CN215869576U

CN215869576U - Battery cover plate assembly and battery

Info

Publication number: CN215869576U
Application number: CN202121188012.3U
Authority: CN
Inventors: 齐彬伟; 徐雨; 周勇; 许久凌
Original assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Lithium Battery Technology Co Ltd
Current assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Lithium Battery Technology Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-02-18
Anticipated expiration: 2031-05-31

Abstract

The embodiment of the utility model discloses a battery cover plate component and a battery, wherein the battery cover plate component comprises: apron body, utmost point post and adaptor. Utmost point post is connected in the apron body, and includes utmost point post body and locates the connecting plate of utmost point post body one side, and the connecting plate has the first bottom surface that carries on the back mutually with utmost point post body. The adaptor has a second bottom surface opposite to the pole body. A welding structure exposed to the first bottom surface and the second bottom surface is formed between the adapter and the connecting plate. On one hand, the welding structure of the embodiment of the utility model has larger space at the position and is more convenient to operate; on the other hand, if the welding structure is a closed welding seam, an operator moves the welding equipment for a short stroke below the first bottom surface and the second bottom surface to form the welding seam, and the welding efficiency is higher.

Description

Battery cover plate assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cover plate assembly and a battery.

Background

In the assembly process of the battery cover plate component, the pole and the adapter are required to be welded so as to realize the electric connection between the battery core and the pole. However, the battery cover plate assembly in the related art has a problem that welding is inconvenient because the welding area of the pole and the adaptor is located at the side.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a battery cover plate component convenient to weld and a battery.

The battery cover plate assembly of the embodiment of the utility model comprises: apron body, utmost point post and adaptor. The pole is connected with the cover plate body and comprises a pole body and a connecting plate arranged on one side of the pole body, and the connecting plate is provided with a first bottom surface opposite to the pole body; the adaptor is provided with a second bottom surface opposite to the pole body; a welding structure exposed to the first bottom surface and the second bottom surface is formed between the adapter and the connecting plate.

The battery of the embodiment of the utility model comprises the battery cover plate component.

An embodiment in the above-mentioned utility model has following advantage or beneficial effect:

according to the battery cover plate assembly provided by the embodiment of the utility model, as the welding structure exposed to the first bottom surface and the second bottom surface is formed between the adapter and the connecting plate, when the adapter and the connecting plate are welded, an operator can arrange welding equipment in the areas of the first bottom surface of the connecting plate and the second bottom surface of the adapter for welding. Compared with the scheme in the related art, on one hand, the position of the welding structure has larger space, and the operation is more convenient; on the other hand, if the welding structure is a closed welding seam, an operator moves the welding equipment for a short stroke below the first bottom surface and the second bottom surface to form the welding seam, and the welding efficiency is higher.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present invention.

Fig. 2 shows a cross-sectional view a-a in fig. 1.

Fig. 3 shows a partial enlarged view at J in fig. 2.

Fig. 4 is an exploded view of a battery cover plate assembly according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a pole according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of an adaptor according to an embodiment of the present invention.

FIG. 7 illustrates an example schematic view of a first and second orthographic projection areas of a seal and weld configuration on a cover plate body.

Wherein the reference numerals are as follows:

100. cover plate body

110. Perforation

120. First orthographic projection area

130. Second orthographic projection area

200. Pole post

210. Pole column body

220. Connecting plate

221. First bottom surface

300. Adapter

310. Second bottom surface

400. Welding structure

500. Limiting structure

510. First step structure

511. First step surface

520. Second step structure

521. Second step surface

610. Sealing element

620. First insulating member

630. Second insulating member

700. Terminal with a terminal body

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1, 2 and 4, fig. 1 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present invention. Fig. 2 shows a cross-sectional view a-a in fig. 1. Fig. 4 is an exploded view of a battery cover plate assembly according to an embodiment of the present invention. The battery cover plate assembly of the embodiment of the utility model comprises a cover plate body 100, a pole 200 and an adapter 300. The post 200 is connected to the cap body 100, and includes a post body 210 and a connecting plate 220 disposed on one side of the post body 210, wherein the connecting plate 220 has a first bottom surface 221 opposite to the post body 210. The adapter 300 has a second bottom surface 310 opposite the post body 210. A welding structure 400 exposed to the first bottom surface 221 and the second bottom surface 310 is formed between the adaptor 300 and the connection plate 220.

In the battery cover plate assembly according to the embodiment of the present invention, since the welding structure 400 exposed to the first bottom surface 221 and the second bottom surface 310 is formed between the adaptor 300 and the connection plate 220, when the adaptor 300 and the connection plate 220 are welded, an operator may set a welding device in the area of the first bottom surface 221 of the connection plate 220 and the second bottom surface 310 of the adaptor 300 to weld. Compared with the scheme in the related art, on one hand, the welding structure 400 of the embodiment of the utility model has a larger space at the position, and is more convenient to operate; on the other hand, if the welding structure 400 is a closed welding seam, the operator moves the welding device under the first bottom surface 221 and the second bottom surface 310 for a short stroke to form the welding seam, and the welding efficiency is higher.

The welding structure 400 may be a butt weld, which may be formed by laser welding, but is not limited thereto. The butt welding seam is adopted, so that welding can be conveniently carried out, the quality of the welding seam can be ensured, the connection quality between the adapter piece 300 and the connecting plate 220 is ensured, and the influence of virtual connection on the electric connection effect is avoided.

Further, the butt weld may be annular, but the utility model is not limited thereto. It will be appreciated that the particular shape of the butt weld may depend on the shape of the junction of the adapter 300 and the connection plate 220. For example, the butt weld may also be rectangular, oval, or other regular or irregular shapes.

With continued reference to fig. 1, 2, and 4, the first bottom surface 221 of the connection plate 220 is flush with the second bottom surface 310 of the interposer 300. Thus, after the adaptor 300 is connected to the connection plate 220 by welding, the first bottom surface 221 and the second bottom surface 310 may form a plane. After the battery cover plate assembly is connected to the casing of the battery, since the first bottom surface 221 and the second bottom surface 310 are flat surfaces, when the battery is moved, the flat surfaces do not damage the battery core located in the casing. In addition, when it is necessary to attach the insulating films to the first and second bottom surfaces 221 and 310, the flat surface can also ensure the firmness of the attachment of the insulating films.

Of course, it should be noted that the above-mentioned "flush" is not an absolute flush. An embodiment in which the first bottom surface 221 and the second bottom surface 310 are offset by a predetermined distance in the thickness direction of the cover body 100 according to a machining error or an assembly error is also within the scope of the present invention.

As shown in fig. 2 and 4, the battery cover plate assembly further includes a first insulating member 620 and a second insulating member 630. The first insulator 620 is disposed between the adaptor 300 and the cap body 100 to prevent electrical connection of the adaptor 300 and the cap body 100. The second insulating member 630 is disposed between the cap body 100 and the terminal 700 to prevent an electrical connection between the cap body 100 and the terminal 700.

As shown in fig. 1, 2 and 3, fig. 3 is a partially enlarged view at J in fig. 2. A limiting structure 500 is further provided between the connecting plate 220 and the adaptor 300. When the pole 200 and the cover body 100 are mounted, for example by riveting, the connection plate 220 can define the position of the adaptor 300 by means of the limiting structure 500.

In the related art, the spacing structure 500 is not present between the connection plate 220 and the adapter 300, and when the connection plate 220 and the adapter 300 are welded, in order to ensure that the first bottom surface 221 of the connection plate 220 and the second bottom surface 310 of the adapter 300 are flush after welding, a clamping tool is required in the related art to clamp the adapter 300 so as to ensure the relative position of the adapter 300 and the connection plate 220. Because the clamping tool may shake during the welding process, the limiting effect cannot be well guaranteed, and the operation is inconvenient.

In the embodiment of the utility model, the limiting structure 500 is arranged between the connecting plate 220 and the adapter 300, so that when the pole 200 and the cover plate body 100 are installed, the limiting effect can be realized, a clamping tool is omitted, and the limiting effect can be ensured. In addition, if the connection plate 220 and the adapter 300 are not welded well, the limiting structure 500 can prevent the adapter 300 from falling off.

As shown in fig. 3, 5 and 6, fig. 5 is a schematic structural diagram of a pole according to an embodiment of the present invention. Fig. 6 is a schematic structural diagram of an adaptor according to an embodiment of the present invention. The spacing structure 500 may include a first step structure 510 and a second step structure 520 that mate. The first step 510 is disposed on the connecting plate 220, and the second step 520 is disposed on the adaptor 300. The first step structure 510 is supported by the second step structure 520.

Specifically, before the pole 200 is mounted on the cap body 100, the connection plate 220 and the adaptor 300 are engaged with each other by the first step structure 510 and the second step structure 520, and the engaged connection plate 220 and the adaptor 300 are moved together toward the cap body 100. After the terminal post 200 is connected to the cover plate body 100, the first stepped structure 510 is supported by the second stepped structure 520, and the top surface of the adaptor 300 opposite to the second bottom surface 310 is abutted to the first insulating member 620. In this way, the adaptor 300 is limited, and the adaptor 300 is prevented from moving in the thickness direction of the cap body 100 relative to the connection plate 220 during welding.

The welded structure 400 is formed between the first step surface 511 of the first step structure 510 and the second step surface 521 of the second step structure 520. Wherein the first step surface 511 and the second step surface 521 are disposed opposite to each other.

As shown in fig. 1, 2 and 7, fig. 7 is an exemplary schematic view of a first and a second orthographic projection area of a seal and weld feature on a cover plate body. The battery cover plate assembly further includes a sealing member 610, and the sealing member 610 is sealed between the cover plate body 100 and the pole post 200. An orthographic projection of the weld structure 400 on the cap body 100 is offset from an orthographic projection of the seal 610 on the cap body 100.

By staggering the two orthographic projections, the performance of the sealing element 610 can be prevented from being affected by high temperature generated when the connecting plate 220 and the adapter 300 are welded. In addition, in the related art, in order to reduce the heat transfer to the region where the sealing member 610 is located during welding, a convex structure is generally provided on the first bottom surface 221 of the connection plate 220. In the embodiment, since the two orthographic projections are arranged in a staggered manner, the protrusion can be omitted, so that the first bottom surface 221 is a plane, thereby reducing the height of the pole 200 and further improving the capacity density of the battery.

The cover plate body 100 has a through hole 110, and the pole body 210 is disposed through the through hole 110. The sealing member 610 is a sealing ring, which is sleeved on the post body 210 and clamped between the outer peripheral wall of the post body 210 and the hole wall of the through hole 110.

As shown in fig. 7, the weld structure 400 is an annular butt weld, and the first orthographic projection area 120 of the seal 610 on the cover plate body 100 is located within the second orthographic projection area 130 of the weld structure 400 on the cover plate body 100. Therefore, the circumference of the butt welding seam is longer, and the welding overcurrent capacity of the adaptor 300 and the pole 200 is ensured.

Further, referring to fig. 7, the distance D between the outer periphery of the second orthographic projection area 130 and the outer periphery of the first orthographic projection area 120 is greater than or equal to 0.1mm, so as to separate the welding structure 400 from the sealing element 610, thereby better achieving the effect of preventing the high-temperature heat from responding to the performance of the sealing element 610.

In another aspect of the present invention, there is also provided a battery including: casing, electric core and any one above-mentioned battery cover plate subassembly. The electric core is arranged in the shell. The battery cover plate assembly covers the shell to seal the battery core in a containing cavity formed by the shell and the battery cover plate assembly.

The battery of the embodiment of the utility model has all the advantages and beneficial effects of any embodiment described above due to the battery cover plate assembly of any embodiment described above, and further description is omitted here.

It is understood that the battery mentioned in the embodiment of the present invention may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, and the embodiment of the present invention is not limited thereto. The battery may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in the embodiments of the present invention.

The battery cell can include a positive plate, a negative plate and a separation film. The positive plate comprises a positive substrate and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive substrate, the positive substrate which is not coated with the positive active substance layer protrudes out of the positive substrate which is coated with the positive active substance layer, and the positive substrate which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode substrate may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium manganese oxide, or the like. The negative plate comprises a negative substrate and a negative active material layer, the negative active material layer is coated on the surface of the negative substrate, the negative substrate which is not coated with the negative active material layer protrudes out of the negative substrate which is coated with the negative active material layer, and the negative substrate which is not coated with the negative active material layer is used as a negative electrode tab. The material of the negative electrode substrate may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film can be PP or PE, etc.

In addition, the battery cell may have a winding structure or a laminated structure, and the embodiment of the present invention is not limited thereto.

In another aspect of the present invention, a battery pack is further provided, which includes a box body and a plurality of batteries as described above, and the plurality of batteries are disposed in the box body.

The battery pack according to the embodiment of the present invention includes the battery according to any of the above embodiments, so that all the advantages and benefits of any of the above embodiments are provided, and further description is omitted here.

It is understood that the battery pack of the embodiment of the present invention can be applied to various devices using a battery, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, spacecraft, electric toys, electric tools, and the like. Spacecraft may include aircraft, rockets, space shuttles, and spacecraft, among others. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like. The power tools may include metal cutting power tools, grinding power tools, assembly power tools, and power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers.

The battery pack may further include a bus bar for achieving electrical connection between the plurality of batteries, for example, in parallel or in series-parallel. Specifically, the bus bar may achieve electrical connection between the batteries by connecting the terminals 700 of the batteries. The bus bar may be fixed to the terminal 700 of the battery by welding.

The number of batteries may be set to any number according to different power requirements. Multiple batteries may be connected in series, parallel, or series-parallel to achieve greater capacity or power.

In summary, the battery cover plate assembly, the battery and the battery pack of the embodiment of the utility model have the advantages and beneficial effects that:

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.

Claims

1. A battery cover plate assembly, comprising:

a cover body (100);

the pole post (200) is connected to the cover plate body (100) and comprises a pole post body (210) and a connecting plate (220) arranged on one side of the pole post body (210), and the connecting plate (220) is provided with a first bottom surface (221) opposite to the pole post body (210); and

an adaptor (300) having a second bottom surface (310) opposite the post body (210); a welding structure (400) exposed to the first bottom surface (221) and the second bottom surface (310) is formed between the adapter (300) and the connecting plate (220).

2. The battery cover plate assembly of claim 1, wherein the welding structure (400) is a butt weld; or the like, or, alternatively,

the first bottom surface (221) and the second bottom surface (310) are flush.

3. The battery cover plate assembly according to claim 1, wherein a limiting structure (500) is further provided between the connecting plate (220) and the adapter (300);

when the pole (200) and the cover plate body (100) are installed, the connecting plate (220) can limit the position of the adapter (300) through the limiting structure (500).

4. The battery cover plate assembly of claim 3, wherein the retention structure (500) comprises mating first and second step structures (510, 520);

the first step structure (510) is arranged on the connecting plate (220), and the second step structure (520) is arranged on the adapter (300);

wherein the first step structure (510) bears against the second step structure (520).

5. The battery cover plate assembly of claim 4, wherein the welding structure (400) is formed between a first step face (511) of the first step structure (510) and a second step face (521) of the second step structure (520);

wherein the first step surface (511) and the second step surface (521) are disposed opposite to each other.

6. The battery cover plate assembly of claim 1, further comprising a seal (610), the seal (610) being sealed between the cover plate body (100) and the pole post (200);

the orthographic projection of the welding structure (400) on the cover plate body (100) is staggered with the orthographic projection of the sealing element (610) on the cover plate body (100).

7. The battery cover plate assembly according to claim 6, wherein the cover plate body (100) has a through hole (110), the pole body (210) is arranged through the through hole (110);

the sealing element (610) is a sealing ring, is sleeved on the pole body (210), and is clamped between the peripheral wall of the pole body (210) and the hole wall of the through hole (110).

8. The battery cover plate assembly of claim 7, wherein the welding structure (400) is an annular structure;

a first orthographic projection area of the seal (610) on the cover plate body (100) is located within a second orthographic projection area of the weld structure (400) on the cover plate body (100).

9. The battery cover plate assembly of claim 8, wherein a distance between an outer perimeter of the second orthographic projection area and an outer perimeter of the first orthographic projection area is greater than or equal to 0.1 mm.

10. A battery comprising a battery cover plate assembly according to any one of claims 1 to 9.