Battery cell shaping pressing plate structure

Abstract

The utility model relates to the technical field of battery cell shaping, in particular to a battery cell shaping pressing plate structure which comprises a main body frame, a pressing plate and a pressing plate, the lower pressing plate is movably arranged on the main body frame; the profiling shaping mechanism is arranged in the main body frame and is used for driving the lower pressing plate to move so as to shape the battery cell; wherein the lower pressing plate is made of a flexible material, and the profiling shaping mechanism is used for uniformly acting gas entering from the gas inlet on each position of the lower pressing plate, so that the surface of the battery cell is uniformly stressed. According to the application, the profiling shaping mechanism is arranged and the lower pressing plate is made of the flexible material, so that the lower pressing plate has a profiling effect, uniform external force is applied to the battery cell, and the battery cell is subjected to voltage-sharing shaping.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core shaping, and more specifically, to a battery core shaping pressure plate structure. Background Art

[0002] In the field of secondary battery manufacturing, the flattening pressure processing of the battery cell is a crucial link, which is directly related to the final performance and reliability of the battery. This step is particularly important in the process of manufacturing the battery cell using the winding process.

[0003] The manufacture of wound battery cells is to wind up the positive electrode sheet, negative electrode sheet and the separator between them layer by layer through precise mechanical devices. In this process, because the inner and outer layers of the battery cell are in different positions, they are affected by different factors such as the internal tension of the electrode sheet, their own gravity, and the mechanical stress during the winding process. Specifically, the inner layer of the battery cell is tightly wrapped by the outer layer material, so it is subject to relatively large tension and is difficult to balance through external adjustments; while the outer layer is relatively free and its deformation is less restricted. This uneven force on the inner and outer layers can easily cause the separator and electrode of the inner layer of the battery cell to be folded, wrinkled, and other undesirable phenomena under the action of their own tension.

[0004] The appearance of folds and wrinkles not only destroys the flatness of the internal structure of the battery cell, but may also have a series of negative effects on the performance of the battery. On the one hand, wrinkles and folds will increase the internal resistance of the battery cell, causing unnecessary loss of current during transmission, thereby reducing the energy conversion efficiency of the battery; on the other hand, these uneven areas may become potential risk points for micro-short circuits inside the battery, further threatening the safety performance of the battery; in addition, wrinkles may also affect the uniform distribution and wetting effect of the electrolyte, reducing the cycle stability and service life of the battery.

[0005] Therefore, after winding, the battery cell needs to be subjected to special pressure processing. This step flattens the battery cell by applying uniform and moderate external force, aiming to eliminate or reduce the folding and wrinkling of the inner layer of the battery cell. At the same time, the pressure processing can further compress the internal space of the battery cell, improve the contact tightness between the positive and negative electrodes and the separator, and thus optimize the energy density and cycle performance of the battery.

[0006] At present, the existing pressure plates for shaping battery cells do not have a profiling function, such as a lithium battery core pack shaping device with publication number CN220510083U. Therefore, the downward pressure on the battery cell will be unevenly distributed. After the battery cell is squeezed, it will cause irreversible shaping losses at the corners of the inner circle pole pieces of the battery cell. Utility Model Content

[0007] The main purpose of the utility model is to provide a pressure plate structure for shaping a battery cell after winding, which is intended to solve the problem that the inner circle of the existing wound battery cell is folded due to the fluffiness of the battery cell.

[0008] In order to solve the above technical problems, the utility model proposes a battery cell shaping plate structure, comprising:

[0009] A main frame, one end of which is provided with an air inlet;

[0010] A lower pressure plate, movably arranged on the main frame;

[0011] and a profiling and shaping mechanism, which is arranged in the main frame and is used to drive the lower pressing plate to move so as to shape the battery cell;

[0012] The lower pressure plate is made of flexible material, and the contour shaping mechanism is used to uniformly apply the gas entering from the air inlet to various positions of the lower pressure plate so that the surface of the battery cell is evenly stressed.

[0013] In the above technical solution, further, the profiling and shaping mechanism includes:

[0014] The gas shaft assembly has several groups and is evenly distributed in the main frame;

[0015] The amount of gas entering through the air inlet causes each gas shaft assembly to extend and act on the lower pressure plate, causing the lower pressure plate to move.

[0016] In any of the above technical solutions, further, the air shaft assembly includes:

[0017] Cylinder barrel;

[0018] And the air shaft is slidably arranged in the cylinder barrel, and one end of the air shaft extends from the cylinder barrel and then extends toward the lower pressure plate.

[0019] In any of the above technical solutions, further, the gas shaft is a T-shaped structure.

[0020] In any of the above technical solutions, further, the outer edge of the lower pressing plate is a folding structure.

[0021] In any of the above technical solutions, further, the end surface of the lower pressing plate in contact with the battery cell has a polygonal texture.

[0022] In any of the above technical solutions, further, a diverter plate is provided in the main frame, and a plurality of air holes are evenly provided on the diverter plate;

[0023] Wherein, each air shaft assembly is communicated with each air hole respectively.

[0024] In any of the above technical solutions, further, the main framework includes:

[0025] A square frame with openings at the upper and lower ends;

[0026] A conical cover is arranged on the upper port of the square frame, and the air inlet is located on the conical cover;

[0027] Wherein, the lower pressure plate is arranged on the lower port of the square frame.

[0028] In any of the above technical solutions, further, the conical cover is detachably arranged on the square frame.

[0029] In any of the above technical solutions, further, a limiting groove is opened on the square frame, the outer edge of the diverter plate is embedded in the limiting groove, and after the conical cover is closed on the square frame, the conical cover abuts against one end face of the diverter plate facing away from the limiting groove.

[0030] Beneficial effect: Compared with the prior art, the present application provides a profiling shaping mechanism and makes the lower pressure plate of flexible material, so that the lower pressure plate has a profiling effect, thereby achieving uniform external force on the battery cell and uniform pressure shaping of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of the utility model;

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0034] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0035] Figure 4 It is a schematic diagram of the structure of the utility model when it is in contact with the battery core;

[0036] Figure 5 It is a schematic diagram of the structure of the utility model when the battery core is compressed.

[0037] The following are the descriptions of the reference numerals:

[0038] 10. Battery cell; 100. Main frame; 101. Air inlet; 110. Square frame; 111. Limiting groove; 120. Conical cover; 200. Lower pressure plate; 300. Profiling and shaping mechanism; 310. Air shaft assembly; 311. Cylinder barrel; 312. Air shaft; 400. Diverter plate; 410. Air hole. DETAILED DESCRIPTION

[0039] Below, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0040] It should be noted that, as shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0041] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0044] Since the surface of the battery cell after winding is uneven, the battery cell needs to be squeezed to shape it into a regular sheet structure. When the lower pressure plate on the traditional shaping machine acts on the surface of the battery cell, the lower pressure plate cannot adapt to the uneven surface of the battery cell, so that the external force at each position of the battery cell is different, which can easily cause damage to the corners of the inner circle electrode of the battery cell. Based on this, the present application proposes a battery cell shaping plate structure, which achieves the shaping of the battery cell by applying uniform external force to the surface of the battery cell.

[0045] The cell shaping plate structure of the present application is described in detail through the following embodiments.

[0046] Embodiment 1:

[0047] like Figure 1-Figure 4 As shown, in this embodiment, a cell shaping plate structure includes: a main frame 100, one end of which is provided with an air inlet 101; a lower pressing plate 200, which is movably arranged on the main frame 100; and a profiling shaping mechanism 300, which is arranged in the main frame 100 and is used to drive the lower pressing plate 200 to move so as to shape the cell;

[0048] The lower pressing plate 200 is made of a flexible material, and the contour shaping mechanism 300 is used to uniformly apply the gas entering from the air inlet 101 to various positions of the lower pressing plate 200 so that the surface of the battery cell is subjected to uniform force.

[0049] By providing a profiling shaping mechanism 300 and making the lower pressing plate 200 of a flexible material, the lower pressing plate 200 has a profiling effect. The profiling effect means that the end surface of the lower pressing plate 200 in contact with the battery cell can adapt to the surface of the battery cell, thereby achieving uniform external force on the battery cell.

[0050] By delivering gas to the air inlet 101, the gas acts on the profiling and shaping mechanism 300, and the profiling and shaping mechanism 300 then acts on the lower pressure plate 200, so that the lower pressure plate 200 squeezes the battery cell after being subjected to external force. At this time, the profiling and shaping mechanism 300 can disperse the gas and act on various positions of the lower pressure plate 200, so that after the lower pressure plate 200 contacts the surface of the battery cell, according to the actual structure of the surface of the battery cell, the lower pressure plate 200 is deformed and adapted to the surface of the battery cell, thereby achieving the effect of equalizing the pressure of the battery cell.

[0051] Specifically, the contour shaping mechanism 300 includes: a gas shaft assembly 310 having a plurality of groups and evenly distributed within the main frame 100;

[0052] The amount of gas entering through the air inlet 101 causes each gas shaft assembly 310 to extend and act on the lower pressing plate 200, so that the lower pressing plate 200 moves.

[0053] The air shaft assembly 310 refers to a structure similar to a miniature cylinder. Since the air pressure entering each air shaft assembly 310 is the same, when the lower pressure plate 200 is not in contact with the battery cell, the elongation of each air shaft assembly 312310 is the same; when the lower pressure plate 200 is in contact with the battery cell, due to the uneven surface of the battery cell, the initial time for the telescopic cylinders at different positions to act on the battery cell is different. As time goes by, the lower pressure plate 200 is deformed under the action of each telescopic cylinder, and its various positions gradually adapt to the surface of the battery cell, thereby achieving uniform shaping of the battery cell.

[0054] It should be noted that the structure of the air shaft assembly 310 is not unique, as long as it can achieve the effect of applying a uniform pressure to the lower pressure plate 200 .

[0055] The structure of a gas shaft assembly 312310 is provided below. The gas shaft assembly 310 includes: a cylinder 311; and a gas shaft 312. The gas shaft 312 is a T-shaped structure, with its large end slidingly disposed in the cylinder 311, and its small end extending from the cylinder 311 and extending toward the downward pressure plate 200.

[0056] After the gas enters the main frame 100 from the inlet, it acts on each gas shaft assembly 312310. Under the action of gas pressure, the gas shaft 312 is pushed outward. The pushed outward gas shaft 312 then acts on the lower pressure plate 200, so that the lower pressure plate 200 can move outward, thereby squeezing the battery cell.

[0057] It should be noted that, on the one hand, the lower pressing plate 200 and the main frame 100 can be connected by a sliding seal, and when the lower pressing plate 200 is pushed by the air shaft assembly 310, it can move outward.

[0058] On the other hand, since the lower pressure plate 200 mainly plays the role of a skin, it links and protects the air shaft components 310. To this end, the lower pressure plate 200 can be set to have a folding structure at its outer edge, and the folding structure at the outer edge is connected to the main frame 100. When the lower pressure plate 200 is subjected to force, its folding structure is stretched, thereby changing the position of the lower pressure plate 200. This design is not only convenient for installation and replacement, but also simple in structure and highly practical.

[0059] Specifically, the folding structure is to divide the lower pressure plate into a plurality of pressure units, and grooves extending along the length direction of the pressure units are formed between the pressure units, and the pressure units can be folded relative to each other through the grooves.

[0060] It should be noted that the lower pressing plate 200 has insulating properties and good wear resistance to extend its service life.

[0061] Embodiment 2:

[0062] This embodiment is a further improvement made on the basis of the first embodiment.

[0063] like Figure 1 As shown, in this embodiment, the end surface of the lower pressing plate 200 in contact with the battery cell has a polygonal texture. The lower end surface of the lower pressing plate 200 is set to a polygonal texture, specifically a regular octagonal texture.

[0064] Embodiment three:

[0065] This embodiment is a further improvement made on the basis of any of the above embodiments.

[0066] like Figure 2 and Figure 3 As shown, in this embodiment, a diverter plate 400 is disposed in the main frame 100, and a plurality of air holes 410 are evenly arranged on the diverter plate 400;

[0067] Each air shaft assembly 310 is respectively connected to each air hole 410 , and is specifically fixed on a port of each air hole 410 .

[0068] By providing the splitter plate 400 , on the one hand, the installation of each gas shaft assembly 310 is facilitated; on the other hand, it can ensure that the gas entering from the gas inlet 101 directly acts on each gas shaft assembly 310 to avoid gas leakage.

[0069] Embodiment 4:

[0070] This embodiment is a further improvement made on the basis of any of the above embodiments.

[0071] like Figure 1-Figure 3As shown, in this embodiment, the main frame 100 includes: a square frame 110, whose upper and lower ends are open; a conical cover 120, which is arranged on the upper port of the square frame 110, and the air inlet 101 is located on the conical cover 120;

[0072] The lower pressing plate 200 is disposed on the lower port of the square frame 110 .

[0073] It should be noted that the conical cover 120 is detachably disposed on the square frame 110. Specifically, screws are used to connect the conical cover 120 to the square frame 110 on all sides to facilitate the maintenance and replacement of various internal components.

[0074] In this embodiment, the square frame 110 is optimized to have a limiting groove 111, the outer edge of the diverter plate 400 is embedded in the limiting groove 111, and after the conical cover 120 is covered on the square frame 110, the conical cover 120 abuts against one end surface of the diverter plate 400 that is opposite to the limiting groove 111. Each air shaft assembly 310 is installed on the diverter plate 400, and then the diverter plate 400 is clamped on the square frame 110 to facilitate installation and removal.

[0075] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A cell shaping plate structure, characterized in that: include: A main frame (100), one end of which is provided with an air inlet (101); A lower pressing plate (200) movably disposed on the main frame (100); and a profiling and shaping mechanism (300), which is arranged in the main frame (100) and is used to drive the lower pressing plate (200) to move so as to shape the battery cell; The lower pressing plate (200) is made of a flexible material, and the profiling and shaping mechanism (300) is used to uniformly act the gas entering from the air inlet (101) on various positions of the lower pressing plate (200) so that the surface of the battery cell is subjected to uniform force.

2. The cell shaping plate structure according to claim 1, characterized in that: The profiling and shaping mechanism (300) comprises: The gas shaft assembly (310) has a plurality of groups and is evenly distributed in the main frame (100); The gas entering through the air inlet (101) causes each of the air shaft assemblies (310) to extend and act on the lower pressing plate (200), causing the lower pressing plate (200) to move.

3. The cell shaping plate structure according to claim 2, characterized in that: The air shaft assembly (310) comprises: Cylinder barrel (311); and an air shaft (312) which is slidably disposed in the cylinder (311) and has one end extending from the cylinder (311) and then extending in the direction of the lower pressing plate (200).

4. The cell shaping plate structure according to claim 3, characterized in that: The air shaft (312) is a T-shaped structure.

5. The cell shaping plate structure according to claim 2, characterized in that: The outer edge of the lower pressing plate (200) is a folded structure.

6. The cell shaping plate structure according to claim 2, characterized in that: The end surface of the lower pressing plate (200) in contact with the battery core has a polygonal texture.

7. The cell shaping plate structure according to any one of claims 2 to 6, characterized in that: A flow dividing plate (400) is arranged in the main frame (100), and a plurality of air holes (410) are evenly arranged on the flow dividing plate (400); Wherein, each of the air shaft components (310) is respectively connected to each of the air holes (410).

8. The cell shaping plate structure according to claim 7, characterized in that: The main frame (100) comprises: A square frame (110) having openings at its upper and lower ends; A conical cover (120) is arranged on the upper port of the square frame (110), and the air inlet (101) is located on the conical cover (120); Wherein, the lower pressing plate (200) is arranged on the lower port of the square frame (110).

9. The cell shaping plate structure according to claim 8, characterized in that: The conical cover (120) is detachably arranged on the square frame (110).

10. The cell shaping plate structure according to claim 9, characterized in that: A limiting groove (111) is provided on the square frame (110), and the outer edge of the diverter plate (400) is embedded in the limiting groove (111). After the conical cover (120) is covered on the square frame (110), the conical cover (120) abuts against an end surface of the diverter plate (400) that is opposite to the limiting groove (111).

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