CN219937324U - Top cover, battery and electricity utilization device - Google Patents

Abstract

The utility model relates to a top cover, a battery and an electric device, wherein the top cover comprises a top cover sheet, at least one through hole is formed on the surface of the top cover sheet, a protruding part is formed on the surface of the top cover sheet around the through hole, and an accommodating space is formed between the protruding part and the top cover sheet for installing a pole; at least one pole, a pole corresponds an accommodation space, and the pole is installed in accommodation space, and the pole has the installation department, can be fixed by protruding portion. The utility model solves the problems of high cost, difficult control and occurrence of explosion points, welding slag and penetration, and substandard penetration and width of the cylindrical cap riveting structure caused by laser welding.

Description

Top cover, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover, a battery and electric equipment.

Background

With the gradual popularization of electric automobiles, higher requirements are placed on the safety, service life and charging efficiency of automobile batteries.

The cap of the cylindrical battery is used as a main part of the cylindrical battery, and the production process, the assembly process and the sealing performance of the cylindrical battery can influence the production cost and the safety of the cylindrical battery.

The prior cylindrical cap with a riveted structure needs to be firmly connected with the cap by a laser welding method, and specific steps can refer to an assembly process of a cylindrical battery disclosed in China utility model (CN 115566253A) so as to enhance the stability of the structure and ensure the sealing performance between the polar column and the cap.

However, the following problems exist in welding the pole and the top cover sheet by laser welding: (1) The condition that the sealing performance of the cap is damaged by explosion points, welding slag and welding penetration can occur when the laser welding power is too high; (2) The laser welding power is too low, so that the welding seam penetration and the welding width are not up to the standard, the required welding strength of the product is not met, and defective products are produced. (3) In addition, the laser welding process requires certain equipment, equipment maintenance, safety control and labor cost.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model discloses a top cover, a battery and electric equipment.

The technical scheme adopted by the utility model is as follows:

a top cap comprising:

the surface of the top cover sheet forms at least one through hole, the surface of the top cover sheet forms a protruding part around the through hole, and an accommodating space is formed between the protruding part and the top cover sheet for mounting the pole;

at least one pole, one pole corresponds one accommodation space, the pole install in the accommodation space, just the pole has the installation department, can be fixed by the protruding portion.

In some embodiments, the pole is cylindrical, and the top of the protruding portion is bent inward to fix the upper end face of the pole.

In some embodiments, the pole is cylindrical and has a flange, and the tab is bent inward to secure the flange upper surface of the pole.

In some embodiments, the flange is a ring.

In some embodiments, the flange includes a plurality of sector elements, a plurality of the sector elements being disposed along a circumference of the pole.

In some embodiments, a seal is also included that fits within the receiving space, filling the void between the post and the receiving space.

In some embodiments, a fitting portion is provided on an inner wall of the accommodating space, the fitting portion extends a preset distance in an axial direction of the pole, and the fitting portion is in clamping connection with the sealing member.

In some embodiments, the seal includes a body and a first collar disposed at an axial first end face of the body, the first collar being coaxially disposed with the body, and an outer diameter of the first collar being less than an outer diameter of the body.

In some embodiments, the seal further comprises a second collar disposed on the body axial second end face, the second collar being coaxially disposed with the first collar and the body, and an outer diameter of the second collar being less than an outer diameter of the body.

A battery, comprising:

a housing having an open end;

the battery cell is accommodated in the shell; and

the top cover is arranged at the opening end of the shell, and the surface of the top cover with the protruding part is far away from the inner side of the shell.

An electrical device comprising a battery as described above.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. according to the pole assembly, the cap main body is formed into the protruding part with the opening on the upper surface of the top cap through a stretching method, the sealing piece and the pole are placed into the protruding part, and then the pole and the sealing ring are wrapped in the protruding part through a rolling method. The stretching of the protruding part can be completed in the cap forming stage, the working procedure of laser welding the pole and the cap main body is omitted, the production cost is reduced, the sealing performance of the cap is met, and the cap has good practical prospect.

2. The pole assembly meets the strength design requirement of a product through optimizing the structural form and the forming process, and simultaneously, the structure of the sealing piece is optimized so as to meet the sealing performance of the product.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.

Fig. 1 is an exploded view of a battery top cover according to the present utility model.

Fig. 2 is a top view of the battery top cover of the present utility model.

Fig. 3 is a schematic view of the present utility model before rolling the protrusions.

Fig. 4 is a schematic view of the utility model after rolling the protrusions.

Description of the specification reference numerals: 1. a pole; 2. a seal; 21. a first collar; 22. a body; 23. a second convex ring; 3. a top cover sheet; 4. an insulating spacer; 5. an accommodation space; 6. a protruding portion; 7. a bending part; 8. and a mating part.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the utility model, and furthermore, like reference numerals refer to like elements throughout the embodiments.

The research shows that the laser welding of the conventional cylindrical cap riveting structure has high cost, difficult control and the problems of explosion point, welding slag and penetration, penetration and unqualified width.

In order to solve the above problems, the present utility model provides a top cover and a battery.

Example 1:

referring to fig. 1-3, a top cover comprises a top cover sheet 3 and at least one pole 1. Wherein, at least one through hole is formed on the surface of the top cover sheet 3, a protruding part 6 is formed on the surface of the top cover sheet 3 around the through hole, and an accommodating space 5 is formed between the protruding part 6 and the top cover sheet 3 for installing the pole 1;

each pole 1 corresponds to one accommodation space 5, the pole 1 is mounted in the accommodation space 5, and the pole 1 has a mounting portion that can be fixed by the protruding portion 6.

In the present embodiment, when the number of the poles 1 is one, the poles 1 may be positive poles or negative poles. When the pole 1 is a positive pole, correspondingly, the current collecting disc at one end of the battery corresponding to the pole 1 is a positive current collecting disc; when the electrode column 1 is a positive electrode column, the current collecting disc corresponding to the electrode column 1 at one end of the battery is a negative current collecting disc.

When the number of the polar posts 1 is two, the polarities of the two polar posts 1 are opposite, and the two polar posts 1 are correspondingly connected with the positive current collecting disc and the negative current collecting disc respectively.

In this embodiment, as shown in fig. 1, the pole 1 is columnar and the pole 1 has a flange, the protruding portion 6 is bent inward to form a bent portion 7, and the bent portion 7 presses the flange of the pole 1 to fix the flange upper surface of the pole 1. When the pole 1 is in the shape of a quadrangular prism, a flange is provided along the circumferential direction of the bottom surface thereof, and the flange extends away from the axial direction of the pole 1 by a predetermined distance, and the bending portion 7 presses the flange. As shown in fig. 1, the number of flanges of the pole 1 is one and is located at the bottom of the pole 1, and when the pole 1 and the top cover sheet 3 are assembled, the flanges of the pole 1 are located in the accommodating space 5, and it should be noted that the number and the positions of the flanges of the pole 1 are not limited to the pole 1 shown in fig. 1, and can be designed according to the requirements of those skilled in the art, so long as the bending portion 7 bends according to the structural form of the pole 1, so as to satisfy the requirement of being able to fix the pole 1.

Further, the flange is an annular member or, alternatively, the flange comprises a plurality of sector elements arranged along the circumference of the pole 1, preferably with the same degree of included angle between two adjacent sector elements.

The corresponding pole 1 is columnar and the pole 1 is provided with a flange, the battery top cover further comprises a sealing element 2, the sealing element 2 is arranged in the containing space 5, a gap between the pole 1 and the containing space 5 is filled, and then the protruding part 6 can be attached to the surface of the sealing element 2. The inner wall of the accommodating space 5 is provided with a matching part 8, the matching part 8 extends a preset distance in the axial direction of the pole 1, and the matching part 8 is clamped with the sealing element 2.

Specifically, the seal member 2 includes a body 22, a first convex ring 21 provided at a first end face in an axial direction of the body 22, the first convex ring 21 being coaxially arranged with the body 22, and an outer diameter of the first convex ring 21 being smaller than an outer diameter of the body 22. It can be easily understood that the present embodiment may also use the existing insulating sealing ring, and after the sealing member 2 is improved in this embodiment, the probability of short circuit caused by factors such as electrolyte leakage and accidental water seepage of the battery is greatly reduced.

However, in case the leakage amount of the electrolyte or the unexpected water penetration amount is sufficiently large, there is still a possibility of short circuit of the battery, and further, the sealing member 2 further includes a second convex ring 23, the second convex ring 23 is disposed at the second axial end surface of the body 22, the second convex ring 23 is disposed coaxially with the first convex ring 21 and the body 22, and the outer diameter of the second convex ring 23 is smaller than the outer diameter of the body 22, so that the possibility of short circuit of the battery due to the large leakage amount of the electrolyte or the unexpected water penetration amount is further reduced.

Of course, the first convex ring 21 and the second convex ring 23 may be further designed in an optimized manner, for example, the first convex ring 21 is raised so that the first convex ring 21 is higher than the battery case by a certain distance. It should be noted that a certain distance refers to a design made by a person skilled in the art according to actual needs.

Wherein, since the sealing member 2 plays a role in fixing and/or sealing the pole 1, the structural form of the sealing member 2 should be matched with that of the pole 1, namely, when the structural form of the pole 1 is a cylinder, the body 22 of the sealing member 2 is annular; when the structural form of the pole 1 is a quadrangular prism, the body 22 of the seal member 2 is rectangular.

Optionally, the pole 1 is columnar, the pole 1 is not provided with a flange, the top of the protruding part 6 is inwards bent to form a bending part 7 so as to fix the upper end face of the pole 1, and the bending part 7 is pressed on the upper end face of the pole 1; the column may be a cylinder or a prism, not shown in a regular quadrangular prism, and at least a part of the pole 1 is located in the accommodating space 5, and one surface of the pole 1 is exposed, and the bending portion 7 presses the exposed upper end surface.

The bending portion 7 is formed as follows: the protruding portion 6 is rolled in the axial direction of the pole 1 to form a bent portion, and the upper end surface of the pole 1 or the upper surface of the flange of the pole 1 is pressed.

In this embodiment, the top sheet 3 and the protruding portion 6 are integrally formed. It can be understood that the protruding part 6 is integrally arranged on the surface of the top cover sheet 3, so that complex processes of forming the top cover sheet 3 and the protruding part 6 in a split manner are simplified, the processing process is reduced, the weight of parts is reduced, and light weight, high strength and low cost are realized.

Referring to fig. 3 and 4, the top cover is manufactured as follows:

the forming process of the protruding part 6 is a cold stamping process for deep drawing a flat blank or a semi-finished blank into an open hollow by using a die by adopting a drawing process, and the top cover sheet 3 is drawn out of the protruding part 6 as shown in fig. 3;

the sealing member 2 is put into the accommodating space 5, and the pole 1 is placed in the sealing member 2;

since the flange of the pole 1 is located at the bottom of the pole 1, the top of the protruding portion 6 is rolled toward the axis of the pole 1 by rolling to form a bent portion 7, and the bent portion 7 approaches the pole 1 to compress the pole 1 and the sealing member 2 which are already placed in the accommodating space 5.

Example 2:

a battery, comprising:

a housing having an opening;

the battery core is accommodated in the battery shell; and

the top cover provided in embodiment 1 is provided at the open end of the housing, the plane of the top cover being disposed toward the inside of the housing.

In this embodiment, an insulating spacer 4 is disposed between the top cover sheet 3 of the battery top cover and the battery cell, and the insulating spacer 4 plays a role in insulation and isolation.

In this embodiment, the battery cell includes a positive plate, a negative plate and a diaphragm, where the positive plate, the diaphragm and the negative plate are stacked together and wound to form the battery cell. Specifically, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material coated on the positive electrode current collector, and a commonly used positive electrode active material such as a lithium-containing oxide generally has a higher lithium content and a higher capacity. For example, lithium manganate has a Li content of only 4.2%, while lithium cobaltate and lithium nickelate reach about 7.1% and lithium-rich manganese groups can reach as high as about 10%. The main element content should be given as the actual test average plus tolerance, given a fixed material composition, to achieve the corresponding electrochemical activity and to maintain batch-to-batch stability. The positive electrode materials in lithium ion batteries are all lithium-containing oxides, and generally the higher the lithium content, the higher the capacity. For example, lithium manganate has a Li content of only 4.2%, while lithium cobaltate and lithium nickelate reach about 7.1% and lithium-rich manganese groups reach up to about 10%. The main element content should be given as the actual test average plus tolerance, given a fixed material composition, to achieve the corresponding electrochemical activity and to maintain batch-to-batch stability. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material coated on the negative electrode current collector, wherein the common negative electrode active material is carbon material, and the carbon negative electrode replaces a lithium negative electrode, so that deposition and dissolution of lithium on the surface of the negative electrode in the charging and discharging process are changed into intercalation and deintercalation of lithium in carbon particles, the possibility of lithium dendrite formation is reduced, and the safety of the battery is greatly improved.

The manufacturing process of the battery cell comprises the following steps: placing the sheared positive plate, the sheared negative plate and the sheared diaphragm on a winding machine, wherein the lengths, the widths and the thicknesses of the positive plate and the sheared negative plate are required to be according to the design requirements of an electric core; putting into a winding machine, and automatically winding by the winding machine. The winding machine winds the positive and negative plates and the diaphragm into a plate group. The embodiment is directed to the design of the cylindrical battery cell, so that the winding machine adopts a round winding needle, and if the embodiment is directed to the square battery cell, the winding machine adopts a flat winding needle. It should be noted that, when winding, constant tension is applied to the pole group to ensure the size of the pole group, and after winding, the pole group is shaped by rubberized fabric to ensure the tightness of the pole group.

In this embodiment, the manufacturing process of the battery is as follows:

1. and (3) manufacturing a winding core: preparing active substances, conductive agents and binders, mixing powder, coating by using a dry electrode technology, rolling, cutting pole pieces, die cutting pole lugs, baking pole pieces to obtain a negative electrode, and winding;

2. and (3) assembling a battery cell: kneading, welding a top cover, a positive pole, welding a negative pole top cover, putting the positive pole into a shell, rolling a groove, baking, injecting liquid once, forming an opening, injecting liquid twice, sealing, testing and packaging.

The utility model also provides electric equipment using the battery provided in the embodiment 2. The electric equipment can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims (11)

1. A top cap, characterized in that: comprising the following steps:

a top cover sheet (3), wherein at least one through hole is formed on the surface of the top cover sheet (3), a protruding part (6) is formed on the surface of the top cover sheet (3) around the through hole, and an accommodating space (5) is formed between the protruding part (6) and the top cover sheet (3) for installing the pole (1);

at least one pole (1), one pole (1) corresponds one accommodation space (5), pole (1) install in accommodation space (5), just pole (1) have the installation department, can be fixed by protruding portion (6).

2. The overcap of claim 1, wherein: the pole (1) is columnar, and the top of the protruding part (6) is bent inwards to fix the upper end face of the pole (1).

3. The overcap of claim 1, wherein: the pole (1) is columnar, the pole (1) is provided with a flange, and the protruding part (6) is bent inwards to fix the upper surface of the flange of the pole (1).

4. A top cover according to claim 3, wherein: the flange is an annular member.

5. A top cover according to claim 3, wherein: the flange comprises a plurality of sector elements arranged along the circumference of the pole (1).

6. A top cover according to claim 3, wherein: the device also comprises a sealing element (2), wherein the sealing element (2) is arranged in the accommodating space (5) and fills a gap between the pole (1) and the accommodating space (5).

7. The overcap of claim 6, wherein: the inner wall of the accommodating space (5) is provided with a matching part (8), the matching part (8) extends to a preset distance in the axis direction of the pole (1), and the matching part (8) is clamped with the sealing element (2).

8. The overcap of claim 7, wherein: the sealing element (2) comprises a body (22) and a first convex ring (21) arranged on the first end face of the body (22) in the axial direction, the first convex ring (21) and the body (22) are coaxially arranged, and the outer diameter of the first convex ring (21) is smaller than the outer diameter of the body (22).

9. The overcap of claim 8, wherein: the sealing element (2) further comprises a second convex ring (23), the second convex ring (23) is arranged on the second end face of the body (22) in the axial direction, the second convex ring (23) is coaxially arranged with the first convex ring (21) and the body (22), and the outer diameter of the second convex ring (23) is smaller than the outer diameter of the body (22).

10. A battery, characterized in that: comprising the following steps:

a housing having an open end;

the battery cell is accommodated in the shell; and

the top cover according to any one of claims 1-9, which is arranged at the open end of the housing, the side of the top cover provided with the projection (6) being arranged away from the interior of the housing.

11. An electrical device, characterized in that: comprising a battery as claimed in claim 10.