the transmission component 121 presents an elliptical shape. The flattening component 122 can be used to flatten the tabs on the end face of the battery. The flattening component 122 is connected to the drive component 112 and moves synchronously with the drive component 112 so that the flattening component 122 can operate along an elliptical trajectory, so that the battery flattening device 1 can be used to flatten the end face of a square battery.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery flattening device, comprising: The base comprises a body and a driving assembly, wherein two driving assemblies are arranged on the body at intervals along a first direction, and the driving assemblies are rotatably arranged relative to the body; The flattening mechanism includes a transmission component and a flattening component. The transmission component is a flexible structure. The transmission component is sleeved on the two drive components and connected to the drive components so that the drive components can drive the transmission components to rotate. The flattening component is connected to the transmission component and moves synchronously with the transmission component. The flattening component is used to flatten and shape the end face of the battery.

2. The battery flattening device according to claim 1, wherein: The transmission assembly includes a curved segment and a straight segment, the two curved segments are arranged opposite to each other along the first direction and connected to the driving assembly, the straight segment is connected to the two curved segments, the two straight segments are arranged opposite to each other along the second direction, and the first direction and the second direction intersect.

3. The battery flattening device according to any one of claims 1 or 2, wherein: At least two spaced apart kneading assemblies are connected to the transmission assembly.

4. The battery flattening device according to any one of claims 1 to 3, wherein: The flattening component includes a connecting portion and a flattening portion, wherein the connecting portion is connected to the transmission component, one end of the flattening portion is connected to the connecting portion, and the other end extends out of a center line of the transmission component extending along the first direction.

5. The battery flattening device according to claim 4, wherein: The flattening portion is rotatably arranged relative to the connecting portion.

6. The battery flattening device according to claim 4, wherein: The flattened portion is connected to one end of the connecting portion and a limiting block is protruded therefrom. A side surface of the limiting block away from the connecting portion and a side surface of the flattened portion away from the body form a limiting space for accommodating part of the battery.

7. The battery flattening device according to claim 6, wherein: An angle θ between a side surface of the limiting block away from the connecting portion and a side surface of the flattening portion away from the main body satisfies 90°<θ<180°.

8. The battery flattening device according to any one of claims 1 to 7, wherein: The spacing between the two drive assemblies is adjustable.

9. The battery flattening device according to any one of claims 1 to 8, wherein: The base also includes a suction mechanism, which includes a working part and a transmission part that are connected to each other. The transmission assembly is located on a first reference plane, the transmission part is arranged on the main body, and the port of the transmission part is arranged toward the first reference plane. The working part is used to generate negative pressure so that the port of the transmission part generates suction.

10. The battery flattening device according to claim 9, wherein: The transmission portion extends toward the first reference surface and is tilted toward the transmission assembly so that a port of the transmission portion faces the transmission assembly.

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