Collector plate manufacturing method, collector plate and battery monomer
By setting areas on the material sheet and extruding protrusions of varying thicknesses, the problems of low production efficiency and high cost of existing manifolds are solved, achieving efficient and low-cost manufacturing of manifolds with varying thicknesses.
Patent Information
- Application Number
- CN202511122016.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-11-18
AI Technical Summary
Existing manifold production methods are inefficient and costly, mainly because they require stamping sheets of different thicknesses and then welding them.
By setting first and second regions on a single sheet of material and pressing the first region toward the center of the first region to form protrusions of different thicknesses, the process of stamping and welding sheets of different thicknesses is eliminated.
It improves production efficiency, reduces production costs, and enables the formation of complex, unevenly thick manifolds on the material sheet, thereby improving concentricity and dimensional accuracy.
Smart Images
Figure CN120978081A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery, in particular to a current collector manufacturing method, a current collector and a battery cell. BACKGROUND
[0002] In the assembly of cylindrical lithium ion battery, the current collector is usually used to connect the tab and the battery cap. One end of the current collector is welded with the battery tab, and the other end of the current collector is connected with the battery cap by welding or riveting, so that the cylindrical lithium ion battery is sealed and the current loop is formed.
[0003] In the prior art, the thickness of different regions of the current collector is different. The current common production method of the current collector is to stamp different thickness of the sheet first, and then weld the sheets of different thickness, thereby manufacturing the unequal thickness current collector. This production method is low in efficiency and high in production cost.
[0004] Therefore, it is urgent to provide a current collector manufacturing method, a current collector and a battery cell to solve the above technical problems. SUMMARY
[0005] The first object of the present application is to provide a current collector manufacturing method, which manufactures an unequal thickness current collector from a whole sheet, saves the process of stamping sheets of different thickness and welding sheets of different thickness, and not only improves the production efficiency, but also reduces the production cost.
[0006] To achieve this object, the present application adopts the following technical solutions:
[0007] The current collector manufacturing method comprises the following steps:
[0008] S10, providing a sheet with a thickness of a, and setting a first region and a second region on the sheet;
[0009] S20, extruding the first region in the direction towards the center of the first region to form a first protruding part in the first region, and making the thickness of the first protruding part reach b, wherein b>a.
[0010] Optionally, the step S10 further comprises: the provided sheet is circular, and the center of the sheet is taken as a reference point; the set first region is circular, and the set second region is annular around the first region, and the reference point is taken as the center of the first region and the center point of the second region.
[0011] Optionally, the current collector manufacturing method further comprises the following steps:
[0012] S31, setting a stamping area in the second region;
[0013] S32, stamping the stamping area.
[0014] Optionally, the step S31 further comprises: setting the first stamping area, the second stamping area and the non-stamping area in the second region.
[0015] The step S32 further comprises: stamping the first stamping area to form the second protruding part in the first stamping area, and stamping the second stamping area to form the third protruding part in the second stamping area.
[0016] Optionally, the step S31 further comprises: the set first stamping area is annular and arranged around the first region, and the set second stamping area and the non-stamping area are located on a side of the first stamping area away from the first region, and the second stamping area and the non-stamping area are distributed along the circumference of the first region.
[0017] Optionally, in the step S32, the first stamping area is stamped first, and then the second stamping area is stamped.
[0018] Optionally, the step S20 further comprises: performing a thinning treatment on the second region to make the thickness of the second region reach c, wherein c < a.
[0019] Optionally, in the step S20, the first region is extruded first, and then the thinning treatment is performed on the second region.
[0020] The second object of the present application is to provide a current collecting plate with high production efficiency and low production cost.
[0021] To achieve the object, the present application adopts the following technical scheme:
[0022] The current collecting plate is made by the current collecting plate manufacturing method.
[0023] The third object of the present application is to provide a battery monomer with high production efficiency and low production cost.
[0024] To achieve the object, the present application adopts the following technical scheme:
[0025] The battery monomer comprises a shell, a pole group, a cover plate assembly and the current collecting plate, the pole group and the current collecting plate are arranged in the shell, the cover plate assembly is arranged at the opening of the shell, and the cover plate assembly is electrically connected with the pole group through the current collecting plate.
[0026] The present application has the following beneficial effects:
[0027] The collecting plate manufacturing method provided by the present application sets a first area and a second area on a sheet with a thickness of a, then extrudes the first area in a direction towards the center of the first area to form a first protruding part in the first area and increase the thickness of the first protruding part to b, thereby achieving the effect that the first protruding part has a different thickness from the second area. The collecting plate manufacturing method makes a whole sheet into a collecting plate with different thicknesses, eliminates the processes of punching sheets with different thicknesses and welding sheets with different thicknesses, can not only improve the production efficiency, but also reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 is the first flow chart of the collecting plate manufacturing method provided by the present application;
[0029] Figure 2 is the cross-sectional structure schematic diagram of the sheet provided by the present application;
[0030] Figure 3 is the structure schematic diagram of the sheet provided by the present application;
[0031] Figure 4 is the structure schematic diagram of the collecting plate provided by the present application;
[0032] Figure 5 is the cross-sectional structure schematic diagram of the collecting plate provided by the present application;
[0033] Figure 6 is the second flow chart of the collecting plate manufacturing method provided by the present application;
[0034] Figure 7 is the first matching structure (before extruding the first area) schematic diagram of the sheet with the first die and the second die provided by the present application;
[0035] Figure 8 is the second matching structure (after extruding the first area) schematic diagram of the sheet with the first die and the second die provided by the present application.
[0036] In the drawings:
[0037] 100, sheet; 110, first area; 120, second area; 121, first punching area; 122, second punching area; 123, non-punching area; 130, reference point; 210, first protruding part; 211, groove; 220, second protruding part; 230, third protruding part; 310, first die; 311, boss; 320, second die. DETAILED DESCRIPTION
[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0042] This embodiment provides a method for manufacturing a manifold, which produces a manifold of unequal thickness from a single sheet of material, eliminating the need for stamping and welding sheets of different thicknesses separately. This not only improves production efficiency but also reduces production costs.
[0043] Specifically, such as Figures 1 to 5 As shown, the method for manufacturing this manifold includes the following steps:
[0044] S10. Provide a sheet 100 with a thickness of a, and define a first region 110 and a second region 120 on the sheet 100;
[0045] S20, extruding the first area 110 in a direction towards the center of the first area 110 to form the first protrusion 210 in the first area 110 and to make the thickness of the first protrusion 210 reach b, where b>a.
[0046] The current collecting plate manufacturing method sets the first area 110 and the second area 120 on the sheet 100 with a thickness of a, and then extrudes the first area 110 in a direction towards the center of the first area 110 to form the first protrusion 210 in the first area 110 and to make the thickness of the first protrusion 210 increase to b, thereby achieving the effect that the first protrusion 210 has a different thickness from the second area 120. The current collecting plate manufacturing method makes an entire sheet 100 into a current collecting plate with different thicknesses, which eliminates the processes of punching different thickness sheets 100 and welding different thickness sheets 100, and not only improves the production efficiency, but also reduces the production cost.
[0047] Optionally, as shown in Figures 1 to 6 the sheet 100 is circular, and the center of the circle of the sheet 100 is the reference point 130; the first area 110 is circular, and the second area 120 is annular and arranged around the first area 110, and the reference point 130 is the center of the first area 110 and the center point of the second area 120, and then the first area 110 is extruded in a direction towards the reference point 130 to form the first protrusion 210, and the center of the first protrusion 210 is the reference point 130. In this way, the concentricity of the first protrusion 210 and the second area 120 can be improved, and the concentricity of different areas of the current collecting plate is improved on the basis of meeting the current collecting plate with different thicknesses.
[0048] Optionally, the current collecting plate manufacturing method further comprises the following steps: S31, setting a punching area in the second area 120; and S32, punching the punching area. In this way, a pre-set protrusion can be formed in the second area 120 to meet the connection requirements of the current collecting plate and the tab.
[0049] Further, the step S31 further comprises: setting a first punching area 121, a second punching area 122, and a non-punching area 123 in the second area 120.
[0050] The step S32 further comprises: punching the first punching area 121 to form the second protrusion 220 in the first punching area 121, and punching the second punching area 122 to form the third protrusion 230 in the second punching area 122.
[0051] By setting the first stamping area 121, the second stamping area 122 and the non-stamping area 123 in the second area 120, then stamping the first stamping area 121 and the second stamping area 122 respectively, and not processing the non-stamping area 123, the second protruding part 220 and the third protruding part 230 can be formed at different positions in the second area 120, and the method can make the shapes and / or sizes of the second protruding part 220 and the third protruding part 230 different. It can be seen that the manufacturing method realizes the whole piece 100 into a current collector with a more complex structure, specifically, the manufacturing method can form the first protruding part 210, the second protruding part 220 and the third protruding part 230 at different positions of the whole piece 100, and also can make the shapes, sizes and directions of the first protruding part 210, the second protruding part 220 and the third protruding part 230 same or different according to production needs.
[0052] In the embodiment, the first protruding part 210 and the second protruding part 220 are annular, and the third protruding part 230 is roughly triangular, of course, in other embodiments, the first protruding part 210, the second protruding part 220 and the third protruding part 230 can also be circular, rectangular or other shapes. In the embodiment, the directions of the first protruding part 210 and the third protruding part 230 are same, and the direction of the second protruding part 220 is opposite to that of the first protruding part 210. Of course, in other embodiments, the directions of the first protruding part 210, the second protruding part 220 and the third protruding part 230 can also be other forms, which are not listed one by one here.
[0053] Further, the step S31 further includes that the set first stamping area 121 is annular around the first area 110, the set second stamping area 122 and the non-stamping area 123 are located on the side of the first stamping area 121 away from the first area 110, and the second stamping area 122 and the non-stamping area 123 are distributed along the circumference of the first area 110.
[0054] The method makes the annular first stamping area 121 take the reference point 130 as the center point, and the second stamping area 122 and the non-stamping area 123 are distributed around the reference point 130, which can improve the concentricity of the first protruding part 210, the second protruding part 220, the third protruding part 230 and the non-stamping area 123.
[0055] Further, the number of the second stamping areas 122 and the non-stamping areas 123 is at least two, and the second stamping areas 122 and the non-stamping areas 123 are alternately distributed around the reference point 130, so as to form a structure that the at least two third protruding portions 230 and the at least two non-stamping areas 123 are alternately distributed along the circumference of the first protruding portion 210. By setting the number and distribution of the second stamping areas 122 and the non-stamping areas 123, a current collector with more complex structure can be manufactured. In the embodiment, the number of the second stamping areas 122 and the non-stamping areas 123 is three. Of course, in other embodiments, the number of the second stamping areas 122 and the non-stamping areas 123 can be one, two, four or more, and the number of the second stamping areas 122 and the non-stamping areas 123 can be the same or different.
[0056] Optionally, in step S32, the first stamping area 121 is stamped first, and then the second stamping area 122 is stamped. Compared with stamping the second stamping area 122 first and then stamping the first stamping area 121, the stamping sequence provided in the embodiment can avoid affecting the shape and size of the third protruding portion 230 when the first stamping area 121 is stamped later, which is beneficial to improving the shape accuracy and size accuracy of the third protruding portion 230.
[0057] Optionally, in step S32, the second stamping area 122 is stamped twice, so that the profile of the third protruding portion 230 is clearer.
[0058] Optionally, step S20 further includes: performing thinning processing on the second area 120, so that the thickness of the second area 120 reaches c, where c
[0059] Further, in step S20, the second area 120 is thinned by using a cold rolling process. The cold rolling process is a relatively mature production process in the field, which is simple to operate and has high forming accuracy, and is beneficial to reducing the production difficulty and improving the size accuracy of the current collector. Of course, in other embodiments, the second area 120 can also be thinned by using a hot rolling process or grinding.
[0060] Optionally, the method further comprises a step S33 of thinning the third protruding part 230 by cold rolling or cutting, so that the thickness of the third protruding part 230 is d, and d is less than c, so that the thickness of the third protruding part 230 is less than the thickness of the second protruding part 220 and the thickness of the non-stamping area 123, facilitating the welding of the third protruding part 230 and the tab of the pole group.
[0061] It should be noted that the specific values of a, b, c and d can be determined according to actual production requirements. For example, a can be 0.5 mm, 0.6 mm or 0.7 mm, b can be 0.8 mm, 0.9 mm or 1 mm, c can be 0.4 mm, 0.3 mm or 0.2 mm, and d can be 0.3 mm, 0.2 mm or 0.1 mm. In this embodiment, a is 0.6 mm, b is 0.8 mm, c is 0.4 mm, and d is 0.2 mm.
[0062] Optionally, in step S20, the first area 110 is extruded first, and then the second area 120 is thinned. Compared with thinning the second area 120 first and then extruding the first area 110, the method provided in this embodiment can avoid affecting the second area 120 during the subsequent extrusion, which is beneficial to improving the dimensional accuracy of the second area 120.
[0063] Optionally, as shown in FIG. 6, the method further comprises a step S40 of forming a plurality of second protruding parts 220 on the second area 120. Figure 5 、 Figure 7 and Figure 8As shown, between step S10 and step S20, there is also step S11: providing the first mold 310 and the second mold 320, the first mold 310 is provided with the boss 311, moving the material sheet 100 between the first mold 310 and the second mold 320, making the boss 311 fit the center of the first area 110, making the second mold 320 face the center of the first area 110, and making the second mold 320 be spaced apart from the material sheet 100; step S20 further includes: when extruding the first area 110, moving the first mold 310 in the direction towards the second mold 320, and stopping extruding when the second mold 320 fits the material sheet 100. Thus, the first protruding part 210 is formed, and the groove 211 is formed on the side of the first protruding part 210 facing the first mold 310. This method uses the first mold 310 and the second mold 320 that cooperate with each other, and cooperates with the method of extruding the first area 110, so that the thickness of the first protruding part 210 is increased, and the shaping of the first protruding part 210 is also completed, that is, the side of the first protruding part 210 facing the second mold 320 is protruded, and the groove 211 is formed on the side of the first protruding part 210 facing the first mold 310, thereby eliminating the additional shaping process (such as stamping or cutting, etc.) of the first protruding part 210, reducing the production process, reducing the production difficulty, and improving the production efficiency. In addition, before starting to extrude the first area 110, the material sheet 100 is spaced apart from the second mold 320, and the extrusion is stopped when the material sheet 100 fits the second mold 320, so that the control of the thickness of the first protruding part 210 is realized, so that the thickness of the first protruding part 210 reaches the preset b value, and the method can also improve the dimensional accuracy of the first protruding part 210, so that the dimensional accuracy of the first protruding part 210 reaches ±0.05mm.
[0064] It should be noted that in actual production, the size of b value can be changed by changing the distance between the first mold 310 and the second mold 320, the size of a value, or the diameter of the circular first area 110.
[0065] Figure 7 The arrow direction is the extrusion direction, and it should be noted that, Figure 7 The figure is a cross-sectional structure diagram, and in actual extrusion, all positions of the first area 110 in the circumferential direction need to be extruded in the direction towards the reference point 130.
[0066] Optionally, in step S10, the material sheet 100 made of aluminum or other materials is selected to facilitate the extrusion forming of the first protruding part 210. In step S10, the aluminum roll is cut into a circular material sheet 100 to further reduce the production cost.
[0067] Further, in step S10, the aluminum sheet is cut three times with the same radius with the reference point 130 as the center to form a circular sheet 100, thereby improving the dimensional accuracy and shape tolerance of the circular sheet 100.
[0068] Optionally, the current collecting plate manufacturing method further comprises step S40: stamping the first area 110 and the second area 120 by using a third die and a fourth die, wherein the third die is provided with a first protruding part matched with the first protruding part 210, a first recessed area matched with the second protruding part 220, and a second protruding part matched with the third protruding part 230, and the fourth die is provided with a second recessed area matched with the first protruding part 210, a third protruding part matched with the second protruding part 220, and a third recessed area matched with the third protruding part 230. When stamping, the sheet 100 is moved between the third die and the fourth die, the first protruding part and the second recessed area are matched with the first protruding part 210, the first recessed area and the third protruding part are matched with the second protruding part 220, and the second protruding part and the third recessed area are matched with the third protruding part 230, and then one of the third die and the fourth die is moved to the other to realize secondary shaping of the first protruding part 210, the second protruding part 220, and the third protruding part 230, thereby improving the shape accuracy of the first protruding part 210, the second protruding part 220, and the third protruding part 230, and facilitating improvement of the product yield of the current collecting plate.
[0069] Optionally, the current collecting plate manufacturing method further comprises step S50: performing deburring treatment on the sheet 100 as a whole, thereby further improving the product yield of the current collecting plate.
[0070] Optionally, in step S10, the circular sheet 100 with a radius of r1 is provided; and the current collecting plate manufacturing method further comprises step S60: cutting the sheet 100 with the reference point 130 as the center and r2 as the radius to form the current collecting plate, wherein r2 < r1, and r2 is greater than the distance between the reference point 130 and the third protruding part 230. The method can improve the dimensional accuracy of the current collecting plate, and the radius size and the controllability of the dimensional accuracy of the current collecting plate are higher.
[0071] Further, in step S60, the sheet 100 is cut twice along the circumferential direction to improve the cutting accuracy, thereby further improving the dimensional accuracy of the current collecting plate.
[0072] The current collecting plate manufacturing method provided in the embodiment can be used to manufacture current collecting plates with different thicknesses by extrusion and thinning, the different areas of the current collecting plate can form protruding parts and flat parts (i.e., non-stamping areas 123) with different shapes, different thicknesses, and different sizes, and the protruding parts and the flat parts can have high concentricity, and the concentricity of the protruding parts and the flat parts can be less than 0.1 mm.
[0073] The embodiment also provides a current collecting plate made by the current collecting plate manufacturing method, so that the current collecting plate is manufactured without stamping the pieces 100 with different thicknesses respectively and without welding the pieces 100 with different thicknesses, thereby reducing the production cost of the current collecting plate and improving the production efficiency of the current collecting plate.
[0074] The embodiment also provides a battery monomer including a shell, a pole group, a cover plate assembly and the current collecting plate, the pole group and the current collecting plate are arranged in the shell, the cover plate assembly is arranged at the opening of the shell, and the cover plate assembly is electrically connected with the pole group through the current collecting plate. The battery monomer adopts the current collecting plate, has high production efficiency and low production cost.
[0075] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation manners of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.
Claims
1. A method for manufacturing a manifold, characterized in that, Includes the following steps: S10. Provide a sheet (100) with a thickness of a, and define a first region (110) and a second region (120) on the sheet (100); S20. Press the first region (110) along the direction toward the center of the first region (110) to form a first protrusion (210) in the first region (110) and make the thickness of the first protrusion (210) reach b, where b > a.
2. The method for manufacturing a manifold according to claim 1, characterized in that, Step S10 further includes: the provided sheet (100) is circular, and the center of the sheet (100) is used as a reference point (130); the first region (110) is circular, and the second region (120) is an annulus surrounding the first region (110), and the reference point (130) is used as the center of the first region (110) and the center point of the second region (120).
3. The method for manufacturing a manifold according to claim 2, characterized in that, The method for manufacturing the manifold also includes the following steps: S31. A stamping zone is set in the second region (120); S32. Stamp the stamping area.
4. The method for manufacturing a manifold according to claim 3, characterized in that, Step S31 further includes: setting a first stamping area (121), a second stamping area (122), and a non-stamping area (123) in the second region (120); Step S32 further includes: stamping the first stamping area (121) to form a second protrusion (220) in the first stamping area (121), stamping the second stamping area (122) to form a third protrusion (230) in the second stamping area (122).
5. The method for manufacturing a manifold according to claim 4, characterized in that, Step S31 further includes: the first stamping area (121) is a ring surrounding the first region (110), the second stamping area (122) and the non-stamping area (123) are both located on the side of the first stamping area (121) away from the first region (110), and the second stamping area (122) and the non-stamping area (123) are distributed circumferentially along the first region (110).
6. The method for manufacturing a manifold according to claim 5, characterized in that, In step S32, the first stamping area (121) is stamped first, and then the second stamping area (122) is stamped.
7. The method for manufacturing a manifold according to any one of claims 1-6, characterized in that, Step S20 further includes: thinning the second region (120) to achieve a thickness of c, where c < a.
8. The method for manufacturing a manifold according to claim 7, characterized in that, In step S20, the first region (110) is first squeezed, and then the second region (120) is subjected to the thinning process.
9. A collector disk, characterized in that, The collector plate is manufactured using the collector plate manufacturing method as described in any one of claims 1-8.
10. A single battery cell, characterized in that, The device includes a housing, an electrode assembly, a cover plate assembly, and a current collector as described in claim 9. The electrode assembly and the current collector are both disposed within the housing. The cover plate assembly covers the opening of the housing and is electrically connected to the electrode assembly through the current collector.