Cylindrical battery and its easy folding current collector

Abstract

The application discloses a cylindrical battery and a foldable current collector thereof, and relates to the technical field of batteries. The foldable current collector comprises a disc part, a first flat plate part and a second flat plate part which are sequentially connected in a first direction. The current collector has a first surface and a second surface which are opposite to each other. A first bending part is arranged between the disc part and the first flat plate part, and the first bending part comprises two first grooves which extend in a second direction and are spaced apart on the first surface in the first direction. The second direction is perpendicular to the first direction. A second bending part is arranged between the first flat plate part and the second flat plate part, and the second bending part comprises two second grooves which extend in the second direction and are spaced apart on the second surface in the first direction. The cylindrical battery and the foldable current collector thereof can effectively reduce the assembly space of the folded current collector and will not cause extrusion to other components.

Description

Technical Field

[0001] This specification relates to the field of battery technology, and in particular to a cylindrical battery and its foldable current collector. Background Technology

[0002] With the widespread application of lithium-ion batteries in high-power devices, the industry has placed higher demands on the high-rate charge-discharge performance of battery cells. This demand for high-rate charge-discharge has spurred the development of all-tab cylindrical batteries. In the development and application of all-tab batteries, a tab-shaped current collector design is commonly used between the positive current collector and the positive terminal. To reduce internal resistance and improve overcurrent capacity, the tab design tends to become thicker and wider. However, a thicker and wider current collector requires more structural space in the assembly structure. With the external structure (i.e., overall volume) remaining unchanged, a larger current collector assembly space leads to a reduction in the cell's space, thereby lowering the cell's energy density, which contradicts the current market demand for high-energy-density batteries. Summary of the Invention

[0003] The inventors discovered through research that, for example Figure 1 As shown, when the structure of the full-tab battery tends to be wider and thicker, the folding space for axial installation of the current collector is insufficient, assuming the external and core structures remain unchanged. This leads to significant stress and deformation of the components in the cell that come into contact with the current collector. The constraint force at the final bend of the current collector originates from two points: one is the contact point between the lower edge of the cap and the aluminum sheet, and the other is the positive end face of the full-tab core. With a larger current collector thickness, the structural rigidity of the material increases (the bending radius R formed by bending under the same constraint force becomes larger), causing the bending force requirement to exceed the maximum compressive force that the structural rigidity at the upper and lower constraints can provide. This results in larger-than-expected deformation of the structural components in contact with it (i.e., the cap and the positive end face of the core). To ensure high-capacity, high-power cell design, the current collector design must ensure both good current carrying capacity and minimal assembly space requirements. Currently, without damaging the rest of the cell structure, the space wastage of the current collector mainly lies in its excessive bending rate. Therefore, this invention optimizes the bending state of the current collector through a novel structural design, reducing the space required after assembly.

[0004] The design of the tab bend in the current collector of existing battery cells usually adopts the method of extruding thinner material at the bend (i.e. forming a structure thinner than the body material at the bend radius). Although this method can improve some of the problems caused by excessively thick material leading to excessively large bending radius, the tab section of the current collector may still exert a squeezing effect on the upper and lower battery cell components at the bend due to the influence of the material thickness at the bend and process fluctuations.

[0005] In view of the shortcomings of the prior art, one object of this specification is to provide a cylindrical battery and its easily foldable current collector, which can effectively reduce the assembly space of the folded current collector and will not cause compression to other components.

[0006] To achieve the above objectives, this specification provides a foldable manifold, comprising: a circular portion, a first flat portion, and a second flat portion connected sequentially in a first direction; the manifold has opposing first and second surfaces;

[0007] A first bending portion is provided between the disc portion and the first flat plate portion. The first bending portion includes two first grooves extending along a second direction. The two first grooves are spaced apart on the first surface in a first direction. The second direction is perpendicular to the first direction.

[0008] A second bending portion is provided between the first flat plate portion and the second flat plate portion. The second bending portion includes two second grooves extending along a second direction. The two second grooves are distributed at intervals on the second surface in a first direction.

[0009] In a preferred embodiment, the width of the first groove gradually decreases, remains constant, or gradually increases along the direction from the first surface to the second surface; the width of the second groove gradually decreases, remains constant, or gradually increases along the direction from the second surface to the first surface; in a cross section perpendicular to the second direction, the shape of the first groove is one or a combination of triangles, trapezoids, rectangles, and arcs, and the shape of the second groove is one or a combination of triangles, trapezoids, rectangles, and arcs.

[0010] In a preferred embodiment, the width of the first groove gradually decreases along the direction from the first surface to the second surface; the width of the second groove gradually decreases along the direction from the second surface to the first surface; in a cross section perpendicular to the second direction, the first groove is triangular in shape, and the second groove is triangular in shape; the first groove has two opposing first sides; the second groove has two opposing second sides; preferably, the bottom of the first side is provided with rounded corners, and the bottom of the second side is provided with rounded corners.

[0011] In a preferred embodiment, the included angle between the two first sides of the first groove before folding is defined as the first included angle, and the included angle between the two second sides of the second groove before folding is defined as the second included angle; the first included angle is greater than or equal to 90°, and the second included angle is greater than or equal to 90°.

[0012] In a preferred embodiment, the included angle between the two first sides of the first groove after folding is defined as the third included angle, and the included angle between the two second sides of the second groove after folding is defined as the fourth included angle; the third included angle is 60°~120° smaller than the first included angle, and the fourth included angle is 60°~120° smaller than the second included angle.

[0013] In a preferred embodiment, after folding, the included angle between the two first surfaces at the first bend is 0~30°, and the included angle between the two second surfaces at the second bend is 0~30°.

[0014] In a preferred embodiment, the distance between the first surface and the second surface of the collector plate is a predetermined thickness; the spacing between the two first grooves in the first direction is 2 to 4 times the predetermined thickness; and the spacing between the two second grooves in the first direction is 2 to 4 times the predetermined thickness.

[0015] In a preferred embodiment, the depth of the first groove is ~ of the predetermined thickness; the depth of the second groove is ~ of the predetermined thickness.

[0016] In a preferred embodiment, the disc portion is provided with a central hole; before folding, the distance between the midpoint of the two first grooves and the center of the central hole is 3mm to 8mm; the distance between the midpoint of the two first grooves and the midpoint of the two second grooves is 6mm to 10mm.

[0017] This application also provides a cylindrical battery, including the foldable current collector as described in any of the preceding embodiments. Beneficial effects

[0018] The foldable collector provided in this embodiment includes a disc portion, a first flat plate portion, and a second flat plate portion. A first bending portion is provided between the disc portion and the first flat plate portion, and a second bending portion is provided between the first flat plate portion and the second flat plate portion. The first bending portion and the second bending portion are located on different surfaces of the collector, so that the collector can be bent at the first bending portion and the second bending portion to form a folded collector.

[0019] This easily foldable manifold changes the original bending structure to a three-section bending structure. A certain width area (the first and second bending sections) is selected at the bend as the intermediate transition section. Grooves (two first grooves and two second grooves) are created on both sides of this transition section. These grooves connect to the main body to be folded (the two first grooves connect to the disc section and the first flat section, respectively, and the two second grooves connect to the first and second flat sections, respectively). This method, using a bending transition section and double-groove control, precisely creates creases at the two grooves during folding. The optimal folding height is equal to the sum of the thicknesses of the disc section, the first flat section, and the second flat section of the manifold, and is positively correlated with the width of the transition section. By designing the groove spacing and groove shape, the stacking height of the manifold after bending can be effectively and stably controlled, thus effectively reducing the assembly space of the folded manifold and preventing compression of other components.

[0020] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not therefore limited in scope.

[0021] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0022] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the folded portion of the current collector of a cylindrical battery in the prior art;

[0025] Figure 2 This is a schematic diagram of the structure of a foldable collector disk before folding, as provided in this embodiment.

[0026] Figure 3 for Figure 2 A schematic diagram of the reverse structure;

[0027] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure of the AA surface in the middle;

[0028] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0029] Figure 6 for Figure 4 Enlarged structural diagram at point C;

[0030] Figure 7 This is a schematic diagram of another second groove provided in this embodiment;

[0031] Figure 8 This is a schematic diagram of another type of second groove provided in this embodiment;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of a foldable collector disk provided in this embodiment after folding;

[0033] Figure 10 for Figure 9 Top view;

[0034] Figure 11 for Figure 9 Side view;

[0035] Figure 12 for Figure 11 Enlarged structural diagram at point D;

[0036] Figure 13 for Figure 11 Enlarged structural diagram at point E;

[0037] Figure 14 This is a partial cross-sectional structural diagram of a cylindrical battery provided in this embodiment.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Collector plate; 11. First surface; 12. Second surface; 13. Disc portion; 131. Center hole; 14. First flat plate portion; 15. Second flat plate portion; 16. First bent portion; 161. First groove; 1611. First side surface; 17. Second bent portion; 171. Second groove; 1711. Second side surface; 18. Rounded corner;

[0040] 10. Cylindrical battery; 2. Inductor; 3. Cap; 4. Casing;

[0041] α1, First included angle; α2, Second included angle; β1, Third included angle; β2, Fourth included angle; γ1, Fifth included angle; γ2, Sixth included angle; t, Predetermined thickness; d1, Spacing between the two first grooves in the first direction; d2, Spacing between the two second grooves in the first direction; d3, Depth of the first groove; d4, Depth of the second groove; d5, Distance between the midpoint of the two first grooves and the center of the central hole; d6, Distance between the midpoint of the two first grooves and the midpoint of the two second grooves; X, First direction; Y, Second direction. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0043] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] Please see Figures 2 to 13 This application provides a foldable manifold 1, comprising: a circular portion 13, a first flat portion 14, and a second flat portion 15 sequentially connected in a first direction X. The manifold 1 has opposing first surfaces 11 and second surfaces 12.

[0046] Among them, such as Figure 2 and Figure 4As shown, a first bending portion 16 is provided between the disk portion 13 and the first flat plate portion 14. The first bending portion 16 includes two first grooves 161 extending along the second direction Y, and the two first grooves 161 are spaced apart on the first surface 11 in the first direction X. The second direction Y is perpendicular to the first direction X.

[0047] like Figure 3 and Figure 4 As shown, a second bending portion 17 is provided between the first flat plate portion 14 and the second flat plate portion 15. The second bending portion 17 includes two second grooves 171 extending along the second direction Y, and the two second grooves 171 are spaced apart on the second surface 12 in the first direction X.

[0048] The foldable manifold 1 provided in this embodiment includes a disc portion 13, a first flat plate portion 14, and a second flat plate portion 15. A first bending portion 16 is provided between the disc portion 13 and the first flat plate portion 14, and a second bending portion 17 is provided between the first flat plate portion 14 and the second flat plate portion 15. The first bending portion 16 and the second bending portion 17 are respectively located on different surfaces of the manifold 1, so that the manifold 1 can be bent at the first bending portion 16 and the second bending portion 17 to form a folded manifold 1.

[0049] The foldable manifold 1 changes the original bending structure to a three-section bending structure. A certain width area (i.e., the first bending section 16 and the second bending section 17) is selected at the bending point as the intermediate transition section. Grooves (i.e., two first grooves 161 and two second grooves 171) are formed on both sides of the transition section. The two grooves connect to the main body to be folded (the two first grooves 161 connect to the disc section 13 and the first flat section 14, respectively; the two second grooves 171 connect to the first flat section 14 and the second flat section 15, respectively). This method of controlling the transition section and the double grooves allows for precise crease formation at the two grooves during folding. The optimal folding height is equal to the sum of the thicknesses of the disc section 13, the first flat section 14, and the second flat section 15 of the manifold 1. This height is positively correlated with the width of the transition section between the grooves. By designing the matching of the groove spacing and groove shape, the stacking height of the manifold 1 after bending can be effectively and stably controlled, thereby effectively reducing the assembly space of the folded manifold 1 and preventing compression of other components.

[0050] In this embodiment, there are no fixed constraints on the shapes of the first groove 161 and the second groove 171. For example... Figure 6 , Figure 7 and Figure 8 As shown, on a cross section perpendicular to the second direction Y, the shape of the first groove 161 is one or a combination of triangles, trapezoids, rectangles, and arcs; the shape of the second groove 171 is one or a combination of triangles, trapezoids, rectangles, and arcs.

[0051] That is, along the direction from the first surface 11 to the second surface 12, the width of the first groove 161 gradually decreases (e.g., triangular groove and trapezoidal groove), remains unchanged (e.g., rectangular groove), gradually increases (e.g., inverted trapezoidal groove), or may first remain unchanged and then decrease, first increase and then remain unchanged and finally decrease (e.g., combined shape groove), etc. Along the direction from the second surface 12 to the first surface 11, the width of the second groove 171 gradually decreases, remains unchanged, or gradually increases, or may first remain unchanged and then decrease, first increase and then remain unchanged and finally decrease, etc. The width of the first groove 161 refers to its dimension in the first direction X, and the width of the second groove 171 refers to its dimension in the first direction X.

[0052] This embodiment does not impose a unique limitation on the shape of the first groove 161 and the second groove 171. By setting two first grooves 161 and two second grooves 171, the bending rate can be reduced during folding, thereby effectively reducing the assembly space of the folded collector plate 1 and preventing compression of other components. However, the implementation difficulty and effectiveness of different groove shapes vary.

[0053] In a most preferred embodiment, such as Figure 5 and Figure 6 As shown, in a cross-section perpendicular to the second direction Y, the first groove 161 and the second groove 171 are both triangular in shape. The first groove 161 has two opposing first side surfaces 1611. The second groove 171 has two opposing second side surfaces 1711. Along the direction from the first surface 11 to the second surface 12, the width of the first groove 161 (i.e., the distance between the two first side surfaces 1611) gradually decreases; along the direction from the second surface 12 to the first surface 11, the width of the second groove 171 (i.e., the distance between the two second side surfaces 1711) gradually decreases.

[0054] like Figure 5 and Figure 6 As shown, the bottom of the first side 1611 is provided with a rounded corner 18, and the bottom of the second side 1711 is provided with a rounded corner 18. That is, the bottom edge of the groove is rounded with a rounded corner 18, which can prevent stress during bending from causing cracks that damage the collector plate 1.

[0055] In this embodiment, such as Figure 5 As shown, the included angle between the two first sides 1611 of the first groove 161 before folding is defined as the first included angle α1. The first included angle α1 is greater than or equal to 90°, so that the first groove 161 can provide sufficient space for the bending of the collector plate 1, ensuring that the first bent part 16 will not be squeezed after the collector plate 1 is folded.

[0056] like Figure 6As shown, the included angle between the two second sides 1711 of the second groove 171 before folding is defined as the second included angle α2. The second included angle α2 is greater than or equal to 90°, so that the second groove 171 can provide sufficient space for the bending of the collector plate 1, ensuring that the second bent part 17 will not be squeezed after the collector plate 1 is folded.

[0057] In this embodiment, such as Figure 9 , Figure 10 and Figure 11 As shown, after bending the collector plate 1 along the first bend 16 and the second bend 17, the folded collector plate 1 can be obtained.

[0058] like Figure 12 As shown, the included angle between the two first sides 1611 of the first groove 161 after folding is defined as the third included angle β1, and the included angle between the two first surfaces 11 at the first bent portion 16 after folding is defined as the fifth included angle γ1. The third included angle β1 is 60°~120° smaller than the first included angle α1. That is, the folding angle of the first bent portion 16 relative to the disk portion 13 is 60°~120°, and the folding angle of the first bent portion 16 relative to the first flat plate portion 14 is 60°~120°, which can avoid excessive stress caused by excessive folding angle.

[0059] Furthermore, the fifth included angle γ1 is 0~30°. If the fifth included angle γ1 is too large, it means that the first bending part 16 is not folded properly, and the assembly space of the folded collector plate 1 cannot be effectively reduced.

[0060] like Figure 13 As shown, the included angle between the two second sides 1711 of the second groove 171 after folding is defined as the fourth included angle β2, and the included angle between the two second surfaces 12 at the second bend 17 after folding is defined as the sixth included angle γ2. The fourth included angle β2 is 60°~120° smaller than the second included angle α2. That is, the folding angle of the second bend 17 relative to the first flat plate 14 is 60°~120°, and the folding angle of the second bend 17 relative to the second flat plate 15 is 60°~120°, which can avoid excessive stress caused by excessive folding angle.

[0061] Furthermore, the sixth included angle γ2 is 0~30°. If the sixth included angle γ2 is too large, it means that the second bending part 17 is not folded properly, and the assembly space of the folded collector plate 1 cannot be effectively reduced.

[0062] like Figure 5 and Figure 6As shown, the distance between the first surface 11 and the second surface 12 of the collector plate 1 is defined as a predetermined thickness t. The distance d1 between the two first grooves 161 in the first direction X is 2 to 4 times the predetermined thickness t, and the distance d2 between the two second grooves 171 in the first direction X is 2 to 4 times the predetermined thickness t, thereby effectively and stably controlling the stacking height of the collector plate 1 after bending.

[0063] Furthermore, the depth d3 of the first groove 161 is ~ of the predetermined thickness t, and the depth d4 of the second groove 171 is ~ of the predetermined thickness t. This avoids the first groove 161 or the second groove 171 being too shallow, which would prevent the compression of other components from being effectively reduced. It also avoids the first groove 161 or the second groove 171 being too deep, which would result in insufficient strength at the first bend 16 or the second bend 17 of the collector plate 1.

[0064] In this embodiment, the disc portion 13 is provided with a central hole 131. Before folding, the distance d5 between the middle position of the two first grooves 161 and the center of the central hole 131 is 3mm to 8mm. That is, the distance between the first bending portion 16 and the disc portion 13 is reasonably set, which can avoid the disc portion 13 not being able to make good contact with the positive end face of the winding core 2 due to the distance being too small, and also avoid the current collector 1 interfering with the battery casing 4 due to the distance being too large.

[0065] Furthermore, before folding, the distance d6 between the midpoint of the two first grooves 161 and the midpoint of the two second grooves 171 is 6mm~10mm. This reasonable setting of the distance between the first bending portion 16 and the second bending portion 17 avoids uneven stress on the current collector 1 after folding due to an excessively small distance, and also avoids interference between the current collector 1 and the battery casing 4 due to an excessively large distance. Correspondingly, the distance between the midpoint of the two second grooves 171 and the center of the central hole 131 is 9mm~18mm.

[0066] To demonstrate the advantages of the foldable manifold 1 provided in this application, the following three embodiments and two comparative examples are presented, and their folded states are analyzed.

[0067] Example 1: Using the structure of the foldable manifold 1 provided in this application, the cross-sectional shape of the first groove 161 and the second groove 171 is triangular, as shown... Figure 6 As shown. Its creases are stable, and there is no local compression of the upper and lower structures at the bend.

[0068] Example 2: Using the structure of the foldable manifold 1 provided in this application, the cross-sectional shape of the first groove 161 and the second groove 171 is trapezoidal, as shown... Figure 7 As shown. Its creases are stable, and there is no local compression of the upper and lower structures at the bend.

[0069] Example 3: Using the structure of the foldable manifold 1 provided in this application, the cross-sectional shape of the first groove 161 and the second groove 171 is rectangular, as shown... Figure 8 As shown. Its creases are stable, and there is no local compression of the upper and lower structures at the bend.

[0070] Example 4: The structure of the foldable manifold 1 provided in this application is adopted. The cross-sectional shape of the first groove 161 and the second groove 171 is an inwardly concave arc (not shown). Its creases are stable, and there is no local compression on the upper and lower structures at the bend.

[0071] Comparative Example 1: This manifold does not have grooves. Its creases are unstable, the bending points are uncontrollable, and the bending points cause severe local compression to the upper and lower structures.

[0072] Comparative Example 2: This manifold has only a single groove at the bend, which differs from the double-groove structure of this application. Its crease is stable, but there is still some local compression on the upper and lower structures at the bend.

[0073] The results of the above embodiments and comparative examples show that the structure of the foldable manifold 1 provided in this application can ensure stable creases and prevent compression of other components in contact with the manifold 1.

[0074] Comparative Example 1 shows that without grooves or thinning treatment, the lack of a weak point to guide the bending results in several drawbacks. First, the bending point is uncontrollable, severely affecting the consistency of bending and welding. Second, the absence of a weak point to accommodate the bent foil causes the manifold near the bending point to have an excessively large bending radius (R-angle). Consequently, the upper end of the bending radius exerts pressure on the cap (the pressure is as follows). Figure 1 F in 上 As shown), the lower end at the bent R-angle exerts pressure on the upper surface of the omnipolar cell (the pressure is as follows). Figure 1 F in 下 As shown in the figure, this severely affects battery performance.

[0075] Comparative Example 2 features a single groove at the bend, which somewhat alleviates the problem in Comparative Example 1, for example, by guiding the bend point, which typically occurs at the groove. Simultaneously, the stress on the current collector is reduced during bending due to the single groove, mitigating the problem of excessive radius (R-angle). However, the excessively large bending R-angle is still observed in Comparative Example 2. In actual experiments, this simple single-groove treatment still fails to achieve the technical effect required by this invention. Comparative Example 2 still shows compression of the cap and the upper surface of the all-tab cell, failing to eliminate this compression problem. Therefore, in summary, Comparative Example 2 only appropriately alleviates the problem of Comparative Example 1 and does not achieve the fundamental elimination of the compression problem required by this invention.

[0076] Based on the same concept, this invention also provides a cylindrical battery 10, as described in the following embodiments. Since the principle by which the cylindrical battery 10 solves the problem and the technical effects it can achieve are similar to those of the foldable current collector 1 described above, the implementation of the cylindrical battery 10 can refer to the implementation of the foldable current collector 1 described above, and the repeated parts will not be described again.

[0077] like Figure 14 As shown, one embodiment of the present invention also provides a cylindrical battery 10, including: a foldable current collector 1 as described in any of the above embodiments. The disc portion 13 of the current collector 1 is in contact with the positive end face of the winding core 2, and the second flat portion 15 of the current collector 1 is in contact with the lower end of the cap 3.

[0078] It should be noted that the cylindrical battery 10 provided in this embodiment, including the winding core 2, cap 3, and other parts (such as the outer casing 4), can be any suitable existing structure. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be described in detail here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that this embodiment is not limited in scope as a result.

[0079] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0080] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0081] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0082] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0083] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0084] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A foldable manifold, characterized in that, include: A disk portion, a first plate portion, and a second plate portion are connected sequentially in a first direction; the collector disk has a first surface and a second surface opposite to each other; A first bending portion is provided between the disc portion and the first flat plate portion. The first bending portion includes two first grooves extending along a second direction. The two first grooves are spaced apart on the first surface in a first direction. The second direction is perpendicular to the first direction. A second bending portion is provided between the first flat plate portion and the second flat plate portion. The second bending portion includes two second grooves extending along a second direction. The two second grooves are distributed at intervals on the second surface in a first direction.

2. The foldable manifold according to claim 1, characterized in that, Along the direction from the first surface to the second surface, the width of the first groove gradually decreases, remains constant, or gradually increases; along the direction from the second surface to the first surface, the width of the second groove gradually decreases, remains constant, or gradually increases. On a cross section perpendicular to the second direction, the shape of the first groove is one or a combination of triangles, trapezoids, rectangles, and arcs, and the shape of the second groove is one or a combination of triangles, trapezoids, rectangles, and arcs.

3. The foldable manifold according to claim 2, characterized in that, Along the direction from the first surface to the second surface, the width of the first groove gradually decreases; along the direction from the second surface to the first surface, the width of the second groove gradually decreases; in a cross section perpendicular to the second direction, the shape of the first groove is triangular, and the shape of the second groove is triangular. The first groove has two opposing first sides; the second groove has two opposing second sides; preferably, the bottom of the first side is provided with rounded corners, and the bottom of the second side is provided with rounded corners.

4. The foldable manifold according to claim 3, characterized in that, The included angle between the two first sides of the first groove before folding is defined as the first included angle, and the included angle between the two second sides of the second groove before folding is defined as the second included angle; the first included angle is greater than or equal to 90°, and the second included angle is greater than or equal to 90°.

5. The foldable manifold according to claim 4, characterized in that, The included angle between the two first sides of the first groove after folding is defined as the third included angle, and the included angle between the two second sides of the second groove after folding is defined as the fourth included angle; the third included angle is 60°~120° smaller than the first included angle, and the fourth included angle is 60°~120° smaller than the second included angle.

6. The foldable manifold according to claim 5, characterized in that, After folding, the included angle between the two first surfaces at the first bend is 0~30°, and the included angle between the two second surfaces at the second bend is 0~30°.

7. The foldable manifold according to claim 1, characterized in that, The distance between the first and second surfaces of the collector plate is a predetermined thickness; the spacing between the two first grooves in the first direction is 2 to 4 times the predetermined thickness; the spacing between the two second grooves in the first direction is 2 to 4 times the predetermined thickness.

8. The foldable manifold according to claim 7, characterized in that, The depth of the first groove is ~ of the predetermined thickness; the depth of the second groove is ~ of the predetermined thickness.

9. The foldable manifold according to claim 1, characterized in that, The disc portion has a central hole; before folding, the distance between the midpoint of the two first grooves and the center of the central hole is 3mm~8mm; the distance between the midpoint of the two first grooves and the midpoint of the two second grooves is 6mm~10mm.

10. A cylindrical battery, characterized in that, Includes the foldable manifold as described in any one of claims 1 to 9.

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