Lithium battery cover plate and lithium battery

Abstract

The utility model belongs to the technical field of lithium battery processing, and particularly discloses a lithium battery cover plate which comprises a cover plate body, lower plastic connected to the lower end of the cover plate body, liquid injection holes formed in the cover plate body and the lower plastic, an anti-explosion valve connected to the interior of the cover plate body and an exhaust groove formed in the lower plastic. One side of the cover plate and one side of the lower plastic cement are respectively connected with two electrode parts, and the two electrode parts penetrate through the cover plate and are connected with the lower plastic cement; the latticed reinforcing strips provide a high strength / weight ratio, and the overall bending resistance and rigidity of the cover plate can be remarkably enhanced. The latticed stiffeners utilize geometric distribution to disperse stress, so that when the cover plate is subjected to external force (such as impact, compression or bending), the force can be more uniformly distributed to the ribs and surrounding areas, and the design provides similar or higher structural strength under the condition that the weight is not increased or reduced, so that the cover plate has the advantages of being simple in structure and low in cost. And especially, the performance is better when bearing local pressure or vibration.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery processing, in particular to a lithium battery cover plate and a lithium battery. BACKGROUND

[0002] The lithium battery cover plate is an important component in a lithium battery assembly, usually located at the top or bottom of the battery, and serves to protect the internal structure of the battery and provide sealing for the battery.

[0003] The existing lithium battery cover plate usually adopts a combination of a plate body and a lower plastic, for example, the utility model patent with the publication number CN218769800U discloses a lithium battery cover plate and a lithium battery, which adopts a combination of a substrate and a lower plastic. Although the lithium battery cover plate can protect the internal structure of the battery when being packaged at the top of the lithium battery shell, the lithium battery cover plate is prone to deformation or damage when subjected to external impact due to defects in the structural design of the lithium battery cover plate, which affects the safety of the battery. In particular, in a high-impact environment such as an electric vehicle, the insufficient strength of the cover plate may cause the cover plate to deform or break, thereby affecting the safety of the internal structure of the battery. UTILITY MODEL CONTENT

[0004] The purpose of the present application is to provide a lithium battery cover plate and a lithium battery to solve the technical problems raised in the background.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a lithium battery cover plate, comprising a cover plate, a lower plastic connected to the lower end of the cover plate, a liquid injection hole opened in the inside of the cover plate and the lower plastic, an explosion-proof valve connected to the inside of the cover plate, an exhaust groove opened in the inside of the lower plastic,

[0006] The side of the cover plate and the side of the lower plastic are respectively connected with two electrode parts, and the two electrode parts are connected through the cover plate and the lower plastic;

[0007] The lower end of the cover plate is provided with a cavity, and a plurality of grid-shaped reinforcing strips are integrally formed on the inner wall of the cavity. A bottom plate is further arranged in the inside of the cavity, and one side of the bottom plate is attached to one side of the grid-shaped reinforcing strips. Screw grooves are opened in the inside of the bottom plate and the inner wall of the cavity, and connecting bolts for connecting the bottom plate and the cover plate are screwed in the screw grooves.

[0008] In one embodiment, a buffer ring one is fixedly connected to the outer surface of the cover plate.

[0009] In one embodiment, an extension flange is integrally formed on one side of the cover plate, and a plurality of reinforcing ribs connected to one side of the cover plate are integrally formed on the inner wall of the extension flange. The bottom plate and the lower plastic are located in the inside of the extension flange.

[0010] In one embodiment, the outer surface of the extended flange is fixed with a second buffer ring and a sealing strip, and the two sides of the sealing strip are respectively attached to one side of the cover plate and one side of the second buffer ring.

[0011] In one embodiment, two recesses are formed on one side of the cover plate, the electrode part connected to one side of the cover plate includes two insulating plastics respectively placed in the two recesses, two upper electrode columns respectively connected to one side of the two insulating plastics, and two groups of positioning columns integrally formed on one side of the two upper electrode columns, and the interior of the cover plate and the insulating plastics is provided with positioning grooves for accommodating the positioning columns, and the positioning grooves in the interior of the cover plate are connected with the recesses.

[0012] In one embodiment, the electrode part connected to one side of the lower plastic includes two lower electrode columns, two connecting columns respectively fixed on one side of the two lower electrode columns, and two sealing rings respectively sleeved on the outer part of the two connecting columns, and the two sides of the two sealing rings are respectively attached to the lower electrode columns and the lower plastic, the interior of the insulating plastic, the cover plate and the lower plastic are respectively provided with two through holes, and the interior of the two upper electrode columns are respectively provided with connecting holes, and the two connecting columns respectively pass through the two through holes and are connected in the two connecting holes.

[0013] In one embodiment, a sealing pin is inserted into the liquid injection hole in the interior of the cover plate, and an avoiding groove is formed in the interior of the bottom plate.

[0014] A lithium battery includes the cover plate of the lithium battery.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] In the prior art, the strength of the solid cover plate completely depends on the inherent properties of the material (such as yield strength, hardness, etc.), when the thickness increases, the weight increases, but the strength improvement is relatively limited, the application forms a cavity in the interior of the cover plate, and a grid-shaped reinforcing strip is arranged on the inner wall of the cavity, the grid-shaped reinforcing strip provides a high strength / weight ratio, which can significantly enhance the overall bending resistance and rigidity of the cover plate. The grid-shaped reinforcing strip disperses stress through geometric distribution, so that when the cover plate is subjected to external force (such as impact, compression or bending), the force can be more evenly distributed to the ribs and the surrounding area, this design provides similar or higher structural strength without increasing the weight or reducing the weight, especially when subjected to local pressure or vibration, and the grid-shaped reinforcing strip can disperse the impact force to a larger area or multiple nodes, thereby reducing damage caused by stress concentration in a certain area. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the application;

[0018] Figure 2The pole structure schematic diagram of the application;

[0019] Figure 3 The part explosion diagram of the application;

[0020] Figure 4 The cavity and grid-shaped reinforcing bar structure schematic diagram of the application;

[0021] Figure 5 The structure schematic diagram of the bottom plate fixed in the cavity of the application.

[0022] In the figure: 1, cover plate; 2, explosion-proof valve; 3, sealing nail; 4, upper pole; 41, connecting hole; 42, positioning column; 43, positioning groove; 5, insulating plastic; 6, lower plastic; 7, liquid injection hole; 8, exhaust groove; 9, lower pole; 91, connecting column; 92, sealing ring; 10, extension flange; 11, buffer ring I; 12, buffer ring II; 13, sealing strip; 14, reinforcing rib; 15, groove; 16, through hole; 17, bottom plate; 18, avoidance groove; 19, screw groove; 20, cavity; 21, grid-shaped reinforcing bar; 22, connecting bolt. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0024] In the description of the application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do 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 on the application.

[0025] Embodiment:

[0026] Please refer to Figures 1-5The application provides a technical scheme: a lithium battery cover plate 1, which comprises the cover plate 1, a lower plastic 6 connected to the lower end of the cover plate 1, a liquid injection hole 7 formed in the cover plate 1 and the lower plastic 6, a sealing nail 3 inserted into the liquid injection hole 7 in the cover plate 1, the liquid injection hole 7 is mainly used for injecting electrolyte into the inside of the battery cell after the cover plate 1 is welded with the lithium battery shell, then the sealing nail 3 is sealed by laser welding, an explosion-proof valve 2 connected to the inside of the cover plate 1, when the internal pressure of the battery increases and exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve will break at the notch and open to release pressure, which is a mature prior art and will not be described here, and an exhaust groove 8 formed in the lower plastic 6, the battery internal gas passes through the exhaust groove 8 to open the explosion-proof valve 2 and release pressure,

[0027] A cavity 20 is formed in the lower end of the cover plate 1, and a plurality of grid-shaped reinforcing strips 21 are integrally formed on the inner wall of the cavity 20, the grid-shaped reinforcing strips 21 provide high strength / weight ratio, and can significantly enhance the overall bending resistance and rigidity of the cover plate 1. The grid-shaped reinforcing strips 21 disperse stress by geometric distribution, so that the force can be more evenly distributed to the ribs and the surrounding area when the cover plate 1 is subjected to external force (such as impact, compression or bending). This design provides similar or higher structural strength without increasing or reducing weight, especially when subjected to local pressure or vibration. At the same time, the grid-shaped reinforcing strips 21 can disperse impact force to a larger area or multiple nodes, thereby reducing damage caused by stress concentration in a certain area. A bottom plate 17 is further arranged in the cavity 20, and one side of the bottom plate 17 is attached to one side of the grid-shaped reinforcing strips 21. The bottom plate 17 is used to avoid direct contact between the grid-shaped reinforcing strips 21 and the lower plastic 6. An avoidance groove 18 is formed in the inside of the bottom plate 17. The avoidance groove 18 is used for the part of the protruding part in the cavity 20 to pass through the bottom plate 17 and directly contact the lower plastic 6. Screw grooves 19 are formed in the inside of the bottom plate 17 and the inner wall of the cavity 20, and connecting bolts 22 for connecting the bottom plate 17 and the cover plate 1 are screwed in the screw grooves 19.

[0028] A buffer ring one 11 is bonded to the outer surface of the cover plate 1, which can protect the cover plate 1 and improve the impact resistance of the cover plate 1.

[0029] An extension flange 10 is integrally formed on one side of the cover plate 1, and a plurality of reinforcing ribs 14 connected to one side of the cover plate 1 are integrally formed on the inner wall of the extension flange 10. The bottom plate 17 and the lower plastic 6 are located in the inside of the extension flange 10. The extension flange 10 can be inserted into the inside of the lithium battery shell and contact the inner wall of the lithium battery shell, which can increase the contact area between the cover plate 1 and the lithium battery shell, thereby improving the impact resistance of the cover plate 1.

[0030] The outer surface of the extension flange 10 is fixed with a buffer ring 12 and a sealing strip 13, and the two sides of the sealing strip 13 are respectively attached to one side of the cover plate 1 and one side of the buffer ring 12. When the extension flange 10 is inserted into the lithium battery shell, the outer surface of the buffer ring 12 can be in contact with the inner wall of the lithium battery shell, and the buffer ring 12 can play a buffering role to protect the extension flange 10 and improve the impact resistance. The sealing strip 13 can seal the gap between the cover plate 1 and the lithium battery shell.

[0031] Two electrode parts are respectively connected to one side of the cover plate 1 and one side of the lower plastic 6, and the two electrode parts are connected through the cover plate 1 and the lower plastic 6. Two grooves 15 are formed in one side of the cover plate 1. The electrode part connected to one side of the cover plate 1 includes two insulating plastics 5 respectively placed in the two grooves 15, two upper pole columns 4 respectively connected to one side of the two insulating plastics 5, and two groups of positioning columns 42 integrally formed on one side of the two upper pole columns 4. Positioning grooves 43 for accommodating the positioning columns 42 are formed in the cover plate 1 and the insulating plastic 5. The positioning columns 42 are inserted into the positioning grooves 43 to prevent the upper pole columns 4 from rotating. The positioning grooves 43 in the cover plate 1 are in communication with the grooves 15.

[0032] The electrode part connected to one side of the lower plastic 6 includes two lower pole columns 9, two connecting columns 91 respectively fixed to one side of the two lower pole columns 9, and two sealing rings 92 respectively sleeved on the outer part of the two connecting columns 91. The two sides of the two sealing rings 92 are respectively attached to the lower pole columns 9 and the lower plastic 6. Two through holes 16 are formed in the insulating plastic 5, the cover plate 1 and the lower plastic 6. Two connecting holes 41 are formed in the two upper pole columns 4. The two connecting columns 91 pass through the two through holes 16 and are connected in the two connecting holes 41. The upper pole columns 4 and the lower pole columns 9 mainly play a role of current conduction. Generally, the positive pole adopts an aluminum pole column, and the negative pole adopts a copper-aluminum composite pole column.

[0033] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0034] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary and that changes can be made in detail without departing from the principles and spirit of the application. The scope of the application is therefore defined by the appended claims and their equivalents.

Claims

1. A lithium battery cover plate, comprising a cover plate (1), a lower plastic (6) connected to the lower end of the cover plate (1), a liquid injection hole (7) opened in the cover plate (1) and the lower plastic (6), an explosion-proof valve (2) connected to the inside of the cover plate (1), and an exhaust groove (8) opened in the lower plastic (6), characterized in that: two electrode parts are respectively connected to one side of the cover plate (1) and one side of the lower plastic (6), and the two electrode parts are connected through the cover plate (1) and the lower plastic (6); a cavity (20) is opened at the lower end of the cover plate (1), a plurality of grid-shaped reinforcing strips (21) are integrally formed on the inner wall of the cavity (20), a bottom plate (17) is further arranged in the cavity (20), one side of the bottom plate (17) is attached to one side of the grid-shaped reinforcing strips (21), screw grooves (19) are opened in the inside of the bottom plate (17) and the inner wall of the cavity (20), and connecting bolts (22) for connecting the bottom plate (17) and the cover plate (1) are screwed in the screw grooves (19).

2. The lithium battery cover plate of claim 1, wherein: A buffer ring I (11) is fixedly connected to the outer surface of the cover plate (1).

3. The cover plate for a lithium battery of claim 2, wherein: An extension flange (10) is integrally formed on one side of the cover plate (1), a plurality of reinforcing ribs (14) connected to one side of the cover plate (1) are integrally formed on the inner wall of the extension flange (10), and the bottom plate (17) and the lower plastic (6) are located in the inside of the extension flange (10).

4. The lithium battery cover plate of claim 3, wherein: A buffer ring II (12) and a sealing strip (13) are fixedly connected to the outer surface of the extension flange (10), and the two sides of the sealing strip (13) are attached to one side of the cover plate (1) and one side of the buffer ring II (12), respectively.

5. The cover plate for a lithium battery of claim 4, wherein: Two recesses (15) are opened on one side of the cover plate (1), the electrode part connected to one side of the cover plate (1) comprises two insulating plastics (5) respectively placed in the two recesses (15), two upper pole columns (4) respectively connected to one side of the two insulating plastics (5), and two groups of positioning columns (42) integrally formed on one side of the two upper pole columns (4), and the inside of the cover plate (1) and the insulating plastic (5) is provided with positioning grooves (43) for accommodating the positioning columns (42), and the positioning grooves (43) in the inside of the cover plate (1) are communicated with the recesses (15).

6. The cover plate for a lithium battery of claim 5, wherein: The electrode part connected to one side of the lower plastic (6) comprises two lower pole columns (9), two connecting columns (91) fixedly connected to one side of the two lower pole columns (9), and two sealing rings (92) respectively sleeved on the outside of the two connecting columns (91), and the two sides of the two sealing rings (92) are respectively attached to the lower pole column (9) and the lower plastic (6), and two through holes (16) are opened in the inside of the insulating plastic (5), the cover plate (1) and the lower plastic (6), and two connecting holes (41) are opened in the inside of the two upper pole columns (4), and the two connecting columns (91) pass through the two through holes (16) and are connected in the two connecting holes (41), respectively.

7. The lithium battery cover plate of claim 6, wherein: A sealing pin (3) is inserted in the liquid injection hole (7) in the inside of the cover plate (1), and an avoiding groove (18) is opened in the inside of the bottom plate (17).

8. A lithium battery, characterized by: The lithium battery cover plate (1) of any one of claims 1-7 is included.

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