Battery cover plate and battery

Abstract

The utility model provides a battery cover plate and a battery, and relates to the technical field of batteries, and the battery cover plate comprises a top cover, a top cover plate and a bottom cover plate, the upper insulating sheet is fixedly arranged on the upper surface of the top cover, the upper insulating sheet is provided with a connecting hole which is coaxial with the mounting hole, and the bottom surface of the upper insulating sheet is provided with an annular inserting part which is connected with the inner wall of the mounting hole; the upper pole is fixedly arranged on the top surface of the upper insulating sheet, and the lower part of the upper pole is positioned in the connecting hole; the upper end of the lower pole is inserted into the mounting hole and is welded with the upper pole, and the diameter of the upper pole is greater than that of the lower pole; and the sealing element is positioned between the lower pole and the top cover. According to the battery cover plate disclosed by the utility model, by adopting the design of the ultrathin upper insulating sheet and increasing the outer diameter of the upper pole, the heat exchange area and the heat dissipation efficiency of the pole are remarkably improved, the heat generated when current passes through can be quickly diffused, and the safety and the reliability of a battery are remarkably enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a battery. Background Art

[0002] As energy density requirements continue to increase, the design of battery top covers and poles is becoming thinner and thinner. Although this design has improved battery performance to a certain extent, it has also brought new challenges, especially safety issues caused by battery short circuits. When a lithium-ion battery short-circuits, the temperature of the pole will rise rapidly. Although conventional designs will set a fuse mechanism on the battery connector to automatically fuse and interrupt the current when the temperature is too high, thereby preventing further short circuits and thermal runaway. However, actual conditions show that before the fuse mechanism is activated, the temperature of the pole may have reached an extremely high level, and the sharp rise in the temperature of the pole will cause the sealing ring and upper plastic material in contact with it to melt. After the sealing ring and upper plastic melt, high-temperature gas and electrolyte may leak out from the inside of the battery, causing fire or explosion, thereby increasing safety risks. Therefore, effective heat dissipation of the pole is crucial to the safety and performance of the battery. Utility Model Content

[0003] In view of this, the utility model proposes a battery cover and a battery to improve the heat dissipation performance of the pole and enhance the safety and reliability of the battery.

[0004] The technical solution of the utility model is achieved in this way:

[0005] In one aspect, the utility model provides a battery cover, comprising:

[0006] A top cover, wherein a mounting hole is provided on the top cover;

[0007] An upper insulating sheet is fixedly arranged on the upper surface of the top cover, the upper insulating sheet has a connecting hole coaxially arranged with the mounting hole, and the bottom surface of the upper insulating sheet has an annular plug-in portion connected with the inner wall of the mounting hole;

[0008] An upper pole, fixedly arranged on the top surface of the upper insulating sheet, with the lower portion of the upper pole located in the connecting hole;

[0009] The lower pole, the upper end of which is inserted into the mounting hole and welded to the upper pole, and the diameter of the upper pole is larger than the diameter of the lower pole;

[0010] Seal, located between the lower pole and the top cover.

[0011] On the basis of the above technical solution, preferably, the lower pole includes a column and a disk fixedly arranged on the bottom surface of the column, the diameter of the disk is larger than the diameter of the column, the top surface of the column passes through the mounting hole and is welded to the bottom surface of the upper insulating sheet, the seal includes a first sealing part and a second sealing part, the first sealing part is sleeved on the outside of the column, the upper part of the first sealing part is located between the mounting hole and the column, and is abutted against the bottom end of the annular plug-in part, and the upper and lower surfaces of the second sealing part are respectively in contact with the bottom surface of the top cover and the top surface of the disk.

[0012] Further, preferably, a concave cavity is opened at the center of the bottom surface of the disk body, and the inner top surface of the concave cavity extends toward the upper part of the column.

[0013] On the basis of the above technical solution, preferably, a limiting step is provided on the inner wall of the connecting hole, the bottom surface of the upper pole is flush with the bottom surface of the limiting step, and the upper part of the column is inserted in the annular plug-in part and is flush with the bottom surface of the limiting step.

[0014] On the basis of the above technical solution, preferably, a plurality of reinforcing ribs are evenly arranged on the upper and lower surfaces of the top cover around the mounting hole.

[0015] Further, preferably, the reinforcing rib is wedge-shaped, and one end of the reinforcing rib close to the mounting hole gradually inclines toward the other end.

[0016] Furthermore, preferably, the cross section of the reinforcing rib is triangular.

[0017] On the basis of the above technical solution, preferably, a plurality of connection posts are vertically arranged on the upper insulating top surface, and a plurality of connection holes matched with the connection posts are opened on the upper pole.

[0018] Preferably, an isolation ring is further provided on the outer circumference of the upper insulating sheet, and the isolation ring surrounds the outer circumference of the upper pole.

[0019] In a second aspect, the utility model further discloses a battery, comprising the battery cover plate described in the first aspect.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] (1) The battery cover disclosed in the utility model significantly improves the heat exchange area and heat dissipation efficiency of the pole by adopting an ultra-thin upper insulating sheet design and increasing the outer diameter of the upper pole, ensuring that the heat generated when the current passes can be quickly dissipated. In addition, the larger contact area and the annular plug-in portion between the upper pole, the upper insulating sheet and the top cover provide better sealing and supporting strength, and combined with the seal between the lower pole and the top cover, it ensures that the gas or electrolyte inside the battery does not leak, thereby significantly enhancing the safety and reliability of the battery.

[0022] (2) By setting the concave cavity, the welding equipment can be extended into the concave cavity to weld the inner top surface of the concave cavity and the bottom surface of the upper pole, thereby reducing the welding penetration distance and the welding function, thereby preventing the sealing member and the upper insulating sheet from melting due to high temperature.

[0023] (3) By setting wedge-shaped reinforcement ribs on the upper and lower surfaces of the top cover, the wedge-shaped reinforcement ribs can better improve the strength in the height direction by using the wedge-shaped force-enhancing principle, which can improve the deformation from the inside to the outside and from the outside to the inside, thereby preventing leakage and external force extrusion deformation during high temperature and gas production. The setting of the reinforcement ribs can limit the upper insulation sheet and the seal at the same time and restrain their rotation.

[0024] (4) By setting the connecting column, a tight connection between the upper insulating sheet and the upper pole can be achieved, that is, the connection strength between the upper insulating sheet and the upper pole is improved, and the sealing between the upper pole and the upper insulating sheet is improved. At the same time, the setting of the connecting column can prevent the upper pole from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 This is a plan cross-sectional view of the first structural mode of the battery cover disclosed in the utility model;

[0027] Figure 2 This is a plan cross-sectional view of the second structural mode of the battery cover disclosed in the utility model;

[0028] Figure 3 This is a plan cross-sectional view of the third structural mode of the battery cover disclosed in the utility model;

[0029] Figure 4 This is a plan cross-sectional view of the fourth structural mode of the battery cover disclosed in the utility model;

[0030] Figure 5 A top view of a structural mode of a battery cover disclosed in the utility model;

[0031] Figure 6 A top view of another structural mode of the battery cover disclosed in the utility model;

[0032] Reference numerals:

[0033] 1. Top cover; 11. Mounting hole; 2. Upper insulating sheet; 21. Connecting hole; 22. Annular plug-in part; 3. Upper pole; 4. Lower pole; 5. Seal; 41. Column; 42. Disc; 51. First sealing part; 52. Second sealing part; 421. Concave cavity; 23. Limiting step; 12. Reinforcing rib; 24. Connecting column; 25. Isolation ring. DETAILED DESCRIPTION

[0034] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figure 1 As shown, the utility model discloses a battery cover plate, comprising a top cover 1, an upper insulating sheet 2, an upper pole 3, a lower pole 4 and a sealing member 5.

[0036] The top cover 1 is a plain aluminum plate, which provides overall mechanical support and protection for the entire battery cover. A mounting hole 11 is provided on the top cover 1 to provide a position basis for the installation and fixation of the pole.

[0037] The upper insulating sheet 2 is fixedly arranged on the upper surface of the top cover 1. The upper insulating sheet 2 has a connection hole 21 coaxially arranged with the mounting hole 11, and provides a fixed position for the pole through the connection hole 21. The bottom surface of the upper insulating sheet 2 has an annular plug-in portion 22 sealed with the inner wall of the mounting hole 11, which is used to establish electrical insulation between the pole through the upper insulating sheet 2 and the top cover 1. In this embodiment, the upper insulating sheet 2 is a thin sheet, which can reduce the thickness of the entire battery cover.

[0038] The upper pole 3 is fixedly arranged on the top surface of the upper insulating sheet 2, and the lower part of the upper pole 3 is located in the connecting hole 21; it is worth noting that the upper pole 3 covers the upper insulating sheet 2, and the heat exchange area of ​​the upper pole 3 can be increased by increasing the outer diameter of the upper pole 3. In addition, the outer diameters of the upper pole 3 and the upper insulating sheet 2 are both increased, so that the upper pole 3 and the upper insulating sheet 2 have a larger contact area to achieve better sealing and support strength, combined with the ultra-thin upper insulating sheet 2 design, to achieve a larger heat dissipation area and a shorter heat diffusion path between the upper pole 3 and the top cover 1.

[0039] The lower pole 4, whose upper end is inserted into the mounting hole 11 and welded to the upper pole 3, has a diameter greater than that of the lower pole 4; this arrangement can improve the current carrying capacity, and at the same time, the upper pole 3 provides a larger convection heat dissipation area, and the heat generated by the current from the lower pole 4 through the upper pole 3 can be efficiently dissipated through the upper pole 3 in time. In this embodiment, the upper pole 3 and the lower pole 4 are connected by welding.

[0040] The seal 5 is located between the lower pole 4 and the top cover 1. On the one hand, it establishes electrical isolation between the lower pole 4 and the top cover 1. On the other hand, it establishes a sealed connection between the lower pole 4 and the top cover 1 to prevent leakage of gas or electrolyte inside the battery and improve the safety of the battery.

[0041] The battery cover disclosed in the utility model adopts the ultra-thin upper insulating sheet 2 design and increases the outer diameter of the upper pole 3, which significantly improves the heat exchange area and heat dissipation efficiency of the pole, ensuring that the heat generated when the current passes can be quickly diffused. In addition, the larger contact area between the upper pole 3 and the upper insulating sheet 2 and the top cover 1 and the annular plug-in portion 22 provide better sealing and support strength, combined with the seal 5 between the lower pole 4 and the top cover 1, ensuring that the gas or electrolyte inside the battery does not leak, thereby significantly enhancing the safety and reliability of the battery.

[0042] As some preferred embodiments, the lower pole 4 includes a column 41 and a disk 42 fixedly arranged on the bottom surface of the column 41. The diameter of the disk 42 is larger than the diameter of the column 41. The top surface of the column 41 passes through the mounting hole 11 and is welded to the bottom surface of the upper insulating sheet 2. The bottom surface of the disk 42 is used to be welded to the pole ear inside the battery through the connecting sheet. The setting of the disk 42 is also used to make the seal 5 sealed between the lower pole 4 and the top cover 1. Secondly, the design of the disk 42 not only increases the mechanical strength, but also optimizes the heat conduction path through a larger contact area, improves the heat dissipation performance of the pole, and helps to timely dissipate the heat generated when the current passes through to prevent overheating.

[0043] The seal 5 includes a first seal portion 51 and a second seal portion 52. The first seal portion 51 is sleeved on the outside of the column 41. The upper portion of the first seal portion 51 is located between the mounting hole 11 and the column 41, and abuts against the bottom end of the annular plug portion 22, ensuring the sealing between the column 41 and the mounting hole 11, thereby effectively preventing the gas or electrolyte inside the battery from leaking through the gap between the column 41 and the mounting hole 11. The upper and lower surfaces of the second seal portion 52 are in contact with the bottom surface of the top cover 1 and the top surface of the disk 42, respectively, further enhancing the sealing between the disk 42 and the top cover 1. The above double sealing structure provides higher anti-leakage protection and improves the safety and reliability of the battery.

[0044] Since the upper pole 3 and the lower pole 4 have a certain thickness, the temperature is high during welding, which may easily cause the risk of melting of the seal 5 and the upper insulating sheet 2. Therefore, the solution adopted in this embodiment is: a concave cavity 421 is opened at the center of the bottom surface of the disk body 42, and the inner top surface of the concave cavity 421 extends toward the upper part of the column 41. Through the setting of the concave cavity 421, the welding head can be extended into the concave cavity 421, and the inner top surface of the concave cavity 421 and the bottom surface of the upper pole 3 are welded, which reduces the welding penetration distance and the welding function, thereby preventing the seal 5 and the upper insulating sheet 2 from melting due to high temperature.

[0045] Preferably, a limiting step 23 is provided on the inner peripheral wall of the connection hole 21, the bottom surface of the upper pole 3 is flush with the bottom surface of the limiting step 23, and the upper part of the column 41 is inserted into the annular plug-in portion 22 and is flush with the bottom surface of the limiting step 23. With the above technical solution, the limiting step 23 provides a clear installation position, so that the operator or automated equipment can quickly and accurately install the upper pole 3 and the lower pole 4, simplifying the installation process and improving production efficiency. Due to the existence of the limiting step 23, the flatness and consistency of the contact surface of the electrical connection part are ensured, and the reliability and conductive performance of the electrical contact are improved.

[0046] In addition, it is worth noting that due to the presence of the limiting step 23, the connection area between the upper pole 3 and the upper insulating sheet 2 is increased, and the connection area between the lower pole 4 and the upper insulating sheet 2 is also increased, thereby extending the leakage path of the electrolyte at the connection between the upper pole 3, the lower pole 4 and the upper insulating sheet 2, thereby improving the sealing.

[0047] In order to effectively fix the upper insulating sheet 2 and the top cover 1, and improve the sealing performance of the connection between the two, refer to the attached Figure 2-6 As shown, the solution adopted in this embodiment is to evenly arrange a plurality of reinforcing ribs 12 around the mounting hole 11 on the upper surface of the top cover 1. Thus, the upper insulating sheet 2 and the top cover 1 can be connected by injection molding. Due to the effect of the reinforcing ribs 12, the bonding strength between the upper insulating sheet 2 and the top cover 1 can be improved, and the upper insulation and the top cover 1 can be prevented from peeling off after the battery cover is subjected to external force, thereby improving the sealing between the upper insulating sheet 2 and the top cover 1.

[0048] In order to further improve the sealing between the lower pole 4 and the top cover 1, a plurality of reinforcing ribs 12 can be evenly arranged around the mounting hole 11 on the lower surface of the top cover 1, so that the reinforcing ribs 12 can squeeze the seal 5 in the thickness direction of the battery cover, so that the seal 5 can more firmly achieve the sealing between the lower pole 4 and the top cover 1.

[0049] As some embodiments, the reinforcing ribs 12 on the upper and lower surfaces of the top cover 1 can be arranged to correspond to each other, or can be arranged to not correspond to each other. Figure 2 and 3As shown, there are two different structures in which the reinforcing ribs 12 on the upper surface of the top cover 1 and the reinforcing ribs 12 on the lower surface of the top cover 1 are staggered up and down in the thickness direction of the top cover 1.

[0050] As some preferred embodiments, the reinforcing rib 12 is wedge-shaped, and one end of the reinforcing rib 12 close to the mounting hole 11 gradually tilts toward the other end. The wedge-shaped reinforcing rib 12 can better improve the strength in the height direction by using the wedge-shaped force-increasing principle, and can improve the deformation from the inside to the outside and from the outside to the inside, thereby preventing leakage and external force extrusion deformation during high temperature and gas production. The setting of the reinforcing rib 12 can simultaneously limit the upper insulating sheet 2 and the sealing member 5, and restrict their rotation.

[0051] In some embodiments, the reinforcing ribs 12 are strip-shaped convex ribs of equal width. In some other embodiments, the cross-section of the reinforcing ribs 12 is a triangular structure. The reinforcing ribs 12 arranged in a triangular structure can achieve a wedge-shaped force-enhancing effect in both the horizontal and height directions, thereby improving the connection strength between the upper insulating sheet 2 or the sealing member 5 and the top cover 1.

[0052] In order to achieve reliable connection between the upper pole 3 and the upper insulating sheet 2, in this embodiment, a plurality of connecting posts 24 are vertically arranged on the upper insulating top surface, and a plurality of connecting holes 21 adapted to the connecting posts 24 are opened on the upper pole 3. The upper pole 3, the upper insulation and the top cover 1 can be formed into an integral molding by injection molding process, so that a part of the upper insulating sheet 2 is tightly connected with the top cover 1 during the injection molding process, and the other part of the upper insulating sheet 2 flows into the connecting holes 21 during the plastic solution injection molding process to form the connecting posts 24, so that the upper insulating sheet 2 and the upper pole 3 are tightly connected, that is, the connection strength between the upper insulating sheet 2 and the upper pole 3 is improved, and the sealing between the upper pole 3 and the upper insulating sheet 2 is improved. At the same time, the setting of the connecting posts 24 can prevent the upper pole 3 from rotating.

[0053] Preferably, an isolation ring is further provided on the outer circumference of the upper insulating sheet 2, and the isolation ring surrounds the outer circumference of the upper pole 3. The isolation ring can electrically isolate the outer circumference of the upper pole 3 and the top cover 1 to avoid the risk of short circuit.

[0054] The utility model also discloses a battery, comprising the battery cover plate disclosed in the above embodiment.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: include: A top cover (1), wherein a mounting hole (11) is provided on the top cover (1); An upper insulating sheet (2) is fixedly arranged on the upper surface of the top cover (1), the upper insulating sheet (2) having a connection hole (21) coaxially arranged with the mounting hole (11), and a bottom surface of the upper insulating sheet (2) having an annular plug-in portion (22) sealedly connected to the inner wall of the mounting hole (11); An upper pole (3) is fixedly arranged on the top surface of the upper insulating sheet (2), and the lower part of the upper pole (3) is located in the connecting hole (21); A lower pole (4), the upper end of which is inserted into the mounting hole (11) and welded to the upper pole (3), and the diameter of the upper pole (3) is greater than the diameter of the lower pole (4); The sealing member (5) is located between the lower pole (4) and the top cover (1).

2. The battery cover according to claim 1, characterized in that: The lower pole (4) comprises a column (41) and a disk (42) fixedly arranged on the bottom surface of the column (41); the diameter of the disk (42) is larger than the diameter of the column (41); the top surface of the column (41) passes through the mounting hole (11) and is welded to the bottom surface of the upper insulating sheet (2); the sealing member (5) comprises a first sealing portion (51) and a second sealing portion (52); the first sealing portion (51) is sleeved on the outside of the column (41); the upper portion of the first sealing portion (51) is located between the mounting hole (11) and the column (41) and is abutted against the bottom end of the annular plug-in portion (22); the upper and lower surfaces of the second sealing portion (52) are in contact with the bottom surface of the top cover (1) and the top surface of the disk (42) respectively.

3. The battery cover as claimed in claim 2, characterized in that: A concave cavity (421) is provided at the center of the bottom surface of the disk body (42), and the inner top surface of the concave cavity (421) extends toward the upper part of the column (41).

4. The battery cover as claimed in claim 2, characterized in that: The inner wall of the connection hole (21) is provided with a limiting step (23), the bottom surface of the upper pole (3) is flush with the bottom surface of the limiting step (23), and the upper part of the column (41) is inserted into the annular plug-in portion (22) and is flush with the bottom surface of the limiting step (23).

5. The battery cover as claimed in claim 2, characterized in that: A plurality of reinforcing ribs (12) are evenly arranged on the upper and lower surfaces of the top cover (1) around the mounting hole (11).

6. The battery cover as claimed in claim 5, characterized in that: The reinforcing rib (12) is wedge-shaped, and one end of the reinforcing rib (12) close to the mounting hole (11) gradually inclines toward the other end.

7. The battery cover as claimed in claim 6, characterized in that: The cross section of the reinforcing rib (12) is triangular in shape.

8. The battery cover as claimed in claim 5, characterized in that: A plurality of connection columns (24) are vertically arranged on the upper insulating top surface, and a plurality of connection holes (21) adapted to the connection columns (24) are opened on the upper pole column (3).

9. The battery cover as claimed in claim 1, characterized in that: An isolation ring (25) is also provided on the outer circumference of the upper insulating sheet (2), and the isolation ring (25) surrounds the outer circumference of the upper pole (3).

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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