CN218472100U

CN218472100U - Top cover assembly and power battery

Info

Publication number: CN218472100U
Application number: CN202222488181.XU
Authority: CN
Inventors: 郑旭; 舒宽金; 贺孝武; 安苏礼; 邓振; 何巍
Original assignee: Huizhou Eve Power Battery Co ltd; Hubei Eve Power Co Ltd
Current assignee: Huizhou Eve Power Battery Co ltd; Hubei Eve Power Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-02-10
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a battery technology field discloses top cap subassembly and power battery. This top cap subassembly includes the top cap piece, lower plastic, connection piece and welding piece, set up first connecting hole on the top cap piece, lower plastic setting is at the lower terminal surface of top cap piece, the second connecting hole has been seted up on the lower plastic, the connection piece sets up the lower terminal surface of plastic down, the third connecting hole has been seted up on the connection piece, the welding piece includes the body and sets up the first boss on the body, body insulation connects in the top cap piece, first boss wears to locate first connecting hole and second connecting hole, and the plug-in is in the third connecting hole, first boss is connected with top cap piece insulation. The power battery comprises the top cover assembly. The top cover assembly and the power battery are light in weight, simple in installation process and installation structure, low in cost and high in installation efficiency.

Description

Top cover assembly and power battery

Technical Field

The utility model relates to a battery technology field especially relates to top cap subassembly and power battery.

Background

The pole in the power battery is a necessary component communicated with the inside and the outside of the power battery, one end of the pole is connected with an external circuit of the power battery, and the other end of the pole is connected with an electric core in the power battery. Most of the conventional power batteries are manufactured by a friction welding process, the structural strength is low, the power batteries are easy to break, and the cost is high. In the prior art, the battery top cover with the pole is mainly manufactured by an injection molding process and a riveting process. The injection molding process is limited by the field of injection molding equipment and processes of material forming and the like, so that the production efficiency of the top cover is low; the riveting process has more process flows and complicated production steps, and also causes the production efficiency of the top cover to be lower, so that the increasing market of the battery cell cannot be met.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a top cap subassembly and power battery, weight is lighter, and installation procedure and mounting structure are simple, and the cost is lower, the installation effectiveness is higher.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a header assembly, comprising:

the top cover plate is provided with a first connecting hole;

the lower plastic is arranged on the lower end face of the top cover plate and provided with a second connecting hole;

the connecting piece is arranged on the lower end face of the lower plastic, and a third connecting hole is formed in the connecting piece;

the welding block comprises a body and a first boss arranged on the body, the body is connected to the top cover plate in an insulating mode, the first boss penetrates through the first connecting hole and the second connecting hole and is inserted into the third connecting hole, and the first boss is connected with the top cover plate in an insulating mode.

As a preferred scheme of the top cover assembly, the aperture of the second connecting hole is larger than that of the third connecting hole, a first step surface is formed between the second connecting hole and the third connecting hole, the welding block further comprises a second boss arranged at one end, far away from the body, of the first boss, the second boss is inserted into the third connecting hole, a second step surface is formed between the second boss and the first boss, and the second step surface abuts against the first step surface.

The top cover assembly preferably further comprises a sealing element, the aperture of the first connecting hole is larger than that of the second connecting hole, a third step surface is formed between the first connecting hole and the second connecting hole, and the sealing element is sleeved on the periphery of the first boss and arranged on the third step surface.

As the top cover component, the top cover component further comprises upper plastic, a mounting groove is formed in the upper end face of the top cover piece, the upper plastic is embedded in the mounting groove, a first limiting groove is formed in the upper plastic, a fourth connecting hole is formed in the groove bottom of the first limiting groove, the body is clamped in the first limiting groove, and the first boss penetrates through the fourth connecting hole.

As a preferable scheme of the top cover assembly, an aperture of the fourth connecting hole is larger than an aperture of the first connecting hole, a fourth step surface is formed between the fourth connecting hole and the first connecting hole, a flange is arranged at the upper end of the sealing element in a radially outward direction, and the flange abuts against the fourth step surface.

As the preferred scheme of top cap subassembly, the lower terminal surface of top cap piece has seted up the second spacing groove, down the plastic be close to one side of top cap piece sets up first arch, first protruding card is established in the second spacing groove, first connecting hole is seted up in the tank bottom of second spacing groove.

As the preferred scheme of top cap subassembly, the lower terminal surface of plastic is provided with the third spacing groove down, the third spacing groove corresponds first arch, the connection piece is close to one side of plastic sets up the second arch down, the protruding card of second is established in the third spacing groove, the second connecting hole is seted up in the tank bottom of third spacing groove.

As the preferred scheme of top cap subassembly, the lower terminal surface of connection piece has seted up and has dodged the groove, dodge the groove and correspond the second arch, the third connecting hole set up in dodge the tank bottom of groove.

As a preferable scheme of the top cover assembly, the upper end of the body is provided with a weight reduction groove.

The power battery comprises the top cover assembly in any one technical scheme.

The utility model has the advantages that:

the utility model provides a top cap subassembly, this top cap subassembly include top cap piece, lower plastic, connection piece and welding piece, set up down the plastic between the connection piece for it is insulating between connection piece and the top cap piece, through body insulation connection top cap piece, and peg graft with the third connecting hole after first boss passes first connecting hole and second connecting hole, realize that the welding piece is connected top cap piece, lower plastic and connection piece fixedly, and the welding piece switches on with the connection piece simultaneously. The structure omits the traditional pole, so that the weight of the top cover assembly can be reduced; and need not to adopt extra structure to connect fixed welding piece and connection piece, the welding piece has realized promptly that the connection of cover plate, lower plastic and connection piece is fixed, has simplified installation procedure and mounting structure, is favorable to saving the cost and improves the installation effectiveness.

The utility model discloses still provide power battery, this power battery includes foretell top cap subassembly for this power battery packaging efficiency is higher, and the cost is lower, and weight is lighter.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a top cover assembly provided in an embodiment of the present invention;

fig. 2 is a cross-sectional view of a cap assembly provided by an embodiment of the present invention;

fig. 3 is an exploded view of a header assembly provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a top cover sheet provided by an embodiment of the present invention;

fig. 5 is a schematic structural view of a lower plastic according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a connecting sheet provided in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a welding block provided in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a sealing member according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a power battery provided by an embodiment of the present invention.

In the figure:

1. a top cover sheet;

2. plastic is discharged; 21. a first protrusion;

3. connecting sheets; 31. a second protrusion; 4. welding the blocks; 41. a body; 42. a first boss; 43. a second boss; 401. a second step surface;

5. plastic is coated; 6. a seal member; 61. flanging; 7. an explosion-proof valve; 8. a housing;

10. a first connection hole; 20. a second connection hole; 30. a third connection hole; 40. a fourth connection hole; 50. lightening holes;

100. mounting grooves; 200. a first limit groove; 300. a second limit groove; 400. a third limiting groove; 500. an avoidance groove; 600. and a weight reduction groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 8, this embodiment provides a top cover assembly, this top cover assembly includes top cover plate 1, lower plastic 2, connection piece 3 and welding piece 4, set up first connecting hole 10 on the top cover plate 1, lower plastic 2 sets up the lower terminal surface at top cover plate 1, second connecting hole 20 has been seted up on lower plastic 2, connection piece 3 sets up the lower terminal surface at lower plastic 2, third connecting hole 30 has been seted up on connection piece 3, welding piece 4 includes body 41 and the first boss 42 of setting on body 41, body 41 insulation connection is in top cover plate 1, first boss 42 wears to locate first connecting hole 10 and second connecting hole 20, and the plug-in is in third connecting hole 30, first boss 42 and top cover plate 1 insulation connection. Set up down plastic 2 between the connection piece 3 for it is insulating between connection piece 3 and the top cap piece 1, through body 41 insulating connection top cap piece 1, and peg graft with third connecting hole 30 after first boss 42 passes first connecting hole 10 and second connecting hole 20, realize that welding piece 4 is connected top cap piece 1, lower plastic 2 and connection piece 3 fixedly, welding piece 4 switches on with connection piece 3 simultaneously. The structure omits the traditional pole, so that the weight of the top cover assembly can be reduced; and need not to adopt extra structure to connect fixed welding piece 4 and connection piece 3, welding piece 4 has realized the connection of top sheet 1, lower plastic 2 and connection piece 3 promptly and has fixed, has simplified installation procedure and mounting structure, is favorable to saving the cost and improves the installation effectiveness.

In this embodiment, the top cover plate 1 is provided with the explosion-proof valve 7, the top cover plate 1 is provided with two first connection holes 10 at intervals, the two first connection holes 10 are located on two sides of the explosion-proof valve 7, the lower plastic 2 is provided with two second connection holes 20 at intervals, the welding blocks 4 and the connection blocks 3 are respectively provided with two connection blocks, one connection block 3 is a negative connection block 3, the other connection block 3 is a positive connection block 3, one welding block 4 is connected with the negative connection block 3 to form a negative electrode side, the other welding block 4 is connected with the positive connection block 3 to form a positive electrode side, and the top cover assembly is in a bilateral symmetry structure, that is, the positive electrode side and the negative electrode side are the same in structure.

Specifically, insert the first boss 42 of welding piece 4 behind locating third connecting hole 30, through the tool compression for welding piece 4, top cover piece 1, lower plastic 2 and connection piece 3 closely laminate, then are connected fixedly welding piece 4 and connection piece 3 through laser welding technology, realize that top cap assembly's equipment is fixed. The top cover assembly provided by the embodiment is suitable for compression of a jig, so that the structural stability of the top cover assembly is high; and the welding block 4 and the connecting sheet 3 are fixed by laser welding, so that the welding method is simple and convenient and has a good connecting effect.

Preferably, the welding block 4 is formed by punching a composite plate, and compared with the conventional pole which is manufactured by adopting a friction welding process, the welding block 4 provided by the embodiment has the advantages of low manufacturing process requirement and cost, difficulty in causing thermal stress and cracks, and high structural strength and safety.

Preferably, as shown in fig. 3, the upper end of the body 41 is provided with a lightening slot 600 and/or the connecting piece 3 is provided with lightening holes 50, which is beneficial to lightening the weight of the welding block 4 and/or the connecting piece 3, thereby lightening the weight of the top cover assembly.

Further, as shown in fig. 2 and 3, the top cover assembly further includes an upper plastic 5, the upper end surface of the top cover plate 1 is provided with a mounting groove 100, the upper plastic 5 is embedded in the mounting groove 100, the upper plastic 5 is provided with a first limiting groove 200, the bottom of the first limiting groove 200 is provided with a fourth connecting hole 40, the body 41 is clamped in the first limiting groove 200, and the first boss 42 penetrates through the fourth connecting hole 40. The upper plastic 5 isolates the welding block 4 from the top cover plate 1, so that the insulation effect is achieved; through setting up mounting groove 100 and first spacing groove 200 for go up the rigidity of plastic 5 on top cap piece 1, the rigidity of welding block 4 on last plastic 5, the assembly of being convenient for guarantees top cap subassembly's assembly precision, thereby improves top cap subassembly's yield.

In order to avoid the contact and conduction of the first boss 42 and the top cover plate 1, the aperture of the first connecting hole 10 is larger than that of the second connecting hole 20, the first boss 42 penetrates through the first connecting hole 10 and the second connecting hole 20, and then a distance is reserved between the periphery of the first boss 42 and the hole wall of the first connecting hole 10, namely, the contact of the first boss 42 and the top cover plate 1 is avoided, so that the safety of the top cover plate 1 is ensured.

Preferably, the top cap assembly further includes a sealing member 6, a third step surface is formed between the first connection hole 10 and the second connection hole 20, and the sealing member 6 is fitted over the outer circumference of the first boss 42 and disposed on the third step surface. The sealing element 6 enables the top cover plate 1 and the first boss 42 to be connected in a sealing mode, and can limit the welding block 4, so that the assembly stability of the top cover assembly is guaranteed.

More preferably, as shown in fig. 2 and 8, the fourth connection hole 40 has a larger diameter than the first connection hole 10, a fourth step surface is formed between the fourth connection hole 40 and the first connection hole 10, a flange 61 is provided radially outward at the upper end of the sealing member 6, and the flange 61 abuts against the fourth step surface. Turn-ups 61 sealing connection is under body 41 between terminal surface and the fourth step face promptly, guarantees the leakproofness of welding piece 4 and top cap piece 1, avoids first connecting hole 10 gas leakage to improve top cap subassembly's safety in utilization.

In this embodiment, the sealing member 6 is made of an elastic material resistant to acid, alkali and high temperature, and has high sealing performance and long service life.

Furthermore, as shown in fig. 2, 3 and 7, the aperture of the second connection hole 20 is larger than the aperture of the third connection hole 30, a first step surface is formed between the second connection hole 20 and the third connection hole 30, the welding block 4 further includes a second boss 43 disposed at one end of the first boss 42 away from the body 41, the second boss 43 is inserted into the third connection hole 30, a second step surface 401 is formed between the second boss 43 and the first boss 42, and the second step surface 401 abuts against the first step surface. That is, the first boss 42 and the second boss 43 are inserted into the step holes formed by the second connecting hole 20 and the third connecting hole 30, which is favorable for improving the connection stability and the contact area of the welding block 4 and the connecting sheet 3 and ensures the welding strength of the welding block 4 and the connecting sheet 3.

Alternatively, the cross-sectional shape of the first boss 42 or the second boss 43 may be circular, oval, square, or the like, which is not limited herein.

In this embodiment, as shown in fig. 2, fig. 3 and fig. 4, a second limiting groove 300 is formed on the lower end surface of the top cover plate 1, a first protrusion 21 is disposed on one side of the lower plastic 2 close to the top cover plate 1, the first protrusion 21 is clamped in the second limiting groove 300, and the first connecting hole 10 is formed at the bottom of the second limiting groove 300. When assembling the top cap subassembly, will be down the location of plastic 2 can be realized down in the first arch 21 of plastic 2 is put into second spacing groove 300, and is simple swift, can effectively guarantee top cap subassembly's assembly precision and joint strength.

Further, as shown in fig. 2, fig. 3 and fig. 5, a third limiting groove 400 is disposed on a lower end surface of the lower plastic 2, the third limiting groove 400 corresponds to the first protrusion 21, a second protrusion 31 is disposed on one side of the connecting piece 3 close to the lower plastic 2, the second protrusion 31 is clamped in the third limiting groove 400, and the second connecting hole 20 is opened at a bottom of the third limiting groove 400. The second protrusion 31 of the connecting sheet 3 is placed in the third limiting groove 400, so that the connecting sheet 3 can be positioned simply and quickly, and the assembly efficiency and the connection stability of the connecting sheet 3 and the lower plastic 2 are improved.

Preferably, as shown in fig. 2, 3 and 6, an avoiding groove 500 is formed on a lower end surface of the connecting piece 3, the avoiding groove 500 corresponds to the second protrusion 31, and the third connecting hole 30 is formed at a bottom of the avoiding groove 500. The part that corresponds protruding 31 of second sets up and dodges groove 500 and can guarantee the structural strength of connection piece 3, and dodges being provided with of groove 500 and do benefit to the inner space that enlarges power battery, plays the effect of dodging to inner structure to make the inside electric core package height of power battery increase, improve power battery's energy density.

As shown in fig. 9, the present embodiment further provides a power battery, which includes a casing 8, a battery core pack, and the above-mentioned top cover assembly, where the top cover assembly covers the open end of the casing 8, and the battery core pack is disposed in the casing 8. By adopting the top cover assembly, the overall weight of the power battery is lighter, the internal space of the shell 8 is larger, and the height of the electric core package can be effectively increased, so that the energy density of the power battery is increased; the production process of the power battery is reduced, and the production efficiency is high; meanwhile, the traditional pole is omitted, and the production cost can be effectively reduced.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A header assembly, comprising:

the top cover piece (1), wherein a first connecting hole (10) is formed in the top cover piece (1);

the lower plastic (2) is arranged on the lower end face of the top cover plate (1), and a second connecting hole (20) is formed in the lower plastic (2);

the connecting piece (3) is arranged on the lower end face of the lower plastic (2), and a third connecting hole (30) is formed in the connecting piece (3);

the welding block (4) comprises a body (41) and a first boss (42) arranged on the body (41), the body (41) is connected to the top cover plate (1) in an insulating mode, the first boss (42) penetrates through the first connecting hole (10) and the second connecting hole (20) and is inserted into the third connecting hole (30), and the first boss (42) is connected with the top cover plate (1) in an insulating mode.

2. The top cap assembly according to claim 1, wherein the aperture of the second connecting hole (20) is larger than the aperture of the third connecting hole (30), a first step surface is formed between the second connecting hole (20) and the third connecting hole (30), the welding block (4) further comprises a second boss (43) disposed at one end of the first boss (42) far away from the body (41), the second boss (43) is inserted into the third connecting hole (30), a second step surface (401) is formed between the second boss (43) and the first boss (42), and the second step surface (401) abuts against the first step surface.

3. The top cap assembly according to claim 1, further comprising a sealing member (6), wherein the aperture of the first connecting hole (10) is larger than the aperture of the second connecting hole (20), a third step surface is formed between the first connecting hole (10) and the second connecting hole (20), and the sealing member (6) is sleeved on the periphery of the first boss (42) and is disposed on the third step surface.

4. The top cover assembly according to claim 3, further comprising an upper plastic (5), wherein a mounting groove (100) is formed in the upper end surface of the top cover piece (1), the upper plastic (5) is embedded in the mounting groove (100), a first limiting groove (200) is formed in the upper plastic (5), a fourth connecting hole (40) is formed in the bottom of the first limiting groove (200), the body (41) is clamped in the first limiting groove (200), and the first boss (42) penetrates through the fourth connecting hole (40).

5. The cap assembly according to claim 4, wherein the diameter of the fourth connecting hole (40) is larger than that of the first connecting hole (10), a fourth step surface is formed between the fourth connecting hole (40) and the first connecting hole (10), a flange (61) is arranged at the upper end of the sealing member (6) in a radial direction, and the flange (61) abuts against the fourth step surface.

6. The top cover assembly according to any one of claims 1 to 5, wherein a second limiting groove (300) is formed in the lower end surface of the top cover sheet (1), a first protrusion (21) is formed on one side of the lower plastic (2) close to the top cover sheet (1), the first protrusion (21) is clamped in the second limiting groove (300), and the first connecting hole (10) is formed in the bottom of the second limiting groove (300).

7. The top cover assembly according to claim 6, wherein a third limiting groove (400) is formed in the lower end surface of the lower plastic (2), the third limiting groove (400) corresponds to the first protrusion (21), a second protrusion (31) is formed on one side, close to the lower plastic (2), of the connecting piece (3), the second protrusion (31) is clamped in the third limiting groove (400), and the second connecting hole (20) is formed in the bottom of the third limiting groove (400).

8. The top cover assembly according to claim 7, wherein an avoiding groove (500) is formed in the lower end face of the connecting piece (3), the avoiding groove (500) corresponds to the second protrusion (31), and the third connecting hole (30) is formed in the bottom of the avoiding groove (500).

9. Cap assembly according to any one of claims 1 to 5, wherein the body (41) is provided at its upper end with a lightening slot (600).

10. A power cell comprising the cap assembly of any one of claims 1-9.