Cover plate assembly, battery cell, battery and vehicle

Abstract

The utility model relates to the field of automobile parts, and provides a cover plate assembly, a battery cell, a battery and a vehicle, and the cover plate assembly comprises a welding part, upper plastic, a sealing ring, a top cover part, lower plastic and a pole. And the pole is arranged on the lower plastic. The upper plastic and the lower plastic are located on the two opposite sides of the top cover piece, and through holes are formed in the upper plastic, the top cover piece and the lower plastic. The welding part is provided with a welding part and a connecting part, a supporting part is arranged in the middle of the connecting part, the upper plastic, the top cover part and the lower plastic sleeve the connecting part and are located between the welding part and the supporting part, and one end, far away from the welding part, of the connecting part extends into the pole and is welded with the pole. The sealing ring is provided with a sealing part, the sealing ring is arranged on the peripheral face of the connecting part in a sleeving mode, and the sealing part is connected between the top cover piece and the supporting part in an abutting mode. The battery cell comprises a cover plate assembly, a shell and a pole core, the battery comprises a plurality of battery cells. The vehicle comprises a main body part and a battery cell or a battery, and the main body part is electrically connected with the battery cell or the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile parts, in particular to a cover plate assembly, an electric core, a battery and a vehicle. BACKGROUND

[0002] At present, power batteries have been widely used in automobiles, backup power systems and micro-grid energy storage systems. The battery cover plate assembly is an important part of the power battery. The existing cover plate assembly adopts a riveting process to rivet the gasket on the riveting block.

[0003] However, during the riveting process, due to the large riveting circle diameter, the area occupied by the riveting block is large, which limits the welding area of the gasket, thereby causing the electric core to have a small overcurrent area, the heat is not easy to conduct, and the electric core has poor heat dissipation effect. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a cover plate assembly, an electric core, a battery and a vehicle capable of improving the heat dissipation effect of the electric core.

[0005] An embodiment of the present application provides a cover plate assembly. The cover plate assembly comprises a welding piece, an upper plastic, a sealing ring, a top cover piece, a lower plastic and a pole. The pole is arranged on the lower plastic. The upper plastic and the lower plastic are located on opposite sides of the top cover piece. The upper plastic, the top cover piece and the lower plastic are all provided with through holes. The through holes of the upper plastic, the top cover piece and the lower plastic correspond to each other and form a group of holes. The welding piece is provided with a welding portion and a connecting portion. The connecting portion is provided with a supporting portion in the middle. The upper plastic, the top cover piece and the lower plastic are sleeved on the connecting portion and located between the welding portion and the supporting portion. An end of the connecting portion away from the welding portion extends into the pole and is welded with the pole. The sealing ring is provided with a sealing portion. The sealing ring is sleeved on the outer circumferential surface of the connecting portion, and the sealing portion abuts between the top cover piece and the supporting portion. The sealing ring is used to seal the gap between the edge of the hole group and the connecting portion.

[0006] In some embodiments of the present application, the connecting portion of the welding piece extends through a set of holes formed by the through holes of the upper plastic, the top cover and the lower plastic, and the connecting portion supports the upper plastic, the top cover and the lower plastic through the support portion to position the upper plastic, the top cover and the lower plastic, and ensure the stability of the connection between the upper plastic, the top cover and the lower plastic. Further, one end of the connecting portion extending through the set of holes extends into the pole column, and the welding piece and the pole column are welded together by a laser welding machine through the gap between the pole column and the connecting portion, without riveting on the upper surface of the welding portion of the cover plate assembly, leaving a larger welding area for the welding plate, ensuring the overcurrent area of the battery cell, and further improving the heat dissipation effect of the battery cell.

[0007] In some embodiments of the present application, the pole column is provided with a sink near one end of the welding piece, and the support portion is arranged in the sink.

[0008] In some embodiments of the present application, the bottom of the sink is provided with a welding hole, the connecting portion extends into the welding hole, and the welding hole is used for welding with the connecting portion.

[0009] In some embodiments of the present application, the pole column is provided with a groove away from the sink, and the depth of the groove is greater than the estimated welding seam height.

[0010] In some embodiments of the present application, the upper plastic is provided with a stepped hole near one end of the top cover, the sealing ring is arranged in the stepped hole away from the support portion, and abuts against the stepped surface of the stepped hole.

[0011] In some embodiments of the present application, the upper plastic is provided with a protrusion around one end of the top cover, the top cover is provided with a recess matched with the protrusion, and a part of the protrusion is located in the recess, or the top cover is provided with a protrusion, and the upper plastic is provided with a recess matched with the protrusion around one end of the top cover, and a part of the protrusion is located in the recess.

[0012] In some embodiments of the present application, the lower plastic is provided with a mounting groove accommodating the pole column on one side away from the top cover, and is provided with a reinforcing rib structure.

[0013] The present application also provides a battery cell, which comprises the cover plate assembly according to any one of the preceding embodiments, a shell cooperating with the cover plate assembly to form a containing space, and a pole core arranged in the containing space.

[0014] In some embodiments of the present application, the welding block and the pole of the cover plate assembly are connected by welding, without riveting on the upper surface of the welding part of the cover plate assembly, thus leaving a larger welding area for the welding pad. The cover plate assembly described above can ensure the overcurrent area of the battery cell, thus improving the heat dissipation effect of the battery cell.

[0015] The embodiments of the present application also provide a battery, which comprises a plurality of battery cells as described in the foregoing embodiments.

[0016] The embodiments of the present application also provide a vehicle, which comprises a main body part and a battery cell as described in the foregoing embodiments, or a battery as described in the foregoing embodiments; wherein the main body part is electrically connected with the battery cell or the battery.

[0017] In some embodiments of the present application, the battery and the vehicle apply the cover plate assembly described above, which is beneficial to ensure the overcurrent area of the battery cell, improve the heat dissipation effect of the battery cell, avoid the overheating problem of the battery and the vehicle, and thus prolong the service life of the battery and the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a perspective view of a cover plate assembly according to an embodiment of the present application.

[0019] Figure 2 FIG. 2 is an exploded view of the cover plate assembly according to the embodiment of the present application.

[0020] Figure 3 FIG. 3 is another visual exploded view of the cover plate assembly according to the embodiment of the present application.

[0021] Figure 4 FIG. 4 is a sectional view along the cutting line IV-IV in FIG. 3. Figure 1

[0022] FIG. 5 is a sectional view along the cutting line V-V in FIG. 3. Figure 5 Figure 4 FIG. 6 is an enlarged view of VI in FIG. 5.

[0023] Figure 6 FIG. 7 is a partial sectional view of the pole of the cover plate assembly according to the embodiment of the present application.

[0024] Figure 7 FIG. 8 is a structural schematic view of a battery cell according to an embodiment of the present application.

[0025] Figure 8 FIG. 9 is a structural schematic view of a battery according to an embodiment of the present application.

[0026] Figure 9 FIG. 10 is a structural schematic view of a vehicle according to an embodiment of the present application.

[0027] MAIN ELEMENT SYMBOL EXPLANATION

[0028] ​100 - cover plate assembly; 11 - welding piece; 111 - welding portion; 112 - connecting portion; 1121 - supporting portion; 12 - upper plastic; 121 - first through hole; 122 - stepped hole; 123 - protrusion; 124 - accommodating cavity; 125 - protruding ring; 13 - sealing ring; 131 - sealing portion; 1311 - first sealing surface; 1312 - second sealing surface; 132 - body; 14 - top cover piece; 141 - second through hole; 142 - recess; 143 - accommodating groove; 15 - lower plastic; 151 - third through hole; 152 - mounting groove; 153 - reinforcing rib structure; 16 - pole column; 161 - sink groove; 1611 - welding hole; 162 - groove; 200 - battery cell; 21 - shell; 211 - accommodating space; 22 - pole core; 300 - battery; 400 - vehicle; 41 - main body portion.

[0029] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0032] At present, power batteries have been widely used in automobiles, backup power systems and micro-grid energy storage systems. The battery cover plate assembly is an important part of the power battery. The existing cover plate assembly adopts a riveting process to rivet the baffle on the riveting block.

[0033] However, during the riveting process, due to the large riveting circle diameter, the area occupied by the riveting block is large, which limits the welding area of the baffle, thereby causing the overcurrent area of the battery cell to be small, the heat is not easy to conduct, and the heat dissipation effect of the battery cell is poor. In addition, the small welding area has a large welding position resistance and weak current carrying capacity, which causes the battery cell to overheat.

[0034] Therefore, in order to solve the above technical problems, the embodiment of the present application provides a cover plate assembly. The cover plate assembly comprises a welding piece, an upper plastic, a sealing ring, a top cover piece, a lower plastic and a pole. The pole is arranged on the lower plastic. The upper plastic and the lower plastic are located on opposite sides of the top cover piece. The upper plastic, the top cover piece and the lower plastic are all provided with through holes. The through holes of the upper plastic, the top cover piece and the lower plastic correspond to each other and form a group of holes. The welding piece is provided with a welding portion and a connecting portion. The middle part of the connecting portion is provided with a supporting portion. The upper plastic, the top cover piece and the lower plastic are sleeved on the connecting portion and located between the welding portion and the supporting portion. The end of the connecting portion away from the welding portion extends into the pole and is welded with the pole. The sealing ring is provided with a sealing portion. The sealing ring is sleeved on the outer circumferential surface of the connecting portion. The sealing portion is abutted between the top cover piece and the supporting portion and is used for sealing the gap between the edge of the hole group and the connecting portion.

[0035] When the connecting portion of the welding piece passes through the upper plastic, the sealing ring, the top cover piece and the lower plastic and extends into the pole, the gap between the pole and the connecting portion is welded by the laser welding machine to weld the welding piece and the pole together. Riveting is not needed on the upper surface of the welding portion of the cover plate assembly. A larger welding area is reserved for the welding plate. The overcurrent area of the battery cell is ensured. The heat dissipation effect of the battery cell is improved.

[0036] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] Please refer to Figures 1 to 5 An embodiment of the present application provides a cover plate assembly 100. The cover plate assembly 100 comprises a welding piece 11, an upper plastic 12, a sealing ring 13, a top cover piece 14, a lower plastic 15 and a pole 16. The pole 16 is arranged on the lower plastic 15. The upper plastic 12 and the lower plastic 15 are located on opposite sides of the top cover piece 14. The upper plastic 12, the top cover piece 14 and the lower plastic 15 are all provided with through holes. The through holes of the upper plastic 12, the top cover piece 14 and the lower plastic 15 correspond to each other and form a group of holes. The welding piece 11 is provided with a welding portion 111 and a connecting portion 112. The middle part of the connecting portion 112 is provided with a supporting portion 1121. The upper plastic 12, the top cover piece 14 and the lower plastic 15 are sleeved on the connecting portion 112 and located between the welding portion 111 and the supporting portion 1121. The end of the connecting portion 112 away from the welding portion 111 extends into the pole 16 and is welded with the pole 16. The sealing ring 13 is provided with a sealing portion 131. The sealing ring 13 is sleeved on the outer circumferential surface of the connecting portion 112 and the sealing portion 131 is abutted between the top cover piece 14 and the supporting portion 1121. The sealing ring 13 is used for sealing the gap between the edge of the hole group and the connecting portion 112.

[0038] In some embodiments of the present application, the upper plastic 12 is provided with a first through hole 121, the top cover 14 is provided with a second through hole 141 corresponding to the first through hole 121, and the lower plastic 15 is provided with a third through hole 151 corresponding to the second through hole 141, and the first through hole 121, the second through hole 141 and the third through hole 151 opposite to each other form a group of holes.

[0039] In some embodiments of the present application, the connecting portion 112 of the welding piece 11 extends out of a group of holes formed by the through holes of the upper plastic 12, the top cover 14 and the lower plastic 15, and supports the upper plastic 12, the top cover 14 and the lower plastic 15 through the supporting portion 1121 of the connecting portion 112 to position the upper plastic 12, the top cover 14 and the lower plastic 15 and ensure the stability of the connection between the upper plastic 12, the top cover 14 and the lower plastic 15. Further, one end of the connecting portion 112 extending out of the group of holes extends into the pole 16, and the welding piece 11 and the pole 16 are welded together by the laser welding machine aligning the gap between the pole 16 and the connecting portion 112 for welding, without the need for riveting on the upper surface of the welding portion 111 of the cover plate assembly 100, leaving a larger welding area for the welding tab and ensuring the overcurrent area of the battery cell 200, thereby improving the heat dissipation effect of the battery cell 200.

[0040] In some embodiments of the present application, the upper surface of the supporting portion 1121 is used to support the sealing ring 13, which is conducive to improving the stability of the position of the sealing ring 13, and at the same time, the overall thickness of the cover plate assembly 100 is ensured.

[0041] In some embodiments of the present application, as shown in Figure 3 The end of the sealing ring 13 away from the supporting portion 1121 is arranged in the stepped hole 122 and abuts against the stepped surface of the stepped hole 122.

[0042] In some embodiments of the present application, by abutting the end of the sealing ring 13 away from the supporting portion 1121 against the stepped surface of the stepped hole 122, the stability between the sealing ring 13 and the welding piece 11 is ensured.

[0043] In some embodiments of the present application, the periphery of the end of the upper plastic 12 close to the top cover 14 is provided with a protrusion 123, the top cover 14 is provided with a recess 142 matched with the protrusion 123, and a part of the protrusion 123 is located in the recess 142.

[0044] In other embodiments, the top cover 14 is provided with a protrusion (not shown in the figure), the end of the upper plastic 12 close to the top cover 14 is provided with a recess (not shown in the figure) matched with the protrusion, and a part of the protrusion is located in the recess.

[0045] In some embodiments of the present application, the upper plastic 12 and the top cover 14 are connected by the protrusions 123 and the recesses 142, which can improve the stability of the connection between the upper plastic 12 and the top cover 14, and can also enhance the torsion of the pole 16.

[0046] In some embodiments of the present application, the number of protrusions 123 can be two, three, four or more.

[0047] In some embodiments of the present application, the middle part of the end of the upper plastic 12 close to the top cover 14 can also be provided with protrusions 123, which are not limited in the present embodiment.

[0048] In some embodiments of the present application, the end of the upper plastic 12 close to the top cover 14 and the edge of the through hole can also be provided with a convex ring 125, and the top cover 14 is provided with a receiving groove 143 matched with the convex ring 125, and the convex ring 125 is arranged in the receiving groove 143, which can improve the stability of the connection between the upper plastic 12 and the top cover 14.

[0049] In some embodiments of the present application, the end of the upper plastic 12 away from the top cover 14 is provided with a receiving cavity 124. Part of the welding part 111 is arranged in the receiving cavity 124, which can reduce the overall thickness of the cover assembly 100.

[0050] In some embodiments of the present application, the upper plastic 12 and the top cover 14 are detachably connected, which can facilitate the disassembly and assembly of the upper plastic 12 and the top cover 14, and improve the convenience of assembling the cover assembly 100.

[0051] In some embodiments of the present application, the side of the lower plastic 15 away from the top cover 14 is provided with a mounting groove 152 for accommodating the pole 16, and is provided with a reinforcing rib structure 153.

[0052] In some embodiments of the present application, by arranging part of the pole 16 in the mounting groove 152, the overall thickness of the cover assembly 100 can be reduced, and the weight of the cover assembly 100 can be reduced.

[0053] In some embodiments of the present application, by arranging the reinforcing rib structure 153 on the lower plastic 15, the mounting strength of the lower plastic 15 can be improved, and the deformation of the lower plastic 15 can be prevented.

[0054] In some embodiments of the present application, the lower plastic 15 and the top cover 14 are detachably connected, which can facilitate the disassembly and assembly of the lower plastic 15 and the top cover 14, and improve the convenience of assembling the cover assembly 100.

[0055] In some embodiments of the present application, as Figure 5As shown, the sealing ring 13 is provided with a sealing portion 131. The sealing portion 131 includes a first sealing surface 1311 and a second sealing surface 1312. The first sealing surface 1311 abuts against the lower surface of the top cover 14, and the second sealing surface 1312 abuts against the upper surface of the support portion 1121, which is conducive to improving the sealing effect between the welding piece 11 and the pole piece 16, and ensures the sealing effect of the sealing ring 13.

[0056] In some embodiments of the present application, the sealing ring 13 is further provided with a body 132, which is completely attached to the connecting portion 112 of the welding block, further improving the sealing effect between the welding piece 11 and the pole piece 16.

[0057] Further combining Figure 6 As shown, in some embodiments of the present application, the pole piece 16 is provided with a sink 161 near one end of the welding piece 11. The support portion 1121 is installed in the sink 161, and cooperates with the pole piece 16 through the support portion 1121, which is conducive to ensuring the stability of the position between the support portion 1121 and the pole piece 16.

[0058] In some embodiments of the present application, the bottom of the sink 161 is provided with a welding hole 1611. The connecting portion 112 extends into the welding hole 1611. The welding hole 1611 is used for welding with the connecting portion 112.

[0059] In some embodiments of the present application, the end surface of the connecting portion 112 away from the welding portion 111 can be flush with the end surface of the welding hole 1611, which is conducive to better welding of the connecting portion 112 and the pole piece 16.

[0060] In some embodiments of the present application, the connecting portion 112 extends into the welding hole 1611, and a laser welding machine is used to weld the gap between the pole piece 16 and the connecting portion 112, so as to weld the welding piece 11 and the pole piece 16 together. On the one hand, it can ensure the firmness and sealing of the connection between the welding piece 11 and the pole piece 16, and on the other hand, it does not need to be riveted on the upper surface of the welding portion 111 of the cover plate assembly 100, which reserves a larger welding area for the welding piece, ensures the overcurrent area of the battery cell 200, and further improves the heat dissipation effect of the battery cell 200.

[0061] In some embodiments of the present application, the pole piece 16 is provided with a groove 162 away from the sink 161. The depth of the groove 162 is greater than the estimated weld height.

[0062] In some embodiments of the present application, the diameter of the groove 162 is greater than the diameter of the welding hole 1611. During the welding process of the connecting portion 112 and the pole piece 16, a high-depth weld is usually formed. By setting the groove 162, it is conducive to avoiding the weld height and improving the welding quality between the welding block and the pole piece 16.

[0063] Further combiningFigure 7 As shown, the embodiments of the present application further provide an electric core 200. The electric core 200 comprises a shell 21, a pole core 22, and the cover plate assembly 100 according to any one of the preceding embodiments. The shell 21 cooperates with the cover plate assembly 100 to form a containing space 211. The pole core 22 is arranged in the containing space 211.

[0064] In some embodiments of the present application, the shell 21 cooperates with the cover plate assembly 100 to form the containing space 211. The containing space 211 can be provided with the pole core 22, a diaphragm, and other structures, which are not described herein.

[0065] In some embodiments of the present application, the welding block of the cover plate assembly 100 is connected to the pole 16 by welding, and the upper surface of the welding portion 111 of the cover plate assembly 100 does not need to be riveted, thereby reserving a larger welding area for the welding tab. Through the cover plate assembly 100 described above, the overcurrent area of the electric core 200 can be ensured, thereby improving the heat dissipation effect of the electric core 200.

[0066] Further combining Figure 8 As shown, the embodiments of the present application further provide a battery 300 comprising a plurality of electric cores 200 according to the preceding embodiments.

[0067] In some embodiments of the present application, the battery 300 comprises a plurality of electric cores 200 connected in series and / or in parallel. The plurality of electric cores 200 cooperates to supply power externally. The battery 300 can further comprise other structures, such as a battery management assembly (BMS), a wire harness, and the like, which are not described herein.

[0068] Further combining Figure 9 As shown, the embodiments of the present application further provide a vehicle 400 comprising a main body 41, and the electric core 200 according to the preceding embodiments, or the battery 300 according to the preceding embodiments. The main body 41 is electrically connected to the electric core 200 or the battery 300.

[0069] In some embodiments of the present application, the main body 41 of the vehicle 400 can comprise a frame, an engine and / or a motor, a wire harness, a sensing system, and other structures, which are not described herein. The battery 300 is electrically connected to the main body 41, and is used to provide kinetic energy for the vehicle 400.

[0070] In some embodiments of the present application, the battery 300 and the vehicle 400 apply the cover plate assembly 100 described above, which is beneficial to ensure the overcurrent area of the electric core 200, improve the heat dissipation effect of the electric core 200, avoid the problem of overheating of the battery 300 and the vehicle 400, and thereby prolong the service life of the battery 300 and the vehicle 400.

[0071] The above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is illustrated with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and essence of the technical solutions of the present application.

Claims

1. A cover assembly, characterized by The cover plate assembly comprises a welding piece, an upper plastic, a sealing ring, a top cover piece, a lower plastic, and a pole; The pole is arranged on the lower plastic; The upper plastic and the lower plastic are located on opposite sides of the top cover piece, the upper plastic, the top cover piece, and the lower plastic are all provided with through holes, the through holes of the upper plastic, the top cover piece, and the lower plastic correspond to each other and form a group of holes; The welding piece is provided with a welding portion and a connecting portion, a middle portion of the connecting portion is provided with a supporting portion, the upper plastic, the top cover piece, and the lower plastic are sleeved on the connecting portion and located between the welding portion and the supporting portion, an end of the connecting portion away from the welding portion penetrates into the pole and is welded with the pole; The sealing ring is provided with a sealing portion, the sealing ring is sleeved on an outer circumferential surface of the connecting portion, and the sealing portion abuts between the top cover piece and the supporting portion, the sealing ring is used for sealing a gap between edges of the group of holes and the connecting portion.

2. The cover plate assembly of claim 1, wherein, An end of the pole close to the welding piece is provided with a sink, and the supporting portion is arranged in the sink.

3. The cover plate assembly of claim 2, wherein, A bottom of the sink is provided with a welding hole, the connecting portion penetrates into the welding hole, and the welding hole is used for welding with the connecting portion.

4. The cover plate assembly of claim 3, wherein, An end of the pole away from the sink is provided with a groove, and a depth of the groove is greater than an estimated weld height.

5. The cover plate assembly of claim 1, wherein, An end of the upper plastic close to the top cover piece is provided with a stepped hole, an end of the sealing ring away from the supporting portion penetrates into the stepped hole and abuts with a stepped surface of the stepped hole.

6. The cover plate assembly of claim 1, wherein, A periphery of an end of the upper plastic close to the top cover piece is provided with a protrusion, the top cover piece is provided with a recess matched with the protrusion, a part of the protrusion is located in the recess, or the top cover piece is provided with a protrusion, an end of the upper plastic close to the top cover piece is provided with a recess matched with the protrusion, and a part of the protrusion is located in the recess.

7. The cover plate assembly of claim 1, wherein, A side of the lower plastic away from the top cover piece is provided with a mounting groove accommodating the pole and protruding with a reinforcing rib structure.

8. An electric cell characterized by The cover plate assembly comprises: The cover plate assembly according to any one of claims 1 to 7; A shell, which cooperates with the cover plate assembly to form a containing space; A pole core arranged in the containing space.

9. A battery, characterized by The battery comprises a plurality of the pole core according to claim 8.

10. A vehicle characterized by comprising: The battery comprises: A main body portion; And The pole core according to claim 8 or the battery according to claim 9; The main body portion is electrically connected with the pole core or the battery.

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