CN217589179U

CN217589179U - Top cover assembly and battery

Info

Publication number: CN217589179U
Application number: CN202221074161.1U
Authority: CN
Inventors: 吴迪; 李开波; 陈风; 何巍
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-10-14
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to a top cap subassembly and battery, wherein, the top cap subassembly includes plastic down, connection piece and top cap piece, the connection piece includes the piece body, be provided with first arch on the piece body, the plastic corresponds first arch down and is provided with first through-hole, and first arch runs through first through-hole, the pore wall of first through-hole extends towards one side of keeping away from the piece body has the deformation muscle, form first turning between first bellied lateral wall and the piece body, form first clearance between first turning and the lower plastic, the plastic sets up first filling portion towards a side protrusion of piece body down, first filling portion is adjacent to the deformation muscle, the piece body is adjacent to first bellied position and first filling portion support tightly, and at least partial first filling portion is filled in first clearance by the piece body with lower plastic after the extrusion. The top cover assembly improves the safety of the battery except for a gap generated by assembly. And in addition, the design does not need to additionally add an insulating structure to fill the first gap, so that the manufacturing cost is reduced.

Description

Top cover assembly and battery

Technical Field

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

Background

The power battery is a core component of the new energy automobile, and along with the rapid development of the new energy automobile industry, the requirement on the power battery is higher and higher, and how to further improve the safety of the battery is a problem of key attention of battery manufacturers.

The top cap subassembly is the indispensable partly of battery, and in top cap subassembly assembling process, in order to facilitate the assembly between connection piece, lower plastic and the top cap piece, must have assembly tolerance between the three to lead to the connection piece, down can have electric clearance after the assembly is accomplished between plastic and the top cap piece. Electrolyte in the battery can get into in the electric clearance through capillary effect to lead to the effective creepage distance between connection piece and the top cap piece to reduce, when abnormal phenomena such as short circuit appear inside the battery, the top cap subassembly is punctured easily and causes the fire. In the prior art, in order to eliminate the electric gap in the top cover assembly, an insulating material is required to be specially added to fill the electric gap when the top cover assembly is assembled, but in the mode, parts are required to be additionally added, the assembly is complex, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: provided is a top cover assembly which is simple in structure and high in safety.

The embodiment of the utility model provides a another aim at: a battery having a simple structure and low cost is provided.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, a top cover assembly is provided, which includes a lower plastic, a connecting piece and a top cover piece, wherein the connecting piece includes a piece body, a first protrusion is arranged on the piece body, the lower plastic is provided with a first through hole corresponding to the first protrusion, the top cover piece and the piece body are respectively located on two opposite sides of the lower plastic, and the first protrusion penetrates through the first through hole, the hardness of the piece body is higher than that of the lower plastic.

As an optimal scheme of the top cover assembly, the terminal assembly further comprises a terminal piece, the terminal piece is arranged on one side, away from the sheet body, of the lower plastic, the terminal piece is connected with the first protrusion, the terminal piece is provided with a terminal groove, the deformation rib is inserted into the terminal groove, and the inner side and the outer side of the deformation rib are respectively abutted to the outer side wall of the first protrusion and the groove wall of the terminal groove.

As a preferable mode of the top cover assembly, one end of the deformed rib, which is far away from the first filling part, abuts against the groove bottom of the terminal groove;

a second corner is formed between the outer side wall of the first protrusion and the end face, far away from the sheet body, of the first protrusion, a second gap is formed between the second corner and the deformed rib as well as the bottom of the terminal groove, and at least part of the deformed rib is filled in the second gap; and/or the presence of a gas in the gas,

and a third corner is formed between the groove bottom of the terminal groove and the groove wall of the terminal groove, a third gap is formed between the third corner and the deformed rib, and at least part of the deformed rib is filled in the third gap.

As a preferable scheme of the top cover assembly, one end of the deformed rib, which is far away from the first filling part, is provided with a second filling part, the second filling part abuts against the groove bottom of the terminal groove, and at least part of the second filling part is filled in the second gap.

As a preferable mode of the top cover assembly, one end of the deformed rib adjacent to the third corner is provided with a first inclined surface, the length of the first inclined surface is L1, the thickness of the deformed rib is L2, and L1 > 1/2 × L2.

As a preferable scheme of the top cover assembly, the included angle between the first inclined surface and the horizontal plane is theta, and theta is more than 45 degrees.

As a preferred scheme of the top cover assembly, the top cover plate is arranged on the lower plastic, one of the top cover plate and the lower plastic is provided with a plurality of second bulges at intervals, the other plastic is provided with a groove corresponding to the second bulges, and the second bulges are arranged in the grooves.

As a preferable scheme of the top cover assembly, a side surface of the first protrusion, which faces away from the terminal piece, is concavely provided with a welding groove, and a groove bottom of the welding groove is welded with the terminal piece.

In a preferred aspect of the cap assembly, the deformed rib has a thickness L2, and a length of an overlapping region of the first filling portion and the deformed rib is L3, where L3 is equal to or greater than 1/2 × L2.

As a preferred scheme of the top cover component, the top cover plate is arranged on the lower plastic, one of the top cover plate and the lower plastic is provided with a plurality of second bulges at intervals, the other one of the top cover plate and the lower plastic is provided with a groove corresponding to the second bulges, and the second bulges are arranged in the grooves.

As a preferable mode of the cap assembly, an end of the deformed rib adjacent to the first corner is provided with a second inclined surface.

In another aspect, a battery is provided, which includes the above cap assembly.

The utility model discloses beneficial effect does: this top cap subassembly has the deformation muscle through the pore wall orientation of the first through-hole of plastic under to keep away from one side of piece body, the plastic is provided with first filling portion towards a side of piece body down, and partial first filling portion is connected with the deformation muscle, make the piece body can extrude first filling portion when the assembly, thereby let the deformation muscle atress support and press, so that deformation muscle and first filling portion atress extrusion warp and fill with towards first clearance, the clearance that the assembly produced has been eliminated, effectively prevented the inflow of electrolyte, the security of battery has been promoted. The deformation rib, the first filling part and the lower plastic are designed into a whole, the first gap is not required to be filled by an additional insulation structure, the manufacturing cost of the top cover assembly is reduced, and the assembly steps of the top cover assembly are simplified.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a disassembly schematic view of a top cover assembly according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view (uncompressed state) of a cap assembly according to an embodiment of the present invention.

Fig. 3 is a partially enlarged view of a portion a of fig. 2.

Fig. 4 is a cross-sectional view (post-extrusion state) of a cap assembly in accordance with an embodiment of the present invention.

Fig. 5 is a partial enlarged view of fig. 4 at B.

Fig. 6 is a partial cross-sectional view of a lower plastic according to an embodiment of the present invention.

Fig. 7 is a cross-sectional view of a terminal member according to an embodiment of the present invention.

In the figure:

1. plastic is discharged; 11. a first through hole; 12. deforming the ribs; 121. a first inclined surface; 122. a second inclined surface; 13. a first filling part; 14. a second filling part; 15. a second protrusion; 16. avoiding holes; 17. a ventilation groove; 2. a terminal piece; 21. a terminal groove; 22. a third corner; 23. a terminal body; 24. a seal ring; 25. a fixing ring; 3. connecting sheets; 31. a sheet body; 32. a first protrusion; 33. a first corner; 34. a second corner; 35. welding a groove; 4. a first gap; 5. a second gap; 6. a third gap; 7. a top cover sheet; 71. a liquid injection hole; 72. an explosion-proof sheet.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; 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 application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply 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.

As shown in fig. 1 to 7, the utility model discloses a top cap subassembly includes plastic 1 down, connection piece 3 and top cover plate 7, connection piece 3 includes piece body 31, be provided with first arch 32 on the piece body 31, lower plastic 1 corresponds first arch 32 and is provided with first through-hole 11, top cover plate 7 and piece body 31 are located the relative both sides of plastic 1 down respectively, and first arch 32 runs through first through-hole 11, the hardness of piece body 31 is higher than the hardness of plastic 1 down, the pore wall of first through-hole 11 extends towards the one side of keeping away from piece body 31 has deformation muscle 12, be connected between the lateral wall of first arch 32 and the piece body 31 and form first turning 33, form first clearance 4 between first turning 33 and the lower plastic 1, lower plastic 1 sets up first filling portion 13 towards a side protrusion of piece body 31, first filling portion 13 is adjacent to deformation muscle 12, piece body 31 is adjacent to first filling portion 13 and supports tightly, and at least part first filling portion 13 is filled in first plastic clearance 4 by piece body 31 and lower plastic 1 back extrusion. This top cap subassembly is provided with deformation muscle 12 through the pore wall at first through-hole 11 of plastic 1 down, a side of plastic 1 towards piece body 31 is provided with first filling portion 13 down, first filling portion 13 is adjacent to first clearance 4, make piece body 31 can extrude first filling portion 13 when the assembly, first filling portion 13 conducts pressure to deformation muscle 12, so that deformation muscle 12 also can be extruded by the atress, thereby make deformation muscle 12 and first filling portion 13 warp and fill to first clearance 4, in order to eliminate the clearance that the top cap subassembly assembly produced, effectively prevented the inflow of electrolyte, the security of battery has been promoted. The deformed ribs 12, the first filling parts 13 and the lower plastic 1 are designed into a whole, an additional insulating structure is not needed to fill the first gaps 4, the manufacturing cost of the top cover assembly is reduced, and the assembling steps of the top cover assembly are simplified. It can be understood that, the rib 12, the first filling portion 13 and the lower plastic 1 are all formed by one piece of plastic material, the plastic material has elasticity, and because the hardness of the sheet body 31 is higher than that of the plastic material, the rib 12 and the first filling portion 13 are all easy to deform in the extrusion process, the first protrusion 32 of the connecting sheet 3 can pass through the first through hole 11 and protrude out of the end surface of the top cover sheet 7 to serve as an electrode terminal for connection of load equipment, the connecting position of the first protrusion 32 and the sheet body 31 has corners inevitably, and in addition, the assembly tolerance between the connecting sheet 3 and the lower plastic 1 can have gaps between the connecting sheet 3 and the lower plastic 1. Therefore, by arranging the first filling part 13 on the lower plastic 1, the sheet body 31 extrudes the first filling part 13 in the assembling process, and because the first filling part 13 is connected with the deformed rib 12, the pressure applied to the first filling part 13 can be transmitted to the deformed rib 12, at the moment, the deformed rib 12 and the first filling part 13 can be deformed together, so that the first filling part 13 can be filled into the first gap 4, and the electrical gap of the top cover assembly is eliminated.

Alternatively, the first gap 4 may be formed by a slope having a recess (clearance) at the first corner 33 and a chamfer at a position of the deformed rib 12 near the first corner 33.

In this embodiment, the top cap assembly further includes a terminal member 2, the terminal member 2 is disposed on a side of the lower plastic 1 departing from the sheet body 31, and is connected to the first protrusion 32, so as to connect the electrode terminal with an external load device. The terminal piece 2 is provided with a terminal groove 21, the deformed rib 12 is inserted in the terminal groove 21, and the inner side and the outer side of the deformed rib 12 are respectively abutted against the outer side wall of the first protrusion 32 and the groove wall of the terminal groove 21. When the sheet body 31 extrudes the first filling portion 13, the first filling portion 13 transmits the extrusion force to the deformation rib 12, and the inner side and the outer side of the deformation rib 12 are both abutted tightly, so that the deformation rib 12 is easily deformed, and the filling effect of the first gap 4 is improved.

In this embodiment, one end surface of the deformed rib 12 away from the first filling portion 13 abuts against the groove bottom of the terminal groove 21, the outer side wall of the first protrusion 32 is connected with the end surface of the first protrusion 32 away from the sheet body 31 to form a second corner 34, a second gap 5 is formed between the second corner 34 and the deformed rib 12 and the groove bottom of the terminal groove 21, and at least part of the deformed rib 12 is filled in the second gap 5. Before extrusion, the inner side and the outer side of the deformed rib 12 are respectively abutted against the outer side wall of the first protrusion 32 and the groove wall of the terminal groove 21, the end part of the deformed rib 12 is abutted against the groove bottom of the terminal groove 21, in other words, the distance between the first filling part 13 far away from the lower plastic 1 and the deformed rib 12 is larger than the distance between the groove bottom of the terminal groove 21 and the side face of the sheet body 31 provided with the first protrusion 32, when the sheet body 31 extrudes the first filling part 13, the stress balance of the deformed rib 12 is broken to deform, so that part of the deformed rib 12 is filled into the second gap 5, and the second gap 5 generated by assembly is eliminated.

In the present embodiment, the groove bottom of the terminal groove 21 and the groove wall of the terminal groove 21 are connected to form a third corner 22, a third gap 6 is formed between the third corner 22 and the deformed rib 12, and at least a part of the deformed rib 12 is filled in the third gap 6. Likewise, when the sheet body 31 presses the first filling portion 13, the deformed rib 12 is deformed by being disturbed in the force balance, so that the deformed rib 12 is filled in the third gap 6 to eliminate the third gap 6 caused by the fitting.

Specifically, one end of the deformed rib 12, which is far away from the first filling portion 13, is provided with a second filling portion 14, the second filling portion 14 abuts against the bottom of the terminal groove 21, and at least part of the second filling portion 14 is filled in the second gap 5, so that during assembly, the second filling portion 14 abuts against the bottom of the terminal groove 21, so that the second filling portion 14 can be filled in the second gap 5, and both the first filling portion 13 and the second filling portion 14 can be deformed, so that the first filling portion 13 and the second filling portion 14 can fill the gap during assembly, and the filling effect of the first gap 4, the second gap 5 and the third gap 6 is improved.

Specifically, as shown in fig. 2 and 6, one end of the deformed rib 12 adjacent to the third corner 22 is provided with a first inclined surface 121, the length of the first inclined surface 121 is L1, the thickness of the deformed rib 12 is L2, and L1 > 1/2 × L2. On the one hand, the first inclined surface 121 can be used as a guide surface to facilitate the assembly between the lower plastic 1 and the terminal element 2, and on the other hand, the length of the first inclined surface 121 and the thickness dimension range of the deformation rib 12 are obtained through a plurality of experiments, and the second filling part 14 tends to deform towards the second gap 5, so that most of the second filling part 14 is filled in the second gap 5.

Preferably, the first inclined surface 121 forms an angle θ with the horizontal plane, θ > 45 °, and the first inclined surface 121 in this angle range, in cooperation with the proportional relationship between L1 and L2, enables the second filling part 14 to be deformed directionally toward the second gap 5.

Specifically, the length of the overlapping area of the first filling part 13 and the deformed rib 12 is L3, L3 is greater than or equal to 1/2 × L2, the design is favorable for the filling effect of the first filling part 13 on the first gap 4, the second gap 5 or the third gap 6, if the length of L3 is insufficient, most of the filling part can be offset by the lower plastic 1 in the process that the sheet body 31 extrudes the first filling part 13, so that the extrusion force transmitted to the deformed rib 12 is reduced, and the deformation of the first filling part 13, the second filling part 14 and the deformed rib 12 is further reduced.

Specifically, as shown in fig. 1, the top cover plate 7 is disposed on the lower plastic 1, one of the top cover plate 7 and the lower plastic 1 is provided with a plurality of second protrusions 15 at intervals, the other one is provided with a groove corresponding to the second protrusion 15, the second protrusion 15 is disposed in the groove, and the second protrusion 15 and the groove are matched to prevent the relative rotation between the top cover plate 7 and the lower plastic 1, so as to ensure the air tightness of the battery. In this embodiment, the second protrusion 15 is disposed on the lower plastic 1, and the groove is disposed on the top cover plate 7.

Specifically, as shown in fig. 7, the terminal element 2 includes a terminal body 23 and a sealing ring 24, the sealing ring 24 is sleeved on the outer peripheral side wall of the terminal body 23, and part of the sealing ring 24 is convexly disposed on the end surface of the terminal body 23 adjacent to the connecting piece 3 to form a terminal groove 21, the first protrusion 32 is abutted against the terminal body 23, the deformation rib 12 is located between the first protrusion 32 and the sealing ring 24, and the sealing ring 24 can seal the terminal.

Specifically, the terminal element 2 further comprises a fixing ring 25, the fixing ring 25 is sleeved outside the sealing ring 24, and the fixing ring 25 is used for clamping the sealing ring 24 outside the terminal body 23 so as to improve the sealing performance of the top cover assembly.

Preferably, as shown in fig. 1, the first protrusion 32 is stamped from the sheet body 31, the stamping process is simple, and the weight of the connecting sheet 3 is not increased.

Specifically, as shown in fig. 1 and fig. 2, a side of the first protrusion 32 facing away from the terminal element 2 is provided with a concave welding groove 35, a groove bottom of the welding groove 35 is welded with the terminal element 2, the connecting sheet 3 is locally thinned by the welding groove 35, and laser welding or penetration welding is facilitated to penetrate through the first protrusion 32 and the terminal body 23 so as to improve the welding effect between the connecting sheet 3 and the terminal body 23.

Specifically, as shown in fig. 6, one end of the deformed rib 12 adjacent to the first corner 33 is provided with a second inclined surface 122, and the second inclined surface 122 is provided to facilitate the installation of the connecting sheet 3, so that the interference of the connecting sheet 3 caused by a sharp corner is avoided, and the problem of insufficient soldering of the connecting sheet 3 is effectively prevented.

Specifically, as shown in fig. 1, the lower plastic 1 is provided with a ventilation groove 17, the ventilation groove 17 is used for pressure relief, so as to prevent the battery from exploding, and the weight of the lower plastic 1 can be reduced by the ventilation groove 17, so as to reduce the weight of the top cover assembly.

Specifically, as shown in fig. 1, an explosion-proof hole is formed in the top cover plate 7 corresponding to the ventilation groove 17, an explosion-proof sheet 72 is arranged on the explosion-proof hole, and the explosion-proof sheet 72 can perform explosion-proof pressure relief on the battery.

Specifically, be provided with on top cover piece 7 and annotate liquid hole 71, lower plastic 1 corresponds annotates liquid hole 71 and is provided with dodge hole 16, and the back on the battery case was assembled to the top cover subassembly, and the staff can add electrolyte into the casing through annotating liquid hole 71.

The utility model discloses still publicly a battery, including the top cap subassembly of above-mentioned arbitrary embodiment, this top cap subassembly can eliminate by the clearance that the assembly produced, has effectively prevented the inflow of electrolyte, has promoted the security of battery, and this structure need not to increase insulating part, reduces the manufacturing cost of battery.

In the description herein, it is to be understood that the terms "upper" and "lower" are used in a descriptive sense only and not for purposes of limitation, and are not to be construed as indicating or implying that a particular device or element must have a particular orientation, be constructed and operated in a particular manner, based on the orientation or positional relationship shown in the figures.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention has been described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The top cover component comprises a lower plastic, a connecting piece and a top cover piece, wherein the connecting piece comprises a piece body, a first protrusion is arranged on the piece body, the lower plastic corresponds to the first protrusion, a first through hole is formed in the first protrusion, the top cover piece and the piece body are respectively located on two opposite sides of the lower plastic, the first protrusion penetrates through the first through hole, the hardness of the piece body is higher than that of the lower plastic, the top cover component is characterized in that a deformation rib extends towards one side of the piece body away from the hole wall of the first through hole, a first corner is formed between the first convex outer side wall and the piece body, a first gap is formed between the first corner and the lower plastic, the lower plastic faces towards a first filling portion is arranged on one side surface of the piece body in a protruding mode, the first filling portion is adjacent to the deformation rib, the piece body is adjacent to the first convex position and the first filling portion, and at least part of the first filling portion is filled in the first gap after the piece body and the lower plastic are extruded.

2. The top cover assembly according to claim 1, further comprising a terminal member, wherein the terminal member is disposed on a side of the lower plastic facing away from the sheet body and connected to the first protrusion, the terminal member is provided with a terminal groove, the deformation rib is inserted into the terminal groove, and inner and outer sides of the deformation rib respectively abut against an outer sidewall of the first protrusion and a groove wall of the terminal groove.

3. The header assembly of claim 2, wherein an end of the deformed rib distal from the first filler portion abuts a groove bottom of the terminal groove;

a second corner is formed between the outer side wall of the first protrusion and the end face, far away from the sheet body, of the first protrusion, a second gap is formed between the second corner and the deformation rib as well as the groove bottom of the terminal groove, and at least part of the deformation rib is filled in the second gap; and/or the presence of a gas in the atmosphere,

4. The header assembly of claim 3, wherein an end of the deformed rib remote from the first filler portion is provided with a second filler portion, the second filler portion abuts against a groove bottom of the terminal groove, and at least a portion of the second filler portion is filled in the second gap.

5. The header assembly of claim 4, wherein an end of the deformed bead adjacent the third corner is provided with a first angled surface, the first angled surface has a length L1, the deformed bead has a thickness L2, and L1 > 1/2 x L2.

6. The lid assembly according to claim 5, wherein the first inclined surface is angled from a horizontal plane by θ, θ > 45 °.

7. The top cap assembly of claim 2, wherein the top cover sheet is disposed on the lower plastic, one of the top cover sheet and the lower plastic is spaced apart from the lower plastic and has a plurality of second protrusions, and the other of the top cover sheet and the lower plastic has a groove corresponding to the second protrusions, and the second protrusions are disposed in the grooves.

8. The header assembly of claim 2, wherein a side of the first protrusion facing away from the terminal member is recessed with a weld groove, a groove bottom of the weld groove being welded to the terminal member.

9. The cap assembly of claim 1, wherein the deformed rib has a thickness L2, and the length of the overlapping area of the first filling portion and the deformed rib is L3, wherein L3 is greater than or equal to 1/2 × L2.

10. The top cap assembly of claim 1, wherein the top cover sheet is disposed on the lower plastic, one of the top cover sheet and the lower plastic is spaced apart from the other by a plurality of second protrusions, and the other of the top cover sheet and the lower plastic is disposed with a groove corresponding to the second protrusions, and the second protrusions are disposed in the grooves.

11. The header assembly of claim 1, wherein an end of the deformed rib adjacent the first corner is provided with a second angled surface.

12. A battery comprising the cap assembly of any one of claims 1-11.