Top cover structure and battery cell

Abstract

The utility model relates to the technical field of battery top covers, and provides a top cover structure and a battery cell, the top cover structure comprises a cover plate, an insulating part, a pole and a tenon-and-mortise plate, the insulating part is arranged on the cover plate in an abutting manner, and jacks are formed in the peripheral side of the insulating part; the polar column is arranged in the cover plate and the insulating part in a penetrating manner and is propped against one side, far away from the insulating part, of the cover plate, and a clamping groove is formed in the peripheral side of the polar column; the mortise and tenon joint plate is inserted into the inserting hole and abuts against the side, away from the cover plate, in the clamping groove. According to the top cover structure, the tenon-and-mortise plates, the jacks and the clamping grooves are arranged, and the tenon-and-mortise plates can be inserted into the jacks and the clamping grooves after the pole and the insulating part are assembled, so that the pole and the insulating part are fixedly connected, the over-current capability of the top cover structure is guaranteed, the assembly cost of the top cover structure is reduced, and the service life of the top cover structure is prolonged. And the structural reliability of the top cover structure is also improved.

Description

Technical Field

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

[0002] The top cover structure is an important component of the battery. The mainstream top cover structures are injection molded top cover and riveted top cover. The injection molded top cover has strong current flow capacity but poor reliability; the riveted top cover has strong reliability, but due to structural limitations, it has problems such as poor current flow capacity and high manufacturing cost.

[0003] In order to balance the current carrying capacity, structural reliability and manufacturing cost of the top cover structure, different types of top cover structures have emerged. For example, a low-cost battery top cover and lithium battery with announcement number CN216980656U uses the snap-fitting of the snap-fitting portion and the snap-fitting groove to fix the pole and the insulating ring, which not only ensures the current carrying capacity of the top cover structure, but also eliminates the need for laser welding, stamping or riveting operations, thereby reducing the assembly cost of the battery; however, the snap-fitting portion in the above technical solution is arranged on the inner circumferential wall of the insulating ring, and the inner circumferential wall of the insulating ring is in contact with the outer wall of the pole. During the assembly process of the insulating ring and the pole, the snap-fitting portion will collide and squeeze with the pole, which may cause the snap-fitting portion to be easily deformed or even damaged, which is not conducive to improving the fixing firmness of the insulating ring and the pole and the structural reliability of the top cover structure. Utility Model Content

[0004] In view of this, the utility model proposes a top cover structure and a battery cell. By providing a mortise and tenon plate, a socket and a slot, the mortise and tenon plate can be inserted into the socket and the slot after the pole and the insulating part are assembled to fix the pole and the insulating part. The structural reliability of the top cover structure is improved while ensuring the current carrying capacity of the top cover structure and reducing the assembly cost of the top cover structure.

[0005] The technical solution of the utility model is achieved in this way:

[0006] On the one hand, the utility model provides a top cover structure, including a cover plate, an insulating member, a pole and a mortise and tenon plate, wherein:

[0007] The insulating member is disposed against the cover plate, and a plug hole is provided on the peripheral side of the insulating member;

[0008] One end of the pole passes through the cover plate and the insulating member, and the other end abuts against a side of the cover plate away from the insulating member, and a slot is provided on the circumference of the pole;

[0009] The mortise and tenon plate enters the insulating member through the insertion hole and is inserted into the clamping groove to relatively fix the cover plate, the insulating member and the pole.

[0010] On the basis of the above technical solution, preferably, it further comprises a sealing ring, wherein the sealing ring is fixedly arranged between the cover plate and the pole.

[0011] More preferably, the sealing ring is made of elastic material, and a gap is provided between the mortise and tenon plate and a side of the slot close to the cover plate.

[0012] More preferably, the mortise and tenon plate is fixedly connected to the slot and / or the socket by interference fit.

[0013] On the basis of the above technical solution, preferably, the cross section of the slot close to the center line of the pole is non-arc-shaped, and one end of the mortise and tenon plate close to the pole is in contact with the slot.

[0014] More preferably, the slot comprises an arc segment and two straight edge segments, and both the arc segment and the straight edge segments are provided on the circumferential side of the pole; the two straight edge segments are respectively arranged on both sides of the arc segment and are continuously arranged therewith.

[0015] More preferably, the mortise and tenon plate includes a supporting end and a fixing end, wherein:

[0016] One end of the abutting end is disposed in the card slot;

[0017] The fixed end is fixedly arranged at one end of the abutting end away from the pole, and is slidably arranged in the insertion hole, and is made of plastic material.

[0018] On the basis of the above technical solution, preferably, two mortise and tenon plates are provided, and the two mortise and tenon plates are symmetrically arranged about the center line of the pole.

[0019] On the basis of the above technical solution, preferably, a fixing block is further included, wherein the fixing block is arranged in the insulating member and abuts against a side thereof away from the cover plate, and the pole and the mortise and tenon plate both pass through the fixing block.

[0020] On the other hand, the utility model provides a battery core, comprising the above-mentioned top cover structure.

[0021] Compared with the prior art, the top cover structure and the battery cell of the utility model have the following beneficial effects:

[0022] (1) By providing the mortise and tenon plate, the insertion hole and the slot, after the pole and the insulating member are assembled, the mortise and tenon plate can be inserted into the insertion hole and the slot to fix the pole and the insulating member. This not only ensures the current carrying capacity of the top cover structure, reduces the assembly cost of the top cover structure, but also improves the structural reliability of the top cover structure.

[0023] (2) By setting two fixing methods of the mortise and tenon plates, one can be selected for application according to actual working conditions, thereby improving the adaptability of the top cover structure assembly operation;

[0024] (3) By providing the arc segment and the straight edge segment, the mortise and tenon plate can be used to support the pole to prevent the pole from rotating during use. By providing the mortise and tenon plate to include a fixed end and a supporting end, and making the fixed end made of a plastic material, the fixed end can be fixed to the insulating member by hot melting, thereby improving the overall performance of the top cover structure. 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 An exploded view of a top cover structure of the utility model;

[0027] Figure 2 It is a partial cross-sectional view of a top cover structure of the utility model;

[0028] Figure 3 It is a cross-sectional view of a card slot in a top cover structure of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in 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.

[0030] like Figure 1-3 As shown, a top cover structure of the utility model includes a cover plate 1, an insulating member 2, a pole 3, a mortise and tenon plate 4, a fixing block 5 and a sealing ring 6.

[0031] The cover plate 1 is used to carry other components and is connected to the housing of the battery cell.

[0032] The insulating member 2 is disposed against the cover plate 1 and is usually made of a hard plastic material, and plays the role of insulating, sealing and fixing the cover plate 1 and the pole 3 .

[0033] The pole 3 is arranged through the cover plate 1 and the insulating member 2, one end of which is electrically connected to the winding core tab in the battery shell through the adapter, and the other end is electrically connected to the power circuit outside the battery shell or the pole 3 of other batteries. Two poles 3 are usually arranged on each top cover structure, namely the positive pole 3 and the negative pole 3.

[0034] The insulating member 2 is provided with a plug hole 201 on its peripheral side, and the plug hole 201 penetrates the insulating member 2. The pole 3 is provided with a slot 301 on its peripheral side, and the pole 3 abuts against the side of the cover plate 1 away from the insulating member 2. The mortise and tenon plate 4 is inserted into the plug hole 201 and abuts against the side of the slot 301 away from the cover plate 1. Figure 2 As shown, the cover plate 1 is used to support the pole 3, so as to prevent the pole 3 from moving upward, and the mortise and tenon plate 4 is used to support the slot 301, so as to prevent the pole 3 from moving downward. By combining the contact between the cover plate 1 and the insulating member 2 and the fixation between the mortise and tenon plate 4 and the insulating member 2, the cover plate 1, the insulating member 2, the pole 3 and the mortise and tenon plate 4 can be fixedly connected to realize the assembly and fixation of the top cover structure.

[0035] During the assembly process of the top cover structure, there is no need to perform laser welding, stamping or riveting operations, which simplifies the assembly process of the top cover structure and reduces the assembly cost of the top cover structure. The assembly operation of the mortise and tenon plate 4 is performed after the assembly operation of the pole 3 and the insulating member 2, and the mortise and tenon plate 4 will not be squeezed or collided with other components, thereby further improving the structural reliability of the top cover structure. At the same time, the various components in the top cover structure can be welded by laser, which is also beneficial to reduce the internal resistance of the structure and increase its current carrying capacity, thereby helping to improve the overall performance of the top cover structure.

[0036] The fixing block 5 is arranged in the insulating part 2 and abuts against the side thereof away from the cover plate 1, and the pole 3 and the mortise and tenon plate 4 both pass through the fixing block 5. The fixing block 5 is made of metal material, which has relatively large hardness and can conduct electricity, which is not only conducive to improving the fixing firmness of the mortise and tenon plate 4, but also can increase the current carrying capacity of the top cover structure.

[0037] The sealing ring 6 is fixedly arranged between the cover plate 1 and the pole 3 , and also plays the role of sealing, insulating and fixing the pole 3 and the cover plate 1 .

[0038] Regarding the assembly method of the mortise and tenon plate 4, the utility model provides two connection structures:

[0039] The first is an interference fit connection, that is, the outer diameter of the mortise and tenon plate 4 is slightly larger than the inner diameter of the slot 301 and / or the socket 201, and the mortise and tenon plate 4 is fixedly connected to the slot 301 and / or the socket 201 by an interference fit. It is preferred that the mortise and tenon plate 4 is connected to both by an interference fit; when assembling the mortise and tenon plate 4, the mortise and tenon plate 4 is knocked or pressed into the slot 301 and the socket 201 to achieve assembly of the top cover structure.

[0040] The second type is a clearance fit connection, that is, the outer diameter of the mortise and tenon plate 4 is slightly smaller than the inner diameter of the slot 301 and the insertion hole 201, so that the mortise and tenon plate 4 can be easily inserted into the slot 301 and the insertion hole 201. In order to prevent the mortise and tenon plate 4 from slipping out of the slot 301, the sealing ring 6 is made of elastic material. After the pole 3 is connected to the mortise and tenon plate 4, the sealing ring 6 is contracted, so that the elastic force of the sealing ring 6 allows the mortise and tenon plate 4 to be pressed against the side of the slot 301 away from the cover plate 1, so that a gap is set between the mortise and tenon plate 4 and the side of the slot 301 close to the cover plate 1.

[0041] The cross section of the slot 301 near the center line of the pole 3 is non-circular, and the end of the mortise and tenon plate 4 near the pole 3 is in contact with the slot 301. The non-circular side surface changes shape during rotation. The end of the mortise and tenon plate 4 is used to support the side of the pole 3 to prevent the pole 3 from rotating during use.

[0042] As a preferred embodiment, the slot 301 includes an arc segment 3011 and two straight edge segments 3012. The arc segment 3011 and the straight edge segments 3012 are both provided on the circumference of the pole 3, and the two straight edge segments 3012 are respectively provided on both sides of the arc segment 3011 and are continuously provided therewith. Figure 3 As shown, the end of the mortise and tenon plate 4 is in a clamp shape, which abuts against the two straight edge sections 3012, thereby effectively preventing the pole 3 from rotating.

[0043] As a preferred embodiment, the mortise and tenon plate 4 includes a supporting end 41 and a fixing end 42. Figure 3 As shown, one end of the abutting end 41 is arranged in the card slot 301, and abuts against the side of the cover plate 1 inside it; the fixed end 42 is fixedly arranged at the end of the abutting end 41 away from the pole 3, and is slidably arranged in the socket 201, and the fixed end 42 is made of plastic material; when the mortise and tenon plate 4 is assembled, the fixed end 42 and the insulating member 2 can be fixed by hot melting, so as to prevent the mortise and tenon plate 4 from being separated from the insulating member 2, so that the structural reliability of the top cover structure is further improved.

[0044] In this embodiment, two mortise and tenon plates 4 are provided, and the two mortise and tenon plates 4 are symmetrically arranged about the center line of the pole 3, thereby improving the fixing firmness and fixing stability of the top cover structure.

[0045] like Figure 1As shown, a fixing groove 101 is provided on the cover plate 1, and the insulating member 2 is clamped in the fixing groove 101, thereby preventing the insulating member 2 from sliding on the cover plate 1, thereby improving the fixing firmness and structural reliability of the top cover structure.

[0046] An assembly method of a top cover structure of the utility model is as follows:

[0047] First, the fixing block 5, the insulating member 2, the cover plate 1 and the sealing ring 6 are stacked in sequence, and then the pole 3 passes through the sealing ring 6, the cover plate 1, the insulating member 2 and the fixing block 5 in sequence, and the pole 3 is allowed to support the sealing ring 6, and finally the mortise and tenon plate 4 is inserted into the insertion hole 201 and the card slot 301 in sequence to complete the assembly of the top cover structure; if necessary, the fixed end 42 can also be fixedly connected to the insulating member 2 by hot melting.

[0048] The utility model provides a battery cell, comprising the top cover structure, using the end cover formed by the top cover structure as a closure member for the core package of the square shell battery cell shell at the opening side of the shell, and welding the pole ear on the core package with the pole 3 on the top cover to form a complete battery cell.

[0049] 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 top cover structure, characterized in that: It comprises a cover plate (1), an insulating member (2), a pole (3) and a mortise and tenon plate (4), wherein: The insulating member (2) is disposed in contact with the cover plate (1), and a plug hole (201) is provided on the peripheral side of the insulating member (2); One end of the pole (3) passes through the cover plate (1) and the insulating member (2), and the other end abuts against a side of the cover plate (1) away from the insulating member (2), and a slot (301) is provided on the circumference of the pole (3); The mortise and tenon plate (4) enters the insulating member (2) through the insertion hole (201) and is inserted into the clamping groove (301) to relatively fix the cover plate (1), the insulating member (2) and the pole (3).

2. A top cover structure according to claim 1, characterized in that: It also comprises a sealing ring (6), wherein the sealing ring (6) is fixedly arranged between the cover plate (1) and the pole (3).

3. A top cover structure according to claim 2, characterized in that: The sealing ring (6) is made of elastic material, and a gap is provided between the mortise and tenon plate (4) and a side of the slot (301) close to the cover plate (1).

4. A top cover structure according to claim 2, characterized in that: The mortise and tenon plate (4) is fixedly connected to the slot (301) and / or the insertion hole (201) by means of interference fit.

5. A top cover structure according to claim 1, characterized in that: The cross section of the slot (301) on the side close to the center line of the pole (3) is non-arc-shaped, and one end of the mortise and tenon plate (4) close to the pole (3) abuts against the slot (301).

6. A top cover structure according to claim 5, characterized in that: The clamping slot (301) comprises an arc segment (3011) and two straight edge segments (3012); the arc segment (3011) and the straight edge segments (3012) are both provided on the circumference of the pole (3); the two straight edge segments (3012) are respectively arranged on both sides of the arc segment (3011) and are arranged continuously therewith.

7. A top cover structure according to claim 6, characterized in that: The mortise and tenon plate (4) comprises a supporting end (41) and a fixing end (42), wherein: One end of the abutting end (41) is disposed in the card slot (301); The fixed end (42) is fixedly arranged at an end of the abutting end (41) away from the pole (3), and is slidably arranged in the insertion hole (201), and is made of plastic material.

8. A top cover structure according to claim 1, characterized in that: Two mortise and tenon plates (4) are provided, and the two mortise and tenon plates (4) are symmetrically arranged about the center line of the pole (3).

9. A top cover structure according to claim 1, characterized in that: It also comprises a fixing block (5), wherein the fixing block (5) is arranged in the insulating member (2) and abuts against a side thereof away from the cover plate (1), and the pole (3) and the mortise and tenon plate (4) both pass through the fixing block (5).

10. A battery cell, characterized in that: The invention comprises the top cover structure according to any one of claims 1 to 9.

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