Collecting plate and battery

Abstract

The utility model relates to the field of batteries, and discloses a collector plate and a battery, the collector plate comprises a plate body, first protrusions, second protrusions and third protrusions, the plurality of first protrusions are uniformly arranged on the plate body at intervals, liquid injection ports are formed between the adjacent first protrusions, the liquid injection ports are formed in the plate body in a penetrating manner, and the second protrusions are arranged on the plate body. The second protrusions are arranged at the ends, facing the center of the disc body, of the first protrusions, and the third protrusions are arranged at the ends, away from the center of the disc body, of the first protrusions. The first protrusions are arranged on the disc body, the second protrusions and the third protrusions are arranged at the two ends of the first protrusions respectively, the first protrusions, the second protrusions and the third protrusions form the bosses, and the bosses can make full contact with the flattened tabs and can flatten the tilted tabs again, so that the tabs make full contact with the tabs, and the tab flattening efficiency is improved. And short circuit caused by poor cell contact is prevented.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a collecting plate and a battery. Background Art

[0002] In traditional cylindrical battery cells, a tab is usually extended from the positive and negative electrodes of the core to connect the top cover and the shell, serving as a conductive channel for the positive and negative electrodes. Due to the size limitation of the tab, the current carrying capacity of the battery cell is limited. The full-tab technology, on the other hand, is a design and technology that extends the copper foil and aluminum foil on both sides of the positive and negative electrodes of the core to the two ends of the core as tabs, then welds the collector plate and the tabs, and finally welds the collector plate to the top cover (or pole column) and the shell. The full-tab technology can greatly increase the connection area between the battery core, pole column, and shell, thereby improving the current carrying capacity of the battery cell, reducing the internal resistance of the battery cell, and ultimately improving the power and fast charging performance of the cylindrical battery cell.

[0003] At present, the mainstream full-tab technology adopts a cut-and-stack tab design: the empty foil tabs at both ends of the core are cut into strips by laser and folded and flattened toward the center of the core to form a welding surface, and then a laser is used to penetrate the collector plate to weld the collector plate and the welding surface.

[0004] A major difficulty with this technical solution is that, due to the limitations of the laser die-cutting process, the tabs are evenly distributed and of similar length on the end face of the core. This results in uneven distribution of tab layers on the surface formed after folding. That is, the number of layers of the hollow foil tabs varies at different locations, with fewer layers at the center and edges of the core, and only one annular area on the entire end face of the core having more tab layers that is suitable for stable and cut welding. Furthermore, the welding surface formed by the tabs is not a plane, while conventional collector plates are planar structures. This can result in a large gap between the contact surface of the hollow foil tabs and the conventional collector plates. This gap can easily lead to poor contact between the tabs and the collector plates, and a lack of close fit can cause phenomena such as blown welds, over-welding, and cold welds during the laser welding process of the tabs and the collector plates. Utility Model Content

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a current collecting tray and a battery.

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] This application provides:

[0008] A collecting plate, comprising:

[0009] disc body;

[0010] a first protrusion, wherein a plurality of the first protrusions are evenly spaced and arranged on the disc body, and a liquid injection port is provided between adjacent first protrusions, and the liquid injection port is opened through the disc body;

[0011] a second protrusion disposed at an end of each of the first protrusions towards the center of the disc body;

[0012] a third protrusion disposed at an end of each of the first protrusions away from the center of the disc body.

[0013] Further, the first protrusions are parallel to the surface of the disc body, the second protrusions are disposed obliquely relative to the surface of the disc body, and the third protrusions are disposed obliquely relative to the surface of the disc body.

[0014] Further, the distance between the surface of the first protrusions and the surface of the disc body is L, satisfying: 0.1mm≤L≤0.6mm.

[0015] Further, the angle formed between the second protrusions and the surface of the disc body is a, satisfying: 0°<a≤15°.

[0016] Further, the distance between the highest point of the second protrusions and the surface of the disc body and the distance between the highest point of the third protrusions and the surface of the disc body are both H, satisfying: 0.2mm≤H≤1mm.

[0017] Further, the angle formed between the third protrusions and the surface of the disc body is β, satisfying: 0°<β≤20°.

[0018] Further, the radius of the disc body is R, the length of the first protrusions in the radial direction of the disc body is W1, the length of the second protrusions is W2, and the length of the third protrusions is W3, wherein W1+W2+W3=W, satisfying: W≥0.3R.

[0019] Further, the number of the first protrusions is N, satisfying: N≥2, and the first protrusions are uniformly distributed about the center of the disc body.

[0020] Further, the shape of the liquid injection port is circular, fan-shaped, oval, or polygonal.

[0021] The application provides a battery comprising the current collecting disc.

[0022] The application provides a battery comprising the current collecting disc.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It shows a schematic structural diagram of the current collecting plate of the present application in a state of four first protrusions;

[0026] Figure 2 It shows a bottom view of the current collecting plate of the present application having four first protrusions;

[0027] Figure 3 It shows a cross-sectional schematic diagram of the current collecting plate of the present application having four first protrusions;

[0028] Figure 4 Shows this application Figure 3 A in the middle is an enlarged structural diagram;

[0029] Figure 5 Shows this application Figure 3 The enlarged structural diagram at B in the middle;

[0030] Figure 6 It shows a schematic structural diagram of the current collecting plate of the present application in three first convex states;

[0031] Figure 7 A schematic structural diagram showing the protrusion of the collecting plate of the present application in a fan-shaped state is shown.

[0032] Explanation of the main component symbols: 100 - disk body; 200 - first protrusion; 300 - second protrusion; 400 - third protrusion; 500 - liquid injection port. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0034] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0038] The existing battery cell is generally formed by winding the positive electrode, the separator, the negative electrode and the separator around the center axis in sequence to form a roll core, and the positive and negative electrode blank foil tabs are formed at both ends of the roll core. The laser die-cutting forms a strip-shaped tab, and after winding, it is pushed down to the center of the end face and flattened.

[0039] The existing current collecting plate structure is usually a planar structure, and after the lug is cut and folded, the distribution of the tab layers is uneven, which causes the surface to be non-planar, and further causes a gap between the planar current collecting plate and the tab, which easily causes poor contact and may even cause short circuit. Therefore, the surface of the current collecting plate is designed to be convex, so that it can fully contact the tab, thereby preventing the occurrence of poor contact.

[0040] The current collecting plate provided by the application can be used for the positive and negative terminals of the battery, and the material of the current collecting plate should be one of aluminum alloy and nickel-plated aluminum alloy; the material of the negative terminal current collecting plate should be one of copper and nickel-plated copper.

[0041] Specifically, the application provides a current collecting plate, which comprises a disc body 100, a first protrusion 200, a second protrusion 300, and a third protrusion 400.

[0042] The first protrusion 200 has a plurality of first protrusions 200 uniformly spaced on the disc body 100, and a liquid injection port 500 is provided between adjacent first protrusions 200, the liquid injection port 500 being provided through the disc body 100, the second protrusion 300 being provided at the end of each first protrusion 200 towards the center of the disc body 100, and the third protrusion 400 being provided at the end of each first protrusion 200 away from the center of the disc body 100.

[0043] Referring to Figure 1 As shown in the drawings, the first protrusion 200, the second protrusion 300, and the third protrusion 400 are convexly arranged on the surface of the disc body 100, and in this embodiment, the first protrusion 200, the second protrusion 300, and the third protrusion 400 are integrally formed by coining, and the first protrusion 200, the second protrusion 300, and the third protrusion 400 form a boss protruding from the surface of the disc body 100. Therefore, when welding, the boss will contact the tab in a flattened state, thereby flattening the tab that may have been warped again, allowing the boss to fully contact the tab in a flattened state, thereby improving the adhesion of the disc body 100 to the tab and preventing poor contact, short circuit, and other phenomena.

[0044] The first protrusion 200 is parallel to the surface of the disc body 100, the second protrusion 300 is inclined relative to the surface of the disc body 100, and the third protrusion 400 is inclined relative to the surface of the disc body 100.

[0045] In this embodiment, the surface of the disc body 100 mentioned above is the side facing the tab, i.e. the side in the direction of the convexity of the first protrusion 200, the second protrusion 300, and the third protrusion 400.

[0046] Please refer to Figure 1 ,Figure 2 and Figure 3 As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in Figure 1 and Figure 3 As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in

[0047] In the embodiment, the heights of the second protrusion 300 and the third protrusion 400 are higher than that of the first protrusion 200, and therefore, the first protrusion 200, the second protrusion 300 and the third protrusion 400 form a "concave" shape.

[0048] The distance between the surface of the first protrusion 200 and the surface of the disc body 100 is L, and satisfies: 0.1mm≤L≤0.6mm.

[0049] As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in

[0050] The included angle between the second protrusion 300 and the surface of the disc body 100 is α, and satisfies: 0°<α≤15°.

[0051] As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in Figure 4 As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in

[0052] The distance between the highest point of the second protrusion 300 and the surface of the disc body 100 and the distance between the highest point of the third protrusion 400 and the surface of the disc body 100 are both H, and satisfy: 0.2mm≤H≤1mm.

[0053] As shown in FIG. 2, the second protrusion 300 and the third protrusion 400 are located at two ends of the first protrusion 200, and the inclination directions of the second protrusion 300 and the third protrusion 400 are opposite, that is, the inclination directions of the second protrusion 300 and the third protrusion 400 are different, which can be referred to in detail in Figure 3 and Figure 4As shown, the distance between the highest point of the second protrusion 300 and the surface of the disc body 100 can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, etc., which can be selected according to actual needs.

[0054] The third protrusion 400 forms an angle β with the surface of the disc body 100, which satisfies: 0°<β≤20°.

[0055] As shown, Figure 5 As shown above, the angle β between the third protrusion 400 and the surface of the disc body 100 is the inclination angle of the third protrusion 400, which can be between 0° and 20°. For example, β can be 5°, 10°, 15°, 20°, etc., which can be selected according to needs.

[0056] The radius of the disc body 100 is R, the length of the first protrusion 200 in the radial direction of the disc body 100 is W1, the length of the second protrusion 300 is W2, and the length of the third protrusion 400 is W3, wherein W1+W2+W3=W, which satisfies: W≥0.3R.

[0057] As shown, Figure 1 As shown, the first protrusion 200, the second protrusion 300, and the third protrusion 400 are distributed in the radial direction of the disc body 100. In order to have a larger area that fits the tab, the sum of the directions of each group of first protrusions 200, second protrusions 300, and third protrusions 400 on the disc body 100 is 30% of the radius of the disc body 100, and the specific proportion is not limited here.

[0058] The number of first protrusions 200 is N, which satisfies: N≥2, and the first protrusions 200 are uniformly distributed about the center of the disc body 100.

[0059] As shown, Figure 1 , Figure 6 and Figure 7 In order to increase the contact area with the tab, the number of first protrusions 200 is greater than 2. Of course, since the second protrusion 300 and the third protrusion 400 are located at the end of the first protrusion 200, the number of second protrusions 300 and third protrusions 400 is the same as that of the first protrusions 200, i.e., each first protrusion 200, second protrusion 300, and third protrusion 400 forms a boss, and the number of bosses is the number of first protrusions 200. Figure 1 A schematic diagram showing that the first protrusion 200 has four states, Figure 6 A schematic diagram showing that the first protrusion 200 has six states, Figure 7 A schematic diagram showing that the first protrusion 200 has three states.

[0060] The liquid injection port 500 is in a shape of a circle, a sector, an ellipse, or a polygon.

[0061] Referring to Figure 1 , Figure 2 , Figure 6 and Figure 7 , in order to facilitate injection of electrolyte into the battery cell, a liquid injection port 500 is formed through the surface of the disc body 100, and electrolyte is injected into the battery cell through the liquid injection port 500. The shape of the liquid injection port 500 can be a circle, a sector, an ellipse, or a polygon, or a combination of the above shapes. In this embodiment, the liquid injection port 500 is in a circular shape.

[0062] Referring to Figure 7 , the shapes of the first protrusion 200, the second protrusion 300, and the third protrusion 400 are not limited herein, i.e., the first protrusion 200 can be in a rectangular shape or a sector shape, and correspondingly, the second protrusion 300 and the third protrusion 400 can also be in a rectangular shape or a sector shape. Figure 7 The first protrusion 200, the second protrusion 300, and the third protrusion 400 are in a sector shape.

[0063] The application also provides a battery comprising the current collecting disc.

[0064] In this embodiment, the battery comprises a battery cell having a flattened tab, and during assembly, the first protrusion 200, the second protrusion 300, and the third protrusion 400 abut against the flattened tab, and then the first protrusion 200 is connected to the tab by laser welding or the like.

[0065] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the present application.

Claims

1. A current collector plate, characterized by, The utility model relates to a kind of battery plate, including: Disc (100); First protrusion (200), a plurality of the first protrusion (200) is evenly spaced on the disc (100), and liquid injection port (500) is provided between adjacent first protrusion (200), and the liquid injection port (500) is opened on the disc (100); Second protrusion (300), the second protrusion (300) is provided at the end of each first protrusion (200) towards the center of the disc (100); Third protrusion (400), the third protrusion (400) is provided at the end of each first protrusion (200) away from the center of the disc (100).

2. The current plate of claim 1, wherein The first protrusion (200) is parallel to the surface of the disc (100), the second protrusion (300) is inclined relative to the surface of the disc (100), and the third protrusion (400) is inclined relative to the surface of the disc (100).

3. The current plate of claim 1, wherein The distance between the surface of the first protrusion (200) and the surface of the disc (100) is L, which satisfies: 0.1mm≤L≤0.6mm.

4. The current plate of claim 1, wherein The angle formed by the second protrusion (300) and the surface of the disc (100) is α, which satisfies: 0°<α≤15°.

5. The current plate of claim 1, wherein The distance between the highest point of the second protrusion (300) and the surface of the disc (100) and the distance between the highest point of the third protrusion (400) and the surface of the disc (100) are both H, which satisfies: 0.2mm≤H≤1mm.

6. The current plate of claim 1, wherein The angle formed by the third protrusion (400) and the surface of the disc (100) is β, which satisfies: 0°<β≤20°.

7. The current plate of claim 1, wherein The radius of the disc (100) is R, the length of the first protrusion (200) in the radial direction of the disc (100) is W1, the length of the second protrusion (300) is W2, and the length of the third protrusion (400) is W3, wherein W1+W2+W3=W, which satisfies: W≥0.3R.

8. The current plate of claim 1, wherein, The number of first protrusions (200) is N, which satisfies: N≥2, and the first protrusions (200) are evenly spaced around the center of the disc (100).

9. The current plate of claim 1, wherein, The shape of the liquid injection port (500) is circular, fan-shaped, oval, or polygonal.

10. A battery, characterized by The battery plate of any one of claims 1 to 9 is included.

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