CN219892283U - Battery cover plate assembly, cylindrical battery and battery module - Google Patents

Abstract

The utility model provides a battery cover plate assembly, a cylindrical battery and a battery module, which comprises a cover plate and a pole, wherein the pole is fixedly arranged on the cover plate, a mounting hole is formed in the axial line of the pole, a plastic hot-melt column is fixedly arranged in the mounting hole, the hot-melt column extends out of the top surface of the pole, and the hot-melt column is used for penetrating through a connecting hole on a bus bar and fixedly connecting the pole with the bus bar in a hot-melt mode. After the battery cover plate component disclosed by the utility model is subjected to thermal deformation and cooling through the hot-melt column, the bus bar and the pole are pressed and fixed, so that the bus bar and the pole are quickly connected, the assembly efficiency is high, in addition, the thermal deformation temperature of the hot-melt column is lower than the welding temperature, the thermal deformation of the bus bar can be avoided, the reliability of the contact surface of the bus bar and the pole is ensured, and the overcurrent capacity of the pole and the bus bar is improved.

Description

Battery cover plate assembly, cylindrical battery and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cover plate assembly, a cylindrical battery and a battery module.

Background

In the prior art, in the grouping application, sheet-shaped bus bars are mostly used for carrying out parallel connection and serial connection among batteries. When the sheet-shaped bus bars are used for electric connection, the requirement on the battery assembly process is high, so that the battery assembly process can have high overcurrent capacity after the battery assembly process is ensured to be grouped.

In the prior art, as disclosed in CN214848948U, a battery pack and a battery pack with a low power top bus bar are disclosed that employ a metal welding process to electrically connect the bus bar to the battery post. Because the sheet busbar is when welding with the battery post, need cover the busbar on the battery post, in welding process, because the welding temperature is too high, the busbar takes place to warp easily, this will lead to there being the contact clearance between busbar and the battery post, has the postweld rosin joint problem, leads to the overflow ability to reduce. In addition, the bus bar is required to be fully welded in the welding process of the bus bar and the pole, and the welding power cannot be excessively high so as to prevent the bus bar or the pole from melting, so that the welding time of the bus bar and the pole is longer, and the problems of low efficiency and high cost in realizing the welding of the bus bar and the battery pole through a metal welding process are caused.

Disclosure of Invention

In view of the above, the utility model provides a battery cover plate assembly, a cylindrical battery and a battery module, which are used for solving the problems of cold joint, low overcurrent capability and low assembly efficiency of the cylindrical battery and the busbar which are electrically connected through a metal welding process.

The technical scheme of the utility model is realized as follows:

in one aspect, the utility model provides a battery cover plate assembly, which comprises a cover plate and a pole, wherein the pole is fixedly arranged on the cover plate, a mounting hole is formed in the axial line of the pole, a plastic hot-melt column is fixedly arranged in the mounting hole, the hot-melt column extends out of the top surface of the pole, and the hot-melt column is used for penetrating through a connecting hole on a bus bar and fixedly connecting the pole with the bus bar in a hot-melt manner.

On the basis of the technical scheme, preferably, the cover plate is made of plastic, a through hole is formed in the center of the cover plate, the pole is fixedly arranged in the through hole, the bottom surface of the pole is provided with a containing groove communicated with the mounting hole, one end of the hot-melt pole, which is positioned on the bottom surface of the pole, extends outwards to form a connecting part, and the connecting part is formed in the containing groove and integrally connected with the cover plate.

Further, preferably, an annular groove is provided on the outer peripheral side of the pole, and a first annular protrusion connected with the annular groove is provided on the inner wall of the through hole.

Still further, preferably, the top surface of the cover plate is provided with a first groove, the bottom surface of the cover plate is provided with a second groove, the first annular protrusion is formed between the first groove and the second groove, at least a portion of the top of the pole is disposed in the first groove, and at least a portion of the bottom of the pole is disposed in the second groove.

On the basis of the technical scheme, preferably, a third groove coaxial with the mounting hole is formed in the top surface of the pole, and a second annular protrusion connected with the third groove is arranged on the peripheral wall of the hot melting pole.

On the basis of the technical scheme, preferably, an annular slot is formed in the outer peripheral side of the bottom surface of the cover plate, and the annular slot is used for inserting the battery shell and fixedly connecting the cover plate with the battery shell in a hot melting mode.

On the basis of the technical scheme, the current collecting plate is preferably further provided with a current collecting plate, one face of the current collecting plate is connected with the cover plate through a plurality of elastic pieces, the other face of the current collecting plate is used for being connected with the pole lug at the end part of the winding core, a current guiding piece is fixedly arranged at the center of one face of the current collecting plate, which faces the cover plate, and when the current collecting plate approaches the cover plate, the current guiding piece is used for being connected with the pole column.

Further, preferably, a plurality of convex hulls are arranged on two side surfaces of the collecting disc, the convex hulls are arranged at the edge of the collecting disc, and the convex hulls are uniformly distributed along the circumferential direction of the collecting disc.

On the other hand, the utility model also discloses a cylindrical battery, which comprises a shell, a winding core and a battery cover plate assembly, wherein the winding core is arranged in the shell, the two battery cover plate assemblies are respectively positioned at two open ends of the shell, the cover plate is fixedly connected with the shell, and the pole is electrically connected with the pole lug at the end part of the winding core.

The utility model also discloses a battery module, which comprises the cylindrical battery.

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

(1) According to the battery cover plate assembly disclosed by the utility model, the plastic hot-melt column is fixedly arranged at the central axis of the pole, and extends out of the top surface of the pole, after the cylindrical battery formed by assembling the battery cover plate assembly is assembled, the busbar with the connecting holes is sleeved on the hot-melt column in advance, and after the thermal deformation and cooling of the hot-melt column, the busbar and the pole are tightly pressed and fixed, so that the busbar and the pole are quickly connected, the assembly efficiency is high, in addition, the thermal deformation temperature of the hot-melt column is lower than the welding temperature, the thermal deformation of the busbar can be avoided, the reliability of the contact surface of the busbar and the pole is ensured, and the overcurrent capacity of the pole and the busbar is improved;

(2) The cover plate is made of plastic, the accommodating groove communicated with the mounting hole is formed in the bottom surface of the pole, the integral injection molding of the pole and the cover plate can be realized through an insert injection molding process, the integral molding of the cover plate and the hot melting column is realized, and the structural strength and the sealing reliability of the whole cover plate assembly are improved;

(3) The annular groove is formed in the outer peripheral side of the pole, the first annular protrusion connected with the annular groove is arranged on the inner wall of the through hole, so that embedded connection of the cover plate and the pole can be realized, and the sealing reliability of the joint of the cover plate and the pole is improved;

(4) The battery shell can be inserted into the annular slot by arranging the annular slot on the outer periphery of the bottom surface of the cover plate, and the cover plate made of plastic material is fixedly connected with the battery shell by a hot melting process, so that the production cost of the cylindrical battery is reduced relative to a metal welding process;

(5) By arranging the elastic piece between the current collecting disc and the cover plate and arranging the flow guide piece on one surface of the current collecting disc, which faces the cover plate, when the current collecting disc is pressed to approach the cover plate, the flow guide piece is used for being connected with the pole, and by adopting the structure, welding is not needed between the current collecting disc and the pole and between the current collecting disc and the pole, so that links of ultrasonic welding and laser welding are reduced, the cost is greatly saved, and the efficiency is improved;

(6) Through design convex hull on the current collecting tray, increase the frictional force between current collecting tray and the core of rolling up, effectively prevent the rotation of current collecting tray and core of rolling up, can also increase the area of contact of current collecting tray and utmost point ear simultaneously, ensure effective overcurrent.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing a first perspective structure of a battery cover assembly according to the present disclosure;

FIG. 2 is a schematic view of a second perspective of the battery cover assembly of the present disclosure;

FIG. 3 is a schematic view of a first perspective exploded view of the disclosed battery cover assembly;

FIG. 4 is a schematic view of a second perspective exploded view of the disclosed battery cover assembly;

FIG. 5 is a cross-sectional view of a battery cover assembly of the present disclosure;

fig. 6 is a schematic perspective view of a cylindrical battery according to the present disclosure;

reference numerals:

1. a battery cover plate assembly; 11. a cover plate; 12. a pole; 120. a mounting hole; 13. a hot melt column; 110. a through hole; 121. a receiving groove; 131. a connection part; 122. an annular groove; 111. a first annular projection; 112. a first groove; 113. a second groove; 123. a third groove; 132. a second annular projection; 114. an annular slot; 14. a collecting tray; 15. an elastic member; 141. a flow guide; 142. convex hulls; 2. a housing; 3. and (5) winding the core.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As in the prior art, when the busbar is welded to the battery post, the busbar is easily deformed due to the too high welding temperature, which results in a contact gap between the busbar and the battery post, and a post-welding cold joint problem occurs, resulting in a reduced overcurrent capacity. In addition, the bus bar is required to be fully welded in the welding process of the bus bar and the pole, and the welding power cannot be excessively high so as to prevent the bus bar or the pole from melting, so that the welding time of the bus bar and the pole is longer, and the problems of low efficiency and high cost in realizing the welding of the bus bar and the battery pole through a metal welding process are caused.

To solve the above problems, the present utility model provides a battery cover assembly 1, and referring to fig. 1 and fig. 2, the battery cover assembly 1 disclosed in this embodiment includes a cover 11 and a pole 12, the pole 12 is fixedly disposed on the cover 11, and it is understood that the pole 12 is electrically isolated from the cover 11. The pole 12 is provided with a mounting hole 120 at the axial lead, a plastic hot-melt column 13 is fixedly arranged in the mounting hole 120, the hot-melt column 13 extends out of the top surface of the pole 12, the hot-melt column 13 is used for penetrating through a connecting hole on a bus bar, and the pole 12 is fixedly connected with the bus bar in a hot-melt mode.

By adopting the technical scheme, the cylindrical batteries formed by assembling the battery cover plate assembly 1 disclosed by the embodiment are assembled, and after being grouped, the cylindrical batteries can be processed into the busbar with the connecting holes in advance according to the spacing between the cylindrical battery poles 12 on the battery module, when the busbar is welded, the connecting holes on the busbar are sleeved on the hot-melt pole 13, so that the bottom surface of the busbar is attached to the bottom surface of the pole 12, the hot-melt pole 13 is heated to deform, the hot-melt pole 13 extends to the periphery along the connecting holes by applying pressure, after thermal deformation and cooling, the busbar and the pole 12 are tightly pressed and fixed through the hot-melt pole 13, thereby realizing the quick connection of the busbar and the pole 12, having high assembly efficiency, and in addition, the thermal deformation temperature of the hot-melt pole 13 is lower than the welding temperature, avoiding the thermal deformation of the busbar, ensuring the reliability of the contact surface of the busbar and the pole 12, and improving the overcurrent capacity of the pole 12.

In order to realize the effective assembly of the hot-melt column 13 and the pole 12, the present embodiment shows a preferred embodiment, specifically, referring to fig. 3-5, in this embodiment, the cover plate 11 is made of plastic material, a through hole 110 is provided at the center of the cover plate 11, the pole 12 is fixedly disposed in the through hole 110, a receiving groove 121 communicated with the mounting hole 120 is provided at the bottom surface of the pole 12, a connecting portion 131 is formed by extending one end of the hot-melt column 13 located at the bottom surface of the pole 12 outwards, and the connecting portion 131 is formed in the receiving groove 121 and integrally connected with the cover plate 11. In this embodiment, a plurality of accommodating grooves 121 may be disposed, and the plurality of accommodating grooves 121 are disposed at equal intervals around the central axis of the pole 12, so that the molded hot-melt column 13 may have more connecting portions 131 and be connected with the cover plate 11, and the connection strength between the cover plate 11 and the hot-melt column 13 is improved.

In a specific implementation, the pole 12 made of metal is placed in the mold for forming the cover plate 11 and the hot-melt column 13, and through an injection molding process, the integral injection molding of the pole 12 and the cover plate 11 is realized, meanwhile, in the flowing process, the accommodating groove 121 and the mounting hole 120 are filled with plastic, finally, the hot-melt column 13 integrated with the cover plate 11 is formed, the cover plate 11 and the hot-melt column 13 are integrally formed, and meanwhile, the pole 12 is wrapped in the hot-melt column 13, so that the structural strength of the whole cover plate 11 assembly is improved, and meanwhile, the sealing reliability among the cover plate 11, the pole 12 and the hot-melt column 13 is improved.

In order to make the connection strength between the cover plate 11 and the pole 12 stronger, the present embodiment is provided with an annular groove 122 on the outer peripheral side of the pole 12, and the inner wall of the through hole 110 is provided with a first annular protrusion 111 connected with the annular groove 122. Therefore, when in injection molding, the plastic is filled in the annular groove 122, so that the first annular protrusion 111 is formed, the first annular protrusion 111 and the annular groove 122 are tightly matched and connected, the sealing reliability of the joint of the cover plate 11 and the pole 12 is improved, and the connection structural strength of the cover plate 11 and the pole 12 is also improved.

In order to further improve the tightness between the pole 12 and the cover plate 11, in this embodiment, a first groove 112 is provided on the top surface of the cover plate 11, a second groove 113 is provided on the bottom surface of the cover plate 11, a first annular protrusion 111 is formed between the first groove 112 and the second groove 113, at least a portion of the top of the pole 12 is disposed in the first groove 112, and at least a portion of the bottom of the pole 12 is disposed in the second groove 113. By the arrangement, the connecting contact area between the cover plate 11 and the pole 12 can be increased through the first groove 112 and the second groove 113 in the injection molding process, so that the connecting position path between the pole 12 and the cover plate 11 can be prolonged, and the sealing reliability can be further improved.

In order to avoid the hot-melt pole 13 from being separated from the pole 12, the top surface of the pole 12 is provided with a third groove 123 coaxial with the mounting hole 120, and the outer peripheral wall of the hot-melt pole 13 is provided with a second annular protrusion 132 connected with the third groove 123. Therefore, the hot-melt column 13 can limit the downward movement of the hot-melt column 13 relative to the pole 12 through the cooperation of the second annular protrusion 132 and the third groove 123 above, and simultaneously, the hot-melt column 13 can limit the upward movement of the hot-melt column 13 relative to the pole 12 through the cooperation of the connecting part 131 and the accommodating groove 121, so that the whole hot-melt column 13 is limited in the pole 12, and the relative position between the hot-melt column 13 and the pole 12 is ensured to be fixed.

Because the cover plate 11 disclosed in this embodiment is made of plastic material, metal welding cannot be performed between the cover plate 11 and the battery case 2, in order to realize the fixed connection between the cover plate 11 and the battery case 2, in this embodiment, the battery case 2 can be inserted into the annular slot 114 by arranging the annular slot 114 on the outer peripheral side of the bottom surface of the cover plate 11, and the fixed connection between the cover plate 11 made of plastic material and the battery case 2 is realized by a hot melting process, so that the production cost of the cylindrical battery is reduced relative to the metal welding process.

In order to realize connection between the pole 12 and the winding core 3, the battery cover plate assembly 1 of this embodiment further includes a current collecting plate 14, one surface of the current collecting plate 14 is connected with the cover plate 11 through a plurality of elastic members 15, the other surface of the current collecting plate 14 is used for being connected with the tab at the end of the winding core 3, a current guiding member 141 is fixedly arranged at the center of one surface of the current collecting plate 14 facing the cover plate 11, and when the current collecting plate 14 approaches the cover plate 11, the current guiding member 141 is used for being connected with the pole 12.

By adopting the technical scheme, after the winding core 3 is put into the shell, the current collecting disc 14 is inserted into the shell 2, when the current collecting disc 14 is pressed to approach the cover plate 11, the current guide member 141 is used for being connected with the pole 12, and meanwhile, the current collecting disc 14 is contacted with the pole lug at the end part of the winding core 3, so that the winding core 3 and the pole 12 are electrically connected through the current collecting disc 14. By the aid of the structure, welding is not needed between the current collecting disc 14 and the pole 12 and between the current collecting disc and the pole lugs, links of ultrasonic welding and laser welding are reduced, cost is saved greatly, and efficiency is improved.

It is noted that the elastic members 15 are springs made of insulating materials, and the elastic members 15 are equally spaced around the axis of the collecting tray 14, so as to ensure stable movement of the collecting tray 14 when pressed. In this embodiment, the flow guiding member 141 is made of a cylindrical material, the size of the flow guiding member 141 is equal to the size of the pole 12, and in addition, the bottom surface of the pole 12 extends out of the bottom surface of the cover plate 11 by 0.5mm-1mm, so that when the compression elastic member 15 approaches the cover plate 11, the flow guiding member 141 can be ensured to contact with the bottom surface of the pole 12, and the poor contact phenomenon is avoided.

Further, a plurality of convex hulls 142 are disposed on both sides of the collecting tray 14, the convex hulls 142 are disposed at edges of the collecting tray 14, and the convex hulls 142 are uniformly distributed along the circumference of the collecting tray 14. Therefore, after the current collecting disc 14 and the lugs are pressed, the positions of the lugs corresponding to the convex hulls 142 are pressed out of the pits, the convex hulls 142 after being pressed out of the pits can increase friction between the current collecting disc 14 and the lugs, play a role in assisting in pressing the current collecting disc 14, effectively prevent the current collecting disc 14 and the winding core 3 from rotating, meanwhile, can increase the contact area between the current collecting disc 14 and the lugs, ensure that the current collecting disc 14 effectively overflows, and can improve the heat dissipation capacity of the current collecting disc 14.

The utility model also discloses a cylindrical battery, which is shown by referring to fig. 6, and comprises a shell 2, a winding core 3 and a battery cover plate assembly 1, wherein the winding core 3 is arranged in the shell 2, the battery cover plate assembly 1 is provided with two battery cover plates, the battery cover plate assembly 1 is respectively positioned at two open ends of the shell 2, a cover plate 11 is fixedly connected with the shell 2, and a pole post 12 is electrically connected with a pole lug at the end part of the winding core 3. When the cylindrical battery is assembled, the winding core 3 is inserted into the shell 2, then the two battery cover plate assemblies 1 are respectively inserted into the two opening ends of the shell 2, then pressure is applied to the middle of the shell 2, after the cover plate 11 is connected with the shell 2, the cover plate 11 is connected with the shell 2 through a hot melting process, the cover plate 11 made of plastic materials is fixedly connected with the battery shell 2 through the hot melting process, and compared with a metal welding process, the production cost of the cylindrical battery is reduced.

The utility model also discloses a battery module, which comprises a plurality of cylindrical batteries. The plurality of cylindrical batteries are stacked and arranged, because the battery cover plate assembly 1 is used by the cylindrical batteries, when the plurality of cylindrical batteries are connected in series and parallel, the busbar sleeve with the connecting holes can be arranged on the hot-melt column 13 in advance, after the hot-melt column 13 is subjected to thermal deformation and cooling, the busbar and the pole 12 are pressed and fixed, so that the busbar and the pole 12 are quickly connected, the assembly efficiency is high, in addition, the thermal deformation temperature of the hot-melt column 13 is lower than the welding temperature, the thermal deformation of the busbar can be avoided, the reliability of the contact surface of the busbar and the pole 12 is ensured, and the overcurrent capacity of the pole 12 and the busbar is improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. A battery cover assembly comprising a cover plate (11) and a post (12), characterized in that: the utility model discloses a solar cell module, including apron (11), terminal (12), mounting hole (120) are provided with in terminal (12) axial lead department, mounting hole (120) internal fixation is provided with hot melt post (13) of plastic material, hot melt post (13) extend terminal (12) top surface, hot melt post (13) are used for passing the connecting hole on the busbar to make terminal (12) and busbar fixed connection through hot melt mode.

2. The battery cover assembly of claim 1, wherein: the cover plate (11) is made of plastic, a through hole (110) is formed in the center of the cover plate (11), the pole (12) is fixedly arranged in the through hole (110), a containing groove (121) communicated with the mounting hole (120) is formed in the bottom surface of the pole (12), a connecting portion (131) is formed in one end of the bottom surface of the pole (12) in an outward extending mode, and the connecting portion (131) is formed in the containing groove (121) and integrally connected with the cover plate (11).

3. The battery cover assembly of claim 2, wherein: the outer peripheral side of the pole (12) is provided with an annular groove (122), and the inner wall of the through hole (110) is provided with a first annular protrusion (111) connected with the annular groove (122).

4. The battery cover assembly of claim 3, wherein: the top surface of the cover plate (11) is provided with a first groove (112), the bottom surface of the cover plate (11) is provided with a second groove (113), a first annular protrusion (111) is formed between the first groove (112) and the second groove (113), at least one part of the top of the pole (12) is arranged in the first groove (112), and at least one part of the bottom of the pole (12) is arranged in the second groove (113).

5. The battery cover assembly of claim 2, wherein: the top surface of the pole (12) is provided with a third groove (123) coaxial with the mounting hole (120), and the peripheral wall of the hot melting column (13) is provided with a second annular protrusion (132) connected with the third groove (123).

6. The battery cover assembly of claim 2, wherein: the annular slot (114) is arranged on the outer peripheral side of the bottom surface of the cover plate (11), and the annular slot (114) is used for inserting the power supply shell (2) and enabling the cover plate (11) to be fixedly connected with the battery shell (2) through hot melting.

7. The battery cover assembly of claim 1, wherein: the solar battery further comprises a current collecting disc (14), one face of the current collecting disc (14) is connected with the cover plate (11) through a plurality of elastic pieces (15), the other face of the current collecting disc (14) is connected with the pole lugs at the end part of the winding core (3), a flow guiding piece (141) is fixedly arranged at the center of one face of the current collecting disc (14) towards the cover plate (11), and when the current collecting disc (14) approaches the cover plate (11), the flow guiding piece (141) is used for being connected with the pole column (12).

8. The battery cover assembly of claim 7, wherein: a plurality of convex hulls (142) are arranged on two side surfaces of the collecting disc (14), the convex hulls (142) are arranged at the edge of the collecting disc (14), and the convex hulls (142) are uniformly distributed along the circumferential direction of the collecting disc (14).

9. A cylindrical battery comprising a housing (2), a winding core (3) and a battery cover assembly according to any one of claims 1 to 8, characterized in that: the battery cover plate assembly is provided with two battery cover plates, the battery cover plates are respectively located at two opening ends of the shell (2), the cover plates (11) are fixedly connected with the shell (2), and the pole posts (12) are electrically connected with pole lugs at the end parts of the battery core (3).

10. A battery module, characterized in that; comprising a plurality of cylindrical batteries as claimed in claim 9.