CN217848116U

CN217848116U - Secondary battery's battery top cap subassembly and secondary battery

Info

Publication number: CN217848116U
Application number: CN202221802899.5U
Authority: CN
Inventors: 陈中元; 陈兵斌
Original assignee: Dongguan Fuhang Electronic Technology Co ltd
Current assignee: Dongguan Fuhang Electronic Technology Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-11-18
Anticipated expiration: 2032-07-12

Abstract

The present disclosure relates to a secondary battery's battery top cap subassembly and secondary battery, battery top cap subassembly includes: the top cover plate is provided with a first pole post through hole penetrating along the thickness direction; the pole column is fixed on the top cover plate; the lower support is provided with a second pole post through hole penetrating along the thickness direction, and the position of the second pole post through hole corresponds to the position of the first pole post through hole; the top cover plate is arranged above the lower support and is buckled and connected with the lower support through a buckle structure. The secondary battery comprises the battery top cover assembly. The top cover plate and the lower support are connected through the buckle structure, the injection molding processing steps can be simplified, the production efficiency of the battery top cover assembly is improved, the production cost is reduced, and the production and assembly processes are more flexible.

Description

Secondary battery's battery top cap subassembly and secondary battery

Technical Field

The disclosure relates to the technical field of storage batteries, in particular to a battery top cover assembly of a secondary battery and the secondary battery.

Background

A lithium ion battery is a commonly used secondary battery, and in a lithium ion battery structure, as a common square aluminum shell battery, the battery generally includes a casing, a battery cell disposed in the casing, and a top cover structure for closing the casing, where the top cover structure generally includes a lower bracket, a top cover plate, and positive and negative bipolar columns.

When the existing top cover structure is processed, positive and negative poles are usually placed into a mold, then components such as a lower support, a top cover plate and a sealing ring are placed into the mold in sequence, a pole cap is formed above the poles through injection molding, the poles are fixed on the top cover plate by the pole cap, and the top cover structure is connected into an integral structure.

Above-mentioned through between lamina tecti and the lower carriage, connect structure as an organic whole through utmost point cap and utmost point post, this kind of lamina tecti's processing method, the processing step is loaded down with trivial details, production efficiency is low, and the lamina tecti can not dismantle after moulding plastics with the lower carriage, and the flexibility is relatively poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of the prior art, one object of the present disclosure is to provide a battery top cap assembly, and the other object is to provide a secondary battery. The top cover plate and the lower support are connected through the buckle structure, the injection molding processing steps can be simplified, the production efficiency of the battery top cover assembly is improved, the production cost is reduced, and the production and assembly processes are more flexible.

The battery top cap subassembly of secondary cell stated in this disclosure includes:

the top cover plate is provided with a first pole post through hole penetrating along the thickness direction;

the pole column is fixed on the top cover plate;

the lower bracket is provided with a second pole post through hole which penetrates along the thickness direction, and the position of the second pole post through hole corresponds to the position of the first pole post through hole;

the top cover plate is arranged above the lower support and is connected with the lower support in a buckling mode through a buckling structure.

Preferably, the upper surface of the lower bracket protrudes upwards outside the second pole via hole to form a peripheral part surrounding the second pole via hole, and the size of the peripheral part is matched with that of the first pole via hole, so that the peripheral part can be placed into the first pole via hole;

the buckling structure comprises a buckling part formed on the edge of the upper part of the peripheral part, the buckling part extends outwards to form a step structure with the peripheral part, and the step structure is used for clamping the inner edge of the first pole post via hole to enable the top cover plate to be buckled and connected with the lower bracket.

Preferably, the buckling part is in a wedge-shaped block structure, and the width of the upper part of the buckling part is gradually reduced from bottom to top, so that the outer side surface of the buckling part forms a slope surface.

Preferably, utmost point post is the square column structure, first utmost point post via hole with second utmost point post via hole all be with the quad slit of utmost point post looks adaptation.

Preferably, the fastening portions are formed on two opposite side edges of the peripheral portion.

Preferably, the battery top cap assembly further comprises:

and the sealing ring is arranged between the pole and the top cover plate.

Preferably, the upper surface of the top cover plate is arranged outside the first pole post via hole and protrudes upwards from the position spaced by a certain distance from the buckling part to form a step part surrounding the first pole post via hole, the sealing ring covers the step part, and the inner part of the sealing ring extends to be filled between the step part and the buckling part.

Preferably, the battery top cap assembly further comprises:

the pole support is matched with the pole, and the pole is embedded in the pole support;

the pole cap is arranged on the outer side of the pole in a surrounding manner and is respectively connected with the pole and the pole bracket;

the bottom surface of the pole support is connected with the top cover plate.

The present disclosure provides a secondary battery including:

the shell is provided with an accommodating cavity and an opening communicated with the accommodating cavity;

the battery cell is arranged in the accommodating cavity;

the battery top cover assembly is arranged at the opening and used for sealing the battery core in the shell.

The battery top cover assembly of the secondary battery and the secondary battery have the advantages that the lower support and the top cover plate are connected through the buckling structure, the lower support and the top cover plate are not required to be aligned and placed into a mold during injection molding, the injection molding steps can be effectively simplified, the operation precision requirement of injection molding is reduced, automatic assembly can be achieved through the buckling connection mode, the production and processing efficiency of the battery top cover assembly can be remarkably improved, and the production cost is reduced. The top cover plate and the lower support can be disassembled and assembled according to assembly requirements in the assembly process, so that the production and assembly process is more flexible.

Drawings

Fig. 1 is an exploded view of a battery top cap assembly according to the present disclosure;

FIG. 2 is a schematic view of the structure at position A in FIG. 1;

FIG. 3 is a schematic view of the structure at position B in FIG. 1;

fig. 4 is a cross-sectional view of a battery top cap assembly according to the present disclosure;

fig. 5 is a schematic diagram of the structure at position C in fig. 4.

Description of the reference numerals: 1-top cover plate, 11-first pole post via hole, 12-step part, 2-pole post, 3-lower support, 31-second pole post via hole, 32-peripheral part, 4-buckle structure, 5-sealing ring, 6-pole cap and 7-pole post support.

Detailed Description

As shown in fig. 1-5, a battery top cap assembly according to the present disclosure includes:

the top cover plate 1, it is square platelike structure usually, and it has the first utmost point post via hole 11 that runs through along the thickness direction for supply connecting wire and utmost point post 2 to pass, make utmost point post 2 can be connected with the inside sinle silk electricity of battery case. In the bipolar post 2 structure, the number of the first post via holes 11 is generally two, and the two first post via holes are respectively distributed at two ends of the top cover plate 1 in the length direction to respectively correspond to the positive post 2 and the negative post 2.

Utmost point post 2, it is fixed on top cap plate 1, and is concrete, and in the 2 structures of bipolar post, the quantity of utmost point post 2 is two, is anodal utmost point post 2 and negative terminal 2 respectively, and two utmost point posts 2 are fixed respectively on the upper surface of top cap plate 1, if, the both ends of 1 upper surface of top cap plate are respectively inwards sunken form with the mounting groove of 2 tip looks adaptations of utmost point post, the bottom of utmost point post 2 inserts in the mounting groove to cooperation subsequent utmost point cap 6 is fixed utmost point post 2 on top cap plate 1.

The lower bracket 3, the shape and size of the lower bracket 3 are generally adapted to the top cover plate 1, so that the top cover plate 1 and the lower bracket 3 are stacked and connected in the thickness direction, as in this embodiment, the lower bracket 3 is a directional plate-shaped structure, and two ends of the lower surface of the lower bracket extend downwards to form two support legs, so as to support and fix.

The lower bracket 3 has a second pole through hole 31 penetrating along the thickness direction, and the position of the second pole through hole 31 corresponds to the position of the first pole through hole 11, that is, the second pole through hole 31 and the first pole through hole 11 are coincident and aligned in the thickness direction, so that the two pole through holes are communicated, and the pole 2 on the top cover plate 1 can be connected with the electric core inside the battery shell. In a specific embodiment, the shape and size of the second post via 31 are adapted to the shape and size of the first post via 11, which facilitates processing and alignment of the two post vias in the thickness direction.

The top cover plate 1 is arranged above the lower bracket 3 and is buckled and connected with the lower bracket 3 through a buckle structure 4. That is, the buckle structure 4 is disposed at the connecting position of the top cover plate 1 and the lower bracket 3, and when the top cover plate 1 covers the lower bracket 3, the buckle structure 4 is buckled to connect the two.

This lower carriage 3 and top cap board 1 between be connected through 4 locks of buckle structure, need not to align lower carriage 3, top cap board 1 when moulding plastics and put into the mould, can effectively simplify the injection moulding processing step, reduce injection moulding processing's operation required precision, but the mode of buckle connection can realize automatic assembly, can show the production machining efficiency who improves battery top cap subassembly, reduction in production cost. The top cover plate 1 and the lower support 3 can be disassembled and assembled according to assembly requirements in the assembly process, so that the production and assembly processes are more flexible.

Further, in the present embodiment, referring to fig. 2 in detail, an outer peripheral portion 32 surrounding the second pole through hole 31 is formed on the upper surface of the lower bracket 3 protruding upward on the outer side of the second pole through hole 31, and the size of the outer peripheral portion 32 is matched with the size of the first pole through hole 11 so that the outer peripheral portion 32 can be placed into the first pole through hole 11, specifically, the outer peripheral portion 32 is in a rectangular frame-shaped structure, surrounds the outer side of the second pole through hole 31, has a certain thickness and width, and is slightly smaller than the first pole through hole 11 in size, so that when the top cover plate 1 and the lower bracket 3 are connected in a vertically stacked manner, the outer peripheral portion 32 can be placed into the first pole 2 hole.

The buckling structure 4 specifically includes a buckling part formed on the upper edge of the peripheral part 32, the buckling part extends outwards from the upper part of the peripheral part 32 to have a certain width, and forms a step structure as shown in fig. 5 with the peripheral part 32 below the buckling part, the step structure is used for clamping the inner edge of the first pole through hole 11, so that the top cover plate 1 is buckled and connected with the lower bracket 3, specifically, as the buckling part extends outwards to have a certain width, the whole thickness of the buckling part is slightly larger than the inner diameter of the first pole through hole 11, when the top cover plate 1 is covered and closed above the lower bracket 3, the first pole through hole 11 is aligned with the second pole through hole 31, at this moment, the peripheral part 32 and the buckling part can be integrally inserted into the first pole through hole 11, the inner edge of the first pole through hole 11 can extrude the buckling part to enable the buckling part and the peripheral part 32 to integrally deform inwards, when the top cover plate 1 is pressed to the lower end of the first pole through hole 11 and completely passes through the buckling part, the inner edge of the lower pole 32 contacts with the first pole through hole 11, and the buckling part can be restored to the first pole through the outer through hole, and the buckling part can be connected with the first pole through the top cover plate 11.

Foretell buckle structure 4 has and connects firmly, simple structure, and during the assembly only need with 1 top-down of lamina tecti impress down the support 3 on can, the assembly action is simple, can realize automatic assembly, and then improves battery top cap subassembly's production machining efficiency.

Further, in this embodiment, please refer to fig. 5 in detail, the fastening portion is a wedge-shaped structure, the width of the upper portion of the fastening portion gradually decreases from bottom to top, so that the outer side surface of the fastening portion forms a slope, the fastening portion is integrally in a structure of "narrow top and wide bottom", and the outer side surface is the slope, the structure enables the inner edge of the first post via hole 11 to gradually press the fastening portion inward when the fastening portion is matched with the first post via hole 11, and when the top cover plate 1 moves to the point that the first post via hole 11 completely passes through the fastening portion, and the fastening portion and the peripheral portion 32 are integrally reset, the lower portion of the fastening portion can stably clamp the upper end of the first post via hole 11. The buckling part structure can facilitate the matching between the first pole post via hole 11 and the buckling part, and has the advantage of stable buckling connection.

Further, in this embodiment, utmost point post 2 is square column structure, first utmost point post via hole 11 and second utmost point post via hole 31 all be with the quad slit of utmost point post 2 looks adaptation, the structure of quad slit has rectangular border, can be convenient for process and form peripheral portion 32, buckling part isotructure, and enable the buckle cooperation between buckling part and the first utmost point post via hole 11 and stabilize

Further, in the present embodiment, the fastening portions are formed on two opposite side edges of the peripheral portion 32, so that the top cover plate 1 and the lower bracket 3 are fastened from two opposite sides, and the two are connected stably.

Further, in this embodiment, the battery top cover assembly further includes:

and the sealing ring 5 is arranged between the pole 2 and the top cover plate 1 and used for realizing waterproof sealing of the connecting position.

Further, in this embodiment, please refer to fig. 5 in detail, a step portion 12 surrounding the first post via hole 11 is formed at a position, which is on the outer side of the first post via hole 11 and spaced from the fastening portion by a certain distance, of the upper surface of the top cover plate 1, and the sealing ring 5 covers the step portion 12, so that the sealing ring 5 can better surround and seal the outer side of the first post 2 via the step portion 12.

And the inner part of the sealing ring 5 extends to and is filled between the step part 12 and the buckling part so as to enhance the waterproof sealing performance of the connecting position of the top cover plate 1 and the lower bracket 3.

Further, in this embodiment, the battery top cover assembly further includes:

the post support 7 is a metal support, the shape and the size of the post support 7 are matched with those of the post 2, and the post 2 is embedded in the post support 7.

Utmost point cap 6, utmost point cap 6 are the rectangle frame structure with utmost point post 2 looks adaptation, and its mode through the mould injection moulding is around forming in the outside of utmost point post 2, and is connected with utmost point post 2, utmost point post support 7 respectively for utmost point cap 6, utmost point post 2 and utmost point post support 7 form monolithic structure.

The bottom surface of utmost point post support 7 is connected with roof plate 1, and is concrete, after forming utmost point cap 6 through moulding plastics, with the outer edge of the bottom surface of utmost point post support 7 and the interior edge welding of first utmost point post via hole 11 to fix utmost point post 2 to roof plate 1.

The structure does not need to align all the parts in sequence and put the parts into the injection mold, and has the advantages of simple injection molding processing steps and more flexible production and assembly processes.

The present embodiment also provides a secondary battery including:

the battery cell is arranged in the accommodating cavity;

The battery of this embodiment has the advantage of being convenient for processing, production efficiency is high, low in production cost, production assembling process are more nimble owing to adopted foretell battery top cap subassembly.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the present disclosure, and in the absence of a contrary explanation, these directional terms are not intended to indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present disclosure.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present disclosure.

Claims

1. A battery top cap assembly of a secondary battery, comprising:

the top cover plate is provided with a first pole through hole penetrating along the thickness direction;

the pole column is fixed on the top cover plate;

the lower support is provided with a second pole post through hole penetrating along the thickness direction, and the position of the second pole post through hole corresponds to the position of the first pole post through hole;

the top cover plate is arranged above the lower support and is buckled and connected with the lower support through a buckle structure.

2. The battery top cover assembly according to claim 1, wherein the upper surface of the lower bracket is formed with a peripheral portion protruding upward outside the second pole through hole, the peripheral portion surrounding the second pole through hole, and the size of the peripheral portion is matched with the size of the first pole through hole so that the peripheral portion can be inserted into the first pole through hole;

the buckling structure comprises a buckling part formed on the edge of the upper part of the peripheral part, the buckling part extends outwards to form a step structure with the peripheral part, and the step structure is used for clamping the inner edge of the first pole post via hole to enable the top cover plate to be connected with the lower support in a buckling mode.

3. The battery top cap assembly of claim 2, wherein the locking portion is in a wedge-shaped block structure, and the width of the upper portion of the locking portion gradually decreases from bottom to top, so that the outer side surface of the locking portion forms a slope.

4. The battery top cap assembly of claim 3, wherein the posts are square cylindrical structures, and the first post via hole and the second post via hole are square holes adapted to the posts.

5. The battery top cap assembly of claim 4, wherein the snaps are formed on opposing side edges of the peripheral portion.

6. The battery top cap assembly of claim 2, further comprising:

and the sealing ring is arranged between the pole and the top cover plate.

7. The battery top cap assembly according to claim 6, wherein a step portion surrounding the first pole through hole is formed in the upper surface of the top cap plate in a protruding manner at a position outside the first pole through hole and spaced from the buckling portion by a certain distance, the sealing ring covers the step portion, and the inner portion of the sealing ring extends to be filled between the step portion and the buckling portion.

8. The battery top cap assembly of claim 1, further comprising:

the bottom surface of the pole post bracket is connected with the top cover plate.

9. A secondary battery, characterized by comprising:

a housing having an accommodating chamber and an opening communicating with the accommodating chamber;

the battery cell is arranged in the accommodating cavity;

the battery cap assembly of any of claims 1-8, disposed at the opening for enclosing the electrical core within the housing.