Storage battery end cover and storage battery

Abstract

The utility model provides a storage battery end cover and a storage battery, and relates to the technical field of storage batteries, the storage battery end cover comprises a middle cover and a terminal, the middle cover is provided with a mounting hole connected with the terminal, the storage battery end cover also comprises a connecting piece, the middle cover is made of a hard material, the terminal is provided with a covering piece made of a soft material, and the material of the connecting piece is the same as that of the covering piece; the connecting piece is sleeved on the covering piece, one end, with the covering piece, of the terminal penetrates through the mounting hole and extends to the outer side of the middle cover, the upper end of the connecting piece is in threaded connection with the bottom surface of the middle cover, the connecting piece is in sealed connection with the middle cover through a sealing structure, and the lower end of the connecting piece is in sealed connection with the covering piece in a heat-seal welding mode. According to the storage battery end cover disclosed by the utility model, the middle cover and the covering part are made of different materials, and effective heat-seal welding between the covering part and the middle cover is realized by virtue of the connecting part which is made of the same material as the covering part, so that the sealing property requirement after heat-seal welding is met, and the problem of cracking of the covering part on the terminal is avoided.

Description

Technical Field

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

[0002] In the field of lead-acid batteries, the end cap of the battery is usually assembled from a middle cap and a terminal. During the battery assembly process, the middle cap and the covering parts on the terminal are first sealed and connected, and then the terminal is electrically connected to the pole group. Finally, the pole group is inserted into the battery shell. After filling with electrolyte, the shell and the middle cap are sealed and connected.

[0003] In the prior art, the battery housing, the middle cover and the terminal cover need to be heat-sealed and welded together by heating the mold to maintain the seal. Due to the mutual fusion characteristics between different materials, the three are required to be made of the same material.

[0004] If the shell, middle cover and terminal cover are all made of soft materials, although the sealing problem after heat sealing welding can be met, the shell and middle cover are prone to bulging under the internal pressure of the battery. In order to solve the swelling problem, the shell of lead-acid batteries usually requires the use of hard materials to prevent the battery from bulging outward under the internal pressure; the middle cover is usually made of the same material as the shell to facilitate heat sealing welding of the middle cover and the shell. If the terminal cover is made of the same material as the middle cover, although the heat sealing welding between the three can be met to ensure the sealing, the terminal cover is made of hard material and has a thin wall thickness. During the use of the battery, the internal pressure will cause the terminal cover to crack. Therefore, to improve the cracking problem of the terminal cover, the terminal cover needs to be made of soft and tough materials. In this way, due to the different materials of the terminal cover and the middle cover, during the heat sealing process of different materials, the strong welding sealing cannot be met, which is easy to cause electrolyte leakage.

[0005] Therefore, at present, the cover plate structure of the battery cannot simultaneously meet the sealing requirements after heat sealing welding and the requirements for avoiding cracking of the terminal cover. Utility Model Content

[0006] In view of this, the utility model proposes a battery end cover and a battery to solve the problem that the battery cover structure in the prior art cannot simultaneously meet the sealing requirements after heat sealing welding and the requirement of avoiding cracking of the terminal cover.

[0007] The technical solution of the utility model is achieved in this way:

[0008] On the one hand, the utility model provides a battery end cover, which includes a middle cover and a terminal, the middle cover is provided with a mounting hole connected to the terminal, and also includes a connecting piece, the middle cover is made of a hard material, and a covering piece of a soft material is provided on the terminal, and the material of the connecting piece is the same as that of the covering piece; the connecting piece is sleeved on the covering piece, and one end of the terminal with the covering piece passes through the mounting hole and extends to the outside of the middle cover, the upper end of the connecting piece is threadedly connected to the bottom surface of the middle cover, and the connecting piece and the middle cover are sealed by a sealing structure, and the lower end of the connecting piece and the covering piece are sealed by heat sealing welding.

[0009] On the basis of the above technical solution, preferably, a cylinder with a bottom opening is fixedly arranged on the outside of the mounting hole on the bottom surface of the middle cover, the connecting piece includes a cylinder sleeve and a first flange fixedly arranged at the bottom end of the cylinder sleeve, the cylinder sleeve is inserted into the cylinder, the outer arm of the cylinder sleeve is provided with an external thread, the inner wall of the cylinder is provided with an internal thread connected to the external thread, a sealing structure is provided between the cylinder and the connecting piece, and the first flange and the covering piece are heat-sealed and connected.

[0010] Further, preferably, the covering member includes a covering sleeve and a connecting sleeve which are integrally formed and fixed on the outer peripheral wall of the terminal, the covering sleeve is located at the upper end of the terminal, the connecting sleeve is located at the bottom end of the covering sleeve, the outer diameter of the connecting sleeve is larger than the outer diameter of the covering sleeve, the connecting member is sleeved on the outer peripheral side of the covering sleeve, the bottom surface of the first flange abuts against the top surface of the connecting sleeve, and the bottom surface of the first flange and the top surface of the connecting sleeve are heat-sealed.

[0011] On the basis of the above technical solution, preferably, the sealing structure comprises a first sealing ring, which is sleeved on the outside of the covering sleeve and located between the top end of the sleeve and the inner top surface of the sleeve.

[0012] Further, preferably, the sealing structure also includes a second sealing ring, the bottom end of the cylinder horizontally extends to form a second flange connected to the top surface of the first flange, and the second sealing ring is sleeved on the outside of the cylinder sleeve and located between the first flange and the second flange.

[0013] Preferably, a glue reducing groove is provided at the connection between the covering sleeve and the connecting sleeve.

[0014] Preferably, the bottom of the connecting piece has a guide opening with a conical structure.

[0015] Preferably, the mounting hole and the covering sleeve are clearance-matched, and the connecting piece and the covering sleeve are clearance-matched.

[0016] On the other hand, the utility model provides a battery, comprising an outer shell, a pole group and the battery end cover described in the first aspect, wherein the outer shell is made of a hard material, the end of the terminal away from the middle cover is electrically connected to the pole group, the pole group is arranged in the outer shell, and the middle cover covers the open end of the outer shell and is sealed with the outer shell.

[0017] On the basis of the above technical solution, preferably, an annular step is provided on the outer peripheral side of the opening end of the shell, and an annular groove corresponding to the annular step is provided on the bottom surface of the middle cover.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) By setting the cover to be a soft material, the problem of cracking of the cover on the terminal can be avoided. The cover on the entire terminal is not heat-sealed with the middle cover, but is heat-sealed and welded with a connector made of the same material as the cover. After heat-sealing and welding, effective sealing can be achieved. The connector is fixedly connected to the middle cover by a threaded connection. At the same time, the connector and the middle cover are sealed by a sealing structure. While the middle cover and the cover are made of different materials, effective heat-sealing welding between the cover and the middle cover is achieved with the help of the connector, which satisfies the sealing requirements after heat-sealing welding and avoids the problem of cracking of the cover on the terminal.

[0020] (2) By extending the second flange horizontally outward at the bottom end of the cylinder body, a larger contact area can be provided between the first flange and the second flange, thereby facilitating the second sealing ring to establish a sealed connection between the first flange and the second flange. Since the second sealing ring seals the gap between the first flange and the second flange, and heat-sealing welding is performed between the contact surface of the connecting sleeve and the first flange, leakage of electrolyte through the above-mentioned gap can be avoided, thereby improving the sealing of the battery end cover.

[0021] (3) By providing a glue reduction groove at the connection between the covering sleeve and the connecting sleeve, when the heat generated during welding causes the covering sleeve or the connecting piece to expand, the glue reduction groove can provide space for their expansion, thereby reducing deformation or damage caused by thermal stress. In addition, during the heat sealing process, the overflow glue formed by the heat sealing between the covering sleeve and the first flange can be filled into the glue reduction groove to avoid overflow and affect the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a schematic diagram of the planar structure of the battery end cover disclosed in the utility model;

[0024] Figure 2 It is a schematic diagram of the planar structure of the middle cover disclosed in the utility model;

[0025] Figure 3 It is a schematic diagram of the planar structure of the terminal and the connector disclosed in the utility model;

[0026] Figure 4 It is a schematic diagram of the planar structure of the storage battery disclosed in the utility model;

[0027] Reference numerals:

[0028] 1. Middle cover; 2. Terminal; 5. Cover; 10. Mounting hole; 3. Connector; 4. Sealing structure; 11. Cylinder; 31. Cylinder sleeve; 32. First flange; 51. Covering sleeve; 52. Connecting sleeve; 111. Second flange; 41. First sealing ring; 42. Second sealing ring; 50. Glue reduction groove; 30. Guide port; 6. Outer shell; 7. Pole group; 61. Annular step; 12. Annular groove. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 1 As shown, combined Figure 2-3 The utility model discloses a battery end cover, including a middle cover 1 and a terminal 2. The middle cover 1 is provided with a mounting hole 10 connected to the terminal 2. Specifically, the middle cover 1 is made of hard plastic material, which is the same as the outer shell 6 used in the battery. This can make the shell formed by the outer shell 6 and the middle cover 1 have a higher structural strength, avoid the shell bulging caused by the internal pressure of the battery, and improve the safety performance of the battery. In this embodiment, the hard plastic material can be polycarbonate (PC), polystyrene (PS), polypropylene (PP), high-density polyethylene (HDPE), etc.

[0031] In this embodiment, mounting holes 10 are respectively provided at both ends of the middle cover 1. Correspondingly, two terminals 2 are also provided, which are metal conductive electrode columns, preferably made of copper or aluminum. The two terminals 2 serve as the positive electrode column and the negative electrode column respectively. One end of the terminal 2 is used to connect to the electrode group 7 inside the battery, and the other end is used to connect to the electrical equipment.

[0032] In order to establish a connection between the terminal 2 and the middle cover 1, a cover 5 is usually provided on the terminal 2, so that the cover 5 and the middle cover 1 are sealed and fixedly connected by heat sealing. In order to prevent the cover 5 from cracking on the terminal 2, the cover 5 in this example is set to be a soft plastic material. In this way, although the problem of cracking of the cover 5 on the terminal 2 is solved, due to the different materials of the middle cover 1 and the cover 5, the heat sealing welding effect will be deteriorated and the sealing performance cannot be guaranteed.

[0033] To this end, the battery end cover disclosed in this embodiment also includes a connector 3, and the material of the connector 3 is the same as that of the cover 5, both of which are soft plastic materials. In this embodiment, the soft plastic material can be polyethylene (PE), polyvinyl chloride (PVC), polybutylene (PBT) and ethylene-vinyl acetate copolymer (EVA), etc. The connector 3 is sleeved on the cover 5, and one end of the terminal 2 with the cover 5 passes through the mounting hole 10 and extends to the outside of the middle cover 1. The upper end of the connector 3 is threadedly connected to the bottom surface of the middle cover 1, and the connector 3 and the middle cover 1 are sealed by a sealing structure 4, and the lower end of the connector 3 and the cover 5 are sealed by heat sealing welding.

[0034] By adopting the above technical solution, by setting the cover 5 to be a soft material, the problem of cracking of the cover 5 on the terminal 2 can be avoided. The cover 5 on the entire terminal 2 is not heat-sealed with the middle cover 1, but is heat-sealed and welded with the connector 3 of the same material as the cover 5. By heat-sealing and welding the cover 5 and the connector 3 of the same material, the consistency of the thermal expansion coefficient during welding can be ensured, and the risk of cracks can be reduced. Such a design can also improve the sealing performance, because heat-sealing welding between the same materials is easier to form a uniform welding interface and reduce the possibility of leakage. The connector 3 is fixedly connected to the middle cover 1 by a threaded connection, and the connector 3 and the middle cover 1 are sealed by a sealing structure 4, which can avoid leakage of electrolyte between the connector 3 and the middle cover 1.

[0035] The entire battery end cover uses different materials for the middle cover 1 and the cover 5, and uses the connector 3 to achieve effective heat sealing welding between the cover 5 and the middle cover 1, which meets the sealing requirements after heat sealing welding and avoids the problem of cracking of the cover 5 on the terminal 2.

[0036] In order to establish a connection between the connecting member 3 and the middle cover 1, in this embodiment, a cylinder 11 with a bottom opening is fixedly arranged on the outer side of the mounting hole 10 on the bottom surface of the middle cover 1. The inner diameter of the cylinder 11 is larger than the aperture of the mounting hole 10, so that the connecting member 3 is accommodated in the cylinder 11. The connecting member 3 includes a cylinder sleeve 31 and a first flange 32 fixedly arranged at the bottom end of the cylinder sleeve 31. The cylinder sleeve 31 is inserted into the cylinder 11. The outer arm of the cylinder sleeve 31 is provided with an external thread, and the inner wall of the cylinder 11 is provided with an internal thread connected to the external thread. The sealing structure 4 is arranged between the cylinder 11 and the connecting member 3, and the first flange 32 and the covering member 5 are heat-sealed and connected.

[0037] By adopting the above technical solution, during the assembly process of the battery end cover, the connector 3 is first sleeved on the cover 5, and then the end of the terminal 2 with the cover 5 is passed through the mounting hole 10. At this time, the sleeve 31 on the connector 3 is inserted into the cylinder 11 on the bottom surface of the middle cover 1, and the connector 3 is screwed so that the external thread on the sleeve 31 and the internal thread inside the cylinder 11 are threadedly connected. The connector 3 and the cylinder 11 can be quickly assembled by threaded connection. Before assembly, the sealing structure 4 can be placed between the cylinder 11 and the connector 3. When the cylinder 11 and the connector 3 are threadedly tightened, the sealing connection between the cylinder 11 and the connector 3 can be achieved under the action of the sealing structure 4 to avoid leakage of electrolyte. The first flange 32 and the cover 5 are heat-sealed, so that after the connector 3 and the cover 5 are welded with the same material, it is easier to form a uniform welding interface, thereby reducing the possibility of leakage.

[0038] In order to facilitate heat-sealing welding of the connector 3 and the cover 5, the present embodiment provides a structural arrangement for the cover 5. Specifically, the cover 5 includes a covering sleeve 51 and a connecting sleeve 52 integrally formed and fixedly arranged on the outer peripheral wall of the terminal 2. The covering sleeve 51 is located at the upper end of the terminal 2, and the connecting sleeve 52 is located at the bottom end of the covering sleeve 51. The outer diameter of the connecting sleeve 52 is greater than the outer diameter of the covering sleeve 51. The bottom surface of the first flange 32 abuts against the top surface of the connecting sleeve 52, and the bottom surface of the first flange 32 and the connecting sleeve 52 are in contact with each other. The top surfaces are heat-sealed and connected. The above-mentioned technical scheme is adopted. When the connecting piece 3 is sleeved on the covering sleeve 51, the connecting piece 3 can be restricted from sliding along the axial direction of the covering sleeve 51 due to the obstruction of the connecting sleeve 52. During the threaded connection between the sleeve 31 and the cylinder body 11, when the sleeve 31 is connected to the cylinder body 11 in place, the first flange 32 at the bottom end of the sleeve 31 abuts against the top surface of the connecting sleeve 52, thereby facilitating heat-sealing welding through the contact surface between the first flange 32 and the connecting sleeve 52.

[0039] In order to achieve a sealed connection between the connector 3 and the cylinder 11, the sealing structure 4 of this embodiment is provided with a first sealing ring 41, which is sleeved on the outside of the covering sleeve 51 and located between the top of the sleeve 31 and the inner top surface of the cylinder 11. With this arrangement, when the sleeve is connected to the cylinder 11 by threading, and the top of the sleeve 31 abuts against the inner top surface of the cylinder 11, a sealed connection between the top of the sleeve 31 and the inner top surface of the cylinder 11 can be established by the first sealing ring 41, so as to prevent external gas or impurities from entering the interior of the shell through the gap between the top of the sleeve 31 and the inner top surface of the cylinder 11 after passing through the mounting hole 10, thereby improving the sealing performance.

[0040] In order to prevent the electrolyte from leaking outward through the mounting hole 10, the sealing structure 4 of the present embodiment further includes a second sealing ring 42. In order to facilitate the installation of the second sealing ring 42 between the connector 3 and the barrel 11, the second flange 111 connected to the top surface of the first flange 32 is formed by horizontally extending at the bottom end of the barrel 11. The second sealing ring 42 is sleeved on the outside of the barrel sleeve 31 and is located between the first flange 32 and the second flange 111. Thus, by horizontally extending the second flange 111 outward from the bottom end of the barrel 11, a larger contact area can be provided between the first flange 32 and the second flange 111, so that the second sealing ring 42 can establish a sealed connection between the first flange 32 and the second flange 111. Since the second sealing ring 42 seals the gap between the first flange 32 and the second flange 111, and the contact surface between the connecting sleeve 52 and the first flange 32 is heat-sealed and welded, the electrolyte can be prevented from leaking through the above gap, thereby improving the sealing performance of the battery end cover.

[0041] Preferably, a glue reduction groove 50 is provided at the connection between the covering sleeve 51 and the connecting sleeve 52. Thus, the heat generated during welding may cause thermal expansion of the covering sleeve 51 or the connecting member 3, and the glue reduction groove 50 can provide space for their expansion, thereby reducing deformation or damage caused by thermal stress. In addition, during the heat sealing process, the overflow glue formed by the heat sealing between the covering sleeve 51 and the first flange 32 can be filled into the glue reduction groove 50 to avoid overflow and affect the appearance.

[0042] As some preferred embodiments, the bottom of the connector 3 has a conical guide opening 30. Thus, when the connector 3 and the cover 5 are installed, the connector 3 can be conveniently sleeved from the top of the terminal 2 downward onto the covering sleeve 51 through the guide opening 30, thereby improving assembly efficiency.

[0043] Preferably, the mounting hole 10 and the covering sleeve 51 are clearance-matched, and the connector 3 and the covering sleeve 51 are clearance-matched. After the connector 3 is sleeved on the cover 5, the top of the terminal 2 is passed through the mounting hole 10, which facilitates the assembly between the various components.

[0044] See attached Figure 4 As shown, the utility model provides a battery, comprising a shell 6, a pole group 7 and the battery end cover described in the first aspect, wherein the shell 6 is made of a hard material, the end of the terminal 2 away from the middle cover 1 is electrically connected to the pole group 7, the pole group 7 is arranged in the shell 6, the middle cover 1 covers the open end of the shell 6 and is sealed with the shell 6, and the battery disclosed in this embodiment is preferably a lead-acid battery.

[0045] Since the middle cover 1 and the outer shell 6 in the battery end cover are made of hard materials, the problem of swelling of the outer shell 6 and the middle cover 1 caused by the internal pressure of the battery can be avoided. The cover 5 and the connector 3 on the terminal 2 are made of soft materials. Therefore, the middle cover 1 and the cover 5 are made of different materials. With the help of the connector 3, effective heat sealing welding between the cover 5 and the middle cover 1 is achieved, which meets the sealing requirements after heat sealing welding and avoids the problem of cracking of the cover 5 on the terminal 2.

[0046] As some optional embodiments, the connection between the outer shell 6 and the middle cover 1 is connected by heat sealing welding. Preferably, an annular step 61 is provided on the outer peripheral side of the open end of the outer shell 6, and an annular groove 12 corresponding to the annular step 61 is provided on the bottom surface of the middle cover 1. In this way, during the heat sealing process, the annular step 61 is provided to facilitate the heat sealing welding head to extend into the annular groove 12 to achieve heat sealing welding of the contact surface between the middle cover 1 and the outer shell 6. In this embodiment, the outer edge of the annular groove 12 has an annular flange, and the bottom surface of the annular flange is lower than the bottom surface of the middle cover 1. In this way, the heat sealing joint surface can be shielded. On the other hand, the overflow glue generated during the heat sealing process can be contained in the annular groove 12 to avoid overflow and affect the appearance.

[0047] 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 end cover, comprising a middle cover (1) and a terminal (2), wherein the middle cover (1) is provided with a mounting hole (10) connected to the terminal (2), characterized in that: The terminal (2) further comprises a connecting piece (3), wherein the middle cover (1) is made of hard plastic material, and a covering piece (5) made of soft plastic material is arranged on the terminal (2); the material of the connecting piece (3) is the same as that of the covering piece (5); the connecting piece (3) is sleeved on the covering piece (5), and one end of the terminal (2) with the covering piece (5) passes through the mounting hole (10) and extends to the outside of the middle cover (1); the upper end of the connecting piece (3) is threadedly connected to the bottom surface of the middle cover (1), and the connecting piece (3) and the middle cover (1) are sealed by a sealing structure (4); and the lower end of the connecting piece (3) and the covering piece (5) are sealed by heat sealing welding.

2. The battery end cap according to claim 1, characterized in that: A cylinder (11) with a bottom opening is fixedly arranged outside the mounting hole (10) on the bottom surface of the middle cover (1); the connecting piece (3) comprises a cylinder sleeve (31) and a first flange (32) fixedly arranged at the bottom end of the cylinder sleeve (31); the cylinder sleeve (31) is inserted into the cylinder (11); an outer arm of the cylinder sleeve (31) is provided with an external thread; an inner wall of the cylinder sleeve (31) is provided with an internal thread connected to the external thread; a sealing structure (4) is arranged between the cylinder (11) and the connecting piece (3); and the first flange (32) and the covering piece (5) are heat-sealed and welded.

3. The battery end cap according to claim 2, characterized in that: The covering member (5) comprises a covering sleeve (51) and a connecting sleeve (52) which are integrally formed and fixedly arranged on the outer peripheral wall of the terminal (2); the covering sleeve (51) is located at the upper end of the terminal (2); the connecting sleeve (52) is located at the bottom end of the covering sleeve (51); the outer diameter of the connecting sleeve (52) is larger than the outer diameter of the covering sleeve (51); the connecting member (3) is sleeved on the outer peripheral side of the covering sleeve (51); the bottom surface of the first flange (32) abuts against the top surface of the connecting sleeve (52); and the bottom surface of the first flange (32) and the top surface of the connecting sleeve (52) are heat-sealed and welded.

4. The battery end cap according to claim 3, characterized in that: The sealing structure (4) comprises a first sealing ring (41), which is sleeved on the outside of the covering sleeve (51) and located between the top end of the cylinder sleeve (31) and the inner top surface of the cylinder body (11).

5. The battery end cap according to claim 4, characterized in that: The sealing structure (4) further comprises a second sealing ring (42); the bottom end of the cylinder (11) extends horizontally to form a second flange (111) connected to the top surface of the first flange (32); the second sealing ring (42) is sleeved on the outside of the cylinder sleeve (31) and is located between the first flange (32) and the second flange (111).

6. The battery end cap according to claim 3, characterized in that: A glue reducing groove (50) is provided at the connection between the covering sleeve (51) and the connecting sleeve (52).

7. The battery end cap according to claim 2, characterized in that: The bottom of the connecting piece (3) has a guide opening (30) with a conical structure.

8. The battery end cap according to claim 3, characterized in that: The mounting hole (10) and the covering sleeve (51) are clearance-matched, and the connecting piece (3) and the covering sleeve (51) are clearance-matched.

9. A battery, comprising a housing (6), a pole group (7) and a battery end cover as claimed in any one of claims 1 to 7, characterized in that: The outer shell (6) is made of a hard material, the end of the terminal (2) away from the middle cover (1) is electrically connected to the pole group (7), the pole group (7) is arranged in the outer shell (6), and the middle cover (1) covers the open end of the outer shell (6) and is sealed to the outer shell (6).

10. The storage battery according to claim 9, characterized in that: An annular step (61) is provided on the outer peripheral side of the opening end of the outer shell (6), and an annular groove (12) corresponding to the annular step (61) is provided on the bottom surface of the middle cover (1).

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