CN116435725A - Battery top cover and battery - Google Patents

Abstract

The invention belongs to the technical field of battery manufacturing, and discloses a battery top cover and a battery, including a top cover body, a conductive component, a sealing member and a sealing ring. There is a mounting hole on the top cover body. The conductive component includes a pole. hole, and the length of the sealing member in the first direction is smaller than the length of the pole in the first direction, and the first direction is parallel to the axial direction of the liquid injection hole. The sealing ring is sleeved outside the pole and is used to seal the space between the pole and the installation hole. After the liquid injection is completed, the liquid injection hole is blocked with a seal, and the length of the seal in the first direction is smaller than the length of the pole in the first direction. The battery top cover not only prevents the seal from occupying the capacity of the battery core by opening a liquid injection hole on the pole, so that the volume of the battery is reduced, but also prevents the seal from interfering with the electrode assembly, thereby ensuring battery safety.

Description

Battery top cover and battery

technical field

The invention relates to the technical field of battery manufacturing, in particular to a battery top cover and a battery.

Background technique

In the existing battery structure, the liquid injection hole is often arranged on the cover body of the battery top cover, and columnar sealing rubber particles are also provided. After the liquid injection is completed, seal the liquid injection hole with sealing rubber particles to prevent the electrolyte in the battery cell from flowing out. However, since the length of the sealant particles is greater than the thickness of the battery top cover, after the liquid injection hole is blocked, the capacity in the battery core will be occupied, so when the liquid injection volume in the battery core is fixed, it is necessary to increase the battery core capacity. The height of the battery increases the volume of the battery. At the same time, the sealant particles also have the risk of interfering with the battery electrode assembly, which affects the safety of the battery.

Contents of the invention

The object of the present invention is to provide a battery top cover and a battery, which can reduce the volume of the battery while ensuring the capacity of the battery core, and improve the safety of the battery.

For reaching this purpose, the present invention adopts following technical scheme:

battery top cover, including:

The top cover body, the top cover body is provided with installation holes;

A conductive component, the conductive component includes a pole, the pole is passed through the installation hole, the pole is provided with a liquid injection hole, and the liquid injection hole runs through both ends of the pole;

A seal, the seal can be blocked in the liquid injection hole, and the length of the seal in the first direction is smaller than the length of the pole in the first direction, and the first direction is parallel in the axial direction of the liquid injection hole;

A sealing ring, the sealing ring is sheathed outside the pole, and is used to seal the space between the pole and the installation hole.

Optionally, a baffle assembly is also included, the baffle assembly includes a baffle and a connecting piece, the baffle is arranged at intervals from the liquid injection hole along the axial direction of the liquid injection hole, and a plurality of connecting pieces are supported at intervals Between the baffle plate and the edge of the liquid injection hole.

Optionally, the sealing member includes a first sealing part and a second sealing part connected, the second sealing part is located between the first sealing part and the baffle, and the bottom of the second sealing part The end protrudes from the liquid injection hole, and the second sealing part is spaced apart from the connecting piece.

Optionally, the cross-sectional dimension of the first sealing part along the radial direction of the liquid injection hole is larger than the cross-sectional dimension of the second sealing part along the radial direction of the liquid injection hole, and the angle of the bottom end of the second sealing part is set as Chamfer.

Optionally, the bottom end of the second sealing portion abuts against the baffle.

Optionally, a guide protrusion is provided on the side of the baffle facing the liquid injection hole, and the bottom end of the second sealing part is spaced from the guide protrusion or abuts against the guide protrusion. raised.

Optionally, the guide protrusion is arranged coaxially with the liquid injection hole.

Optionally, a sealing sheet is also included, and a connected first liquid injection hole section and a second liquid injection hole section are arranged through the pole, and the first liquid injection hole section is located at a position away from the second liquid injection hole section. On one side of the battery core, the sealing piece is accommodated in the first liquid injection hole section, and the sealing piece is connected to the pole, and the sealing piece is inserted in the second liquid injection hole section.

Optionally, the aperture diameter of the first liquid injection hole section is larger than the aperture diameter of the second liquid injection hole section; and/or, the aperture diameter of the first liquid injection hole section is towards the second liquid injection hole section gradually decreases in the direction of .

Optionally, the sealing sheet is connected to the pole by welding, and a gap is provided between the sealing sheet and the sealing member.

Optionally, one end of the pole near the battery core is provided with a guide groove, the guide groove communicates with the liquid injection hole, the baffle assembly is located in the guide groove, and the connecting piece and the The groove walls of the guide groove are arranged at intervals.

Optionally, the guide groove includes a connected first groove section and a second groove section, the second groove section is located on a side of the guide groove close to the battery core, and the first groove section is located on the The side of the guide groove away from the battery core, the inner diameter of the second groove segment is larger than the inner diameter of the first groove segment.

Optionally, the conductive component further includes a terminal, the terminal is arranged on the side of the top cover body away from the battery core, the terminal is provided with a connection hole, the pole is passed through the connection hole, and The surface of the pole is flush with the surface of the terminal, and the battery top cover further includes a first insulator interposed between the terminal and the top cover body.

Optionally, a weld groove is formed at the connection between the pole and the terminal, and the pole and the terminal are connected by welding.

The battery includes a battery case and the above-mentioned battery top cover, wherein the battery top cover is arranged on the battery case.

Beneficial effects of the present invention:

The battery top cover provided by the present invention includes a top cover body, a conductive component, a seal and a sealing ring, and the pole is passed through the installation hole on the top cover body to lead out the voltage in the battery, which is a necessary structure of the battery. During liquid injection, the electrolyte enters the battery core through the liquid injection hole on the pole. After the liquid injection is completed, use a seal to block the liquid injection hole, and the length of the seal in the first direction is less than that of the pole in the first direction. length. The battery top cover not only prevents the seal from occupying the capacity of the battery core by opening a liquid injection hole on the pole, so that the volume of the battery is reduced, but also prevents the seal from interfering with the electrode assembly, thereby ensuring battery safety.

The battery provided by the present invention includes the battery casing and the above-mentioned battery top cover, and the liquid injection hole is arranged on the pole, which prevents the sealing member from occupying the capacity of the battery core, and reduces the volume of the battery while ensuring the capacity of the battery core , and prevent the sealing member from interfering with the battery electrode assembly, thereby improving the safety of the battery.

Description of drawings

FIG. 1 is an exploded view of a battery top cover provided by an embodiment of the present invention;

Fig. 2 is a partial structural schematic diagram of a battery top cover provided by an embodiment of the present invention;

Fig. 3 is a cross-sectional view of a battery top cover provided by an embodiment of the present invention;

Fig. 4 is a partial enlarged view of A in Fig. 3 .

In the picture:

1. Top cover body; 11. Mounting hole;

2. Conductive component; 21. Pole; 211. Liquid injection hole; 212. Guide groove; 22. Terminal; 23. Welding groove;

3. Baffle assembly; 31. Baffle; 32. Connector;

41. Sealing element; 411. First sealing part; 412. Second sealing part; 42. Sealing sheet;

51. The first insulating part; 52. The second insulating part; 521. The retaining strip;

6. Sealing ring.

Detailed ways

Embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar components or components having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a mechanical connection. A connection can also be an electrical connection, a direct connection, or an indirect connection through an intermediary, or an internal connection between two elements or an interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first feature and the second feature, or include the first feature Not in direct contact with the second feature but through another feature therebetween. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

As shown in FIGS. 1-4 , this embodiment provides a battery top cover, which includes a top cover body 1 , a conductive component 2 , a sealing member 41 and a sealing ring 6 . The top cover body 1 is provided with a mounting hole 11, the conductive component 2 includes a pole 21, and the pole 21 penetrates the mounting hole 11, and the pole 21 is provided with a liquid injection hole 211, and the liquid injection hole 211 runs through both ends of the pole 21. end. The sealing member 41 can block the liquid injection hole 211 , and the length of the sealing member 41 in the first direction is smaller than the length of the pole 21 in the first direction, and the first direction is parallel to the axial direction of the liquid injection hole 211 . The sealing ring 6 is sleeved outside the pole 21 to seal the gap between the pole 21 and the mounting hole 11 to prevent the electrolyte from leaking from the gap between the two, and to strengthen the pole 21 and the top cover body 1 between the sealing effect.

The pole 21 passes through the installation hole 11 on the top cover body 1 to lead out the voltage in the battery, which is a necessary structure of the battery. During liquid injection, the electrolyte enters the battery core through the liquid injection hole 211 on the pole 21. After the liquid injection is completed, the seal 41 is used to block the liquid injection hole 211, and the length of the seal 41 in the first direction is shorter than that of the pole. 21 the length in the first direction. The battery top cover not only prevents the sealing member 41 from occupying the capacity of the battery core by opening the liquid injection hole 211 on the pole 21, so that the volume of the battery is reduced, but also prevents the sealing member 41 from interfering with the electrode assembly, ensuring battery safety. . In this embodiment, the sealing ring 6 is made of rubber material, and the sealing effect is good.

Further, as shown in FIG. 4 , the battery top cover also includes a baffle assembly 3 , the baffle assembly 3 includes a baffle 31 and a connecting piece 32 , and the baffle 31 is spaced apart from the liquid injection hole 211 along the axial direction of the liquid injection hole 211 It is provided that a plurality of connecting pieces 32 are spaced and supported between the baffle plate 31 and the edge of the liquid injection hole 211 . During liquid injection, the electrolyte flows out of the liquid injection hole 211 and impacts on the baffle plate 31, then flows out from the gaps between the plurality of connectors 32, and enters the battery core, thereby avoiding the impact on the battery core during liquid injection. The diaphragm of the battery cell is protected. In this embodiment, the surface of the baffle plate 31 is perpendicular to the axial direction of the liquid injection hole 211, which can effectively block the impact of the electrolyte. The connecting piece 32 is block-shaped and integrally formed with the baffle plate 31 .

Further, a guide protrusion is provided on a side of the baffle plate 31 facing the liquid injection hole 211 . When injecting liquid, the electrolyte flows out of the liquid injection hole 211 and impacts on the diversion protrusion of the baffle 31, and then falls from the diversion protrusion to the surface of the baffle 31, and is released by the gaps between the plurality of connectors 32. out, thus completing the injection. The electrolyte flows to the surface of the baffle 31 through the diversion protrusions. Compared with directly hitting the surface of the baffle 31, the kinetic energy of the electrolyte is increased, and the flow speed is accelerated, which further improves the liquid injection efficiency of the battery. In this embodiment, the guide protrusion is arranged coaxially with the liquid injection hole 211, so that the electrolyte flowing out from the liquid injection hole 211 can flow through the guide protrusion smoothly. or cone-shaped structures.

Further, the corners on the baffle 31 are chamfered, so that the flow of the electrolyte on the baffle 31 is smoother and the flow speed is increased.

Further, as shown in FIG. 4 , the sealing member 41 includes a connected first sealing portion 411 and a second sealing portion 412 , the second sealing portion 412 is located between the first sealing portion 411 and the baffle plate 31 , and the second sealing portion 412 The bottom end protrudes from the liquid injection hole 211, and the second sealing part 412 is spaced apart from the connecting part 32. The first sealing part 411 of the sealing part 41 can block the liquid injection hole 211, and the second sealing part 412 is connected to the connecting part 32. The arrangement at intervals makes it convenient and smooth for the sealing member 41 to be inserted into the liquid injection hole 211 . In this embodiment, the cross-sectional dimension of the first sealing portion 411 along the radial direction of the liquid injection hole 211 is larger than the cross-sectional dimension of the second sealing portion 412 along the radial direction of the liquid injection hole 211, and the bottom corner of the second sealing portion 412 is chamfered. . Exemplarily, the sealing member 41 is sealing rubber particles.

Furthermore, the bottom end of the second sealing portion 412 abuts against the baffle plate 31 , so that the sealing member 41 is in a stable position and is not easy to move along its axial direction in the liquid injection hole 211 . In this embodiment, the bottom end of the second sealing portion 412 abuts against the flow guiding protrusion. In other embodiments, if the flow guiding protrusion is not coaxial with the liquid injection hole 211 , the bottom end of the second sealing portion 412 is spaced apart from the flow guiding protrusion.

Further, the battery top cover also includes a sealing sheet 42, the pole 21 is penetrated with a connected first liquid injection hole section and a second liquid injection hole section, the first liquid injection hole section and the second liquid injection hole section form the above-mentioned Liquid injection hole 211, the first liquid injection hole section is located on the side of the second liquid injection hole section away from the battery core, the sealing sheet 42 is accommodated in the first liquid injection hole section, and the sealing sheet 42 is connected to the pole 21, the sealing member 41 is inserted in the second liquid injection hole section, and the sealing piece 42 in the first liquid injection hole section and the seal 41 in the second liquid injection hole section perform double sealing on the liquid injection hole 211 to avoid electrolysis in the battery core. The liquid overflows, and the inside of the battery core will generate gas during the use of the battery. The sealing sheet 42 sealed outside the sealing member 41 can prevent the sealing member 41 from being ejected from the liquid injection hole 211 by the gas pressure. In this embodiment, the material of the sealing sheet 42 is aluminum, which has good electrical conductivity and can assist the pole 21 to conduct electricity.

Further, the aperture diameter of the first liquid injection hole section is larger than the aperture diameter of the second liquid injection hole section, so that the electrolyte can flow into the liquid injection hole 211 more accurately during liquid injection. In this embodiment, the first liquid injection hole section The diameter of the hole decreases gradually toward the second liquid injection hole section, which acts as a flow guide.

Further, as shown in FIG. 4 , the sealing sheet 42 is connected to the pole 21 by welding, and a gap is provided between the sealing sheet 42 and the sealing member 41 to accommodate part of the gas generated during the welding process, so as to avoid the leakage of the sealing sheet. 42 is ejected from the liquid injection hole 211.

Further, as shown in FIGS. 2-4 , the end of the pole 21 close to the battery core is provided with a guide groove 212, the guide groove 212 communicates with the liquid injection hole 211, the baffle assembly 3 is located in the guide groove 212, and the connector 32 It is spaced apart from the groove wall of the guide groove 212 . When the electrolyte flows out from the gaps between the plurality of connectors 32 , it will flow along the groove wall of the guide groove 212 , so that the electrolyte that enters the battery core can be collected quickly and the injection time can be shortened.

Further, the guide groove 212 includes a connected first groove section and a second groove section, the second groove section is located on the side of the guide groove 212 close to the battery core, the first groove section is located on the side of the guide groove 212 away from the battery core, and the second groove section is located on the side of the guide groove 212 away from the battery core. The inner diameter of the second groove section is larger than that of the first groove section, so that the weight of the battery can be reduced on the basis of expanding the battery capacity.

Further, the conductive component 2 also includes a terminal 22, which is arranged on the side of the top cover body 1 away from the battery core, the terminal 22 is provided with a connection hole, the pole 21 is passed through the connection hole, and the surface of the pole 21 is in contact with the terminal. The surfaces of 22 are flush, and the terminal 22 with a larger cross-sectional area serves as an electrical contact for connecting the load to the battery, and the pole 21 with a smaller cross-sectional area assists in outputting electric energy.

Further, the battery top cover also includes a first insulating member 51 , which is sandwiched between the terminal 22 and the top cover body 1 , so as to prevent the battery short circuit caused by the contact between the top cover body 1 and the terminal 22 having conductive properties. In this embodiment, the first insulating member 51 is provided with a groove, and the terminal 22 is accommodated in the groove, and only the top surface is exposed for contacting the load. Exemplarily, the first insulating member 51 is upper plastic.

Further, a welding groove 23 is formed at the junction of the pole 21 and the terminal 22, and the pole 21 and the terminal 22 are connected by welding, and the operation is performed in the welding groove 23 during welding, which can compensate for the height of the protrusion generated by welding and avoid The flatness of the surface of the terminal 22 and the pole 21 is affected.

Further, the battery top cover also includes a second insulator 52, the second insulator 52 is arranged on the side of the top cover body 1 close to the battery core, the second insulator 52 is provided with a second escape hole, the second escape hole A bar 521 is provided at the edge of the pole. The pole 21 includes a cylindrical part and a raised part. The raised part is arranged around the circumference of the cylindrical part. The rising part passes through the second avoidance hole and abuts against the blocking bar 521 . The second insulator 52 isolates the top cover body 1 with conductive properties from the battery core to avoid battery leakage. At the same time, the pole 21 abuts against the blocking strip 521 on the second insulator 52 , so that the position of the pole 21 relative to the first insulator 51 and the second insulator 52 is fixed. In this embodiment, the guide groove 212 is disposed on one end of the cylinder portion close to the raised portion, and the raised portion is shaped like a flange of the cylinder portion. Exemplarily, the second insulating member 52 is lower plastic.

This embodiment also provides a battery, including a battery case and the above-mentioned battery top cover, and the battery top cover is arranged on the battery case. The liquid injection hole 211 is arranged on the pole 21, which prevents the sealing member 41 from occupying the capacity of the battery core, reduces the volume of the battery while ensuring the capacity of the battery core, and prevents the sealing member 41 from interfering with the battery electrode assembly, improving the Battery safety.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (15)

1. Battery top cap, its characterized in that includes:

the novel top cover comprises a top cover body (1), wherein a mounting hole (11) is formed in the top cover body (1);

the conductive assembly (2), the conductive assembly (2) comprises a pole (21), the pole (21) is penetrated through the mounting hole (11), the pole (21) is provided with a liquid injection hole (211), and the liquid injection hole (211) penetrates through two ends of the pole (21);

a seal (41), wherein the seal (41) can be plugged in the liquid injection hole (211), and the length of the seal (41) in a first direction is smaller than the length of the pole (21) in the first direction, and the first direction is parallel to the axial direction of the liquid injection hole (211);

the sealing ring (6) is sleeved outside the pole (21) and is used for sealing the interval between the pole (21) and the mounting hole (11).

2. The battery top cover according to claim 1, further comprising a baffle assembly (3), wherein the baffle assembly (3) comprises a baffle plate (31) and connecting pieces (32), the baffle plate (31) is arranged at intervals from the liquid injection hole (211) along the axial direction of the liquid injection hole (211), and a plurality of connecting pieces (32) are supported between the baffle plate (31) and the edge of the liquid injection hole (211) at intervals.

3. The battery top cover according to claim 2, wherein the sealing member (41) comprises a first sealing portion (411) and a second sealing portion (412) which are connected, the second sealing portion (412) is located between the first sealing portion (411) and the baffle plate (31), the bottom end of the second sealing portion (412) protrudes out of the liquid injection hole (211), and the second sealing portion (412) is arranged at a distance from the connecting member (32).

4. A battery top cover according to claim 3, wherein the cross-sectional dimension of the first sealing portion (411) along the radial direction of the liquid injection hole (211) is larger than the cross-sectional dimension of the second sealing portion (412) along the radial direction of the liquid injection hole (211), and the corners of the bottom end of the second sealing portion (412) are provided as chamfers.

5. A battery top cover according to claim 3, wherein the bottom end of the second sealing portion (412) abuts against the baffle plate (31).

6. A battery top cover according to claim 3, wherein a guide projection is provided on a side of the baffle plate (31) facing the liquid injection hole (211), and the bottom end of the second sealing portion (412) is spaced from or abuts against the guide projection.

7. The battery top cover according to claim 6, wherein the guide projection is provided coaxially with the liquid injection hole (211).

8. The battery top cover according to any one of claims 1 to 7, further comprising a sealing sheet (42), wherein the pole (21) is provided with a first liquid injection hole section and a second liquid injection hole section connected with each other in a penetrating manner, the first liquid injection Kong Duanwei is arranged on one side of the second liquid injection hole section, which is away from the battery core, the sealing sheet (42) is accommodated in the first liquid injection hole section, the sealing sheet (42) is connected to the pole (21), and the sealing piece (41) is inserted into the second liquid injection hole section.

9. The battery top cover of claim 8, wherein the first fill hole section has a larger pore size than the second fill hole section; and/or the aperture of the first liquid injection hole section gradually decreases in the direction towards the second liquid injection hole section.

10. The battery top cover according to claim 8, wherein the sealing sheet (42) and the pole (21) are connected by welding, and a gap is provided between the sealing sheet (42) and the sealing member (41).

11. The battery top cover according to any one of claims 2 to 7, wherein a guide groove (212) is formed in one end, close to the battery core, of the pole (21), the guide groove (212) is communicated with the liquid injection hole (211), the baffle assembly (3) is located in the guide groove (212), and the connecting piece (32) is arranged at a distance from a groove wall of the guide groove (212).

12. The battery top cover of claim 11, wherein the guide slot (212) comprises a first slot section and a second slot section in communication, the second slot section being located on a side of the guide slot (212) closer to the battery cell, the first slot section being located on a side of the guide slot (212) farther from the battery cell, the second slot section having an inner diameter greater than an inner diameter of the first slot section.

13. The battery top cover according to any one of claims 1-7, wherein the conductive assembly (2) further comprises a terminal (22), the terminal (22) is arranged on one side of the top cover body (1) facing away from the battery core, the terminal (22) is provided with a connecting hole, the pole (21) is arranged in the connecting hole in a penetrating way, the surface of the pole (21) is flush with the surface of the terminal (22), and the battery top cover further comprises a first insulating piece (51), and the first insulating piece (51) is clamped between the terminal (22) and the top cover body (1).

14. The battery top cover according to claim 13, wherein a weld groove (23) is formed at the junction of the pole (21) and the terminal (22), and the pole (21) and the terminal (22) are connected by welding.

15. A battery comprising a battery housing and a battery top cover as claimed in any one of claims 1 to 14, wherein the battery top cover is provided on the battery housing.

Images