Pole structure with liquid injection hole and battery cell

Abstract

The utility model discloses a pole structure with a liquid injection hole and a battery cell, the pole structure comprises a cover plate, a pole, a connecting piece and a sealing assembly, the cover plate is provided with a pole mounting hole, the pole is arranged on the upper surface of the cover plate, the pole and the pole mounting hole are coaxial, the connecting piece is arranged on the cover plate, and the sealing assembly is arranged on the connecting piece. The connecting piece sequentially penetrates through the pole mounting hole and the pole from the lower surface of the cover plate to enable the pole to be fixedly connected with the cover plate, a liquid injection hole penetrating through the whole connecting piece in the axial direction of the connecting piece is formed in the center of the connecting piece, and the sealing assembly is arranged on the side, close to the pole, of the liquid injection hole. And sealing the liquid injection hole after liquid injection. The utility model solves the technical problems that the electrolyte is easy to overflow and the sealing glue nail is easy to be pushed into the battery core to influence the performance of the battery because the liquid injection hole is designed on the cover plate in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole structure with a liquid injection hole and a battery core. Background Art

[0002] The pole and the injection hole are two important components of the battery cell. In the current battery cell production process, the pole and the injection hole are generally designed at different positions on the cover plate. The pole is used to connect the electrodes of the two battery cells, and the injection hole is used to inject electrolyte into the battery cell, such as the "battery injection hole structure" disclosed in the Chinese utility model patent with the authorization number CN219303916U. However, in the above-mentioned conventional structure in which the injection hole is designed on the cover plate, due to the limited thickness of the cover plate, when injecting liquid, the injection nozzle of the injection machine and the injection hole will be shallow, and even the injection nozzle can only inject liquid on the horizontal plane of the injection hole, causing the electrolyte to overflow easily; in addition, due to the limited thickness of the cover plate, the depth of the injection hole is shallow, which in turn causes the sealing nail used to seal the injection hole to be easily pushed into the battery cell due to excessive force, causing foreign matter to enter the battery cell and affect the battery performance. Utility Model Content

[0003] In view of this, the utility model provides a pole structure and a battery cell with an injection hole. The injection hole is designed on the pole, which solves the technical problems of the existing injection hole designed on the cover plate, such as the electrolyte is easy to overflow and the sealing nails are easy to be pushed into the battery cell and affect the battery performance.

[0004] In order to solve the above technical problems, in a first aspect, the utility model provides a pole structure with a liquid injection hole, comprising:

[0005] A cover plate having a pole mounting hole;

[0006] A pole and a connecting piece, wherein the pole is arranged on the upper surface of the cover plate, and the pole is coaxial with the pole mounting hole, the connecting piece passes through the pole mounting hole and the pole in sequence from the lower surface of the cover plate so that the pole is fixedly connected to the cover plate, and a liquid injection hole is formed at the center of the connecting piece and passes through the entire connecting piece in the axial direction of the connecting piece;

[0007] A sealing component is arranged on a side of the injection hole close to the pole to seal the injection hole after injection.

[0008] In some embodiments, the injection hole includes a first groove, a second groove and a third groove, and the first groove, the second groove and the third groove are sequentially connected from top to bottom.

[0009] In some embodiments, the width of the first groove is greater than the width of the second groove, and the width of the second groove is greater than the width of the third groove.

[0010] In some embodiments, the depth of the first groove is less than the depth of the second groove, and the depth of the second groove is less than the depth of the third groove.

[0011] In some embodiments, the sealing assembly includes a first sealing pin and a second sealing pin, wherein the first sealing pin is disposed in the first groove and its edge is seal-welded to the inner wall of the first groove, and the second sealing pin is disposed in the second groove and the third groove and is bonded to the inner walls of the second groove and the third groove.

[0012] In some embodiments, a difference between a depth of the first groove and a thickness of the first sealing pin is less than or equal to 0.1 mm.

[0013] In some embodiments, the second sealing pin is composed of an inserting portion and a limiting portion, the inserting portion is embedded in the third groove, the limiting portion is arranged in the second groove, and the bottom of the limiting portion abuts against the bottom surface of the second groove.

[0014] In some embodiments, the inserting portion and the limiting portion are an integrally formed structure.

[0015] In some embodiments, it also includes an upper plastic part, a lower plastic part and a sealing rubber ring. The upper plastic part and the lower plastic part are respectively arranged on the upper and lower sides of the cover plate located at the pole mounting hole and outside the pole and the rivet, and the sealing rubber ring is arranged between the lower plastic part and the rivet.

[0016] In a second aspect, the utility model further provides a battery core, which includes the pole structure with a liquid injection hole provided in the first aspect of the utility model.

[0017] Compared with the prior art, the utility model provides a pole structure and a battery cell with an injection hole, in which the injection hole is opened at the center of the connecting piece connecting the pole and the cover plate (equivalent to opening a hole on the pole), and is sealed by a sealing component after the injection is completed. Since the length of the connecting piece itself is relatively long, the depth of the opened injection hole can meet the matching requirement of the injection nozzle of the injection machine and the deeper injection hole, so that the injection nozzle can penetrate into the injection hole to inject liquid, preventing the overflow of electrolyte; and the deeper injection hole can also prevent the sealing component from being pushed into the battery cell due to excessive force, avoiding foreign matter from entering the battery cell and affecting the battery performance; in addition, by transferring the injection hole to the pole, there will be more area on the cover plate of the battery cell, which is convenient for the battery pack design to be grouped and welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the end face of a battery cell according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 AA section view.

[0020] The following are the descriptions of the reference numerals:

[0021] 1. Cover plate, 11. Pole mounting hole;

[0022] 2. Pole,

[0023] 3. Connecting piece, 31. Liquid injection hole, 311. First groove, 312. Second groove, 313. Third groove;

[0024] 4. Sealing assembly, 41. first sealing pin, 42. second sealing pin;

[0025] 5. Install plastic parts;

[0026] 6. Remove plastic parts;

[0027] 7. Sealing rubber ring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the current battery cell structure, the injection hole and the pole are respectively arranged on the cover plate. Since the thickness of the cover plate is limited, the depth of the injection hole must be limited. Therefore, when using the injection machine to inject electrolyte, the depth of the injection nozzle inserted into the injection hole is also relatively shallow, which causes the electrolyte to overflow easily, and the sealing nails used for sealing later are also easily pushed into the battery cell, affecting the battery performance.

[0030] To this end, the utility model provides a pole structure with a liquid injection hole, and the liquid injection hole is opened on the pole to solve the problems existing in the above-mentioned prior art.

[0031] The technical solution of the present invention is described in detail below using cylindrical battery cells as an example. It can be understood that this embodiment is only used to explain the present invention and is not used to limit the present invention. The technical solution provided by the present invention includes but is not limited to application in cylindrical battery cells. The principles of application in other types of battery cells are the same as those applied in this embodiment.

[0032] like Figure 1-2As shown, this embodiment provides a pole structure with a liquid injection hole, including a cover plate 1, a pole 2, a connector 3 and a sealing assembly 4, the cover plate 1 is provided with a pole mounting hole 11, the pole 2 is arranged on the upper surface of the cover plate 1, and the pole 2 is coaxial with the pole mounting hole 11, that is, the center of the pole 2 is aligned with the center of the pole mounting hole 11, the connector 3 passes through the pole mounting hole 11 and the pole 2 in sequence from the lower surface of the cover plate 1, the pole 2 is fixedly connected to the cover plate 1, and the assembly of the pole 2 and the cover plate 1 is completed, the center of the connector 3 is formed with a liquid injection hole 31 that runs through the entire connector 3 in the axial direction of the connector 3, and the sealing assembly 4 is provided on the side of the liquid injection hole 31 close to the pole 2, which is used to seal the liquid injection hole 31 after liquid injection.

[0033] In this embodiment, the injection hole 31 is opened on the connector 3. Compared with the prior art in which the hole is opened on the cover plate 1, the connector 3 is obviously thicker than the cover plate 1, and there is enough space for the sealing component 4 to cooperate, which can avoid pushing the sealing component 4 into the battery cell with excessive force, thereby avoiding the introduction of foreign matter into the battery cell and affecting the battery performance; at the same time, due to the large thickness of the connector 3, when using the injection machine for injection, the injection nozzle can be inserted deeper into the injection hole 31, and the electrolyte overflow can be effectively improved. In addition, the injection hole 31 is designed on the connector 3 in this embodiment, leaving more area for the cover plate 1, which is convenient for the battery pack design to be welded in groups.

[0034] It can be understood that the connecting member 3 described in the above technical solution is specifically a rivet; since the battery cell of this embodiment is a cylindrical battery cell, the cover plate 1, the pole 2 and the connecting member 3 are all circular, so the liquid injection hole 31 is opened at the center of the connecting member 3 (that is, the rivet) to form a centrally symmetrical structure, which is more convenient for positioning when the liquid injection machine is used to inject liquid on the battery cell, and the position of the liquid injection hole 31 will not be moved even if the battery cell is rotated.

[0035] Furthermore, when the present embodiment is implemented, the pole 2 and the cover plate 1 must be assembled first: the lower plastic part 6 and the sealing rubber ring 7 are installed on the lower surface of the cover plate 1, with the sealing rubber ring 7 on the inner ring and the lower plastic part 6 on the outer ring, and then the connecting part 3 is inserted from the lower surface of the cover plate 1 into the pole mounting hole 11 and out of the upper surface of the cover plate 1, and then the upper plastic part 5 is sleeved on the outside of the connecting part 3, and finally the pole 2 is sleeved on the upper plastic part 5 and the outside of the connecting part 3, and after installation, riveting is performed to complete the assembly of the pole 2 and the cover plate 1.

[0036] After the pole 2 and the connector 3 are assembled, the upper surface of the pole 2 is flush with the upper surface of the connector 3 .

[0037] Furthermore, in the specific implementation of this embodiment, the process of forming the injection hole 31 is as follows: on the upper surface of the connecting member 3, a circle with the center of the connecting member 3 as the center is formed, and a circle with the center R 2 Draw a circle with radius L and stretch it downward 2 , forming a second groove 312; taking the center of the second groove 312 as the center of the circle, 3 Draw a circle with radius L and stretch it downward 3 , forming a third groove 313; and then taking the center of the upper surface of the connecting member 3 as the center of the circle, R 1 Draw a circle with radius L and stretch it downward 1 , forming a first groove 311, that is, the injection hole 31 is composed of a first groove 311, a second groove 312 and a third groove 313, and the first groove 311, the second groove 312 and the third groove 313 are connected in sequence from top to bottom.

[0038] Furthermore, the radius R of the first groove 311 is 1 Greater than the radius R of the second groove 312 2 , the radius R of the second groove 312 2 Greater than the radius R of the third groove 313 3 , that is, the width of the first groove 311 is greater than the width of the second groove 312 , and the width of the second groove 312 is greater than the width of the third groove 313 .

[0039] Furthermore, the depth L of the first groove 311 is 1 is smaller than the depth L of the second groove 312 2 , the depth of the second groove 312 is less than the depth L of the third groove 313 3 .

[0040] Furthermore, when this embodiment is implemented, the injection hole 31 needs to be sealed after injection. The sealing assembly 4 of this embodiment includes a first sealing pin 41 and a second sealing pin 42. The first sealing pin 41 is arranged in the first groove 311 and the edge is sealed and welded to the inner wall of the first groove 311. The second sealing pin 42 is arranged in the second groove 312 and the third groove 313 and is bonded to the inner walls of the second groove 312 and the third groove 313.

[0041] Furthermore, in the specific implementation of this embodiment, since the length of the connecting piece 3 is relatively long, there is enough space for the sealing assembly 4 to cooperate when the hole is opened. Therefore, the second sealing nail 42 is composed of an insertion portion and a limiting portion. The insertion portion is embedded in the third groove 313, and the limiting portion is arranged in the second groove 312, and the bottom of the limiting portion abuts against the bottom surface of the second groove 312, that is, the structure of the second sealing nail 42 is similar to a "thumbnail" structure. In this way, the second sealing nail 42 can play a limiting role through the limiting portion, further avoiding the second sealing nail 42 being pushed into the interior of the battery cell due to excessive force, thereby avoiding the influence of foreign matter entering the battery cell.

[0042] Furthermore, the inserting portion and the limiting portion are an integrally formed structure.

[0043] Furthermore, in a specific implementation of this embodiment, the difference between the depth of the first groove 311 and the thickness of the first sealing pin 41 is less than or equal to 0.1 mm.

[0044] In addition, the utility model further provides a battery core, which includes the pole structure with the injection hole provided in the above embodiment.

[0045] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A pole structure with a liquid injection hole, characterized in that: include: A cover plate having a pole mounting hole; A pole and a connecting piece, wherein the pole is arranged on the upper surface of the cover plate, and the pole is coaxial with the pole mounting hole, the connecting piece passes through the pole mounting hole and the pole in sequence from the lower surface of the cover plate so that the pole is fixedly connected to the cover plate, and a liquid injection hole is formed at the center of the connecting piece and passes through the entire connecting piece in the axial direction of the connecting piece; A sealing component is arranged on a side of the injection hole close to the pole to seal the injection hole after injection.

2. The pole structure with a liquid injection hole according to claim 1, characterized in that: The injection hole includes a first groove, a second groove and a third groove, and the first groove, the second groove and the third groove are connected in sequence from top to bottom.

3. The pole structure with a liquid injection hole according to claim 2, characterized in that: The width of the first groove is greater than that of the second groove, and the width of the second groove is greater than that of the third groove.

4. The pole structure with a liquid injection hole according to claim 3, characterized in that: The depth of the first groove is smaller than that of the second groove, and the depth of the second groove is smaller than that of the third groove.

5. The pole structure with a liquid injection hole according to claim 2, characterized in that: The sealing assembly includes a first sealing pin and a second sealing pin. The first sealing pin is arranged in the first groove and its edge is seal-welded to the inner wall of the first groove. The second sealing pin is arranged in the second groove and the third groove and is bonded to the inner walls of the second groove and the third groove.

6. The pole structure with a liquid injection hole according to claim 5, characterized in that: The difference between the depth of the first groove and the thickness of the first sealing pin is less than or equal to 0.1 mm.

7. The pole structure with a liquid injection hole according to claim 5, characterized in that: The second sealing pin is composed of an inserting portion and a limiting portion, the inserting portion is embedded in the third groove, the limiting portion is arranged in the second groove, and the bottom of the limiting portion abuts against the bottom surface of the second groove.

8. The pole structure with a liquid injection hole according to claim 7, characterized in that: The inserting portion and the limiting portion are an integrally formed structure.

9. The pole structure with a liquid injection hole according to claim 1, characterized in that: It also includes an upper plastic part, a lower plastic part and a sealing rubber ring. The upper plastic part and the lower plastic part are respectively arranged on the upper and lower sides of the cover plate located at the pole mounting hole and located outside the pole and the connecting part. The sealing rubber ring is arranged between the lower plastic part and the connecting part.

10. A battery cell, characterized in that: The battery core includes a pole structure with a liquid injection hole as described in any one of claims 1 to 9.

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