Battery cover plate assembly and power battery

Abstract

The utility model relates to the technical field of batteries, particularly provides a battery cover plate assembly and a power battery, and aims to solve the problem that a battery cell of an existing power battery is likely to fail due to the fact that a sealing nail falls into the battery cell. For this purpose, the battery cover plate assembly comprises: a cover plate body, which is provided with a liquid injection hole; the bearing structure is connected with the cover plate body, and the bearing structure is provided with a bearing part corresponding to the liquid injection hole; the sealing nail penetrates through the liquid injection hole and can abut against the bearing part. According to the battery cover plate, the bearing structure is arranged on the cover plate body, and in the operation process of the power battery, when the sealing nail is loosened relative to the cover plate body, the sealing nail cannot fall into the battery cell due to the blocking effect of the bearing structure, so that the possibility of battery cell failure caused by falling of the sealing nail can be reduced, and the stability and the safety of the battery are enhanced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and specifically provides a battery cover assembly and a power battery. Background Art

[0002] With the continuous development of the new energy industry, lithium batteries are increasingly being used in electronic equipment, electric vehicles and other fields.

[0003] In the production process of lithium batteries, after the electrolyte is injected into the battery cell through the injection hole on the shell, a sealing nail needs to be inserted into the injection hole to seal the injection hole. However, in the actual application of the battery, due to the influence of environmental factors such as external vibration, the sealing nail may fall into the battery cell, thereby squeezing the battery cell pole piece during the operation of the battery cell, causing the pole piece to be damaged and the battery cell to short-circuit, resulting in battery cell failure.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Utility Model Content

[0005] The present application aims to solve the above-mentioned technical problem, that is, to solve the problem that the existing power battery may fail due to the sealing nail falling into the battery cell.

[0006] In a first aspect, the present application provides a battery cover assembly, comprising:

[0007] A cover plate body, on which a liquid injection hole is provided;

[0008] A supporting structure connected to the cover body, wherein the supporting structure has a supporting portion corresponding to the injection hole;

[0009] A sealing pin passes through the injection hole and can abut against the supporting portion.

[0010] When the above technical solution is adopted, during the operation of the battery, the sealing nail will not fall into the battery cell due to the blocking effect of the supporting structure, thereby reducing the possibility of battery cell failure caused by the falling of the sealing nail and enhancing the stability and safety of the battery.

[0011] In a technical solution of the above-mentioned battery cover assembly, the supporting structure includes a cylindrical component connected to the cover body, the supporting portion is connected to the end of the cylindrical component away from the cover body, and the cylindrical component and the supporting portion define an accommodating space for accommodating the sealing nail;

[0012] The supporting portion is provided with a first through hole for electrolyte to pass through.

[0013] In the case of adopting the above technical solution, the present application provides a specific method of supporting structure.

[0014] In a technical solution of the above-mentioned battery cover assembly, the axis of the first through hole coincides with the axis of the injection hole, and the aperture of the first through hole is located between the diameter of the large diameter end of the sealing nail and the diameter of the small diameter end of the sealing nail.

[0015] In the case of adopting the above technical solution, during the installation of the sealing nail, when the sealing nail is inserted too deeply into the injection hole, the small diameter end of the sealing nail can partially extend into the first through hole, thereby preventing the supporting part from being damaged due to the sealing nail being inserted too deeply, and further preventing the fragments generated by the damage of the supporting part from entering the battery cell, thereby improving the safety and stability of the battery. On the other hand, the first through hole can also limit the radial displacement of the small diameter end of the sealing nail, and the small diameter end of the sealing nail is stuck in the first through hole, thereby also improving the loosening problem of the sealing nail to a certain extent.

[0016] In a technical solution of the above-mentioned battery cover assembly, the supporting portion is further provided with a plurality of second through holes arranged around the first through holes.

[0017] When the above technical solution is adopted, the second through hole can reduce the resistance of the supporting part to the electrolyte, which is beneficial to the injection of the electrolyte. Moreover, the second through hole cooperates with the first through hole 221 to form multiple channels for electrolyte injection on the supporting part, which can avoid excessive fluid pressure and alleviate the impact of the electrolyte on the battery cell.

[0018] In a technical solution of the above-mentioned battery cover assembly, the cylindrical component is further provided with a third through hole for allowing electrolyte to pass through.

[0019] When the above technical solution is adopted, the electrolyte can enter the battery cell laterally through the third through hole, which increases the injection path of the electrolyte, thereby further alleviating the impact of the electrolyte on the fixed part of the battery cell.

[0020] In a technical solution of the above-mentioned battery cover assembly, the axis of the first through hole coincides with the axis of the injection hole, and the supporting part is also circumferentially provided with a plurality of fourth through holes connected to the first through holes, and the fourth through holes separate the supporting part into a plurality of independent petals.

[0021] When the above technical solution is adopted, when the sealing pin is inserted too deeply into the injection hole, the multiple independent petals of the supporting part can bend downward and deform, reducing the possibility of the supporting part breaking. At the same time, the multiple independent petals will also exert radial pressure on the sealing pin to limit the radial displacement of the sealing pin.

[0022] In a technical solution of the above-mentioned battery cover assembly, the supporting portion is a mesh structure.

[0023] When the above technical solution is adopted, the mesh structure can not only block the sealing nails, but also alleviate the impact of the electrolyte on the battery cell.

[0024] In a technical solution of the above-mentioned battery cover assembly, the battery cover assembly further includes a reinforcing plate, and the reinforcing plate is connected to a surface of the cover body facing away from the supporting structure.

[0025] When the above technical solution is adopted, the overall structural strength of the battery cover assembly can be enhanced.

[0026] In a technical solution of the above-mentioned battery cover assembly, a countersunk hole connected to the injection hole is opened on the reinforcing plate, and a sealing plate is arranged in the countersunk hole to fix the sealing nail in the injection hole.

[0027] When the above technical solution is adopted, the sealing pin can be prevented from slipping out of the liquid injection hole due to loosening.

[0028] In a second aspect, the present application provides a power battery, comprising the battery cover assembly described in any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0030] Figure 1 is a front view of a battery cover assembly according to an embodiment of the present application;

[0031] Figure 2 is along Figure 1 Sectional view along line AA;

[0032] Figure 3 yes Figure 1 Schematic diagram when looking up;

[0033] Figure 4 yes Figure 3 A partial enlarged view of part A;

[0034] Figure 5 It is a front view of a supporting portion according to another embodiment of the present application.

[0035] In the figures, the reference numerals refer to the following:

[0036] 1. Cover plate body; 11. Liquid injection hole; 2. Support structure; 21. Cylindrical component; 211. Third through hole; 22. Support part; 221. First through hole; 222. Second through hole; 223. Fourth through hole; 3. Sealing pin; 4. Reinforcement plate; 41. Countersunk hole; 42. Sealing plate. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0038] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it 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. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Reference Figure 1 and Figure 2 , is a battery cover assembly according to an embodiment of the present application, which includes a cover body 1, a supporting structure 2, a sealing nail 3 and a reinforcing plate 4.

[0041] The cover body 1 can be a plastic part as a whole, and an injection hole 11 for injecting electrolyte is provided on the cover body 1. For the convenience of expression, the side surface of the cover body 1 facing the inside of the battery cell is called the inner surface, and the side surface opposite to the inner surface is called the outer surface. The supporting structure 2 is fixedly connected to the inner surface of the cover body 1. In some embodiments of the present application, the supporting structure 2 can be integrally formed with the cover body 1. The reinforcing plate 4 is fixedly connected to the outer surface of the cover body 1, that is, the surface facing away from the supporting structure 2. The reinforcing plate 4 can be made of metal material. The main function of the reinforcing plate 4 is to enhance the structural strength of the entire battery cover assembly.

[0042] Reference Figure 2, a countersunk hole 41 connected to the injection hole 11 is provided on the reinforcing plate 4, and the sealing pin 3 passes through the countersunk hole 41 and the injection hole 11 in sequence. Optionally, a sealing plate 42 is further provided in the countersunk hole 41, and the sealing plate 42 can be a metal plate. After the sealing pin 3 is inserted into the injection hole 11, the sealing plate 42 is installed in the countersunk hole 41, and the sealing plate 42 can be fixedly connected to the reinforcing plate 4 by welding, so as to fix the sealing pin 3 in the injection hole 11 and prevent the sealing pin 3 from loosening.

[0043] The sealing nail 3 can be made of plastic material as a whole, so that the sealing nail 3 can be interference fit with the injection hole 11, forming an extrusion force between the sealing nail 3 and the injection hole 11 to increase the sealing performance. Optionally, in order to facilitate the insertion of the sealing nail 3 into the injection hole 11, the cross-sectional area of ​​the sealing nail 3 gradually decreases toward the inside of the battery cell.

[0044] In one embodiment of the present application, the supporting structure 2 includes a cylindrical component 21 and a supporting portion 22. The cylindrical component 21 is fixedly connected to the inner surface of the cover body 1, and the supporting portion 22 is connected to the end of the cylindrical component 21 away from the cover body 1. The cylindrical component 21 and the supporting portion 22 both correspond to the injection hole 11, so that a accommodating space for accommodating the sealing nail 3 is defined between the cylindrical component 21 and the supporting portion 22. The sealing nail 3 extends into the accommodating space and can abut against the supporting portion 22. It should be noted that in actual applications, the positional relationship between the sealing nail 3 and the supporting structure 2 can be set so that when the sealing nail 3 is installed in the injection hole 11, there is a gap between the sealing nail 3 and the supporting portion 22. When the sealing nail 3 is loose, the sealing nail 3 can abut against the supporting portion 22 to prevent the sealing nail 3 from falling into the battery cell. Of course, the positional relationship between the sealing pin 3 and the supporting structure 2 can also be set so that when the sealing pin 3 is installed in the injection hole 11, the sealing pin 3 just abuts against the supporting part 22. At this time, the height of the supporting structure 2 is the smallest, thereby minimizing the space occupied by the supporting structure 2 inside the battery cell.

[0045] The supporting part 22 may be a plate-shaped component, and a first through hole 221 for electrolyte to pass through is formed on the supporting part 22. Before the sealing nail 3 is installed, the electrolyte passes through the injection hole 11 and the first through hole 221 in sequence to enter the battery cell.

[0046] It should also be noted that, although in the above-mentioned embodiments of the present application, the cylindrical component 21 is used as an exemplary connection bridge between the supporting portion 22 and the cover body 1, it does not constitute a limitation to the present application. For example, in some other implementations, the cylindrical component 21 can also be a plurality of connecting rods, or the supporting portion 22 itself is a flexible mesh, which is directly connected to the cover body 1.

[0047] As mentioned above, the present application sets a supporting structure 2 on the cover body 1. During the operation of the power battery, when the sealing nail 3 is loosened relative to the cover body 1, it is blocked by the supporting structure 2 and will not fall into the battery cell. This can reduce the possibility of battery cell failure caused by the falling of the sealing nail 3 and enhance the stability of the battery.

[0048] Reference Figure 2 , Figure 3 and Figure 4 As a possible implementation of the present application, the axis of the first through hole 221 coincides with the axis of the injection hole 11, and the aperture of the first through hole 221 is between the diameter of the large diameter end of the sealing nail 3 and the diameter of the small diameter end of the sealing nail 3. In this way, during the installation of the sealing nail 3, when the sealing nail 3 is inserted too deeply into the injection hole 11, the small diameter end of the sealing nail 3 can partially extend into the first through hole 221, thereby preventing the supporting part 22 from being damaged due to the sealing nail 3 being inserted too deeply, and further preventing the debris generated by the damage of the supporting part 22 from entering the battery cell, thereby improving the safety and stability of the battery.

[0049] In some embodiments of the present application, the size relationship between the supporting structure 2 and the sealing pin 3 can be set so that when the sealing pin 3 is exactly located in the injection hole 11 (i.e., the end face of the large diameter end of the sealing pin 3 is flush with the step of the countersunk hole 41), the small diameter end of the sealing pin 3 extends into the first through hole 221. In this way, during the operation of the battery, when affected by external environmental factors such as vibration, the first through hole 221 can not only limit the axial displacement of the sealing pin 3 and prevent the sealing pin 3 from falling into the battery cell, but also the first through hole 221 can limit the radial displacement of the small diameter end of the sealing pin 3, and the small diameter end of the sealing pin 3 is stuck in the first through hole 221, thereby improving the loosening problem of the sealing pin 3 to a certain extent. On the other hand, the small diameter end of the sealing pin 3 extends into the first through hole 221, which can minimize the size of the supporting structure 2 along the axial direction of the sealing pin 3, thereby avoiding the supporting structure 2 from occupying too much internal space of the battery.

[0050] Reference Figure 4 As an implementation of the present application, a plurality of second through holes 222 are also provided on the supporting portion 22 around the first through hole 221. Through the provision of the second through holes 222, the electrolyte can enter the battery cell through the second through holes 222, thereby reducing the resistance of the supporting portion 22 to the electrolyte, which is beneficial to the injection of the electrolyte. On the other hand, since the sealing nail 3 corresponds to the first through hole 221, the provision of the second through hole 222 can prevent residual electrolyte in the supporting structure 2. In addition, the second through hole 222 cooperates with the first through hole 221, so that a plurality of channels for electrolyte injection are formed on the supporting portion 22, which can avoid excessive fluid pressure and alleviate the impact of the electrolyte on the battery cell.

[0051] Furthermore, a third through hole 211 is also provided on the cylindrical component 21. In this way, during the injection of the electrolyte, the electrolyte can also enter the battery cell laterally through the third through hole 211, increasing the injection path of the electrolyte, thereby further alleviating the impact of the electrolyte on the fixed part of the battery cell. Optionally, a plurality of third through holes 211 can be provided at intervals along the circumference of the cylindrical component 21, or only at a specific position. In practical applications, adaptive adjustments can be made according to needs, and this application does not impose any restrictions on this.

[0052] Reference Figure 5 As another embodiment of the present application, the difference between the above embodiment and the above embodiment is that, in addition to the first through hole 221, the supporting part 22 is also provided with a plurality of fourth through holes 223 along the circumferential direction, and the cross section of the fourth through hole 223 extends along the radial direction of the supporting part 22. Specifically, one end of the fourth through hole 223 is connected to the first through hole 221, and the other end extends to the inner wall of the tubular part 21, so that the fourth through hole 223 divides the supporting part 22 into a plurality of independent petals. In this way, both the first through hole 221 and the fourth through hole 223 can allow electrolyte to pass through, and when the sealing nail 3 is inserted too deeply into the injection hole 11, the plurality of independent petals of the supporting part 22 can bend downward and deform, reducing the possibility of the supporting part 22 being broken, and at the same time, the plurality of independent petals will also exert radial pressure on the sealing nail 3, limiting the radial displacement of the sealing nail 3.

[0053] In some implementations of the present application, the supporting portion 22 may also be a mesh structure, which can prevent the sealing pin 3 from falling and alleviate the impact of the electrolyte on the battery cell.

[0054] In some other implementations of the present application, the supporting structure 2 as a whole can be a conical cylindrical structure, and its cross-sectional area gradually decreases toward the direction of the battery cell. The diameter of the small diameter end of the conical cylindrical structure is smaller than the diameter of the large diameter end of the sealing nail 3, that is, the diameter of the small diameter end of the conical cylindrical structure can be between the diameter of the large diameter end of the sealing nail 3 and the diameter of the small diameter end of the sealing nail 3. The diameter of the small diameter end of the conical cylindrical structure can also be smaller than the diameter of the small diameter end of the sealing nail 3. The present application does not impose any restrictions on this, as long as the sealing nail 3 can be prevented from falling into the battery cell. It can be understood that when the supporting structure 2 is a conical cylindrical structure as a whole, the inner wall of the supporting structure 2 is the above-mentioned supporting portion. In one embodiment, in order to limit the falling of the sealing nail 3 and reduce the impact of the electrolyte on the battery cell, a plurality of through holes can be opened on the side wall of the conical cylindrical structure to allow the electrolyte to pass through.

[0055] The present application also discloses a power battery, which includes an outer shell, a battery cover assembly in any of the above embodiments, and a battery cell. The battery cell is arranged in the outer shell, and the battery cover assembly is arranged at the open end of the outer shell to seal the battery cell in the outer shell.

[0056] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate body, on which a liquid injection hole is provided; A supporting structure connected to the cover body, wherein the supporting structure has a supporting portion corresponding to the injection hole; A sealing pin passes through the injection hole and can abut against the supporting portion.

2. The battery cover assembly according to claim 1, characterized in that: The supporting structure comprises a cylindrical component connected to the cover body, the supporting portion is connected to the end of the cylindrical component away from the cover body, and the cylindrical component and the supporting portion define an accommodating space for accommodating the sealing nail; The supporting portion is provided with a first through hole for electrolyte to pass through.

3. The battery cover assembly according to claim 2, characterized in that: The axis of the first through hole coincides with the axis of the injection hole, and the aperture of the first through hole is between the diameter of the large diameter end of the sealing pin and the diameter of the small diameter end of the sealing pin.

4. The battery cover assembly according to claim 3, characterized in that: The supporting portion is also provided with a plurality of second through holes arranged around the first through hole.

5. The battery cover assembly according to claim 2, characterized in that: The cylindrical component is also provided with a third through hole for allowing electrolyte to pass through.

6. The battery cover assembly according to claim 2, characterized in that: The axis of the first through hole coincides with the axis of the injection hole. The supporting portion is also provided with a plurality of fourth through holes in circumferential direction and connected with the first through hole. The fourth through holes separate the supporting portion into a plurality of independent petals.

7. The battery cover assembly according to claim 1, characterized in that: The supporting part is a mesh structure.

8. The battery cover assembly according to any one of claims 1 to 7, characterized in that: The battery cover assembly also includes a reinforcing plate connected to a surface of the cover body facing away from the supporting structure.

9. The battery cover assembly according to claim 8, characterized in that: The reinforcing plate is provided with a countersunk hole connected with the injection hole, and a sealing plate is arranged in the countersunk hole to fix the sealing nail in the injection hole.

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

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